IDK about that...with the renntech module my car starts significantly louder and idles louder on cold start or warm start than without it...the only explanation i can think of is the position of the valves. Even in Race mode once the car is warmed up all the valves arent completely open until 4K RPM.
Quote:
Originally Posted by Skilly
I think that I understand what you are saying; however, I cant verify with the RENNtech set up.
Factory default on start up is valves open and, to your point, COMFORT mode. After oil is distributed through the motor and the safety warm up is complete, the valves close - RENNtech may do this too but louder due to the 100% open override. With CETE, it eliminates this start up feature, and the car will always start (in COMFORT) with the valves in the closed position.
IDK about that...with the renntech module my car starts significantly louder and idles louder on cold start or warm start than without it...the only explanation i can think of is the position of the valves. Even in Race mode once the car is warmed up all the valves arent completely open until 4K RPM.
Multiple perspectives converging.
With CETE or RENNtech, the purpose is largely to fully open the exhaust values when they are opened. From the factory they have been limited (moreso in the 2020 models). In the factory 2018 I have, during a cold start, the exhaust values will be default open similar to the EVM settings (100% vs <100%), and then once oil is distributed through the motor and an acceptable temp is reached, they close (usually about a minute).
For the CETE module, it changes that - the default cold start opening is over-ridden and the EVM is controlled via the button or engine settings only - so it always starts with valves closed. I'm not sure how the RENNtech works during cold starts, not to be confused with regular operation. For me, I didn't like the idea of a remote that I could misplace so I opted for the CETE.
With CETE or RENNtech, the purpose is largely to fully open the exhaust values when they are opened. From the factory they have been limited (moreso in the 2020 models). In the factory 2018 I have, during a cold start, the exhaust values will be default open similar to the EVM settings (100% vs <100%), and then once oil is distributed through the motor and an acceptable temp is reached, they close (usually about a minute).
For the CETE module, it changes that - the default cold start opening is over-ridden and the EVM is controlled via the button or engine settings only - so it always starts with valves closed. I'm not sure how the RENNtech works during cold starts, not to be confused with regular operation. For me, I didn't like the idea of a remote that I could misplace so I opted for the CETE.
I have the renntech and cold starts and warm starts are significantly louder with the module. That being said, even with the module on, in Race and S+ mode it idles louder (both cold and warm) than in C. 99% of the time I have it set to always open and leave the remote in the center console so not really worried about losing it. I agree with a previous poster, without the module warm start ups are kinda embarrassing for a car of this caliber (luckily Renntech/ASR fixes that.)
I'm not sure how the RENNtech works during cold starts, not to be confused with regular operation. For me, I didn't like the idea of a remote that I could misplace so I opted for the CETE.
It never closes the valves when you use the ASR/renntech module. I'm also hoping this eliminates the potential for the stuck closed valve error that has crippled some people's cars. Like doulehr, I just leave the remote in the center console and never touch it.
Sorrry maybe I didn't explain it well. Regardless of what EVM you have the car always starts in COMFORT mode. With the Renntech EVM, the car will stay int he setting you have the EVM set to you. So the car will start in comfort mode but the vales will be open so it'll be louder. That being said, you can tell it idles significantly louder when you switch it to RACE mode rather than comfort...even with the EVM.
I wonder why it would be louder in race mode. The EVM is supposed to keep the valves 100% open and you can't get opener than 100% can you? ;-)
That said, Its obnoxiously loud on start up with the valves 100% open (not to be confused with the stock setting open on startup like it comes from the factory). I opted for the Cete - I just wanted the option to decide whether I want to wake up the neighbors or leave the house without the fanfare.
Is there a US vendor for the Cete EVM? If not, did ordering it from overseas present any unexpected costs or issues?
Is there a US vendor for the Cete EVM? If not, did ordering it from overseas present any unexpected costs or issues?
ordering direct from Cete was easy - once you enter your shipping information they automatically pull out VAT. It took about a week to arrive and no fuss. Works great!
Perhaps the turbo vanes are open more in Sport+ and Race mode over the other modes.
Certainly not an expert in the turbo field; however, I was lead to believe that if a setup has a wastegate (the GT-R and GT-C turbos have a wastegate) it doesn't operate as a VGT.
Just ordered from the EVM from CETE, I like the fact the original switch controls it, rather than a key fob.
