Well we had a club dyno day, and there were 3 Z28's

a 95 Z28 130k KM (~80k miles) M6 3.42
STOCK down to the paper airfilter
251 rwhp and 305 rwtq


96 Z28 140k miles M6 3.42
STOCK down to the paper airfilter
253 rwhp and 297 rwtq


and my car

96 SS 18k miles all runs with paper airfilter in the ss intake. M6 3.42
Stock, with the same as z28 exhaust
256 rwhp and 289 rwtq

then with cat back exhaust (magnaflow)
263 rwhp and 304 rwtq

then with madwolf power tuning
270 rwtq and 305 rwtq

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EDIT, adding graphs


www.speedinc.ca/catbacktune.jpg

the blue one is with the cat back, and the red one is with the tune too.
I made lots of runs, but just kept the two best ones on the graph.


www.speedinc.ca/baseline.jpg
this is stock for me.



this is a graph with all three of us, best runs.

www.speedinc.ca/allthree.jpg

I'm green,
the 95 is red
and hte 96z28 is blue

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Now my Question

Why was I so much less in the torque area?
and I'm kinda disapointed with my catback gains.


All runs on the same Dynojet and ASE corrected.
working on getting the graphs online

 

What was different between the cars?

6 speeeds/autos

Gears

Need more info.

 

Edited

All 6 speeds, all 3.42

 

You weren't really down all that far on torque. You were only off by 8 lbs from the average (which happens to be 297). If all three of you had done three pulls exactly the same, most likely all of you would have gone up and down on the numbers some. Go get some mods and blow those other guys away on the next dyno day.

 

How close the power figures were blows me away. Factory engines tend to be all over the place on power. Sometimes there can be a 20 HP difference between two identical engines. I am kinda courious that you were down a little on torque, especially since the SS is supposed to be rated higher than the Z28.

I wouldn't be too bumed about your cat back power figures. The real power is in the cat and headers. You open that up and you cat back can really shine. I would love to get my car base linned but there is no place within 50 miles with a dyno.

 

Your cat-back gains were pretty much normal. Why were you disappointed? I wouldn't be... like I said, that's pretty normal

 

That just goes to show that the ram airs dont make that much power over a regular intake box or cai.

 

another thing you have to consider. is the entire graph.
if they're making 305 tq, at 2800, but everywhere before/after that they're only making 240 or less....

but you're making above 250 through the entire RPM band, you're going to pull harder through the entire rpms.

i'm not saying that's the case, but if it is, that might make you feel better.

i'd rather have an engine that made a constant 300 rwtq(which would be almost impossible), than one that just spiked up to 350 really quick and dropped off before and after that.

 

Did they log the air/fuel? I'd like to see if there was a difference in how rich each car ran, and if any of Madwolf's changes were noticeable. 7 rwhp on power tuning is impressive.

 

i assume you're talking about the SS's ram air.....
well, i'm not arguing that ram-air is better than a CAI, or that ram air even works. BUT. seeing as how they're on a dyno, and not moving, therefore no air is being "rammed". i don't see how you could get ram air isn't any better from this comprasison.

 

Mad wolfs was a bit rich after the tune

www.speedinc.ca/catbacktune.jpg

the blue one is with the cat back, and the red one is with the tune too.
I made lots of runs, but just kept the two best ones on the graph.


www.speedinc.ca/baseline.jpg
this is stock for me.



this is a graph with all three of us, best runs.

www.speedinc.ca/allthree.jpg

I'm green,
the 95 is red
and hte 96z28 is blue

 

The cat back gains were a little weak.

 

he got 15 ft/lbs torque. thats not bad at all

 

How were the catback gains weak? Its not like he added a 100shot. 7RWHP and 15RWTQ is good for such a mild upgrade.

And about the ram air deal. They may have more hp from the factory but at the track or street you cant tell a difference from what Ive seen. My buddy has a 02 Z28 and kills ram air cars at the track. Not just at the track street also. They may help a little but not worth the extra money imo.

 

not bad #'s my stock SS with a dirty a$$ paper filter put down 275rwhp and 305tq all stock