On a stock evo x if you ran 4th gear all the way to the cut off, what would be the mph?

 

~115 @ 7700 rpms
edit: ~110 in the MR

 

^^Sounds reasonable, since I have hit 107-110 @ 7200-7400 rpm in 4th gear.

 

well last time at the track i ran a 12.92 at 106.09. Would it be beneficial (and safe) to just run 4th all the way instead of going to fifth?

 

If your only trapping 106 you should finish the 1/4 in fourth gear.

 

is there absolutely any damage being done from pushing 4th till the fuel cut off?

 

just minor wear.. sounds about right for 4th..

 

i trapped 108 in the 1/4 and i had like no 4th gear left

 

those numbers were calculated using stock rim & tires sizes.
if you changed your rims, tires or air pressure you changed the calculated variables used and will get different results.

 

true

 

YES, yes, and YES again! Do not shift to 5th. You shouldn't shift to 5th unless you are bouncing off the rev limiter more than once. Even if you bounce off it once, I would still not shift to 5th. You're welcome to try both and see which gets you faster times...but I am confident you will get the same results as everyone else.

There is even a shop who raised their rev limiter to 8,600 just to stay in 4th gear over the finish. It was over 120mph. SO if they are staying in 4th at 120mph, I think you are safe at 106mph.


Then it's time for you to raise the rev limter.... Mine is set at 8,000rpm which is fine....

 

Yeah but im sure they built it to handle the higher rpm's... I wouldnt trust the stock internals with raised rpms

 

thats straight

 

Has any one found a way to remove the rev limiter yet? O:

 

EcuFlash can raise the rev limiter, removing it completely would be reckless. I've seen reports of valve float with rev limits set as low as 8200 and other cars that have occasionally turned 8500 with no problems yet. Every car is going to have slightly different thresholds but in general raising the 7600 rpm limiter to 8000 "should" be ok. There is always that case where you have a Friday car and it just isn't quite as good as the rest.

To safely run 8500 RPM's I would have stiffer valve springs and titanium retainers installed when replacing cams. When doing a complete engine build you can replace Rod bolts and balance other internals so that 9000+ is possible. I'm currently running an 8000 rev limiter and so far haven't had any issues but consider it one of those things done "at your own risk". If your car isn't tuned well and you are constantly bouncing it off the rev limiter, something will break sooner or later.