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Old September 14th, 2003, 02:55 AM   #1
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Dyno with VTEC and without VTEC

For those that wonder what our powerband looks like without VTEC and with the CL-S camshafts, never posted this dyno run, so here it is...

Run #1 was with VTEC set at 6700 RPM, or basically non-existent.

Run #2 was with VTEC set at 4500 RPM.

Manifold valve was set at 200 RPM (Don't ask me why, I had stuck it at this point on the very first dyno day just to see what the powerband would look like, and left it there on accident).

You can see the powerbands cross at 4800 RPM, where power starts to dip on Run #1 and at that point and before on Run#2, power dips slightly at VTEC engagment/before, and then rises slightly/maintains on torque but climbs on hp after that point on Run#2 at 4800 RPM.

So I do think this goes to show the best engagement point for the Camshafts is indeed 4800 RPM like the CL-S stock setup.

I'd like to see some of the other people on here with Camshafts installed now dyno their's with/without VTEC set.
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Old September 14th, 2003, 06:34 AM   #2
 
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Interesting

I wish CL-S cams were an easy mod to do .



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Old September 14th, 2003, 02:05 PM   #3
 
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wow- another great find by SoCal ....

thanks a lot for all the great info you've gotten.

now i'm waiting for Ei to fly out here to put 'em in.
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Old September 15th, 2003, 07:17 PM   #4
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Very nice done Chad. Good you put a comparision of a dyno between 3500rpm VTEC engagement and 4500. I just wanted to see why the 4500 was the better of the 2.
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Old September 15th, 2003, 07:25 PM   #5
 
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Nice info Chad.

SignetAkkord (Van) recently had his VAFC/cams tuned, and the dyno operator/tuner set his VTEC at 4,100RPMs. He played around and found that for the most"straight" power curve was at this VTEC point.

I will see what happens with mine soon...
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Old September 17th, 2003, 02:39 AM   #6
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Quote:
Originally posted by Doom878 on September 15th, 2003 at 06:17 PM

Very nice done Chad. Good you put a comparision of a dyno between 3500rpm VTEC engagement and 4500. I just wanted to see why the 4500 was the better of the 2.
Here you go bud...

This dyno was right after that freak dyno with 229 whp. You won't be able to tell, but the graph's curves are EXACTLY the same as that previous one, only it's REAL and not the crazy 229whp.

Notice the drop in power at 3500 RPM. The torque never tops out around 150 ft-lbs like the other one, or above it as the next one I'm gonna post with VTEC engagement at 4800 RPM.

And horsepower never tops to around 112.5 hp around 3800 RPM, instead its well below 100whp at 3800 RPM.

Putting all three graphs on top of eachother in the light also shows variances at myriad of RPM, which I'll discuss with the next graph.

So here it is:

VTEC: 3500 RPM Manifold: Unknown (I think still the "200 RPM")
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File Type: jpg dyno - uti 11.jpg (62.9 KB, 126 views)
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Old September 17th, 2003, 02:45 AM   #7
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And here's another with two runs.

Dyno Run #5 : VTEC = 4800 RPM Manifold: Not listed (Unknown)

Dyno Run #6 : VTEC = 4800 RPM Manifold: 4000 RPM


Notice how much higher the beginning torque curve is at 2500-3500 RPM vs. the one I posted with Manifold engaging at 200 RPM and VTEC engagement at 4500 RPM. It's closer to 150, where as the first one I posted on this thread is closer to 125.
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File Type: jpg dyno - uti 10.jpg (77.6 KB, 120 views)
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Old September 17th, 2003, 02:50 AM   #8
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..
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Old September 17th, 2003, 02:57 AM   #9
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I noticed that the drop of torque at 3500rpm on the 1st dyno vs. a straight torque line on the 2nd one. Is that what you mean? Also that the hp is like 15hp higher starting from 4000.
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Old September 17th, 2003, 04:01 AM   #10
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Quote:
Originally posted by Doom878 on September 17th, 2003 at 01:57 AM

I noticed that the drop of torque at 3500rpm on the 1st dyno vs. a straight torque line on the 2nd one. Is that what you mean? Also that the hp is like 15hp higher starting from 4000.
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Old September 17th, 2003, 04:02 AM   #11
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...
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