Forced Induction Superchargers | Turbochargers | Intercoolers

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Old

Jun 24, 2009 | 06:28 AM

#1

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From: Germany

Angry

no Boost

so far I'm almost done with my SC install and all that goes with it, after firing it up I realised that I'm not making any Boost. If I remove the tube from the SC to the TB I can feel it blowing pretty strong.
Its a Paxton Novi2000
I have a 6.8 Balancer and a 2.75 pulley so Impeller Speed at 6200rpm should be 53650 (6.8:2.75x6200x3.5)
Paxton says max. Impeller speed is 55000 so I'm already close to the max.
I also Installed a LS6 Intake and a CompCams Xr269 with 1.8 rockers
could it be that the Intake is leaking somewhere, or is the cam not good for use with a SC, but I think its a pretty mild cam.
what could cause the problem?

Old

Jun 24, 2009 | 07:55 AM

#2

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No boost when its idling? If so that is good.

You should see vacuum when there is no load on the engine.

Old

Jun 24, 2009 | 08:55 AM

#3

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at idle I have Vacuum -18 at 2000, 3000 and 4000 I have Vacuum of -20

Old

Jun 24, 2009 | 09:12 AM

#4

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Quote:

Originally Posted by LS1AC-Cobra

at idle I have Vacuum -18 at 2000, 3000 and 4000 I have Vacuum of -20

Is the gauge installed correctly? At 4000 RPMs there should be way less vacuum even with a NA motor.

Old

Jun 24, 2009 | 09:33 AM

#5

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the gauge is connected in the rear of the intake just underneath the MAP-Sensor

Old

Jun 24, 2009 | 09:37 AM

#6

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btw, I was not driving the car when I checked the vacuum
when there's load on the engine I think then its way less

Old

Jun 24, 2009 | 04:52 PM

#7

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It's unlikely you will make much if any boost just free reving, engine needs load.

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Old

Jun 24, 2009 | 05:08 PM

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You won't hardly make any boost in Park/Neutral, you need to get it out on the street.

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Old

Jun 25, 2009 | 04:13 AM

#9

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ok guys, I'll try and get the rest of the things sorted out and then I take her out for a spin, lets see what happens....

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