Chassis Dyno Tips With C6

[DuckRyder]

Hopefully getting on a chassis dyno this weekend, not sure if I’m the driver or the Dyno guys will do it, but any tips?

I seem to recall someone said put it in second gear hold , but I still think it is going to shift on the governor, so unsure.

[427mach1]

I believe you will want to put your car in third gear for the test; you want direct drive (1:1 transmission ratio).

[pbf777]

        I'd doubt that you would be the driver.   

       Often the "Dyno Guys" will utilize a lower than the "direct" gear (3rd in a manual & 2nd in the automatic) this to reduce the possible hazards associated with the high revolution speed of the tires  including blow-outs; and  it is within the calculation set-up as to the gear ratio stated for correction.   

        Scott.

[DuckRyder]

        I'd doubt that you would be the driver.   

Surprisingly enough, at power tour i was. and with basically no instruction...

From videos ive seen from last years Ford Fest looks like midwest dyno does it for you...

       Often the "Dyno Guys" will utilize a lower than the "direct" gear (3rd in a manual & 2nd in the automatic) this to reduce the possible hazards associated with the high revolution speed of the tires  including blow-outs; and  it is within the calculation set-up as to the gear ratio stated for correction.   

        Scott.

that makes sense.

[fekbmax]

When I put the stang on the chassis dyno a couple years ago with the clutchless jerico I hung a bunch of weight on the clutch and they made the pulls it in 3rd gear.

[galaxiex]

Hopefully getting on a chassis dyno this weekend, not sure if I’m the driver or the Dyno guys will do it, but any tips?

I seem to recall someone said put it in second gear hold , but I still think it is going to shift on the governor, so unsure.

All C6 from 1967 - up, have "manual 2nd" and will NOT shift to 3rd, if the shift lever is kept in "2".
Even from a dead stop, if the shifter is in "2" the trans is in 2nd gear.
Starts out in 2nd and stays in 2nd.

[DuckRyder]

All C6 from 1967 - up, have "manual 2nd" and will NOT shift to 3rd, if the shift lever is kept in "2".

Good to know.

[FrozenMerc]

What type of dyno?

If it is an inertia type (think large flywheel, common on portable trailer type chassis dyno's).  Horsepower and torque is calculated from the change in rotational velocity of the drum.  Wheel slip and how accurately the engine rpm is measured can have a very large effect on the calculated numbers.  The value in this type of dyno is very limited as you can't do any steady state testing and tuning and you are limited to only short WOT acceleration runs.  Basically good for generating a peak torque and horsepower number at the rear wheels, but not much else. 

If it is a proper chassis dyno with an absorber (water brake, eddy current, AC, etc), then you can get much more value out of the exercise.   With an absorber controlled dyno you can do road simulation, cruising, transitions, in addition to full power pulls and longer runs (assuming the dyno has a decent cooling / fan setup).  They should also have the ability to monitor many additional channels of data, temperature, pressures, etc.  This type of dyno will allow you to truly maximize the tune in your car.

[DuckRyder]

Assuming its the same vendor as shown in pictures and video of past events, its a"completely mobile and self-sufficient DynoJet 224X dyno Capable of
2000 HP, 2000 FT-LBS or 200 MPH"

https://www.redline-motorsports.com/pages/mobile-dyno-services

I was just looking for some rough numbers, if they are at the event.

Since it's pouring rain and supposed to continue to do so, they may not even come.

At some point I'll be looking for a local chassis dyno in TN to get more serious.

Edit: it looks like the 244X has an option the be eddy current, but don't know if this one is or not, if they show i will find out.

[pbf777]

Edit: it looks like the 244X has an option the be eddy current, but don't know if this one is or not, if they show i will find out.

     It's not.   

     Scott.

[DuckRyder]

I suppose i really didn't expect it to be.

I'm told they are here but not set up yet, well see...

[cleandan]

Hopefully getting on a chassis dyno this weekend, not sure if I’m the driver or the Dyno guys will do it, but any tips?

I seem to recall someone said put it in second gear hold , but I still think it is going to shift on the governor, so unsure.

