Car feels weaker after tune, too much timing?
Car feels weaker after tune, too much timing?
I helped my buddy do a build for his GSR. To drive it to the tuner, we used a basemap from Phearable.net
While driving to the tuner, AFR was 12.5-13 at WOT, about 14 at idle and 14-14.5 while cruising. After the street tune, WOT AFR was high 12's to low 13's and about 15 at idle and 15.5-16 cruising. AFR's are better but the car feels like it lost power. The tuner did say he advanced timing a bit throughout most of the powerband. How much is too much timing at WOT and partial throttle. I can post pics if someone can tell me how to host crome files.
While driving to the tuner, AFR was 12.5-13 at WOT, about 14 at idle and 14-14.5 while cruising. After the street tune, WOT AFR was high 12's to low 13's and about 15 at idle and 15.5-16 cruising. AFR's are better but the car feels like it lost power. The tuner did say he advanced timing a bit throughout most of the powerband. How much is too much timing at WOT and partial throttle. I can post pics if someone can tell me how to host crome files.
Re: Car feels weaker after tune, too much timing?
I helped my buddy do a build for his GSR. To drive it to the tuner, we used a basemap from Phearable.net
While driving to the tuner, AFR was 12.5-13 at WOT, about 14 at idle and 14-14.5 while cruising. After the street tune, WOT AFR was high 12's to low 13's and about 15 at idle and 15.5-16 cruising. AFR's are better but the car feels like it lost power. The tuner did say he advanced timing a bit throughout most of the powerband. How much is too much timing at WOT and partial throttle. I can post pics if someone can tell me how to host crome files.
While driving to the tuner, AFR was 12.5-13 at WOT, about 14 at idle and 14-14.5 while cruising. After the street tune, WOT AFR was high 12's to low 13's and about 15 at idle and 15.5-16 cruising. AFR's are better but the car feels like it lost power. The tuner did say he advanced timing a bit throughout most of the powerband. How much is too much timing at WOT and partial throttle. I can post pics if someone can tell me how to host crome files.
Advancing the timing wouldn't cause the car to loose power in most cases.
I doubt the timing needed to be advanced on one of our all motor basemaps but that all depends on if your distributor timing was synced to the ecu.
Do you have a dyno sheet? If so, post it.
Re: Car feels weaker after tune, too much timing?
Sounds like the basemap was almost spot on!
Advancing the timing wouldn't cause the car to loose power in most cases.
I doubt the timing needed to be advanced on one of our all motor basemaps but that all depends on if your distributor timing was synced to the ecu.
Do you have a dyno sheet? If so, post it.
Advancing the timing wouldn't cause the car to loose power in most cases.
I doubt the timing needed to be advanced on one of our all motor basemaps but that all depends on if your distributor timing was synced to the ecu.
Do you have a dyno sheet? If so, post it.
Yeah, your basemap is pretty damn close to what I was looking for. He set idle ignition to 17.5 on the crome table, when I shot the timing with a gun it was bouncing from 16-18. Would that 1.5 degree affect overall performance much?
Re: Car feels weaker after tune, too much timing?
1.5 degrees wouldn't be a world of a difference maybe 3-5 whp if your lucky.
You really should have spent your money on a dyno tune.
A street tune was pointless considering your air fuel ratios were almost perfect on our basemap.
You really should have spent your money on a dyno tune.
A street tune was pointless considering your air fuel ratios were almost perfect on our basemap.
Sorry John, no dyno, just street tuned on crome, using a PLX wideband and autometer vacuum gauge.
Yeah, your basemap is pretty damn close to what I was looking for. He set idle ignition to 17.5 on the crome table, when I shot the timing with a gun it was bouncing from 16-18. Would that 1.5 degree affect overall performance much?
Yeah, your basemap is pretty damn close to what I was looking for. He set idle ignition to 17.5 on the crome table, when I shot the timing with a gun it was bouncing from 16-18. Would that 1.5 degree affect overall performance much?
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