When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I hadn't seen these before. Here is an excerpt of the product description:
RENNtech's 2nd Generation Diverter Valve for the M157 5.5L V8 BiTurbo features an all-new Blow-Off Valve implemented into the re-designed OEM turbo tubes.
The Diverter Valve releases the boost in high-boost situation and/or boost spikes. This especially helps during the shifting process, for faster shifting and a quicker boost response for the next gear. It helps to eliminated the so called 'Boost Lag'.
With the installation of the RENNtech Diverter Valve, we are able to supply the engine with more boost pressure in order to gain higher HP numbers.
i think its one, because both turbo inlets feed into the intake manifold. so if one turbo relieves the pressure, it'll do both of the turbo inlets since its a connected system
i think its one, because both turbo inlets feed into the intake manifold. so if one turbo relieves the pressure, it'll do both of the turbo inlets since its a connected system
Exactly, common discharge manifold from the turbos.
Impossible it may help with boost on shifts but it will never make more power
it will make more power if the tuner can turn up the boost more as a result ... that's their point, with the diverter valve supposedly they can turn up the boost a little
saw this all the time on audi/vw's where stock dv could only handle certain boost level and once surpassed would start leaking... swap to upgraded dv/bov and no boost lost and able to turn up boost more
it will make more power if the tuner can turn up the boost more as a result ... that's their point, with the diverter valve supposedly they can turn up the boost a little
saw this all the time on audi/vw's where stock dv could only handle certain boost level and once surpassed would start leaking... swap to upgraded dv/bov and no boost lost and able to turn up boost more
Yeah your correct but it's different with the amg we don't have any kind of diverter valve on this car as far as I'm aware
Yeah your correct but it's different with the amg we don't have any kind of diverter valve on this car as far as I'm aware
in our cars the boost pressure is controlled electropneumatically by the boost pressure actuator. To control the boost pressure, the boost pressure actuator is actuated by the ECU according to a performance map and according to load. ecu monitors pressure upstream and downstream of throttle valve so it will know that its getting more boost up top than its supposed to and will intervene
with the dv the tuner could put in a little more boost and sidestep some of the ecu intervention before the shift point is reached in theory to milk out a few extra hp for selling point purposes... now if it will actually make a noticeable difference in real world performance is yet to been seen on our M157s
I don't see how this could possible allow more boost to be run over stock setup. There is no mechanical pressure release avail in the current system. Boost is bled through spark and fueling drop out, and basically letting the cylinders fill with air and delayed actual throttle closing. Additionally the waste-gates are vacuum and not boost referenced, so you can control them relatively independent from boost pressure with solenoid. There is nothing to "leak" boost...its a physically closed system, so I don;t get how you can run more boost.
Now I have my suspicious the OEM setup is causing damage to turbos, especially upgraded turbos due to not being able to bleed enough boost to prevent surging and stalling the compressor. I have heard of a few failed turbos now running high boost, so I am actually going to run a turbosmart VeePort BOV once I put my stage 2 turbos on.
I was going to weld in a T pipe , similar to the weistec setup, but upon seeing this, I can see that it would work just as well for the points mentioned above, ie that both turbo pipes merge at a "y" in front of the IC. This setup actually lets you run a bigger BOV, for more venting capability. It's ugly but probably a better option than a small 38mm one under the IC core. I was contemplating running the RK intakes, which would allow two Vee port BOV's to be welded direct to each side of the turbo to IC Pipes, as the RK intakes would remove the stock turbo feed pipes currently in the way of doing that.
Anyhow, unless renntech has found some way to bypass the oem boost bleed strategy, which perhaps was a limiter to absolute boost, I don;t get how it make power.
Side note, that anyone can get this done themselves for around $300 including the cost of a decent BOV, the $10 of alum pipe and the $50 to pay someone to weld it on to your driver side turbo to IC pipe.
I have been looking at one of these recently too. I kept scratching my head wondering why my car felt sluggish after a shift and now am realizing it's the substantial turbo lag post shift. Regardless, this seems like a really easy DIY as long as you have the correctly sized BOV, I feel most can disassemble their own turbo pipes, and as long as there's substantial pictures and measurements a majority of shops could weld in the pipe for cheap. That being said which BOV would be appropriate? I know cars decently but haven't considered a BOV in the past so I'd like as much information as possible.
