v8eater

Just thinking about future upgrades. Can a stroker be built to run properly in a '90 Renix? In other words-no computer just like it is now. i know I will be giving up some power but I really don't want to deal with all the wiring and sensor stuff.
I did search but really didn't see a definite answer.
Thanks James L.

jakbob

if you are talking about making a carbed stroker, i would imagine the answer would be yes. but then you would have to work out a way to eliminate the TCU as well (plugs into the TPS), new intake (get rid of the injectors), pretty much anything controlled by the ECU and TCU. Renix definitely has a computer. this is just off the top of my head. if anyone one else wants to chime in, lets go..

desertdog

I see no reason you can't make a stroker with a Renix. The only real difference is the computer. There are no aftermarket chips available for Renix computers, that I know of, so you will have to figure out how to get the right fuel flow via other means. Personally I think most OBD-friendly chips are useless anyway, so you're better off learning how to tweak the system manually. A rheostat inline with the right sensor, and a wideband O2, should allow you to manipulate the injector output. At least, that's my plan when I turbo my Jeep...

Gee oh Dee

The Renix isn't carburated and does have a computer.

I have an 87.

AnoniWeezy

And the renix comp does not store codes or parameters
So no modifications can be done to it.
Gonna need a msd mega squirt system or something like that.
We used em all the time on our turbo neons.

Gee oh Dee

You sure about that...?

AnoniWeezy

Me?
About the renix comp? Yes.
Read all over the forum. And I have a 90
No CEL and no codes unless its running (codes arent stored) and checked with a renix diag tool.

About the mega squirt, positive.
It works in conjunction with your comp and modifies fuel mapping.

Gee oh Dee

About that being the only option.

AnoniWeezy

No as I said,
"a msd megasquirt or something like that"
You have to be able to adjust fuel map
And unless ya want to have a ton of tiny resistors all over your sensor wires that have to be changed based on air temp, pressure, water temp, etc then you will need an external comp adjuster.

chamber

what are the steps to be taken to do this?

AnoniWeezy

Again, me??
Msd has a website

cruiser54

Use 24 lb injectors on a Renix stroker and you'll be fine.

hankthetank

^^^werd. i personally think a renix will respond well and easily to a bit of a stroke increase. heavier injectors, and a larger throttle body to make it worth it.

cruiser54

That's what I'm building. Just got the crank and rods back from the machine shop yesterday.

5-90

Erm, the RENIX 6-242 is computerised, as it runs multi-port electronic fuel injection (and is therefore electroncally-controlled.)

However, the RENIX computer seems to respond rather well to modifications like stroking - or forced induction (although a change of the MAP sensor is required there, and a supplemental fuel controller may be required, I don't know yet.)

The stroker is supported well by a simple fuel injector change - the OEMR RENIX units are spec'd for, I believe, 19#/hr @ 39psig. Generally speaking, going with a "full-on OTS" stroker (meaning the 6-258 crankshaft and bore +0.060", or about 280ci, should work well using fuel injectors rated for 23#/hour @ 39psig, or equivalent rating.) The ECU can usually adjust the fuel curve to fit the engine displacement and operating speed, once the capability to deliver sufficient fuel is in place.

The above leads me to believe that the RENIX ECU has an "open-ended" programme, where it will use programmed tables for baseline values and adapt them according to noted operating conditions (this is fairly unusual, since most electronic engine control setups have hard-coded "lookup tables" for most values at most operating conditions, and limited adaptability. This is what made "blowing PROMs" or "burning PROMs" - flashing the ECU - for GM equipment so popular, you'd actually change the baseline lookup tables. It's easy enough to do with GM, it's more difficult with Ford or Chrysler, and don't get me started with most imports not made by Toyota or Honda!)

You want to stroke your RENIX? Don't let me stop you! Get the stroker parts (258ci crankshaft, 258ci connecting rods, and pistons to fit your (re)bore job; and sufficiently-sized fuel injectors) and build away! The fuel injectors should be easy enough to find - they're standard early Bosch units, which were used by pretty much every and saturate the aftermarket. I'd start with FiveO Motorsports - they sell sets that are balanced for flow and cleaned & tested, and have listings for our beloved AMC six.

ADD'L - Having a bored throttle body can be nice, but isn't essential. A bored throttle body isn't a performance adder on its own, as most OEMR throttle bodies can support something north of 125% of the engine displacement at redline anyhow (RENIX throttle bodies support a theoreticaly 130% of flow of the 6-242, at redline, assuming 100% VE. The VE of the RENIX 6-242 is closer to 80-85%, and you're not adding enough displacement to make up for that anyhow.) The throttle body will give you crisper throttle response (I could go into the geometry of why, but I honestly don't think it's necessary...) but it won't add power capacity in se. Swapping cams and porting your head would give far better results per dollar spent, in terms of actual performance gain...

TANGENT - I'm considering finding a 12-cw crank for a 6-258 (I have a manual transmission, and the extra rotating mass will smooth out shifting and takeoffs,) and having it offset ground to about 4.000". If I can find a RENIX block that will support a 4.000" bore (or +0.125" - which is twice the standard accepted max overbore,) that will net me about 301ci displacement, and net significant power gains.

Considering what else I want to do to that engine, installation will have to wait until I leave CA (damn them for freezing the rolling 30-year exemption from Smog...)