Sustained high speeds

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Mar 17, 2008 | 04:34 PM

#11

ride_maine

1st Gear Member

Joined: Mar 2006

Posts: 82

From:

RE: Sustained high speeds

Why turn that many rpm's if you dont have too? Gears are a cheap way to insure your new, expensive shortblock will last a long time. WIth the kb especially, you'll have more than enough power to chug along at 120 at only 3 grand. Take everyones advice, and good luck on the project.

Mar 17, 2008 | 11:18 PM

#12

Ehmark

Thread Starter

3rd Gear Member

Joined: Mar 2007

Posts: 891

From: Ca

RE: Sustained high speeds

Thanks for the advice guys In a year or so Ill tell you all how it goes; )

Mar 18, 2008 | 09:42 AM

#13

RuffCat

3rd Gear Member

Joined: Jan 2008

Posts: 609

RE: Sustained high speeds

Quote:

ORIGINAL: Ehmark

I am not going to have to be at 120 for too long as Ive figured out .A friend of mine has actually done it before and he says I have to average about 95 to win for the class I want to enter I do not have the prerequisites to do any of the other groups. I will only have to be at really high speeds for only a few minutes to componsate for the narrows.120 is at just under 5000 revs with my current transmission and with the t56 It should be closer to 4000 rpms.That should be in the acceptable range with a good radiator and the EVEN FLOW right?

You will be at 4600rpms with the T45 in 5th gear and 120mph. The T56 will drop you a litle over 300rpms, not 1,000rpms like you think. You will be at 4250rpms or so with the T56. The reason for this is because the T45 has a .68 overdive gear and the T56 only has a .62 overdrive gear for 6th. Not that much difference. The T56 makes you just shift faster which is what people do not realize. It does give you that little bit of drop in roms though, but not really enough to show for. For the average speed of 95mph with your set-up will run you at 3650rpms