235/45/17's on 17x7's

[jtmcinder]

Edit: back on soild ground now ... is the speedo issue related to the change to the secondary gear and transfer case ... ?

- Jtoby

 

[Slow99x]

Yes, I know that they changed because I lost a transfer case to a tailshaft leak and we tried to install just another 23 spline t-case. That one blew up within a month. I called and talked to Shep and this is where he told me that the final drive in a 97-99 was different from earlier AWDs and I needed to match my 99 trans with a 97-99 t-case. Again, could this be a factor in how the speedo reads due to tire size since all 97-99 came with 17" wheels?

 

[jtmcinder]

Edit: interesting. What, exactly, blew up? There's been a lot of talk about how much of a difference the VC can handle. The ratio of 1.090 to 1.074 would suggest that it can't take much of a difference at all, if the VC was involved in the failure.

Of course, there's a tiny torque bias to the rear built into all 2Gs. Yes, it's tiny, but if you work it out, the final drive ratio to the rear is slightly higher than that to the front. And putting a 1.090:1 transfer case on a car that should have had a 1.074:1 would make this difference even larger. Is that would you believe caused your failure?

- Jtoby

 

[steel_3d]

For reference, CAPS states a single speedo driven gear part number for all fwd 2g's (D32A): MD746492.
For awd's there's two part numbers due to the difference in final drive ratios pre and post 97.

 

[Slow99x]

Edit: interesting. What, exactly, blew up? There's been a lot of talk about how much of a difference the VC can handle. The ratio of 1.090 to 1.074 would suggest that it can't take much of a difference at all, if the VC was involved in the failure.

Of course, there's a tiny torque bias to the rear built into all 2Gs. Yes, it's tiny, but if you work it out, the final drive ratio to the rear is slightly higher than that to the front. And putting a 1.090:1 transfer case on a car that should have had a 1.074:1 would make this difference even larger. Is that would you believe caused your failure?

- Jtoby

This is what I was told happend by Shep. He told me that he has seen a rear diff catch fire due to different ratios. Isn't the speedo electronic on a 2g?

 

[steel_3d]

Yes, it is. But it still uses a little plastic gear driven by the front diff, just like 1g's.

 

[Slow99x]

Now being that it is electronic wouldn't it be more sensitive to changes in tire size?

 

[steel_3d]

Why do you say that?
What are we talking about again?...
I just offered up the info that mitsu never changed the speedo gearing, as someone suggested they might have done given that they sold the cars with different height tires.

Carry on with the tire thread...

 

[2GeNTSi]

You can run 225's on 16's, I'm running them right now but I made the decision about two years ago to do that. They are Falken Ziex-512 225/50's. I honestly don't drive hard so I can't really say how they compare to stock. In just straight-line acceleration it'll just spin through first gear though without launching.