i picked up a si tranny and put it in my car this week along with a new exedy clutch. i finally got done today and went to drive it, but it doesnt pull like i thought it would. what rpms should i be turning in 5th gear at 70 mph? the car is doing 3400-3500 rpms at 70 in 5th. i think i may have gotten screwed and gotten a dx transmission! how many rpms should it be doing if its a si @ 70. thanks

 

what size wheels and tires do you have for example....185/60/14

 

well i checked with 185/60/14 it should be at 3390 so you are good its a si tranny

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Bserieskllr &raquo;</TD></TR><TR><TD CLASS="quote">what size wheels and tires do you have for example....185/60/14</TD></TR></TABLE>
Doesn't really matter since the VSS is in the tranny. Wheel size only matters when you're dealing with actual ground speed, not the speed indicated by the gauge cluster.

When the speedo is reading 70mph, with an Si transmission the tach should be reading 3400 RPM and with a DX transmission it should be reading 3100 RPM.

You have an Si tranny.

 

i have 13" wheels. the car doesnt feel like it pulls any harder to me than it did wiht my dx tranny. at about 81-82 mph it turns about 4000 rpms

 

You definitely have an Si tranny.

There isn't an insanely huge difference between the two; all the gear ratios are the same except for the final drive - the Si FD (4.25:1) is 9.5% shorter than the DX FD (3.88:1) so each gear should feel just a little quicker.

D-series transmissions really aren't short at all. The Si tranny is about equivalent to a B-series "LS" tranny in terms of gearing, which is crappy. The Si tranny is as good as you can get for a D-series though without resorting to hybrid gearing (i.e. ZC gears with an Si FD) or an aftermarket final drive (i.e. ATS 4.73:1).

Or you could just go B-series, have a shorter tranny AND more power.

 

well atleast i know that its really a Si, i thought it felt a little stronger but i also thought maybe it was the new clutch because my old one was ****! lol, but i think maybe i expected it to be geared like a b16 tranny or something. im just glad its really a Si tranny and i didnt get duped because its a pita to take out lol

thanks

 

my DX did 3200 on 75mph
the SI does 3600 on 75mph

 

I just bougt my 2nd si... I think when i'm going 70pmh I'm at like 3200-3300rpms....


how do i know if my tach is still accurate?..... it has like 213k on the car... could the cable vss be in accurate?

 

just to clarify, it is indeed a Si tranny and i didnt get screwed

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Charlie Moua &raquo;</TD></TR><TR><TD CLASS="quote">I just bougt my 2nd si... I think when i'm going 70pmh I'm at like 3200-3300rpms....


how do i know if my tach is still accurate?..... it has like 213k on the car... could the cable vss be in accurate?</TD></TR></TABLE>

WTF... dude i was testing it out yesterday and the tach was only at 3200rpm going 70mph.
this is a bone stock EF.... (14" steelies and regular tires)


how to check if i really do have asi o dx tranny? is there a code?

 

yea there is a casting number on the tranny near the passenger axle. its a small circle.. if i remember correctly my si reads pl3 over 3000, whereas on my dx the bottom number started with an "a". it may be that if your using a stock tach that it could be off 2-300 rpms.. im using aftermarket tach