Back to back to back dyno runs and a heat question

Jman5000 · Feb 10, 2002

Did 3 pulls today and A/F was a little lean till 2500, then right on (13 or so) all the way out to 5K, then it got richer.
Pull 2 got richer sooner, and 3 sooner than that.
Due to heat they shop told me...anything else it could be? HP and torque dropped too...but very little.

chris86vw · Feb 10, 2002

Re: Back to back to back dyno runs and a heat question (Jman5000)

How long did you have between runs
chris
[email protected]

Jman5000 · Feb 10, 2002

Re: Back to back to back dyno runs and a heat question (chris86vw)

A minute or so. Basically enough time to plot the data, and start up again.

AxeAngel · Feb 10, 2002

Re: Back to back to back dyno runs and a heat question (Jman5000)

wideband a/f?
or the gauge in your car?

chris86vw · Feb 10, 2002

Re: Back to back to back dyno runs and a heat question (Jman5000)

That is definitly not long enouhg on a 1.8T, you need aout 5 minutes minimum, preferably close to 10 minutes.
chris
[email protected]

20Vhybred · Feb 10, 2002

Re: Back to back to back dyno runs and a heat question (chris86vw)

Hey Chris if you spray the IC down between runs can you do the rund closer together then 10min?

chris86vw · Feb 10, 2002

Re: Back to back to back dyno runs and a heat question (20VsilvrGTI)

Yes but then the only accurate way to do runs is to use somethign to read the heat of the IC to make sur eyou start at the same temp everytime, or the runs wont' be accurate. The day I did hte 30+ pulls, I used ice water to cool down the intake manifold and IC to the same temp before each run. It was hte only way to accuratly get the runs in one day and have them be accuate.
chris
[email protected]aol

AxeAngel · Feb 10, 2002

Re: Back to back to back dyno runs and a heat question (chris86vw)

just be careufl when using ice water around ur exhaust manifold and other hot parts of your car.

dbrowne1 · Feb 10, 2002

Re: Back to back to back dyno runs and a heat question (Jman5000)

Chris ran 4 dynos in a row on my car and let the fan blow on it at idle for 5-10 minutes between, and checked the manifold and IC temps with an infrared gun. My pulls were all within 1 hp/1ft-lb of each other.

Jman5000 · Feb 10, 2002

Re: Back to back to back dyno runs and a heat question (AxeAngel)

Wideband a/f.
There was a tall circular fan blowing on the front, and a small one on the IC.
They misted the IC between runs 1/2.
So more ideal conditions would be to run, wait 5 min (mist IC), and then go again?

Back to back to back dyno runs and a heat question

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