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#41 ·
Just use a tune for a std trans.

Slowpoke70 said:
Hmm, using a TH350 makes it sound more attractive, but what kind of hoops will I need to jump through to get the computer the signals it needs that it usually gets from the 4L60E?
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Discussion starter · #42 ·
Slowpoke70 said:
Hmm, using a TH350 makes it sound more attractive, but what kind of hoops will I need to jump through to get the computer the signals it needs that it usually gets from the 4L60E?
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As gearhaed said, the ECU can be programmed with a tune from a manual transmission car. The only input that the ECU will need from the trans is a squarewave signal from a VSS (vehicle speed sensor). Both Autometer and VDO make VSS sensors that can send the appropriate signal as well as continue to allow a cable driven speedo.

http://www.autometer.com/cat_accessories.aspx?sid=46

The speedo sender in the middle will do the trick and your speedo cable will continue to operate as it did before.

Andrew
 
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Discussion starter · #43 ·
Scotch said:
Stepping into a Roots-style supercharger will have appeal, but I'm confident owners will want to keep their existing fuel/ign systems intact, since they're quite good.

Scotch~!
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The 250-256 style supercharger will work very well with a Gen III engine. The ignition can be controlled with the new MSD 6010 controller. It will fire the stock coils and it will also take a MAP (manifold air pressure) input. By programming the ignition curves, you can have it pull timing as you build boost for safety.

EFI is really not mandatory with a supercharger. Any deficiencies that a carburetor has are greatly deminished if not totally eliminated by the supercharger. By having the air and fuel enter through the top of the supercharger, the incoming charge is cooled and it helps to better seal the rotors of the supercharger.

Check out the power curve of a 142 supercharger on a plain jane SBC with Vortec heads:

http://www.holley.com/data/Products/Media/6542-1_Power_Curve.pdf

Check out the AFR graph at the bottom. Most EFI tuner would die for an AFR curve like that. That was with a Holley supercharger carb that was calibrated for a 350 and a 142 supercharger. Looks like the tune up is dead nuts on the money.

So is EFI nice? You bet! But with a properly tuned carb(s) on a roots blower you can have very similar results.

Andrew
 
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#44 ·
So I guess an easy way to do this would be to aquire an engine, or maybe an engine and trans, sell the trans, get a TH350/400/700r4 and use that autometer gizmo and have the computer programmed for a stick shift and there you go.....

Sounds so cool.
 
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#45 ·
If you are going to run an Ls engine thats pretty much stock or slightly modified run the trans that comes with the engine. dont put a 700r4 behind it because you arent gaining anything but a speedo drive. they make adapters that turn a vehicle speed sensor signal into a manual cable drive for your speedo. it has a small motor that turns it. the electronic trans that comes with the engine will work awesome once the computer is reprogrammed.you can bump up line pressure and set your own shift points.Also set the rev limiter where you want.If you are going to keep the fuel injection which is what I would do then the turbo 350 will just ruin mileage and performance.then agaian a 6 speed would be awesome and run a procharger, this would be the way I would want it. An LS1 and trans combo usually starts around 2500 and on up used. I love big blocks as I have alot of them but I also like the ls1 in the muscle cars.You would have to notch the frame to run the a/c in the factory position thats what we did on the 81 camaro. The fuel system wont cost anymore than a high perfomance pump and regulator for a street strip big block, actually its about the same. The biggest expence is the wire loom and pcm reprogram,its around 1k for both ready to go.We used stock oil pan and exhaust manifolds from the 98 camaro.
 
#48 ·
Prices aren't that bad now you can get a complete forged bottom 408" for $8g and a donor motor for $1g with computer and harness. You'd have to added headers and a FAST intake/TB for best #s. The setup should give ~525rwhp with a manual and 12 bolt.

My mild 346 Ls1 in a C5 turned 436 rwhp and 415 rwtq with a set of $1,600 ported 5.3 truck heads, and a 228/230 112+4 cam lift was 575/595 on a LS6 intake and polished up factory TB through a 6 speed. The motor never had a problem.

You could most likely build a big block cheaper especially with a carb and building it yourself. However it is not a bad deal if you're interest in weight and handling like Andrew. You could always build it yourself and the motor would take a healthy nitrous shot if you want. Don't count out the LS motors they're proving as tough as the old motors.

Painless and Speartech are both modifying harnesses and some have said the B-body tank can swap in so you would be setup for a fuel injected fuel system. I've been very tempted to try the swap in my Chevelle.

http://www.ls1tech.com/forums/ has an informative conversion section.
 
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