True Ken..And Tuning is the one variable that isnt all that easy to do when you dont have thee proper equipment. But unless something is way off the tune shouldnt be doing this. For instance if you had the proper MAF/Fuel injector calibration teh tune should just get you on the money..Not make 80 plus RWHP.
Something else has to be going on or is bad..I could be wrong but I even recall Dav esaying a tune wont gain you massive amounts of power..Which it seems you are missin. Just time to start trouble shooting
I feel for you Ken. I too am involved in a big finger-pointing charade with my broken SC.
Ken, that AFR doesn't appear to be "all over the place, but it is going lean on top like it's running out of injectors.
I would need more data to really tell what is going on. A MAF log would be a big help.
Ken I'd be willing to do a test fitment on my teal car:O)...You know..See if it works ok and all....
My first reaction was to drive the car in the ditch, Second reaction was the car is not worth any more time or money, but the truth is I still love the car, I beleive it can be fixed and I know in the end it will make good numbers.
Ken
Ken, you are describing what psychologists call the 'Stages of SC grief'. Regarding my car, I am putting every go fast part I have (which is most everything) onto a nice short mileage stock block. I'll deal with the race engine on the side. I truly hope you get it figured out. Maybe a clogged injector? Done a balance test yet?
You are not out of injectors, but it had that look to it. Need some useful datalogs. Inj duty cycle vs. MAF voltage would tell an interesting story.
A couple other things that occurred to me that should be looked at.
1) fuel pressure. If it is not rising with boost that will cause difficulty achieving stable AFR and will max injectors very early.
2) Bypass valve. If your bypass valve is not closing or not staying closed under boost for some reason you will never achieve proper boost or power.
I've run into both issues in the past but 15 deg timing is just killing your program. For example I did one dyno pull with 28 deg timing and made 382rwhp and on the next pull accidently left the spout out which locked timing at 10 deg. The car made 275rwhp with no other changes.
A couple other things that occurred to me that should be looked at.
1) fuel pressure. If it is not rising with boost that will cause difficulty achieving stable AFR and will max injectors very early.
2) Bypass valve. If your bypass valve is not closing or not staying closed under boost for some reason you will never achieve proper boost or power.
I definitely see a peak at around 4400 that starts to fall off slowly, why so low of a peak?
You are not out of injectors, but it had that look to it. Need some useful datalogs. Inj duty cycle vs. MAF voltage would tell an interesting story.
A couple other things that occurred to me that should be looked at.
1) fuel pressure. If it is not rising with boost that will cause difficulty achieving stable AFR and will max injectors very early.
2) Bypass valve. If your bypass valve is not closing or not staying closed under boost for some reason you will never achieve proper boost or power.
I've run into both issues in the past but 15 deg timing is just killing your program. For example I did one dyno pull with 28 deg timing and made 382rwhp and on the next pull accidently left the spout out which locked timing at 10 deg. The car made 275rwhp with no other changes.
Because these cars won't run with 15 deg timing. Is no one paying attention?