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06-20-2016, 10:50 AM #1
LT1 TBI-Just for grins and giggles.
OK, I screwed up when I rebuilt the top end of my 5.7 a year or so ago, and after swapping on the higher compression Vortec heads, I also switched over to Mobil 1 synthetic oil. Ive since been told this is a no no. At least Im doing my part for mosquito abatement..... Anyway, it has caused me to start thinking about what to do with my motor-rebuild it, or replace it. So, I have a 94 LT1 with aluminum heads, that has been sitting at the machine shop for a while waiting for me to give the green light. After a bunch of research, I came up with an idea. Thought I'd run it by you guys to see if I missed anything.
So, my LT1 will be .040 over, and Im going to run the Lunati LT4 hot cam. Specs are 218/228 at .050 with .503 lift with 1.5 rockers. I'll be running 1.6s for .5635 of lift. I was originally going to run a TPI setup, but it would require running a 411 ECM and I have too much money at the moment in an EBL setup that I have the tuning software for already. I got to looking at the dual plane 4V intake from GM performance, and with a carburetor, it pulls 30 ft.lbs. over a stock LT1 setup. As I am already running a 4V manifold with adapter under my TBI, the thought occurred to me that the LT1 dual plane with a TBI could work out real well. Not only does it have the low end grunt of a TPI, but also breathes well into the 5800 RPM range-unlike the TPI. The cam is also good from 18-5800 RPM so that looked like a good fit too. This manifold will also let me run the stock distributor getting rid of the Opti-crap and send the proper signals to my ECM. The 10.5:1 compression with keep the efficiency up too and I should get just as good or better mileage than I do now.
I put the numbers into my desktop dyno-including complete flow numbers for the LT1 heads and 490 CFM for the TBI. At the rear wheels its showing 416 ft.lbs. at 3000 and 337 hp at 4750. If I replace the TBI with a 454 unit, at the rear wheels, I get 426ft,lbs. at 3000 and 346hp at 4750. Looks like the throttle body will naturally limit over rev.
Any thoughts?Last edited by Ccreddell; 06-21-2016 at 10:26 AM.
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06-21-2016, 07:45 AM #2LTX Master
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- Nov 2008
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- Enrique
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- 93 Z28
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I can't read your post written in black font....
93 Z28, 383, PI 3200, Strange 12 bolt, 3.73, Strange coilovers, suspension, and going 24X... for three years or so.
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06-21-2016, 09:22 AM #3
Sorry, that should work better...
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06-22-2016, 04:49 PM #4InActive Member
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- Nov 2013
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- 1997 K1500, SS/SB
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06-22-2016, 05:20 PM #5
That may be true, but there is expertise here too. And, most people know that you can only measure torque, and that horsepower is an equation....
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