Automatic trans shifting
I am wondering if any of the Stock racers have ever set their transmissions up to shift automatically.Just finished watching the video of Sterling Simmons C/SA (in the magazine portion of this site) and you can clearly hear the rpm change yet the shifter handle doesn't seem to move. Would the computer in the car be controlling the shifts with the shifter left in "D" or ?
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Re: Automatic trans shifting
In Stock Eliminator, cars originally equipped with automatic transmissions that were shifted electronically by the computer as delivered from the factory can use "E-shift" systems, even on transmissions that were not original to the car, and did not originally have "E-shift". So a late model EFI car can use "E-shift", but an older carburetor equipped car cannot. Some older cars are equipped with "auto 1-2" valve bodies. Those cars leave the starting line with the shifter in 2nd, but the car leaves in 1st, then shifts to 2nd at a pre set RPM. The "auto 1-2" feature is controlled by the governor and the vacuum modulator in most cases.
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Re: Automatic trans shifting
I think paul forte at Turbo Action lobbied to make it legal for the older cars but got shot down I think if they can have we should too C/sa
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Re: Automatic trans shifting
My Opinion: Stock trans with OEM electric shift is OK unmodified. Otherwise, all transmission shift upgrades should be driver activated. It's called racing, not programming for Gods sake.
Dale |
Re: Automatic trans shifting
What about a stock 727 ? No plates or vb just put it in drive and go.
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Re: Automatic trans shifting
I wonder if Helms, Hughes, Waldo and the rest had auto shift.
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Re: Automatic trans shifting
I have a turbo 400 that has the modulator and weights set up so that it will shift at 5800 just putting it in drive and go. We have the electric kick-down on a switch if you turn the switch on it shifts at 6500 both shifts. Takes some testing to get them right but works great once you have it.
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Re: Automatic trans shifting
I know Paul Crowe set some up to shift their self,just leave in drive and go.
I have always thought it was funny all these guys talking about they had to have rpm activated air shifter to be competitive and running a glide, You can't click a shifter once at about 330'consistently. Mike Taylor3601 |
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Re: Automatic trans shifting
The 727 trans can be set to shift at any rpm with gov weights too, in fact the factory did this with the Hemi trans over the regular trans. I've heard of company's that sell a range of rpm weights.
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Re: Automatic trans shifting
On our Torqueflites...If the trans temp changed the shift points would
seem to change a bit. |
Re: Automatic trans shifting
That's an interesting consideration:temperature induced viscosity changes of the fluid and what it would do to a shift point.It's getting easier to manage water temperature for consistencies with the electric fans and water pumps and all, but how can we integrate a means of ATF temperature control for the same reason?
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Re: Automatic trans shifting
One huge problem with using the governor to control shifts is that not all race engines require the same RPM at every shift for both performance and consistency.
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Re: Automatic trans shifting
I worked hard on a Ford C-4 to get the shift points where We wanted them and it worked well. After many passes the converter failed so to save time and get back racing I installed a manual valvebody trans. off the shelf and raced it. I was just as consistent manually shifting as the automatic shifting of the other unit. I now have the auto shift back so I can pay attention to other aspects but consistency was not a big difference. My combo has a pretty big window to shift, some could be more sensitive.
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A&A Transmission sells the governor weights for Torqueflites. I built a 727 a few months ago for my street (and occasional strip) car. I removed the stock weight for a "5600 RPM" weight from A&A. There is a noticeable difference when just holding them in your hand. I noticed though afterwards that the trans shifts really quick now. It doesn't lose any RPM's when shifting, but it will shift into high gear in about 250-300' in normal driving conditions. The car is deadly consistent though (Thanks in part to the fresh Select Converter!)... |
Re: Automatic trans shifting
http://www.hotrod.com/articles/sema-...al-valve-body/
T400 E-shift. Can work off a Holley or AEM Computer or with a Turbo Action shifter. Been testing for a year, and working out bugs. |
Re: Automatic trans shifting
I think if you are going this route then you'd better be racing with the 4L60E transmission that e-shift was used on! Running a TH200 or 350 with e-shift should be illegal. Those transmissions never came with an electronic shift and this whole E-Shift bull**** in stock eliminator has gotten way out of hand. How is this any different from super stock?
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