Scheduled a Dyno run, advice requested
Racer
Joined: Jun 2006
Posts: 305
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From: Louisville, KY
My bone stock 85 on a Mustang Dyno was...
233.9 hp @5500
241.2 tq @2500
weight was set to 3619
hp @50 was 12.30
All runs in 3rd (Auto) and all stopped at 5500 rpm because I didn't know I should go to 6.
233.9 hp @5500
241.2 tq @2500
weight was set to 3619
hp @50 was 12.30
All runs in 3rd (Auto) and all stopped at 5500 rpm because I didn't know I should go to 6.
Drifting
Joined: Aug 2006
Posts: 2,232
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From: lawrence,kansas
hey popo928,
why do you leave the car in 3rd for the runs and not just let it run up in drive to reach 4th. Does it take too long to do the run in drive?
thanks for the info in advance
andy
why do you leave the car in 3rd for the runs and not just let it run up in drive to reach 4th. Does it take too long to do the run in drive?
thanks for the info in advance
andy
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I think we did dyno runs with the auto cars with the TV cable disconnected, selector in position 3 to manage roller speeds. So long as you always follow the same protocol when you test, whatever that protocol might be, you'll have usable numbers. If you just leave the car in "drive" and let it run up through the gears on its own, you'll get stairstepped readings that you'll want to manually integrate into a single curve anyway, plus you'll have different losses in each gear. IMHO, it's better to just choose a gear to do the pull, and do the whole thing in that gear to get one curve out of the machine.
Win98 SE supports floppy disks, and also CD writes if the hardware is present. It has a tougher time with memory sticks, since not many new stick drivers are resident in the old OS. Some sticks have drivers embedded to look like a hard drive, may or may not work though. Still, the data file on a floppy will be worth a lot more than a fuzzy printout.
Win98 SE supports floppy disks, and also CD writes if the hardware is present. It has a tougher time with memory sticks, since not many new stick drivers are resident in the old OS. Some sticks have drivers embedded to look like a hard drive, may or may not work though. Still, the data file on a floppy will be worth a lot more than a fuzzy printout.
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Thansk for the comparison Popo. Was yours maxed out at 5500 or was there more to go? And we used the weight and HP numbers straight out of the Mustand "book". How did you come up with your weigh/HP @ 50 numbers?
Racer
Joined: Jun 2006
Posts: 305
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From: Louisville, KY
Everyone I asked that dynoed the autoboxes said to disconnect the kickdown switch and do it in third gear as it provided the closest 1:1 ratio, as 4th does in the stick. I assumed it was true and never checked.
Beerfish - It's hard to tell if it was maxed or not. The curve was still rising at 5500 rpm so I'd assume so but probably not much. I called Pizza (Charles Pizalato) from the dyno and had him look the weight up online. If I remember correctly, we added my body weight too. I don't recall his source though.
Beerfish - It's hard to tell if it was maxed or not. The curve was still rising at 5500 rpm so I'd assume so but probably not much. I called Pizza (Charles Pizalato) from the dyno and had him look the weight up online. If I remember correctly, we added my body weight too. I don't recall his source though.
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Auto boxes are closest to 1:1 in top gear. Ditto the 5-speeds, which are exactly 1:1 in fifth. Theory is that there's lowest losses in those gears, but dyno operators get nervous and start pissing themselves when the rollers get around 200MPH. The lower gear thing is true in most 'murican cars but not in your 928. No overdrive available. If you want to go 170, overdrive won't cut it.
The "kickdown switch" and the TV cable are disconnected for dyno runs as stated previously. you want to run in the highest gear that the operator will allow to cut down on the negative effects of inertia in the driveline. It's really a bogus problem since the gearbox "corrects" for it, but third gear in the auto box will spread the run out more over time and give you a higher-resolution look at engine performance because of that.
The "kickdown switch" and the TV cable are disconnected for dyno runs as stated previously. you want to run in the highest gear that the operator will allow to cut down on the negative effects of inertia in the driveline. It's really a bogus problem since the gearbox "corrects" for it, but third gear in the auto box will spread the run out more over time and give you a higher-resolution look at engine performance because of that.
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The "kickdown switch" and the TV cable are disconnected for dyno runs as stated previously. you want to run in the highest gear that the operator will allow to cut down on the negative effects of inertia in the driveline. It's really a bogus problem since the gearbox "corrects" for it, but third gear in the auto box will spread the run out more over time and give you a higher-resolution look at engine performance because of that.
I am doing a dyno run tomorrow, first time
How do I disconnect the kick down switch and what is the TV cable?
Edit: think I got it.
Last edited by Leon Speed; Jun 20, 2008 at 09:01 PM.
