renesis swap

cwliggett · 08-01-2009, 02:48 AM

Hi, I would like to put my rx8 renesis rotary motor and six speed trans in my 1972 datsun 240z! Does anybody know if I can use stock ecu and to wire it up? Please Help! Thanks alot! CHAD

djmtsu · 08-01-2009, 07:54 AM

Anything is possible with money.

cwliggett · 08-02-2009, 04:33 PM

Hi Guys and Gals, I need help with stock ecu and wiring the renesis rx8 motor/6 speed trans! I don't need reply anything possible if you have money! I need answer to the Question! Please Help! Thanks! CHAD

djmtsu · 08-02-2009, 07:03 PM

A Renesis has been swapped into a first gen RX-7 years ago.

You need the entire wiring harness, engine, trans, custom driveshaft. You need to make sure the 240Z clutch master cylinder can be adapted, or use a custom set up. You also need a full set of custom gauges along with a speedometer solution.

Keep in mind that you will also need to sort out an oil cooler (a second gen would work well).

These are all basic things, and apply to almost any cross-breed engine swap. Custom engine and trans mounts. Custom exhaust set up, and intake.

And it takes money

need RX7 · 08-02-2009, 08:40 PM

Will the ECU go into some kind of limp mode if it doesn't see input from all the electronic stuff that the RX8 has that the Datsun doesn't have (ABS, traction control, etc)? I have a feeling much more electronic trickery will be involved that just tossing in the stock ECU.

PS, this topic would see more traffic if it was in the rotary tech section. It'll probably get moved soon enough.

NoDOHC · 08-03-2009, 10:39 PM

Why go Renesis? It is not that hard to get equivalent power out of a S4 13b and it will cost you a lot less (fewer electrical woes to sort out, better documentation available, more readily available aftermarket parts, etc.). Even an s5 13B (much easier to make equivalent power out of) would not cost anywhere close to a Renesis.

I have $750 in my entire engine build, including purchasing the engine and make 200 WHp.

cwliggett · 08-05-2009, 09:39 PM

Hi, Thanks for inputs I have two renesis motors and 6 speed transmission! I have microtech ecu but it doesn't open the intake VFAD,APV,VDI,SSD valves! So, that means I have to keep them open! This is why I was hoping someone could tell me how I could use stock ecu! Fly by wire throttle body for cable pull operation that was a proplem to with stock ecu. Thanks for inputs! CHAD

NoDOHC · 08-05-2009, 11:33 PM

Oh! I didn't realize that you had the engines already.

I don't think that there is a pat formula for installing a newer fuel injected engine in an older car. You will most likely need to lengthen portions of the wiring harness and install resistors or dead modules in the harness in other places to trick the ECU. Traction Control and ABS may also be issues on the older car. I know that there are a certain amount of harness building requirements for the LS1 into FC swap.

I think your best bet is to tackle the project with a factory RX8 service manual or a good (Haynes, Cloyes, etc.) manual in hand. A manual for both cars would help you.

I don't know a lot about Renesis engines or Microtek ECUs, but my Haltech has RPM switch outputs that you could drive Relays with to open those ports you speak of.

cwliggett · 08-06-2009, 01:04 AM

Thanks alot!!! I will look and see about the RPM switch outputs. That is what I'm talking about! That would be awesome! Thanks again! CHAD

***TitaniumTT*** · 09-07-2009, 10:12 PM

I believe Motec has a Plug and play option for the Renisis that would make all those problems go away

rotaryracer · 01-31-2010, 12:38 AM

I'm installing a Renesis in my '79sa. I'm custom building an intake for a side draft mikuni and exhaust header. I really like the 1 off idea. Unique all the way! It helps to have a bro that does tube bending and spare parts. Ultimate goal is to fit a RX'8 suspension under a 1st gen. I'll get pics asap on the other forum of course. Please keep us posted on your build.

rotaryracer · 03-04-2010, 10:53 PM

I'm going carb. I don't have money!!! Imagination and want to have something different. I'll post photos and budget as soon as I can. I own a 9 digit '79sa. 12a parts are too hard to find and simply wanted something different. So, decided on Renisis (stuck with 4 port) w/Mikuni 44. Hoping for 200+/-. Please try not assume that everyone has gobs of money simply because we want something different. I respect this site and it's members. Usually lots of great advice and support. I thank you for that support and great advice.

reddozen · 03-05-2010, 10:29 AM

Another solution is to just get the RX8 dash harness and gauge cluster... it's all ECU controlled... even the radio is ECU controlled. As for missing electronics, you could get an access port and have mazda maniac tune the car and disable all the warnings / ignore them. He sells the Access Ports for $500 tuned.

