jerryb Posted November 23, 2007 Share Posted November 23, 2007 Im considering one of three things for my RB20 install. ---Installing Speedo and tach from a RB25 or ---Installing a Stewart Warner Speedo and tach that I picked up real cheap or ---Stay with the mechanical speedo and convert to a skyline Tach Now I understand that the RB tranny runs a mechanical Speedo so I will need to generate a pulse for the electronic speedo to work. I have searched around and have found that Dakota Digital makes this .... http://www.dakotadigital.com/index.cfm/page/ptype=product/product_id=109/category_id=311/home_id=59/mode=prod/prd109.htm As I see it, to make the SW speedo work I ask DD to make an output connector that connects to the RB20 tranny. Wire the pulse generator to the speedo and calibrate it. In all likelihood over simplified but more or less. The RB25 speedo may be another matter...it may work on a different pulse and will unlikely have calibration capabilities. I think I prefer the OEM look over the SW pieces but the SW may be easier with fewer problems. Has anyone used this device? Am I on the right track? What do you think I should do? Quote Link to comment Share on other sites More sharing options...
Evan Purple240zt Posted December 3, 2007 Share Posted December 3, 2007 First off which trans? RB25 AND RB20det trannies will accept a z32 or a 240sx speed sensor. The pulse count is different between the S13 and S14 speed sensors btw. Should be able to program any aftermarket speedo to work with these. I know for a fact that the above statement is true for the rb25 trans because I did it in my 240sx. Evan Quote Link to comment Share on other sites More sharing options...
jerryb Posted December 7, 2007 Author Share Posted December 7, 2007 The RB20 tranny. I will start looking around for a used sensor and try. Sounds much easier.... Thanx!! Quote Link to comment Share on other sites More sharing options...
Evan Purple240zt Posted December 7, 2007 Share Posted December 7, 2007 The RB20 tranny. I will start looking around for a used sensor and try. Sounds much easier.... Thanx!! And much much cheaper! Evan BTW, if you don't have any luck finding one Ill have an extra in a month or so when I put my new trans in. Quote Link to comment Share on other sites More sharing options...
Doug71zt Posted December 13, 2007 Share Posted December 13, 2007 Late Z31 (87-88) have a speed sensor that screws onto the mechanical speedo output on the transmission, they can be found pretty easily. I believe that Clive Eastwood is currently wrecking an 88 Turbo Z31. Doug Quote Link to comment Share on other sites More sharing options...
jerryb Posted December 13, 2007 Author Share Posted December 13, 2007 Clive is wrecking a Z31? Ok I will give hime a call. Thanx Doug! Jerry Quote Link to comment Share on other sites More sharing options...
Careless Posted December 16, 2007 Share Posted December 16, 2007 Clive is wrecking a Z31? Ok I will give hime a call. Thanx Doug! Jerry I actually got emails from Clive to get the Transmission on that Z31 if he has room for it. I would take it but he's in Hamilton. He said he knew someone with an RB engine and said it sat really nice in the engine bay. I think he was talking about yours. You should grab it if you have an RB20 Transmission and you're gonna put some extra kick into it. The engine is out of the car sitting beside the engine (or attached to it). The car itself is on it's side. It's an 88 turbo Z31, so it has an FS5R30A transmission like that of the RB25, Z32T, and RB26 internals. If you can find an RB25 or 26 bell-housing, you will be able to use it with your RB20 flywheel and clutch too. Quote Link to comment Share on other sites More sharing options...
Evan Purple240zt Posted December 16, 2007 Share Posted December 16, 2007 I actually got emails from Clive to get the Transmission on that Z31 if he has room for it. I would take it but he's in Hamilton. He said he knew someone with an RB engine and said it sat really nice in the engine bay. I think he was talking about yours. You should grab it if you have an RB20 Transmission and you're gonna put some extra kick into it. The engine is out of the car sitting beside the engine (or attached to it). The car itself is on it's side. It's an 88 turbo Z31, so it has an FS5R30A transmission like that of the RB25, Z32T, and RB26 internals. If you can find an RB25 bell-housing, you will be able to use it with your RB20 flywheel and clutch too. You can also use an RB26dett bellhousing. Thats what I have on my Z31t transmission! Definitely grab it!!! Evan Quote Link to comment Share on other sites More sharing options...
Doug71zt Posted December 16, 2007 Share Posted December 16, 2007 Bear in mind that it has 500KM on it. Doug Quote Link to comment Share on other sites More sharing options...
jasper Posted December 16, 2007 Share Posted December 16, 2007 Sorry to barge in. can't find info on how to start a new post. thanks.Tommy Quote Link to comment Share on other sites More sharing options...
jerryb Posted December 16, 2007 Author Share Posted December 16, 2007 haaaaaaaaaa...go to the forum that best fits your topic and then press the "New Thread" button.....away you go. Quote Link to comment Share on other sites More sharing options...
Careless Posted December 17, 2007 Share Posted December 17, 2007 You can also use an RB26dett bellhousing. Thats what I have on my Z31t transmission! Definitely grab it!!! Evan Right! That's what Boozt3d is using as well. Quote Link to comment Share on other sites More sharing options...
RB26powered74zcar Posted December 17, 2007 Share Posted December 17, 2007 Right! That's what Boozt3d is using as well. Yea but he's not using a Z31T trans, he used the rb26 front on a Z32 rear portion.... Quote Link to comment Share on other sites More sharing options...
Evan Purple240zt Posted December 17, 2007 Share Posted December 17, 2007 I did the swap in 2005 with the z31t trans. I used the tail housing from the z31. I have a z32 trans lying on my floor awaiting installation. The z31t trans has whined since day one! Its just getting worse, so time to swap again. Hopefully this one is fine. Evan Quote Link to comment Share on other sites More sharing options...
Careless Posted December 23, 2007 Share Posted December 23, 2007 Yea but he's not using a Z31T trans, he used the rb26 front on a Z32 rear portion.... yeah, it- as well as the rb25 bell housing will bolt up to all FS5R30A's, I've read. can anyone verify? Quote Link to comment Share on other sites More sharing options...
jerryb Posted February 23, 2008 Author Share Posted February 23, 2008 Hey all Im looking for a 240SX or a Z31 speed sensor...one of these... Anyone have a spare one for a decent price? Cheers Quote Link to comment Share on other sites More sharing options...
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