All C6 from 1967 - up, have "manual 2nd" and will NOT shift to 3rd, if the shift lever is kept in "2".
Even from a dead stop, if the shifter is in "2" the trans is in 2nd gear.
Starts out in 2nd and stays in 2nd.

I believe this may be incorrect.
1966 was the fisrt year for the C6 and it had a single year different valve body and shift pattern, often refered to as the "green dot" transmission.
Park, Reverse, Neutral, 2 (2nd, 3rd only), Drive (1st, 2nd, 3rd) Low (1st only)

1967 saw a change in the valve body and shift pattern to what we pretty much know as the automatic standard of: Park, Reverse, Neutral, Drive (1st,2nd,3rd gears) 2 (2nd,3rd gears only) 1/low (1st gear only)

Some people refer to the 2 (2nd and 3rd gears only as the "Snow" gear)
There was no 2nd gear only selection for a C6.

[427mach1]

All C6 from 1967 - up, have "manual 2nd" and will NOT shift to 3rd, if the shift lever is kept in "2".
Even from a dead stop, if the shifter is in "2" the trans is in 2nd gear.
Starts out in 2nd and stays in 2nd.

I believe this may be incorrect.
1966 was the fisrt year for the C6 and it had a single year different valve body and shift pattern, often refered to as the "green dot" transmission.
Park, Reverse, Neutral, 2 (2nd, 3rd only), Drive (1st, 2nd, 3rd) Low (1st only)

1967 saw a change in the valve body and shift pattern to what we pretty much know as the automatic standard of: Park, Reverse, Neutral, Drive (1st,2nd,3rd gears) 2 (2nd,3rd gears only) 1/low (1st gear only)

Some people refer to the 2 (2nd and 3rd gears only as the "Snow" gear)
There was no 2nd gear only selection for a C6.

Cleandan, I believe you are incorrect.  From the owner's manual for my 70 Mach 1, the SelectShift automatic, when placed in the "2" position, starts and remains in second gear.  The C6 in my first car, a 72 Galaxie, operated the same way. 

[galaxiex]

Hopefully getting on a chassis dyno this weekend, not sure if I’m the driver or the Dyno guys will do it, but any tips?

I seem to recall someone said put it in second gear hold , but I still think it is going to shift on the governor, so unsure.

All C6 from 1967 - up, have "manual 2nd" and will NOT shift to 3rd, if the shift lever is kept in "2".
Even from a dead stop, if the shifter is in "2" the trans is in 2nd gear.
Starts out in 2nd and stays in 2nd.

I believe this may be incorrect.
1966 was the fisrt year for the C6 and it had a single year different valve body and shift pattern, often refered to as the "green dot" transmission.
Park, Reverse, Neutral, 2 (2nd, 3rd only), Drive (1st, 2nd, 3rd) Low (1st only)

1967 saw a change in the valve body and shift pattern to what we pretty much know as the automatic standard of: Park, Reverse, Neutral, Drive (1st,2nd,3rd gears) 2 (2nd,3rd gears only) 1/low (1st gear only)

Some people refer to the 2 (2nd and 3rd gears only as the "Snow" gear)
There was no 2nd gear only selection for a C6.

Afraid not... and yes there was a 2nd gear only on the C6. (and others)

ALL C6, C4 and FMX Ford 3 spd automatics from 1967 up, have "manual 2nd gear".
This feature is sometimes called "Select Shift" by Ford.

The "2" position is second gear ONLY.
As I said, it starts in "2" and stays in "2".

GM and Mopar if selecting the "2" position on their common 3spd automatics of the day,
both will start out in 1st and shift to 2nd,
and they will make an "emergency shift" to 3rd if you get going fast enough.

Yes, 1966 the first year of the C6 most cars had/have the "Green Dot" as you describe.

There was an option in 1966 for a "Select Shift" or "Sport Shift" C6 (and maybe C4, not sure...never seen one) P-R-N-D-2-1 NO Green Dot.
Fairlane GTA models and I think some 7 Litre Galaxies had this as an option.


BTW I’ve only been rebuilding these things for approx 45 years so I don’t really know anything….😏

[DuckRyder]

Please keep up the discussion on the trans. My valve body and governed are modified, but I assume that’s not something that would be changed, particularly not to shift when it did not stock.

Edit, meant to say Dyno guy canceled..