Is my CF typical?
Thread Starter
Racer
Joined: Mar 2010
Posts: 399
Likes: 0
Is my CF typical?
I keep hearing how the 84's are slow, etc, etc. Mine easily smokes the tires and chirps them shifting into 2nd - is this typical or do you suppose the PO did some work to the engine? It still has original intake manifold. I may take it to a local dyno shop just to see what kind of HP it's putting out.
Race Director
Joined: Dec 2000
Posts: 17,551
Likes: 26
From: El Paso Texas
The Crossfire has long runners, which aid in building low end torque. The torque is why you feel strong acceleration off the line. When the trans shifts, the engine falls right back into the middle of the torque curve, hence the chirp. My old 150K Crossfire would do the same....but when I put new tires on it, both went away and the car just pulled. How old are your tires....any chance they're getting a bit hard?
At any rate, the CF ran respectfully for it's day, and still ain't bad today....it just runs out of breath at anything above 4000 rpm. Around town, it feels like any other C4 (ZR-1 notwithstanding).
At any rate, the CF ran respectfully for it's day, and still ain't bad today....it just runs out of breath at anything above 4000 rpm. Around town, it feels like any other C4 (ZR-1 notwithstanding).
Instructor
Joined: Dec 2010
Posts: 138
Likes: 1
I think I have had my 87 above 4000 rpm only a few times. I have no reason to race much in my car. I bought it because it is fun to drive on a warm sunny day . 
Mostly with my 3.07 rearend, my engine just never revs up around town. I have an Automatic and my car just purrs along doing 70 around 2300 or so .
My car is just a fun sporty car to drive. What it was intended to be. Not a muscle car or super fast car. The right mixture of handling and power.
Mostly with my 3.07 rearend, my engine just never revs up around town. I have an Automatic and my car just purrs along doing 70 around 2300 or so .
My car is just a fun sporty car to drive. What it was intended to be. Not a muscle car or super fast car. The right mixture of handling and power.
Racer
Joined: Jul 2010
Posts: 261
Likes: 0
From: Spokane WA
Sounds like your crossfire us setup well and in good working order. Check your tire size I have a set of tires on stock rims that are 245's and they spin easier and chirp and all the rest. But when iput on wider tires it spun less. Stock your tires should be 255's.
You could have a crossfire with a ported intake manifold and larger tbs and injectors maybe a higher stall converter, shift kit. It would be pretty tuff to tell these mods are on the car. Do you know the previous owner or did you buy it from a dealer.
Stock crossfires run about 15.1 in the 1/4. TPI cars are only half a second quicker. If you find out anything about your car or get it dunked let us know.
You could buy yourself a g-tech and see if your corvette is in the ball park of a stock crossfire.
You could have a crossfire with a ported intake manifold and larger tbs and injectors maybe a higher stall converter, shift kit. It would be pretty tuff to tell these mods are on the car. Do you know the previous owner or did you buy it from a dealer.
Stock crossfires run about 15.1 in the 1/4. TPI cars are only half a second quicker. If you find out anything about your car or get it dunked let us know.
You could buy yourself a g-tech and see if your corvette is in the ball park of a stock crossfire.
Last edited by 84cfi; Aug 29, 2011 at 10:59 AM.
Pro
Joined: Mar 2000
Posts: 658
Likes: 7
From: Perth Amboy New Jersey
I keep hearing how the 84's are slow, etc, etc. Mine easily smokes the tires and chirps them shifting into 2nd - is this typical or do you suppose the PO did some work to the engine? It still has original intake manifold. I may take it to a local dyno shop just to see what kind of HP it's putting out.
If you are happy with your current setup, then it FAST as you need it to be.
Last edited by yedister; Aug 29, 2011 at 11:12 AM.
Thread Starter
Racer
Joined: Mar 2010
Posts: 399
Likes: 0
Yep, I'm happy with my car - it's a Z61, has newer 855 tires and everything seems stock. I'm not racing or abusing it, generally cruising it around and enjoying the experience. I know it's not like a newer vette, but asked just because some of the posts here imply that the CFs are *so* slow and a pain in the neck to maintain, which is the exact opposite of my experience.
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Instructor
Joined: Dec 2009
Posts: 124
Likes: 0
From: glens falls ny
i run an 84 crossfire down the strip sometimes the only mods i have now are true duel exhaust no cat flowmaster muffs and the k&n filter in the stock box we get down at 14.8 and my reaction time could be better! I rev it to about 5200 and she still seems pretty getty up there not the fastest but i said it was stock! maybe with these simple mods like porting the intake could take us into low 14s!!
Pro
Joined: Mar 2000
Posts: 658
Likes: 7
From: Perth Amboy New Jersey
Yep, I'm happy with my car - it's a Z61, has newer 855 tires and everything seems stock. I'm not racing or abusing it, generally cruising it around and enjoying the experience. I know it's not like a newer vette, but asked just because some of the posts here imply that the CFs are *so* slow and a pain in the neck to maintain, which is the exact opposite of my experience.
Racer
Joined: Jul 2010
Posts: 261
Likes: 0
From: Spokane WA
i run an 84 crossfire down the strip sometimes the only mods i have now are true duel exhaust no cat flowmaster muffs and the k&n filter in the stock box we get down at 14.8 and my reaction time could be better! I rev it to about 5200 and she still seems pretty getty up there not the fastest but i said it was stock! maybe with these simple mods like porting the intake could take us into low 14s!!
My crossfire with: renegade intake, 2 inch TB's, random cat, walker rear y-pipe no mufflers, k&n, ads chip & 180 stat, underdrive pulleys, shift kit, fuel pressure adjusted to 15 psi and timing advanced to 12 gave me a best of 13.98 in the 1/4 mile.
Le Mans Master
Joined: Jan 2008
Posts: 7,030
Likes: 10
From: Edmonton, Alberta
Drifting
Joined: Jan 2008
Posts: 1,752
Likes: 62
From: New Madison Ohio
I keep hearing how the 84's are slow, etc, etc. Mine easily smokes the tires and chirps them shifting into 2nd - is this typical or do you suppose the PO did some work to the engine? It still has original intake manifold. I may take it to a local dyno shop just to see what kind of HP it's putting out.
..each and every mile I put on it. This is just my opinion.
Melting Slicks
Joined: May 2009
Posts: 2,781
Likes: 184
From: Decatur IL
2025 C4 of the Year Finalist - Unmodified
2022 C4 of the Year Finalist - Unmodified
The Crossfire has long runners, which aid in building low end torque. The torque is why you feel strong acceleration off the line. When the trans shifts, the engine falls right back into the middle of the torque curve, hence the chirp. My old 150K Crossfire would do the same....but when I put new tires on it, both went away and the car just pulled. How old are your tires....any chance they're getting a bit hard?
At any rate, the CF ran respectfully for it's day, and still ain't bad today....it just runs out of breath at anything above 4000 rpm. Around town, it feels like any other C4 (ZR-1 notwithstanding).
At any rate, the CF ran respectfully for it's day, and still ain't bad today....it just runs out of breath at anything above 4000 rpm. Around town, it feels like any other C4 (ZR-1 notwithstanding).
