j92s

Background: F22 bone stock, drag II kit. Fuel pump, FMU. Running super rich. 3" exhaust, test pipe, running 5psi

Sometimes (not all the time), when im boosting, the car quits making power and actually slows down. A/F on stock oxygen sensor reads rich (of course).

Scenario 1 - cold night, running 80 on the interstate. Any time i would give it any gas to pass cars, it would spool up, but immediatly after starting to boost, the engine's power seems to die.

Scenario 2 - at the track. ran a 15.7, then a 16.6 Did the same exact thing, i just couldnt make any power.

My friend with a 5th gen/greddy kit 8psi is having the same exact problems. Any ideas? Could it be just running way too rich? Hopefully ill have a wideband before too long.

Thanks!

 

j92s

- BUMP -

replaced my battery cable with a 0/1 gauge. still having problems. Ordered an MSD, maybe that'll fix it. Any other suggestions?

jmcn

How do/did the plugs look? Did you check for boost leaks?

__________________
Jeff

'97 240SX KA-Turbo, '93 Sentra SE-R | jmcn.com

schwett

hmmmm could it be a problem with whatever method you're using to prevent the stock ecu from seeing boost? does it feel kinda like hitting fuel cut, or just major "bogging?"

bradboy

I agree it sounds like your map is getting positive pressure.

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Boosted 93 Vtec

Obsidian7

Like other people are asking: what are you using to keep the ECU from seeing boost?

Also, what are you using for timing control?

Looking at the plugs is the easiest way to get some kind of clue as to what's happening.

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Tony S.
'03 WRX ... 12.69 @ 108.0 - full interior, stock 16s, street tires
'99 2.5RS
'97 Prelude (old car) ... 13.94 @ 100.3 - full interior, empty trunk, 17s, street tires.