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Old 05-31-2023, 02:57 PM   #1
MartinLe
 
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Drives: 2017 Chevrolet Camaro ZL1 M6
Join Date: Jul 2020
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Negative Torque tables at Idle??

dyno1.pdf

dyno2.pdf

Hey Guys, thought I'd post my numbers after the blower/cam install. The previous number of 808hp came from a Mustang.

On another note, I have noticed that the car has been idling high - 700 commanded, ~860 indicated. I brought this up to the dyno guy and he said he noticed it. He also said the torque tables at idle were showing a negative value, and that might have something to do with the high idle. Or, maybe a small vacuum leak. No CEL showing.

I would be grateful for any thoughts before I sign an open check to fix the problem.
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JRE Terminator Rough Idle Cam
Magnuson 2650 - 15% lower, 90mm upper
FIC+30%
DSX Flex fuel/Low side
NW 103mm TB/Roto-Fab CAI
Monster S Series
Elite E2-X
2" TSP LT's
BMR:BK063, BK060,TCA061, UTCA060, UTCA063
Weld Beadlocks/17" NT5R2

Last edited by MartinLe; 06-01-2023 at 11:56 AM. Reason: change header
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Old 05-31-2023, 06:13 PM   #2
Camfab
 
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Nice numbers!
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Old 06-01-2023, 07:36 AM   #3
JSH


 
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Quote:
Originally Posted by MartinLe View Post
Attachment 1128054

Attachment 1128055

Hey Guys, thought I'd post my numbers after the blower/cam install. The previous number of 808hp came from a Mustang.

On another note, I have noticed that the car has been idling high - 700 commanded, ~860 indicated. I brought this up to the dyno guy and he said he noticed it. He also said the torque tables at idle were showing a negative value, and that might have something to do with the high idle. Or, maybe a small vacuum leak. No CEL showing.

I would be grateful for any thoughts before I sign an open check to fix the problem.
Keep going. You need to find another 50 hp somewhere like fuel/timing advance.
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'20 ZL1 1LE A10,
OEM short block, LME heads/valve train, E2650.
100+ octanes, no eth, no meth, no N2O.
2/23 - 1031/1004 wheel.
4/23 - 1.41/9.61/145 at DA 7000 ft. (only made five passes).
2/24 - LME 390, E2650, FBO, 100 oct.; 1116hp/ 1063tq; 109 oct. dyno next.
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Old 06-01-2023, 09:17 AM   #4
LiqTenExp

 
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Quote:
Originally Posted by MartinLe View Post
Attachment 1128054

Attachment 1128055

Hey Guys, thought I'd post my numbers after the blower/cam install. The previous number of 808hp came from a Mustang.

On another note, I have noticed that the car has been idling high - 700 commanded, ~860 indicated. I brought this up to the dyno guy and he said he noticed it. He also said the torque tables at idle were showing a negative value, and that might have something to do with the high idle. Or, maybe a small vacuum leak. No CEL showing.

I would be grateful for any thoughts before I sign an open check to fix the problem.
You should be somewhere in the single digit positive degrees of timing at idle. At negative timing you will be excessively heating up your exhaust manifolds/headers. Are you doing the tuning? I can help or watch Goat Rope Garage youtube video on this. It is pulling timing to the bottom of the timing table right now trying to reach 700, you need to adjust both modes of virtual torque tables at idle so that the requested is inline with actual. Right now I bet the torque tables requested are lower than actual.
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Old 06-01-2023, 11:54 AM   #5
MartinLe
 
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Quote:
Originally Posted by LiqTenExp View Post
You should be somewhere in the single digit positive degrees of timing at idle. At negative timing you will be excessively heating up your exhaust manifolds/headers. Are you doing the tuning? I can help or watch Goat Rope Garage youtube video on this. It is pulling timing to the bottom of the timing table right now trying to reach 700, you need to adjust both modes of virtual torque tables at idle so that the requested is inline with actual. Right now I bet the torque tables requested are lower than actual.
Thank you for the thoughts. First things first, I thought this would get more attention. Probably should have used a different header (I might change it). Anyhow, my concern is why the torque tables are negative. Jannetty is the only one to tune the car, so far. I don't think he set the tables like this. I don't see how they can change by themselves. The dyno guy - I think - said it was like ~-140. I hit up Ted with this question and he wants me to pay for another tuning session. If I read the website correctly, that's another $700 for my mod set. If I have to, I have to, but damn! But, on the other hand, I am much intimidated with the thought of modifying those tables. Do you think it could be a vacuum leak as the dyno guy mentioned as a possible reason?
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JRE Terminator Rough Idle Cam
Magnuson 2650 - 15% lower, 90mm upper
FIC+30%
DSX Flex fuel/Low side
NW 103mm TB/Roto-Fab CAI
Monster S Series
Elite E2-X
2" TSP LT's
BMR:BK063, BK060,TCA061, UTCA060, UTCA063
Weld Beadlocks/17" NT5R2
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