nitrous power loss on dyno

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Apr 24, 2013 | 05:26 PM

#21

Jason Haines @ LPE

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From: Decatur, IN

Dip in graph - possible clutch slip

To see if the dip in the graph is clutch slip have them plot a graph showing engine RPM versus chassis dyno roll speed (MPH). If it is clutch or tire slip you will see a change in the slope of the line in that area.

Quote:

Originally Posted by k_garretson23

looks like the clutch slipped, i have a similar dip in my graph.

Apr 24, 2013 | 05:30 PM

#22

Jason Haines @ LPE

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Joined: Oct 2002

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From: Decatur, IN

Knock

Does the calibration have the knock sensitivity changed? Could it be real knock that the ECM/PCM isn't noticing? A good way to check that is to put much higher octane fuel (aka knock unlimited fuel) and see if it changes. If you are on 93, try VP109. If it goes away then it was probably knock. If it doesn't then it is probably something else.

Quote:

Originally Posted by boostinsidewayz

The tuner looked at the logs and said it pulled no timing. He's a reputable ls tuner, so I don't think he would have missed it after 3 pulls. I appreciate your help but I don't think that's it.
I just swapped solenoids and ran new wiring. Gonna go for a test drive soon.

And when he changed the timing for the nitrous, 4* being pulled while running all motor, it only dropped 10hp

Apr 24, 2013 | 07:17 PM

#23

ShiznityZ28

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From: GB MD

i just doubt its slip or random if its exactly 2.5 in every time and its not the same rpm.

Apr 24, 2013 | 10:53 PM

#24

itsslow98

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From: Maryland

Yea its weird that it would slip after peak torque and mid pull.

Apr 25, 2013 | 01:51 AM

#25

boostinsidewayz

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Quote:

Originally Posted by brandon@nitrousoutlet

Did he look at the voltage?

Quote:

Originally Posted by Roger Blackmore

X2 on the voltage. Check it in the data log. I've seen voltage drop do some weird stuff.

i dont know if he looked at the voltage. he is on vacation so i wont know until next week sometime.

Quote:

Originally Posted by Jason Haines @ LPE

Quote:

Originally Posted by Jason Haines @ LPE

i'll try putting some high octane fuel in it.

Quote:

Originally Posted by ShiznityZ28

i just doubt its slip or random if its exactly 2.5 in every time and its not the same rpm.

Quote:

Originally Posted by itsslow98

Yea its weird that it would slip after peak torque and mid pull.

i appreciate everyones help in getting this figured out, track rental is monday, and i really want to jet it up before then

i upgraded all the wiring to 12 gauge. and i swapped out both solenoids with ones that were still in the box from nx after getting rebuilt.
i can still feel the dip in power