Hey guys,
I am in need of some serious help here. I just did a bunch or work to my 99 camaro and it seems to have some pretty chitty performance.
This car has seem to have had problems for some time prior to the heads and cam swap this car ran a best of 13.20 (m6) at 105 mph with macs.
Now the car has
Patriot performance ls6 stage two heads
comp cam with 230/227 .592/571 112+4
mac mid mids with off road y pipe
slp lid
ls6 intake
Stock Throttle body
stock injectors
stock rockers
ram clutch
moser 12 bolt with 4.10 gears
spohn arm and lower control arms
slp oil pump
Nitto's
msd plug wires and ngk plugs
Flowmaster muffler inplace of the stock unit

I took the car to the track last night and ran it several times With a best of 12.62 at 110mph with a 1.88 60, Shifting at 6500 This seems like a stock cars mph and times can anyone help me with any suggestiong as to why this unit performs so poorly.
The car was dyno tunned right after the heads and cam swap, but it did not have the clutch, ls6 intake and was running through a stock rear muffler.
It only put down 363.8hp and 356.6 torque While this was low I figured It might wake up with the new exhaust and intake.
I am really boggled as to why this unit runs so poorly and has such a low mph. The car has a very noticable tick noise after warm up and sounds like a sewing maching. Guys any insight would be great and thanks again for reading this.
Elec

 

when I did my first cam install on an LS1, the rockers werent tightended properly, and we had a very noticable lifter tick. well, take off the valve covers and tighten them down in sequence layed out in gm manual and no more noise. I wonder if this is goin on w/your car, and its picking it up as knock and retarding the timing?
good luck
chris

 

You shaved .6 and gained 5 mph, thats not that bad, did you get any programming done? i also heard especially with cammed ls1's longtubes make a hell of a difference verse the mid length, and i have never seen a stock ls1 run 12.6 let alone 110 mph stock.

 

yeah... sounds like you're not doing TOO bad... I'd say get a computer tune. A ported throttle body or aftermarket throttle body and a larger MAF will make some difference here, since you have the right parts to make use of it. Long tubes will make some difference here also. Ditch the flowmaster, get a cat-back exhaust system, or at least a cut-out. just FYI I'd say stock fbodies are averaging 13.20-13.50 @ 106-108--- you are much faster than this. Some go faster, some go slower, but like I said, that's probably average. Also, we know nothing about your track-- altitude, etc. higher altitude is going to take its toll on your MPH and ET. The DR's are also keeping your MPH lower. on street tires you'd probably be looking at 112-115 mph range, but a slower ET. I've heard bad things, and good things about patriot heads, also... But they are sort of an "economy" head port, so keep that in mind too. Not saying they're a bad product, but they're not always top tier either.

 

Heck I run 118-120 with stage I LS1 heads thru an A4 with slicks on.
I think that Chris might be on the right track. What length pushrods did you use and are you within the specs for preload with the lifters? Maybe your valves aren't closing all the way? Or aren't opening all the way?

 

I had a shop who specilizes in this kind of work select the parts, cam and do the install. It did get new pushrods at the time and they tuned the car when it was there. I don't think it was a installer error I think I have somthing holding me back I just can't see.
I have seen a guy I knows car run 12.77 on a ls1 with longtubes, drag radials and slp dual dual exhaust.
The track I run at is cordova, We are smack dab in the middle of the midwest.
Thanks for the input guys keep it comming I will look over the things you have suggested.
Elec

 

I think you def. have some type of problem. That cam alone should put you over 400 rwhp, my F11 (228/230 .581/.591 112) did. Although you do have a 12 bolt and 4.10's, you should only be losing 15-10 rwhp max through it. What lifters are you using and what is the preload? ALSO, are you sure you have adequate piston to valve clearance on that motor? We mocked up my roomates motor with those same exact heads and a Futral F13 (230/232) and it was way to close for comfort. Just something you oughtta think about.

 

Sell the H/C setup and get a blower

 

The whole swap was done by a shop in the area that specializes in these things, I do have stock lifters in the engine still. But they swapped pushrods and setup the clearances when they assembled the car.
Elec

 

hey elec, check your for sale ads...

 

hell my bone stock 2001 camaro ss with a 6 speed ran 12.79 @ 111mph with a 2.01 60' and all i have is a lid
Thanks Jason

 

sorry i think thats you running 12.7 @ 111 with just a lid, was it 5 degrees out? is the track seal level? at the track i go to its 1200 above sea level and ive seen atleast 50 ls1's and the fastest fairly stock was 13.3 @106 with 6 speed, and im sure some of these guys know how to shift also. no way your over half a second faster.

 

Well, I have to admit that I saw a stock 02 M6 run a 13.07 at NPR. Stock down to the paper filter. Now as far as what a lid can do for you, im not sure.

 

Well I took the car out tonight hooked up to a scan tool. I was watching the timing and noticed under wot it ranged from 19-25 degrees and at cruise as much as 40. Does this timing seem correct? Also there was not knock retard or knock present the whole trip. I thought 32-36 was the norm?
any input would be great thanks
Elec

 

lol I also have to wonder how he picked up MORE than 100hp and 150lb/ft of torque with a 100 shot. 332 rwhp bone stock? that's close to ls-6 range. gotta say that one's tough to believe.