Wiring Open Secondaries

[stephen newberg]

Wiring these open and taking the IRMC out of the loop completely has been mentioned by a number of people that have done this. I think the general Gen III community would be interested in knowing more. I certainly would. Could people that have done this post here, letting us know:

1. how you did it mechanically,
2. how long you have been running wired open,
3. where in the continent you are at so we can get a weather/temperature fix, and
4. in general your feelings about how the car has reacted to the change in any ways that you have noticed?

Also, if anyone of you have a digital camera, photos of the completed wire open job would certainly help some members that have not done this, but are thinking of doing so.

pax, smn

 

[SHOZ123]

I did it using two wire ties to bind the linkage actuators together while the secondaries were held open. I live in East Central Illinois and drove it this way this past winter.

Only noticed a slight bogging when the engine was first started and it was below 20F. Other than that no noticeable differences other than sound. With them open all the time you get a lower pitched growl around 2500-3000 rpm.

I have since had some chip tweaking and have removed the butterflies and shaft altogether as well as the IRMC box and cable. I am completely happy to not have to worry about the cable breaking, small plastic internal gear on the box breaking or the secondaries sticking closed or open.

 

[DavidT]

what does this do for gas mileage and torque?

 

[Mr. SHO]

Nothing and nothing. There is no difference in performance or economy. As mentioned, the only noticable differences is a little bogging and rough idle right at startup when it's cold, and the psychoacoustics of the fictional power surge at 3350rpm is no longer as pronounced--it comes in gradually at about 2500rpm.

Paul might be getting a tad more HP from better breathing up high since he physically removed the shaft and plates.

 

[stephen newberg]

Paul, did you take any pictures of your removal job, and the results with the shaft and plates gone that you could post?

pax, smn

 

[SHOZ123]

I have a picture of one cylinder port with the shafts removed but nothing else.

 

[stephen newberg]

Love to see it. Could you post it, or would you rather send it along to those interested by individual email?

pax, smn

 

[Fudog]

Would something like this work on the Gen II?

 

[SHOZ123]

It would be detrimental for the V6 as it has true dual runners. The V8 only has isolated intake valves.

Here is a pic of the IRM without the butterfies or plates.

 

[CT97White]

My experience with open secondaries is similar to Paul's. I first used tie wrap but could not get it tight enough to hold the butterflies open all the way. With the tie wrap still in place I wrapped a piece of clothes hanger wire from the IMRC cable bracket to the arm of the butterfly shaft & tightened it with a pair of pliers. It isn't really pretty, but it is holding them open all the way.

I live in central Connecticut and I did this around January this year, during one of our coldest winters in recent memory. I never had any trouble starting the car, even below zero degrees F. The idle did seem a bit unstable especially when it was really cold out and the car was not warmed up & it also smelled a bit rich. The new programming from Doug seems to have taken care of both of those issues as I told him about my secondaries before he burned the chip.

All things considered, I like the car better without the secondaries, although the difference is surprisingly small.

 

[stephen newberg]

Thanks guys. I think I will do this also. Perhaps I will start on it tomorrow. I will let you know how it goes.

pax, smn

 

[mcgilles]

can this be done electronically? there are some wires on the IRMC box, could a couple of them be jumpered to open the secondaries? then you could run a switch and open them electronically?!?

 

[SHOZ123]

can this be done electronically? there are some wires on the IRMC box, could a couple of them be jumpered to open the secondaries? then you could run a switch and open them electronically?!?

If you have a functioning IRMC, why?