84 crossfire mod help
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Joined: May 2014
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From: Indianapolis Indiana
84 crossfire mod help
i am looking to boost my performance on my stock 84 engine. i know about the 85 fuel pump but need to know where to do the fuel regulator on the rear tb. how much would it cost to port the intake and any other parts you recommend like cam and gears
Burning Brakes
Joined: Feb 2013
Posts: 1,173
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From: norway
First : port manifol , better fuel pump, 10 deg.timing ,1,6 rr, better cat back, kn filter, air mod , headers and do a full tune ! ........... not happy then get a new cam and better heads , ( PICS. OF A PORTED MANIFOIL IN MY ALBUM )
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From: Indianapolis Indiana
When i bought it for 4g from a family friend who has some pretty fast cars said it was fully tuned up and then it sat for 2 years before i got it ive already changed spark plugs and distributor cap and rotor, in the process of rebuilding my tbs i just need to buy the sensors, do you know where i could get the spring in the fuel pressure regulator if it needs to be replaced.
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From: Indianapolis Indiana
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From: Compound in the Grove, Ga.
2026 Corvette of the Year Finalist - Unmodified
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St. Jude Donor '16
Some great tips here
http://forums.corvetteforum.com/c3-t...solutions.html
My ported CFI Intake on my 82
http://forums.corvetteforum.com/c3-t...solutions.html
My ported CFI Intake on my 82
Burning Brakes
Joined: Feb 2013
Posts: 1,173
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From: norway
Some great tips here
http://forums.corvetteforum.com/c3-t...solutions.html
My ported CFI Intake on my 82
http://forums.corvetteforum.com/c3-t...solutions.html
My ported CFI Intake on my 82
Team Owner
Joined: Aug 2004
Posts: 21,543
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From: Park City Utah
The new fuel pump won't change the fuel pressure (unless your stock pump couldn't meet demand anymore). The regulator is what controls pressure. Turn the adjusting screw on the bottom of the regulator CCW to increase pressure.
Burning Brakes
Joined: Jul 2013
Posts: 1,027
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From: Granite City Illinois
You don't need to weld on a pressure gauge. That is a nice/handy mod, but not necessary. Between the passenger's side frame rail and the engine, there is a rubber line for the fuel. "T" into that line (or make a temp replacement w/a "T" in it. Attache your pressure gauge there.
The new fuel pump won't change the fuel pressure (unless your stock pump couldn't meet demand anymore). The regulator is what controls pressure. Turn the adjusting screw on the bottom of the regulator CCW to increase pressure.
The new fuel pump won't change the fuel pressure (unless your stock pump couldn't meet demand anymore). The regulator is what controls pressure. Turn the adjusting screw on the bottom of the regulator CCW to increase pressure.
Race Director
Joined: Feb 2002
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From: Compound in the Grove, Ga.
2026 Corvette of the Year Finalist - Unmodified
2025 C4 of the Year Winner - Unmodified
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2020 C3 of the Year Finalist - Unmodified
2019 C4 of Year Finalist (performance mods)
2018 C4 of Year Finalist
2015 C4 of the Year Finalist
St. Jude Donor '16
12-13 psi. If I'm wrong someone will correct me 
From the link above post.
...82 pump pushes volume of 9-13 psi. The engine likes around 12. The pressure is set by the regulator spring in the driver side TBI. Under load (or as the pump weakens) the volume starts to drop, fuel supply is not enough to keep up with the RPM's. Once it drops below 9 psi the motor starts to hesitate and loss power at higher RPM.
...The 85 pump pushes volume at 40 psi. Well above the 12 psi the spring is set at. The spring will step down the volume to 12 easily. And because the 85 pump is so far above the 12 your TBI's will always get 12. A weakening 85 pump has a long way to go before it can not deliver enough. The other advantage is you can pop the cap on the regulator spring and dial it up a bit. Some have gone as high as 14-15 psi."
From the link above post.
...82 pump pushes volume of 9-13 psi. The engine likes around 12. The pressure is set by the regulator spring in the driver side TBI. Under load (or as the pump weakens) the volume starts to drop, fuel supply is not enough to keep up with the RPM's. Once it drops below 9 psi the motor starts to hesitate and loss power at higher RPM.
...The 85 pump pushes volume at 40 psi. Well above the 12 psi the spring is set at. The spring will step down the volume to 12 easily. And because the 85 pump is so far above the 12 your TBI's will always get 12. A weakening 85 pump has a long way to go before it can not deliver enough. The other advantage is you can pop the cap on the regulator spring and dial it up a bit. Some have gone as high as 14-15 psi."
Last edited by FASTAZU; May 10, 2014 at 01:27 PM.
Burning Brakes
Joined: Feb 2013
Posts: 1,173
Likes: 152
From: norway
12-13 psi. If I'm wrong someone will correct me
From the link above post.
...82 pump pushes volume of 9-13 psi. The engine likes around 12. The pressure is set by the regulator spring in the driver side TBI. Under load (or as the pump weakens) the volume starts to drop, fuel supply is not enough to keep up with the RPM's. Once it drops below 9 psi the motor starts to hesitate and loss power at higher RPM.
...The 85 pump pushes volume at 40 psi. Well above the 12 psi the spring is set at. The spring will step down the volume to 12 easily. And because the 85 pump is so far above the 12 your TBI's will always get 12. A weakening 85 pump has a long way to go before it can not deliver enough. The other advantage is you can pop the cap on the regulator spring and dial it up a bit. Some have gone as high as 14-15 psi."
From the link above post.
...82 pump pushes volume of 9-13 psi. The engine likes around 12. The pressure is set by the regulator spring in the driver side TBI. Under load (or as the pump weakens) the volume starts to drop, fuel supply is not enough to keep up with the RPM's. Once it drops below 9 psi the motor starts to hesitate and loss power at higher RPM.
...The 85 pump pushes volume at 40 psi. Well above the 12 psi the spring is set at. The spring will step down the volume to 12 easily. And because the 85 pump is so far above the 12 your TBI's will always get 12. A weakening 85 pump has a long way to go before it can not deliver enough. The other advantage is you can pop the cap on the regulator spring and dial it up a bit. Some have gone as high as 14-15 psi."
14 psi on my car !
Team Owner
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From: Park City Utah
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From: Indianapolis Indiana
Weird clicking noise in the driver's side rear wheel when i go over bumps or take off slow or stop idk what it is, differential is making bad clunking noise when the car shifts (automatic trans)