PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

bucking at low rpms

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Old Apr 27, 2012 | 09:38 AM
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Default bucking at low rpms

I have a 408 with a tx gaint cam with a 112lsa

It bucks hard from idle to about 1500rpms, when I let out the clutch it wants to buck and/or stall unless I raise the rpms high enough to not make it do so, but then it take off hard

Can the tune be adjusted to make it more driveable down low or is this how the cam acts?? (Just swaped to this cam)
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Old Apr 27, 2012 | 01:27 PM
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Its possible that it could be made better (depending on how good your tuner is), but that is a pretty big cam and it isn't gonna like lugging your car around below 1500rpm no matter what you do... I had that cam in a 408 with a TH400 and it was great, but that is way different than an M6...
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Old Apr 27, 2012 | 01:36 PM
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thats a pretty big cam. a tuner (good tuner) could make it a little more streetable but i wouldnt get ur hopes up to making it a low rpm driver
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Old Apr 27, 2012 | 01:38 PM
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Originally Posted by BLK02WS6
Its possible that it could be made better (depending on how good your tuner is), but that is a pretty big cam and it isn't gonna like lugging your car around below 1500rpm no matter what you do... I had that cam in a 408 with a TH400 and it was great, but that is way different than an M6...
What did your idle at?? Mines at 750-800
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Old Apr 27, 2012 | 03:56 PM
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Your cam has alot of overlap...?

To idle that low you would need alpha-N (VE indexed by TP) at the lower rpm's, meaning you would need a COS that provides alpha-N and some sort of transitioning from/to the Main VE.

What software is your tuner using...?
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Old Apr 27, 2012 | 04:40 PM
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Originally Posted by joecar
Your cam has alot of overlap...?

To idle that low you would need alpha-N (VE indexed by TP) at the lower rpm's, meaning you would need a COS that provides alpha-N and some sort of transitioning from/to the Main VE.

What software is your tuner using...?
software is HPtuners and the overlap is 27

Last edited by Blackbird-WS6; Apr 29, 2012 at 01:49 PM.
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Old Apr 27, 2012 | 06:08 PM
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From: on the dyno tuning in MD
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Originally Posted by Blackbird-WS6
What did your idle at?? Mines at 750-800
900rpm
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