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GTM supercharger install on G37 Vert

Originally Posted by Fezzik Just an update. Sam has been in constant contact with me. I've had a cold start issue and a heat soak issue. NOt a big deal,

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Old 10-30-2010, 10:14 PM   #76 (permalink)
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Originally Posted by Fezzik View Post
Just an update. Sam has been in constant contact with me. I've had a cold start issue and a heat soak issue. NOt a big deal, i just have to give it a little gas to start. Sam is also working on the solution to the fluttering and will send out a fix when he has it. I"m going to try to do a few more runs for sam to gather data if efuseakay is free
David is it a hot or a cold start issue that you are having ? I understood it was when the car is cold witch We had never ran into a cold start issue before, might not be a bad idea to verify the fuel pump install and even checking base fuel press, The map i sent you was based on 18 Celsius coolant temp starting problem.

Let me know.

Sam

Last edited by SAM@GTM; 10-30-2010 at 10:25 PM.
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Old 10-31-2010, 11:26 AM   #77 (permalink)
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Sorry I couldn't come out last night. Hope you still had a chance to log more data!
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Old 11-01-2010, 03:33 PM   #78 (permalink)
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No prob Jeff. I have done a few runs. I have been monitoring boost. the vaccum stays at -20 until i get on it and boost goes up to a pinch under 9 psi. So far the car is running well. I'm having to learn to drive the car all over again with this much torque and power. I've seen the VDC go off as much in the last week as I have in my whole life of owning cars with VDC.

My power steering is groaning ever so slightly. I think I have a small kink in the return line from the power steering pump to the resevoir. I'm going to put a new hose on ther eand see if that helps. My theory is that if fluid cant be pushed out enough then that can cause the groan.
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Old 11-04-2010, 07:58 PM   #79 (permalink)
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Well. I put in the forged bypass valve with 3 different springs. Still fluttering. I tried extending the hose, That helped a little but not solved.
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Old 11-04-2010, 08:01 PM   #80 (permalink)
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Well. I put in the forged bypass valve with 3 different springs. Still fluttering. I tried extending the hose, That helped a little but not solved.
Damn, I was hoping the Forged bypass valve would solve the problem.
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Old 11-04-2010, 08:07 PM   #81 (permalink)
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damn sorry to hear...hopefully Sam comes up with a fix as his car has absolutely no flutter whatsoever..
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Old 11-04-2010, 08:38 PM   #82 (permalink)
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Well. I put in the forged bypass valve with 3 different springs. Still fluttering. I tried extending the hose, That helped a little but not solved.
Damn, sorry to hear that. Thanks for the info, though.
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Old 11-04-2010, 09:41 PM   #83 (permalink)
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Yeah. Sam is working on the fix after sema this week

Thought I'd try and see if it work
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Old 11-05-2010, 12:54 AM   #84 (permalink)
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Old 11-05-2010, 06:55 AM   #85 (permalink)
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Is that what slightly helped?
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Old 11-05-2010, 08:43 AM   #86 (permalink)
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yes it is. It helped a little, but its still there.
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Old 11-05-2010, 08:57 AM   #87 (permalink)
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Are you building any boost when the fluttering occurs? Maybe a softer spring than what comes with the Forge DV might help.
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Old 11-05-2010, 10:15 AM   #88 (permalink)
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Did you noticed any changes on the low end after installing the new bypass valve? Like your idling being more jumpy and does it backfires?
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Old 11-05-2010, 10:26 AM   #89 (permalink)
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The fluttering is happening between -5vac to 0...it happens in decel, shifts, and when your on the throttle about 5-15%. I originally thought it was more but its not. Any more than that and its gone once boost starts to build.

Most likely its a positioning thing. The fact that he reduced it a bit by adding the longer tube kind-of tells me a dual setup or one up by the TBs would do the trick.

Whats important here is that drivability, power delivery, and the overall tune is as OEM feeling as you can get!
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Old 11-05-2010, 10:55 AM   #90 (permalink)
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The fluttering is happening between -5vac to 0...it happens in decel, shifts, and when your on the throttle about 5-15%. I originally thought it was more but its not. Any more than that and its gone once boost starts to build.

Most likely its a positioning thing. The fact that he reduced it a bit by adding the longer tube kind-of tells me a dual setup or one up by the TBs would do the trick.

Whats important here is that drivability, power delivery, and the overall tune is as OEM feeling as you can get!
Can the bpv spring might be too soft if it's bypassing during acceleration. possibly?
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