DSMPT
DSM Wiseman
- 2,796
- 2,498
- Jun 12, 2014
-
Japan / Mexico,
Arizona
I just wanted to let people in this forum know about this driveshaft. Driveshaft shop state on their site as the driveshaft is for DSM, but it actually comes with a non DSM rear flange. (I guess it is a 3000GT/Stealth flange. The centering pilot diameter is the same as DSM but the flange itself is slightly larger than DSM, with different bolt pattern and M10 bolt holes instead of DSM M8 holes). So if you are planning to order this driveshaft, just note that this driveshaft is not direct bolt-on, if you have a DSM rear diff. It requires some modifications to install.
I reported them that the flange is not for DSM and asked them to replace the flange to a right flange (as I am the one who asked them to list this driveshaft on their site to make it possible to order in January of this year), but they didn't admit it nor cover their fault.
They didn't pay attention to what I was telling them, even I provided infos about DSM rear diff flange. they just kept telling me that the flange they supplied me with the driveshaft is the right one for 1G DSM and "my DSM" has a different flange somehow (I have several 1G rear diffs and all have the same dimension, of course...). also told me that the best way to solve the issue would be drilling my DSM rear diff flange pattern onto the flange they supplied me (to make M8 holes) or drilling the driveshaft flange pattern onto my DSM flange (to make M10 holes). and that is the only flange they have for DSM, EVO and 3000GT. Their flange catalog doesn't have any flange that has the dimension of DSM which I provided...
Installation: (Pics attached)
Actually drilling DSM pattern onto the flange they supplied me (to make M8 holes) was the only choice. Since there won't be enough material left on the edge of DSM flange if drill to make M10 holes.
After you drill M8 holes with DSM pattern onto the flange on the driveshaft, you require to remove the rear diff flange from rear diff and trim the dust cover part to let the bolts pass through from rear diff side to driveshaft side. because you will require to put the bolts from rear side to front side since bolts can't pass through from driveshaft side to rear diff side (original direction) due to contact the u-joint. And also the bolt strength, if you set the bolts as the original direction, only threads part of bolts will remain in rear diff flange due to the thicker flange on the driveshaft.
When you put back the flange to the rear diff, first you set the bolts on the flange and then put the flange back to rear diff. otherwise bolts won't pass through after the flange is installed due to no room. (Maybe replace the drive pinion oil seal at the same time is a good idea, if you have never replaced it)
Review:
I was concerned about vibration because of the difference of angle between t-case and rear diff. and I haven't run in the track yet so it is hard to tell. but with a couple of easy pulls on the street, so far vibration is less than I expected. Actually I didn't notice much difference. maybe because all engine mounts are metal solid and they are already giving me a bit of harsh driving feeling. and I noticed the throttle response is more direct and much quicker than when it had the stock 3 piece driveshaft.
I made a quick comparison of weight. It is scaled by a bath scale, so it is not that accurate.
- 1G Stock driveshaft with carrier bearings : approximately 16.2kg (35.7 lbs)
- Driveshaft Shop 1 piece 3.25" carbon fiber driveshaft : approximately 7.4kg (16.3 lbs)
Impression:
As everyone knows, their product's quality is very high and well made. I am very impressed, happy and have absolutely no doubt about it, but I am not impressed with their after-sales customer support. That should be improved more.
Hope they would realize that their catalog of flange is misinformed, and would revise it ASAP to produce a right flange for DSM to avoid this issue with further customers.
I reported them that the flange is not for DSM and asked them to replace the flange to a right flange (as I am the one who asked them to list this driveshaft on their site to make it possible to order in January of this year), but they didn't admit it nor cover their fault.
They didn't pay attention to what I was telling them, even I provided infos about DSM rear diff flange. they just kept telling me that the flange they supplied me with the driveshaft is the right one for 1G DSM and "my DSM" has a different flange somehow (I have several 1G rear diffs and all have the same dimension, of course...). also told me that the best way to solve the issue would be drilling my DSM rear diff flange pattern onto the flange they supplied me (to make M8 holes) or drilling the driveshaft flange pattern onto my DSM flange (to make M10 holes). and that is the only flange they have for DSM, EVO and 3000GT. Their flange catalog doesn't have any flange that has the dimension of DSM which I provided...
Installation: (Pics attached)
Actually drilling DSM pattern onto the flange they supplied me (to make M8 holes) was the only choice. Since there won't be enough material left on the edge of DSM flange if drill to make M10 holes.
After you drill M8 holes with DSM pattern onto the flange on the driveshaft, you require to remove the rear diff flange from rear diff and trim the dust cover part to let the bolts pass through from rear diff side to driveshaft side. because you will require to put the bolts from rear side to front side since bolts can't pass through from driveshaft side to rear diff side (original direction) due to contact the u-joint. And also the bolt strength, if you set the bolts as the original direction, only threads part of bolts will remain in rear diff flange due to the thicker flange on the driveshaft.
When you put back the flange to the rear diff, first you set the bolts on the flange and then put the flange back to rear diff. otherwise bolts won't pass through after the flange is installed due to no room. (Maybe replace the drive pinion oil seal at the same time is a good idea, if you have never replaced it)
Review:
I was concerned about vibration because of the difference of angle between t-case and rear diff. and I haven't run in the track yet so it is hard to tell. but with a couple of easy pulls on the street, so far vibration is less than I expected. Actually I didn't notice much difference. maybe because all engine mounts are metal solid and they are already giving me a bit of harsh driving feeling. and I noticed the throttle response is more direct and much quicker than when it had the stock 3 piece driveshaft.
I made a quick comparison of weight. It is scaled by a bath scale, so it is not that accurate.
- 1G Stock driveshaft with carrier bearings : approximately 16.2kg (35.7 lbs)
- Driveshaft Shop 1 piece 3.25" carbon fiber driveshaft : approximately 7.4kg (16.3 lbs)
Impression:
As everyone knows, their product's quality is very high and well made. I am very impressed, happy and have absolutely no doubt about it, but I am not impressed with their after-sales customer support. That should be improved more.
Hope they would realize that their catalog of flange is misinformed, and would revise it ASAP to produce a right flange for DSM to avoid this issue with further customers.
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