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DIY: HOW TO delete your ISG Intake Sound Generator! Saves weight & eliminate un-mete

42K views 61 replies 25 participants last post by  Slow_GT  
#1 ·
DIY: HOW TO delete your ISG Intake Sound Generator! Saves weight & eliminate un-mete

This DIY was so easy I had it completed in 15 min or so (and you can too!) I bought a ISG block off plate from XPRD for 75.00 and proceeded to remove my broken/non-functioning ISG diaphragm and the ISG motor, tubing, brackets, etc.

When the ISG system fails it creates the possibility of un-metered air entering the intake and/or Boost pressure to be lost causing Rich/Lean conditions which can cause the ECU to either over or under compensate with the amount of fuel that is delivered.

I could have replaced the ISG diaphragm with a new one, but knowing this is a part that has a high failure rate history and it's only purpose is to pipe in fake exhaust sound to the interior of the car I thought it would be a better idea to just eliminate it altogether.

Benefits of this mod:
- Lose some weight! Lighter is faster!
- Eliminate the Un-metered Air Issue
- Much cheaper than replacing the ISG diaphragm
- My engine bay looks cleaner without it

My first idea was to just make the little metal plate myself. And I could have for sure, but in my researching the issue I found XPRD had already not only developed a fix for the same issue way before I even knew what a McLaren was, but he also had a small batch of the plates made up for his future fellow McLife enthusiast friends as well.

I'm no rocket scientist, but I'm pretty good with math and I know you can get a little flat piece of metal for way less than the price he sells this for. BUT, I also know how much time I personally would have to put into sourcing some raw metal plate, creating a template, cutting the piece out, test fitting it, cutting some more, applying a band-aid when I cut myself, drilling the bolt holes, etc, etc. And also all the time driving around and buying the things needed to cut, grind, drill as well. Time is money, right? So after doing the mental calculations I figured the XPRD solution was a bargain so I sent over my money and 2 days later I was very happy with the supplied item.

Did I mention it did not come with any instructions? That's cool because it was a snap to install, all you have to do is un-bolt your ISG valve from the intake (3 bolts), and install the block off plate using 3 bolts that match the shortest bolt you will remove (basically you are supplying new 2 bolts). Like I said... I'm no rocket scientist, so if i can do it then anybody can do this one. And if you are a weight saving fanatic like me, go ahead and remove those extra useless hoses, brackets and clamps while your in there.

I got excited with the entire project and also removed my carbon fiber engine bay side covers as well. I left them off because I think the engine bay looks much better being able to now see the inter-coolers, air boxes, and other plumbing. And I believe it improves the airflow to allow engine heat to escape as well.

Please follow the pictures below for a visual walk thru of this procedure.
 

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#4 · (Edited)
No lights. I just let the plug hang from the harness (it is short). Look a the plug just below my hand in the picture below. That is where I left it. One wire tire will make it tidy.
 

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#5 ·
You can remove as much or little as you desire. The picture below is every thing removable downstream of the block off plate.
 

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#8 ·
I left them open. I considered buying a few end caps to slide over them, I even considered a piece of duct tape as a temporary cap. After driving it with out anything capping the spots on the bulkhead I feel nothing is required to cover them once you do the ISG Delete. Save the effort, save the weight.
 
#12 ·
I have to go from memory, but 5-7 lbs would be fair. the little ISG motor is the heaviest part, but rubber tubing has alot of mass as well. I'm a weight savings fanatic! I will remove a paper clip if its not necessary in my car.
 
#13 ·
Could a bad diaphram cause misfires once in a while? More specifically, when it's hot out and at WOT? I know this would solve that if that is the case but I'm curious if a change in unmetered air would cause that.
 
owns 2012 McLaren MP4-12C
#14 ·
I agree with you, I doubt "in isolation" a leaky diaphragm would cause a misfire at WOT.


I have been a professional mechanic most of my life, and I have been luck enough to work on virtually every make and model of cars including exotics. Working on so many different brands and makes has given me a unique perspective regarding issues and the repairs necessary.

1) Most major issues are a result of an accumulation of many smaller issues that have gone unnoticed or neglected.

example: If you don't change your oil, eventually you get sludge and carbon buildup, and tiny oil passages designed to use the pressure of the oil can become blocked off leading to loss of performance (best case) or total engine failure (worst case). I bet no one reading this would dream of skipping an oil change...RIGHT? but how many of you have even checked the level of fluid in your McLaren's transmission? Ask my friend @Texan (that's his Forum name) what happens when your transmission fluid is low! His car would hard shift, and sometimes pop out of gear. Dealer said it needs a new transmission... He's a DIY guy as well and once he did a proper transmission fluid change, cleaned the filters, and also replaced the clutch fluid. Now his car shifts and performs better than ever!

2) All cars are made up of parts sourced from other manufactures, and pattern failures (small or large) plague every brand. Bosch makes the electronics for our cars, Michelin makes the tires, etc

3) Automotive engineers are super smart! but sometimes things are designed with compromises due to aesthetics, budgets,or time constraints.

The end result is once the car is in the real world, we become the product tester, we find the issues and we engineer solutions that improve the function and/or performance of the product.
 
#17 ·
I wasn't able to hear any difference when I changed the settings and I was going rough idle on a cold start sometimes. Of all the potential failures, this was the easiest and cheapest to try. And, many people don't like the ISG sounds anyway. I'd also do it to remove weight and clean up the engine bay a little, but tracing the hoses in my spider was beyond my capability at this time.
 
#40 ·
Keep those panels off, and enjoy looking at the actual engine and its cool design elements!

Kevin P
Supercar Garage - The McLaren Specialist
770-284-0172
Kennesaw GA
* Home of the flying McMedics... The only mobile McLaren Specialist! -We come to you!
 
#45 ·
#46 ·
You will not get any error lights removing the entire unit and using the block off plate. 😎

Kevin P
Supercar Garage ATL - The McLaren Specialist
770-284-0172
Kennesaw GA
* Home of the flying McMedics... The only mobile McLaren Specialist! -We come to you!

CLICK HERE >>> www.SupercarGarageATL.com
CLICK HERE >>> DIYs: McLaren Do It Yourself Thread
CLICK HERE >>> McLaren INTERCHANGABLE PARTS DATABASE !!!
correct. but fault is stored and may prevent passing a CA smog test however?
 
#51 ·