I got my tires on the rims today and here's a pick beside my MT 305-35's

Its narrower and taller, I'm not sure how much the extra height will effect gearing.

http://i580.photobucket.com/albums/ss248/blackmax2009/004-25.jpg

That might skew all your results. Is that a 28" tire and what rear gears do you have?

Yup , its a 28 inch and I have 373's.

What kind of 60's were you getting with the old tires?

Best was 1.9 but mostly 2, I could never hook so after talking to a couple of people these tires were recomended. Good news is I have another 20 + h.p. and more torque now. So what do you figure ?

BJ's probably a better source for an educated guess... but with that said, it depends on your driving style and how you have your car setup. I've found I can get 1.9's on anything with an off-idle launch. 1.9's on M/T tells me you might be hitting the clutch pedal too hard. (Not trying to be critical, trying to help you)
I don't know anything about your combo so forgive me if I'm off-track. 60' times depend on so many factors, but driver style and clutch management have a lot to do with it. You might find it easier to 60 foot just due to the larger diameter tire. Some guys, when they go to a higher numerical gear ratio, find wheelspin becomes more of an issue. You will be going the other way with the larger tires, so that might help. But it also might change your optimum shift points and also change your MPH results. Best thing to do is experiment. If you had been charting results on the old tires (launch RPM and shift points) you could compare that data to the new tires and those results.

If you find your 60's aren't getting better on those tires, try some changes in your technique with regard to how you release the clutch and how you press the go-pedal as these two cross each other during the pedal dance...

BJ's probably a better source for an educated guess... but with that said, it depends on your driving style and how you have your car setup. I've found I can get 1.9's on anything with an off-idle launch. 1.9's on M/T tells me you might be hitting the clutch pedal too hard. (Not trying to be critical, trying to help you)
I don't know anything about your combo so forgive me if I'm off-track. 60' times depend on so many factors, but driver style and clutch management have a lot to do with it. You might find it easier to 60 foot just due to the larger diameter tire. Some guys, when they go to a higher numerical gear ratio, find wheelspin becomes more of an issue. You will be going the other way with the larger tires, so that might help. But it also might change your optimum shift points and also change your MPH results. Best thing to do is experiment. If you had been charting results on the old tires (launch RPM and shift points) you could compare that data to the new tires and those results.

If you find your 60's aren't getting better on those tires, try some changes in your technique with regard to how you release the clutch and how you press the go-pedal as these two cross each other during the pedal dance...


http://www.hotrodpitstop.com/tools.html#12

His effective new ratio is 3.53. OK, Max....here are some thing to thing about.

1. The taller tire will slow your 60' and reduce your trap speeds, all things being completely equal (power, launch rpm, etc)

2. You will need to launch harder and at a higher rpm to make up for it. You'll be able to do so with the increased traction.

3. Start with about 15psi if you have good prep. Don't go below 12, ever.
I'd go 15 and launch at 4,000 with a VERY fast clutch release and trade it for power. If you don't spin, increase your launch rpm by 500. See if it hooks there. If it spins, drop your psi down by 2 and try again. Ultimately, you're looking for whatever rpm your can use that will let you launch at as high of psi as possible so as to decrease rolling resistance.

4. Air up your front tires to 45psi to reduce rolling resistance.

5. Remove your front sway bar so you can get weight transfer when the front rises.

6. Stage S H A L L O W!!!!!! Just flicker the lights. That will give you more room to get moving before you trip the timing light.

Those tires will hook much better than what you're used to, so be prepared for a different feeling. The narrower tire will reduce rolling resistance. That's a good thing. When I first went with 325/50/15s my mph dropped by 4 and my 60' went up nearly a full 10th.

Harder launches made up for the 60' and a little more aggressive tuning brought back the mph.

Just my opinion, but I think 4.10s are the ONLY way to go. The 28's drop them down to 3.95 and I end the run at 6300 rpm in 4th.

Greg is exactly right. Experiment and keep a log of what you do and the effect each variable has.

You're gonna LOVE those tires once you get used to them.


bj

Thanks for all the info, I think its good to have a couple of sets of different size D.R.'s anyway.(not that I have deep pockets) I will be able to experiment with both with different track preps etc.

If you remember I told you about the GT500 here that went to slicks and snapped the axles. Well they got it back together and next run the lower control arm snapped and went through one of the slicks! crappy luck.

