mileage difference between l3 si and dx tranny?

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Old Jul 15, 2002 | 07:19 AM
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Default mileage difference between l3 si and dx tranny?

anyone know about how much my mileage will drop going to an si tranny from a dx tranny?
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Old Jul 15, 2002 | 03:53 PM
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Default Re: mileage difference between l3 si and dx tranny? (serious)

anyone? someone how's gone from dx to si?
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Old Jul 15, 2002 | 03:57 PM
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Default Re: mileage difference between l3 si and dx tranny? (serious)

not as bad as you think, only problem it it revs a lil high on the free way
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Old Jul 15, 2002 | 04:24 PM
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Default Re: mileage difference between l3 si and dx tranny?

I can't stand how high my rpm's are on the highway. I couldnt imagine how bad it would be if i had a "racing" exhaust.
60mph at 3000rpms. 80mph at 4000rpms.
I would see if you could get a tranny shop to put the dx final gear into the si tranny, that is if you do alot of highway driving. I think at 70mph the dx is at 3000rpms or a tad bit more.
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Old Jul 15, 2002 | 04:30 PM
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Default Re: mileage difference between l3 si and dx tranny? (blacksoul)

80mph it 3850-3900rpm. im fully gutted and its loud but you get used to it real quick
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Old Jul 15, 2002 | 06:16 PM
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Default Re: mileage difference between l3 si and dx tranny? (TorteX)

so if i do a lot of highway driving i should probably stick with my dx tranny?

how much better is the si performance-wise?


[Modified by serious, 7:16 PM 7/15/2002]
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Old Jul 15, 2002 | 06:30 PM
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Default Re: mileage difference between l3 si and dx tranny? (blacksoul)

I would see if you could get a tranny shop to put the dx final gear into the si tranny, that is if you do alot of highway driving.
That would be the same as a DX tranny. The Si and DX have identical gears. The only difference is the final drive. If you are that worried about highway rpm's go with an HF 5th gear in the Si tranny. That would put you at about 2600 rpm's at 60 and 3500 at 80.


[Modified by wronghand, 10:31 PM 7/15/2002]
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Old Jul 15, 2002 | 08:19 PM
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Default Re: mileage difference between l3 si and dx tranny? (wronghand)

try the 4speed **** tranny! 4000 at 80.5000 at 100. 5900-6000 at 120. i dont like it!!!!!!!!!
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Old Jul 16, 2002 | 03:08 AM
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Default Re: mileage difference between l3 si and dx tranny? (serious)

you keeping the DX motor????

I'm the guru, all else are clueless.
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Old Jul 16, 2002 | 03:17 AM
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Default Re: mileage difference between l3 si and dx tranny? (Mista Bone)

nope, i'm swapping in a d16z6, and now i'm just trying to decide which tranny to go with. i thing is i put about 20,000 on my car each year, oh which about half are highway miles.
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Old Jul 16, 2002 | 04:51 AM
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Default Re: mileage difference between l3 si and dx tranny? (serious)

Z6 motor gets the L3 Si tranny.

With the Z6 motor, the Si will give about 2.5-3 mpg more due to the powerband.
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Old Jul 16, 2002 | 06:16 AM
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Default Re: mileage difference between l3 si and dx tranny? (Mista Bone)

you the man. this'll work out better than i thought.
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Old Jul 16, 2002 | 01:01 PM
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Default Re: mileage difference between l3 si and dx tranny? (serious)

an HF 5th gear might work as well. just a thought and not for everyone.
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Old Jul 16, 2002 | 05:38 PM
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Default Re: mileage difference between l3 si and dx tranny? (wronghand)

I would see if you could get a tranny shop to put the dx final gear into the si tranny, that is if you do alot of highway driving.[/B]

That would be the same as a DX tranny. The Si and DX have identical gears. The only difference is the final drive. If you are that worried about highway rpm's go with an HF 5th gear in the Si tranny. That would put you at about 2600 rpm's at 60 and 3500 at 80.


[Modified by wronghand, 10:31 PM 7/15/2002]
wronghand is right.
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Old Jul 17, 2002 | 03:31 AM
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Default Re: mileage difference between l3 si and dx tranny? (MiniSiCRX)

and with the HF 5th gear you'll LOOSE gas mileage also.
Tested it years ago.
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