Engine/Power - EJ25T (STI and 2006+ WRX) Discussions about the USDM 2006+ WRX and WRX STi 2.5 liter turbo flat-four.

why did it do that? -boost creep-

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Old 07-07-2004 | 04:21 PM
  #76  
SuboobaruWRSEX's Avatar
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Send back the CAI. The HKS is a good DP for the price and will give you better performance than stock. But, the Helix will give you more power. With a stock cat back, you should have enough back pressure to keep you safe.

Nick
Old 07-08-2004 | 01:58 AM
  #77  
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Car Info: Mazda Protege '02 (Wishing protege has AWD and a H6 twin turbo)
Originally Posted by SuboobaruWRSEX
Send back the CAI. The HKS is a good DP for the price and will give you better performance than stock. But, the Helix will give you more power. With a stock cat back, you should have enough back pressure to keep you safe.

Nick
Aggreed the helix is good but back pressure on a turbo car is useless. It will get more than enough off the turbo to compensate for any exhust mods you do. Generally free your exhuast as much as possible on turbo cars.
Old 07-08-2004 | 07:26 AM
  #78  
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Car Info: 05 H2 SUT, 45 GPW, 10 Murano, 13 Boss 302
Originally Posted by RoadSpike
Aggreed the helix is good but back pressure on a turbo car is useless. It will get more than enough off the turbo to compensate for any exhust mods you do. Generally free your exhuast as much as possible on turbo cars.
I believe SuboobaruWRSEX was referring to the theory that some amount of backpressure (i.e. cat in the dp) is what is preventing boost creep for the folks that have changed dp's, but aren't experiencing the boost creep issues this thread is dedicated to.
Old 07-08-2004 | 02:48 PM
  #80  
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From: Peoples Republik of Kalifornia
Car Info: 05 H2 SUT, 45 GPW, 10 Murano, 13 Boss 302
Originally Posted by sti2ner
Hey guys,
Oh the most common problem us sti owners have as soon as we mod our car. Well I found a solution to the problem. You can install a boost cut defender. the full mod install instuctions are on scoobymods.com under sti/ then proformance.
There you can see the full install info. Granted porting your wastgate is the best thing for you, to do this will also help in the long run, another q? you guys were having about the check eng. light and cruise coming back on is your o2 sensor thinks the car is running to rich, the helix check engine fix works well, all you have to do is spit open the wire housing on the 02 sensor that is running off your down pipe and soder in the fix, its easy if you can soder, it only two wires. The cel fix is cheap and easy, I would recomend it.

Good Luck

05 black sti, up- pipe, down pipe, turbo timer, 5zegin gn +, ex. manifold, rsr full ex. zeal c-spec full coil over, charge speed full v1 kit, many more mods to come.
Doesn't the boost cut defender prevent the ECU form cutting fuel when the boost creeps up? I for one want the ECU to stop my engine from hand grenading.
Old 07-08-2004 | 03:14 PM
  #81  
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Car Info: Mazda Protege '02 (Wishing protege has AWD and a H6 twin turbo)
Originally Posted by Egan
Doesn't the boost cut defender prevent the ECU form cutting fuel when the boost creeps up? I for one want the ECU to stop my engine from hand grenading.
Yes thats exactly what boost cut defender does.

That is NOT a good idea btw. Running 19psi or higher in an engine with nothing more than a catback can NOT be good, yes 19+psi has been achieved during boost creep. To safely use the turbo with the added performance ehaust you should be porting the waste gate so the turbo is not being spun by the now excess of exhuast gases.
Old 02-09-2005 | 10:13 PM
  #82  
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From: Behind you.
Car Info: 2006 STI
Originally Posted by mario
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.
How long does the process take? Total shipping time from when you sent it, the work was performed, and you had it at your doorstep.
Old 02-10-2005 | 08:54 PM
  #83  
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If a local tuner can do it for you it takes about 20 min and shouldn't be over $50.

Nick
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