The LS1 swap has begun
10-15-2010, 03:05 AM
#391
Rennlist Junkie Forever
It's a '02 LS1 SS motor with the LS6 intake manifold and throttle body. It has whatever heads came stock on the '02 SS motor, 241's I think.
Dual 2.5" exhaust with cats leading into a dual inlet/outlet magnaflow exhaust. Straight shot intake like yours. Shorty headers, not sure of the primary sizes.
Thunder Racing 224 cam, .563/.563 with 112 or 114 lobe seperation. They have a dyno on their website showing 398rwhp with this cam and very similar supporting mods with the exception that they were running long tube headers...
Dynojet dyno, probably a 248C.
I agree that something is off, I'm not sure what. The builder is very competent and swears the car is running extremely well and the motor has good compression.
Do you think the cam is mis timed? That's really the only thing I can think of that would cause a 50-60rwhp difference.
Dual 2.5" exhaust with cats leading into a dual inlet/outlet magnaflow exhaust. Straight shot intake like yours. Shorty headers, not sure of the primary sizes.
Thunder Racing 224 cam, .563/.563 with 112 or 114 lobe seperation. They have a dyno on their website showing 398rwhp with this cam and very similar supporting mods with the exception that they were running long tube headers...
Dynojet dyno, probably a 248C.
I agree that something is off, I'm not sure what. The builder is very competent and swears the car is running extremely well and the motor has good compression.
Do you think the cam is mis timed? That's really the only thing I can think of that would cause a 50-60rwhp difference.
I'd be interested to see the ECU mapping. I see that you're not running a MAF, so it must be mapped alpha n.
Assuming the engine has good leak-down on all cylinders, it's either a fueling, ignition timing, and/or cam timing issue.
No matter, 348RWHP is way low for that engine.
Can you check the intake manifold to see if it's a LS1 or LS6? That will make a good 15RWHP difference. The LS1's have a "V" on the bottom. The LS6's are flat.
Did you install the "H" pipe in the exhaust?
Plus.... the cats will cost you some power for sure. Maybe 10-15RWHP depending on the design.
TonyG
10-15-2010, 11:53 AM
#392
Rennlist Member
Thread Starter
I am running the stock MAF, header primaries are 1 3/4. Cam is actually a Comp Cam, specs are:
part number TR224-14
cam specs int exh
adv dur 274 274
dur@.50 224 224
lobe sep: 114.0
Valve lift: .564 .564
Have to get under the car but I'm pretty sure there's an "X" in it, I'll check to see if it has the LS6 intake, it should as it was an "SS" motor.
Yeah, I figured with the cats I'd put down somewhere near 375rwhp or so.
part number TR224-14
cam specs int exh
adv dur 274 274
dur@.50 224 224
lobe sep: 114.0
Valve lift: .564 .564
Have to get under the car but I'm pretty sure there's an "X" in it, I'll check to see if it has the LS6 intake, it should as it was an "SS" motor.
Yeah, I figured with the cats I'd put down somewhere near 375rwhp or so.
10-15-2010, 12:12 PM
#395
Addict
Rennlist Member
Rennlist Member
ask Eric also to bypass the coolant lines to your throttle body. There are "free HP" mods for the LS1 that I implemented on my truck of which some can help your SS motor.
10-15-2010, 12:24 PM
#397
Burning Brakes
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I wouldn't worry about it, it'll get sorted out once you get it. Old gas, maybe you've got a plugged injector, the plugs got fouled during tuning, who knows. The hard part is done, the rest is just piddly stuff.
High-flow cats will cost you only a few horsepower (i've seen the dynos)
High-flow cats will cost you only a few horsepower (i've seen the dynos)
10-15-2010, 12:29 PM
#398
Rennlist Member
Thread Starter
Yep, car is in my garage now. I also need to look into the AEM wide band gauge, it's only reading 14.8 constantly, so something there isn't hooked up right.
That's my experience with cats too, they maybe take away 5hp or so.
That's my experience with cats too, they maybe take away 5hp or so.
10-15-2010, 01:46 PM
#400
Rennlist Junkie Forever
The only part of the emissions crap that will suck up any significant power are the cats.
The MAF is ok, although I have a larger aftermarket throttle body.
We need to see the dyno with the a/f ratio plotted.
The intake will make a big difference so that needs to be checked.
I'd be real interested to see how they mapped out the ECU.
TonyG
The MAF is ok, although I have a larger aftermarket throttle body.
We need to see the dyno with the a/f ratio plotted.
The intake will make a big difference so that needs to be checked.
I'd be real interested to see how they mapped out the ECU.
TonyG
10-15-2010, 03:26 PM
#403
Addict
Rennlist Member
Rennlist Member
I think Tony is right you still have a couple of points of restriction: cats, stock throttle body, and the heads. Your cam is not able to increase the intake flow to potential till the heads gets a mild port and you open up the TB
10-15-2010, 04:44 PM
#404
Team Owner
Wish I had noticed this thread earlier. Saw your car and should have taken some pictures. Guys had it out at Zimm's swap meet last weekend in Euless (Texas). Amazing how many people walked right by with the hood up and didn't even notice. It was that clean an install job. Visited quite a bit with Eric and Kent. Sharp nice no BS guys. Intend to take them up on the offer to visit their place in Alvarado and see Kent's black 951/Ls1. Make some nice after market parts by the way.
