need auto trans swap tech
#1
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need auto trans swap tech
First, I'm not going to do this. I do need to know what it takes though in order to see if it would go outside the rules of SCCA B Street Prepared, which I suspect it would.
[short story] Using only parts found on C4s, can you make a slushbox work behind an LT5? I know the dual mass flywheel is specific to LT5, and the ZF input shaft is large. These lead me to these issues:
- is the bell housing bolt pattern LT5 specific?
- pilot bushing: can the small shaft bushing fit in the LT5 crank?
- crank bolt pattern: is it the same as L98/LT1/LT4?
- flywheel/flexplate balance: is the LT5 a different balance weight?
- starter gear, given the unusual mounting is the flywheel ring gear unique?
- trans availability - is the "regular" c4 automatic up to the output of LT5 without modification?
[/short story]
[back story] Right now the ZR-1 and other C4s are segregated from each other. This means you cannot swap parts between them, keeping some useful bits off the ZR-1. I am engaged in trying to combine them so a few useful bits can be used, trying to level the treatment with LT4 (which can use all those bits). There is a concern if combined that making the automatic available to ZR-1 could create a class killer.
[/back story]
I have my doubts the swap could be accomplished without going beyond the *SP rules. This is a current issue as I'm hoping to get this classing done before it's too late.
I think the ZR-1 could make a nice Street Prepared car, which allows some weight reduction, exhaust, tune, springs etc. But I think it really needs the quick ratio steering rack from the early Z51 cars, and to get this I need to get the rules updated. I think they were scared of the ZR-1 back in the day .
Here's where I confess to being an old Ford guy and basically clueless at this level of Bowtie tech.
Thanks in advance,
- Jeff
[short story] Using only parts found on C4s, can you make a slushbox work behind an LT5? I know the dual mass flywheel is specific to LT5, and the ZF input shaft is large. These lead me to these issues:
- is the bell housing bolt pattern LT5 specific?
- pilot bushing: can the small shaft bushing fit in the LT5 crank?
- crank bolt pattern: is it the same as L98/LT1/LT4?
- flywheel/flexplate balance: is the LT5 a different balance weight?
- starter gear, given the unusual mounting is the flywheel ring gear unique?
- trans availability - is the "regular" c4 automatic up to the output of LT5 without modification?
[/short story]
[back story] Right now the ZR-1 and other C4s are segregated from each other. This means you cannot swap parts between them, keeping some useful bits off the ZR-1. I am engaged in trying to combine them so a few useful bits can be used, trying to level the treatment with LT4 (which can use all those bits). There is a concern if combined that making the automatic available to ZR-1 could create a class killer.
[/back story]
I have my doubts the swap could be accomplished without going beyond the *SP rules. This is a current issue as I'm hoping to get this classing done before it's too late.
I think the ZR-1 could make a nice Street Prepared car, which allows some weight reduction, exhaust, tune, springs etc. But I think it really needs the quick ratio steering rack from the early Z51 cars, and to get this I need to get the rules updated. I think they were scared of the ZR-1 back in the day .
Here's where I confess to being an old Ford guy and basically clueless at this level of Bowtie tech.
Thanks in advance,
- Jeff
#2
NCM Lifetime # 982
Pete from Chicago has done the conversion more than once. He may pop up and answer your questions. Or you can track him down easier on the ZR1 forum.
#3
Race Director
I have seen his work, can it be done with all C4 parts?? I would say yes
only thing is a C4 Flexplate needs to be redrilled for the LT5 crank
#4
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