i just installed a 3 inch turbo back. very nice. well, i reset the cpu with the negative off for about 15 mins or so. then i took it for a hard drive. i took it to the freeway. accelerated 1st , 2nd , 3rd but then it hit 5k and the gas cut off and a cel turn on with the cruise flashing. i can figure out what is going on? anyone have ideas or have had this happen to them? i am hoping in the morning it will go away.

 

WOW!! this Q has poped up a lot lately but just worded different > But to answer your question you hit what is called boost cut. You hit a certain amount of boost w/ that all to free flowing exhaust. Your car is not use to this and never will unless you port the wastegate or replace the turbo w/ something else. If anyone else knows of any other solutions to boost cut let this guy know

 

yeah let me know. really dont want to dump alot of money to fix this problem.

 

Happened to my stock STi. Subaru said that it occurs alot.

Nick

 

1 solution that i know of so that you keep your TBE and so you don't have to buy another turbo is to send your turbo here-->http://www.deadboltspeed.com/ Jerry can Port the wastedgate for 95 bucks or you can Port & Polish the entire exhaust side of the turbo and gain top end and quicker spool up for 195. 195 includes porting the wastegate & Porting & Polishing of the turbo. But if your one of those that your STi is your daily driver your either going to have to find another turbo ( if its a VF have the Waste gate ported) or put your stock downpipe back on. Luckly a friend of mine had a VF30 to borrow from me that i had sent to deadbolt for P&P. i'll post some pics of a turbo b4 deadbolt and after.

 

Vf39 Wastegate not ported

 

VF 30 Wastegate ported

 

We just have so many members that put TBE exhaust on there STi's that don't know the effects a TBE will have.

Sticky Please :banana:

 

Is TBE bad? Or is just the turbo back exhaust in general?

Nick

 

There is nothing wrong w/ the TBE its just the turbo. I think its the design the waste gate other than that im not actually sure

 

Yes, its the wastegate design in the VF39, it sucks! There are quite a few people having satisfactory results porting the VF39 wastegate to curtail boost creep.

 

i was told that a boost controler can help. he said that what is happening is that i now am boosting 16.5+ so at 16.6 the cars ecu will do a fuel cut defender on the car and that no matter what rpm it will shut the car down. i also notice that when the cel comes up it does not go out till i take out the negative pole.. is this really bad for the car to continue going. also does a boost controller reduce psi on the turbo or is it supposed to let you gain psi instead? aslo i was told that a reflash is suposed to clear this who thing up too, true?

 

I think the only boost controller i seen kinda fix this problem was one that you can controll the gain ie: Blitz SBC-ID. That cost 500 bucks but its a great tool. I also don't think that hitting fuel cut a bunch is bad, the reason why the car does this is to protect it self from over boosting. With a boost controller you can set it as low as the wastegate is set to. I'm not sure of a reflash could cure this problem, but if you ask a professional that does reflashes for subaru's im sure you could get a straight answer from them on that.

 

today i was just keeping it kewl and not reving high or speeding. so im just cruising the freeway then all of a sudden the cel came back. im only at about 3.4krpm. what the ......is going on????? why did the cel and cruise control come on again? i didnt even boost high or speed or push it. just cruising.. can anyone tell me what is going on?