If you remember I told you about the GT500 here that went to slicks and snapped the axles. Well they got it back together and next run the lower control arm snapped and went through one of the slicks! crappy luck.

Crappy luck or.... clutch dumper???

Crappy luck or.... clutch dumper???

Driver mod needed.

I have a funny feeling I'm about to experience some busted stuff.

I hear a tick-tick-tick. Not the motor, the "clock" that's winding down to "boom".


:mecry:

bj

Driver mod needed.

I have a funny feeling I'm about to experience some busted stuff.

I hear a tick-tick-tick. Not the motor, the "clock" that's winding down to "boom".


:mecry:

bj

My kid is sending me updates from the tower. BJ I'm speechless. You've out done yourself. Holy crap!!!! :king:

My kid is sending me updates from the tower. BJ I'm speechless. You've out done yourself. Holy crap!!!! :king:

DETAILS!!

WE NEED DETAILS!!


:mofo::mofo:

My kid is sending me updates from the tower. BJ I'm speechless. You've out done yourself. Holy crap!!!! :king:

I was coming down the return road and heard him call me by name and I thought I was in trouble but he said something about Greg....so I went up and hung out for a while.

Made 4 passes. Some had oiled it down before I got there, then while I was changing tires a Fox stood it on the bumper, flopped and then stood it up and flopped again. Oil pan, trans pan, k-member and a lot more. So, it was greased up again. My first pass broke loose and I peddled it down. Pass two was the quick one. Just for Joe, here are the details:

60' 1.539
330 4.512
1/8 6.95
MPH 100.78
1000 9.05
1/4 10.813
MPH 131.25

Did 2 more but it was getting late and the surface getting run off. Nobody could hook anymore. They were low 11s at low mph because of the slipping and sliding. I'll take my .81 and be happy with it.

Nice night. DA was just about equal with track elevation.

Thanks for the kudos, Greg.


bj

I was coming down the return road and heard him call me by name and I thought I was in trouble but he said something about Greg....so I went up and hung out for a while.

Made 4 passes. Some had oiled it down before I got there, then while I was changing tires a Fox stood it on the bumper, flopped and then stood it up and flopped again. Oil pan, trans pan, k-member and a lot more. So, it was greased up again. My first pass broke loose and I peddled it down. Pass two was the quick one. Just for Joe, here are the details:

60' 1.539
330 4.512
1/8 6.95
MPH 100.78
1000 9.05
1/4 10.813
MPH 131.25

Did 2 more but it was getting late and the surface getting run off. Nobody could hook anymore. They were low 11s at low mph because of the slipping and sliding. I'll take my .81 and be happy with it.

Nice night. DA was just about equal with track elevation.

Thanks for the kudos, Greg.


bj

They are deserved. 1.5's with that heavy of a car on a DR is getting it done BJ. :pimp:
I'm glad though in hindsight that I decided to just stay home and watch football with Missie. The traffic on the southbound side was a freeking mess well into the early evening and I would have been looking at an hour and a half drive to get there.
Night racing at this time of year starts to get a little dicey at GLD. The dew starts to form on your roof right after sundown and the track tends to go away.

Congrats on the great results. :pinklove:

They are deserved. 1.5's with that heavy of a car on a DR is getting it done BJ. :pimp:
I'm glad though in hindsight that I decided to just stay home and watch football with Missie. The traffic on the southbound side was a freeking mess well into the early evening and I would have been looking at an hour and a half drive to get there.
Night racing at this time of year starts to get a little dicey at GLD. The dew starts to form on your roof right after sundown and the track tends to go away.

Congrats on the great results. :pinklove:

Thanks man. Yeah I saw that SB traffic on the GPS. What a mess. The track was killer for about 45 min. Some guy in a Fox stood it on the bumper, dropped it down with a crash and I'll be damned if he didn't do it again. It was hair triggered like a funny. He caught me at the BP on 50 and was asking about my car, then he said what he was driving (I guess someone else was driving the trailer rig). Some guys in an EVO with 4 wheel slicks ripped off a pair of .80s back to back!!! Damn those things can be fast and with all-wheel they're so consistant.

