just kidding-don't unload on me.
crossfire to TPI ?
Thread Starter
Drifting
Joined: Jan 2003
Posts: 1,894
Likes: 3
From: Reading PA.
Wow! lot's of opinions here good and bad about the swap idea. I wanted to make the car into a bracket car and i'm more familiar with the Tuned Port. I allready have a 383 with a Mini Ram so I wouldn't really need much except the wiring harness and the ECM I guess. The Mini Ram sits very low so I don't think I would have much problem with the clearance issue under the hood. The reason I brought this swap up is because I probabally don't know what to do to make the Crossfire work well under drag race conditions and have heard that Crossfire's have their issues. THANKS GUYS FOR ALL THE REPLY'S Pipe
Burning Brakes
Joined: Oct 2004
Posts: 1,019
Likes: 1
From: Weymouth Dorset
Been there done it, and yes it was well worth it I did use a 1990 SD setup that I had left over from my 90 just bought a harness from jim at http://www.jimsperformance.com/carty3.html and a new ecm ( 91 F body ) and jim burnt me a prom vats disabled, the only thing is that your cons / ave fuel wont read but that is no big loss.
If you get stuck on the wiring give us a yell cos I have it writen down somewhere , the only pain in the whole conversion was doing the work under the dashboard for the wiring and finding space for the ECM, the rest was easy.
End result .... the car is much more responsive and better on fuel, and yes I would do it again tomorrow it was well worth it
.
If you get stuck on the wiring give us a yell cos I have it writen down somewhere , the only pain in the whole conversion was doing the work under the dashboard for the wiring and finding space for the ECM, the rest was easy.
End result .... the car is much more responsive and better on fuel, and yes I would do it again tomorrow it was well worth it
.
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by rick lambert
Isn't cross fire like an old carb setup CFI-EFI just kidding-don't unload on me.
Originally Posted by adi4
End result .... the car is much more responsive and better on fuel, and yes I would do it again tomorrow it was well worth it
RACE ON!!!
5th Gear
Joined: Mar 2006
Posts: 5
Likes: 0
Go faster info for a CFI
Hi all from the U.K.
I own an '84 CFI which I must first say runs really well and is in excellent condition in all areas.Really interesting reading these threads about CFI /TPI conversion.I agree with the fact that for the effort and money, gains are minimal.Especially here in the U.K where parts and labour costs would be much higher than in the States.
The mechanic that services my car drives loads of different Vettes in his work and says my car runs really strong,better than some later TPI's,.which is good to know!
However,you guys must know more about getting better performance from a CFI than any one here in the U.K. Any suggestions on stuff that can be done that's not too expensive?!
One problem that showed up on my car recently. It was being filmed for a TV program on restoring older C4's, and was given a good thrashing around an airfield.Mostly sideways,drifting it around bends etc. Not the way it's normaly driven on public roads.
The problem was engine cutting out when the car was really sideways,and when this happened the tires would grip,flicking the car back into a straight line,and then the engine would be on full power again. I think this is the fuel pump.Maybe on very hard cornering the fuel is pushed to the side of the fuel tank away from the pump.Would this be the pump being worn (it's probably original ) or for this sort of driving, do I need an uprated pump?
Any help on all this would be appreciated.
I own an '84 CFI which I must first say runs really well and is in excellent condition in all areas.Really interesting reading these threads about CFI /TPI conversion.I agree with the fact that for the effort and money, gains are minimal.Especially here in the U.K where parts and labour costs would be much higher than in the States.
The mechanic that services my car drives loads of different Vettes in his work and says my car runs really strong,better than some later TPI's,.which is good to know!
However,you guys must know more about getting better performance from a CFI than any one here in the U.K. Any suggestions on stuff that can be done that's not too expensive?!
One problem that showed up on my car recently. It was being filmed for a TV program on restoring older C4's, and was given a good thrashing around an airfield.Mostly sideways,drifting it around bends etc. Not the way it's normaly driven on public roads.
The problem was engine cutting out when the car was really sideways,and when this happened the tires would grip,flicking the car back into a straight line,and then the engine would be on full power again. I think this is the fuel pump.Maybe on very hard cornering the fuel is pushed to the side of the fuel tank away from the pump.Would this be the pump being worn (it's probably original ) or for this sort of driving, do I need an uprated pump?
Any help on all this would be appreciated.