I have been looking at one of these recently too. I kept scratching my head wondering why my car felt sluggish after a shift and now am realizing it's the substantial turbo lag post shift. Regardless, this seems like a really easy DIY as long as you have the correctly sized BOV, I feel most can disassemble their own turbo pipes, and as long as there's substantial pictures and measurements a majority of shops could weld in the pipe for cheap. That being said which BOV would be appropriate? I know cars decently but haven't considered a BOV in the past so I'd like as much information as possible.
It seems strange to have on a automatic? I don't think the throttle plate closes during a shift?
Doesn't seem strange on an automatic. I used to think Automatic turbo cars were strange but here we are as owners of them. Also reading Renntech and Weistec's information on them apparently they do close the throttle plate. Now don't get me wrong this could just be to sell an extra bit of kit. But in theory in makes sense. That or our car's are loosing boost via the diverter valves at high pressures?! Either way, I love to do slight mods to the car, so this will be no different. $215 for the DV and anotther ~$150 for welding. I'm ok with that... Also I believe the Tial QRJ is what Renntech is using on their generation 3 DV as well.
I installed one on my 2012 E63 and its pretty staright foward. The only thing I did that was not described in the Renntech instructions was remove the radiator fan. The side of the pipe that connects to the turbo is a pain in a** to take off and put back on. I used some petroleum jelly and some elbow grease to get it back on. Other then the pipe there is one vacuum line that runs to the back of the engine near the fire wall. It took me about three hours. It sounds like most blow off valve with the loud Psshhh of air.
I installed one on my 2012 E63 and its pretty staright foward. The only thing I did that was not described in the Renntech instructions was remove the radiator fan. The side of the pipe that connects to the turbo is a pain in a** to take off and put back on. I used some petroleum jelly and some elbow grease to get it back on. Other then the pipe there is one vacuum line that runs to the back of the engine near the fire wall. It took me about three hours. It sounds like most blow off valve with the loud Psshhh of air.
What is your feedback on the impact to driving? Does the car seem quicker? Less turbo lag? Would you do it again knowing the outcome?
Any videos of the BOV sound while driving aggressively?
I am pretty interested in this part but want to be confident that it will be worth it before I purchase & install.
Thanks in advance for any additional feedback you can provide.
What is your feedback on the impact to driving? Does the car seem quicker? Less turbo lag? Would you do it again knowing the outcome?
Any videos of the BOV sound while driving aggressively?
I am pretty interested in this part but want to be confident that it will be worth it before I purchase & install.
Thanks in advance for any additional feedback you can provide.
I personally dont think there is any impact on driving. My car is tuned so that was the main reason for getting the diverter valve. With the boost turned up (I beleive 21 psi) I wanted to make sure my turbos were safe from the back pressure of slamming the throttle shut. I can take some pics and make a quick vid after work. This guy has one installed on his E550 and its exactly the same except for the gold foil. https://mbworld.org/forums/e-class-w...ch-d-e550.html
Here is the link to the video. The windows were rolled up and it was made with my cell phone so not the best audio. But you can here the valve blowing off as the gas pedal is lifted.
https://youtu.be/4dLZ9GgRqbo
Here are the photos as well. The one in the back near the ECU is where the vacuum line connects. Don't mine the intake, the OE ones ripped and I needed a quick fix till my other ones come in.
Last edited by T_Cob; 06-06-2018 at 04:37 PM.
Reason: Photos
Here is the link to the video. The windows were rolled up and it was made with my cell phone so not the best audio. But you can here the valve blowing off as the gas pedal is lifted. https://youtu.be/4dLZ9GgRqbo
Here are the photos as well. The one in the back near the ECU is where the vacuum line connects. Don't mine the intake, the OE ones ripped and I needed a quick fix till my other ones come in.
Thanks for the video! Do you hear them at all during upshift?
01-21-2017, 11:12 PM
Either way, I love to do slight mods to the car, so this will be no different. $215 for the DV and anotther ~$150 for welding. I'm ok with that... Also I believe the Tial QRJ is what Renntech is using on their generation 3 DV as well.
