hey Guys,

running an aps st kit with external wastegate on the unichip. I never usually go crazy on my car, i usually drive normally and shift around 3k rpms. however yesterday when i was coming back home from dinner, i decided to "let her rip" on the freeway. However, i realized that after each shift my car bogs for about 1 second and then returns to its usual pull. Is this because of my noob unichip? I realized that since unichip is a piggy back it takes away timing around 5200rpms according to my dyno sheet. Any suggestions on why this is? thanks in advance.

 

who is pulling timing, the ECU? If all of a sudden timing is being pulled then it means you are knocking crazy. Either you are running to much timing or you are running lean that your car start to knock. Check the tune.

 

I have to ask, u are not confusing lag with bogging

 

im pretty sure that the problem is not tune related since Sam@GTM conducted the tune. what does knocking sound like/feel like?

 

You can't feel knock but the sound I normally hear is detonation which is pinging. I can hear the sound of small pieces of stone hitting a sheet of metal, this is when I had detonation at real high rpms on my Vortech.

If your are experiencing bogging after each shift then I doubt it's knock as this would happen at high rpm like WOT and yours is right after shift, maybe it is lag but the small APS turbos usually don't have enough to feel.

 

sounds like a tuning issue with timing and fuel... Sam is not god, **** changes the ecu will try to correct if its not running they way it thinks it should...

 

+1. Because of the higher TQ of a Turbo, you'll feel that little jerk when letting of the gas. Are you sure it is not that?

 

hmm. is there a way to check the problem without spending 500 bucks for retune? the cars runs perfectly fine other than this. :[

 

thing is i can hear the exhaust stutter when the bogging happens. man i hope this isnt a big issue.

 

good point.. Now I'm confuse which one to side with Usually you go back to your tuner after a few weeks just to make sure everthing is ok. It is hard for the Tuner to spend 24hrs in tuning to cover every possible angle so go back to GTM to be sure.

 

GTM should not charge you if the mistake is in their part. As long as you didn't add any Mods and didn't touch anything then they will take care of you

 

Why would you have to spend another 500, if you take it down to him and confirm there is an issue with the tune then it should be done for free. Again this all depends on when you first had it tuned as things do change due to climate and other things.

 

it shouldnt be $500 then GTM is smoking crack... Take it to Shawn at Churches if GTm wants $500... Shawn charges like $175/hr i think it should be a 20 min fix if its that.

Last time I had a small issue like this it only cost me lunch and $20

Good luck but doesnt sound like a major problem... whats your A/F at? usually you can tell by that

 

my af is at 11.5 straight. i probably should give sam a visit. my friend is getting his vortech done there anyway.

 

i had the tune done at the end of august so i guess its been about 3 months.