http://www.superchevy.com/technical/...ion/index.html

well.. to start, its done by Super Chevy, who i trust. However, these numbers seem alittle high to me. too much go for too little dough if you get me?

Also, would this be the limit of what the engine can do? Is there any way to get more power out of this setup? It seems like its making amazing power for what it is, but i still want more power. What would siamesing do? How about an Air foil?



i ask because this seems like this is an amazingly cheap setup for the power. However its not QUITE what i want. i wanted about 50 more hp and torque out of my 383. Still, i love the TPI monster, and i dont really need high end torque (im not building a screamer.) But this build seemed fishy to me for no real reason at all, so i wanted some professional TPI opinions.

my second option is RamJet, which should have more potential, run better, and just be better overall, but will require alot more $ and work, and lose that "stealthness" of the monster TPI.


A penny for your thoughts? Thanks alot!

~LMSkyliner

 

I can't offer a 'professional' opinion, but I bought my '91 Z28 new in December '90, and I followed the magazine articles of the time ('91 - '98), and I purchased the same hipo parts used in the article(s), and my car never produced the power numbers the magazines, or the part producers, said would be produced. Sure, my car gained power, but not the magic gains the magazines seem to get. Your experience may be better, and I hope it is (as long as your car isn't faster than mine...) Bill

 

yeah.. I;m worried that ill dump all my minimal amount of $ into a setup that will never give me what i need. Like i said, Super Chevy seems reliable, but those dyno numbers seem high all around to me. Every number they threw out seemed kind off... high really. im not sure. I just have a bad feeling about the build if i did it like that.

~LMSkyliner

 

Electric water pump
NO accessories of any sort
Open exhaust

Possible? Yea. Especially a extrude honed 383 with a cam and TPIS/ASM runners.

Cubes of salt needed to read that article. 36# injectors... no reason for those either. Weird build.

FYI I have a 350 with a cam, ported AFR's, Edelbrock base (no choice), and stock runners with a ported plenum and a probably useless 58mm TB and its probably making 410-420 at the crank with a full exhaust and all accessories in place. So those numbers dont look out of line given what they did and how they tested it.

 

interesting..

what do you think my build would produce off the top of your head? I plan on going with fully forged rotating assy, some unknown piston tops (plan on it being pump gas friendly, but just barely. Ill let u take your own guess at the compression), some kind of (most likly aluminum) heads making some nice power, and if i want TPI, somthing like the big mouth manifold, some aftermarket runner taken out as far as theyll go (more air plz!! lol) and a highly ported plenum, along with a little meaner camshaft than stock and throttle body, CIA of some type, and maybe an air foil if itd still help power. I really dont know what it does to a ported plenum, or if it even works still.
oh, and full exhaust, probably from Dyno Don. Dual Cats.

 

On second thought, I reviewed their 'dyno sheet' and the peak HP RPM looks high for a TPI manifold. But I still think that power level is obtainable, just not there at 6000 RPM. It should and likely did nosedive past 53-5400.

Spend your money on heads. I'm not sure it really matters what you get, either some well ported Vortec heads or something like AFR, Brodix, Dart, etc. A cam with intake duration in the 218-225ish range will idle and tune well especially on a 383. The intake... I guess it all depends on where you want to throw your money. A stealth ram is inexpensive, still looks ok, and will get the power level you want with the least hassle. If you want to stick with a TPI you may have to fight with it a little and make sure the rest is up to the task. If you check on the recent posts by some of the local socal members here on the TPI board about the base and where they've been welding it up, you'd want to do that and possibly runners. I'm currently still using stock runners so... you can make decent power but of course it has its limits.

 

well. if i dont go with TPI, ill be going with Ramjet since i have connections within GM. I have another thread on the alternative EFI board about the ramjet, and it seems like it may be a pretty good choice. I just love how the TPi looks so i wanted to see if there was any possibility of using it.

What do you think.. should i stick with TPi or is it too much of a hassle?