iansane

Posted on almost all the other thirdgen specific boards, figured I'd hit this one in case anyone missed it.

224hp and 247ft/lbs of torque

'91 305 HSR + lt1 cam + t56. Everything else is completely stock. The log exhaust manifolds and stock program included. If you look at the AFR graph at the bottom you can see that with stock tune it gets pig rich from 2500 up until 4500. Just poping this up here to help anyone. It's definately an overkill manifold for the 305 but does provide a very broad flat torque curve.

Opinions? Thoughts? With tuning and full exhaust I'm sure you could squeek out quite a bit more. Heck, with head porting, more agressive cam, 1.6 rockers I bet it wouldn't be that hard to 300hp. Although I'm not even touching that kind of thing, going straight to an ls1.

teke184

man that is one hell of a flat curve.

wonder how much the a/f is killing it?

how much does the LT1 cam make on stock (or near stock) TPI? i know the tpi is awesome for torque...i would think 300# wouldn't be hard, but the hp wouldn't be there

85_305

Impossible. I want to see proof that a boat anchor makes more than 120hp

thirdgenrallysport

not bad i guess, but i didnt mess with my 305 at all really cuz i knew it would never be fast enough.

85_305

On a more serious and realistic note, that's some nice hp. I'm assuming that was originally TPI motor?? Oh and why is the torque lower than a stock v6's lol?

iansane

As far as spending money on this, if I hadn't decided to go the LSx route I haven't spent any money on this 305 that I can't directly drop in a 350 if I so wanted. Other than gaskets, replacement waterpump, and a $10 lt1 cam and $30 brand new valve springs.

Yeah, it's the stock block/heads from my TA--so it was TPI. And the only v6 I know of that came in a thirdgen with over 250 ft/lbs of torque was the tta. Which other ones came with that?

Another guy that put his RS up on the rollers pulled down a hair more torque and 1 hp less than me with TBI, some tuning, a manifold (not sure what kind) a slightly more agressive cam, ported 416 heads and shorty headers.

85_305

LOL I was being sarcastic But 305's come with 245 lb's of torque stock; that is quite a bit under that

iansane

You know that's measured from the flywheel, right?

85_305

Well ya but still. That still somes quite low

doug791

With a 20% ish parasitic loss through an auto, compared to factory numbers no that doesnt seem low for a 305 with an intake and cam.

I dont even think he has headers on it, having more air coming in dont help much if ya cant get it out.

In a couple months my motor needs to be rebuilt, and its getting a HSR, 225/235 duration ish cam, mildly ported l98 heads (already done), and already have slp headers into a 3" mandrel bent exhaust.

Seeing how flat that power curve is with the hsr makes me reeeally excited and is probably the final step in convincing me to break emissions laws hah

thirdgenrallysport

mabye some day ill have enough money to do a dyno day and post my dyno numbers on the 383hsr.

85_305

Oh that's true.. good point on both counts

iansane

I would think the loss would be a little less through a t56? And yes, I need to get headers on it.

And I realized why it was so rich for most of the run, my fuel pressure is set way too high. Not like that's too terrible though. Even set that high I'm getting 24mpg city/freeway and 27mpg straight freeway.

RedIrocZ-28

That AFR curve is probably killing nearly 50 hp on you at the crank, but I would think that new valve springs would aide you in that also. Realistically you want a 12.5:1 air fuel ratio to get max power out of that setup, and you need to have more Accelerator Enrichment added in there, you go pretty lean when its tromped on there, going above 15.0:1 yikes!