TPI Shootout
10-30-2007, 11:05 PM
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TPI Shootout
So, I had originally planned on a TBI to carb swap, but due to good fortune (or what could be a disaster disguised in good fortune) I have come across a TPI setup. I'm planning on making 350 hp with a 350, which apparently is quite difficult to do with a TPI.
With fully ported L98's; an LT4 cam (218/224), Headers, 3" Y-pipe and 3" Cat-back exhaust, A/C Delete with Stock TPI and 24 lb/hr injectors, others on this site seem to think I'll net around 290 flywheel hp. This seems low, comparibly to a 383 making 410 hp with a stock TPI and larger cam (230-ish intake, slighly larger exhaust). Granted, I cannot run that large of a cam and still keep the car streetable, nor is a 383 equivalent to a 350.
So, therein lay the questions, what do I need to do to make this kind of power with a TPI, how large of a cam can I run before I get vacuum issues, and would it be better (more cost efficient/easier) to just stick with the Carbureted/TBI setup?
I've heard some guys making that kind of power with a TBI....what should I do? HELP!
Thanks for any and all advice, and please don't stone me for being incompetent...lol
With fully ported L98's; an LT4 cam (218/224), Headers, 3" Y-pipe and 3" Cat-back exhaust, A/C Delete with Stock TPI and 24 lb/hr injectors, others on this site seem to think I'll net around 290 flywheel hp. This seems low, comparibly to a 383 making 410 hp with a stock TPI and larger cam (230-ish intake, slighly larger exhaust). Granted, I cannot run that large of a cam and still keep the car streetable, nor is a 383 equivalent to a 350.
So, therein lay the questions, what do I need to do to make this kind of power with a TPI, how large of a cam can I run before I get vacuum issues, and would it be better (more cost efficient/easier) to just stick with the Carbureted/TBI setup?
I've heard some guys making that kind of power with a TBI....what should I do? HELP!
Thanks for any and all advice, and please don't stone me for being incompetent...lol
10-30-2007, 11:14 PM
#2
Re: TPI Shootout
MadMax made around 330rwhp with his TPI setup. At the motor that would translate to well above 400hp. He has an A4. I know he is running the stock intake runners, not sure about the rest of the intake. He also has AFR 190 heads and the XFI280 cam. Maybe he will see this post and chime in.
10-31-2007, 12:41 AM
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Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: TPI Shootout
So, I had originally planned on a TBI to carb swap, but due to good fortune (or what could be a disaster disguised in good fortune) I have come across a TPI setup. I'm planning on making 350 hp with a 350, which apparently is quite difficult to do with a TPI.
With fully ported L98's; an LT4 cam (218/224), Headers, 3" Y-pipe and 3" Cat-back exhaust, A/C Delete with Stock TPI and 24 lb/hr injectors, others on this site seem to think I'll net around 290 flywheel hp. This seems low, comparibly to a 383 making 410 hp with a stock TPI and larger cam (230-ish intake, slighly larger exhaust). Granted, I cannot run that large of a cam and still keep the car streetable, nor is a 383 equivalent to a 350.
So, therein lay the questions, what do I need to do to make this kind of power with a TPI, how large of a cam can I run before I get vacuum issues, and would it be better (more cost efficient/easier) to just stick with the Carbureted/TBI setup?
I've heard some guys making that kind of power with a TBI....what should I do? HELP!
Thanks for any and all advice, and please don't stone me for being incompetent...lol
With fully ported L98's; an LT4 cam (218/224), Headers, 3" Y-pipe and 3" Cat-back exhaust, A/C Delete with Stock TPI and 24 lb/hr injectors, others on this site seem to think I'll net around 290 flywheel hp. This seems low, comparibly to a 383 making 410 hp with a stock TPI and larger cam (230-ish intake, slighly larger exhaust). Granted, I cannot run that large of a cam and still keep the car streetable, nor is a 383 equivalent to a 350.
So, therein lay the questions, what do I need to do to make this kind of power with a TPI, how large of a cam can I run before I get vacuum issues, and would it be better (more cost efficient/easier) to just stick with the Carbureted/TBI setup?
I've heard some guys making that kind of power with a TBI....what should I do? HELP!
Thanks for any and all advice, and please don't stone me for being incompetent...lol
This is what I made with a 305 TPI. Rear Wheel numbers on a Mustang Dyno. Drivetrain is a 700r4, 2 piece driveline with carrier bearing, and a 9.5" ring gear 14 bolt corporate GM rear end (HUGE power loss, but tough as nails)
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