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Nismo 320km Dash R33 - suit auto?

oor33sky_
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oor33sky_ Rising Star

oor33sky_

Posted
Posted

Have been thinking of buying a Nismo 320km dash for my R33 GTSt.

Only problem is as it's an auto, will this affect the workings of the dash etc? apart from the obvious of losing the PRND21 dash display?

Any info on this would be much apprectiated.

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https://www.sau.com.au/forums/topic/72918-nismo-320km-dash-r33-suit-auto/
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  • 3 weeks later...
Iceduck312 Collaborator

Iceduck312

Posted
Posted

Hey Guys,

I've just ordered one from Nengun, just wondering what would the top speed be if I installed POWER FC to override 180Km/h Cut off?

What's the highest you guys have gone in urs?

And did a normal autoelectrician install it or did u do it urselves?

Cheers

Iceduck

siksII Grand Master

siksII

Posted
Posted

i know for a fact a speedo from an automatic r33 will read very low when used in the dash of a manual r33. i believe this is due to a difference in the speedo sender in manuals/autos.

so if you install a speedo that is meant for a manual i am quite sure it will read very high.

Apexi R33 Explorer

Apexi R33

Posted
Posted

it's not the diff ratio. it's difference in the speedo sender in manuals/autos in the gearbox

so if you get an 320km speedo from a manual and put in ya auto it'll only read about half of the speed of what you are actually doing. eg: if you are going 60k it will only read about 30k or less

siksII Grand Master

siksII

Posted
Posted
it's not the diff ratio. it's difference in the speedo sender in manuals/autos in the gearbox

so if you get an 320km speedo from a manual and put in ya auto it'll only read about half of the speed of what you are actually doing. eg: if you are going 60k it will only read about 30k or less

apexir33 is spot on, as far as i have found the difference is due to the speedo sender. and it will read about half or double (depending on which mismatch it is)

rs73 Grand Master

rs73

Posted
Posted

Hm, when I'm doing 100 on my speedo, it is actually 91 according to the speed check LCD on Princes Hwy from Geelong to Melbourne. Mine is converted auto with stock manual gearbox and retaining the auto's 4.3 diff. Based on your argument, it's not half, it's only about 5%. I think a factory manual R33 with 4.11 when cruising along at 100, it will show around 96 or 97 on the same Geelong speed check display.

rs73 Grand Master

rs73

Posted
Posted
speedo sender in manuals/autos in the gearbox

Sorry, I missed this.. if the speed sender is in the gearbox, then yes, you're right then... because my gearbox is now manual, the manual speed sender should be in the gearbox when I converted it, and I have a manual, 300kph nismo speedo. It was still the same case with stock manual speedo, 5% less, which is contributed to the different diff ratio.

yaf28f Rising Star

yaf28f

Posted
Posted
Sorry, I missed this.. if the speed sender is in the gearbox, then yes, you're right then... because my gearbox is now manual, the manual speed sender should be in the gearbox when I converted it, and I have a manual, 300kph nismo speedo. It was still the same case with stock manual speedo, 5% less, which is contributed to the different diff ratio.

I have a 320KMPH nismo speedo on my R32 GTR 2 speed manual and an apexi multichecker.

when I'm going 120 on the speedo the multichecker reads only 111 ish. but the speedo feels more right. Is there a way to check which one is more correct?

Also I read that a stock R32 GTR can get up to 250kmph max, is this a gearing issue? I've been over 200 and it's not that close to the redline.

pkblade Experienced

pkblade

Posted
Posted

When changing wheel sizes we know it can put the speedo a bit out of wack & I've heard this can be corrected by either changing the sizes of the trans gear or driven/ speedo gear to which the speedo cable is attached to. This will change the rate the speed is read; there were ratios to work out which size gears to use but that part went over my head. So, not sure if similar concept could be applied here.

Anyways, I thought an auto electrician should be able to recalibrate the manual speedo cluster to fit an auto to give correct reading.

rs73 Grand Master

rs73

Posted
Posted
Also I read that a stock R32 GTR can get up to 250kmph max, is this a gearing issue? I've been over 200 and it's not that close to the redline.

Gearing plays a part, then traction loss, and as well as aerodynamic drag... All this making achieving 250 possible top speed seems forever, best done on a very long straight like the Motor's top speed test in Avalon Airport or car testing oval circuit with cambered corner? An R34 GTR with 6 speed makes it possible to achieve more 250km/h Motor magazine I think had a modified R33 GTR achieving close to 300km/h

yaf28f Rising Star

yaf28f

Posted
Posted

Thanks for the Info. So it is actually not a redline redline limit that dictates the top speed.

There for if the environment was right, eg, very straight road/track and you decided to test your top speed, it won't hurt your engine as much as using a car for drag.?

Gearing plays a part, then traction loss, and as well as aerodynamic drag... All this making achieving 250 possible top speed seems forever, best done on a very long straight like the Motor's top speed test in Avalon Airport or car testing oval circuit with cambered corner? An R34 GTR with 6 speed makes it possible to achieve more 250km/h Motor magazine I think had a modified R33 GTR achieving close to 300km/h
rs73 Grand Master

rs73

Posted
Posted

Well provided you didn't slam your gears to get there as fast as possible (like in drag racing) I suppose it will be more gentle on your engine and gearbox. However prolonged high revs to achive that top speed (e.g. 6000rpm in 5th) may possibly do some bad things to your engine/tranny, especially if the car is not in top condition.

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