MY 2002 CORVETTE (PRC LS6 Heads and 228R Cam) DYNO TUNE! 450 RWHP!
08-03-2012, 07:07 PM
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MY 2002 CORVETTE (PRC LS6 Heads and 228R Cam) DYNO TUNE! 450 RWHP! Well the moment we have all been waiting for! My 2002 Corvette with full exhaust and intake.
It previously dyno'ed a respectable number of 369 horsepower and 375 ft-lbs of torque. Respectable, but mistaken
Now with the PRC Stage 2.5 heads, decked for 11:5-1 compression and 228R 112 LSA camshaft the results were remarkable.
450 rear wheel horsepower! 444 ft-lbs of torque! How this car pulls....
The dyno sheet is below. Omit the green one, I think layne culver may have overlapped the wrong dyno...I don't know.
The Red is all mine though!
-------------------------------------------------------------------------
1st dyno with full intake and full exhaust.
-------------------------------------------------------------------------
2nd dyno with PRC Stage 2.5 LS6 heads, 228R Camshaft with 112 LSA.
Decked for 11:5-1 compression.
Comp rocker arm trunion upgrade.
LS7 lifters.
LS2 lifter trays.
LS2 timing chain.
Mellings high volume oil pump.
Redline raised to 6700 rpms.
It previously dyno'ed a respectable number of 369 horsepower and 375 ft-lbs of torque. Respectable, but mistaken
Now with the PRC Stage 2.5 heads, decked for 11:5-1 compression and 228R 112 LSA camshaft the results were remarkable.
450 rear wheel horsepower! 444 ft-lbs of torque! How this car pulls....
The dyno sheet is below. Omit the green one, I think layne culver may have overlapped the wrong dyno...I don't know.
The Red is all mine though!
-------------------------------------------------------------------------
1st dyno with full intake and full exhaust.
-------------------------------------------------------------------------
2nd dyno with PRC Stage 2.5 LS6 heads, 228R Camshaft with 112 LSA.
Decked for 11:5-1 compression.
Comp rocker arm trunion upgrade.
LS7 lifters.
LS2 lifter trays.
LS2 timing chain.
Mellings high volume oil pump.
Redline raised to 6700 rpms.
08-03-2012, 07:20 PM
#2
I like those numbers since I have the same combo....But I don't believe dyno numbers...So many variables and some dynos rate high. I think 450/444 is too much power for that combo. Do you have a FAST 92/92 as well?
Take it to the track and get a trap speed.
Take it to the track and get a trap speed.
08-03-2012, 07:31 PM
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The same dyno gave me 370 horsepower, the same dyno after mods gave me 450.
So by percentage. It made more peak power by 17 percent.
80 more horsepower out of heads and cam. Not bad!
How does it feel? About the same, until you hit 4000, then it hits you and instead of power dropping off after 5,500 this engine just keeps...on...going... All the way to 6,700 hard cut!
God forbid can I say it feels like VTEC from 4,000-6,500 rpms. It is pretty damn awesome how quick it gets to 60 from a stand still.
08-03-2012, 07:32 PM
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And true, I say just use the same dyno. It's just a reference device.
So if my car made 340 on a mustang dyno and 420 after heads and cam on a mustang dyno, then I guess its still 80 horsepower, whatever that unit may mean
So if my car made 340 on a mustang dyno and 420 after heads and cam on a mustang dyno, then I guess its still 80 horsepower, whatever that unit may mean
08-03-2012, 08:18 PM
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Cody,
Those are some stout numbers!!! Good Job dude...
You remarked that it felt the same until 4K rpm. My old C5 w/ TSP H/C 228R & PRC STG 2.5 5.3's always felt like it needed 3.90 or 4.11 gears to make it feel complete. But, job transfers, kids...blah, blah , blah...
How does your valve train sound?
Any cam surge?
What's your idle RPM (mine was 900-ish)
Cowpunk
Those are some stout numbers!!! Good Job dude...
You remarked that it felt the same until 4K rpm. My old C5 w/ TSP H/C 228R & PRC STG 2.5 5.3's always felt like it needed 3.90 or 4.11 gears to make it feel complete. But, job transfers, kids...blah, blah , blah...
How does your valve train sound?
Any cam surge?
What's your idle RPM (mine was 900-ish)
Cowpunk
08-03-2012, 08:32 PM
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Cody,
Those are some stout numbers!!! Good Job dude...
You remarked that it felt the same until 4K rpm. My old C5 w/ TSP H/C 228R & PRC STG 2.5 5.3's always felt like it needed 3.90 or 4.11 gears to make it feel complete. But, job transfers, kids...blah, blah , blah...
How does your valve train sound?
Any cam surge?
What's your idle RPM (mine was 900-ish)
Cowpunk
Those are some stout numbers!!! Good Job dude...
You remarked that it felt the same until 4K rpm. My old C5 w/ TSP H/C 228R & PRC STG 2.5 5.3's always felt like it needed 3.90 or 4.11 gears to make it feel complete. But, job transfers, kids...blah, blah , blah...
