Quote from: J-Will on January 30, 2018, 05:44:39 AM
I skimmed but didn't read in depth, as diagnosis is way out of my league. What ended up being the issue(s)?
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J, it was two issues. one was physical, the other doesn't make any sense (to me) but it was handheld-tuner related.
I had a over boost issue. BAD overboost. stuttering and trying to stall at 5000+ rpm. the ecu would shut all spark off mid run. it was super bad and hard on the car
Fixed that by replacing both turbos. We think the wastegates were not actuating correctly. After replacement the logs no longer showed massive overboost (18+ pounds!)
BUT the issue still happened! but for a different reason. My tuner went bad somehow. The tunes (all of them including stock) still stuttered and freaked out but it was not over boosting .. so initially I thought the problem was the harness. but on a pure bullshit lark ... i reset the tuner.
All the issues fixed instantly, Stock, light boost, Max boost. No more stuttering.
to timeline it with hindsight::
Car was running PERFECT in the summer of 17 on meth.
Started having wierd stuttering issues at high rpm off and on on like october. But no overboost issues.
Went racing one last time, had the best runs ever!
The very next morning the waste-gates were blown.
At the time i had no idea the wastegates were blown and thought it was the meth pump.
Spent a month fiddling with meth.
30 days later, I gave up and reverted to a non-meth tune thinking it was too cold for the amount of meth i used.
*that was when the tuner went bad i think*
after reverting with the now bad-tuner i still had issues, brad said my waste-gates were bad. (we had no idea my tuner just took a crap)
finally fixed the turbos but we still had bad stuttering we were all VERY confused as we did not know the tuner was funky
we looked at logs and everything was 'perfect' .. the give away was we had BAD stuttering/stalling issues .. but we could not 'see it in the logs'
I was about to give up when i was told to try resetting the handheld.
After thinking that was insane.. i did it.
next 2 datalogs look perfect, car felt WAY better
after a few power cycles later, it is now perfect. resetting the tuner fixed the ecu/tune/handheld issue.
that's the timeline WITH 20/20