Newb: L92 into 68 Vette - fuel inject or carburetor??
10-11-2012, 05:04 PM
#1
Teching In
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Newb: L92 into 68 Vette - fuel inject or carburetor?? First post here: Bought a L92 out of an '09 Escalade a couple months ago and am trying to get it ready to transplant into a '68 Vette. The engine came with the complete truck intake but didn't come with a wiring harness. Got a good deal on a LS3 intake and fuel rail, but no injectors.
My question is this: do I spend the additional money ($1k +/-) to get a modified and flashed harness and ecm and injectors and MAF sensor, or do I sell all the fuel injection stuff and go carbureted? It seems like the computerized/FI route could be easier if I get a plug and play harness, but potentially more expensive than carbureted. The problem is I don't know my *** from a float bowl, or a bowl float, or even a bullfloat, for that matter, so I would probably need some pro help with carb tuning. I live in Colorado, if elevation matters at all.
Opinions? Performance differences between the two?
Thanks for the help.
My question is this: do I spend the additional money ($1k +/-) to get a modified and flashed harness and ecm and injectors and MAF sensor, or do I sell all the fuel injection stuff and go carbureted? It seems like the computerized/FI route could be easier if I get a plug and play harness, but potentially more expensive than carbureted. The problem is I don't know my *** from a float bowl, or a bowl float, or even a bullfloat, for that matter, so I would probably need some pro help with carb tuning. I live in Colorado, if elevation matters at all.
Opinions? Performance differences between the two?
Thanks for the help.
10-11-2012, 05:44 PM
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Launching!
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I vote injected. But it depends on you desired results, budget and skills. You say you can't adjust a carb, I am guessing you will pay someone to do everything either way. The harness and all doesn't have to be that expensive. Paying someone to re-install a small block would probably be cheaper, but for me the drivability of the new technology is worth it. I would research the LS swap before making a decision.
https://ls1tech.com/forums/conversio...s6-intake.html
https://ls1tech.com/forums/conversio...get-build.html
https://ls1tech.com/forums/conversio...s6-intake.html
https://ls1tech.com/forums/conversio...get-build.html
Last edited by 74modified; 10-11-2012 at 05:53 PM.
10-11-2012, 05:59 PM
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I like carbs and there very easy to learn, plus if your like me and don't know computers the carbs the way to go. If its gonna be an everyday driver year around I would go Fi but if it's gonna be aoccasional driver or drag racer I'd go carb for the simplicity of it and raw power potential out of the box.
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10-12-2012, 07:13 AM
#9
Seems like most guys get rid of the VVT anyway, regardless of induction method.
$1K will definitely get you fully carb'd. You won't have to sump your gas tank either. There is a good carb section on this site, lots of good help available. I went carb in large part because I have always wanted to learn how to tune a Holley. It wasn't that hard, sort of therapeutic really. Carb guys seem to be more hands on, while I get the feeling a lot of EFI guys don't like getting their hands dirty. I honestly don't understand why people pay for harness work, and the thought of having a "tuner" for anything less than a pro stock racer sounds gay to me. But if all you want to do is drive then paying to have someone else do the work might be the way.
If you do go carb budget a few bills to buy a wideband O2 sensor. That will allow you to really dial in the carb without a lot of guesswork. You will need a box full of tuning parts too, but the good thing with that is once you have them you're set forever. Carbs will go from engine to engine with little more expense than a few gaskets.
If you want details on all the benefits of carbs vs. EFI then read one of the 100 or so threads on that in the carb section. Carbs aren't for everyone but LS motors sure do take to them well.
$1K will definitely get you fully carb'd. You won't have to sump your gas tank either. There is a good carb section on this site, lots of good help available. I went carb in large part because I have always wanted to learn how to tune a Holley. It wasn't that hard, sort of therapeutic really. Carb guys seem to be more hands on, while I get the feeling a lot of EFI guys don't like getting their hands dirty. I honestly don't understand why people pay for harness work, and the thought of having a "tuner" for anything less than a pro stock racer sounds gay to me. But if all you want to do is drive then paying to have someone else do the work might be the way.
If you do go carb budget a few bills to buy a wideband O2 sensor. That will allow you to really dial in the carb without a lot of guesswork. You will need a box full of tuning parts too, but the good thing with that is once you have them you're set forever. Carbs will go from engine to engine with little more expense than a few gaskets.
If you want details on all the benefits of carbs vs. EFI then read one of the 100 or so threads on that in the carb section. Carbs aren't for everyone but LS motors sure do take to them well.
10-12-2012, 11:44 AM
#10
Just an fyi on fuel systems. The C3 corvette gas tank is tall and narrow. I'm using an external pump with the stock pickup/sender. I've driven it well under 1/4 tank without starvation issues.
Vettworks and Tanks Inc do have intank pump/sumps too if you go that route.
Vettworks and Tanks Inc do have intank pump/sumps too if you go that route.
10-12-2012, 12:00 PM
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Thanks to all for the replies. I'm leaning towards keeping the EFI, there are just so many nuances in going either way, and the VVT only complicates things. I s'pose I need to dig a little further into how the VVT works; I assumed it was only mechanically operated and monitored by the ECM. I didn't realize it was actually electrically controlled by the ECM. Is there some sort of servo involved? I'll try to dig up any threads on it here. Maybe the best route would be a standalone LS3 harness with a new cam and springs, and delete the VVT. I wanted to put a new cam in down the road anyway.
Again, thanks for the info!
Again, thanks for the info!
10-12-2012, 01:04 PM
#14
VVT is having your cake and eating it too, once the fear of the unknown is overcome (and it quickly is) the advantages come clear. Hey, people used to remove HEI's and put in dual-point distributors since they were "better".
If you read thru the threads on keep vs delete VVT you'll find there's more keep than delete votes. Here's one
https://ls1tech.com/forums/generatio...t-not-vvt.html
Disclaimer - mabye I'm biased, I run a LY6 and the car doesn't measure distance in 1/4 mile increments.
If you read thru the threads on keep vs delete VVT you'll find there's more keep than delete votes. Here's one
https://ls1tech.com/forums/generatio...t-not-vvt.html
Disclaimer - mabye I'm biased, I run a LY6 and the car doesn't measure distance in 1/4 mile increments.
10-12-2012, 06:56 PM
#15
Thanks to all for the replies. I'm leaning towards keeping the EFI, there are just so many nuances in going either way, and the VVT only complicates things. I s'pose I need to dig a little further into how the VVT works; I assumed it was only mechanically operated and monitored by the ECM. I didn't realize it was actually electrically controlled by the ECM. Is there some sort of servo involved? I'll try to dig up any threads on it here. Maybe the best route would be a standalone LS3 harness with a new cam and springs, and delete the VVT. I wanted to put a new cam in down the road anyway.
Again, thanks for the info!
Again, thanks for the info!
