dfw

**Grandpa** · 08-19-2013, 11:28 AM

Originally Posted by 46Tbird

Most modern tires recommend 35-45psi for fuel economy and there is NO WAY you're going to be able to hook up on a rock hard 40-series tire with ~400hp and a stick. There is a difference between "take some air out" and "take it down to the air pressure you run in a slick." Most of these guys would get a better launch at ~25psi than they will at 40.

*edit, treed by junkie

The idea is to remove the air pressure enough to make as much of the tire as possible contact the pavement. The compound of the tire with how soft/hard it is will create the traction with heat from the burnout. I'm with you there on all of that.

A tire like an Invo that is a real performance tire being a softer compound will benefit from a good burnout. Also, being an aftermarket tire is most likely a larger tire as well. I can definitely see what you are saying applying to that.

I just don't see it applying as well to someone on a stock 235 Pirelli that is a harder compound designed for all seasons and the side wall is not meant to give at all.

I also agree with you that some people let out way too much air on a street radial thinking they are getting the same effect as they would on a slick. The same could be said for a overly inflated tire.

Originally Posted by KungFuHamster

I agree a quick spin of the tires is good to knock the rocks off or any accidental moisture the tires may have picked up going around the waterbox. I usually just do a quick spin.

While my times are embarrassing, I can't believe how consistent I/my car was...especially running on street tires with a stickshift. .005 difference between my two passes? that's insane.

113 mph...I should be in the low 12s/high 11's. Oh well. I'll leave the ET on the track and save my tranny. Though I have my answer to my other thread. Screw a blower, I am going to start looking at a magnum swap. What good is 200 extra hp if I run 12's at 125 +mph? That's just foolish.

One thing is for sure. The AUTO is the way to go fast in these cars.

The auto are definitely much easier to make faster. I agree they are way to go if someone is planning on tracking the car often. But my car is mainly a street car and I still prefer to row gears on the street. Gives more of the drivers experience feeling connected to the car.

**Toby** · 08-19-2013, 01:37 PM

Originally Posted by KungFuHamster

I agree a quick spin of the tires is good to knock the rocks off or any accidental moisture the tires may have picked up going around the waterbox. I usually just do a quick spin.

While my times are embarrassing, I can't believe how consistent I/my car was...especially running on street tires with a stickshift. .005 difference between my two passes? that's insane.

113 mph...I should be in the low 12s/high 11's. Oh well. I'll leave the ET on the track and save my tranny. Though I have my answer to my other thread. Screw a blower, I am going to start looking at a magnum swap. What good is 200 extra hp if I run 12's at 125 +mph? That's just foolish.

One thing is for sure. The AUTO is the way to go fast in these cars.

We had a boss out there running 10.50's at 133 mph using the stock 6 speed.. Car has a d-1, fuel system to support, headers, and some control arms. Other wise bone stock suspension with full interior and nothing taken out.

**46Tbird** · 08-19-2013, 11:01 AM

Originally Posted by SlowGreyGT

That won't help at all unless they are drag radials. The sidewalls on a regular street radial do not flex therefor do not benefit from lowering air pressure at all.

Most modern tires recommend 35-45psi for fuel economy and there is NO WAY you're going to be able to hook up on a rock hard 40-series tire with ~400hp and a stick. There is a difference between "take some air out" and "take it down to the air pressure you run in a slick." Most of these guys would get a better launch at ~25psi than they will at 40.

*edit, treed by junkie

**Ear rak** · 08-19-2013, 12:02 PM

Originally Posted by 46Tbird

Most modern tires recommend 35-45psi for fuel economy and there is NO WAY you're going to be able to hook up on a rock hard 40-series tire with ~400hp and a stick. There is a difference between "take some air out" and "take it down to the air pressure you run in a slick." Most of these guys would get a better launch at ~25psi than they will at 40.

*edit, treed by junkie

This.

Taking air out of a street tire is not to make the compound work better, but to let the tire have more give.

All I know is, every time i've gone to the track on street tires, i get better 60 foots with the tires around 24-25 psi compared to 35psi

blownaltered · 08-19-2013, 11:31 AM

Originally Posted by SlowGreyGT

You'd easily hit 12's if your legs were long enough to pin the go pedal to the floor.

..

**DirtyD** · 08-19-2013, 02:36 PM

Originally Posted by SlowGreyGT

You'd easily hit 12's if your legs were long enough to pin the go pedal to the floor.

That won't help at all unless they are drag radials. The sidewalls on a regular street radial do not flex therefor do not benefit from lowering air pressure at all.

Also, if you are on regular radials, don't do a burnout in the water box. Drive around it completely avoiding the water. Depending on the tire will depend on what type of burnout you need to do. Some tires if soft enough will benefit from heating them up, but some other stock type tires will just get hot and greasy making traction worse.

Just my opinion..

That's the beauty of a power sliding seat. I could easily reach the firewall with the pedal. Full foot to the floor.

You didn't race though, so you can't give me much crap.

And FWIW, I aired my Michelin Pilot SS down to 25-26 PSI from 32-33ish. I probably could've done more, but I didn't feel like waiting over an hour for the shitty "mobility kit" air compressor to pump my tires back up from 20 PSI, because I wanted to get home. lol

**46Tbird** · 08-19-2013, 03:00 PM

Originally Posted by DirtyD

And FWIW, I aired my Michelin Pilot SS down to 25-26 PSI from 32-33ish. I probably could've done more, but I didn't feel like waiting over an hour for the shitty "mobility kit" air compressor to pump my tires back up from 20 PSI, because I wanted to get home. lol

The Shell station one mile up the road has free air.

**Luke** · 08-19-2013, 03:04 PM

Originally Posted by 46Tbird

The Shell station one mile up the road has free air.

Haha, I was thinking the same thing. But there's nothing like getting a freak rainstorm while on slicks with 10 or so psi!

**Midnight11** · 08-19-2013, 11:58 AM

Everything is good. Trying to keep stuff offline. Thanks for understanding

**KungFuHamster** · 08-19-2013, 12:00 PM

Originally Posted by Midnight11

Everything is good. Trying to keep stuff offline. Thanks for understanding

Nic, what was your best mph saturday night?

**Midnight11** · 08-19-2013, 12:11 PM

Originally Posted by kungfuhamster

nic, what was your best mph saturday night?

118

**Grandpa** · 08-19-2013, 12:54 PM

Originally Posted by Midnight11

118

That's some good mph for a lil 302 with bolt ons.

**KungFuHamster** · 08-19-2013, 01:31 PM

Originally Posted by Midnight11

118

Originally Posted by SlowGreyGT

That's some good mph for a lil 302 with bolt ons.

agreed! That mph is badass for a bolt on car. Perhaps longtubes/boss intake make a bigger difference than I gave them credit for.

**Luke** · 08-19-2013, 12:50 PM

It was good meeting a few more of you guys. Hopefully next time we all hit the track I'll have the converter in. I can't complain about the track though, with those DR's and 3.15 gears I was surprised the car had enough power to even do the burnout!

**03MachMe** · 08-19-2013, 04:22 PM

Its cool my sister has an auto mustang too.... Im with Jeff on this one. If it is a pure drag race car sure auto is better but it is a lot more fun to slam the gears on the street and at the track IMO. You could my mom in an auto car that is set up right and give her a couple runs and she will be running close to the same any anyone else in that car.

an auto will tell you what the car can do, a manual will tell you what the driver can do with that car.