Pulling fuse 42
Melting Slicks
Joined: Jan 2017
Posts: 2,982
Likes: 1,040
From: Georgetown CA
2018 Corvette of Year Finalist
2017 C7 of Year Finalist
For me I just wanted to have it quiet in some situations and open all the time in others. I wanted that easily done and quick. So I just went with the mild 2wild setup and use the visor buttons. I have the exhaust set to Stealth in all settings and I just turn it on or off with the visor switch. No in between if there even is something.
Only way to really know I guess is if someone puts a camera on it. If they do, I would suggest also running the PDR at the same time to capture that video and telemetry, the tow videos could then be synchronized and the truth would be told.
When I get my car back I might see if I have a camera I can use to do that.
Only way to really know I guess is if someone puts a camera on it. If they do, I would suggest also running the PDR at the same time to capture that video and telemetry, the tow videos could then be synchronized and the truth would be told.
When I get my car back I might see if I have a camera I can use to do that.
Le Mans Master
Joined: Oct 2005
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Originally Posted by JerryU
See what I just added to my prior response (#17) that I found in the 2014 Service Manual (above.) In Tour valves are closed at idle and in Sport open!
I think I'm correct when cruising in Track in 7th gear that they are closed because it sounds that way. But perhaps the sound is the same because there is little gas flow at 1200/1300 rpm!
Have to see if some brave soul will hang out an open hatch and look or safer use a small camera! Actually, someone with a Mild to Wild can validate if the sound is the same when cruising in Track Mode and the fuse is bypassed!
I think I'm correct when cruising in Track in 7th gear that they are closed because it sounds that way. But perhaps the sound is the same because there is little gas flow at 1200/1300 rpm!
Have to see if some brave soul will hang out an open hatch and look or safer use a small camera! Actually, someone with a Mild to Wild can validate if the sound is the same when cruising in Track Mode and the fuse is bypassed!
Also just because diagnostically they can be commanded full open or full closed doesn't mean that those are the only two options.
Diagnostics are just that, tests, not functionality. That command more than likely is attempting to test the entire range of actuation.
Team Owner
Joined: Oct 2004
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I have a M2W installed, and you are correct. M2W "on" is the same as OEM with fuse in. M2W "off" is the same as pulling the fuse.
With the fuse installed and in Track mode (M2W "on"), there is no drone when cruising at highway speeds below 2K rpm (6th and 7th gear in an M7). With M2W "off" (same as fuse pulled) there is a noticeable drone.
Clearly the NPP valves are closing in Track mode with the fuse in at low rpms.
Last edited by Foosh; Mar 23, 2017 at 11:00 PM.
E-Ray, 3LZ, ZER, LIFT
Joined: Sep 2007
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From: NE South Carolina
Jerry,
With the fuse installed and in Track mode (M2W "on"), there is no drone when cruising at highway speeds below 2K rpm (6th and 7th gear in an M7). With M2W "off" (same as fuse pulled) there is a noticeable drone.
Clearly the NPP valves are closing in Track mode with the fuse in at low rpms.
With the fuse installed and in Track mode (M2W "on"), there is no drone when cruising at highway speeds below 2K rpm (6th and 7th gear in an M7). With M2W "off" (same as fuse pulled) there is a noticeable drone.
Clearly the NPP valves are closing in Track mode with the fuse in at low rpms.
Last edited by JerryU; Mar 24, 2017 at 12:17 AM.
Team Owner
Joined: Oct 2004
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I think it was just a bad manual writer, but the NPP valves are open in Track mode "most of the time." When the valves are closed during low rpm highway cruising, it is beneficial to eliminate a drone that is not at all pleasing
Last edited by Foosh; Mar 24, 2017 at 12:54 AM.
Le Mans Master
Joined: Nov 2015
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From: Lake Havasu City Arizona
Try to be a little more forceful with it. You wont break it. It is flexible plastic. And by the way. Be sure to look at the inside of the lid when you remove it. The diagram is there for all the fuses.
