[Clap135]

Originally Posted by GeorgeSmooth

With a 1.9 60ft not so good.

What kinda pressures are you running in the MT's? I am assuming a good healthy burnout prior to launching right? If all of those are good, then it is simply the track, we have stock turbo cars that trap higher, meaning they make more power at their elevation and people don't seem to have any issues with traction. Must be frustrating to do all that work and then be let down because of trap prep.

[GeorgeSmooth]

Originally Posted by Clap135

What kinda pressures are you running in the MT's? I am assuming a good healthy burnout prior to launching right? If all of those are good, then it is simply the track, we have stock turbo cars that trap higher, meaning they make more power at their elevation and people don't seem to have any issues with traction. Must be frustrating to do all that work and then be let down because of trap prep.

I run 11psi. Its the actual track and the prep and this is the best track we have on the continent.

[dzenno]

11psi in those tires is kinda low, no? 18-22 might've been better for trap speed..

Congrats on the runs though...

[Clap135]

Ive mentioned this before, I feel like all the guys running drags to set records are all using the wrong set up. For drag racing you need a taller tire with flex. I believe oldbooster is the only guy that has a somewhat proper drag wheel/tire set up.

[dzenno]

What do you recommend?

[Clap135]

16 inch wheel, yes some will fit. 50mm on the tire height at a min.

275/40 is simply not enough tire height to really bite down and flex.

[Clap135]

http://www.n54tech.com/forums/showthread.php?t=4865

Here is where oldbooster got the wheels from. I am not sure if the 135i and 335 brakes are the same size, however i think the calipers on the 135i are bigger.

[dzenno]

Think I might go with that this coming season..what about the front? DRs or slicks, brand?

[Mr. 5]

Originally Posted by Clap135

16 inch wheel, yes some will fit. 50mm on the tire height at a min.

275/40 is simply not enough tire height to really bite down and flex.

Yes, 16s would be better but 17s are perfectly fine and they actually do a good job with biting.
And, I'm pretty sure that the brakes on the 135 are smaller in diameter when compared to the 335.

I've run 1.6 60 fts on the 275/40R17 tires.
Tires are important but a huge factor is heating them up.
A lot of people do a little scuff and they say that they warmed up the tires when in fact you need to really warm them up!

This is how you warm up the tires and this was done on the 275/40 17 Hoosiers...

[Clap135]

Why would you think the brakes on the 135i are smaller, the 135 has 6 pistons up front and 4 pistons in the rear, i think the 335 has 4 up front and 2 in the rear.

[Mr. 5]

Yah, the rear 135 brakes are 12.8"
The rear 335 brakes are 13.2"

When I put the Kosei's on there isn't that much room between the caliper and the barrel.

[OpenFlash]

I run Hoosiers drag slicks (275/40-17) mounted on the usual Kosei K1s and have no problem cutting 1.6-1.7' 60' times with decent track prep. On a 6AT, you can do even better high 1.5s repeatably. Not sure how much better a 16" rim will be.

As Mr. 5 said, the key is a proper burn out. And for that you need smoke-happy spectators and a line lock.

Shiv

[Mr. 5]

Originally Posted by Clap135

Why would you think the brakes on the 135i are smaller, the 135 has 6 pistons up front and 4 pistons in the rear, i think the 335 has 4 up front and 2 in the rear.

Actually, the 135 has 6 up front and 2 in the rear.
The 335 has 1 up front and 1 in the rear (Floating calipers).

But. it's not all about pistons.
The size of the rotor is important. A bigger rotor disperses heat much better than a smaller one.
This is why it's not really considered an upgrade for a 335 to go with the BMW performance brakes. Yes, it's a 6 piston caliper but it uses a smaller rotor.

[Clap135]

I mentioned pistons, becaue the 135 caliper is simply looks bigger. I visually compared these with jpslicks car when first got our cars and the size difference was noticable.


As for a 16 inch wheel. Anybody with some drag racing experience will tell you a smaller rim with a taller tire will always hook harder then a bigger wheel.

[hipnotic]

congrats

[Mr. 5]

Originally Posted by Clap135

I mentioned pistons, becaue the 135 caliper is simply looks bigger. I visually compared these with jpslicks car when first got our cars and the size difference was noticable.


As for a 16 inch wheel. Anybody with some drag racing experience will tell you a smaller rim with a taller tire will always hook harder then a bigger wheel.

Yes, the calipers are bigger but the overall diameter isn't.
This is what prevents us from going with a 16" wheel.

I completely agree that the smaller the wheel, the better. And the smarter too since it's cheaper for a smaller tire.
But, a 16" wheel won't fit over the 335 brakes.
If it did, I'd run it.

[Clap135]

Originally Posted by shiv@vishnu

I run Hoosiers drag slicks (275/40-17) mounted on the usual Kosei K1s and have no problem cutting 1.6-1.7' 60' times with decent track prep. On a 6AT, you can do even better high 1.5s repeatably. Not sure how much better a 16" rim will be.

As Mr. 5 said, the key is a proper burn out. And for that you need smoke-happy spectators and a line lock.

Shiv

And you wheel hop your butt passed 60 feet. By simply running a smaller wheel with the same or slightly bigger overall diameter tire, you would loose most of your hop.

[Clap135]

Originally Posted by Mr. 5

Yes, the calipers are bigger but the overall diameter isn't.
This is what prevents us from going with a 16" wheel.

I completely agree that the smaller the wheel, the better. And the smarter too since it's cheaper for a smaller tire.
But, a 16" wheel won't fit over the 335 brakes.
If it did, I'd run it.

There has got to a wheel that fits. Any of the hardcore drag 335 guys ever consider swapping rear brakes with a 330 or 328. Those are smaller i believe.

[Mr. 5]

Originally Posted by Clap135

Add you wheel hop your butt passed 60 feet. By simply running a smaller wheel with the same or slightly bigger overall diameter tire, you would loose most of your hop.

The only time I saw Shiv wheel hop was when he wasn't burning out his tires properly. Wheel hop will happen on any tire that isn't warmed up correctly, no matter how tall the tire is.

[Mr. 5]

Originally Posted by Clap135

There has got to a wheel that fits. Any of the hardcore drag 335 guys ever consider swapping rear brakes with a 330 or 328. Those are smaller i believe.

Oh for sure. If you start talking about swapping brakes then of course.
But, it's not worth it for me.
I guess I'm not that hard core.

[Forcefed3]

Originally Posted by GeorgeSmooth

Oops Meth is missing in my sig. Runs on pump and meth 80/20 mix.

With upgraded turbos AND meth I thought it would be around 11.6 or 11.7?

[OpenFlash]

Originally Posted by Clap135

And you wheel hop your butt passed 60 feet. By simply running a smaller wheel with the same or slightly bigger overall diameter tire, you would loose most of your hop.

The only time I saw big wheel hop was before I got my line lock. Before that, i couldn't warm up the tires sufficiently. But with the tires fully warmed and gummy, you can drop pressure a bit and use the sidewall distortion to absorb a lot of the "shock" that occurs when you drop the clutch at 6000rpm (as I have to do with my 15lb flywheel). And there is plenty of sidewall to distort when you run 275-40-17s. Going down to 16" rims isn't an option with our rear brakes. Even if it was, I don't see it being much of a benefit. At this power level at least.

And btw, I don't think my 1.6X sec times would even be possible if I was hopping my butt passed 60' mark.

Shiv