I had some sort of problem with my 02 4000rpm into forth and suddenly it goes to 15psi, would this boost level hurt my engine badly? Well anyways I am waiting for my cable that I order!!!
12 afr isnt bad at all if you go over 14.7 then you running way to lean but 12 is still a little rich must tuners tune for 12.5-13 at wot. But boost spike is always something you want to stay away from.
Boost spikes yeah they might be bad, but they really shouded me some good power when it spiked to 15to about 15.5. Well an 05 sti was starting to pull ahead of me when my car boot spike AND I WAS ROLLING, bye bye sti pull at least 1.5 cars ahead of him with my big as smile lol.
Im having the same problem i have a dp and axle back and im spiking to 1.09kpa or 15.8psi if i even converted that correctly. Anything you can do to stop it without EM. Im broke for awhile :notgood:
at what psi does the ecu cut fuel? with after market EM will you car still cut fuel?
ie. if im hitting 10psi stock and maybe the car peaks at 11/11.5 and then i get EM and a custom tune for 17psi will it still cut my fuel at like 18psi? boost usually stays in one general area but every now and then it will jump + or - like 2psi. that would suck if you tune was so close to the stock cut off that every time you hit WOT your car cut off on you
Good Posting Dum Dum And Kjot21. Exhaust No Em Is Not Efficient, But Can Be Run, Not Recomended Though. And All These People Have Been Talkin About 18 Psi On Their Stock Wrx Turbo How Why What!!!!!!! Thats Not Right Even If You Are "tuned" Thats Out Of Its Efficiency Range.
And All These People Have Been Talkin About 18 Psi On Their Stock Wrx Turbo How Why What!!!!!!! Thats Not Right Even If You Are "tuned" Thats Out Of Its Efficiency Range.
I was having the same issue with my 07. I had the helix bellmouth DP w/o cat, traded for the divorced wastegate DP w/o cat and that solved my problem, for the time being, until more money roles in
I've heard of this happening a lot with the EJ25 and although a reflash or stand-alone is the best way to go, there is a poor man's fix...allegedly. Bore out your wastegate passage. I don't know anyone who's tried it, but jscspeed.com says it works:
"04-06 STi OWNERS READ: On the 04-06 STi there are boost spike or creep issues in all cases with the use of an aftermarket downpipe or turboback that uses a bellmouth or external dump tube design. This is because the 2.5L engine pushes so much air. Even with the internal wastegate fully open not enough air can exit to stop spinning the turbo, the result is boost creep or boost spike. You can fix the problem by porting the stock turbo's wastegate passage (any exhaust shop should be able to do this or it can be done at home) or you can get an engine management system to fix the issue, like a UTEC or AccessPORT."
Hope this helps.
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