81s

Well after fighting many noob battles. I went to dyno my truck
6.0
Ls3 heads
Tsp231/236 cam
4l80e with restalled factory converter 28-3200 ( was only looking for 2800)
3.08 gears


Truck dynod at 256hp @ 5300 267.45 tq rpm and started to fall off at 5300
Tr6 gapped at .40

I have headers (schnoenfelds ) i think 1 7/8 with dyno max ultraflows 3" all way no tail pipes.
Factory cai ( parts didnt arrive for cai. yes i know but 200 hp short)

I think converters broke because it wont do a burnout at all but any body else got stuff to check.

Doing compression check 1st. I did 2 cyls after 1st startup i was at 175psi. Im re doing all to see.

Any other suggestions?

DietCoke

iTrader: (18)

what valve springs are in it? that cam should make 400ish through a 4l80 in a truck with a 6.0 and ls3 heads. 4L80+3.08 isnt doing you any favors, either. get some 4.10s

81s

They are the .650 springs that came with the cam kit from tsp.

trying to post graph but tuner beat me up about cam choice and swore it was the problem.

recommeded this
COMPETITION CAMS 54-470-11
GM LS LSR CAM -285LRRHR13

Specifications
RPM Range: 2200-7200
Lobe Separation 113
Intake Centerline: 109
Duration: Intake 285 Exhaust 301
Duration @
.050" Lift: Intake 235 Exhaust 251
Valve Lift: Intake 0.621" Exhaust 0.624"

HYDRAULIC ROLLER-Very strong from mid-range to high end torque and horsepower for LS engines with rectangular port cylinder heads.

Notes:

81s

working on gear and unit now. took to tuner because with the mail order tune it wouldnt run at all in drive. it would idle and fould plugs but that was about it.

thinking 4.56 because i plan on runnng a 31"+ tire on back. i was expecting much more even with what i brought to the table for now. heads are cnc ported and.

can all that be converter or should i be lookng at valvetrain still. incorrect pushrods or ?

81s

i see other people have good results with that cam... was i really that far off?

i forgot to mention its a nw92 and l92 truck intake

redtan

iTrader: (5)

Lol I was going to ask, who did the tune. Seems that this "internet tooner" doesn't really know what he's doing. A properly tuned car should not be fouling plugs while idling. That thing must be running sub 10 AFRs at idle, yikes!

1989GTA

There is nothing wrong with the camshaft that you have. You need to look elsewhere. How does it run now? Also what brand of dyno was it?

81s

Dynojet i mailed whole computer to texas speed. Dont have a copy of tune now either tuner did it while i waited on the dyno. Pic upload keeps saying failed. Ill try again today

dinnut123

Here is the graph of the pulls that were made

DietCoke

iTrader: (18)

That thing has some serious valve or ignition issues. Graph is wave as hell, even on smoothing 5

726.0chevelle

iTrader: (17)

Is the 6.0 a lq4 or lq9? That cam choice does seam quite big for a heavy vehicle with 3.08 gears and only 2800 stall.

81s

Valve or ignition issues? What and how do i need to check? According to tsp only need 2500+ Stall but i am in need of one since my intown restaller did not work out so well

Engine is 6.0 block forged flattops no valve releifs. Its getting gear too. Waiting on income tax for install already got ring and pinion. i tuned 1st because its hard to move around when it cant go anywhere in drive

My buddy dinnut said same thing about waves in the graph. Improper preload or ??

DarkblueTA

^^^Agreed

81s

So other than a compression check on all cyl what else would yall like to see? Should i pull out all the pushrods and restart that process? Any suggestions. I may be able to get spring pressure tester from a buddy

poltergeist 02

iTrader: (65)

Do a leak down test and I would like to know the entire valvetrain setup, preload too.

DietCoke

iTrader: (18)

could be wrong pushrods, a broken valve spring (Tsp springs are junk), or a bad plug or wire or coil. if it had a shitty tune it just wouldnt make power, the graph wouldnt be all crazy.

81s

Just left circle d this morn $920 later 3600 stall be ready tuesday

81s

Poltergist

Tsp 231/236 with ls7 lifters prc 650 springs 7.4 pushrods. Ls3 intake rockers. Factory lq4/9 exhaust. Undecked to my knowledge heads

01WS6/tamu

iTrader: (37)

A high stalled auto usually dyno's low couple that with power hungry 4L80 and lousy gears and the problem lies mostly in the combination. Get some 4:10's under it and the tune dialed in and you will see a big difference.

81s

Ok back from the dead... Went to the track with Circle D 3600 and 4.10s .. Only 1 pass due to no helmet 8.19 1/8th @ 85mph. Going back for a retune saturday morn after Ls7 maf and 4"Cai install. What are yall expecting to see new numbers