pros? cons? 4.30gears ........

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Mar 14, 2005 | 05:53 PM

#26

Julian

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From: Longview, Texas

That was Racing Beats first year run for the FD ... The car was FAR from stock.

Quote:

Originally Posted by enigma662

Over 170 could be crazy... I heard of an RX-7 flipping at 190 while going for a high speed run on the salt flats. Gotta look at aerodynamics...

Mar 14, 2005 | 05:56 PM

#27

apex_sideway

FD dream is dead

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From: FL

Thanks

Mar 14, 2005 | 07:23 PM

#28

FDNewbie

Sponsor

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From: Tampa, FL

Quote:

Originally Posted by Julian

You will need over 400 rwHp

Yea I know...shouldn't be a problem. I'm working on it

Mar 14, 2005 | 07:36 PM

#29

pianoprodigy

Missin' my FD

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From: Seminole, FL (Tampa Bay Area)

Quote:

Originally Posted by darkphantom

that 3.9 is great for the highway.

As in gas mileage?

Otherwise, it would be a huge waste unless you have an LS? under the hood.

Mar 14, 2005 | 11:36 PM

#30

lane_change

It has begun

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From: Houston, TX

Quote:

Originally Posted by pianoprodigy

No it doesn't mess up the speedometer. If your tire height is taller/shorter than stock, you can mess up your speedo because you are effectively changing the gear ratio.

I have 4.77 gears and my Speedo is way off. I am running 285-30-18's, which are only 1/10" shorter overall height than the stock 225-50-16's. I don't understand how you said the lower gear ratio will not affect the speedometer?

Mar 15, 2005 | 12:06 AM

#31

pianoprodigy

Missin' my FD

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From: Seminole, FL (Tampa Bay Area)

Quote:

Originally Posted by lane_change

Perhaps my understanding of how the speedo works is wrong then. Rather than me try to explain my reasoning and possibly spread misinformation, could someone who knows please explain how the FD's speedo determines speed?

Mar 15, 2005 | 03:31 PM

#32

apex_sideway

FD dream is dead

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From: FL

Yeah ^ that's what i thought. Is there anyway around this lane_change? Like a aftermarket rev/speed meter (apex-i) ?

Mar 15, 2005 | 03:38 PM

#33

pianoprodigy

Missin' my FD

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From: Seminole, FL (Tampa Bay Area)

Quote:

Originally Posted by apex_sideway

Yeah ^ that's what i thought. Is there anyway around this lane_change? Like a aftermarket rev/speed meter (apex-i) ?

Still waiting for an explanation for WHY I might be wrong and not just an assumption...

Mar 15, 2005 | 03:44 PM

#34

saxyman990

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From: Dayton, OH

Because the speedo gets its signal from the tranny speed. Altering the rear gear (this includes changing overall tire diameter) will effect the rotational speed of the transmission.

Mar 15, 2005 | 03:57 PM

#35

pianoprodigy

Missin' my FD

Joined: Aug 2002

Posts: 1,755

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From: Seminole, FL (Tampa Bay Area)

Quote:

Originally Posted by saxyman990

Because the speedo gets its signal from the tranny speed. Altering the rear gear (this includes changing overall tire diameter) will effect the rotational speed of the transmission.

I see. So the speed is measured after the transmission and before the rearend? If so, it wouldn't actually affect the rotational speed of the transmission but rather the driveshaft would continue to spin just as it always has and thus the speedo would read the same, but the rear tires would be rotating faster or slower due to a different gear ratio from a tire or final drive change.

Last edited by pianoprodigy; Mar 15, 2005 at 04:03 PM.