I could really use some help.
Okay so I recently got my motor back together, and I was thinking that my 40% injectors would be my limiting factor. After watching a couple of these dyno pulls, something else is either fueling too hard or not allowing it to clean up. Thought it was my MAF reading 80g/s at idle but I swapped it with a working maf and it still read the same. (Could be tuning related so I'm getting it rescaled)
So here goes my situation:
S475/83/.90, 40% injectors, stock dual pumps, and I my tunes are 1800us, 2100us, 2400us, 2600us, and 2800us. My 2600 and 2800 tunes build around 50 psi of boost.
I had a retune done by another tuner and it made around 750 on the dyno, but the second we got on the street it had a terrible timing rattle and it smoked grey because there was so much fuel. Would kill my turbo when I'm at WOT if I didn't help it get spooled. He said he couldn't find anything in the tune that would add timing like that since it was at way more timing than what it commanded in the tune. With the same tunes, if I unplugged my MAF sensor it would jump instantly to 25* timing once I passed a certain throttle position.
Changed back to my original tunes (in the dyno video) and they make power, but don't really clean up on the street or dyno. They still have a bad timing rattle but not as bad as my other tunes.
My question is am I just asking too much out of this turbo, or is there another issue I'm overlooking.
First 3 runs I hit a speed limiter and didn't find out till the last run, so the last run goes through a better rpm curve. (3000-4600)
https://www.facebook.com/story.php?story_fbid=10206804619659931&id=100006760412374
Did 667hp today, and have had a couple 750hp dyno's in the past week or so. Maybe I am expecting too much out of my truck but comparing the dyno numbers to other similar trucks (friends lbz did 750ish on the same dyno with 30% overs and a 2650 us tune, but even smaller turbo, and it cleans up the fuel.)
Sent from my iPhone using Tapatalk
Okay so I recently got my motor back together, and I was thinking that my 40% injectors would be my limiting factor. After watching a couple of these dyno pulls, something else is either fueling too hard or not allowing it to clean up. Thought it was my MAF reading 80g/s at idle but I swapped it with a working maf and it still read the same. (Could be tuning related so I'm getting it rescaled)
So here goes my situation:
S475/83/.90, 40% injectors, stock dual pumps, and I my tunes are 1800us, 2100us, 2400us, 2600us, and 2800us. My 2600 and 2800 tunes build around 50 psi of boost.
I had a retune done by another tuner and it made around 750 on the dyno, but the second we got on the street it had a terrible timing rattle and it smoked grey because there was so much fuel. Would kill my turbo when I'm at WOT if I didn't help it get spooled. He said he couldn't find anything in the tune that would add timing like that since it was at way more timing than what it commanded in the tune. With the same tunes, if I unplugged my MAF sensor it would jump instantly to 25* timing once I passed a certain throttle position.
Changed back to my original tunes (in the dyno video) and they make power, but don't really clean up on the street or dyno. They still have a bad timing rattle but not as bad as my other tunes.
My question is am I just asking too much out of this turbo, or is there another issue I'm overlooking.
First 3 runs I hit a speed limiter and didn't find out till the last run, so the last run goes through a better rpm curve. (3000-4600)
https://www.facebook.com/story.php?story_fbid=10206804619659931&id=100006760412374
Did 667hp today, and have had a couple 750hp dyno's in the past week or so. Maybe I am expecting too much out of my truck but comparing the dyno numbers to other similar trucks (friends lbz did 750ish on the same dyno with 30% overs and a 2650 us tune, but even smaller turbo, and it cleans up the fuel.)
Sent from my iPhone using Tapatalk