Missed ya there, but we'll hook up soon. You should come over to Byron on the 18th for the Chicagoland Mustang day (dedicated lanes so a LITTLE less waiting).

bj

Byron is a long way from me, plus I have to pay to race there... :silly:

Byron is a long way from me, plus I have to pay to race there... :silly:

You make the trip, I'll get you in!

bj

Great run BJ. I wanna grow up to be just like you....minus the avatar. :rofl:

All kidding aside, how do you guys get away with running those numbers and not have a roll bar or a scatter shield? We are not as lucky here in the Pacific Northwest as our tracks are all over our cars in tech.

Great run BJ. I wanna grow up to be just like you....minus the avatar. :rofl:

All kidding aside, how do you guys get away with running those numbers and not have a roll bar or a scatter shield? We are not as lucky here in the Pacific Northwest as our tracks are all over our cars in tech.

You just have to look closely for the rollbar. And the shield....that's an easy one.

bj

BJ do you drive to the track with the DRs on the car? how far of a drive is it? do you have a pit crew? what kind of prep do you do to the car besides tire pressure? how long do you wait between runs? i could go on but i think that is enough questions for one post. thanks in advance.

BJ do you drive to the track with the DRs on the car? how far of a drive is it? do you have a pit crew? what kind of prep do you do to the car besides tire pressure? how long do you wait between runs? i could go on but i think that is enough questions for one post. thanks in advance.

1. Yes. I change the fronts when I get there. Can't drive on them. (Not the ones in the sig pic)

2. Yes. A grumpy old bald fart that also drives for me.

3. Tech in. Buy 3 gallons of race fuel. Go pee. Tire swap, H/E pump and fan on, adjust my V M P TUNING race files for track and weather. Set the struts up for conditions. Go pee. Remove the 40 pound floor jack from my trunk. Take my wallet out of my pocket (I know, but WTF, it makes me feel better). Go pee. Starting tire pressures set. Go pee.

4. It's about :45 to an hour by the time I get everything ready to go and by that time the car has cooled sufficiently.

5. Depending on how the first pass goes, I MAY hotlap it once. Otherwise, about :45 minutes between passes with the fan and fluids pumping. And those are just mine. The car's fans and fluids pump, too.

6. 3-4 passes in a night. Go pee.

Hope this helps. I used to do this a lot quicker before I got into my 50s.


bj

You just have to look closely for the rollbar. And the shield....that's an easy one.

bj

Ah, okay. I didn't know you had a rollbar. Scattershield is an easy one here as none of the tech guys like to crawl under the car to check.... :)

the HE pump and fan, how do they work? external hook up? also can you tell me what octane the racing fuel is and how many gallons of 93 do you mix with the 3 gallons of racing fuel. i am thinking you might want to consider writing a " how to drag race for dummies " and before anyone gets there panties in a bunch i was referring myself.. rest assured i am keeping a record of all the tips and i too will see the 10s someday. it's on my bucket list.

Good questions, I would like some info on the roll bar. If you have time would you mind telling us how you went about getting it installed? Also how much of the car was cut up putting it in? Thanks B.J. Oh, and the shield?

bj's rollbar is a special design. You need magic glasses to be able to see it...

http://t3.gstatic.com/images?q=tbn:ANd9GcRV5VPEvQ9VYpRrOsQ9INjfvE_v8A6VR 3-ZsyZQRV8Nffbsu3o&t=1&usg=__deOoBCxNVVhoNm2uCWNwZYhV8c0=

Awesome!

Hey....Jiggy (with the white GT500) got the infraction on tape the other night. Here 'tis:

http://www.youtube.com/watch?v=ry2g1u23wzE

If you look really closely you can see the roll bar.


BJ

i was looking for numbers. nice shifts.

i was looking for numbers. nice shifts.

I run with clocks off if I'm just doing timed runs (for obvious reasons).

I'll run with them on someday when it's time to leave for the day.

bj

and you leave the time off because? i think i know why. does money have anything to do with it? sometime the obvious escapes me. i am really bad at checkers.

and you leave the time off because? i think i know why. does money have anything to do with it? sometime the obvious escapes me. i am really bad at checkers.

I believe it's because if you run too fast, without the required equipment for that speed, they'll boot you from the track.

i thought you still got a time slip......

I believe it's because if you run too fast, without the required equipment for that speed, they'll boot you from the track.

This.

