Ok while i'm shifting up gears i notice dead spot in the acceleration... like it not actually studders but looses power throughout the band. I notice it most in 3rd gear between 80-100 mph. After that it's constant. Anyone else have these problems? My RPMs are not revving up or anything... new stage II kit when this stated happening.... Colder plugs maybe?

 

mine did that before i replaced my flywheel and clutch but afterwords it never did it. I never looked into it.

 

never happend to me, not a clutch though your rpms would shoot up

 

It's your fuel map, it's got a nasty hole. That's why you're unloading in third. lengthen the injector pulse another millisecond, tune the NOS timer, it'll run 9's

jokes. i has them

gm stage 2 tends to do that occasionally. its programmed to run stupid rich. get a custom tune and some ngk bkr7e plugs

 

hmmmm sounds like RavenSS' signature...

 

Thanks Bika i'll look into those plugs.... i should wait to get custom tune untill i have most of my major upgrades done?

 

if you have a GM stage 2 and you dont wanna run so rich, you can always throw a 2.9 inch pulley on and it should make you close to stoich i believe, and you dont need the custom tune just yet homie

 

going with a smaller pulley will NOT "lean out" your afr. it will just make the injectors work that much harder to try to maintain that same rich ass afr that the ecu tune commands. stage 2 injectors are overworked as it is.

if you are staying with the stage 2 pulley and injectors, get your tune done asap. if you are going to change injectors again, eliminate the cat converter, or get a larger throttle body, then you should wait because these require a retune.

 

Thanks trying to get this thing dialed in before the drag day on the 23rd... definitely need to pulll better than a 14.8... that was stock... curious what i'll hit with stage II... without the dead spots.

 

Im awaiting track day also. Last year bone stock i pulled a 14.7 @ 98mph. Now i have stage II also and am dying to get back to the track to see what i can do. My car feels alot more powerful in every gear. Im hoping to run 14.4 ish at just over 100mph. Traction permiting of course. That seemed to be a problem for me last year as it was stock. I cant wait to see how bad 1st gear is now with the stage II .

 

Actually, a smaller pulley WILL lean out the AFR.

 

i have seen this before, and it turned out to be that GM put a boost limit at the top of third gear, and if you dont get it HP tuned to change it, it will "sputter", and pick up speed a lot slower through that range.

 

My car has some hesitation under hard accel b/c I have a few lean codes thrown. Stupid AEM intake.

 

no it will not....the pcm will still be trying to provide the same commanded fuel ratio. You won't lean anything out, just over work the injectors.

 

smaller pulleys won't lean out **** UNTIL you have reached the point where your injectors cannot physically flow any more fuel. then...BOOM

 

Sunburst, your right!
the only way you lean out your A/F ratio is by maxing out your injectors. It's when the injectors can't keep up with the Air flow coming in. Once the injectors go past 100% then they will lean out the A/F ratio. Don't do it your melt your insides.

 

Ahh thanks alot everyone. Anyone know the cost or a place in Washington state that will do HP tuning? I'm in the Seatac area and would love to get this thing resolved! Car did 120 before no problem now i'm limping all over the freeways!

Was just looking at HP Tuners online.... How much time would it take me to learn and properly use this program to tune my own vehicles? does it come with step-by-step instructions or anything? I didn't find anything on the site being friendly with people that don't know how to use it... Anyone here have this?

 

there are still people around who think a smaller pully will lean you out?


wow.

 

No one said anything about past the point of what your injectors can provide.

Anything below that point, runs the same as before.

I knew what you guys meant, just stirring up some controversy in this thread.



Mine's still alive somehow

 

Or lean.... At least from what I've seen on a dyno wideband. I've seen a stage 2 car with a 2.9 up in the mid 12's. So, you may be going lean. Might want to think about a wideband.

 

Yeah, a new tune from a reputable tuner would make worlds of difference!

 

stage 2 runs lean in the low rpms and through 1st gear. at redline in 2nd and 3rd gear it will see afr's of mid 10s on the stage 2 pulley. if he is seeing 12s with a 2.9" then he is fresh out of injector pulsewidth and is flirting with disaster.