black cotton
10+ Year Contributor
- 68
- 5
- Mar 2, 2009
-
Naugatuck,
Connecticut
Brief History. I bought my MS2 sequential from Symtech, and when building my harness; un knowingly used Butt Connectors, and Also ran my battery power and ground under my MS Unit.
I obtained a "Idle Tune" from another member to get the vehicle started and made an appointment at a tune shop to be tuned. After a few glitches and a full day on the dyno, they (they dyno shop) told me I needed to rewire the entire harness, and relocate the battery power and grounds away from the MS Unit, and my issue of "mis-firing" under load (trying to build boost) would go away; And that the tune was good enough so that once I fixed these issues, I could put a few miles on the vehicle before returning to complete the tune.
Fast Forward. I just finally got around to rewiring the MS Harness, and relocating the route of my battery power and ground. I fired the vehicle up, let it reach operating temps, and took it for a spin. Same issue. So I decided to hook up my lap top and see if I could data log anything. Here is what I found.
My VE1 table range is 700rpm - 4400rpm (this explains my in ability to rev over 5100 rpm according to Tuner Studio.
On the opposite side of the map i noticed fuel load % was being used instead of Kpa. This range is 30-310. I have no understanding of this value in reference of/to vacuum vs boost.
Also note, I can get the vehicle to rev with no issues to roughly 4800-5k RPM as long as I keep TPS value under 15-20%. Once I apply any more load onto the motor, (try to bring the throttle position over 20%) and engine vac drops to 0, the vehicle will being to "misfire". However In my opinion its flooding out. EGTs will drop to 3-500*F, sending my AEM wideband to "---" and you can literally see gas coming out of the tail pipe. I feel my whole problem is tune related, in regards to flooding out entering into boost, which for my motor/turbo combo should be in that 38-4400rpm range.
Any insight would be great. Thank You.
I obtained a "Idle Tune" from another member to get the vehicle started and made an appointment at a tune shop to be tuned. After a few glitches and a full day on the dyno, they (they dyno shop) told me I needed to rewire the entire harness, and relocate the battery power and grounds away from the MS Unit, and my issue of "mis-firing" under load (trying to build boost) would go away; And that the tune was good enough so that once I fixed these issues, I could put a few miles on the vehicle before returning to complete the tune.
Fast Forward. I just finally got around to rewiring the MS Harness, and relocating the route of my battery power and ground. I fired the vehicle up, let it reach operating temps, and took it for a spin. Same issue. So I decided to hook up my lap top and see if I could data log anything. Here is what I found.
My VE1 table range is 700rpm - 4400rpm (this explains my in ability to rev over 5100 rpm according to Tuner Studio.
On the opposite side of the map i noticed fuel load % was being used instead of Kpa. This range is 30-310. I have no understanding of this value in reference of/to vacuum vs boost.
Also note, I can get the vehicle to rev with no issues to roughly 4800-5k RPM as long as I keep TPS value under 15-20%. Once I apply any more load onto the motor, (try to bring the throttle position over 20%) and engine vac drops to 0, the vehicle will being to "misfire". However In my opinion its flooding out. EGTs will drop to 3-500*F, sending my AEM wideband to "---" and you can literally see gas coming out of the tail pipe. I feel my whole problem is tune related, in regards to flooding out entering into boost, which for my motor/turbo combo should be in that 38-4400rpm range.
Any insight would be great. Thank You.