How does your valve train sound?
Any cam surge?
What's your idle RPM (mine was 900-ish)
Cowpunk
Cam surge, define? (Is it like surging or hopping at near idle slow speeds?)
The valvetrain, in all honesty is very quiet, probably more quiet than it was before. .080 preload on LS7 lifters seems to the job very very very well!
My tuner anticipated power around 420-430, but 450 was alot, this could be because of the raised compression. From 10:5-1 to 11:5-1.
It definitely improves torque and horsepower through the powerband and the engine is made more responsive by the raised compression.
Anybody who plans to do this, do not cheap out. Upgrade oil pump, lifters, lifter trays, timing chain, rocker trunions, new torque to yield head and crankshaft bolts, and use GM multilayer steel head and exhaust manifold gaskets.
You will probably thank yourself later on when you never have to open the engine again, as many have due to split lifter trays or worse.
I love it. I really do!
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08-04-2012, 09:53 AM
#8
All that matters is that you're happy with the results and the way the car drives. I love seeing people going with smaller cams and still making great numbers. Plus, you have what is called "ueseable power" and great low end torque that people who go with donkey dick cams don't.
08-04-2012, 10:07 AM
#9
All that matters is that you're happy with the results and the way the car drives. I love seeing people going with smaller cams and still making great numbers. Plus, you have what is called "ueseable power" and great low end torque that people who go with donkey dick cams don't.
08-04-2012, 10:51 AM
#12
Will you get it to a drag strip? I know that isn't always possible for some folks. But it is a better way to measure real world power from the mph the car runs.
My C5 hasn't seen a dyno, I'm tuning it myself and ran 122 last evening. It's an A4 car. I have no idea what HP that is, but it's probably not 450 at the wheels.....
These were my first good runs, I believe there will be a little more with tuning and better weather conditions.
Ron
My C5 hasn't seen a dyno, I'm tuning it myself and ran 122 last evening. It's an A4 car. I have no idea what HP that is, but it's probably not 450 at the wheels.....
These were my first good runs, I believe there will be a little more with tuning and better weather conditions.
Ron
08-04-2012, 11:23 AM
#13
Cody,
Congrats!! Those numbers are great. What i love about your setup is that it is a simple setup, an off the shelf cam. You didnt spend $3000 in heads, or "Custom Spec" a magical cam that is supposed to do everything..
This is a simple combo.. Im sure the haters will say well dynos arent everything, and TSP/PRC heads arent top echelon heads that should be making that kind of power..lol
Great job.. I bet you didnt have a headache with that simple and yet effective combo..
Congrats!! Those numbers are great. What i love about your setup is that it is a simple setup, an off the shelf cam. You didnt spend $3000 in heads, or "Custom Spec" a magical cam that is supposed to do everything..
This is a simple combo.. Im sure the haters will say well dynos arent everything, and TSP/PRC heads arent top echelon heads that should be making that kind of power..lol
Great job.. I bet you didnt have a headache with that simple and yet effective combo..
08-04-2012, 12:55 PM
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Yep, this was a fun undertaking...
From a young guy that got his start with the venerable roadster, the Mazda Miata.
I learned what I know working on those cars and applying it to the corvette was just a matter of changing the form a bit...
It feels good to see gains like this knowing you didn't have to go forced induction...
From a young guy that got his start with the venerable roadster, the Mazda Miata.
I learned what I know working on those cars and applying it to the corvette was just a matter of changing the form a bit...
It feels good to see gains like this knowing you didn't have to go forced induction...
08-04-2012, 01:00 PM
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The corvette's y body platform was the closest thing I could get to the handling characteristics, balance, and feel of a lightweight roadster.
C5 platforms seem much stouter in appearance than the f body's.
It looks like a body on frame truck u know what I mean
C5 platforms seem much stouter in appearance than the f body's.
It looks like a body on frame truck u know what I mean
08-04-2012, 01:07 PM
#16
The C5 is amazingly stiff too. Jack the front up at the jack point and the rear nearly comes off the ground.
I wanted to learn the LS engines, and EFI. The Vette is quite a nice wrapper.
And guys, they aren't all that expensive. I piad $10k for mine with 78k on the clock last summer. All the parts in my .sig were bought used save for the cam and timing chain. Although the EPS cam isn't off the shelf, it was $20 more than the Comp.
I wanted to learn the LS engines, and EFI. The Vette is quite a nice wrapper.
And guys, they aren't all that expensive. I piad $10k for mine with 78k on the clock last summer. All the parts in my .sig were bought used save for the cam and timing chain. Although the EPS cam isn't off the shelf, it was $20 more than the Comp.
08-05-2012, 07:15 AM
#20
Here's a very similar combo.. https://ls1tech.com/forums/dynamomet...l#post16588089
same heads 11:1 compression, same cam but a 114LSA with a +2 timing.
They did the LS7 lifters and LS2 trays with 7.375 pushrods and the comp upgraded trunions. the engine is quieter now than it was stock.
440/380 final numbers.