And it's pretty easy for someone from a sanctioning body to match up a vid or pic and a timeslip. Especially when the name of the track is on top :)

Anyway, the critical info is:

1.53 60'
6.95/100.78 in the 1/8
10.81@131

Glad I had the roll bar installed.

bj

This.

bj

http://www.spokentorque.com/forums/images/smilies/xsmart.gif

http://www.spokentorque.com/forums/images/smilies/xsmart.gif

As my grandmother used to say...."You're a fart little smucker, aren't you?"

Then she beat me with a switch from a sycamore tree.

bj

Then she beat me with a switch from a sycamore tree.

bj

That explains SOOOOO much now. :thinkerg:





:silly:

AHHH the abused childhood. that explains so much. i was abused also my father was a jewish comedian.

She quit when I stopped paying her to do it.

What I would like to know is , what the hell is it like stopping from almost 132 m.p.h. at the end of the track? Check your brakes lately ?

Do we need any safety measures added when the car is pretty stock??

Do we need any safety measures added when the car is pretty stock??

I went out and got drive shaft loops once I was hitting 120 m.p.h. Can you imagine a drive shaft banging off the bottom of your car at even half that speed ? Would not be pretty.

What I would like to know is , what the hell is it like stopping from almost 132 m.p.h. at the end of the track? Check your brakes lately ?


I use Hawk Hi Performance ceramic pads all the way around. I have the FRPP brake cooling kit going to the fronts. The wheels get so hot you can't touch them after a pass or two. Lots of fun when it's time to lose the skinnies for the ride back home. Gloves, baby!

bj

Do we need any safety measures added when the car is pretty stock??

You can download the latest regs at NHRA.COM. Better yet, become a member.
In the meantime, here's a good article with a quick peek at your question:

http://www.hotrod.com/techarticles/nhra_legal_rules_regulations_time_brackets/index.html

bj

the HE pump and fan, how do they work? external hook up? also can you tell me what octane the racing fuel is and how many gallons of 93 do you mix with the 3 gallons of racing fuel. i am thinking you might want to consider writing a " how to drag race for dummies " and before anyone gets there panties in a bunch i was referring myself.. rest assured i am keeping a record of all the tips and i too will see the 10s someday. it's on my bucket list.

Bj class is in session could you answer these questions please.

Thank you BJ that was really helpful. Was hoping to hit the track soon now that it is cooling down a bit. Thought I might need a driveshaft loop, looks like I got some work to do over the weekend.

You guys have any suggestions on a driveshaft loop. Hoping to find something I can do on my own. Would rather not have to drill, but if I must so be it.

You guys have any suggestions on a driveshaft loop. Hoping to find something I can do on my own. Would rather not have to drill, but if I must so be it.

What flavor you looking for? :lol:


Ford Racing - http://store.bvmperformance.com/M_5478_S197B_DRIVESHAFT_LOOP_KIT_p/m-5478-s197b.htm

Metco - http://store.bvmperformance.com/MDL2005_Metco_Driveshaft_loops_p/mdl2005%20metco%20driveshaft%20loops.htm

(the Metco is also available as just the front or just the back if you don't want both)

I have the Metco's and they installed easy and are a quality piece. The Fords do look lighter.

Bj class is in session could you answer these questions please.

You're welcome.

Thx Joe G, the metco one is more like what I was looking for. I found this other one on Lethal Performance. What do you guys think? There is no drilling involved, plus I don't need to take off the driveshaft, but its pretty bulky looking.

http://www.lethalperformance.com/07-09-shelby-gt500-driveline-driveshaft-loops-c-2052_2147_2845/steeda-05-10-mustang-1-piece-driveshaft-safety-loop-p-30316

bump Opinions?

Thx Joe G, the metco one is more like what I was looking for. I found this other one on Lethal Performance. What do you guys think? There is no drilling involved, plus I don't need to take off the driveshaft, but its pretty bulky looking.

http://www.lethalperformance.com/07-09-shelby-gt500-driveline-driveshaft-loops-c-2052_2147_2845/steeda-05-10-mustang-1-piece-driveshaft-safety-loop-p-30316

Jesus, that thing looks like it fell off Tiny Tim's leg!

Buy the BMR.

bj

lol thx BJ, I was leaning that way

So I got a chance to put on the M&H DR's for some Street Legal action at the track last night. Car felt heavy coming off the line and my 60 ft. was back to 1.9 from 1.8. I tried some hard 4000 r.p.m. launches and did hook o.k. but then spun 2nd enough to scrub off time. These are a 4.10 gear diameter for sure unless you have an extra 100 h.p. I guess. I also found them squirlly at high speed near the end of the run. Even on the street at 60 m.p.h. the back end of the car felt funny. My best run was with 17 lbs in them and when I lowered to 15.5 lbs is when the car started acting strange.Overall they do hook up better than the M.T.'s and I will buy them again once I figure which way to go.

