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Got my car tuned by Synergy Motorsports a while back, wanted to post the results here and get some feedback. Car idles (~900RPM) and drives around town great. Advance is set to about 21 degrees at WOT, can't remember AFR.
Car has awesome midrange torque. I'll thank the VVT and tuning for that.
Specs:
6.2L L92 Longblock
Stock LS3 Camaro Intake & TB
CAI w/ LS7 MAF TSP VVT3 Cam 23X Duration 62X Lift Dual PRC Valvesprings & Hardened pushrods
L9H E85 injectors
1-3/4 Long Tube Headers
2.5" Exhaust
No cats
No X/H Pipe
Flowmaster Dual Chamber Mufflers
T56 & Ford 9 inch
Numbers: 400whp @ 6000RPM 382lb-ft @4750RPM
Excel version
Numbers seem low but I'm no expert. Still plenty of fun. I'm going to a dyno day soon so we'll see what it puts down there.
I don't get caught up in dyno numbers, but this is about 100hp lower than what I was expecting. The shape of the curve is great, as can be expected with vvt, but 400hp seems low. It's just a number, but I was expecting a higher number than that, nonetheless.
True, but if it's that far off I'd start to think something was up with the engine and/or tune.
OP, are you sure you have an aftermarket cam installed in there? Those are just about bolt-on numbers for most LS3s.
Unless I pulled the wrong one off the shelf it most definitely is. Pretty big cam to be making 400whp too.
But yes, those are the mods. The engine is out of a 2009 Yukon Denali with 50,000 on the clock. What could be wrong at that point? No leakdown or compression tests have been done, that's what I was planning to try after checking the tune.
The graph doesn't look held back, or drop off, just looks like all the values are lower than what I expected.
If I had to point a finger at something as a culprit for your low numbers, I would say the 1-3/4" headers and the lack of a functional scavenge pipe (X/H pipe), are possibly hindering power production.
But I don't see any clear indication of this on your dyno graph.
Would like to see it on a dynojet for reference. Vvt3 and vvt4 cams make well past 460rwhp all the time on l99 cars. We need to check a few thing on your setup and get some hp out of her!!
1 3/4th headers and 2.5inch exhaust is holding a lot of power back. Upgrade to 1 7/8th and 3inch exhaust, you'll see at least 30rwhp gain. Which is still a little low for a cammed 6.2.
Did they actually tune the VVT tables at all from stock? This is exactly the reason why I don't like camming VVT car's anymore. Alot of times the tuner shops wont spend the 4-6 hours required to come up with new VVT tables for larger cams, and you wind up with a poorly profiled VVT table for your cam. While you may have gained a significant amount of power, you have to ask yourself now, is my VVT optimized to make the most power out of the cam I am using.
The graph doesn't look held back, or drop off, just looks like all the values are lower than what I expected.
If I had to point a finger at something as a culprit for your low numbers, I would say the 1-3/4" headers and the lack of a functional scavenge pipe (X/H pipe), are possibly hindering power production.
But I don't see any clear indication of this on your dyno graph.
Originally Posted by NateLS1Mustang
1 3/4th headers and 2.5inch exhaust is holding a lot of power back. Upgrade to 1 7/8th and 3inch exhaust, you'll see at least 30rwhp gain. Which is still a little low for a cammed 6.2.
I have similar thoughts. I'd expect the exhaust to hold it back at the top end a bit, but not like 50whp across the board. If something was seriously wrong with the engine then I'd expect a dip or something crazy in the dyno graph.
Originally Posted by kinglt-1
is 21degrees timing a little low or am I missing something?
Originally Posted by gtotoocool1
just saw that.
i thought the L92 heads like a little more timing than LS1s?
Originally Posted by redbird555
No ls3 heads like less timing typically 23-26 degrees at wot. But ya those numbers are very low. My ls3 with bolt ons made 50whp more. Something's up
Yes, I'm planning on popping open the tune and checking around for anything amiss. Currently having some VIN troubles but that'll get sorted out soon enough.
Originally Posted by spawne32
Did they actually tune the VVT tables at all from stock? This is exactly the reason why I don't like camming VVT car's anymore. Alot of times the tuner shops wont spend the 4-6 hours required to come up with new VVT tables for larger cams, and you wind up with a poorly profiled VVT table for your cam. While you may have gained a significant amount of power, you have to ask yourself now, is my VVT optimized to make the most power out of the cam I am using.
VVT tables are given by TSP for the cam and the phase limiter was installed. My tuner input them so that shouldn't be the problem.
IMO 21 degrees is low. Unless it is knock prone or even just over active knock sensors. Like stated above I would expect more like 24-26 and 12.3-12.5 af ratio. Just my personal experience.
10-05-2015, 11:10 AM
Headers & Cammed L92 w/ VVT Dyno Results 
