JJ 86

iTrader: (4)

Finally, worked out my tuning issues last friday and got the car on the dyno. It put down 387 rwhp and 357 rwtq. Mods are comp cam 226/231, 7.4 hardened pushrods, ls6 oil pump, Ls2 timing chain, dual valve springs, Lt headers, powerbond UD pulley, fast intake, vararam, catted x-pipe, and b&b bullet exhaust. So far I am pretty happy with the results as I am still using the stock 806 heads.

JJ 86

iTrader: (4)

I will post up the dyno sheet later.

JJ 86

iTrader: (4)

2QUIK4U

iTrader: (7)

Torque seems kind of low. Im sure the heads are holding you back. Get a good set of heads on there and you should be well over 400rwhp.

*02WS6TURK*

iTrader: (13)

Yeah, torque is on the low side.

JJ 86

iTrader: (4)

I'm sure the heads are whats holding me back. Overall, I'm satisfied for now.

*02WS6TURK*

iTrader: (13)

Post some pictures of the ride

kinglt-1

iTrader: (26)

I agree the heads are holding you back a bit. get a set of ported 243's if your on a budget, or a fast 102 w/ some tea trickflows if money is not an option lol. Nice ride and good numbers!

Damian

iTrader: (89)

#1 - The #'s are fairly low. Especially for a FAST manifold.

#2 - The heads aren't "holding you back". 806 castings are 5-8cfm at best down, against the newer LS1 castings. 5-8cfm isn't going to hold back 20-30HP. That's an internet myth.

The HP isn't terrible for running through cats, but the TQ should be much higher with a decent size camshaft like that.

Damian

iTrader: (89)

Also, most generic XE or XE-R Comp lobes require a 7.425 or 7.450 pushrod on stock heads.

VincesSS

iTrader: (1)

That and they are lower compression I thought.

jc98ss

iTrader: (13)

I'm throwing in a 227/231 LSL lobe cam tomorrow on 110 lsa with some Pac 1518's.....i have the same 806 heads and I was hoping to be a little closer to 400/400 hp/tq......OP, like Damian said, I would check into slightly longer pushrods.

kinglt-1

iTrader: (26)

the heads are holding him back 10-15hp at best comparing the 806 vs 241...

Damian

iTrader: (89)

5-8hp at best, and that's a stretch.

I squashed this internet myth many many years ago when I swapped 241's on my 98. I gained absolutely zero power, and the car ran the exact same at the track.

806's aren't a desirable head due to the crappy valve covers and coil mounting situation, but when it comes to stock vs. stock cfm there isn't enough difference to claim a 10-15hp difference. That would be like going from a set of 241's to 243's. The difference in 806/241 is NOT that vast.

DONAIMIAN

iTrader: (18)

There is absolutely no port difference between the heads. GM switched to a different casting method which resulted in a slightly smoother port but that's it.

DONAIMIAN

iTrader: (18)

Kinda. The motors have the same compression. One head has a slightly larger chamber, but gm also used a different thickness head gasket so compression never changed.

kinglt-1

iTrader: (26)

you said the 241's have a 5-8cfm gain over 806 heads..." I thought 1cfm = 2hp(roughly)?? Thats what I based my last post off of. Anyways you work on this stuff enough to know, no argument here!!

thunderstruck507

iTrader: (18)

How much power would be lost with too short a pushrod?

My cam is a Comp grind .576/.563 lift IIRC and I was told to just order the 7.4 pushrods so I did. Wondering if I should measure...but then again I'm likely going to need something different when I put the milled 799 heads on so maybe mine will work.

I need to order a pushrod tool. But just curious, because my car also has low TQ for the mods and IMO low power/trap speed.

kinglt-1

iTrader: (26)

always measure pr length... incorrect legnth can cause a substantial loss in tq/hp! If they are too short your not getting the full lift your cam is spec'd at.

Johnnystock

iTrader: (6)

I'll say that those numbers doesnt look bad to me; I'm only at 405rwhp, with CNC ported 243s and bigger valves+ported FAST intake, which suck for those mods(smaller cam TR22x). But you know what? it always depends on the dyno. I run way faster than many high dynoing cars(at the track and street too). So dyno are a tuning tool afterall.

Your torque seems a bit low though.

And I see that your FAST is a 78mm too..