DD,
Its also important to note the s15 silvias didn't come with a speed sensor on their gearboxes.their speed sensors are located in their diffs.and in some cases,their casing doesn't have a plug for custom vss if u decide to open up box.This could prove to be a challenge to get right in a datto behind a-series and stock datsun tacho according to statements quoted below.
Quote:
Speed Sensor Calibration:
Although some S15 boxes have a hole for a speed sensor, there exists no gears to drive one. For this reason, installing an S15 differential is easiest, unless you want to tear apart the S15 box to install the plastic gear needed for the task. Not worth it imo.
If using the S15 diff, the signal must be reduced by a factor of 4 using a calibration unit. A basic 'touchup' speedometer calibrator such as the Jaycar unit will NOT achieve this (although I met a guy who ran three in series, which is not recommended). I use this to amplify the 5-speed signal being sent to my S15 cluster, and it works for reductions too:
http://www.gpsspeed....calibrator.html
Please note that a reduced signal must be supplied to the S13 ECU and S13 cluster, so if you install an S15 cluster, you must still modify the signal to the ECU.
Also, the signal of the S15 speed sensor is normally converted to a square wave (rather than a sine wave) by the S15 ABS computer before it's fed to the S15 ECU and cluster. I don't expect this to be an issue, however should you encounter problems, it's something to keep in mind.
alot of forums tend to state the s15 6speed isn't as strong or doesn't handle well as much punishment as the s13 dets gearboxes.don't quote me on that as fact.but not that it will matter behind an a-series.
the rb20det fs5w71c gearbox shares the same internals as s13 sr20det gearbox while being a shorter gearbox.from some sites, they say difference is rb20det 2nd gear is longer geared.
and generally s15 gearboxes are more expensive than say rb20det gearbox.
D,
the welds are really well done as you would expect of japan's workmanship.
Transfer
