Dumb dyno question....auto vs manual.
Thread Starter
Melting Slicks
Joined: Oct 2005
Posts: 2,056
Likes: 8
From: Redruth Cornwall
Dumb dyno question....auto vs manual.
Just been looking at some really cool dyno videos and it seems most were manual cars.
The dyno operators seemed to run the car through the gears into top then floor it from low revs and do the run.
I was just wondering how this would work on an auto car...the dumb part..if you floor the auto it will kick down...
So, for an auto, would you put it into 1 and floor it to redline or whatever cut off point you want?
Sorry if its dumb but just got me to thinking.....
The dyno operators seemed to run the car through the gears into top then floor it from low revs and do the run.
I was just wondering how this would work on an auto car...the dumb part..if you floor the auto it will kick down...
So, for an auto, would you put it into 1 and floor it to redline or whatever cut off point you want?
Sorry if its dumb but just got me to thinking.....
Drifting
Joined: Jul 2005
Posts: 1,623
Likes: 29
From: The Netherlands
My dyno guy didn't unhook anything and made some decent runs (for a stock '79 L48). Only problem he said auto's have was measuring torque. I don't know the first thing about it, but if he says so...
Here's a video of the first run, don't know why didn't put it on Youtube, but it works: http://www.archive.org/details/first...run_24_03_2006
Here's a video of the first run, don't know why didn't put it on Youtube, but it works: http://www.archive.org/details/first...run_24_03_2006
Team Owner
Joined: Jul 2001
Posts: 182,997
Likes: 88
From: Lakeland, FL
Cruise-In IV-V-VI-VII-VIII Veteran
St. Jude Donor '03, '06, '17
I'm sure that this works with some transmissions.. However, on a TH200R4, the kickdown cable (TV cable) contolls the line pressure and if you unhook it and run the transmssion hard, it could lead to transmission failure... (at least that's my understanding). I'm no expert on the subject though...
Safety Car
Joined: Oct 2004
Posts: 3,926
Likes: 739
From: Youngstown Ohio
Just been looking at some really cool dyno videos and it seems most were manual cars.
The dyno operators seemed to run the car through the gears into top then floor it from low revs and do the run.
I was just wondering how this would work on an auto car...the dumb part..if you floor the auto it will kick down...
So, for an auto, would you put it into 1 and floor it to redline or whatever cut off point you want?
Sorry if its dumb but just got me to thinking.....
The dyno operators seemed to run the car through the gears into top then floor it from low revs and do the run.
I was just wondering how this would work on an auto car...the dumb part..if you floor the auto it will kick down...
So, for an auto, would you put it into 1 and floor it to redline or whatever cut off point you want?
Sorry if its dumb but just got me to thinking.....
Put the car in "drive", and slowly let it go through the gears until high gear is reached (around 3000 rpm). Then slowly climb to 3500 rpm, then floor it for the run. Though on the street the trans will kick down to a lower gear if driven this way, it dosen't do it on the dyno because the loading seems to be different. Also, if you have a high stall converter (3000 rpm or so as I have), it is still multiplying torque at lower rpms and you get a higher rear wheel TQ reading than a manual with the same engine.
Thread Starter
Melting Slicks
Joined: Oct 2005
Posts: 2,056
Likes: 8
From: Redruth Cornwall
I did wonder if it had something to do with the dyno loading that would prevent a kickdown.
My car has the stock TH400 trans and the kickdown wasnt working for sometime so I would have no worries disconnecting if required. Thanks all.
As a side thought does a dyno actually measure torque and then power is calculated using a mathematical formula?
My car has the stock TH400 trans and the kickdown wasnt working for sometime so I would have no worries disconnecting if required. Thanks all.
As a side thought does a dyno actually measure torque and then power is calculated using a mathematical formula?
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