Sales@Tick

iTrader: (3)

What/who's springs and components are you running? Is your installed height correct? Can you verify installed height with a spring mic?

prokilllsx

Brian Tooley .660's went in 1,000 miles ago in an attempt to correct the issue. They were installed at 1.78 initially. When the dyno showed no improvement Brian Tooley advised going to 1.75 installed height. The adjustment was made. New dyno showed no change. Brian then advised checking pr length. It was determined that the 7.375's that were in it were too long and creating too much preload on the lifters (for 10,000 miles or so). They were replaced with 7.350's per pr length check results. Car seems quieter and happier but no change on the dyno.

COSPEED2

iTrader: (7)

What is your fuel pressure at the problem point and after? Just because you can hit a target afr doesn't mean you are getting enough fuel

prokilllsx

58 pounds.
Let's say it was running out if fuel...would that tear up the valvetrain components I mentioned?

Brian Tooley Racing

iTrader: (13)

This is the best indication that it's not valve train related.

If a engine has trouble turning RPM at higher engine loads it's generally ignition related, which seems to be fairly common in LS swaps. My guess would be electrical grounds or something wiring related.

JakeFusion

iTrader: (7)

That looks valvetrain related. However, I'd check the fuel pump and ignition first. They can do that as well and will be easier/cheaper fixes. If those both check out and nothing changes, you're probably chasing ghosts and either need to take it to a shop or go ahead and tear into it. As TSP said, this doesn't have the most aggressive lobes on the planet, so it shouldn't take monster springs or shimmed springs to control them, so if it's not ignition or fuel related, it has to be deeper than the springs.

So, if it were me, I'd check the fuel and ignition system exhaustively. If they are working correctly, then I'd pull the heads and the cam, inspect the lifters and the cam lobes and see how they look. If they are damaged, then you know you had a system that was out of control and the lifter/pushrod combo would be the first thing I'd change and then I'd shim up the springs and swap the cam. If not, then you'll likely need to start over again. It's making good power, so the combo isn't crap.

thunderstruck507

iTrader: (18)

I am running the 230/238 cam you mentioned. It is paired with some 799s that have hand cuts to the intake side valve boss and removed rocker bosses, otherwise they have nothing but hit with sanding rolls to knock off the casting flash. Exhaust side had sanding rolls only. Milled .010".

Car ran a best of 11.67@115mph (best trap was 116mph) in 2000 DA on 1.72 60ft with it hitting the rev limit on the 2-3 shift. Car weighs ~3700lbs with me and fuel and has the front end of a brick.

Made 390rwhp through unlocked stall and closed cutouts, peak at 6300rpm but carried out pretty good. Based on previous runs with it locked I would say it would be around 410rwhp locked. Car has a 12bolt and a ridiculously heavy 3.5" chromoly driveshaft which is 56" long.


For reference, with a Comp XE lobe copy of the TR230/224 cam and stock heads the best it ran was 12.24@110.38 mph in similar DA. All other mods were the same.

prokilllsx

Thanks guys. Cincy Speed is supposed to start on the car monday. I'll let you know what they think and find.

Brian Tooley Racing

iTrader: (13)

Just for entertainment purposes... F1X supercharged RHS 388 with BTR/TFS 245 heads, Holley Hi Ram, BTR cam and the Platinum springs shimmed to 1.750" with 40 lbs of boost.

Sales@Tick

iTrader: (3)

That was my next step Brian, you read my mind.

What would explain the torn up seals though?

Sales@Tick

iTrader: (3)

Now you're just showing off.

prokilllsx

Yes, he was, but I liked it

prokilllsx

They started digging into it yesterday. Turns out 6 valve seals are popped out. Heads come off tomorrow.