Blip on the Dyno Chart

Cablelawyer · 03-15-2007, 05:51 PM

I did some dyno pulls with my 06 Civic Si yesterday. The graph for the first pull looks fine. But every pull after that produced a "V" shaped dip in hp and torque with the downward trend starting just before 6600 rpm and rising again at 6800. Did not hear any engine ping, but according to the dyno the car was definitely cutting back power temporarily and then coming right back to 100%. Has anyone else seen this on their dyno charts?

PDF attached. (The first chart is my Si vs a `07 Cooper S - turbo - note the Cooper S was tested in 20 degree cooler temps). The second chart is my first pull with the Si vs the third pull which was performed after a cool down period of about 10-15 minutes).

Jeff J.

taejinah · 03-15-2007, 06:02 PM

uhh... "V" tec? lol... i dunno ~.~

mfinlay04 · 03-15-2007, 06:12 PM

Weird sh!t man!! That's def not the vtec cross over as you can see that's happening before the "V" dip. Did they monitor the A/F ratio? would be interesting to see what is happening during that drop

jdecker · 03-16-2007, 12:45 AM

I am not sure but, on every dyno I've seen with a vtec equipped honda, I noticed a sharp dip right before it engaged. Isn't it the cam switching to the different lobes?

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03-15-2007, 06:02 PM	#2 (permalink)
taejinah Senior Member Join Date: Mar 2006 Posts: 399 iTrader: 0 / 0%	uhh... "V" tec? lol... i dunno ~.~

03-15-2007, 06:12 PM	#3 (permalink)
mfinlay04 Senior Member Join Date: Sep 2006 Location: Ontario Posts: 2,000 Matt Finlay iTrader: 3 / 100%	Weird sh!t man!! That's def not the vtec cross over as you can see that's happening before the "V" dip. Did they monitor the A/F ratio? would be interesting to see what is happening during that drop

03-16-2007, 12:45 AM	#4 (permalink)
jdecker Senior Member Join Date: Jan 2007 Location: gainesville, fl Age: 22 Posts: 130 james iTrader: 0 / 0%	I am not sure but, on every dyno I've seen with a vtec equipped honda, I noticed a sharp dip right before it engaged. Isn't it the cam switching to the different lobes?