Dynamometer Results & Comparisons - 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!

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1st dyno with full intake and full exhaust.

http://i195.photobucket.com/albums/z229/CodyAlanB5/Scan_Pic0029.jpg

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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.

http://i195.photobucket.com/albums/z229/CodyAlanB5/Scan_Pic0030.jpg

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.

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.

I agree, LS6 intake and TB.

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.

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 ;)

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

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

My idle Rpm's is around 900 to 1000, actually I need to look at that again, LOL.

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!

Looks like my 99 SS is getting this setup! Any videos?

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.

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.

lmfao @ donkey Dick cam lol

I believe the horsepower but not the torque. Should run hard nonetheless.

Here's a very similar combo.. http://ls1tech.com/forums/dynamometer-results-comparisons/1571835-lashway-build-complete.html#post16588089

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

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..

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...

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

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.

Great before and after numbers! Really gets me excited because this is the same setup I have been looking at for a long time now. It would be even cooler if you could get some track times with it!

great numbers ! I have some new found respect for the 228r cam.I always though it was too mellow to produce such great numbers.

Anyone have an idea of how this cam would perform on a set of stock 243's. I'm about to pick up a set to replace my 853's.

Here's a very similar combo.. http://ls1tech.com/forums/dynamometer-results-comparisons/1571835-lashway-build-complete.html#post16588089

I started to link back to my post as well.

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.

http://ls1tech.com/forums/generation-iii-internal-engine/1535296-my-winter-mamo-build-mostly-done-3.html

Your numbers are substantially higher than a full mamofied setup with 102 fast. Not hating on you but i do have a healthy skepticism of this. I assume you have a 6 speed?

http://ls1tech.com/forums/generation-iii-internal-engine/1535296-my-winter-mamo-build-mostly-done-3.html

Your numbers are substantially higher than a full mamofied setup with 102 fast. Not hating on you but i do have a healthy skepticism of this. I assume you have a 6 speed?

Just shows you, that you dont need to spend $3000 on heads to have a mean and stout setup that isnt complicated.

http://ls1tech.com/forums/generation-iii-internal-engine/1535296-my-winter-mamo-build-mostly-done-3.html

Your numbers are substantially higher than a full mamofied setup with 102 fast. Not hating on you but i do have a healthy skepticism of this. I assume you have a 6 speed?

Yes I have a 6-speed. I am not that much concerned about this dyno versus that dyno as much as I am my before and after numbers on the same dyno. I made a comment that clearly this thing takes off like a scalded dog around 4,000-4,500 and clearly it shows on the dyno that the torque picked up is substaintial. You can definitely feel it. It pulls like it never did before.

It squeels tires 1st to 2nd, 2nd to 3rd.

To be honest with all of you, I would not go past the 228R with 112 LSA. .588 lift on I and E is as far as you would wanna go for a daily driver. Even with a good tune, you will experience a bit a surge from 1000-1800 rpms and where I was getting 28-30 mpg before on the highway. It gets more like 22-24 now.

Now with this said, most people don't buy corvettes for gas mileage and most people, including myself, didn't buy one for a daily driver. It still retains very good street manners. Not to mention I used racetronix 440CC injectors, some people say the Bosch injectors have a better idle and a much better spray pattern.

Perhaps a set of Bosch Injectors are more suitable for the daily driver? Would anybody clarify the difference in racetronix and bosch and if one is much better than the other?

Get it to the track that trap speed will either solidify the dyno numbers or discredit them. Dyno numbers shouldn't be taken so seriously, its only a tool for tuning.

I'll head down to Steele next weekend and see what I can do on the 1/4.

In the meantime I cleaned up the dyno sheet so people can really see the marks.

Had to basically overlay the original 370 horsepower bolt on dyno with the 450 dyno with heads and cam.

Check it out!

http://i195.photobucket.com/albums/z229/CodyAlanB5/CorvetteRealResults.jpg

People say the 440 torque is bogus, maybe it is, but on my drive home I made mention that 4000 mark it has a "hit" that is literally comparable to a Honda S2000 when it engages the higher lift cam lobe around 6000 rpms... instant 30 ft-lbs of torque in that car, lol.

Of course our power gains are obviously much stronger, lol.

Where are you shifting the car with the new h/c?

Peak horsepower is around 6150 so I shift at 6200 rpms.

Basically it's pointless to go past that, plus shifting around 6200 puts you right in the meat of the power.

Love this car man, it's funny when you run a kid like I did today that people talk about is fast. (white 350z) only to pull him over ten cars, lol.

Peak horsepower is around 6150 so I shift at 6200 rpms.

Basically it's pointless to go past that, plus shifting around 6200 puts you right in the meat of the power.

Actually that's not right at all. You're leaving ALOT on the table shifting that early. I shift my stock internal bolt-on car at 6200 rpm. A rule of thumb is shifting 500rpm past the point where you make peak hp. That's what a stock ls1 peaks at about 5700 and they shift at 6200. I'd bet you are leaving ateast 2 tenths on the table shifting that early

Hmm, i'll have to keep that in mind. Redline is set at 6700...

Need some double clutch action lol...

I can't remember if you said you're auto or 6-speed, but shift extension is also a big part in why you need to shift the car so many rpm over where it makes peak hp. That way when you shift it will come back down into higher rpm (you powerband).

Great numbers. People will hate.

Yep, I got out to see what it would do...

Let off at 170 mph, it was still pulling.

And, my car is a 6-speed.

Glad to see another happy 228R owner, looking forward to some track times.

Excellent numbers from a proven setup! There will always be haters, but as long as you are happy thats all the matters. I will be curious to see track times as well.

I am anxious to see track times as well. This is the setup I would like to run.

How is the streetability?

There is no way that heads cam setup should peak that low at 6150...that's LS6 cam territory. That dyno has been adjusted to give "happy" numbers...
The fact that you gained 80rwhp from the addons is pretty good! That's a nice jump in power. There is no way with your setup that you are legitimately making 443 lbft of torque on 346ci...but its still a stout car.
I ain't hating...you made excellent improvements...just that particular shop is not putti.g out legitimate dyno numbers.

I believe the horsepower but not the torque. Should run hard nonetheless.

ditto

ditto

X2...those dyno's are known for producing inflated torque numbers.

In for track results. Impressive numbers, but I really doubt youre gonna trap 120mph+ like you should with 450rwhp.

For reference, my 6.0l/LS3 heads milled&ported 11:1 CR/230-236 cam/TSP 1 7/8 and new ORY is around 450rwhp. Any dyno higher than that, I would say its inflated. My last 5.7l build was trapping 117mph with 404rwhp on a mustang dyno(ported FAST 92/stage 3 98 heads/3:42/every bolt ons, heavy rims 2.2sec 0-60). I can feel the car is way faster, 40-50rwhp butt dyno. Tuner said should be 530bhp.

Not hating, you have a very nice setup. Enjoy and tell us how it goes at the track. 228R is a really nice cam for sure!!

Anyone have an idea of how this cam would perform on a set of stock 243's. I'm about to pick up a set to replace my 853's.

IMO just over 400wheel if you have ls6 intake to match

I have the same set up with a fast 90 and make 450 409 it's so fun