There has been quite a bit of discussion about the 4.23 and the EPS system as of late. I have spend a lot of time researching this topic, and although there does appear to be one car that has had an issue with this, I suspect it is isolated.
If you go here:
http://www.supercarsite.net/honda_nsx-r.htm you will see in the specifications the 2002 NSX-R has EPS with the 4.23. But.... other sources say it has manual steering. After hours of discussions about this with many of the tech folks, including Mark Basch who has done more 4.23 installs then anyone, my own research, and the fact as John mentioned, his is working fine (EPS and 4.23) I have concluded this should not be an issue.
The fact is I did some very careful shimming of the EPS speed sensor for John's installation. I DID NOT use the shim specified for the 4.55. The sensor is a "proximity" sensor and the clearance is critical and also the specification is not available, AFAIK. Typically the clearance is based on the case machining when the car has the 4.06.
So at this point, until I perform the 4.23 install in Ryan's 2005 I suggest we all wait.
The last phase of Ryans's project is the 4.23 install with NSX-R mainshaft and dual plate Centerforce clutch to handle his SC
. This will bring the car as close as possible to the true NSX-R theme, and meet his own personal requirements.
Over the next few weeks this will happen, based on the weather, since it is totally white here right now
. I will keep you posted.
Regards,
LarryB