My TPI build. Pics
02-09-2009, 03:16 PM
#53
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Re: My TPI build. Pics
The only reason I went with a 52mm is because I just wanted a new TB and I've always wanted a BBk piece. To be honest, you will never need a 58mm TB unless you are making HUGE power. The point has been made several times that GM's Ramjet 502 motor makes 500+ hp and it still uses a 48mm TB. I think 52mm is ok, I probably would have been better off with a 48 in the long run, but 58mm is just too big for most people making less than 500hp, and even then.
02-09-2009, 03:30 PM
#54
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Car: 91Z28
Engine: 5.7 ls1
Transmission: 4l60e
Axle/Gears: 3.42
Re: My TPI build. Pics
What can you do do get more miealege in this car other than not step on it all the way
02-09-2009, 03:38 PM
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Re: My TPI build. Pics
Tuning can make or break passing smog(tailpipe) tests, but to say "all" is a stretch. I don't see the 280 and 292XFI cams passing, but you CA guys are always pushing the limits of emmissions, that's for sure! 
04-06-2009, 11:26 PM
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Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: My TPI build. Pics
Nah! This has been disproved years ago. Going larger increases the responsiveness and usually bumps the hp across the rpm. I went from a 52 to a 58 on my current 355 and absolutely loved the difference. It was worth just a couple more ponies and the responsiveness is just amazing. 58's are now commonly used period. I used to advocate the larger TB's are not necessary, until I seen many tests and eventually tried it myself. When your starting from a 48 and your ready to buy, get the 58. It'll pay off in the long run. Your engine looks like it will be a torque monster! Keep us up to date!
My current TPI engine has the stock TB on it, with nothing more than a flow straightener. It works GREAT for my use. I am only pulling 4 KPA restriction through the entire intake tract. Its over 300 hp at the wheels.
Last edited by Fast355; 04-06-2009 at 11:32 PM.
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