408WS6

iTrader: (1)

Well, exactly. I mean...I know ET makes some of the best heads in the business, but those heads are a bit much for the street IMO. Probably damn good strip heads though. I never caught what intake it was? LS6 or FAST 90/90? If its LS6 that may be your problem. Those heads need at least a FAST intake. Those are great numbers anyway...

Ryne @ CMS

iTrader: (10)

he is running a fast

gtodoug

iTrader: (1)

correct Fast/90 ported by Tony Mamo. NW 90mm tb.

dougie

ls1408cp

iTrader: (37)

my setup is very much like dougs except I will have a ported victor jr with a accufab 4150 tb and the biggest kook headers i could get. i cant wait. thanks for the pm the other day doug

ArcticZ28

iTrader: (14)

Numbers look pretty low, could def run some more timing. My 408 with stock 317's/LS6/ported TB is giving me 410 ft/lb of tq at 2800 rpm, 445 peak at 5200. Looks like you've got a lot left in that once you get timing and exhaust sorted out.

gtodoug

iTrader: (1)

Arctic, thanks for the advice. As soon as I get the exhaust/timing issue sorted out I'll post back some results. Keep in mind, I'm just a homegrown tuner. No expert here, so that may be part of the issue as well. No fair to compare mine to yours though, two different setups, you may have me beat at 2800, but I got you beat by 100wtq at 6000rpms And like my setup, I know your's isn't finished either.

ArcticZ28

iTrader: (14)

Of course, it was just to show that if I can make x with this horribly restrictive setup then you can obviously make x^2.

gtodoug

iTrader: (1)

You just pointed out something very intresting . I never stopped to look at how aggessive my burst KR table is. As I'm looking over my HPT Scanner log the Burst knock table is too aggressive. I remember increasing it alot just to be safe and never really looked at it again after that.

Burst Knock: A table setup to pull timing upon rapid throttle transitions to avoid knock retard. You can control how aggressive or non existant you want this.

I could kiss you right now Arctic. Take a look below:

The combination of running 12:1 a/f ratio and 7.5* of timing = now power down low. Now I know I can work on another area. The table now is setup to aggessively pull timing from 2400 and not retain full timing until 3200rpms. At 3200 I'm still at 12.2:1 a/f so cleaning up the timing and a/f should make for some intresting results.

Arctic, I wasn't trying to get in a pissing match or anything, just trying to be funny but then started looking at why the tq difference was so great. Well, back to the drawing board!

383ss

iTrader: (14)

its not pulling any knock timing though.

gtodoug

iTrader: (1)

No, I never said KR, I stated burst KR

Sport Side

iTrader: (6)

I don't think you are seeing the affects of burst KR but instead just lack of timing in those cells.
Pull up your histogram and see what your timing is at:
2000RPM - 50% TPS
2500RPM - 75% TPS
2500RPM - 100% TPS
exc.
Bump those up.

BTW. I'm confused on this.
Your current cam was designed around another setup or the one you are currently using? You were mentioning different heads and 2.5'' exhaust and I got kinda mixed up on this.
If so, have Ed do you up another cam down the road.

How are the track times? Didn't you run it already? Seem to be in the ball park or are you slow at the track too?

ArcticZ28

iTrader: (14)

No no, I know Glad I sparked some ideas

How bout instead of kissing me you just toss some ETP heads my way

gtodoug

iTrader: (1)

Sport Side-I'm not getting any burst knock. I have my Burst knock retard table set too agressively. Timing is not tps driven as you know, at 100%tps I'm commanding 18* of timing. I don't get my full timing because I have the computer setup to pull timing upon rapid throttle transitions. Are you familiar with this table or am I missing what you are saying?

Dougie

383ss

iTrader: (14)

but you are saying you can only run 17* before it starts pulling timing? I don't see burst knock being a big problem as far as dyno results go. it recovered from it by 3000rpm.

gtodoug

iTrader: (1)

383ss, you are correct in saying that I can only run 17* before I start to get KR. Arctic and I were speaking of tq available at 2800rpms or so and how mine was so low. With the burst kr table being overly aggressive from 2500-3000rpms my tq curve was especially weak. Maybe by desensitising the table and running it leaner than 12.1ish I can pick up some tq down low. That's all. I'm not stating it was a problem for the entire pull.

dougie

98Z28CobraKiller

iTrader: (17)

Freakin sweet!

98Z28CobraKiller

iTrader: (17)

There's one of your problems right there. Tony's intakes only work with AFR heads. Lucky for you I will take it off your hands, at a reduced price ofcourse.

gtodoug

iTrader: (1)

Oh no my friend, it actually had to be opened up about 1.5mm in width on the intake runners. Other than that it bolted up just fine. LOL, got get some hp somewhere else

Dougie

98Z28CobraKiller

iTrader: (17)

Well I looked at the scan that you sent me and now I am wondering why you are able to hit cells over 1.00 in the g/cyl side of the spark table log and my table doesn't even go above 1.00 and I am only able to hit .76 at WOT.

gtodoug

iTrader: (1)

Your spark table should have cells up to 1.20g/cyl. What version of HPtuners are you using?

Dougie