Car falls on its face at 4000 rpm
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Joined: Sep 2001
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From: Mechanicsburg,Pa usa
Car: 92'Camaro RS
Engine: a loud one
Transmission: bolted to the engine
Car falls on its face at 4000 rpm
Seems like at around 4000 rpm's in almost every gear the car falls on its face. Any ideas on how to modify this problem???? MSD 6A ignition mabey????? Any help ????
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92' Camaro RS/Black,T-tops/350 TBI Targetmaster Comp.engine/5 spd/march underdrive pulleys/hedman hedders/3" dynomax exaust/hyper tech stage 2 chip/3.42 gears/K&N air filter/MSD blaster GM coil.......currently setting in my garage impatiently waiting for installation....TPI !!!!!
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92' Camaro RS/Black,T-tops/350 TBI Targetmaster Comp.engine/5 spd/march underdrive pulleys/hedman hedders/3" dynomax exaust/hyper tech stage 2 chip/3.42 gears/K&N air filter/MSD blaster GM coil.......currently setting in my garage impatiently waiting for installation....TPI !!!!!
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Joined: Jul 1999
Posts: 17,268
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From: 51°N 114°W, 3500'
Car: 87 IROC L98
Engine: 588 Alcohol BBC
Transmission: Powerglide
Axle/Gears: Ford 9"/31 spline spool/4.86
Fuel or weak valve springs.
First thing to do is change the fuel filter. You not only need pressure but at high rpms, you need volume. It could be a lack of fuel. If you can mount a fuel pressure gauge where you can see it while driving, check the fuel pressure at 4000 rpm. TBI should be in the 12-14 psi range. If it's dropping below 9 at 4000 rpm then there's not enough volume to feed the injectors.
Is the cam and valve springs still stock? The valve springs could be worn out and are starting to cause the valves to float at lower rpms.
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Follow my racing progress on Stephen's racing page
and check out the race car
87 IROC-Z SuperPro ET Bracket Race Car
461 naturally aspirated Big Block (times are for the current engine)
Best ET on a time slip: 11.447 altitude corrected to 10.99
Best MPH on a time slip: 119.42 altitude corrected to 124.86
Altitude corrected rear wheel HP: 493
Best 60 foot: 1.586
Racing at 3500 feet elevation with a typical race day over 5000 feet density altitude!
Member of the Calgary Drag Racing Association
87 IROC bracket car, 91 454SS daily driver, 95 Homebuilt Harley
First thing to do is change the fuel filter. You not only need pressure but at high rpms, you need volume. It could be a lack of fuel. If you can mount a fuel pressure gauge where you can see it while driving, check the fuel pressure at 4000 rpm. TBI should be in the 12-14 psi range. If it's dropping below 9 at 4000 rpm then there's not enough volume to feed the injectors.
Is the cam and valve springs still stock? The valve springs could be worn out and are starting to cause the valves to float at lower rpms.
------------------
Follow my racing progress on Stephen's racing page
and check out the race car
87 IROC-Z SuperPro ET Bracket Race Car
461 naturally aspirated Big Block (times are for the current engine)
Best ET on a time slip: 11.447 altitude corrected to 10.99
Best MPH on a time slip: 119.42 altitude corrected to 124.86
Altitude corrected rear wheel HP: 493
Best 60 foot: 1.586
Racing at 3500 feet elevation with a typical race day over 5000 feet density altitude!
Member of the Calgary Drag Racing Association
87 IROC bracket car, 91 454SS daily driver, 95 Homebuilt Harley
Thread Starter
Senior Member
iTrader: (1)
Joined: Sep 2001
Posts: 643
Likes: 0
From: Mechanicsburg,Pa usa
Car: 92'Camaro RS
Engine: a loud one
Transmission: bolted to the engine
No this engine is a new crate motor and only has 5000 miles on it...I think you have helped though. I am sure it is because when i put the 350 in i used the stock 305 and intake and throttle body. I am sure the fuel nozzles are producing not enough fuel to feed the engine.. This might be the answer?? Thanks for the help!! Switching to tuned port soon so all my woo's should be over very soon.
[This message has been edited by david roush (edited October 04, 2001).]
[This message has been edited by david roush (edited October 04, 2001).]
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