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

carb vs fuel injection

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Old Jan 2, 2015 | 12:07 AM
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Can you send me a link to all I will need for fuel injection
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Old Jan 2, 2015 | 01:00 AM
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Originally Posted by Benjikittens
Can you send me a link to all I will need for fuel injection
Go to summit racing and enter 550-710
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Old Jan 2, 2015 | 01:07 AM
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Will that include the injectors and fuel rails
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Old Jan 2, 2015 | 01:13 AM
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Originally Posted by Benjikittens
Will that include the injectors and fuel rails
No injectors. Give www.fuelinjectionconnection.com a call and he can sell you some reman injectors. The rest, yes
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Old Jan 2, 2015 | 01:22 AM
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They will also have fuel rails 2
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Old Jan 2, 2015 | 01:24 AM
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I've done both on the same car quite a few times and found the fuel injection the best way to go reliability wise.

On my carb vehicles (the ones that came that way from the factory) they do fine of course but you don't realize how pampered you are with the fuel injection setup till you have tried both on the same vehicle.

I was one of the first (Im sure someone was doing it at the same time somewhere on the planet) that put tune port on a non tune port fbody in the day. Was fun to say the least.
I had an entire donor car side by side with my 85 trans am at the time so that helped a ton. Since the first swap over I switched it back and for probably 5 times or more. The holley, edelbrock, etc carbs I used on it were never as pleasant to drive, crank, etc as the efi was. Also the carbs really dropped in power as they aged. Basically got dirty. I never did figure out how stuff got past the fuel filters to the carbs but it did. Never had a problem with the tpi setup doing that.

Power wise the carb setup made more power hands down. I had a real issue with it reving so fast it thru the belts off I never did convert that car to a serpentine belt and should have. Also it never dawned on me at the time (mannny years ago) that if the carb was throwing the belts it obviously was revving a crap load faster than the tpi was.

But at the end of the day the tpi was just smoother, more reliable and generally fun to drive.
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Old Jan 2, 2015 | 01:48 AM
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Originally Posted by Benjikittens
They will also have fuel rails 2
And fuel pressure regulator
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Old Jan 2, 2015 | 02:46 AM
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If I using it for the track and for occasional weekend driver would the carb be best then for the power the hsr is almost out of my price range
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Old Jan 2, 2015 | 03:12 AM
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Carb is cheap power for drag racing. For autocross or anything with high g turns carbs SUCK. A corvette can easily pull enough lateral g's to overpower the float on a carb with nasty results. Been there done that a bunch. So if your racing has tight turns left and right Id go efi. If its straight line racing Id do a carb.
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Old Jan 2, 2015 | 05:03 PM
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Originally Posted by aklim
Not sure. How do you do it without a dyno to tell what exactly it is doing at what point? Besides, unless you make big changes, why would you be tweaking it again and again?
That's what I figured too but after digging through the DIY prom sections on various forums, it appears otherwise. If you start burning your own proms, you'll definitely burn more than one to get it down just right. That's what I meant by having to do it again and again. If you do it for a living then yeah, you probably only need to rewrite a program once. I know all these guys don't have access to dynos so there's defintiley some on-the-street datalogging.
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Old Jan 2, 2015 | 05:06 PM
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So if I'm just racing on the track and taking a Sunday drive a carb would be the way to go
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Old Jan 2, 2015 | 05:24 PM
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Originally Posted by Benjikittens
So if I'm just racing on the track and taking a Sunday drive a carb would be the way to go
If by track you mean straight line drag racing then yes.
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Old Jan 2, 2015 | 05:25 PM
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Yeah so I should be good with the carb
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Old Jan 2, 2015 | 06:53 PM
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Originally Posted by Benjikittens
So if I'm just racing on the track and taking a Sunday drive a carb would be the way to go
If your weather doesn't change much, sure. If you can drive in different altitude and weather, it gets questionable. My ATV ran like crap at high altitude but great at low. Potentially you can run into the same. That was why I sold it off a year later when fuel injection came out. Starts different in cold weather than hot. I had to warm it up and what not. Jetski is fine since it only runs in summer. Still, hated carb enough to wait till FI was readily available
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Old Jan 2, 2015 | 08:29 PM
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I went the carb route on my 86. For a weekend driver, not a problem. Would not want to drive it in the winter or on long trips. Really don't care about fuel mileage. Carb is pretty happy if you make changes to cam, exhaust ect. The big thing I noticed was it had a lot more rpm than the TPI. Switching back to fuel injection now because I went turbo.

Last edited by drjimmy; Jan 2, 2015 at 08:36 PM.
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Old Jan 2, 2015 | 08:58 PM
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Originally Posted by drjimmy
Carb is pretty happy if you make changes to cam, exhaust ect.

The big thing I noticed was it had a lot more rpm than the TPI. Switching back to fuel injection now because I went turbo.
The reason I suspect is that it is more sloppy which is why it is easier to keep happy. A boss that demands results and discipline in the workplace is going to be harder to work under than one who is willing to accept sloppy work.

IIRC, the TPI system was not built to be a high revving unit. A truck intake unless I am mistaken.
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