ddnspider

iTrader: (26)

Quoting myself here as this is my hit list for what I'd want to see.
OP yes IDC is injector duty cycle. And the stock ECM is open loop at WOT so there is no fuel compensation. The way it works is whatever the last fuel trim when in closed loop right before you go WOT is used as a fixed adder. If your fuel trim is negative it doesn't pull any fuel but doesn't add any either.

Floorman279

iTrader: (11)

he did do a pull without the y pipe and had extensions...i don't have it to show but he said no difference

ddnspider

iTrader: (26)

That checks 1 thing off the list I posted.

Bspeck82

If compression is in check and no vac leaks I'd look for fueling issues. If pushrods are too short then you could see a loss of power. A stout heavy powertrain will also suck up a ton of torque and actual power could be misrepresented on the dyno.

spanks13

iTrader: (5)

He has adjustable rockers.

Which short travel lifters do you have? How much lifter preload is he setting it up with?

I doubt there’s fuel pressure problems with twin pumps but it’d be worth checking at least once.


Soooo does Tony have any input?

ddnspider

iTrader: (26)

He said the 2nd pump isn't turned on yet.

Bspeck82

This.

I realized that theory and practice usually net different results. I'm pretty certain a single 250lph pump would be barely adequate for these power levels. Isnt that good for about only 550 crank?

ddnspider

iTrader: (26)

You can do 500whp boosted with a single 255 with a hot wire kit, so an NA setup should support about 600whp but setups vary obv.

Floorman279

iTrader: (11)

everything from the flywheel to tires is exact same parts that dynoed 459 405tq with my ls1 with a 236 238 cam, fast 90, heavily ported 799s so honestly it's not terrible those are good numbers. that was a different dynojet tho

Floorman279

iTrader: (11)

yea 600 rwhp is a single electronic with hotwires limits. I think u can get 550 no hotwire. that's y I said mine as well run doubles cause eventually I will be over 600, hopefully.

don t really wanna bother Tony anymore. this is the 3rd time I had to bitch about my problems with him.

Johnson 2126 right, the .058 travel with axle oiling. him and I like .030 preload.

you guys did see i mentioned after first dyno, heads came off to address pushrods hitting head.heads were not skimmed before reassembly but new gaskets were used

ddnspider

iTrader: (26)

When you spend the kind of money you are with a sponsor you better freaking be able to contact them when you have a concern. You've still got a hit list of stuff from my posts to check out.

Floorman279

iTrader: (11)

I know I have reached out. he's upset I'm running the crowers, and could see valve float, this was before I ran the heavier springs.

correct, unsure of when the tuner will get another shot at this so when he does I'll post back. got a few suggestions from u guys to pass to him

ddnspider

iTrader: (26)

Get the graph in SAE too and lower smoothing too, it may help show signs of instability.

Floorman279

iTrader: (11)

ok good tip

99 Black Bird T/A

iTrader: (4)

Sorry to hear the car isn't performing as expected. That's really frustrating.

Have you been able to drive the car any on the street?

My only thought is getting some street/highway miles might help ID an issue that isn't showing up during a brief dyno run
.
I found an issue with my RS that didn't show up on the dyno.

Floorman279

iTrader: (11)

at one point we tried a set of ls2 coils. not much diagnosing has happened after spring swap

Floorman279

iTrader: (11)

here is the uncorrected graph with smoothing off

Floorman279

iTrader: (11)

tuner said

injector peak at 6400 rpm, pulse width at highest is 15.4 ms and drops to 14.2 ms by 7100. maf shows air speed leveling off there also which indicates an air flow problem which makes me think its a flow problem or valvetrain issue.

he also said, smoothing on 0 u can see a pulse up top which also leads me to think valvetrain, becuase less timing didnt help so its not a detonation issue.....

ddnspider

iTrader: (26)

What injectors? That looks pretty wavy up top. Seems like the tuner should have brought that up. I can't read the pic well enough, are the SAE numbers higher than STD?

Floorman279

iTrader: (11)

he likes Holley stuff, so we got ls1 height 42 pound Holley so we don't need adapters for the injectors.

I dont think he looked at the std numbers without smoothing, which yes are higher than corrected numbers. u can click on pic and it gets bigger