DietCoke

iTrader: (18)

Sure won't. See you in 3 months with your next disappointment thread.

wannafbody

iTrader: (2)

People who are getting in the 450 hp range are running larger cams with 230+ degrees duration. 410 is good for that small Summit Ghost cam on a 5.3.

AwesomeAuto

lol no. This isn't my first rodeo.

AwesomeAuto

The problem isn't the power, the problem is that it only gained 18 HP going from a stock cam to an aftermarket cam, when we typically see 40+ HP with cam changes of that size.

Summitracing

This is with the TFS-2500286 duals? We'd agree the lifters are suspect for the curve to look like that if you have the 2500286 springs or even a good TFS-16918 beehive. Our customers have been very happy with the SUM-HTLSKIT lifters. No failures and 53 reviews with a near perfect 5 star rating from everyone that's purchased them. $153.99.

AwesomeAuto

He either purchased the Cam/spring combo kit, SUM-8715-1 that comes with the TFS-16918, or purchased the cam/springs separate, but it does have the TFS-16918 beehive.
Also, the TFS-16918 springs were the only TFS spring in the "recommended parts" section with this cam, the duals were nowhere to be found at the time.

The Crane lifters were swapped to the Summit lifter kit and the valvetrain is noticeably quieter now, but it didn't gain or lose anything.

Summitracing

Thank you for the quick response. At first glance, the 410 and 380 numbers would be "ok" and representative of something with a heavier driveline. The thing that's wrong though is we'd expect to see a much bigger difference over a LS2 cam. 392 out of a LS2 cam in a 5.3 is remarkably strong. More importantly, we would expect way more torque from 3000 on up over the LS2 cam rather than catch up at 5700. Did you see anything strange in terms of KPA at WOT at the end of the pull?...not that it would have an effect on the torque though. Cam installed dot to dot with factory gears?

AwesomeAuto

Its a flat top gen 4 5.3 with 243 heads and an LS6 intake, controlled by a Holley Terminator X on a Superflow engine dyno.
392 out of the LS2 cam was exactly what I expected having done so many other 5.3s before. This was with 26* of timing, tapering up to 29* after peak torque.
It had only been making about 380 HP before the additional timing taper at the top.
It made 398 on E85 on its first pull while we were still dialing in fuel and hadn't added any timing when the drain plug came out and the engine locked up.

Cam/Springs/Lifters/Trunions/head gaskets are the changes other than new bearings and rings.
AFR is a solid 12.5:1, timing at 27* and it doesn't seem to pick up anything beyond that.
Summit Cam/Lifters/Springs. BTR V2 Trunions, LS9 head gaskets. Fresh TR6 plugs.
170-180 cranking compression on every cylinder. The previous 160 wasn't accurate.

Factory timing components, Ghost cam installed dot to dot.

Summitracing

Gotcha, sorry we didn't see the Superflow at the bottom of the dyno graph. We usually see 12-14% increase at crank vs. a typical dynojet. Yes, 390 is completely reasonable there and yes the Ghost should make 450hp+ and quite a bit more torque from 3000 on up. Something is up for sure, but hard to say what exactly. Factory pistons and replacement rings?

Darth_V8r

iTrader: (4)

I do agree with Diet Coke observation the graph does not look great at all.

Lsbmer

Try a fuel with mtb in it. Like vp.
Just to see. Sometimes that will
straighten the curve , right now!
Or like u said boost = Faster burn

Jays_SSZ28

iTrader: (2)

Why not do another baseline run with the original cam?

ddnspider

iTrader: (26)

Maybe some of you don't know who OP is, but he's more than capable and has been on here for years helping others under a different username. He has 1 of the coolest builds on this site. He's not an idiot, just had an odd problem. Everybody take a breath.

Oh,and he just had a gender reveal for his soon to be new born....maybe he's a tad preoccupied.....

Jays_SSZ28

iTrader: (2)

Oh, so it's ok to treat everyone else like they're stupid. But only if you don't know them. Thats ******* awesome.

ddnspider

iTrader: (26)

Don't you have another cam degree thread to make and then delete? Pot meet kettle with you in the auto trans section.

Jays_SSZ28

iTrader: (2)

But but but uh I have a newborn, ease up bro. Maybe you can help me out and make sympathy posts for me too.

ddnspider

iTrader: (26)

Ah, that's why your cranky. I just assumed it was that time of the month for you. No worries

Jays_SSZ28

iTrader: (2)

Seriously. You don't know whats going on in my life. You didn't say **** when everyone assumed I was just stupid. Why not? Why didn't I get a sympathy post?
If I was op I'd tell you to delete that ****.

ddnspider

iTrader: (26)

Because you're a ***** in other peoples threads, especially the auto section when someone disagrees with you. You have to give respect to get it. Awesome Auto constantly provides help to others on here with no ego attached. You should try it.

AwesomeAuto

The engine has been bought and paid for by someone else now, and he's honestly not nearly as concerned about the lack of power as we are.
He's getting one of those cheap $260 billet 7875s and its all getting dropped in a C10 that has probably 200 HP now.
When I suggested throwing the LS2 cam back in to help diagnose the issue, I didn't exactly get a favorable response.

FYI, all of the spark plugs looked great. All of the plug wires were new when it was dynoed with the LS2 cam.
The heads were hot tanked and cleaned between rebuilds.

At this point I'm not sure what kind of effort he's going to put into diagnosing, especially if the switch is being made to turbo and likely E85 in the very near future.
I'm going to recommend swapping to dual valve springs and flushing out the fuel system on the dyno to see if theres a noticeable difference.