Tomorrow will be my second Dyno run ever done.

Didn't reset ECU prior to my base runs, should I not reset prior to tomorrow runs?
Is there an advantage to doing this?
Is it more accurate or is letting the ECU learn the mods for awhile before Dynoing more accurate?

Sorry for so many questions.

Thanx.

BTW, Prior to this question, I did a search and couldn't find an answer.

 

Resetting the ECU will put the computer back to a default mapping for fuel/ingnition/etc. Over time, the computer will monitor the various engine sensors and make adjustments to the timing and fuel trims to compensate for conditions. After 500 miles with any aftermarket parts, the ECU should have adapted as best as it can to the new parts. Resetting the ECU at this point may actually give you lower numbers than if you didn't, since your car should be adapted to the aftermarket parts already.

One thing you may want to do, however, is to drive (more?) agressively the day that you're supposed to get the dyno done. The computer should partially adapt to the agressive driving and adjust the ignition and fuel maps for the driving style. It could be good for some slightly higher numbers that if you had just driving the car normally. That is unless you drive like a maniac all the time.

 

Ahhh...Kurt to the rescue.... ...correct name, right?...

Thanx for the response. Was aware of the basic learnings of the ECU, but still appreciate the explaination.

Heard of many ppl reseting their ECU right after a mod and just before a Dyno run. You verified my simple minded logic of what may happen reseting just prior to pulls.
(makes sense that it needs a little time to relearn and adjust)

Have about 1000 miles on my new mod (exhaust) so ECU has learned mod for sure. Lately, even today, purposely doing WOT and heavy foot general driving. Should help.

Will try to do aggressive driving just prior to Dyno that morning. Should be easy, my son will be with me heading to Concord (not my wifey ). He eggs me on and loves it.
Guess I'm a bad influence, son's won the lotto with the CHP twice within the past few months in his Lude.

Got a 1 gig flash drive today too, so I'm set for my downloading .drf files.

Thanx again.

 

It's Kurtis, but close enough. I'm glad I could help.

Have a great time tommorrow. It sounds like there will be some nice father/son bonding time. Just no getting any tickets, otherwise you'll never live it down with him. Enjoy!

 

++++111!!

 

Keep it consistent. Do whatever it was that you did when you got your first dyno. Consistency is key. Same dyno, same wheels, same gear, etc.

 

Thanx Kurtis and DavidB.
Hmmm...I know consistency is the key. Thanx. Unfortunately the Dyno is going to be a different one that my base pulls were done on and very different ambient temps, minus 15-25 degrees F.
So the results will not be too valid on what actual gains (if any) I'll see with my Injen Dual track edition exhaust compared to my base numbers.
The only thing consistent will be my pop chrgr/Ztube, brand of fuel, tires, mileage on oil, previous driving aggression, freeway cruising to Dyno site and pulls in 4th (6mt).
Hmmm...will leave the VDC off this time too on pulls, though I doubt my tires will start slipping on the drum.
Not pulling that much hp/tq to be a given problem (running 285/30/20 KDW2's), but ya never know.
Thanx for the imput guys.

 

Sounds like a waste of money to me. Ideally, it really needs to be on the same machine or at least the same model. This is the only way you can really get a good comparison. If the temps will be higher this go around, then put some ice on the intake manifold to cool it a little.

 

does leaving the VCD on/off make any difference? I hear stories about ppl felt more hp with the vcd off so I'm wondering if u would gain more hp with it off.

U should do 2 runs: 1 with VCD on and 1 without it on.

 

with VDC on, they won't be able to dyno the car.

 

Three pulls with A/f was only 30 bones...group rate.
Same type of machines, DynoJet 224, but relize physically not same Dyno machines.
Temps on base 88-90, temps today 81-84.
Hp/Tq higher with Injen exhaust, but I'm not concluding these as accurate comparision gains. Perhaps some day I'll go to the place I had my base done at and then I'll have a better representation of my gains. Maybe a Dyno Day there...less $$. Then I'll compare differences and come up with my own correction factor to between the two machines to use in future pulls on the machine I was on today and will use in the future.
For 30 bones I feel it's not a complete waste of money. This shop today is much closer and will probably use in the future for any additional mods I do.
Thanx for your imput. I'll remember the ice thing if ambient temps get up there next time around.
Asked this same question at the Dyno Day today. Overall consenses was all the G/Z's were strapped down tight enough that your tires aren't going to start loosing traction on the drum plus not pulling crazy hp/tq anyways.
The variance I decided to do today on my pulls was runs in 4th and runs in 5th.(1:1). Dyno shop on my base pulls wouldn't do pulls in 5th. I'm talking a 6mt here btw. Found no real differences between 4th and 5th pull numbers. The Dyno varies enough between pulls that I did find it inconclusive that you pull more hp/tq in 5th. My best pull in hp was in 4th, in 5th best was only .91 hp less. Dynoes numbers within themselves will vary more than that.
Did all three pulls on my base with VDC on and no problems, plus ppl today the same, no problems. I disagree with your statement.