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I'm planning on doing a tune on my 2013 CL65. Knowing that stock bypass valves are not likely to give me proper control over boost I wanted to upgrade.
Weistec slaps their AMG tax on their parts and dings you $700 for their super deluxe whooshing BOVs that make your car sound like the fart piped turbo Honda.
I prefer a more mature stock sounding units.
Turbosmart has the answer either way. I picked up these internal bypass valves for less than half the Weistec price.
But thats a blow off valve and has no control of your boost whatsoever. What your looking for is the wastegate buddy
Not entirely true.
Wastegates control the boost. Bypass valves allow it to bypass when you let off the throttle. When they start to leak you lose boost pressure.
My car is 9 years old with 115k miles. I replaced them while the engine was out for turbo coolant seals.
S-600 w220, Nissan s13 coupe, and Nissan s13 convertible
Valid point, I've just never heard of a bov failing like that before. You did mention control of your boost and not maintaining boost, hence it's the wastegate your looking for. I been thinking about disconnecting my wastegates and just running full boost. Should be fun, I'll let you know when I try it
S-600 w220, Nissan s13 coupe, and Nissan s13 convertible
Just an update. I installed a manual boost controller and boy oh boy is the car fast. Too bad now I'm chasing misfiring problems with my 2006 s600. It's a love/hate thing with the v12. Love it when it's running right but hate it when it starts misfiring. Even though the misfiring is due to maintenence but it's pretty expensive to remedy. I wonder if the diaphram inside my wastegate is still in good condition. The car pulls hard but since I don't have a boost gauge installed, I don't know how well the boost is holding.
Hank you need to contact the fellow in California who makes up a voltage transformer with fuses and improved components as well as coil packs that will live.
Hank you need to contact the fellow in California who makes up a voltage transformer with fuses and improved components as well as coil packs that will live.
Hank you need to contact the fellow in California who makes up a voltage transformer with fuses and improved components as well as coil packs that will live.
I had no problems. They were replaced preemptively. We had the motor down to do the turbo coolant o-rings so it was an easy swap.
S-600 w220, Nissan s13 coupe, and Nissan s13 convertible
Brucewayne I have been in contact with Clark for the last couple of months. I bought his boost box and sent him both my coilpacks for repair. Before I sent it to him driverside bank was misfiring. When I got it back passenger side bank was misfiring. I bought a voltage transformer from fcp euro and it was still misfiring. Put the boost box back in and found that 2 of the leds didn't come on because of blown fuse. Replacing the fuse didn't help. I sent the boost box and passenger side coilpack back to Clark. Clark said the,coilpack had no issues. So hopefully the new boost box he sends me will fix the problem
Brucewayne I have been in contact with Clark for the last couple of months. I bought his boost box and sent him both my coilpacks for repair. Before I sent it to him driverside bank was misfiring. When I got it back passenger side bank was misfiring. I bought a voltage transformer from fcp euro and it was still misfiring. Put the boost box back in and found that 2 of the leds didn't come on because of blown fuse. Replacing the fuse didn't help. I sent the boost box and passenger side coilpack back to Clark. Clark said the,coilpack had no issues. So hopefully the new boost box he sends me will fix the problem
S-600 w220, Nissan s13 coupe, and Nissan s13 convertible
I sent the coilpack and boost box back to Clark. He checked the coilpack and said nothing was wrong with it. He sent it back to me with another boost box. I put the car back together. There's no codes, but the engine idles rough. The boost box's blue led is blinking, clark thought it might be a blown fuse, but i changed the fuse with a new one, and it's still blinking. Clark told me to send the boost box back to him. I seem to have terrible luck with the voltage transformer. I also ordered a voltage transformer from fcpeuro.com, and it threw a bunch of codes. I haven't been able to take the car for a drive since a tire decided to blow out from the sidewall. The new rims and tires I got were supposed to get mounted today, but it turns out I ordered 3 front rims by accident. Also, the old lugs are too long for the new rims, so I gotta order lugs along with a rear rim. I need to get some wheels on the car so I can get it back to my parking spot, then send the boost box back to Clark. Honestly, I'm tired of the ignition system in the m275 platform. I am seriously considering getting a stand-alone ecu or trying to install individual coilpack. The problem is figuring out what wire is the signal for which plug. I wish there was more info online for pinouts of the plugs. I mean, it can't be that hard, right? Coilpacks have 3 wires a positive, a negative, and a signal. Positive and negative can hook up to the battery, but figuring out the signal is the hard part. If anyone has any ideas, please let me know
Last edited by Hank Houston; Jul 26, 2024 at 11:31 PM.