I don't know if I should switch to 4.10's or buy smaller rims and run the smaller diameter tires.

Jesus, that thing looks like it fell off Tiny Tim's leg!

Buy the BMR.

bj

I read your post and went "WTH??" Then I looked at the part. :rofl:

So I got a chance to put on the M&H DR's for some Street Legal action at the track last night. Car felt heavy coming off the line and my 60 ft. was back to 1.9 from 1.8. I tried some hard 4000 r.p.m. launches and did hook o.k. but then spun 2nd enough to scrub off time. These are a 4.10 gear diameter for sure unless you have an extra 100 h.p. I guess. I also found them squirlly at high speed near the end of the run. Even on the street at 60 m.p.h. the back end of the car felt funny. My best run was with 17 lbs in them and when I lowered to 15.5 lbs is when the car started acting strange.Overall they do hook up better than the M.T.'s and I will buy them again once I figure which way to go.

I don't know if I should switch to 4.10's or buy smaller rims and run the smaller diameter tires.

The gears are cheaper. Are you still on 3.31 or did you go 3.73?

Either way. the extra 1.5" will raise your gearing (3.25 or 3.60-ish, respectively). 28's drop 4.10s down to the mid 3.90s which is absolutely perfect for the quarter......6300rpm in 4th at the end.

They'll feel taller and softer....like your springs are softer...and yes, the taller sidewall will allow more lateral flex. Yes, the lower the pressure, the more flex and the more "strange" it will feel. Throw a set of regular sidewall slicks on there someday and really be prepared for a bizarre feel.

Buying a smaller wheel is great. Buying a shorter tire isn't. The smaller wheel lets you have more sidewall and you'll have more squirreliness.
The smaller tire will bring you back down to your standard gearing, but it won't help you whittle down your 60's.

Only reason I was even thinking about them was because they were about $50 cheaper, but visually they would of killed me to put on. Even if it was under the car, I would of been self consious if someone looked under it lol

oh and I bought the Metco loops, they are on there way.

The gears are cheaper. Are you still on 3.31 or did you go 3.73?

Either way. the extra 1.5" will raise your gearing (3.25 or 3.60-ish, respectively). 28's drop 4.10s down to the mid 3.90s which is absolutely perfect for the quarter......6300rpm in 4th at the end.

They'll feel taller and softer....like your springs are softer...and yes, the taller sidewall will allow more lateral flex. Yes, the lower the pressure, the more flex and the more "strange" it will feel. Throw a set of regular sidewall slicks on there someday and really be prepared for a bizarre feel.

Buying a smaller wheel is great. Buying a shorter tire isn't. The smaller wheel lets you have more sidewall and you'll have more squirreliness.
The smaller tire will bring you back down to your standard gearing, but it won't help you whittle down your 60's.






Crap, i just spent $1000.00 for the 373's. lol I'm sure I'm not the first or the last to find out the hard way about proper gearing. I know i'll end up with the 410's and the Bogart wheels you have. Now I need to sell off the other wheels.

Crap, i just spent $1000.00 for the 373's. lol I'm sure I'm not the first or the last to find out the hard way about proper gearing. I know i'll end up with the 410's and the Bogart wheels you have. Now I need to sell off the other wheels.

Been there, done that, got the t-shirt. I've spent more dough learning what works than you can freaking imagine. And there was no one to do it first for me since my car was built in June of 2006. I was R&D for a lot of people.
That's my story and I'm stickin' to it. (Some really was R&D, the rest I just chalked it up to that because I did give the manufacturers feedback )

It's all a matter of calculators, track time and lots of noodling about what exactly I was wanting the end result to be.

Couldn't be happier with where I'm at. Way the hell fast, daily driver a possibility, 19mph at 70 and 60' times that are tough for me to duplicate.

Christine does the work. I just feed her and keep her happy.

bj

oh and I bought the Metco loops, they are on there way.

Thanks for the order. :)

I read your post and went "WTH??" Then I looked at the part. :rofl:


Leave it to freakin Steeda

bj