08-01-2009, 02:48 AM	#1
cwliggett The Newbie Join Date: Aug 2009 iTrader: (0) Posts: 4 Rep Power: 0	renesis swap Hi, I would like to put my rx8 renesis rotary motor and six speed trans in my 1972 datsun 240z! Does anybody know if I can use stock ecu and to wire it up? Please Help! Thanks alot! CHAD

08-01-2009, 07:54 AM	#2
djmtsu My minds tellin' me no... Join Date: Feb 2008 Location: Murfreesboro, TN iTrader: (10) Posts: 4,043 Rep Power: 21	Anything is possible with money. __________________ 1976 Mazda Cosmo RX-5 1976 Mazda Cosmo RX-5 2003 Toyota Tundra TRD 2015 Toyota 4Runner SR5

08-02-2009, 04:33 PM	#3
cwliggett The Newbie Join Date: Aug 2009 iTrader: (0) Posts: 4 Rep Power: 0	renesis swap Hi Guys and Gals, I need help with stock ecu and wiring the renesis rx8 motor/6 speed trans! I don't need reply anything possible if you have money! I need answer to the Question! Please Help! Thanks! CHAD

08-02-2009, 07:03 PM	#4
djmtsu My minds tellin' me no... Join Date: Feb 2008 Location: Murfreesboro, TN iTrader: (10) Posts: 4,043 Rep Power: 21	A Renesis has been swapped into a first gen RX-7 years ago. You need the entire wiring harness, engine, trans, custom driveshaft. You need to make sure the 240Z clutch master cylinder can be adapted, or use a custom set up. You also need a full set of custom gauges along with a speedometer solution. Keep in mind that you will also need to sort out an oil cooler (a second gen would work well). These are all basic things, and apply to almost any cross-breed engine swap. Custom engine and trans mounts. Custom exhaust set up, and intake. And it takes money __________________ 1976 Mazda Cosmo RX-5 1976 Mazda Cosmo RX-5 2003 Toyota Tundra TRD 2015 Toyota 4Runner SR5

08-02-2009, 08:40 PM	#5
need RX7 Clean S4 Nutswinger Join Date: Mar 2008 Location: Sterling Heights, MI iTrader: (0) Posts: 485 Rep Power: 17	Will the ECU go into some kind of limp mode if it doesn't see input from all the electronic stuff that the RX8 has that the Datsun doesn't have (ABS, traction control, etc)? I have a feeling much more electronic trickery will be involved that just tossing in the stock ECU. PS, this topic would see more traffic if it was in the rotary tech section. It'll probably get moved soon enough. __________________ -Ted -1986 Mazda RX7 Sport [DD/beater]: engine finally let go at 205k. parts car status. -1986 Mazda RX7 base [resto-mod project]: S5 n/a swap in progress.

08-03-2009, 10:39 PM	#6
NoDOHC The quest for more torque Join Date: Sep 2008 Location: Sheboygan, Wisconsin iTrader: (1) Posts: 855 Rep Power: 17	Why go Renesis? It is not that hard to get equivalent power out of a S4 13b and it will cost you a lot less (fewer electrical woes to sort out, better documentation available, more readily available aftermarket parts, etc.). Even an s5 13B (much easier to make equivalent power out of) would not cost anywhere close to a Renesis. I have $750 in my entire engine build, including purchasing the engine and make 200 WHp. __________________ 1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers) 1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic)

08-05-2009, 09:39 PM	#7
cwliggett The Newbie Join Date: Aug 2009 iTrader: (0) Posts: 4 Rep Power: 0	renesis swap Hi, Thanks for inputs I have two renesis motors and 6 speed transmission! I have microtech ecu but it doesn't open the intake VFAD,APV,VDI,SSD valves! So, that means I have to keep them open! This is why I was hoping someone could tell me how I could use stock ecu! Fly by wire throttle body for cable pull operation that was a proplem to with stock ecu. Thanks for inputs! CHAD

