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Potential Top Speed?

gt-ahhh!
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Timeb0mb Enthusiast

Timeb0mb

Posted
Posted
thats a very interesting theory. a bit far fetched perhaps, i see no reason why my car would be an auto convert! are there any cosmetic giveaways?

im very interested to hear your results.

hi,

got the car back on saturday, alot later then i expected, but thats always the case with machanics :wave:

now running standard R33 GTST manual box with Auto diff

i didnt get to test a large rev range as i didnt drive on the motor way over the weekend

however i did get the chance to do:

40kmh at 1000rpm and

80kmh at 2000rpm

id like to test 3000rpm but it does look like it will be 120kmh

agreed the theory was a bit far fetched :bunny: so mayby someone replaced the manual diff with an auto for high speeds

gt-ahhh! Proficient

gt-ahhh!

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agreed the theory was a bit far fetched ;) so mayby someone replaced the manual diff with an auto for high speeds

how bizarre. thanks for your input! i think i may replace the diff down the track, but i guess having taller ratio would be good for highway, but standard ratio would be better for acceleration. im still not convinced my car is abnormal though lol. maybe the speedo is just out a bit haha.

SKYPER Enthusiast

SKYPER

Posted
Posted (edited)

There is a "rolling road" dyno that measures km/h. But is for checking speedo accuracy.

They put a device on the dash which displays speed at the wheels

and compare to speedo speed.

I had my car tested on this dyno. Goes up to 180km/h on the certificate of accuracy.

Edited by SKYPER
  • 1 month later...
Primordial Grand Master

Primordial

Posted
Posted
how bizarre. thanks for your input! i think i may replace the diff down the track, but i guess having taller ratio would be good for highway, but standard ratio would be better for acceleration. im still not convinced my car is abnormal though lol. maybe the speedo is just out a bit haha.

It IS a bit out... at those speeds, definitely. It's a mechanical speedo, and its definitely not meant to be accurate over its 180km/h limit.

AndyD Collaborator

AndyD

Posted
Posted (edited)

My mrs has a series 1 r31 N/A rb30 auto it sits on 2500 rpm at 100km/h but it goes hard of the line so i did some checking the auto came out with a 4.44 diff centre compared to 3.9/4.11 for the manual. So on take off the auto is comparable to a manual but once you get high in the rev range the auto cannot pull back the manual becuase the manual has the lower diff ratio it can pull more km per rpm. Look to the salt lake racers all of them would be running 2.7 diff ratios but it takes them 1.6 km to get up to speed. Rod hadfiled has built a commodore that does over 400km/h it is a salt lake racer has huge hp but its all in the diff ratio rear box ratio and try diameter.

http://www.1010tires.com/TireSizeCalculato...p?action=submit

This is a handy app to use the above to calculate your tyre diameter then fill in the rest this is obviously not concrete but rough guide if you play with it you see the differences in diff ratio and try size play in top speed

http://www.dennysdriveshaft.com/html/poten...calculator.html

Gear ratios can be found here

http://carizma.com.au/Pages/Details%20-%20...e%20-%20R33.htm

Edited by AndyD

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