Engine hits brick wall
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Junior Member
Joined: Sep 2005
Posts: 64
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From: bellwood PA
Car: 91 z28
Engine: 350
Transmission: T-5
Engine hits brick wall
I'm looking for a few friendly opinions from those who have been there before me. My engine starts to nose over at around 56-5,700 and hits a brick wall right around 6K. With AFR 195's, HSR, and a cc306 cam (230/244). I understand this cam is supposed to be shifted around 6,500 to get the most out of it. I'm suspecting my 5 yr. old stock replacement fuel pump. Thanks in advance.
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Joined: Sep 2004
Posts: 878
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Car: 89' Iroc-Z G92
Engine: TPI 305 G92
Transmission: T-5
Axle/Gears: Limited 9 bolt, 3.45
Originally Posted by z282slo
I'm looking for a few friendly opinions from those who have been there before me. My engine starts to nose over at around 56-5,700 and hits a brick wall right around 6K. With AFR 195's, HSR, and a cc306 cam (230/244). I understand this cam is supposed to be shifted around 6,500 to get the most out of it. I'm suspecting my 5 yr. old stock replacement fuel pump. Thanks in advance.
how about that five year old fuel filter or the ignition module?
hook up a fuel pressure gauge and rev it...
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From: Cypress, California
Car: 1989 GTA
Engine: 369 TPI
Transmission: 4L60E
Axle/Gears: 3.70 Nine Bolt
Right. You may be running out of fuel at the higher rpm's. Your engine may be trying to make more horsepower than the pump can put out.
Last edited by 1989GTATransAm; Apr 6, 2006 at 09:20 PM.
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From: Fla
Car: 90 IROC
Engine: 406
Transmission: GMPP 93/4L60
Axle/Gears: 9 bolt 3.27
fuel/ignition is a good place to start....What are you running for exhaust? A restrictive exhaust will kill the topend.
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Joined: Sep 2005
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From: bellwood PA
Car: 91 z28
Engine: 350
Transmission: T-5
Originally Posted by MikeH
fuel/ignition is a good place to start....What are you running for exhaust? A restrictive exhaust will kill the topend.
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From: Pasadena, MD
Car: '87 Camaro IROC-Z
Engine: 385 HSR
Transmission: 700R4
Axle/Gears: 3.42 posi
If you have the stock AFR springs, you may be running into valve float, which'll act as an internal rev limiter. I know of others with AFR heads that had to swap out the valvesprings due to this problem...
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Originally Posted by z282slo
I'm looking for a few friendly opinions from those who have been there before me. My engine starts to nose over at around 56-5,700 and hits a brick wall right around 6K. With AFR 195's, HSR, and a cc306 cam (230/244). I understand this cam is supposed to be shifted around 6,500 to get the most out of it. I'm suspecting my 5 yr. old stock replacement fuel pump. Thanks in advance.
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Joined: Mar 2000
Posts: 1,692
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From: Corona
Car: 92 Form, 91 Z28, 89 GTA, 86 Z28
Engine: BP383 vortech, BP383, 5.7 TPI, LG4
Transmission: 4L60e, 700R4, 700R4..
Axle/Gears: 3.27, 2.73
I'll second the valve float idea. That really stops a motor from revving. It'll also tend to break valve train components. That's a lot of cam, so I'd really look into new valve-springs first.
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