ecm - injectors

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Sep 23, 2011 | 10:31 PM

camaroboy199290

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Joined: Feb 2006

Posts: 186

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From: blairsville Ga

Car: 89 iroc

Engine: 355tpi

Transmission: jasper 700r4

Axle/Gears: 4.11 lsd

ecm - injectors

i have a camaro with a 305 tpi all stock but it has a chip for a 350 in it would this make the car run lean or rich

Sep 29, 2011 | 12:50 AM

skibum2100

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Joined: May 2010

Posts: 259

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From: Boulder Colorado

Car: 1988 GTA

Engine: 5.7 TPI w/ Bosch III's

Transmission: T56

Axle/Gears: 3.27 Borg Warner 9 bolt

Re: ecm - injectors

A 350 chip in a 305 will be rich.

Sep 29, 2011 | 07:42 AM

RBob

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From: Chasing Electrons

Car: check

Engine: check

Transmission: check

Re: ecm - injectors

Quote:

Originally Posted by camaroboy199290

i have a camaro with a 305 tpi all stock but it has a chip for a 350 in it would this make the car run lean or rich

If this is the '89 the engine will end up running lean. The BLM will increase to add additional fuel.

The reason that it will be lean is that the injector flow constant in the calibration is higher. The ECM will calculate a smaller PW for the given airflow (from the MAF).

Of course this is assuming that the stock 19 #/hr injectors are still being used.

RBob.