Dynamometer Results & Comparisons - First Time to the Dyno...I think I have a Factory Freak...

I bought my 2002 Z28 from it's original owner in October of 2011 with 150,000 miles on the clock. When I bought it, the car had a lid, LM, and FTRA. I gutted the cats, added a DMH cutout and installed a Flowmaster 80 series (I know, it sucks, but it was free and my ears were ringing from the LM!). I also had Lew from DiabLew Tune make a custom tune. Motor was otherwise unopened, with not so much as the valve covers being off it.

Took the car to Jim at CalSpeed and Performance in Bakserfield, CA where he put it on his DynoJet:

http://i1004.photobucket.com/albums/af165/vanshmack/Camaro02-CalSpeed-Dyno.jpg

First run, the motor was way lean. Jim reworked the tune, which delivered the 378 RWHP/423 RWTQ figure through the open cutout.

The car was always fast (and I've owned 2 previous LS1 F-bodys, so I know), but the extra fuel turned the car into an animal.

One little disclaimer is that Jim @ CalSpeed said his dyno reads 10-15 HP higher than other Dynojets, so the real number is probably closer to 360-365 RWHP. Still, it picked up 40 RWHP with more fuel.

Jim seemed to think that the original owner may have installed in a baby cam or had the heads mildly done. I checked with him last night, and he confirmed what he had already told me when I bought the car: The motor is untouched.

Has anyone seen dyno figures this high from a mostly stock car?

that torque is unreal.....


if my memory serves me correct,my 2000 m6 with full bolt ons was in the 370rwhp range but the torque was 330?

^^+1..

Well, that sheet isn't from a Dynojet. It says dynocom at the bottom left corner. I'm not sure how that dyno measures but, is it possible something like an erroneous RPM reading could have led to false torque calculations? The HP number is within the realm of believability (on the high side) especially given the operator said take 15 off for a total of 362.

Well, that sheet isn't from a Dynojet. It says dynocom at the bottom left corner. I'm not sure how that dyno measures but, is it possible something like an erroneous RPM reading could have led to false torque calculations? The HP number is within the realm of believability (on the high side) especially given the operator said take 15 off for a total of 362.

According to Jim @ CalSpeed, its a DynoJet 248.

Take it to the track. I bet it doesn't trap higher than 107. Just saying.

Either it has motor work or his dyno is just crazy high. A track outing can tell some.

Take it to the track. I bet it doesn't trap higher than 107. Just saying.

I've trapped 107 in an A4 car that dynod at 307 RWHP. This car is much stronger than that one.

But you are right...A trip to the track is in order.

The shop that did the dyno specializes in LS motors and he's a sponsor here. He said the high that he's seen on THIS SAME DYNO for a stock motor is in the 330 range.

He's convinced it has head work or a baby cam.

Oh...Forgot to mention that injectors were at 90% duty cycle, and Jim indicated that with my next mod, I should also do injectors.

FWIW.

I thought mine put down good numbers for no internals, but damn those are crazy. Take it to a different dyno see what happens, what was the correction factor? BC mine put down almost 400rwhp and 415rwtq before correction.

If your fuel pump is healthy and truly supplying 55+psi throughout the run and the IDC is 90% I could believe the power numbers however not on a stock LS1. The highest header cutout lid ls6 intake car I've seen IDC wise with a known good pump is just a hair over 80% duty cycle.

Both of my personal cars with your mods plus longtubes have run mid-low 12's with the auto trapping 110 and my 6spd car trapping 113, both of them had IDC in the low 80's.

If it truly is stock it's a hungrey machine for sure. I don know that I'd touch it lol. It might wipe the special sauce off of it if you do.

something seem fishy why peak hp at 5k?

I say weigh the car and then make some passes to get an idea if the HP numbers are correct or not a fluke. Does sound like it could have a sleeper or cheater cam in it. Maybe an LS6 cam and could have had a valve job / milling done on heads. I would think that could be worth 15-20 hp even on a car without headers. But, hey a stock ringer could probably dyno 310 -315 and then the mods you have done could be worth 35-40 hp which would put you close to where you are.

your no where close to those numbers.. bogus dyno.. take it to the track and I bet you trap 112 or lower which is not equivalent to those numbers

your no where close to those numbers.. bogus dyno.. take it to the track and I bet you trap 112 or lower which is not equivalent to those numbers

I agree. I can't see how numbers that high out of a stock LS1 are even possible, something is up with that dyno or the car has more work done to it than what is being said.

