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75 Vette Automactic Change
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pp52
I watched Corvette Summer
| Posts: 2
| Joined: 09/09
Posted: 09/08/09
01:50 PM
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I want to replace turbo 400 auto trans with a 4 speed or 5 speed automatic. Car has a 338 stoker 440 hp, turbo 400 auto and 307 rear end.. Attempting to be able to get performance with better fuel mileage.. Choices are either cahnge rear end to a 370 or better or transmission. Comments please.
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waynep7122
Duntov Incarnate
| Posts: 212
| Joined: 08/09
Posted: 09/08/09
07:21 PM
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there are several 4 speed options...
200R4... yes... those... but with proper modifications... they can handle your power... and even more...
700R4/4l60... they need the same amount of modifications...
i just don't think that a 4L80E will fit in your drive shaft tunnel..
which carb do you have???? have you an air fuel ratio meter???? to see if the carb is tuned properly...
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pp52
I watched Corvette Summer
| Posts: 2
| Joined: 09/09
Posted: 09/10/09
12:39 PM
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I have a Holley 750 cfm on right now. I don't have a air fuel ratio meter so my guess is it is close to tuned properly but only a shade tree guess. I have considered the Eledbrock 750.. they more streetable; however the Holley when set right is a great carb.
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waynep7122
Duntov Incarnate
| Posts: 212
| Joined: 08/09
Posted: 09/10/09
06:51 PM
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there is one thing... what is your current cruising rpms.... where you drive for mile after mile while holding your foot steady...
when you drop to a fairly low rpm with a carb... the carb mostly runs on the idle transition ports.. there really is not enough air moving across the primary booster venturi to really make fuel mileage...
with fuel injection.. the injectors just spray less fuel.. but the carb... it used the speed of the air to pull the fuel up and over from the various circuits... idle, transition, high speed,
there are thousands of different ways to ***
do you have any smaller carbs ???? that you could drop on and do some tuning???
you might talk to california performance transmissions down in huntington beach... they do the 200R4s that will handle most engines.. they will have some great info...
you really might check out the various air fuel ratio meters... they start at 40 bucks.. plus an ordinary oxygen sensor.. wide band digital versions are a lot more..
i don't know if you have ever seen any of the prototype cars making their cross country runs... with back seats full of recorders... measuring everything.. so... plan on buying some 21 century equipment to help you tune your motor...
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