Hello guys.

I have an 05 ls2 non z51 6 speed.

I added Hinson 1 7/8 long tube headers with x pipe(no cat), Corsa/volant cold air intake(the one with a huge housing and scoop in the bumper), and radically ported ls2 intake mani from peakspeed. And intake mani was installed right before the tune.

Performance specialties in Glen Burnie, MD has a great reputations with LS engines so I gave it a shot. I know every car is different, and every dyno is different, but I feel like I got a pretty low number.

I'm about to do oil catch can and 160 t-stat next week, but I'm not sure if that's gonna do anything at all. Tuner told me along the lines of "Your car is not really taking the timing, I suspect most likely due to pcv pulling oil. " So he suggested me an oil catch can. He said once it's installed, he will take the car to the street to see if my car takes some timing and if it does he will dyno again.

That's pretty much what I got. I know peak number isn't everything, but it seems very low. I checked the compression when I bought the car and I had it for 1500 miles and I didn't drive hard. I put 93 octane gas always from top tier gas station. Any suggestions, comments or concerns? I greatly appreciate your time.

-max

 

my stock #'s on a dyno-jet were 347 rwhp 345 tq, after Roller rockers, full Z06 exhaust, K&N intake, PP throttle body, baby cam, 391 rwhp 389 tq, my tuner also said he couldn't pull anymore timing then he did. said maybe it was carbon deposits on the pistons, looked inside with a bore scope, they were clean, did find a plug wire that wasn't securely on the plug.

 

those numbers are right where they should be with your mods.the 1 7/8 headers may cause a little torque loss

 

Disagree. With headers, a honker CAI, and the exact same Peak ported manifold my A6 LS2 put up 385/395. His numbers are in the stock M6 LS2 ballpark. Something isn't right or it's a stingy dyno. Is the lower line before mods?

 

No the lower line is the base dyno with all the mods already.

Yeah, friend of mine with similar mods putting down close to 395 if I remember correctly. And I see bunch of dyno videos and sheets online with similar mods putting down a lot higher than mine.

I'm not gonna lie, it does accelerate smoother, but peak number just isn't there. Anyone has any suggestions?

Thanks again in advance.

-Max

 

I would think that with those mods, you should at least be in the 370 range.

 

I thought so too.

-max

 

Do you know what your stock/before numbers were?

 

Unfortunately I don't have the stock dyno.

I'm also wondering since new manifold was installed right before the dyno, I'm wondering if pcv oil pull was even an issue? I thought that was for like intake mani oil build up. NO?

Any more suggestions? Thanks

-Max

 

M6 ls2 should be base line 350RWHP/350RWT oem stock (411HP/411T at the crank).
Tuning alone on the stock motor should yield in the 362rwhp/362rwt range.

The headers should have added about 25hp, and the ported intake another 10hp over the base numbers. The Cold air intake saves you power, does not add it, so when the car is on the dyno with the hood open and fan blowing into the engine bay, your not going to see any HP lose from hot air going into intake instead.

The fact that is blowing oil into the system and why it pulling timing due to the knock sensor, makes me wonder if you have other problems, such leaking valve seals or the motor/piston rings too worn instead.

Have you done a compression test on the motor, and where the valve seals check/replaced if needed. Spark plugs, what did the look like, since if they are sooty as hell, you got a oil leak problem into the cylinders that needs to be resolve now.

Also, what was the base line dyno pull before you started adding mods???

As for the catch can, it will save from a touch of oil from making it to the cylinders at full tilt, but the OEM system already has baffles on both the valve covers and valley cover, so it should not be dumping oil into the intake manifold to the point that is causing the motor to pull major timing isntead.

 

Yeah I did the compression right before the purchase and I don't remember the number but they were very even across the board. Spark plug wires are new and spark plugs were fine I believe. (Honestly I don't remember paying too much attention to spark plugs) I can pull them out next week and check.

I'm baffled by the numbers too. My tuner told me that a lot of cars been making 30 to 60 whp less than some other dynos. So..., I'm gonna take it to track and see if my time and trap speed is good. Besides the oil catch can, checking the spark plugs and maybe a t-stat, I'm gonna wait it out til I run the car at the track.

Any more suggestions will be appreciated. Thanks to everyone that is giving me any suggestions.

-Max

 

i have 2005 z51-LS2 with long tube headers with x pipe(no cat)
my car make 338 hp

is this normal ??

 

[QUOTE=irok;1593907148]those numbers are right where they should be with your mods.the 1 7/8 headers may cause a little torque loss[/QUOTE]

 

Auto or M6?

The auto has more drive line lose, and could explain your lower numbers.

Hence stock, the M6 makes 350rwhp/350rwt, while the auto with higher drive line lose ends up around 335rwhp/335rwt instead.


Also, need to see the graph for the pull to verify that we are talking ASA number, or if actual output for your altitude instead.
Read the ASA number compensates for the altitude lose if you are not at sea level, and give the HP number if the car was running at sea level instead.

 

well my LS3 auto pulled only 368HP on a mustang dyno .
(1 3/4 kooks new air take Lingenfelter tune ) I feel your pain.

 

My 07 A6 Z51 car has Vararam, TSP long tubes with no cat/x-pipe. Dyno'd 370/373 after mods/tune.

 

Remember that every dyno is different. Your numbers are fine.

 

Give us a call if you want it straitened out. Was the AFR sensor placed in the tailpipe? If so your very rich(too much fuel at WOT). If a wideband was put in the headers for the run you are still even rich going by your printout.

We will baseline it and if all is well it will be $75. If we tune it then you are looking at $400. We have our Dynojet 224 on site.

 

If you want us to take a look at it and give you our opinion on it give us a shout or stop by the shop. You will feel right at home when you walk in with the amount of C6/C7 we have in the shop.

 

RPM and HPA,

I may consider doing that I appreciate your input and interest.
Any opinion on where my HP should be? If nothing is wrong with my car?

-Max