Burning Brakes
Joined: Oct 2004
Posts: 1,019
Likes: 1
From: Weymouth Dorset
Originally Posted by CFI-EFI
It looks a little like dual quads on a cross ram. It must be the same thing.
That Crossfire must have been severely neglected and in need of some serious maintenance. I had intended to comment further, but adi4's signature makes all my points so much better than I ever could.
RACE ON!!!
That Crossfire must have been severely neglected and in need of some serious maintenance. I had intended to comment further, but adi4's signature makes all my points so much better than I ever could.
RACE ON!!!
.
Intermediate
Joined: Nov 2005
Posts: 44
Likes: 0
From: Rockford IL
C4 CFI to L98 (TPI)
I think its a good idea. I've got an 84 (CFI/auto) as well, cheapest of the C4... so i figured its best place to start for any sort of project or build.Frankly... even mint early c4's and even the earliest (CFI) dont seem to be woth that much. I've gone with a LT1 set up out of a wrecked 95' LT1 car. Still going to run the 700R4 till all running bugs have been ironed out. Then I'm going to swap out the 700R4 for a ZF-6speed. With the stock motor LT1, exhaust and msd... It will be a completely diffrent car than before. All I'm looking for is cheap fun.My 2
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Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by adi4
The crossfire was running fine with no codes,
RACE ON!!!
Melting Slicks
Joined: Oct 2002
Posts: 3,193
Likes: 1
From: Cincinnati Oh
For the Crossfire guys...
Had I to do it over again, I think I'd consider going 383ci with an Xram plenum, overbored TBs, heads/cam... that would be pretty potent I think. The hard part would be tuning on a slower ECM.
The crossfires DO have a ton of potential, but... like carbs... are not for everyone. Different strokes for different folks.
Had I to do it over again, I think I'd consider going 383ci with an Xram plenum, overbored TBs, heads/cam... that would be pretty potent I think. The hard part would be tuning on a slower ECM.
The crossfires DO have a ton of potential, but... like carbs... are not for everyone. Different strokes for different folks.
Safety Car
Joined: Feb 2000
Posts: 3,771
Likes: 0
From: MANDEVILLE, LA La
Originally Posted by qws
Its not worth changing the CFI to TPI, the only gain is about 25hp at best. I've looked into prior to making mods on my car and the cost to do it with a used TPI will run about $900 or so and for what? A lousy 25hp, don't think so. It will be a lousy investment for you.
There is nothing wrong with a CFI if its tuned correctly and its pretty simple to work on as well. If you want to make mods then spend your money more wisely such as
1) port your intake- $0 and your labor
2)headers- cheap set $140.00, better set set $500
3) at least if you go with the x-ram and some rr's that gonna cost $600, and that investment is at least wiser than the TPI.
I installed rr's,headers,x-ram and I'm lovin the car.
And stay away from a carb I think and I don't have "facts" just opinion, I feet the TB's from the CFI are better and more reliable.
There is nothing wrong with a CFI if its tuned correctly and its pretty simple to work on as well. If you want to make mods then spend your money more wisely such as
1) port your intake- $0 and your labor
2)headers- cheap set $140.00, better set set $500
3) at least if you go with the x-ram and some rr's that gonna cost $600, and that investment is at least wiser than the TPI.
I installed rr's,headers,x-ram and I'm lovin the car.
And stay away from a carb I think and I don't have "facts" just opinion, I feet the TB's from the CFI are better and more reliable.
Racer
Joined: Oct 2005
Posts: 405
Likes: 0
From: 1984 crossfire, Alhaurin de la Torre Malaga, Spain
Originally Posted by telboy
Hi all from the U.K.
I own an '84 CFI which I must first say runs really well and is in excellent condition in all areas.Really interesting reading these threads about CFI /TPI conversion.I agree with the fact that for the effort and money, gains are minimal.Especially here in the U.K where parts and labour costs would be much higher than in the States.
The mechanic that services my car drives loads of different Vettes in his work and says my car runs really strong,better than some later TPI's,.which is good to know!
However,you guys must know more about getting better performance from a CFI than any one here in the U.K. Any suggestions on stuff that can be done that's not too expensive?!
One problem that showed up on my car recently. It was being filmed for a TV program on restoring older C4's, and was given a good thrashing around an airfield.Mostly sideways,drifting it around bends etc. Not the way it's normaly driven on public roads.