Team Owner
Joined: Oct 2004
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Forgot about the handles. Those are to remove the entire fuse box.
You don't need to touch the handles to remove the fuse box lid. Only the front two tabs on the lid need to be released.
Yes, the NPP fuse for '14 models is #41.
You don't need to touch the handles to remove the fuse box lid. Only the front two tabs on the lid need to be released.
Yes, the NPP fuse for '14 models is #41.
Last edited by Foosh; Mar 24, 2017 at 11:13 AM.
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Instructor
Joined: Nov 2015
Posts: 167
Likes: 23
From: Terrell, NC
Does anyone know the type of fuse used for #42? I lost mine after pulling it and I've tried micro2 size APT and APR and neither one is an exact fit. Or if anyone knows the GM part number. I ordered some from GM for my 2016 Z06 and they were wrong too! Slightly large with different contact posts. Thanks.
The GM part I ordered was part number 88861352 and it's definitely not correct.
The GM part I ordered was part number 88861352 and it's definitely not correct.
Last edited by bbdmac; May 29, 2017 at 05:17 PM.
Le Mans Master
Joined: Nov 2015
Posts: 7,382
Likes: 3,501
From: Lake Havasu City Arizona
Does anyone know the type of fuse used for #42? I lost mine after pulling it and I've tried micro2 size APT and APR and neither one is an exact fit. Or if anyone knows the GM part number. I ordered some from GM for my 2016 Z06 and they were wrong too! Slightly large with different contact posts. Thanks.
The GM part I ordered was part number 88861352 and it's definitely not correct.
The GM part I ordered was part number 88861352 and it's definitely not correct.
Melting Slicks
Joined: Jun 2004
Posts: 2,453
Likes: 81
From: Fishin' Pole FL
Does anyone know the type of fuse used for #42? I lost mine after pulling it and I've tried micro2 size APT and APR and neither one is an exact fit. Or if anyone knows the GM part number. I ordered some from GM for my 2016 Z06 and they were wrong too! Slightly large with different contact posts. Thanks.
The GM part I ordered was part number 88861352 and it's definitely not correct.
The GM part I ordered was part number 88861352 and it's definitely not correct.
Look inside the lid of the fuse box. Number 65 thru 75 are spare fuses
number 69 on my car is a 20A fuse.
Last edited by dndrsn; May 30, 2017 at 07:56 AM.
Instructor
Joined: Nov 2015
Posts: 167
Likes: 23
From: Terrell, NC
Thanks everyone for confirming. GM must have sent me the wrong parts because what I received was supposed to be correct but it clearly doesn't fit. I do have spares in those locations but since I lost the original I wanted to get some additional spare parts. Looks like you can't trust GM to ship the correct parts......
Melting Slicks
Joined: Jun 2004
Posts: 2,453
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From: Fishin' Pole FL
Race Director
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That's true they COULD BE but my understanding from when it was discussed very early on they are ONLY open or shut, agreed now by electric motors! There is feedback that caused some early issues in that regard but believe it's still open or closed valves. Have never seen a reference that said it varies the amount of opening.
Here it is. Lot's of very detailed info in posts 248 through 258 here: https://www.corvetteforum.com/forums...post1589742949
Last edited by Red Mist Rulz; May 31, 2017 at 05:47 PM.
Le Mans Master
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It's possible things have changed since the '15 model year, but try this. Drive at about 50 mph with the exhaust in Tour, then switch to Sport. On my '15, the exhaust gets louder. Then switch to Track. It gets louder still. That pretty much proves that in Sport at that speed it's neither fully open nor fully closed.
The only way around this I could see is for example you have different settings for left and right valves, but I think that only gets you three settings (both open, one open, both closed). Need to find out if that could be managed (pressure differential would be an issue), but even that goes out the window once you get to four distinct sounds!