08-05-2009, 11:33 PM	#8
NoDOHC The quest for more torque Join Date: Sep 2008 Location: Sheboygan, Wisconsin iTrader: (1) Posts: 855 Rep Power: 17	Oh! I didn't realize that you had the engines already. I don't think that there is a pat formula for installing a newer fuel injected engine in an older car. You will most likely need to lengthen portions of the wiring harness and install resistors or dead modules in the harness in other places to trick the ECU. Traction Control and ABS may also be issues on the older car. I know that there are a certain amount of harness building requirements for the LS1 into FC swap. I think your best bet is to tackle the project with a factory RX8 service manual or a good (Haynes, Cloyes, etc.) manual in hand. A manual for both cars would help you. I don't know a lot about Renesis engines or Microtek ECUs, but my Haltech has RPM switch outputs that you could drive Relays with to open those ports you speak of. __________________ 1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers) 1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic)

08-06-2009, 01:04 AM	#9
cwliggett The Newbie Join Date: Aug 2009 iTrader: (0) Posts: 4 Rep Power: 0	renesis swap Thanks alot!!! I will look and see about the RPM switch outputs. That is what I'm talking about! That would be awesome! Thanks again! CHAD

09-07-2009, 10:12 PM	#10
*TitaniumTT* Test Whore - Admin Join Date: Mar 2008 Location: Right Behind you son iTrader: (4) Posts: 4,581 Rep Power: 10	I believe Motec has a Plug and play option for the Renisis that would make all those problems go away __________________ -The Angry Stig- DGRR 2009, 2011, 2012 & 2013 - Best FC DEALS GAP!! WOOHOOOO!!!!! 2015 Audi S4 - Samantha - Zero Brap S4 2004 RX8 - Jocelyn - 196rwhp, 19mpg fuel to noise converter 2000 Jeep Cherokee Sport - Wifey mobile - Now with 2.5" OME lift and 30" BFG AT KO's! So it begins 1998 Jeep Cherokee - 5 spd, 4" lift, 33" BFG's - Rotary Tow Vehicle 1988 'Vert - In progress 1988 FC Coupe - Gretchen -The attention whore BEAST! I'm a sick individual, what's wrong with you? I'm pure Evil I'm still insane, in the best possible way. I think Brian's idea of romance is using lube. Your rage caused the meteor strike in Russia. The Antichrist would be proud of his minion. You win with your thread. Most everything It's a truck with a steel gate on the back. Just a statement of fact Motec M820, AIM dash, ported 13B-RE Cosmo, 6-spd trans, 4.3 Torsen, custom twin wg fully divided mani, Custom 4" split into 2x 3" exhaust, Custom HMIC, Custom custom custom custom I like to welder stuff.... No Bolt-ons allowed. Dyno'ed @ Speed1 Tuned by me - 405rwhp on WG.... WM50 cuming soon. *-Angry Motherfcker Mode ENGAGED-**

01-31-2010, 12:38 AM	#11
rotaryracer The Newbie Join Date: Dec 2009 Location: Tulsa,Ok. iTrader: (0) Posts: 20 Rep Power: 0	I'm installing a Renesis in my '79sa. I'm custom building an intake for a side draft mikuni and exhaust header. I really like the 1 off idea. Unique all the way! It helps to have a bro that does tube bending and spare parts. Ultimate goal is to fit a RX'8 suspension under a 1st gen. I'll get pics asap on the other forum of course. Please keep us posted on your build.

03-04-2010, 10:53 PM	#12
rotaryracer The Newbie Join Date: Dec 2009 Location: Tulsa,Ok. iTrader: (0) Posts: 20 Rep Power: 0	I'm going carb. I don't have money!!! Imagination and want to have something different. I'll post photos and budget as soon as I can. I own a 9 digit '79sa. 12a parts are too hard to find and simply wanted something different. So, decided on Renisis (stuck with 4 port) w/Mikuni 44. Hoping for 200+/-. Please try not assume that everyone has gobs of money simply because we want something different. I respect this site and it's members. Usually lots of great advice and support. I thank you for that support and great advice.

03-05-2010, 10:29 AM	#13
reddozen Gold Wheels FTW Join Date: Mar 2008 iTrader: (0) Posts: 744 Rep Power: 17	Another solution is to just get the RX8 dash harness and gauge cluster... it's all ECU controlled... even the radio is ECU controlled. As for missing electronics, you could get an access port and have mazda maniac tune the car and disable all the warnings / ignore them. He sells the Access Ports for $500 tuned. __________________ My Cars: 1974 RX4 Coupe 1991 FC3S RX7 - Sold 2003 ZZW30 MR2 (Rotary swap after RX8) 2004 SE3P RX8 (20B Swap in the works)