yeah it is a pain in the ***, Never had any problems until the cold weather started arriving.

 

Santa sent his elves to all the bad Evo owners houses and had them put velcro on the throttle body spring end-plates.

 

I tryed almost everything to solve this issues, but it seems to me that at 5000-6000 rpm and higt boost, the air compressed in to the engine cannot be used, (too much flow for the need of the engine in that moment).
Since I installed pulley cams, I retarded from std point, 2° the exhaust cam, and the problem gone.(...at the moment!!)
I came to the following conclusion,
As the Evo have belt , there is always some difference in the timing of STD cams, the ones that are advanced in the exhaust from factory set up,are producing this problem.

Please consider that this is only based on my experience, is not proveed to work for other customer, do not blame me if the problem is not solved in this way, in your car.

 

hmmm, sounds like a possibility.

 

just to add, i never linked this problem of mine with cold weather.

 

throttle boddy spring? has anyone tried it?


Ed-

 

only at the track - i want rpms to raise

 

I don't think that would be it. The rpms would raise every time you shift not just between 5-6k rpms

 

true
ECU is out of the question also. got reflash , no difference.

 

we will never figure it out.

 

thats also right around the point where peak efficiency from turbo occurs (highest cfm values from compressor housing) after that it starts to push steam (might be a point in which the acceleration starts to deccay) hence the no need for a stronger spring rate on the spring after 6k.

p.s.--i apologise for the spelling english isnt my first language, if you dont get what i'm sayin i'd gladly explain in better detail.


Ed-

 

You have a 03 right.? I was thinking it might have something to do with the 5k launch control but it's doing it to 03s and 04s so I guess that out of the question. This is fustrating.

 

no its not a year thing, i have an 03 also.

 

I know, I have a 05 and it's doing too.

 

yes, mine is 03
kind of wierd but now it happens only sometimes. i used to be able to replicate the problem everytime but now its not always that it happens