Nitrous problems C7 Z
Thread Starter
5th Gear
Joined: May 2019
Posts: 5
Likes: 0
Nitrous problems C7 Z
Hello im new to the forum, I own a 2019 auto c7z I will start off by mentioning all mods done to the car
Texas speed heads and stage 2 cam
2” headers
halltech intake
kong ported blower and tb
dual nozzle alky kit
Heat exchanger
expansion tank
mm catch can
nitrous outlet plate kit
flex fuel kit (dsm lights tuned)
hp tuners tcm unlocked
best number so far on blower is 791whp (dyno jet)
on nitrous pulls are where the numbers don’t add up, so we started off by hiting it with a 200, only gained 80whp off that jetting, dropped down to 150 shot jetting and still got 80whp Gain, then dropped down to a 100 shot jetting and got a true 100whp gain, initially we thought the bottle wasn’t properly filled but after 4 different bottles that is ruled out, then we pulled the plate out and looked for restriction and it seems fine, at this point we are pretty bummed out on why this car won’t make anything over than 100whp gain, any opinions and thoughts would be greatly appreciated. Thanks
Texas speed heads and stage 2 cam
2” headers
halltech intake
kong ported blower and tb
dual nozzle alky kit
Heat exchanger
expansion tank
mm catch can
nitrous outlet plate kit
flex fuel kit (dsm lights tuned)
hp tuners tcm unlocked
best number so far on blower is 791whp (dyno jet)
on nitrous pulls are where the numbers don’t add up, so we started off by hiting it with a 200, only gained 80whp off that jetting, dropped down to 150 shot jetting and still got 80whp Gain, then dropped down to a 100 shot jetting and got a true 100whp gain, initially we thought the bottle wasn’t properly filled but after 4 different bottles that is ruled out, then we pulled the plate out and looked for restriction and it seems fine, at this point we are pretty bummed out on why this car won’t make anything over than 100whp gain, any opinions and thoughts would be greatly appreciated. Thanks
Drifting
Joined: Apr 2015
Posts: 1,276
Likes: 317
Do you have a log of those dyno runs? Was the throttle at 100% during the entire pass and did you see commanded spark advance? And you will need to work that trans tune to be happy with the spray, along with the torque tables in the ECU. Reported torque has to at least be close, or that a8 won’t live happily ever after.
Thread Starter
5th Gear
Joined: May 2019
Posts: 5
Likes: 0
Do you have a log of those dyno runs? Was the throttle at 100% during the entire pass and did you see commanded spark advance? And you will need to work that trans tune to be happy with the spray, along with the torque tables in the ECU. Reported torque has to at least be close, or that a8 won’t live happily ever after.
Team Owner
Joined: Aug 2011
Posts: 21,587
Likes: 1,614
From: GREER SC
Do you have a purge on it? If so, does it look like it's working, flowing, correctly? I had a restriction in my main feed line that it took us quite some time to locate. It was giving similar issues to what you are describing.
Thread Starter
5th Gear
Joined: May 2019
Posts: 5
Likes: 0
It does have a purge, I’d have to have the shop check that out.
Pro
Joined: Nov 2015
Posts: 564
Likes: 147
From: San Antonio Texas
Where are you getting fuel from?? Stand alone tank? Surely your not hitting it with a dry shot. Are you? Something is definitely wrong. When I sprayed mine a 100shot would net 150ish a 150netted 225 and a 200shot gave us 300hp even. These were wet shots thru spray bars on the lid.
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Melting Slicks
Joined: Sep 2004
Posts: 3,153
Likes: 114
Where are you getting fuel from?? Stand alone tank? Surely your not hitting it with a dry shot. Are you? Something is definitely wrong. When I sprayed mine a 100shot would net 150ish a 150netted 225 and a 200shot gave us 300hp even. These were wet shots thru spray bars on the lid.
Pro
Joined: Nov 2015
Posts: 564
Likes: 147
From: San Antonio Texas
