C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

replace crossfire with.....?

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Old Sep 28, 2003 | 09:36 PM
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Default replace crossfire with.....?

I wanna replace my 84 crossfire intake. But with what I havent got a clue. Id appreciate any suggestions. And will there be much of a difference? Id assume there would be. Thanks!

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Old Sep 28, 2003 | 09:56 PM
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Default Re: replace crossfire with.....? (Ron84Vette)

If you want a bolt on replacement. http://www.x-ram.com/

If your the 'gearhead' type. Porting with give a nice performance gain.

For Crossfire and other related info. http://www.crossfire.homeip.net:81/

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Old Sep 28, 2003 | 10:09 PM
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Default Re: replace crossfire with.....? (Ron84Vette)

you can also put the LT1 intake on an old school smallblock...
http://www.lt1intake.com
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Old Sep 28, 2003 | 10:11 PM
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Default Re: replace crossfire with.....? (bogus)

what about porting my excisting intake? How much horsepower gain could I expect?
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Old Sep 28, 2003 | 10:41 PM
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Default Re: replace crossfire with.....? (Ron84Vette)

TPI is an easier swap than using an LT1 intake unless you are good at fabing (ie welding grinding ect,,,) the LT1 mabifold has been tried by a few here abd it doesn't seem to be a plug and play system even if you buy the manifold already preped (dist hole, coolant adapters ect...)
If I had to do it all over again instead of the LT1 swap (whole motor not just the intake), I would have built a 383 and went with a mini-ram. I think I could have saved my self a lot of grief.
Depending on what type of numbers you are looking for the X-Ram is an option and you don't have to mess with the ECM, FP, wiring ect...
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Old Sep 29, 2003 | 12:14 PM
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Default Re: replace crossfire with.....? (ejfagala)

TPI is an easier swap than using an LT1 intake unless ...
The swap to a TPI is a big mistake, in MY oppinion. It is a lot of work and expense for a very small gain. If you happen to have a TPI, computer, and wiring harness laying around, then give it a shot. I'm sure you'll be dissappointed. The cheapest and possibly most effective, SIMPLE change, is to port your exisiting manifold. I consistantly beat stock (and near stock) TPI cars at the strip. I have heard mixed reviews on the X-Ram manifold. I'm sure it is a great improvement over the stocker, but I don't see it being THAT much better than my thoroghly ported factory manifold. Remember, this isn't much of an engine to start with. To me, the viable alternatives are the Edlebrock or Holley four barrel TB port injected units. Every other C4, except the '84, is set up for front air intake. The '84 is set up to breathe from the top. Therefore, *I* consider all the "rams" (Super, Mini, Stealth, etc.) used on later C4s to be inappropriate for the '84. Unless of course, you find a way to get air to it. For what it's worth, that's MY two cents. Good luck, and...

RACE ON!!!
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Old Sep 29, 2003 | 01:12 PM
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Default Re: replace crossfire with.....? (CFI-EFI)

talk to Ramanstud he has converted the x-fire to TPI.
Here is the link to his post upon completion. http://forums.corvetteforum.com/zerothread?id=588880

If you are not wanting much over 300 RWHP then you may want to stay with the crossfire and just port it, but I couldn't see taking the time and effort to do major mod's to a crossfire system just so I could run with a basicly stock TPI. It all depends on your aplication. If you want the stock look and are only planing on around 300HP then keep the crossfire but if you are looking for big HP then the TPI is the way to go, and you can always upgrade to a mini-ram if the TPI reaches its limits.


[Modified by ejfagala, 12:13 PM 9/29/2003]
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Old Sep 29, 2003 | 01:50 PM
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Default Re: replace crossfire with.....? (ejfagala)

talk to Ramanstud he has converted the x-fire to TPI.
Here is the link to his post upon completion. http://forums.corvetteforum.com/zerothread?id=588880
[Modified by ejfagala, 12:13 PM 9/29/2003]
:yesnod: I'd be happy to answer any of your questions, so feel free to IM or email me privately. I do plan on putting up a webpage detailing the process as well, and hopefully contribute to a reasonable estimation of the costs and parts involved. But I'm just a little too busy with school to devote any time to it at this point. And I would agree with everyone else on this: If you don't go "modded TPI like I did," versus a stock intake- it really isn't worth the trouble.

Personally I viewed the TPI swap as a challenge, and a cheaper alternative to someone else doing the work. Now I've paved the way for things like a superram, superchargers, etc- with all of the ECM/wiring issues out of the way.

Again, let me know if I can answer any of your questions.

:cheers:
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Old Sep 29, 2003 | 05:40 PM
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Default Re: replace crossfire with.....? (Ramanstud)

And I would agree with everyone else on this: If you don't go "modded TPI like I did," versus a stock intake- it really isn't worth the trouble.

Personally I viewed the TPI swap as a challenge, and a cheaper alternative to someone else doing the work. Now I've paved the way for things like a superram, superchargers, etc- with all of the ECM/wiring issues out of the way.
With all due respect to Ramanstud, a complete injection system, as reccommended in my last post, includes the ECM and the wiring harness. I don't see much point in upgrading to an upgradable sysem, unless the price is really right. If you go with a factory TPI, you end up with an ECM that requires chips to be burned and burned over and over. Especially with the Holley system, you get a programmable Commander 950 ECM. It may not be the ultimate, but I think it would serve much better in the interim, if indeed, further upgrades become desired.

