dfw

**downtime!** · 08-22-2013, 12:49 AM

Stock tire size on my '12 was nearly 28" tall. I run 295/55's which are about the same height as stock. Car came equipped with 3.55's from the factory. I cross the traps at 7200 in 4th (MT82). 28" works quite well with 3.55's.

**Doug1227** · 08-22-2013, 10:10 AM

Mine was shifting into 4th right before the finish line with my 3.15's. It short shifted at 7000. I think I can avoid this shift all together if I just raise the 3-4 shift point. This SHOULD cut some ET as well since I'm removing a shift. Right? Not sure how much though.

**STROKD** · 08-22-2013, 10:19 AM

Originally Posted by downtime!

Stock tire size on my '12 was nearly 28" tall. I run 295/55's which are about the same height as stock. Car came equipped with 3.55's from the factory. I cross the traps at 7200 in 4th (MT82). 28" works quite well with 3.55's.

Solid point, but you are also going 130+, he does like 114... He would be MUCH lower in the powerband thus killing his time. I think he should get some 26 inch tires personally so it's as close to redline in fourth as possible.

**Junkie** · 08-22-2013, 10:43 AM

28" tire and just make more power.

**DirtyD** · 08-22-2013, 10:49 AM

Originally Posted by STROKD

Solid point, but you are also going 130+, he does like 114... He would be MUCH lower in the powerband thus killing his time. I think he should get some 26 inch tires personally so it's as close to redline in fourth as possible.

Assuming my redline is set to 7200 RPM, in 4th gear (1.32:1) with 3.55s and a 27" tire, I'll be turning around 123-124 MPH.

A 26" tire would basically give me 118-119 MPH at 7200 RPM redline

I think a 26" tire height is my best bet for the power level I will have my car at for a long while before boost. I should never trap more than 118-119 if I'm around 420-430 rwhp (after E85 conversion and maybe a TB). Right?

**46Tbird** · 08-22-2013, 11:11 AM

I'm right at the stock rev limiter in fourth gear when crossing the quarter mile.

3.73s
28.5" tall tire (305/35-20)
114.5mph

Originally Posted by DirtyD

I should never trap more than 118-119 if I'm around 420-430 rwhp (after E85 conversion and maybe a TB). Right?

I dunno about you, but I would expect at least that kinda trap for a modded coyote...

**wbt** · 08-22-2013, 11:16 AM

Originally Posted by DirtyD

Assuming my redline is set to 7200 RPM, in 4th gear (1.32:1) with 3.55s and a 27" tire, I'll be turning around 123-124 MPH.

A 26" tire would basically give me 118-119 MPH at 7200 RPM redline

I think a 26" tire height is my best bet for the power level I will have my car at for a long while before boost. I should never trap more than 118-119 if I'm around 420-430 rwhp (after E85 conversion and maybe a TB). Right?

You will want to give yourself a little cushion. Peak power with the stock intake is going to be around 6,500. 118 with a 27" tire and 3.55 is ~6,900.

**DirtyD** · 08-22-2013, 11:37 AM

Originally Posted by 46Tbird

I'm right at the stock rev limiter in fourth gear when crossing the quarter mile.

3.73s
28.5" tall tire (305/35-20)
114.5mph

I dunno about you, but I would expect at least that kinda trap for a modded coyote...

Originally Posted by wbt

You will want to give yourself a little cushion. Peak power with the stock intake is going to be around 6,500. 118 with a 27" tire and 3.55 is ~6,900.

Brent is/was trapping around 118 with his setup consisting of Boss IM, and all those other goodies. I would think I would be slightly below that, but I don't mind going with a 27" tire at all. Actually, that would be nice to drive to the track on a tire setup that wasn't 1" shorter OD in the rear. LOL

But yes, in perfect math/conditions, a 27" tire would but me basically at 120 at 7000 RPM. 120 MPH should be a low-mid 11 sec pass, correct?

**downtime!** · 08-22-2013, 12:06 PM

Mine has crossed the line at 7200 since day one, naturally aspirated at 115 mph and blown at 130 mph. Gearing is gearing.

**wbt** · 08-22-2013, 12:07 PM

Originally Posted by DirtyD

Brent is/was trapping around 118 with his setup consisting of Boss IM, and all those other goodies. I would think I would be slightly below that, but I don't mind going with a 27" tire at all. Actually, that would be nice to drive to the track on a tire setup that wasn't 1" shorter OD in the rear. LOL

But yes, in perfect math/conditions, a 27" tire would but me basically at 120 at 7000 RPM. 120 MPH should be a low-mid 11 sec pass, correct?

Yes all things considered.

**downtime!** · 08-22-2013, 12:07 PM

Originally Posted by DirtyD

Brent is/was trapping around 118 with his setup consisting of Boss IM, and all those other goodies. I would think I would be slightly below that, but I don't mind going with a 27" tire at all. Actually, that would be nice to drive to the track on a tire setup that wasn't 1" shorter OD in the rear. LOL

But yes, in perfect math/conditions, a 27" tire would but me basically at 120 at 7000 RPM. 120 MPH should be a low-mid 11 sec pass, correct?

My best n/a pass was 11.67 @ 119, so yep, pretty close.

**46Tbird** · 08-22-2013, 12:19 PM

If you're buying a dedicated drag wheel/tire setup, get the 28s. They will work fine with your n/a combo and give you room to grow.

**DirtyD** · 08-22-2013, 12:47 PM

Originally Posted by 46Tbird

If you're buying a dedicated drag wheel/tire setup, get the 28s. They will work fine with your n/a combo and give you room to grow.

You're right. It doesn't hurt to give room for growth. Plus when I go boost in years down the road and swap to 3.31s, that will help prevent me from going into 5th hopefully...

**Oxford14Stang** · 08-22-2013, 09:01 PM

It doesn't really matter. We're all slow.

**STROKD** · 08-23-2013, 12:58 AM

Originally Posted by DirtyD

Assuming my redline is set to 7200 RPM, in 4th gear (1.32:1) with 3.55s and a 27" tire, I'll be turning around 123-124 MPH.

A 26" tire would basically give me 118-119 MPH at 7200 RPM redline

I think a 26" tire height is my best bet for the power level I will have my car at for a long while before boost. I should never trap more than 118-119 if I'm around 420-430 rwhp (after E85 conversion and maybe a TB). Right?

soundsa bout right... also, the Quick Times are bias ply, they grow about an inch when they are wound up, so you can prob go closer to 122...

Absolute WORST case after you have the tires, bump the revlimiter 100-200 rpm if you are tagging it. Those motors will spin to the moon and not g.a.f.