2005 RL Stock Dyno Charts:

[dam718]

Howdy folks,

I went and got the RL Dyno'd today to establish real world baseline power and torque measurements which I will use to evaluate performance upgrades as I add them.

I left them all in their original sizes, and will post links only, as they are quite large. There is a lot of small detail that I thought a small picture would be no good for.

Ended up doing 5 runs. The first two didn't go so well as the dyno was spitting out some numbers that were WAY off... Once we got everything squared away, things started looking a little better.

The first "measured" run was in 3rd gear, second run in 4th gear, and third run in 3rd gear.

Don't know what was up with the first couple of runs, she was only putting out 202.87 HP and 203.35 HP respectively. The third time was a charm, and she hit 210.44 HP / 182.73 lb ft. I guess the moon and the stars aligned for that run.

On the "All Runs" charts, the first run is green, second is red, and third is blue.

I've heard some folks say that the RL makes power all the way to the redline. You can clearly see that here. The power curve is damn near linear, and never stops going up til it hits the rev limiter at 6500 RPM.

Very flat torque curve as well for the most part, although there is a more defined "peak" in the curve. Beyond 3000 RPM, it never drops below 170 lb ft. all the way to the rev limiter.

Something else folks talk about is the A/F being pretty rich. That can also be seen on the HP + AF chart. After 4200 RPM, the A/F ratio drops below 10:1 (off the charts rich) and never comes back up.

My conclusion... These things have so much potential power in them it's really unbelievable... We have a wild snarling engine that's just begging to be unleashed!

http://www.dcmsoundworks.com/pics/re...runs-hp+af.jpg
http://www.dcmsoundworks.com/pics/re...-hp+torque.jpg
http://www.dcmsoundworks.com/pics/re...-hp+torque.jpg

[riz906]

what is that 210 or so looks good i used to live in newhaven where did you dyno.

[dam718]

Once the engine got warmed up, the peak HP was 210.44

I'm in New London...

Took it to Bristol Dyno in East Hartford...

Every dyno facility around here wants $100+ for a standard dyno run.

A/F is extra...

At Bristol Dyno, they charged $60 including A/F

It was a no brainer...

[riz906]

what do you have done.

[dam718]

Car is bone stock... 800 miles on it...

[yrethguad]

Nice clear pics. I can see why that one has a limit of 7003 rpm. I think it was an SS. On a thread somewhere. Looks like 7k would be just after that curve you can see starting.

I'm a fan of the torque!

Power doesn't seem to drop off, so that A/F seems to be right on.

[dam718]

I guess I am just used to the 14:1 Ratio for NA / 12:1 Ratio for Forced Induction thumbrule.

Seems like if we could get the A/F up around 12 once the S/C really starts kicking in, we'd see at least a 5 HP gain, possibly more...

And why in the hell is our rev limiter set so low? I'm sure these engines can take more than 6,500 RPM. It would be nice to see a peak in the HP Curve... Almost like we're being robbed of potential power...

You have to wonder just where would it start to peak? I don't see any indication of power peaking off even a little bit... It just keeps going, and going, and going........

[yrethguad]

I can see a curve starting near redline. I'm not thinking you will see any gain by running it leaner.

[Blue04RedLine]

Originally Posted by dam718

I guess I am just used to the 14:1 Ratio for NA / 12:1 Ratio for Forced Induction thumbrule.

Seems like if we could get the A/F up around 12 once the S/C really starts kicking in, we'd see at least a 5 HP gain, possibly more...

And why in the hell is our rev limiter set so low? I'm sure these engines can take more than 6,500 RPM. It would be nice to see a peak in the HP Curve... Almost like we're being robbed of potential power...

You have to wonder just where would it start to peak? I don't see any indication of power peaking off even a little bit... It just keeps going, and going, and going........

Some people believe a consiracy theory in that the "Staged upgrades" from GM will begin with a simple revlimiter bump and other parts in a computer flash to boost HP. The more I think about it, the more I'm one of those believers. Nice numbers by the way. I'm curious to why some people are making so much more torque than others though? I've seen as high as 202wtq on a stock RL.

[dam718]

Maybe they are doing their run in 2nd gear? TONS of torque in second...