Who has used a chassis dyno and did it help your tune?
#1440573
05/22/13 03:59 PM
05/22/13 03:59 PM
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Joined: Jan 2003
Posts: 15,439 Val-haul-ass... eventually
BradH
OP
Taking time off to work on my car
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OP
Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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The local Import Tuner shop that did my Subaru WRX "makeover" last year has a chassis dyno. That got me wondering about whether it would be a benefit to strap The MoPig (once running, obviously) down on it to see how it performs, maybe get some baseline air-fuel curve #s, etc. Their shop foreman runs an Outlaw 10.5" Chebby, so it's not like they don't know what a carbureted American V8 is. Also, they seemed pretty interested in having my car on their chassis dyno after showing me videos of a 700+ RWHP modified supercharged Shelby 'stang on it. So, who here has used a chassis dyno and did it really help w/ getting your tune dialed in? Or should I save the $$$ for test & tune entry fees at the track and dial it in the old fashioned way?
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Re: Who has used a chassis dyno and did it help your tune?
[Re: BradH]
#1440574
05/22/13 04:25 PM
05/22/13 04:25 PM
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Joined: Nov 2003
Posts: 1,969 Chandler, AZ
Duner
top fuel
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top fuel
Joined: Nov 2003
Posts: 1,969
Chandler, AZ
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Usually the track is too crowded to make enough passes to try different things to see what works best. So the dyno makes much more sense for tuning experimentation. You can see immediately what helps and what hurts without some of the inconsistencies that happen at the track if you are strictly comparing timeslips. The wideband and graphing capabilities on the dyno help a ton. The dyno has also helped me diagnose transmission problems correctly when I couldn't really pin down the problems at the track. Imagine what this felt like? hehehe You will still need to play with things like launch rpm and tire pressures at the track - but at least you can already be done tweaking things on the engine.
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Re: Who has used a chassis dyno and did it help your tune?
[Re: BradH]
#1440576
05/22/13 04:30 PM
05/22/13 04:30 PM
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Joined: Jan 2003
Posts: 3,575 The Netherlands
BigBlockMopar
master
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master
Joined: Jan 2003
Posts: 3,575
The Netherlands
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This is not a dragracer, but just a dailydriver which I tuned for 1.5 year by ear, buttdyno, vacuum- and AFR-gauge. I went to the dyno just to get a baseline HP-number and to see what the low cr 318 still put out. At the location after the first run the shop-owner asked if I wanted to try something on the engine to see if there's more in it. I didn't bring anything useful but I decided to try some minute changes in timing and mixture adjustments. All the changes I did during the 5 consecutive runs made the engine put out less HP then the first run... Was nice to find out I have a well calibrated buttdyno...! This reply is of not much use in a racecar but just felt like sharing anyway...
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Re: Who has used a chassis dyno and did it help your tune?
[Re: BigBlockMopar]
#1440584
05/22/13 06:57 PM
05/22/13 06:57 PM
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Joined: Jul 2005
Posts: 1,301 Penna
70satelliteguy
pro stock
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pro stock
Joined: Jul 2005
Posts: 1,301
Penna
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"BigBlockMopar " Did the Dyno you used have a roof leak? Mike
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Re: Who has used a chassis dyno and did it help your tune?
[Re: sixpackgut]
#1440586
05/23/13 12:35 AM
05/23/13 12:35 AM
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Joined: Jun 2007
Posts: 2,646 Plymouth Meeting, PA
bigtimeauto
Trophy Winner
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Trophy Winner
Joined: Jun 2007
Posts: 2,646
Plymouth Meeting, PA
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I chassis dyno lots of cars but you guys can keep your AF meters i pull plugs.
BB, TT5,Procharged 3300lb Street Car 4.79/154
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Re: Who has used a chassis dyno and did it help your tune?
[Re: sixpackgut]
#1440587
05/23/13 12:41 AM
05/23/13 12:41 AM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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I have been on a dyno twice... once was on Woodward ave. for a demo run for show and tell... my car got rained on sitting on my open trailer out there and it poured water in my dist... I didnt know this untill after I was up past 4000 rpm and it started breaking up... then I went on Jakes dyno a few weeks later just for kicks to see what it made
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Re: Who has used a chassis dyno and did it help your tune?
[Re: sixpackgut]
#1440589
05/23/13 05:51 AM
05/23/13 05:51 AM
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Joined: Jan 2003
Posts: 32,394
Quicktree
I Win
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I Win
Joined: Jan 2003
Posts: 32,394
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Quote:
Quote:
i did, had the A/F perfect on the dyno. got to the track and it was almost a second slower. leaned it out and went back to where we were.
why would that be? were you tuning for most hp on the dyno or best A/F?
A/F with a new e-85 carb.not really concerned about hp. looking more for consistency
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Re: Who has used a chassis dyno and did it help your tune?
[Re: 70satelliteguy]
#1440590
05/23/13 06:13 AM
05/23/13 06:13 AM
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Joined: Jan 2003
Posts: 3,575 The Netherlands
BigBlockMopar
master
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master
Joined: Jan 2003
Posts: 3,575
The Netherlands
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Quote:
"BigBlockMopar " Did the Dyno you used have a roof leak? Mike
This was needed as extra cooling for the room to counter the heat from all that horsepower my little pony-Dart put out...
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Re: Who has used a chassis dyno and did it help your tune?
[Re: sshemi]
#1440592
05/25/13 08:11 AM
05/25/13 08:11 AM
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Joined: Aug 2004
Posts: 2,128 sweden
sshemi
top fuel
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top fuel
Joined: Aug 2004
Posts: 2,128
sweden
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