Check these threads out. These guy's used the same brand dyno and got rediculous torque readings also. Guarantee your not making those numbers on a legit dynojet. You need longtube headers to get 360-365rwhp, along with the rest of the bolt on's.


http://ls1tech.com/forums/forced-induction/1514062-results-stock-bottom-d1sc-numbers-today.html

http://ls1tech.com/forums/dynamometer-results-comparisons/1295486-hand-ported-853-heads-2002-tr224-cam-guess.html

According to Jim @ CalSpeed, its a DynoJet 248.

Send Jim a link to this thread and ask him if he can explain why his dynojet is producing sheets that say "dynocom industries inc" on them. Seems as if dynocom is the happiest dyno ever from reading 30th t/a's links.

Send Jim a link to this thread and ask him if he can explain why his dynojet is producing sheets that say "dynocom industries inc" on them. Seems as if dynocom is the happiest dyno ever from reading 30th t/a's links.

I got the DynoJet info off the website...I know it wasn't a Mustang (obviously!), but he has access to both, so I assumed by process of elimination it was the DynoJet.

Also, I wasn't sure if Dyno software was a choice of the operator, independent of the hardware. So these were my assumptions, and I assumed wrong.

Honestly, I had never even heard of a Dynocom dyno until now.

http://www.dynocom.net/

I can be a testimony to an 04 GTO LS1 I had with stock manifolds and exhaust put down 386 rwhp, 374rwtq. But that was a torquer v2 cam and 243 Z06 heads. So with stock exhaust and manifolds its possible but not without other mods.

Trap speeds don't lie.

Dyno's are only tuning tools. Don't take their readings to the grave.

According to Jim @ CalSpeed, its a DynoJet 248.

No sir, you were on a Dynocom eddy current loaded chassis dyno. I would disregard the torque as its picked up through the snapshot function if you dont pick it up with inductive, computer selfs calculates RPM /torque based on vehicle being held to a 2k rpm start point on the start of the run. It doesnt affect the HP numbers (as you dont even need to hook up torque/rpm reading, doesnt affect rwhp reading etc). I am waiting for a new inductive pickup for RPM pickup.

We also have a Dynojet 248 non-loaded but its being moved from old location and is not installed in our new expansion of our shop currently.

We've put several cars back to back on our dynocom vs dynojet 248. typical 300 rwhp stock LS1/fbody makes 315 rwhp on our dynocom. 400 rwhp car on our dynojet made just over 420 rwhp on our dynocom. I do much perfer the dynocom for tuning because it has such fantastic loading capability with the eddy current and the software/hardware works much better than the winpep software from dynojet.

One thing without a doubt is the tune was spot on when it left fixing the issues in the tune:
Your car was crazy lean on the first pull with the mail order tune you had plus the tune in it was pretty bad in several areas. Also injector flow rate was approx 88-90% on the pulls after correction as well as the MAF airflow showed it was making more than a stock bolt on car (which made about 39 rwhp more rwhp than the way it came in).


How did it feel when you left versus before?

Thanks again for taking the time to tune the car, Jim.

The car feels every bit of 40 HP stronger than before. It has much more throttle response, and revs much faster. Whatever the actual HP number is, it still picked up a huge amount compared to how I drove it in there.

Now I just need to figure out what I'm going to do about future mods, as I'd hate to take a step backwards!

Yeah , Dynocoms torque readings are always off. Stock K20's make 170trq here locally (that's unheard of). Id say take it to the track and post results!

Throw some Kooks or ARH 1 7/8 headers, a nice TB and drive it till it dies. Yeah, and save up for an LS3... :)

<~ NDI guy

Eddy Currents Rule! :jest:

Jim, thanks for the clairification on the dyno numbers.

I've met Jim at Cars and Coffee here in Vegas. He is a standup guy. One of our club members (Gilbert) has a tune from him and the car flat out runs.