DougsfastZ

iTrader: (4)

A little backround on the car. The original motor was hydrolocked last year and we replaced it with an 02 LS1 crate motor. We used the 98 intake and EGR on the 02 motor. We also kept the 98 PCM in place. The car has never had and aftermarket tune installed. The car takes a couple of cranks to start then runs smooth. When you got WOT, the car is smooth but doesn't pull strong at all. It does have and SES light on, but it's for bad 02's (front and rear), which shouldn't matter at WOT. Here are some mods:

Lid
ORY
B&B catback
Shifter


Here are some things we've done over the past year.

Multiple MAF sensors
New Fuel Pump and filter
Check TPS volatage, it's good
Plugs and Wires

The next thing we were thinking was to pull the injectors and see if they are clogged.

Any ideas?

Doug D

PowershifterNC

dude you got to get that thing dyno tuned

twitchtwice

iTrader: (12)

tune and new 02's immediately

qwk93ta

iTrader: (13)

I agree with the comments above....get a tune.

-98-Z28-Darkness-

iTrader: (7)

tune but also i think its weaker than your old ls1 since it does not have the ls6 intake.

DougsfastZ

iTrader: (4)

Why would it need a tune for just a lid and exhaust?

Are the GM tunes different from 98 to 02?

Doug D

PowershifterNC

anytime you change anything affecting the motor you should get it tuned as it changes different aspects of airflow...thats why you do everything at once so you don't pay a fortune for a dynotune. IE...my car ran great before I got it tuned. Turns out it was way lean, could have hurt my motor if I would have waited

miked003

so whats the deal with stuff like hypertech tuners if you should get a dyno tune. like i have k@n air charger flomaster exhaust aluminum drive shaft and im selling my hypertech tuner to get a hyper pack tuner should i forget the tuner and get it dyno tuned?? or are you guys saying that he needs a tune just beacuse he has a new engine. shouldnt the car computer compinsate for the better air flow by itself.

PowershifterNC

to a point the computer can compensate but eventually if you keep adding mods you'll have to get a dynotune. If you can tune the car yourself by all means keep doing so and save yourself money in the long run.

406malibu

might also seem down on power since you have a 02 crate motor... they have a smaller cam than the 98-00, and w/o the ls6 intake it will be slower than your old 98 was...

melchoir

iTrader: (4)

This will probably account for 5-10rwhp.

black_phoenix

iTrader: (27)

just like some guys have mentioned... dyno tune my friend