Holley Projection Vs Crossfire injection
Thread Starter
Burning Brakes
Joined: Mar 2007
Posts: 901
Likes: 1
From: Jackson Michigan
Holley Projection Vs Crossfire injection
Has anyone tried the Holley projection system on a 84 Vette (auto) with crossfire injection? Would there be any gains? I know that it would require changing of the intake. Would I just be better off getting my throttle bodies reworked with better flowing injectors?
Melting Slicks
Joined: Sep 2006
Posts: 3,194
Likes: 27
From: Monroe Twp, NJ
You might want to check the weiand web site about the Xram for your crossfire. My 84 was modified by the last owner with this set up. Weiand promises 50 plus horsepower (I doubt it) maybe more like 25. The last owner claims a TPI had nothing over his crossfire with this set up. Since I never drove a TPI I could not tell you if that is true or not but the car does pull strong off the line. You may also want to up grade the fuel pump to a 85 if you deside to go with this set up. I think there is a web site called "Crossfire injection vault" which can give you more info should you decide to take the plunge.
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 32
From: The Top of Utah
The X-Ram doesn't do as much for a stock engine as a GOOD porting job on the stock manifold. A 1985 fuel pump will gain you nothing over a good stock pump. Reworking throttle bodies and better flowing injectors won't do anything for you until you get the weak link, intake manifold, working better. The most prevalent problem with the Crossfire for performance IS the manifold. You can do quite a bit with what you have, for little money, but because the Holley set up does include a manifold, it should do a LOT for performance. Of course it won't be a Crossfire any more, if you care.
RACE ON!!!
RACE ON!!!
Team Owner
Joined: Mar 2001
Posts: 30,837
Likes: 289
From: Boston, Dallas, Detroit, SoCal, back to Boston MA
A couple of good pages to read.
http://www.swko.net/~lionsden/crossfire.htm
http://www.technovelocity.com/chevyh...rt_polish.html
http://www.swko.net/~lionsden/crossfire.htm
http://www.technovelocity.com/chevyh...rt_polish.html
Race Director
Joined: Feb 2004
Posts: 12,517
Likes: 19
I cannot comment on the direct comparison the cross fire vs projection. We have installed projection on a few carbed street cars and were very pleased with the outcome. On a well tuned carbed 350 camaro, we saw no et benefits. Both ran the exact same et. We did gain 1 mph in the 1/4 mile, cold starts were improved and gas milage went up 3 mpg.
Long story short, we were pleased with the projection.
Long story short, we were pleased with the projection.
Burning Brakes
Joined: Sep 2006
Posts: 1,202
Likes: 3
From: MD
Ken on the crossfire forum is running a Holley 454TB setup with a 7747 with HAM and EBL. I believe he is very pleased with the results. Try posting on that board under the alternate induction section.
http://crossfire.homeip.net
http://crossfire.homeip.net
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Pro
Joined: Jul 2002
Posts: 703
Likes: 0
From: Milwaukee Wi
I went to the dark side and removed the crossfire in total and run a Holley Projection manifold with a GM 7.4L TBI unit with larger injectors.
Prior to the above conversion i had the Xram and was disappointed with the drivability. I was and am still of the opinion there were fuel distribution problems due to a cold plenum. raw gas found in xram plenum as well as a couple plugs very rich and maybe four plugs correct on color. The design of Xram is very compromised and needs to be. if you reside in a warm climate it may work well. I do not(wisconsin).
Prior to the above conversion i had the Xram and was disappointed with the drivability. I was and am still of the opinion there were fuel distribution problems due to a cold plenum. raw gas found in xram plenum as well as a couple plugs very rich and maybe four plugs correct on color. The design of Xram is very compromised and needs to be. if you reside in a warm climate it may work well. I do not(wisconsin).
Le Mans Master
Joined: Sep 2000
Posts: 6,303
Likes: 714
From: Bartlett IL
Pro
Joined: Apr 2003
Posts: 552
Likes: 11
From: Oz
I ran a ProJection throttle body for a short while.
I didn't really like it, but it was one of the old ones with the crap injectors, and didn't have the progressive linkage that the later ones have.
I also adapted a spare air cleaner to fit so it looked stack, and the cold air ducting was still functional.
It ran fine, but I removed it as I enjoy the challenge of making the Crossfire work instead.
There is nothing to gain from this swap. I would not bother again.
Bored TB's and BBC injectors on an XRam will supply all the air and fuel you can use.
Here are a couple of pics.
I didn't really like it, but it was one of the old ones with the crap injectors, and didn't have the progressive linkage that the later ones have.
I also adapted a spare air cleaner to fit so it looked stack, and the cold air ducting was still functional.
It ran fine, but I removed it as I enjoy the challenge of making the Crossfire work instead.
There is nothing to gain from this swap. I would not bother again.
Bored TB's and BBC injectors on an XRam will supply all the air and fuel you can use.
Here are a couple of pics.
Racer
Joined: Jun 2006
Posts: 461
Likes: 0
From: ilion ny
I ran a ProJection throttle body for a short while.
I didn't really like it, but it was one of the old ones with the crap injectors, and didn't have the progressive linkage that the later ones have.
I also adapted a spare air cleaner to fit so it looked stack, and the cold air ducting was still functional.
It ran fine, but I removed it as I enjoy the challenge of making the Crossfire work instead.
There is nothing to gain from this swap. I would not bother again.
Bored TB's and BBC injectors on an XRam will supply all the air and fuel you can use.
Here are a couple of pics.
I didn't really like it, but it was one of the old ones with the crap injectors, and didn't have the progressive linkage that the later ones have.
I also adapted a spare air cleaner to fit so it looked stack, and the cold air ducting was still functional.
It ran fine, but I removed it as I enjoy the challenge of making the Crossfire work instead.
There is nothing to gain from this swap. I would not bother again.
Bored TB's and BBC injectors on an XRam will supply all the air and fuel you can use.
Here are a couple of pics.
nice work on the air cleaner assembly. do you still have it? i might be willing to take off your hands if ya do and want to part with it.
