CNB

Here is a little background information first. My car is a 2000 FRC m-6. When my car was bolt-on and manifolds only it dynoed 332rwhp and 330rwtq. I added Dynatech headers with a tune and ended up with 336rwhp and 343rwtq. Granted, I gained horsepower under the curve and 13rwtq torque but peak numbers were dissapionting. I just recently had a 3.90 rear gear installed and re-dynoed.

The result after the gear swap with the Dynatech headers was 331rwhp and 332rwtq.

I was just not happy with the results before the gears and especially after the gears. I had been trying to decide between LG headers and QTP headers and I finally decided on LG headers with Random Tech cats. The results that follow are from a header swap only. Nothing else. Lou could not touch the tune because my tuner locks his work.



Results after adding the catted LG headers only is 341rwhp and 349rwtq. Remember, this is with 3.90 gears.

If you look at the air/fuel with the Dynatech headers (red line) you will see it ranged from 12.7 to 12.8 and started to richen up around 5600 rpm. Now look at the air/fuel with the LG headers (blue line) and you will see it richened up more to the range of 12.5 to 12.6. That means that even more power and torque will be found by adjusting the air/fuel to around 12.8.

The results are obvious and I am impressed.

I'm adding a Vararam VR-2B on Monday and will get a retune. I hope to see even better results.

Power Mod list:
Vortex Rammer
Ported stock throttle body
LS6 intake
LG headers with Random Tech cats
GHL cat-back
LS1 edit tune

Other mods:
B&M Ripper shifter
3.90 gears
18" chrome ZO6 take off wheels

T_Vert

something was wrong with your original tune if you only gained 4 hp w/ the dynatechs. Being as the car was dyno;d at LG will keep many skeptical.

Dave

CNB

Nobody can argue with the gains made today. Even if it is LG's dyno the results are crystal clear. The baseline with Dynatech headers and 3.90 gears on LG's dyno was 331rwhp and 332rwtq. After adding LG headers only and still the 3.90 gears was 341rwhp and 349rwtq. Remember, Lou could not touch my tune.

'06 Quicksilver Z06

T_Vert

nope cant argue w/ someone who has a vested interest in the outcome.. Even if they dont touch a tune they can touch the dyno. And i know your HP gain w/ dynatech plain suck! I gained quite a bit w/ those headers at the track.

Dave

CNB

Well, considering I was there watching the whole time I doubt they did anything. Just to let you know, their dyno is in the ground so it would be hard to change something. I'm not bashing anyone's product and I think I kept my post as neutral as I could. Just for all of you naysayers I will re-dyno at Speedworks (the original dyno with my Dynatechs) and post the results.

CNB

A lot of forum members said that my results with the Dynatech headers were right where they should be.

T_Vert

computer variables not physical.

Dav

CNB

TT_Vert, I was there watching the whole time. This thread is about header results not a shop's dyno.

0Jeff @ TPE

If you ever knew what went into skewing a Dynojet Dyno you would know that these numbers are correct. With a Dynojet Dyno you cant just type in a few different numbers and change the figures. You actually have to change the calculations in the software itself. And this can "Only" be done if you know someone at Dynojet who would tell you how and where to do it.

Lets just say Lou purposly put his entire reputation on the line for a couple of HP, the correction factor would change "Both" graphs so the percentege of change would be the same.

My .02 has been deposited

'06 Quicksilver Z06

I have heard it said, and I believe it, that a skilled dyno operator, if he were so inclined, can manipulate dyno results.

It would be interesting to see what it dynos now on the original dyno.

T_Vert

yeah very easily skew. and i do know what is involved in doing just that. Regardless, these #s are huge for LG and their headers. Either way, the #s mean much more when they come from an independant.
also, if you've ever used winpep u know you can change just one run w/o messing w. the others. I can show you what i Mean if you want proof.
Dave

0Louis @ LG Motorsports

How many of you that state that the dyno can be manipulated, have actually used one and not gotten this info second hand from someone?

The older winpep software from 6 years ago had to have human inputs for things such as temp and barometric pressure.

We did not spend thousands of dollars to get rid of this variable only to be called liars.

Just wait for more results from other shops around the nation

Louis

www.LGMotorsports.com

0Jeff @ TPE

Lou
I was the Natl Sales Manager for D/J for over 3 years with 5,000 plus Dyno Runs. I was one of the guys who actually helped design the Original Winpep Software. Remember the old version 4.95?? You could change those numbers ALL DAY LONG

People dont realize what is involved in changing the PID'S in the software to falsify the numbers.

Just for "EVERYONES" information. The correction factor is "Automatically" calculated by the hardware stack. You DO NOT have the ability to change these readings. You would literally have to put the hardware stack in a seperate room and the change those atmospheric conditions like Barometric Pressure, Ambient Air Temprature. etc....

If the shop uses PEP 4.75-4.95 Then you can change the numbers to your liking.
I appologize for going off track of this thread

0Jeff @ TPE

On the windows version"WINPEP" you CAN NOT change the correction factors after the run has been stored.

Although, I did resign from my position in Feb 2002 so maybe there is a new program that allows this. Although I doubt it cause the head of R&D is one of my very best friends and he would have mentioned a new program

Dont get me wrong I'm not trying to start a debate or discredit anyone of their knowledge. I am mearly stating the design of the Dyno and it's software.

T_Vert

im using 7.0.3.5
im gonna have to play around some and manipulate some #s for fun

I just changed the CF to SAE, DIN, EEC, STD and JIS

With just smoothing and correction I can go from as low as 330.60 to 339.31 on the exact same run.
Dave

0Jeff @ TPE

You are using a much newer program than the one we designed before I left. So if it "Can" be changed now I will then stand corrected.

CNB

TT_Vert, You've made you opinion known. Now I'd appreciate it if you quit argueing about the ability or inability to change numbers. Thanks.

T_Vert

Just making it known how easy it is to change #s. It took me 20 seconds to do what I did.

I just changed the CF to SAE, DIN, EEC, STD and JIS

With just smoothing and correction I can go from as low as 330.60 to 339.31 on the exact same run. (A dyno run i have a log of)
Dave

0Louis @ LG Motorsports

Now, take 2 runs in the same window and manipulate them, as you say, and watch BOTH graphs skew