Spiking to 19.5PSI...No CEL Though????
10-22-2004, 07:46 AM
#1
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Spiking to 19.5PSI...No CEL Though????
Hey,
I bought this thing used so I have no idea what he did to it. The STi has an electronic boost gauge that will show/hold max boost. My STi spikes to 19.5PSI as indicated on the EBG. It quickly settles down to 16PSI though. That said I haven’t had a CEL or any problems with my STi...she pulls good IMO. Others on this board indicated that I would need some type of engine management to hit 19PSI without getting a CEL.
What gives? How could I tell if he had an ECU installed (where would I look)? Should I be concerned about the high boost pressures? Should I port it (if it isnt done already)?
Mods (that I know of)...
3" Turboback/No Cat (unknown brand)
KN SRI Intake
I bought this thing used so I have no idea what he did to it. The STi has an electronic boost gauge that will show/hold max boost. My STi spikes to 19.5PSI as indicated on the EBG. It quickly settles down to 16PSI though. That said I haven’t had a CEL or any problems with my STi...she pulls good IMO. Others on this board indicated that I would need some type of engine management to hit 19PSI without getting a CEL.
What gives? How could I tell if he had an ECU installed (where would I look)? Should I be concerned about the high boost pressures? Should I port it (if it isnt done already)?
Mods (that I know of)...
3" Turboback/No Cat (unknown brand)
KN SRI Intake
10-22-2004, 09:01 AM
#2
A turbo back exhaust will cause boost creep...once u boost too high, u will hit the cutoff, which is why ur boost drops...its a serious problem...do a search on boost creep and u will see wut i mean...
10-22-2004, 09:14 AM
#3
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Originally Posted by Paperchasin
A turbo back exhaust will cause boost creep...once u boost too high, u will hit the cutoff, which is why ur boost drops...its a serious problem...do a search on boost creep and u will see wut i mean...
I have not hit cutoff...you know when you hit cutoff. Cutoff will be somewhat violent, not gradual...at least it is in my GSX.
I need to know how I would tell if it has a modified ECU? I have a feeling that it is modified because no CEL and no fuel cutoff with spiking to 19.5psi.
10-23-2004, 10:46 PM
#5
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Location: Walnut Creek, CA
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Car Info: CRZ EX-Navi/6MT & Vue Redline
Originally Posted by Paperchasin
I see....maybe u just have a bad gauge??
-Chris
12-30-2004, 02:04 PM
#6
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Join Date: Jan 2004
Location: 408
Posts: 29
Car Info: 04 STi
Originally Posted by polyol
I know what boost creep is...I have it on my GSX. This is not boost creep...its a boost spike. Creep is when you are at WOT and your PSI goes up and up and up till you hit fuel cut. Mine hits high and falls off and stays at 16 psi or so. That’s spiking.
I have not hit cutoff...you know when you hit cutoff. Cutoff will be somewhat violent, not gradual...at least it is in my GSX.
I need to know how I would tell if it has a modified ECU? I have a feeling that it is modified because no CEL and no fuel cutoff with spiking to 19.5psi.
I have not hit cutoff...you know when you hit cutoff. Cutoff will be somewhat violent, not gradual...at least it is in my GSX.
I need to know how I would tell if it has a modified ECU? I have a feeling that it is modified because no CEL and no fuel cutoff with spiking to 19.5psi.
12-30-2004, 06:16 PM
#8
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Location: Peoples Republik of Kalifornia
Posts: 14,221
Car Info: 05 H2 SUT, 45 GPW, 10 Murano, 13 Boss 302
Mine does this with an ECUtek reflash and 3" TBE. I have two boost gauges (one GReddy dial gauge that is electronic and one PSI3 data display that reads directly form the ECU) and they both reported the high boost. In fact my PSI3 recorded 20 psi. This only happens at WOT accelerating onto the freeway when it is cold out (<40 F). The spike is momentary and the ECU immediatley adjusts. No CEL's have ever gone off and the engine is running fine.
I believe it is just a matter of the turbo getting ahead of the ECU for an instant.
I believe it is just a matter of the turbo getting ahead of the ECU for an instant.
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