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Old 03-01-2009, 06:05 AM
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My Z...
Is running close to 4k rpm on the highway? at like 65-70 mph lol

my guess is its not supposed to be running that high... I'm burning through gas like crazy
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Old 03-01-2009, 07:00 AM
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no thats right, i run 80 every day on the interstate at 4.5k, motors still running
Last edited by 280zx2by2; 03-03-2009 at 01:40 PM.
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Old 03-01-2009, 07:28 AM
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with 4 speeds i'm guessing? that's what you get with a 4 speed. my midget would redline at 90mph lol. nice.
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Old 03-01-2009, 08:48 AM
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In my Daily I have the 3 speed auto and I am at 4k rpm doing 80ish. I get 18-19 mpg, I can't wait to get my 5 speed up and running.
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Old 03-01-2009, 09:09 AM
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my 5 speed at 70 is 3K
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Old 03-01-2009, 12:10 PM
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Originally Posted by KasbeKZ
with 4 speeds i'm guessing? that's what you get with a 4 speed. my midget would redline at 90mph lol. nice.
actually a 5 speed with a 3.9 R200, thats if you were talking to me
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Old 03-01-2009, 03:37 PM
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<5 speed 3.90 R180
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Old 03-01-2009, 04:09 PM
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nah mines a 5 sp lol

I just think thats really high considering you don't need a lot of power to keep speed on a highway.
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Old 03-03-2009, 01:40 PM
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Originally Posted by 280zx2by2
no thats right, i run 80 every day on the interstate at 4.5k, motors still running
whoops, i run 3k at 80mph... good thing too... lol
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Old 03-03-2009, 04:51 PM
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Originally Posted by 280zx2by2
whoops, i run 3k at 80mph... good thing too... lol
Not cool, guess I'm gonna have to accelerate then drift on the highway.

stupid gear ratios.


any recommendations?
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Old 03-03-2009, 05:51 PM
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65-70 MPH is approximately 3500 on mine.

5 speed w/ R200
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Old 03-03-2009, 06:45 PM
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Originally Posted by JhnRX7
5 speed w/ R200
I thought NA's came with R180s. Did you do a swap?
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Old 03-03-2009, 07:17 PM
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Originally Posted by User395
I thought NA's came with R180s. Did you do a swap?

81-83 Manual Transmission 3.9 R200

Z Car Transmission & Rear End Gearing
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Old 03-03-2009, 07:20 PM
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280ZX 81-83 Turbo - all (3.545) (R200)

280ZX 81-83 MT (3.9) (R200)

^ From the site you gave me


I have a 83 zxt M/T that makes it a 3.545 (R200), right?
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Old 03-03-2009, 07:46 PM
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correct as long as no one changed the diff out.

http://www.geocities.com/z_design_studio/
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Old 03-03-2009, 07:51 PM
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Originally Posted by JhnRX7
65-70 MPH is approximately 3500 on mine.

5 speed w/ R200
you sure? i did 80 today and just hung there at 3100-3200 rpm, mabe i got something special, or my speedo is off

is their a dif in the BW T5 that came in Manual turbos and the regular NA 5 Speed ratios?

EDIT no yours is NA, idk
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Old 03-03-2009, 08:55 PM
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Yes, the BW T5 gear ratios are a little different, but the O/D is pretty close on both trannies.
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Old 03-04-2009, 12:55 AM
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Originally Posted by 280zx2by2
you sure? i did 80 today and just hung there at 3100-3200 rpm, mabe i got something special, or my speedo is off

is their a dif in the BW T5 that came in Manual turbos and the regular NA 5 Speed ratios?

EDIT no yours is NA, idk
You were probably doing more like 75 at that RPM. I know..because my speedo is off about 5mph after 50mph or so. Because I have gone by people with digital speedometers on the freeway. And they were reading 5 less than mine was.
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Old 03-04-2009, 08:26 AM
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what do I need to do to change it ! its really annoying when I'm going down the highway and my car is screaming
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Old 03-04-2009, 09:57 AM
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would changing to an r200 help? or would it be the same because you said your 180 was a 3.9 and 2by2 said his 200 was a 3.9 too?
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Old 03-09-2009, 08:30 AM
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Originally Posted by JhnRX7
65-70 MPH is approximately 3500 on mine.

5 speed w/ R200

I dont know what I was thinking...

I meant to say 2500 RPM
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Old 03-09-2009, 09:04 AM
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Originally Posted by JhnRX7
I dont know what I was thinking...

I meant to say 2500 RPM
Think mine is too. I was doing 80mph at about 3300rpm on my way to the city...dunno if that's good or not lol
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Old 03-09-2009, 03:19 PM
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Originally Posted by JhnRX7
I dont know what I was thinking...

I meant to say 2500 RPM
lol i did the EXACT same thing
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Old 03-09-2009, 03:40 PM
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Originally Posted by KasbeKZ
would changing to an r200 help? or would it be the same because you said your 180 was a 3.9 and 2by2 said his 200 was a 3.9 too?
180 and 200 refer to the ring gear size in mm

the 3.9 or whatever it is, is the over all ratio

and r200 is just an over all stronger unit than the r180
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