Renesis questions

[Rotary Related]

Originally Posted by Pete_89T2

Does the RX8 Renesis use a cable-linked throttle, or is it a drive-by-wire throttle, as many newer cars are these days? I don't know the answer to that question, but if it's the latter, won't he also need to transplant at least parts of the gas pedal assembly & associated wiring from the donor RX8 to get this to work?

You are correct in assuming it's drive by wire. You would need the pedal or modify the factort pedal to use the sensor or something along those lines.

The following is not directed towards pete_89T2:

Using the factory ECU is not the best choice as you would need various components from the RX-8 to make it work correctly. I haven't checked but the RX8 probably has a fuel tank pressure sensor or at least a evap pressure sensor or possibly both. So you'd need an rx8 charcoal canister and to modify your fuel tank for a pressure sender. You'd have to use a catalytic converter and two oxygen sensors to satisfy the ECU as well. Next you'd need the rx8 airpump and have to use the rx8 secondary air injection stuff. Using a standalone would get rid of all this and much more. You might even be able to use only four injectors instead of six. Using different sized injectors of couse. The factory ECU im assuming talks to the ABS computer and all that to calculate the traction control. So there's a bunch more rx8 stuff you would need to satisfy that. You can see where this is going. Let's just say it would be ten times easier to use a standalone and leave it at that.

It's not your car, it's not your engine don't worry about it. Just answer the original posted questions or don't it's pretty simple. Does anyone make a throttle body with a cable like a older car for the Renesis engine? I'm guessing the answer is no.

Does anyone make porting templates for the Renesis? Someone I'm sure does. I doubt the Renesis is so perfect from the factory that porting one would do nothing. Maybe it is I don't know that's why I asked. maybe NoDOHC is right in that respect.

The Renesis has a VDI valve (vacuum controlled like a S5 NA engine), APV (6PI valve direct electronic control instead of the older style vacuum controlled diaphrams), and a SSV (Secondary shutter valve which is also vacuum controlled like the VDI valve) for the record. The VDI adds the "supercharging" effect like in the S5 engine so it's just like the S5 engine, nevermind how it looks it provides the same outcome. So it's the same. The APV or 6PI does the same thing as the S5 NA engine so there again it's the same. It just opens the aux. ports nothing different there. True it operate differently but it does the same thing. The SSV has the ability to close the outermost lower port completely. This is not found on the S5 NA engine. So there's one difference. Who's to say it just couldn't stay open all the time? or closed all the time? or how hard is it to open and close? some wiring and a couple key strokes on a programable ECU software? wow that's hard how will anyone ever figure that out? It's two whole wires! I'll surely be defeated by two wires after all the work it would take to put that engine in the vehicle.

Anyways let's continue on topic and ignore the remarks of people who are not interested in finding the solution. I think I'm going to open the throttle body to investigate whether it can be modified to recieve a throttle cable which would make the swap much easier. If I do decide to do so I will post pictures of the inside of the throttle body for people to use as future reference, so they won't have to open one themselves.