'97 L36 Dyno Results with Graph - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 04-16-2006, 07:45 PM   #1
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Default '97 L36 Dyno Results with Graph

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Red curves are baseline horsepower and torque, blue lines are after the fifth pull with optimal fuel and timing.

We stuck with 23* timing, because the Intense guys said anything past 24* didn't increase power very much and put the internals at higher risk. 24* was also enough to cause a little KR in my case.

I was disappointed that we didn't come close to 200hp at the wheels, but after much contemplation I think I'm satisfied with the flatness of the curves. There is a lot of area under each one, which is better than steep, peaky curves with higher numbers. I'm sure this is partially due to the cam advance we chose, because the car used to have a sluggish bottom end with a big increase around the 5000 RPM range. I would rather have a nice broad, flat curve than a high peak horsepower at 6000 RPMs. Accordingly, we left my shift points at 6000 RPMs.

Notice the increases all through the power range, as opposed to peaks and valleys. This was the result of corrected fueling, and I'm satisfied with the gains from the tune. If there are any aspects of tuning we didn't address, or other tricks we could have employed to get more power, let us know. We want to improve on this "poor man'*" method as much as possible.

Thanks to everyone who offered assistance and support throughout this project. It has been a lot of fun!
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Old 04-16-2006, 08:53 PM   #2
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Very nice. 190 at the wheels isnt too bad.....what is that at the crank??

and any idea what the stock numbers at the wheels are?
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Old 04-16-2006, 09:00 PM   #3
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Quote:
190 at the wheels isnt too bad.....what is that at the crank??
Usually there is a 20% drivetrain loss so around 236hp at the crank. Very nice. Almost at stock Ser2 L67 levels.
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Old 04-16-2006, 09:04 PM   #4
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Stock is anything from 160 to 165
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Old 04-16-2006, 09:34 PM   #5
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That'* from a cam and head pkg? I would have expected a bit more. Not bad for a NA. Cool to see a NA dyno sheet, I was getting tired of seeing */C dyno sheets.
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Old 04-16-2006, 09:38 PM   #6
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Yes. It'* a head and cam. All of it was done home made(reground stock cam from Delta). All mechanical work done at home. Only thing done in Ohio was the tune. We feel more is possible, but we must regroup and see what may be at fault.
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Old 04-16-2006, 10:16 PM   #7
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Very cool guys
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Old 04-16-2006, 10:31 PM   #8
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For a DIY build like this, I think these are awesome gains for the $.
Here is a chart for a L36 GPGT with a u-bend delete:

As you can see there is A LOT more area under Ben'* curve.
There is over 40 whp gained at 5600. And this powerband is very useable considering the gearing and weight of the car.
These pulls were also done with full exhaust. Other dynos I'm seen with zzp or intense cams were done with larger DPs and cutouts. I know someone dynoed 7whp or so more with a cutout. So if you want to squeeze a little more out, a $30 manual cutout should do it.
I think you guys did great for the work and $ you put in.

Now throw some *&* headers on there with a cut out and get over the 200 whp hump. (just messin )
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Old 04-16-2006, 11:31 PM   #9
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What are the specs on the cam? Also what was done to the heads, just a P&P job or were they milled, have bigger valves??? And what are your other mods?

Shawn
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Old 04-17-2006, 02:41 PM   #10
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Ben can release the cam specs.

Heads were hand ported and milled. Stock valves, stock rockers, LS6 springs and retainers.

Sooo.... Mod list is something like this.

Highflow kitten, home made PEMS, reground cam, home ported milled heads, ported lower, dynotune.
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