The problem was engine cutting out when the car was really sideways,and when this happened the tires would grip,flicking the car back into a straight line,and then the engine would be on full power again. I think this is the fuel pump.Maybe on very hard cornering the fuel is pushed to the side of the fuel tank away from the pump.Would this be the pump being worn (it's probably original ) or for this sort of driving, do I need an uprated pump?
Any help on all this would be appreciated.
I own an '84 CFI which I must first say runs really well and is in excellent condition in all areas.Really interesting reading these threads about CFI /TPI conversion.I agree with the fact that for the effort and money, gains are minimal.Especially here in the U.K where parts and labour costs would be much higher than in the States.
The mechanic that services my car drives loads of different Vettes in his work and says my car runs really strong,better than some later TPI's,.which is good to know!
However,you guys must know more about getting better performance from a CFI than any one here in the U.K. Any suggestions on stuff that can be done that's not too expensive?!
One problem that showed up on my car recently. It was being filmed for a TV program on restoring older C4's, and was given a good thrashing around an airfield.Mostly sideways,drifting it around bends etc. Not the way it's normaly driven on public roads.
The problem was engine cutting out when the car was really sideways,and when this happened the tires would grip,flicking the car back into a straight line,and then the engine would be on full power again. I think this is the fuel pump.Maybe on very hard cornering the fuel is pushed to the side of the fuel tank away from the pump.Would this be the pump being worn (it's probably original ) or for this sort of driving, do I need an uprated pump?
Any help on all this would be appreciated.
I do NOT argue that the TPI should run fine and has the potential to be upgraded, but..
I agree with the opinion that the money and effort to put into a TPI conversion is not worth it compared to a good running CFI with removed restrictions. Also the gas milage of the CFI is GOOD. I run 9 liters at a 100 kM with a speed of 140 kM/Hr. I consider that very good for an engine of this size. I have the opinion that the money spent at a TPI conversion can be spent better.
Safety Car
Joined: May 2006
Posts: 4,290
Likes: 140
From: Salem NH
A used TPI setup can be had for 200-300, and you don't need a harness. Some donor connectors, and injector plugs, and about 45 minutes to repin it. Spend 15 minutes at the junkyard gathering electrical parts you need (about $5-10),
I'm not sure about hood clearance on Crossfire vettes, i'm not a vette expert, but I'd think a miniram would fit being so low profile.
I'm finding the majority of vette owners are afraid of things that are not plug and play. Or maybe I'm just reading the wrong posts.
-- Joe
I'm not sure about hood clearance on Crossfire vettes, i'm not a vette expert, but I'd think a miniram would fit being so low profile.
I'm finding the majority of vette owners are afraid of things that are not plug and play. Or maybe I'm just reading the wrong posts.
-- Joe
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
Originally Posted by Ramanstud
For the Crossfire guys...
Had I to do it over again, I think I'd consider going 383ci with an Xram plenum, overbored TBs, heads/cam... that would be pretty potent I think. The hard part would be tuning on a slower ECM.
The crossfires DO have a ton of potential, but... like carbs... are not for everyone. Different strokes for different folks.
Had I to do it over again, I think I'd consider going 383ci with an Xram plenum, overbored TBs, heads/cam... that would be pretty potent I think. The hard part would be tuning on a slower ECM.
The crossfires DO have a ton of potential, but... like carbs... are not for everyone. Different strokes for different folks.
Safety Car
Joined: Feb 2000
Posts: 3,771
Likes: 0
From: MANDEVILLE, LA La
Originally Posted by 84vette967
How much are you looking to get for it?
How's $250.00 Shipped sound.?
BTW..This does not include the $100.00 cost of the 8746 itself..
My total investment is $400.00
see www.speedtronics.net
Bill Hitchcock
Last edited by CAJUN C4; May 23, 2006 at 10:17 AM.
Drifting
Joined: Jan 2001
Posts: 1,408
Likes: 13
From: Dayton, Ohio
Pro
Joined: Nov 2002
Posts: 737
Likes: 11
From: Charlotte MI
Originally Posted by steve1ph2
valid points. 1. there are ways to get around that depending on your resources. 2. buy a honda. 3. seems most people drive their vettes on sundays to the drive inn and back no really big elevation swing. 4. longevity? a person looking to modifi a sbc isnt worried about an extra 3k miles. 5. crisp throttle response? same with carb......at least mine. i done the holy " super ram " setup befor i upgraded to the carb same or better performance with out all the hassle. this is the good thing about this or any other forum you get the pro`s and con`s.