TPITuned Port Injection discussion and questions. LB9 and L98 tech, porting, tuning, and bolt-on aftermarket products.
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I've read the various "banned topics" threads, but for the most part are still left scratching my head. I'm a complete idiot as far as the 305 is concerned, no experience with it at all and not much with SBC in general.
I'm building a Lotus 7 kit, and was originally going to use an LT1 I had found but that deal fell through, not to mention the T56 tranny is damn expensive. I've now got a lead on a 5-speed 87 TPI from a Firebird GTA. As starters the car will have a "cold air" intake, custom headers, custom exhaust, these are required to get it to fit into the car. Oh, and no emissions gear as the car doesn't need to meet emissions as a kit car.
The engine itself is bone stock, so aside from those pieces, and keeping in mind reasonable $$$, I'm looking for suggestions on "next steps." Effectively as the "banned topics" thread suggests, intake base, cam, and heads are what I'm looking to do. I'm looking for higher RPM power rather than tree pulling torque. Obviously budget is a concern I've got around $1000 to "refresh" this engine. So with that budget I might not get everything I want first time around. What I don't know is who makes the various parts for these engines and what I should watch out for. Seems most of the aftermarket focuses on the 350.
So I'm not sure who makes an intake base for example for this engine and which one works well.
As for cam, obviously I want someone that will work with the head. That said companies like Edelbrock and others seem to have heads for the 302, 350+ but no mention of the 305. So what head choices are there? I don't have any issue running higher octane pump gas with the engine so compression ratio etc are all on the table modification wise.
Finally cam, I don't care much about 100% "streetability" of the engine, it's effectively going to be a Sunday driver and spend 90% of the life at the track road racing.
What about other things like pistons? ECM programming?
So suggests on where to start?
Thanks again and sorry for such a newbie set of questions.
For those not familiar with the Lotus 7/Locost, here's a pic of the type of car I'm building (mine will have a full cage however), my blog can be found at http://www.brutusv8.com/ car will weigh in at 1600lbs and I'd like to squeeze 300hp out of the 305.
Paul
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the tpi isnt meant for high revving nor will you get it to rev really high with mods maybe a little higher than stock. as for 300hp youd need heads,cam combo that works well and maybe port the tpi setup. seeing as you only have 1k to spend best off getting a computer friendly cam zz4 maybe and forget aftermarket heads. you can port the 081s and get those fixed up and be in good shape. just make sure you run it with the MAF sensor thats on the car youre getting.
the tpi isnt meant for high revving nor will you get it to rev really high with mods maybe a little higher than stock. as for 300hp youd need heads,cam combo that works well and maybe port the tpi setup. seeing as you only have 1k to spend best off getting a computer friendly cam zz4 maybe and forget aftermarket heads. you can port the 081s and get those fixed up and be in good shape. just make sure you run it with the MAF sensor thats on the car youre getting.
Yeah, I've been doing a bunch more reading and see that TPI doesn't give much in the way of top end power. So be it.
Im in the same hole as you man.My thought is to just get a 350 tpi eng or if you dont want to deal with the tpi sytem then just got with a 350 and work with a carb setup if you dont want to deal with the bay cluter
Ill tell u my combo which is putting 216-220 at the wheels (wasnt running the best for the dyno run so it had more in it). Its a 305 with a LT4 cam (zz4?), AS&M runners, Edelbrock base, ported plenum, Edelbrock shorty headers, and a 3 inch exhaust. Now if u add in a few more goodies like heads, roller rockers and a better tune than i have (tpis did the tune for the previous owner) you should be barking at 300hp. Oh yea my combo pulls all the way to 5000rpms where the original motor bone stock would die after 4k.
[quote]I'd like to squeeze 300hp out of the 305[quote]The power you want would be easier to get out of a 350.I t can be done with the 305 though.350`s are easy to find and can make more power easier.
Quote:
Ill tell u my combo which is putting 216-220 at the wheels (wasnt running the best for the dyno run so it had more in it). Its a 305 with a LT4 cam (zz4?), AS&M runners, Edelbrock base, ported plenum, Edelbrock shorty headers, and a 3 inch exhaust. Now if u add in a few more goodies like heads, roller rockers and a better tune than i have (tpis did the tune for the previous owner) you should be barking at 300hp. Oh yea my combo pulls all the way to 5000rpms where the original motor bone stock would die after 4k.
Subroc do you have the LT4 or the (ZZ4?cam)I`ve never dynod mine but It feels like it pulls to 5000 rpm with the stock tpi Or atleast very close to it.Although I realize that is where the stock tpi limits are.Its nice to see about what you dynoed if that is the LT4 cam.I just picked up a tpis base off of ebay and was hoping it would pull to 5500 with ported plenum and aftermarket runners.Thats only 300 rpm`s off the LT4 peak HP rpm.I was hoping to get (thought I`d be lucky to get)300 hp at the flywheel out of my 350 with that cam.
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5.7,ported plenum.ported/polished/siamesed SLP runners & ported/polished TPIS base,LT4 production cam w/1.6 R.R.
ZZ4 heads,Hooker 2460 headers w/full 3" exhaust
2500 stall,3.42 gear,suspension mods.Full list of mods in VB garage.
I was told by the previous owner it was an LT4 cam (not the hot cam). Thats different than the zz4 then right? that was why i had the question mark i wasnt sure.
As far as your 300hp at the flywheel with a 350 that is very doable IMO. I mean mine is only a 305 and im at 216 at the wheels which at the flywheel is what...250-260? Somewhere around there?
for a budget deal, and since emissions are no problem, I'd look at the LT1 intake converted for TPI use. Don't know the url, but its pretty easy to find via google. You solve all your bs TPI problems at once, and get more power potential up higher in the revs.
for a budget deal, and since emissions are no problem, I'd look at the LT1 intake converted for TPI use. Don't know the url, but its pretty easy to find via google. You solve all your bs TPI problems at once, and get more power potential up higher in the revs.
wow, this is a pretty old post.
I bought an LT1 in the spring with T56 and used that. Drove the car for the first time a few weeks ago, BLINDINGLY FAST. http://www.brutusv8.com/ to see a video of one of my test runs.
open up the intake, do a cam. As long as its running efficently ie: good tune, sensors working properly, fuel and air mix is good. With that light of a car, that will be an animal, It probably wont hook up for sh*t, which i think is a good thing. a tuned port 350, may even be overkill in the tq department with that car. Either way a strong running lb9 in there, we be tons of fun im sure.
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wow, sorry, i didnt realize the post was so old, ignore what i said.
Last edited by 8T9 BANDIT; 11-12-2008 at 01:09 PM.
Reason: Automerged Doublepost
