Hey guys, kinda new at TPI. I have an 87 TA w 305 TPI. I have an 89 359 TPI engine I plan on going to 383 with. I wold like to get at least 400hp NA, ???? with an ATI Procharger. Just wanting to know what others have done, intakes,heads,cams,runners,comp ratios,etc. I have seen several "kits" on e-bay, any worth the money??? Should I go internal or externaly balanced??
Any help would be greatly appreciated.
Guido, I know you are the man at TC from reading the boards, I don't need that much HP, what are your thoughts? THANKS

 

your 350 tpi will make 400 RWHP with a 9 # P1SC properly tuned with little more than good 1.6 rockers, headers, and cat back

 

this 91 made this (see below) then we put new valve springs (.550 lift Z28's because the stock ones were shot) 1.6 self centering rockers, 1 3/4" slp headers, "special" high flow cats, fixed the belt slip and added a goodyear gatorback belt (better pulley traction) it made about 2# more just driving it but we never got to dyno it again. but as you can see a little common sense says it might have added the 29 hp that could have put it over 400 rwhp and 500 FT #

 

Read your graph better. Max data was from that spurious data spike at the 3900 RPMs.

In the continuous area of the graph

I read max power (light blue) as 330 HP @ 4550 RPMs

I read max torque (dark blue) as 400 fl-lbs @ 4000 RPMs.

 

yes you are very correct, I wasnt trying to pull a fast one. I know my peers are too smart for that. I admit my wrong doing, and am ready to face my lashes, it may be I have dynoed too many cars. I think I remembered this car improperly. I drew the wrong dyno run from the dyno computer and never bothered to even look at which one it was or look at the graph. shame on me I'll try to get a good one out if there is one. sorry about that. besides we have mustangs here with nothing but a 302, exhaust, and an s-trim doing it so why not on the z28 I think was my first mistake in my skewed memory.

 

We all make mistakes, it is only human, but the next time......LOL

 

i thought i was wrong once, but i was mistaken. b4ctommy-you say thumbs up to them gatorback belts? im asking because i get them supplied to me at some really low prices thru a warehouse i deal with. i intentionally steered clear of it because the original procharger belt is gates style-continuous ribs versus the "slashes" every inch or so on the goodyear. so i am running an ac delco(reboxed gates) that is getting to the end of its career and am thinking of replacing it soon. hows the durability with the gatorback? o.k.? the gator is only about 21.00 bux or so versus 32.00 for the general(a c delco) thanks for any assist.

 

Taking nothing away from your engine's dyno run and no flame intended.............

How the he11 does the torque curve not cross the HP curve at 5250??? By DEFINITION they MUST be the same at 5250 RPMs.

HP = (Torque x RPM) / 5250

This is why I HATE dyno numbers. The torque curve I can believe, but the way they calculate HP is beyond my comprehension.

 

5252 rpm if we are splitting hairs

 

Hey guys, not to bust chops, but no one has really helped much. I am looking for 383 setups that work with a supercharger for a daily driver. Have some $$ to spend(wife said it was ok), I have a 350 from an 89 iroc, putting it in an 87 TA. Big plans for the car, complete new interior,engine,trans,hood,spoiler. Must start with engine and trans. I also got a 700R4 with the engine. What shift kits are some of you using? torque converters? Need some help here guys, don't let me down. Thanks

 

Dude, look at the scales on the graph... At 5.2K RPM, torque is about 300. At 5.2K RPM, horsepower is oh, about, 300! Two curves, two different scales my man.... As for 87TPITA's original question, I have heard TPI can work on a bigger engine, but you need to port and modify the crap out of it. Other than that, I don't know. Good luck though, sounds like you are gonna become good friends with the Tire Rack

 

Do a search on Power Adder about 383 build-ups and supercharging. There are a lot of post about this. And lots of options.

I'm doing a 385 (4.04" bore, 3.75 in stroke) in a boat with an aftermarket forged crank, TPI intake (also aftermarket) and about 8.6:1 compression. I'm using home ported 993 heads that have a valve job. 993 heads have 76 cc combustion chambers.

I chose a Crower blower cam that was rated for upto 8-10 psi boost.


Getting 400hp on a factory TPI is not going to be easy without a power adder.

If you go with a factory 400 crank, it will be extenally balanced. The aftermarket 3.75 forged crank is internally balanced.

BTW, the 5252 is more like 5252.1131. With 550 ft*lbs/sec in a HP, 60 seconds in a minute and 2 pi radians in a rotation we get

550*60/(2*pi)

 

zap-ouch