Locking out IMRC on stock manifold

[SmileForTheRearView]

Has anyone locked out IMRC on their gen 2 ?

wondering if it’s worth it to just go ahead and get a 2018 manifold especially if I have to pull the gen 2 off just to lock that out

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[Mdtaylorjr]

I'm sure someone can lock them out just have to have a tuner work with you. On mine I went with the gt350 over the 18 mani due to the direct plug in of the gt350 to the Gen 2.

 

[WildHorse]

Has anyone locked out IMRC on their gen 2 ?

wondering if it’s worth it to just go ahead and get a 2018 manifold especially if I have to pull the gen 2 off just to lock that out

Yep I did. Haven't noticed any detrimental effects at all.

 

[K4fxd]

What is the supposed advantage of locking them out?

 

[WildHorse]

What is the supposed advantage of locking them out?

1 less thing to go wrong.

 

[SmileForTheRearView]

Did you have to take manifold off?

1 less thing to go wrong.

Im thinking if I have to Pull manifold I might as well get a better manifold

 

[K4fxd]

You don't have to pull the manifold, just need a tune that turns them off. You can remove and plug the vacuum lines. The springs will keep em closed. err open.

 

[schmeky]

On the flip side I kept my IMRC functional on my Procharger build.

Let my tuner know this and I am surprised how well my little 308 cu. inch Coyote pulls down low and in the mid-range. A10 and 3.55 Torsen equipped rear gearing certainly helps too.

A just over 2K rpm there is noticeable smooth surge of torque that makes it effortless to pull way ahead of normal traffic.

 

[Mdtaylorjr]

On the flip side I kept my IMRC functional on my Procharger build.

Let my tuner know this and I am surprised how well my little 308 cu. inch Coyote pulls down low and in the mid-range. A10 and 3.55 Torsen equipped rear gearing certainly helps too.

A just over 2K rpm there is noticeable smooth surge of torque that makes it effortless to pull way ahead of normal traffic.

I have absolutely the opposite problem. From 2-3k rpms unless I'm running wide open it's a dog. I'm Na and running a gt350 top end, long tubes and cats.

 

[schmeky]

Mdtayloerjr

Have you discussed this with your tuner? Sounds like a missing link in your tune.

 

[EFI]

What's the point of locking out the IMRCs, especially on a manifold you already have?

You lose a bunch of torque down low/midrange and gain 0 power up top.

 

[SmileForTheRearView]

What's the point of locking out the IMRCs, especially on a manifold you already have?

You lose a bunch of torque down low/midrange and gain 0 power up top.

After putting headers on, I cracked a sensor when lifting up the engine. Right behind the manifold that has happened to some and I didn’t know to disconnect it before hand. Replaced the part but I’m still getting a check engine light because of it so a 60 dollar part vs the price of an 18 manifold right now is a lot better for me.
From what I read any actual loss in low end is negligible

 

[SmileForTheRearView]

Does anyone know what needs to be capped off? I’m sure that one on the back of manifold does

 

[hockale1]

You're wasting your time trying to disable IMRC/CMCV. It was included specifically to get this engine to run at lower RPM and has zero impact on WOT performance.

All you will achieve is degraded driveability and a dysfunctional ECU calibration.

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