Help Wanted on a Tuned C5 Supercharged
Thread Starter
4th Gear
Joined: May 2010
Posts: 4
Likes: 0
Help Wanted on a Tuned C5 Supercharged
Hallo guys,
my name is Mario and i have a problem on my own C5 ´98.
Car is equipped with A&A Supercharged system (3.6 Pulley), exhaust sytem with 100cell race cats, Borla exhaust, oil cooler etc....
Car was running fine everything was ok. I am equipped with HPTuners.
We are driven with 10psi (6000rpm), 11.2 AFR, 15° advance in high rpm.
No knocking, 550HP on engine, 702 NM.
In winter we istalled a sharper camshaft and a boost a pump (for safety) and we tested the Vette last week.
Car performance is good until 5200rpm (530HP, 700NM) above 5200 the curve drops rapidly and you feel on dyno that car loose a lot of power.
Fueling is still between 11.2 and 11.5, but we have 10° knocking exact when power drops. Timing is only 0 to 3 ° in this power loss area.
Car is setup with 1 bar MAP sensor and we work with stock MAF.
But we can not hear any knocking noises.
For any pro help i am happy.
Thanks
regards,
mario
my name is Mario and i have a problem on my own C5 ´98.
Car is equipped with A&A Supercharged system (3.6 Pulley), exhaust sytem with 100cell race cats, Borla exhaust, oil cooler etc....
Car was running fine everything was ok. I am equipped with HPTuners.
We are driven with 10psi (6000rpm), 11.2 AFR, 15° advance in high rpm.
No knocking, 550HP on engine, 702 NM.
In winter we istalled a sharper camshaft and a boost a pump (for safety) and we tested the Vette last week.
Car performance is good until 5200rpm (530HP, 700NM) above 5200 the curve drops rapidly and you feel on dyno that car loose a lot of power.
Fueling is still between 11.2 and 11.5, but we have 10° knocking exact when power drops. Timing is only 0 to 3 ° in this power loss area.
Car is setup with 1 bar MAP sensor and we work with stock MAF.
But we can not hear any knocking noises.
For any pro help i am happy.
Thanks
regards,
mario
Le Mans Master
Joined: May 2006
Posts: 7,857
Likes: 242
From: Hillsboro OR
My Coupe is not supercharged but, when my cars power died on the dyno (at ~ 5200 rpm), I found out I had carbon build-up. We did a quick test on the dyno with the knock sensor disabled (to verify the sensor was good), and the power drop still happened. A couple of Seafoam treatments later and all was good again. Hope that helps. 
Team Owner
Joined: May 2003
Posts: 23,480
Likes: 9
From: East Meadow NY
St. Jude Donor '12
Can you post the dynograph? When you added the cam, did you upgrade the valve springs? I recall some people having problems in that RPM range as the stock springs were not good enough and the power was dropping off.
Thread Starter
4th Gear
Joined: May 2010
Posts: 4
Likes: 0
.
@ Bluefire
did you disable the knock sensor manually or have you done by HpTuners ?
when HPTuners what Menu i have choose. Thanks for help.
@ chaase
I will post the dynosheet tomorrow morning (european time).
Yes we changed the springs with cam.
Friend of mine in Dubai has done this setup on some other supercharged C5 w/o this failure.
Should i send you also the log from HPTuners ?
regards
Mario
did you disable the knock sensor manually or have you done by HpTuners ?
when HPTuners what Menu i have choose. Thanks for help.
@ chaase
I will post the dynosheet tomorrow morning (european time).
Yes we changed the springs with cam.
Friend of mine in Dubai has done this setup on some other supercharged C5 w/o this failure.
Should i send you also the log from HPTuners ?
regards
Mario
Team Owner
Joined: May 2003
Posts: 23,480
Likes: 9
From: East Meadow NY
St. Jude Donor '12
@ Bluefire
did you disable the knock sensor manually or have you done by HpTuners ?
when HPTuners what Menu i have choose. Thanks for help.
@ chaase
I will post the dynosheet tomorrow morning (european time).
Yes we changed the springs with cam.
Friend of mine in Dubai has done this setup on some other supercharged C5 w/o this failure.
Should i send you also the log from HPTuners ?
regards
Mario
did you disable the knock sensor manually or have you done by HpTuners ?
when HPTuners what Menu i have choose. Thanks for help.
@ chaase
I will post the dynosheet tomorrow morning (european time).
Yes we changed the springs with cam.
Friend of mine in Dubai has done this setup on some other supercharged C5 w/o this failure.
Should i send you also the log from HPTuners ?
regards
Mario
Le Mans Master
Joined: May 2006
Posts: 7,857
Likes: 242
From: Hillsboro OR
@ Bluefire
did you disable the knock sensor manually or have you done by HpTuners ?
when HPTuners what Menu i have choose. Thanks for help.
@ chaase
I will post the dynosheet tomorrow morning (european time).
Yes we changed the springs with cam.
Friend of mine in Dubai has done this setup on some other supercharged C5 w/o this failure.
Should i send you also the log from HPTuners ?
regards
Mario
did you disable the knock sensor manually or have you done by HpTuners ?
when HPTuners what Menu i have choose. Thanks for help.
@ chaase
I will post the dynosheet tomorrow morning (european time).
Yes we changed the springs with cam.
Friend of mine in Dubai has done this setup on some other supercharged C5 w/o this failure.
Should i send you also the log from HPTuners ?
regards
Mario
Team Owner
Joined: May 2003
Posts: 23,480
Likes: 9
From: East Meadow NY
St. Jude Donor '12
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Thread Starter
4th Gear
Joined: May 2010
Posts: 4
Likes: 0
.
Hallo guys,
i have done today some runs on my Vette on dyno.
i disconnect the MAF & have setted the VE tables primary & secondarry to a good AFR.
Knocking was only 3° anymore over 5400rpm.
So i have found the problem stock MAF is not OK.
My question now:
Should i put inside a bigger MAF or should i convert to a Speed Density tune with 2 bar MAP sesor ?
what timing advance you do on supercharged Vettes from 4500 to 6000 ?
Thanks for your helping hands.
br
mario
i have done today some runs on my Vette on dyno.
i disconnect the MAF & have setted the VE tables primary & secondarry to a good AFR.
Knocking was only 3° anymore over 5400rpm.
So i have found the problem stock MAF is not OK.
My question now:
Should i put inside a bigger MAF or should i convert to a Speed Density tune with 2 bar MAP sesor ?
what timing advance you do on supercharged Vettes from 4500 to 6000 ?
Thanks for your helping hands.
br
mario
