1987-1988 turbo question

suprahero

suprahero

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How many rpm's are you turning at 80 mph? There is a guy here locally(junk yard) that has a 1987 supra turbo. He swears the differential is a 3.73. I don't know how he knows this, but he saids he does. I know the 87 and 88s had a 3.90 gear ratio. I have a 91 turbo five speed with a NA differential in it I guess cause it turns 3900 rpm at 80 mph. I'm just wanting to know if this is a regular differential out of a 87 and not the 3.73 like he swears it is, what can I look forward to on the highway. My wifes 89 auto turns 2800 at 80 mph. What does your 87 turn. Thanks.


I don't know how all of that sounds, but my one question is this: How many rpm's are you turning in fifth gear at 80 mph. That's generally what I cruise at and want to know how many rpm's I'll be turning. Thanks
 
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suprahero

suprahero

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I have did numerous searches on here in the last thirty minutes and it seems like the 3.91 would be a better gear ratio for me. I love to go to Bama dragway and race through an 1/8 mile and spank Mustang GT's. It looks like the only real benefit of the 3.73 is twenty miles an hour faster on top end. I have no desire to go over 140mph., so that wouldn't concern me. Does this make sense and is it an accurate analysis? Thanks.
 
sleepersupra

sleepersupra

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Nov 5, 2005
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ok well i don't remember what mine turns at 80 but mine is stock rearend and i wanna say it's around 3500??? i don't know though. i just felt like you needed somekind of answer. and i believe that mine has 3.90's
 
suprahero

suprahero

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Thanks sleepersupra. I was hoping for a little less than 3500, but I guess that's what I'll get if I buy this one from the junkyard. Hopefully someone else will chime in and lie to me and tell me it'll be right around 3000..............lol

rep sent. thanks
 
suprahero

suprahero

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Apparently I have given you all rep recently, cause it won't let me do it again. I did however give rep to Micky. I really do appreciate the help and 3100 is awesome. I will go buy the rearend tomorrow. I think 140 kilo. is around 80mph. My dash has kilometers on it where I ordered my gauges wrong. All I know is 80mph is straight up like 12:00. You've all been a great help.

Glad I could give you a reason to go cruisin at 80 SS.............lol

OH, yeah ,I have 17" wheels also, I can't remember what size tire though. Their low profile, so their probably not much bigger than stock 16" wheels and tires.
 
mickyg

mickyg

7MGE MX-73
Sep 15, 2005
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suprahero said:
Apparently I have given you all rep recently, cause it won't let me do it again. I did however give rep to Micky.
Click to expand...

Thanks! First I've gotten I think!

EDIT:
Nope, just an SM n00b! I didn't know how to look that info up. Apparently you're the third!
 
sleepersupra

sleepersupra

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suprahero said:
Glad I could give you a reason to go cruisin at 80 SS.............lol

OH, yeah ,I have 17" wheels also, I can't remember what size tire though. Their low profile, so their probably not much bigger than stock 16" wheels and tires.
Click to expand...

no problem man and mine are 17's with 235/45
 
suprahero

suprahero

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I think you have to have enough horses to get to 6500 rpm in fifth. I don't think I'll ever find out. Our roads aren't the best around here, and that would eat a set of brakes up, trying to stop quick from 165.
 
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