279 powered cars have individual coils for each cylinder. My 2015 has needed one coil replaced in 135,000 miles. Much less drama than the 221 car that had new coil packs and voltage transformer when I purchased it. I replaced a coil pack while I owned it. It needed another and no doubt a VT when I traded it for the 222 car.
S-600 w220, Nissan s13 coupe, and Nissan s13 convertible
I've been curious about the m279 coils. It comes in a set, 2 coils per pack right? Does it still use the voltage transformer or did the do away with it and built it into thr coilpack like everyone else? I wonder what would be necessary to convert the m275 to the m279 coilpacks. I seriously want to convert to any coilpack other than mercedes, honda or ls coilpacks idc. Never have I had a car give me so much problems over spark. I've been dealing with this misfire issue for over a year now. I've bought 6 voltage transformers and all 6 were faulty. The shipping to send the coilpacks to Clark and back cost me over $400. I gotta send the boost box back to him to get checked out because it's faulty too. The amount of money I've thrown into the coilpacks and voltage transformer I think I could have bought a stand alone ecu and wired in some individual coilpacks. It scares me that I'll have to deal with this problem again in 20,000-50,000 miles. I absolutely love the v12 but goddamn does it come with a load of headaches. One thing I'm happy about is I redid the vacuum lines and bypassed all the electronic bull****. No more Limp home mode! Screw that I should be able to tell my.car when I want it to die or to take it easy and now I can hehehe
S-600 w220, Nissan s13 coupe, and Nissan s13 convertible
Hey Op, did you ever install those blow off valves? Are they direct replacements or did you have to disable the factory units and install the boy's somewhere else? I have been thinking about welding a pair of bov's to the intercoolers and blocking off the factory ones. But if the ones you bought bolt right up to the factory location, that would save me some time and money
I've been curious about the m279 coils. It comes in a set, 2 coils per pack right? Does it still use the voltage transformer or did the do away with it and built it into thr coilpack like everyone else? I wonder what would be necessary to convert the m275 to the m279 coilpacks. I seriously want to convert to any coilpack other than mercedes, honda or ls coilpacks idc. Never have I had a car give me so much problems over spark. I've been dealing with this misfire issue for over a year now. I've bought 6 voltage transformers and all 6 were faulty. The shipping to send the coilpacks to Clark and back cost me over $400. I gotta send the boost box back to him to get checked out because it's faulty too. The amount of money I've thrown into the coilpacks and voltage transformer I think I could have bought a stand alone ecu and wired in some individual coilpacks. It scares me that I'll have to deal with this problem again in 20,000-50,000 miles. I absolutely love the v12 but goddamn does it come with a load of headaches. One thing I'm happy about is I redid the vacuum lines and bypassed all the electronic bull****. No more Limp home mode! Screw that I should be able to tell my.car when I want it to die or to take it easy and now I can hehehe
I think the issue you'll face with an aftermarket coil system is that the M275 system uses the coil/spark plug system for detection of misfires and pre-ignition. The coil packs are not just coils, they have additional ion current sensing circuitry to accomplish this. I'd imagine the entire powertrain management system is going to cease to function without that misfire/pre-ignition information.
As far as I know, the M279 system is the same in this regard.
If you were going to throw an M275/279 in a race car, you could certainly fit a reluctor wheel to the front of the crank for ignition/fuel injection timing and have the block modified to accommodate a knock sensor so that you could use a standalone ECU, but in an existing car the ignition/fuel management subsystem has to interface with a lot of other stuff - boost control, instrument panel, transmission control, etc.
Last edited by brucewane; Jul 31, 2024 at 12:27 PM.
279 coils are a pair of coils and plug wires for each cylinder in one package. Similar to what we had in the E-55. Electrical connector implies similar operation as 275 with each coil trading off firing the plug with the other sensing how in cylinder events are going. Wiring harnesses plug into each bank of coils. I don’t see anything that looks as a voltage transformer under the hood. But then I haven’t gone digging either. System is reliable so far. With bigger turbos and more charge cooling it can be flashed to make 900 horses. Seems like that is enough. I haven’t turned mine up yet. That is one of many things on the to-do list. Time and money. When I have one I don’t have the other.
S-600 w220, Nissan s13 coupe, and Nissan s13 convertible
Johnlane install a boost controller and connect your blow off valves direct to the vacuum source. Only problem with connecting the blow off valves direct is that there is no way to regulate the torque. Definitely install the boost controller though and raise your boost. Leave the diverter valves plugged in so it won't throw any codes. I also removed the secondary air injection pump and blocked off the egr's which I also recommend doing. I could walk you through the process if you want
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