cam question on 1982 corvette
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Joined: Nov 2012
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From: greenfield indiana
cam question on 1982 corvette
alright this past winter i tore my engine apart and rebuilt it i of course did some upgrade and should run good but it takes forever to take off till about 3400 rpm for it to actually take off like it should. today i had a buddy check it out for me and he checked the vacuum on it and its making around 12 vacuum which i guess it should be 18? said i need to replace the cam i put in it because its to big. i put a lunati voodoo cam part number 10120702LK i thought that was right but i guess i was suppose to install the lunati voodoo part 10120701LK there is just a little bit of a difference but i did also put 1.6 rocker arms on it which made it worse so my question is should i take my cam out replace it and replace the 1.6 rocker arms or is there away to make what i have already work? does anything need to be done to the computer? also what else was done to the car i put full length headers on it and new edelbrock estreet aluminum heads part number 5089 and also ported the intake and deleted the egr any help would be greatly appreciated
Le Mans Master
Joined: Oct 2006
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From: Gladstone MO
C3 of Year Finalist (appearance mods) 2019
If you can find a company that will custom burn a PROM for your computer it could be made to work. I had one made for a Camaro several years ago. My customer had someone put a cam in that was like yours- low idle vacuum.
Safety Car
Joined: Nov 2005
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From: Arizona - If you don’t know CFI, STOP proliferating the myths around it...
What is the rest of the build, pistons, heads etc... Either cam would work depending, but the 10120701LK would be a better choice, again depending on the rest of the build. Are you running the stock ECM on your 82? 15 would be the absolute lowest you would want to go for vacuum IMO just as a safety issue with power brakes and that would be iffy IMO. 18 or more is good. The killer for a cam change on a stock or somewhat stock CF is the duration @.050, "straying too far from stock" is bad and will cause issues. Your current cam is a bit much, but the other cam that you should have used would have been much better. Also, again IMO, you should go roller cam vs. flat tappet. You will not have to worry about the motor and oil with a roller. Post up the rest of your specs.
Last edited by Buccaneer; May 15, 2017 at 02:55 AM.
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From: greenfield indiana
What is the rest of the build, pistons, heads etc... Either cam would work depending, but the 10120701LK would be a better choice, again depending on the rest of the build. Are you running the stock ECM on your 82? 15 would be the absolute lowest you would want to go for vacuum IMO just as a safety issue with power brakes and that would be iffy IMO. 18 or more is good. The killer for a cam change on a stock or somewhat stock CF is the duration @.050, "straying too far from stock" is bad and will cause issues. Your current cam is a bit much, but the other cam that you should have used would have been much better. Also, again IMO, you should go roller cam vs. flat tappet. You will not have to worry about the motor and oil with a roller. Post up the rest of your specs.
Drifting
Joined: Nov 2016
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From: Pittsburgh PA
you can't change a cam without retuning the computer. since that's not like a modern computer, you need someone to burn you a chip to replace to help the car run better.
I don't know much about the limits of the crossfire computer, but you should find someone knowledgeable about these types of computers and see if you can have a chip burned to match your current cam.
EDIT: your lack of low end power has nothing to due with "need a truck/RV cam" it has to due with the computer still fueling like you have a stock cam, and you fuel requirements have changed.
I don't know much about the limits of the crossfire computer, but you should find someone knowledgeable about these types of computers and see if you can have a chip burned to match your current cam.
EDIT: your lack of low end power has nothing to due with "need a truck/RV cam" it has to due with the computer still fueling like you have a stock cam, and you fuel requirements have changed.
Last edited by Tiger Joe; May 15, 2017 at 07:52 AM.
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Le Mans Master
Joined: Jul 2000
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From: columbia city in
start with 1.5 rockers and see if that helps.I also would check to make sure you don't have a vac leak.
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From: greenfield indiana
I was going to just change them and see if that made the difference but the lift on the cam in it is 219/227 and I guess with the stock computer you can't go over 220 and the other cam is 213/219
Melting Slicks
Joined: Mar 2008
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From: Spring Park MN
You need to get someone who is good with those ECM's to burn a chip based on your build, go to an aftermarket fuel injection system, or go to a carb and intake.