My engine is all stock. It has never had a head off. It has the factory timing chain, even. For probably no more than $1000.00 I have cut better than 2 full seconds off it's 1/4 mile times. Two weeks ago, I took both a 1986 and a 1996 Corvette, in the 1/4, heads up during time trials. I even have a 2000 Z28 with the LS1 (pure stock) under my belt. Even with 159,000 miles on it, it set a new, for me, at my home track, best. Try "playing" with it, it's fun. I just hate to see money wasted. Obviously, this is just one man's oppinion. Ramanstud, my appologies. Good luck, and...

RACE ON!!!
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Old Sep 29, 2003 | 07:42 PM
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Default Re: replace crossfire with.....? (CFI-EFI)

Well to give you the best advice, you need to know how fast are you looking to go? How much money can you spend? How good are with a wrench? If you just want a little more so you aint the slowest vette. I agree you can modify that XFI to go pretty fast. Im glad i didnt butcher up my 84 when i owned her. I modded the stock setup. It ran down most TPI cars. Lots of F-body LT1 cars too and it was easier to sell it when i was done.
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Old Sep 29, 2003 | 09:04 PM
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Default Re: replace crossfire with.....? (blk90rdstr)

Find an Edlebrock SY-1 intake (they are discontinued, but you can find them at swap meets and on ebay) get a custom made top plate to adapt to the cross fire throttle bodies. This eliminates the restriction of the stock cross fire intake.
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Old Sep 29, 2003 | 09:31 PM
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Default Re: replace crossfire with.....? (CFI-EFI)

With all due respect to Ramanstud, a complete injection system, as reccommended in my last post, includes the ECM and the wiring harness. I don't see much point in upgrading to an upgradable sysem, unless the price is really right.....
...Obviously, this is just one man's oppinion. Ramanstud, my appologies. Good luck, and...
RACE ON!!!
No apologies needed! :D I think I made it clear that my project was a personal challenge and something that I did as cheaply as I saw how (I even had to do it in stages to be able to afford it) for the purposes I had in mind, given that I'm still a full-time student. I think I beat the $1500 - $2000 pricetag of whatever those Holley injection setups run, and now I have a story to tell! :lol: But I also did not have the same goals as yourself; thus I don't see why you would need to apologize for going a different route!

I think I mentioned this before in a previous post, but I didn't want to put in a 383ci and slap the `ol crossfire back on it- ported or not. I didn't want to spend months tinkering with the old one to see what worked- I figured for the same money I could "upgrade" to a more proven aftermarket PFI-type setup and be closer to my own goals. I think I put in about $1200 to $1300 into the TPI conversion, including an edelbrock base, SLP runners, new ECM & wiring, as well as all the extemperaneous items like oils, coolants and even a braided fuel line. Not bad for a "temporary" fix!

And besides, it was fun.
:seeya
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Old Sep 30, 2003 | 12:16 PM
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Default Re: replace crossfire with.....? (Ramanstud)

Due to a difference in circumstances and possibly, goals, as I have stated, I would have done it differently. But in the end...Isn't this what it's all about?
And besides, it was fun.
:seeya
*I* am presently trying to see how I can afford to NOT reinstall the Crossfire on a fresh engine it is guarenteed not to be able to feed. I love being the "Crossfire Underdog", but this just ain't gonna work. Good luck, and...

RACE ON!!!
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Old Sep 30, 2003 | 01:13 PM
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Default Re: replace crossfire with.....? (Ron84Vette)

502 Big Block.
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Old Oct 3, 2003 | 12:00 AM
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Default Re: replace crossfire with.....? (Ron84Vette)

You can always try going back to the old style by going with a low rise intake and a good carb. :flag
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Old Oct 3, 2003 | 02:27 AM
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Default Re: replace crossfire with.....? (Rich & Lisa_84)

I'd swap in a Edelbrock Performer Air-Gap, with a Holley 600cfm carb...that mod right there would give you the best bang for your buck :)
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Old Oct 3, 2003 | 10:52 AM
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Default Re: replace crossfire with.....? (bogus)

I started doing that had most of the modifications done but when the intake bolts were on a different angle thats when I decided that this change was turning into a cluster and went with a better idea if you want any of the lt1 parts let me know its complete except for the intake bolt mod
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Old Oct 3, 2003 | 11:07 AM
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Default Re: replace crossfire with.....? (ejfagala)

talk to Ramanstud he has converted the x-fire to TPI.
Here is the link to his post upon completion. http://forums.corvetteforum.com/zerothread?id=588880

If you are not wanting much over 300 RWHP then you may want to stay with the crossfire and just port it, but I couldn't see taking the time and effort to do major mod's to a crossfire system just so I could run with a basicly stock TPI. It all depends on your aplication. If you want the stock look and are only planing on around 300HP then keep the crossfire but if you are looking for big HP then the TPI is the way to go, and you can always upgrade to a mini-ram if the TPI reaches its limits.


[Modified by ejfagala, 12:13 PM 9/29/2003]


Where have you seen a stock TPI motor putting out 300rwhp? :confused:
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