When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Procharged Z51 on R888Rs breaking up/TC issues at track
Need some advice here. I'll post the video once it's completed.
My car is a z51 with base P1SC kit. I've tracked it extensively in ambient up to 100*F with no problems from normal operating temp up to almost max temp. IAT never goes above 130.
Today I took it to the track with new R888Rs 295/30/19 on rear 255/35/18 on front (about 0.75" shorter than stock on both, I've ran 1" greater than stock rear only with zero problems). It ran fine for the first 15 minutes or so. After that it started to break up / stumble slightly at higher RPMs. It is pretty consistent past 5000 rpm or so. This has never happened before.
On the 2nd session, the car popped up a service rear axle warning and went to limp mode about 15 minutes in. I cleared it at the end of session. Engine was still breaking up at higher RPMs. I also had a "multiple cylinder misfire" error.. Doesn't help that 1 of my exhaust valves burned up (3rd time) and starting clicking and clanking. At first I Thought I blew my trans or diff, piece of **** valves.
3rd session the engine was breaking up a little bit on the first 1-2 laps with the temperatures relatively cool. 3 laps in (after a new 2 second personal best) the car gets a service rear axle and stability track warning. Limp mode.
Only other thing I've done recently is clean/oil my K&N filter. I definitely overoiled it but thought leaving it out to dry for 2 days was enough. I've driven the car 2-3 times since oiling before the track day.
-Is it possible that with the higher engine/IAT temps, any excess filter oil that had dried in the charge tubes wetout again and dirtied the MAF? Would a dirty MAF cause the stumble?
-Is it possible that the engine stumbling is causing the stability track to think the minimally eratic wheel speed changes during track-out is slip and shutting it down?
I didn't get a chance to go around turns with traction and stability full off to see if it doesn't give service axle warnings/etc. But it was still stumbling so its not traction control kicking on.
Spark plugs are 1 temp colder for supercharger and have 15k miles.
This is my last lap before having to go out. Might be able to hear breaking up somewhere in there.
These plus in the c7 I have not seen anything like them from being in a DI motor. So I would pull plugs & just chg them out more so if the car is running meth. Also if it has been retune & running rick.
You cant tell that much at looking at the plugs that it is bad from running rich. These cars if the plug is just fouled some what & it don't look that bad to you but is black black chg it out.. Plus did you make sure all plug wires are on really good if not on a good heavy loud on the car it could cause it..Robert
Last edited by robert miller; 04-11-2018 at 04:07 PM.
These plus in the c7 I have not seen anything like them from being in a DI motor. So I would pull plugs & just chg them out more so if the car is running meth. Also if it has been retune & running rick.
You cant tell that much at looking at the plugs that it is bad from running rich. These cars if the plug is just fouled some what & it don't look that bad to you but is black black chg it out.. Plus did you make sure all plug wires are on really good if not on a good heavy loud on the car it could cause it..Robert
No meth. I'm running the plugs recommended for a base supercharged kit. I haven't touched the plugs and wires since I installed them 2 years ago.
Okay thanks. If I pull them I'm replacing them. It's a nightmare.
Just the back one on the pass/side but then to have to pull out the fuse box. Really man I had my car at a shop in Nashville they let to much meth get down foul out the plugs so bad car wouldn't run almost under load. He told me for 1 week it is not the plugs I told him to do it any way. Guess what it was the plug car started running great then.
He told me by looking at them he would have put big $$ that it was not the plugs. I didn't think chging them out was that bad at all. But let say this those dam plug wires was a B---h to get fully onto the plugs.
MAF looks fairly clean. I'll clean it anyway and clean the inside of my easy to reach charge tubes. Check all the plug wires and any wire harness for obvious shorting and nothing. Guess I'm buying plugs and wires and doing it all.
MAF looks fairly clean. I'll clean it anyway and clean the inside of my easy to reach charge tubes. Check all the plug wires and any wire harness for obvious shorting and nothing. Guess I'm buying plugs and wires and doing it all.
Now these plug wires are really good for being a factor piece.
I got plugs coming but the annoying part is it was only above 5500 rpm or so at the track. I'd think a bag plug or wire would be consistent. So I cleaned the MAF and going to put that back together and romp on it a few times...
Last edited by BrunoTheMellow; 04-12-2018 at 07:48 PM.
I once ignored a misfire in my eagle talon on the drag strip. It cost me an engine. However it was an entire cyl I had lost due to an injector plug coming off. Something to think about. I was NOT going to lose to the car I was racing at the time. Now I think much different about stuff like this. Be careful buddy these engines aren't cheap.
I once ignored a misfire in my eagle talon on the drag strip. It cost me an engine. However it was an entire cyl I had lost due to an injector plug coming off. Something to think about. I was NOT going to lose to the car I was racing at the time. Now I think much different about stuff like this. Be careful buddy these engines aren't cheap.
Yeah definitely plan to fix it before going out again but I can't figure out why it was only happening at high RPM. I did a couple of 1st gear punches in the skid pad before my last session and it did that just fine. No rough idle. No hesitation.
Last edited by BrunoTheMellow; 04-12-2018 at 07:52 PM.
Yes! Finally an engine code that helps! Cylinder #2 misfire. Went for a drive after cleaning the MAF, 1st gear pull was good, 2nd was good, 3 hesitated at 4500+ RPM and then flahsing engine light. Turned off and the only code I had was cyl 2 misfire.
Last edited by BrunoTheMellow; 04-13-2018 at 06:28 AM.
I'll change all plugs anyhow. My car has been a little sluggish recently and maybe they are all fouled up, 15k miles supercharged and I drive it like i stole it... from a thief.
Last edited by BrunoTheMellow; 04-13-2018 at 06:29 AM.
04-11-2018, 01:36 AM
Procharged Z51 on R888Rs breaking up/TC issues at track
Plus did you make sure all plug wires are on really good if not on a good heavy loud on the car it could cause it..Robert
Just the back one on the pass/side but then to have to pull out the fuse box. Really man I had my car at a shop in Nashville they let to much meth get down foul out the plugs so bad car wouldn't run almost under load. He told me for 1 week it is not the plugs I told him to do it any way. Guess what it was the plug car started running great then.