Hope to see it in a week unless customs decides to play games with the shipment.
Just ordered from the EVM from CETE, I like the fact the original switch controls it, rather than a key fob.
Hope to see it in a week unless customs decides to play games with the shipment.
Just realize that your default starts in 'C' mode...so your start ups will be the same as stock.
Just realize that your default starts in 'C' mode...so your start ups will be the same as stock.
So the valves don’t stay open as “always” until I switch them off?
That’s what you’re saying. If so then the Renntech one is better because of the key fob function? The CETE one is basically the same thing as Renntech without the key fob and uses the factory switch. I think both of them will start in C mode regardless of the EVM.
Correct me if I'm wrong: With Renntech, the control changes the valve between 100% open and factory (when off, the factory control acts normally).
The Cete control changes the valve between 100% open and 100% closed. No middle ground.
@DriveAMG has the RENNtech module - question is does the RENNtech override the button, or just allow you to switch between factory settings (<100%) and the EVM setting (100% open). Second question is does it, like the CETE module override the 100% open setting during cold starts?
I believe the difference is that RENNtech allows you to turn off the modification vs CETE is just hardwired. @BBS63 cold starts under factory settings last about 20 seconds or so and as a previous comment said, we all start in 'C' so valves are closed.
has the RENNtech module - question is does the RENNtech override the button, or just allow you to switch between factory settings (<100%) and the EVM setting (100% open).
When set to fully open, neither the exhaust button nor changing modes does anything to the valves. I also just noticed that the Renntech version of the ASR module is missing the silent option, which completely closes the valves.
My GTC is very loud on cold startup in C. Always was hopeful always will be. When I installed the EVM I noticed a bit more bark in the volume on cold startup. That said I can only tell if it’s on by going back to C and playing with the button on the remote as the car is pretty loud all the time anyways.
To answer the other question, the valve button on the centre console still works because it only controls the valves in the mufflers. The module opens the centre valve that opens in Race all the time leading to the additional volume at idle and around town. Hope that helps.
To answer the other question, the valve button on the centre console still works because it only
controls the valves in the mufflers. The module opens the centre valve that opens in Race all the time leading to the additional volume at idle and around town. Hope that helps.
What center valve are you referring to? I'm almost certain there are only 2 valves that either direct the flow into the muffler or allow the exhaust gasses to bypass the muffler.
Here is the exhaust from the GT/S/C, and the R:
Quote:
Originally Posted by BBS63
Ok, I’m confused. So what do the valves do that the standard switch doesn’t do ?
Whats the point of these modules if at start or 20 seconds later if still in C mode the valves close?
The EVM keeps the valves open 24/7. When you start the car after it's already warmed up it has a tendency to start with the valves closed for some reason, leading to quiet starts when out and about. That no longer happens with the EVM installed. Also, unless you are in Race AND pushing the car past a certain RPM threshold, the valves never fully open without the EVM. So the EVM makes the car louder throughout the entire rev range.
Thought I read somewhere there was a centre flap somewhere that opened under full throttle
in race mode. Your probably right then as I’ve never really paid much attention to the exhaust system. Makes sense. Sorry for the mistake.
Thought I read somewhere there was a centre flap somewhere that opened under full throttle
in race mode. Your probably right then as I’ve never really paid much attention to the exhaust system. Makes sense. Sorry for the mistake.
No worries, you had me second guessing myself for a second there. What they were talking about is what I described in the second part of post, where the valves will never fully open, stock, even in Race, until pushed past the RPM threshold, that I believe is 4500 rpm.
I appreciate the explanation. That’s what I assumed it did otherwise there would be no point in having the module.
Quote:
Originally Posted by Orcbolg
What center valve are you referring to? I'm almost certain there are only 2 valves that either direct the flow into the muffler or allow the exhaust gasses to bypass the muffler.
Here is the exhaust from the GT/S/C, and the R:
The EVM keeps the valves open 24/7. When you start the car after it's already warmed up it has a tendency to start with the valves closed for some reason, leading to quiet starts when out and about. That no longer happens with the EVM installed. Also, unless you are in Race AND pushing the car past a certain RPM threshold, the valves never fully open without the EVM. So the EVM makes the car louder throughout the entire rev range.
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
What they were talking about is what I described in the second part of post, where the valves will never fully open, stock, even in Race, until pushed past the RPM threshold, that I believe is 4500 rpm.
