LLave Posted October 26, 2009 Share Posted October 26, 2009 (edited) I would like to do a fuel injected SBC with about 400-450hp for my Z, on a reasonably cheap budget. I have this 350 TPI motor that was supposedly nicely built, but i have no idea what exactly is in it. Is it good money after bad to even attempt to reach my goals with it? Would i be better off just selling it for whatever i can get and going for a LS1, LQ4, LQ9? What to do, what to do? Edit *doh, nice type-o in the title Edited October 26, 2009 by LLave cuz I can't type. Quote Link to comment Share on other sites More sharing options...
grumpyvette Posted October 27, 2009 Share Posted October 27, 2009 (edited) you can very easily reach your 400-450hp (flywheel) goals and its rather silly to swap engines IF you already own the 350 sbs, simply because you'll be adding the cost of the new ls series engine to your total expenses, and with either engine choice youll still need speed parts that cost a couple thousand minimum, and sbc parts tend to be cheaper and easier to find. as always its the selection of those components that will make or break the results sop do your research read thru these http://forum.grumpysperformance.com/viewtopic.php?f=69&t=519 http://www.airflowresearch.com/articles/article085/A-P1.htm http://www.highperformancepontiac.com/tech/hppp_0910_dyno_testing_the_tpi_chevy_small_block_engine/index.html Edited October 27, 2009 by grumpyvette Quote Link to comment Share on other sites More sharing options...
bschiltz Posted October 27, 2009 Share Posted October 27, 2009 http://www.firstfuelinjection.com/products.htm If you have the money, I've heard some pretty good stuff about this intake. Otherwise a ported TPI setup can make pretty good power as well. http://www.superchevy.com/technical/engines_drivetrain/induction_poweradders/sucp_0703_stealth_tpi_induction/dyno_test_results.html Quote Link to comment Share on other sites More sharing options...
WildBill Posted October 27, 2009 Share Posted October 27, 2009 A TPI 350 is no slouch, heck, a 305 TPI would go pretty good in an IROC Z with damn near stock setup - shift into OD at about 120 if I remember correctly. And a Z car is much lighter, or course! Quote Link to comment Share on other sites More sharing options...
Guest m33pm33p Posted October 27, 2009 Share Posted October 27, 2009 5.0tpi came 235hp 300ft/pnds stock 5.7tpi came 290/350 ft/pnds 400+ hp is very easily attainable with simple bolt ons and a new ecu for these motors. Quote Link to comment Share on other sites More sharing options...
Dan Juday Posted October 27, 2009 Share Posted October 27, 2009 Wow, look at all the respect for the lowly tpi. And no plastic motor covers required. Quote Link to comment Share on other sites More sharing options...
LLave Posted October 27, 2009 Author Share Posted October 27, 2009 Those first manifolds are nice (http://www.firstfuelinjection.com/products.htm) but the pricing starts at $1000 that is a big chunk of a complete LS1. That L89 is very cool but again they have well over $1000 into porting their manifold (porting by extrude hone is not cheap!) It seems i can get a nice used LS1 for about $3000, save some weight and be close to my goal right off the bat. But I think what grumpy is saying is to take that 3k, get a inexpensive summit stroker kit, invest in some heads, port the intake, get some SLP runners and call it good. Correct? Quote Link to comment Share on other sites More sharing options...
Pyro Posted October 27, 2009 Share Posted October 27, 2009 stock tpi is good for 5500 max, due to an intake made for torque. 350hp is about it for the stock intake. Quote Link to comment Share on other sites More sharing options...
LLave Posted October 27, 2009 Author Share Posted October 27, 2009 I am sort of considering taking a victor jr. welding in some bungs, putting an elbow on to a 90mm GM throttle body and controlling the whole mess with a megasquirt (i already have one) Quote Link to comment Share on other sites More sharing options...
Pyro Posted October 28, 2009 Share Posted October 28, 2009 then you could get 400hp with the right cam. The next power restriction are the heads. Quote Link to comment Share on other sites More sharing options...
bschiltz Posted October 28, 2009 Share Posted October 28, 2009 http://www.thirdgen.org/siameseport I just stumbled upon this, seems interesting. I'll try to find the dyno results it references. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.