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my friend has an 86.5 supra na 5 speed. and i have an 89 na i converted it to turbo and 5 speed. at 35 mph in 3rd gear he was at 2250 rpms and when i was at 35 mph in 3rd gear i was at 2500 rpms. i just replaced the clutch in my car so its not slipping. i thought all na's were 4.30's. why would he be at lower rpms then me?
 

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stroked_7m said:
my friend has an 86.5 supra na 5 speed. and i have an 89 na i converted it to turbo and 5 speed. at 35 mph in 3rd gear he was at 2250 rpms and when i was at 35 mph in 3rd gear i was at 2500 rpms. i just replaced the clutch in my car so its not slipping. i thought all na's were 4.30's. why would he be at lower rpms then me?
N/A's don't all have the same diffs i don't think, the sport package got the turbo lsd i believe, and the turbo lsd went from 3.7 to 3.9 between 88 and 89 so i would think that would also apply to the N/A sport package lsd's. im not sure about all of this so correct me if im wrong.
 

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91supraT said:
N/A's don't all have the same diffs i don't think, the sport package got the turbo lsd i believe, and the turbo lsd went from 3.7 to 3.9 between 88 and 89 so i would think that would also apply to the N/A sport package lsd's. im not sure about all of this so correct me if im wrong.

Im pretty sure thats why, so 91supraT could be correct. and you both probably have the W58 unless you used the R154
 

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Ok for those that don't like following links:


'86.5-'92 MA70 N/A MKIIIs without Sport Package have a 4.30, open differential.

'86.5-'92 MA70 N/A MKIIIs with Sport Package (TEMS & headlight washers on '86.5 - '88 : TEMS & PPS on '89-'92) have a 4.30, clutch-pack LSD differential.
 

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could it be because of tire size and rims? im not sure if it could make that much of a differance
 

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toyota_supra_1988 said:
could it be because of tire size and rims? im not sure if it could make that much of a differance

The speedometer should still show the same reading as before, the road speed would just be different.

The stock tach and speedometer aren't 100% accurate. I'd guess the difference is probably from those items (especially the stock tach)
 
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