So, I'm having a hard time hooking up off the line. My 60fts are high 1.7s and I know I would probably be mid 11's if I could get 1.6's. Stats on what I'm currently running are as follows:

Tires: Toyo R1R street tires (140 treadwear rating)
Tire Pressure: 34 psi (thinking this is a major culprit)
2 step: 6200 rpm (thinking this is too high)

I don't do a straight clutch dump, but rather a very fast slip. I'm thinking I'm applying too much throttle in first gear as it spins the whole way through. This wasnt a problem before, but since I gained 60 ft/lbs with E85 - its damn hard to lauch w/o spinning terribly.

With my worst 60ft at 1.79 I ran my lowest ET of 11.71 - I attribute it to simply faster shifting than my other runs. I had gained 4mph by the 1/8th mile (95mph).

Please let me know what you would do if you were me. Advice/criticism is welcome .

 

drop tire pressures into mid 20's at least would prolly help..you may want to drop the 2 step a little also

 

Drop your tire pressure down to at least about 28psi. Make a couple of runs and change the tire pressure again. If you're still spinning after dropping the tire pressure in the 25psi range, lower the rev limiter to around 6k. That should help out.

Also, looking at your run with the quickest ET, either you're shifting is really slow and you're dropping out of boost or something is going on. You said your 1/8th mile was 95mph while your trap speed is 119.4. Your trap speed should be in the 122-125mph range. Most any car will average anywhere from 27-30mph in the 2nd 1/8th mile. You're not even picking up 25mph. That said, the car has the power to run deep into the 11s if you can get your 60' times down a little more and find out why you're not picking up much speed on the back half. Could be the stock cams holding power back, but I would think you would still pickup at least 26-28mph. Even a stock Evo will pick up that much on the back half.

 

Yeah, I don't really fully understand what happened that run. On my previous 2 runs, I was at about 91mph through the 1/8th mile and was trapping 121mph in the 1/4. On that last said run, I had gained 4ph through the 1/8th and lost 2mph in the 1/4 - my shifting definitely felt faster than prior runs (which is why I think my ET was lowest). I think it may have been missing up top in 4th. My car really wasn't tuned to be run that high in 4th gear, so who knows what the hell its doing up near 8k rpm.

I like the advice so far, anything else?

 

as said before lower tire psi (imo to around 24-26) and the 2 step to 5800-6000 also do you have anti-lag as an option?

 

Anit-lag? Is that similar to no lift to shift?

 

There's too many problems with this post for me to ignore it. First off you are going to need to drop your tire pressure to lower 20's range, ie: 22F 23R. Secondly you should drop your 2step to 6k, NOT your rev limiter. Last but not least there is nothing wrong with your trap speed at all. A normal stock turbo setup is supposed to gain approximately 25mph in the back half, give or take 0.5mph. With a 119mph trap your good for an 11.4 possibly high 11.3. Good luck OP.

 

The same thing was going wrong with my friends times, so while Id definitely agree on the tire pressure drop, heres one other scenario just to consider.

He was at 13 flat and could NOT for the life of him hit a 12. All he has are exhaust, intake, and mbc at 24psi on the stock turbo. We knew the car had the 12 in it as it was even on his crappy tires and lack of driver mod

Eventually it hit me, knowing how badly the stock turbos run out of breath in the upper rpm's I said to him one day, stop revving out to redline (his is 7600) and shift around 6500-6800 to stay in your power band. He did just that and he finally got his 12...and he went 12.8 too on a 1.78 60ft.

So thats what Id say to try if you're revving all the way out, don't. Shift a few to several hundred rpm earlier than normal to keep your car in the fatter part of its power band. .

 

Listen to what Ryu said also if your spinning in first let off the gas a little sorta like pedaling.

 

thats very true a lot of people make that mistake and shift at 7600-8000 rpm on a stock turbo, but it does run out of power in those rpms.

 

I usually shift anywhere from 7200-7400. I know i'm losing some power in that part of the rpm band (especially with stock cams), but I don't want to be too far down in the rpm band on the next gear.

 

With a proper launch, what would be considered a solid 60ft on street tires?

 

I've cut as low as a 1.63 60' on street tires. It's on of those things where practice makes perfect (or at least close to perfect).

 

I would say 1.6. Or1.5 with some luck

 

I ran my tires at 24-25psi and was consistent mid 1.6 to low 1.7 60' on the stock turbo. And it IS a rev limiter...look in ECUflash. It's called your stationary rev limiter. I'm sure the OP is smart enough to understand that. As for the 25mph back half, I guess the OP's response of running 91mph on the 1/8th mile and trapping 121mph the 2 previous runs were just flukes then.