Mike
Le Mans Master
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From: columbia city in
this is the cam I use http://www.compcams.com/Company/CC/c...x?csid=84&sb=0 stock computer.16-17 vacuume.ported intake.
Last edited by terry82; May 15, 2017 at 11:54 AM.
Melting Slicks
Joined: Aug 2003
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From: dayton oh
Bensons - you have ALOT of things going on here with your build. FIRST, the ECU cant handle the cam you picked. SECOND, the E-street heads with 64cc chambers take your DCR above 10.0 which the ECU also cant handle. THIRD - If your Xfire setup isn't in top notch shape, it'll be pressed to feed this combo with the stock fuel pump. FOURTH - your ported intake will still be the choking pt even after you solve 1-3 above, think Renegade intake.
Hope this sends you in the right direction
Fast81
Hope this sends you in the right direction
Fast81
Melting Slicks
Joined: Mar 2008
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From: Spring Park MN
I missed the headers and the ported intake. You are way beyond what the ecm and stock fuel pump can feed, just as Fast81 has stated.
I would really look at going with an aftermarket fuel injection system. You at least are going to have to upgrade your fuel pump and have a chip burned, minimum. You still might have issues.
Mike
I would really look at going with an aftermarket fuel injection system. You at least are going to have to upgrade your fuel pump and have a chip burned, minimum. You still might have issues.
Mike
Last edited by v2racing; May 15, 2017 at 12:48 PM.
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The first number you listed it clearly states in the description Not computer compatible
The second number you listed it clearly states it is a Marine and Towing application.
This is the only Lunati Voodo that is for your computer controlled engine for street usage, 10120700LK
https://www.summitracing.com/parts/l...make/chevrolet
The second number you listed it clearly states it is a Marine and Towing application.
This is the only Lunati Voodo that is for your computer controlled engine for street usage, 10120700LK
https://www.summitracing.com/parts/l...make/chevrolet
Last edited by MelWff; May 15, 2017 at 01:00 PM.
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Joined: Nov 2012
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From: greenfield indiana
Bensons - you have ALOT of things going on here with your build. FIRST, the ECU cant handle the cam you picked. SECOND, the E-street heads with 64cc chambers take your DCR above 10.0 which the ECU also cant handle. THIRD - If your Xfire setup isn't in top notch shape, it'll be pressed to feed this combo with the stock fuel pump. FOURTH - your ported intake will still be the choking pt even after you solve 1-3 above, think Renegade intake.
Hope this sends you in the right direction
Fast81
Hope this sends you in the right direction
Fast81
Thread Starter
Advanced
Joined: Nov 2012
Posts: 52
Likes: 0
From: greenfield indiana
The first number you listed it clearly states in the description Not computer compatible
The second number you listed it clearly states it is a Marine and Towing application.
This is the only Lunati Voodo that is for your computer controlled engine for street usage, 10120700LK
https://www.summitracing.com/parts/l...make/chevrolet
The second number you listed it clearly states it is a Marine and Towing application.
This is the only Lunati Voodo that is for your computer controlled engine for street usage, 10120700LK
https://www.summitracing.com/parts/l...make/chevrolet
Le Mans Master
Joined: Jul 2000
Posts: 6,664
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From: columbia city in
would it be a better idea to get the renegade intake or switch it to another efi I have been told to switch it to a tune port system but didn't know if it would be worth it also I habe no clue how to get this computer upgraded I've heard people upgrade the 82 ECM others put in 84 Corvette ECM in it and put a chip in it or some people get ECM from later TPI cars and make them work for the crossfire I just have no clue on how to do all of that
Drifting
Joined: Jun 2012
Posts: 1,990
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From: Port St. Lucie Fl
dont forget the C4 section here or try
www.thirdgen.org
if you want to learn to tune check out
www.gearhead-efi.com
www.thirdgen.org
if you want to learn to tune check out
www.gearhead-efi.com