Who should rebuild my 87 S4 auto tranny?
06-25-2009, 02:32 PM
#31
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Greg,
If I were a betting man, I'd place my money on government regulations influence...just ask your Vette buddies about the 1st to 4th shift gate. I know for a fact that was to meet some regulations because my brother in law was in charge of the C5 exhaust system design. I remember him telling me this allowed them to pass a noise test as well as assisting with fuel economy/emission tests.
If I were a betting man, I'd place my money on government regulations influence...just ask your Vette buddies about the 1st to 4th shift gate. I know for a fact that was to meet some regulations because my brother in law was in charge of the C5 exhaust system design. I remember him telling me this allowed them to pass a noise test as well as assisting with fuel economy/emission tests.
I could be wrong about it, still sucks.
On the corvette it is easy to fix, the 928, not so much for me any way.
06-25-2009, 03:43 PM
#32
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If I want a first gear start in my 928, I just put the gear selector in "2". Is there really that much of a demand or desire for a first gear start valve body modification? Might be time to start looking into offering that as a service for others if there is.
06-25-2009, 03:53 PM
#33
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We tried moving the spring around, it did not change anything.
Do you know what mods need to be made?
Do you know what mods need to be made?
A first gear start requires a modification in the valve body.
Mercedes. I kind of wonder if part of it may have been a safety issue. Starting out in first gear with a car that makes a good bit of torque down low may not be a good thing in slippery road conditions. Mercedes used the second gear start in their cars with the higher power, while a first gear start was used on at least some of their turbo diesels. With the lag and lack of bottom end on those cars, they needed all the help that they could get off the line.
If I want a first gear start in my 928, I just put the gear selector in "2". Is there really that much of a demand or desire for a first gear start valve body modification? Might be time to start looking into offering that as a service for others if there is.
Mercedes. I kind of wonder if part of it may have been a safety issue. Starting out in first gear with a car that makes a good bit of torque down low may not be a good thing in slippery road conditions. Mercedes used the second gear start in their cars with the higher power, while a first gear start was used on at least some of their turbo diesels. With the lag and lack of bottom end on those cars, they needed all the help that they could get off the line.
If I want a first gear start in my 928, I just put the gear selector in "2". Is there really that much of a demand or desire for a first gear start valve body modification? Might be time to start looking into offering that as a service for others if there is.
06-25-2009, 04:16 PM
#34
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I don't think I'd want 1st gear starts ALL the time. There are times when it's practical to have it start out in 2nd. Dropping it to "2" to get a 1st gear start isn't all that bad.
06-26-2009, 02:58 AM
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This car is my not my DD'er so starting in first will be a major plus for me. When I drive this car I want to scare the crap out of my wife so that will only help the situation! Especially for a supercharged car, the piece of mind know that your transmission can handle the power would be worth it. Do you think the increase in power from the supercharger contributed to the demise of your stock trans? If so, that tells you right there where you need to get the trans rebuilt.
