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Old 08-25-2005, 11:00 AM   #8 (permalink)
avro206
2.4 Liter SIDI ECOTEC
 
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Join Date: Jan 2004
Posts: 422
Re: Upgrading from a turbo 350 to a turbo 700

Quote:
Originally Posted by nailhead425
Not true. The correct gears w/ a TH350 will generate better acceleration because the spacing between first and second gears is closer.

A 700 will pop you off the line faster, but unless you have a very strong low-end pull, it will fall flat on the 1-2 shift. The reason the 700 has a 3.06:1 first was to give the feeling of a strong engine, with one that had very little torque.

The mileage difference between his 350C (lockup) and a 700 aren't as great as you might believe. Plus, 700s are weak.

not true.

Yes there is a more pronounced 1-2 rpm drop but it won't matter that much because you'll be so far ahead due to the stronger off the line. As for mileage---a 30% drop in rpms will give better mileage period. 1:1 to 0.70.
Lower rpms = better mileage.

Better tell GM to drop the 4 speed autos and go back the dark ages!

Early 700R4s were not that strong but after 87-88 they are. Besides if he's putting it behind a realtively stock engine there won't be any problems.
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