major fight
major fight Alright guys I am about to kill my car. I have be trying to figure out a good tune for it and cant seem to get rid of one problem. I have based most of my tune off of a 05 gto that has similiar mods and was tuned by a pro and runs great. I have a 99 z28 and I can not get it to stop bucking and jerking. It is awful at 1500rpms and bucks and jerks when I give it gas. My only solution so far has been to just give it gas and keep it about 2k rpm.
What I am doing wrong here? Should I be looking at something in particular since it seems to be a issue with giving it gas? please any help or guidance on what I should look at changing to help tame this crazy car.
Also I am using hptuners.
What I am doing wrong here? Should I be looking at something in particular since it seems to be a issue with giving it gas? please any help or guidance on what I should look at changing to help tame this crazy car.
Also I am using hptuners.
Look at the narrowband O2s and see if bucking is
coming on from a lean condition? If so then you have
something to chase down - why.
If you deleted EGR, take a look at the spark adder
for EGR; is bucking coming with a high advance?
Higher than the main spark table says for RPM and
g/cyl air mass?
GTO will have some differences from your motor
and you might want to spend some time getting a
list together. Different MAF? Different displacement?
Something has to account for suck vs great.
coming on from a lean condition? If so then you have
something to chase down - why.
If you deleted EGR, take a look at the spark adder
for EGR; is bucking coming with a high advance?
Higher than the main spark table says for RPM and
g/cyl air mass?
GTO will have some differences from your motor
and you might want to spend some time getting a
list together. Different MAF? Different displacement?
Something has to account for suck vs great.
specs I believe are 226/237 110lsa at .550 lift.
Swaped on my aftermarket maf and it helped alittle. Seems like I am not getting enough air. Def gonna check into the egr thing.
Swaped on my aftermarket maf and it helped alittle. Seems like I am not getting enough air. Def gonna check into the egr thing.
I hvae the same issue after I swapped cams. Bucking under 1500rpm...I think I might have too much timing, been too lazy to look at it lately. Will try tonight though to lower the timing in my HO timing table.
When it is doing the bucking spark is going from around 22 to 29 and just bounces all over within that range. Just a jagged line on the tuners. Map pressure is usually around 45 also.
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It does it when I dont have my foot on the throttle. Also when I give it gas such as in third gear doing 25mpg at 1300-1500 rpm it bucks like crazy untill I get around 2k rpm
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Fixed my problems last night by doing two things:
A. Adding advance in those cells
B. Reducing the transition of timing between cells in that area. I had a transition of 4 degrees between 1400 and 1600rpm.
A. Adding advance in those cells
B. Reducing the transition of timing between cells in that area. I had a transition of 4 degrees between 1400 and 1600rpm.
