Jack_88

I would appreciate that. Outside of the flats, I can't really see a time I'd run into that limiter but I do hate being told what I can't do. 130, however, is definitely something I exceed on occasion, if I get on that flat, good road without traffic. If you've got a spot you can safely(by my definition, anyhow) test that, it'd be good to know as a fact.

mcguirja

Lol, I meant going into Star and changing Vmax to as high as possible. Unfortunately I don't have nearby road that will allow a run like this.

I have been able to determine my S class tops out at 130 so might be a place to start. It had more in it, but the limiter definitely kicked in.

Astro14

Where did you find that in Star? I've looked on my version, and can't find it...not that I plan to run 300 KPH, but it would be nice to know that the car isn't restricted...

tusabes

Limiter at 130 is for tires safety, in case you aren't running vzwy rated tires

Astro14

I understand why the limiter is in place for North America.

I was wondering in what module in DAS/XENTRY the parameter could be modified.

ZephTheChef

I believe there are actually two places that it needs to (or can) be changed, but it's been a while since I've been into all the variant coding menus. Plus, I'm using an Autel Maxisys tablet scanner/flash programmer so it probably reads/navigates a lot differently than what you guys are using.

ItalianJoe1

Somewhere in the ECU coding options, I don't recall exactly. I was scanning over them and saw one that said vMax, so I changed it. All the descriptions are in german so I don't know what order it's in or where on the list. I don't have the SDS laptop here at home to check for you either.

mcguirja

Try this. I've attached a link below as well with instructions. Haven't tested to see if it works.

Upgrading the speed limited in a gasoline (ME-series controller) engine control unit
Log on to DAS, connect to the car, select:
Control Units -> Drive -> ME-SFI 28 -> Development Data.
Then select the Control Unit Adaptations -> Explizite Kodierung

http://blog.obd365.com/2015/12/03/be...mode-achieved/

kraut56

usually only works with the engine running.

MRAMG1

I have had mine tuned over 4 years ago.
Nothing put perfection from the EC gang

I have never replaced the coil packs by the way, and I have road racced, drag raced and autocrossed this tank, LOL

Flight Test

If you do make it out to Bonneville please stop by our pit area and say hello. If the politicians can get everything sorted out on the salt I will be there in August for Speed Week.

Jack_88

Well, I can't make Bonneville this year, but I'll do my best to make it happen next year. I think I've decided I will do a tune, but only after I've done all the planned preventative maintenance and replaced the weepy ABC line. So, after she's gotten all her new fluids and filters, it'll be time to try to figure out the difference between what the different tuners offer.

Jack_88

All right, I know. I move slow. It's hard to pick a tune when you add 'drives like stock when not heavy in the throttle' to your requirements. I can't seem to find out who does and doesn't offer that. And I still haven't found any real reliability information. Anyone have a horror story? Or a long term success story?

ZephTheChef

Mine is still as blah as ever under half throttle. Eurocharged.

Jack_88

That's good news. Have you had it for long? Any surprises?

Jack_88

Anyone have a tune from Kleeman?

ZephTheChef

I got the tune about a month after getting the car (like May 2015). Took 6 months for my passenger side coil to die (original one at about 95,000 miles). We're another year along past that now and the remaining original coil is finally acting up. Other than that, (which probably would have happened not too much later on anyway), I have no complaints.

ZephTheChef

I would like to clarify that my misfire now is only happening if I accelerate pretty aggressively (say 2/3 pedal or more) and I haven't 100% verified that it is the coil but I believe it is.

tusabes

if it's blah at half throttle and misfires at 2/3 throttle , im confused why you've happy with that ?

ZephTheChef

I'm obviously not happy with the misfire. But that has nothing to do with the tune in my opinion. The fact that I'm running much higher boost than stock may well have revealed a developing problem with my aging coil sooner than would otherwise have happened but it would be a joke to say that it was the cause of it after a year and a half, as many people try to imply. By blah, I mean the car is predictable and not touchy or uncomfortable or in any way difficult to drive at lower throttle positions as a result of the tune. It will still outrun your average vehicle no problem, I just can't spin the tires from 60 right now.

Speedriven1

Sounds like what you want is a tune that will give you "full power" but not substantially alter throttle response. Any tuner that generates their own files (Speedriven, Renntech, Eurocharged, ... and maybe OE, I think?) should be more than capable of delivering that.

Jack_88

That's exactly it. My Dodge has a supercharger installed, and the thing that bugs me the most is the loss in linearity of the throttle since the install. In this case, it's more due to the supercharger being on a clutch, and the engagement causing a surge of power as opposed to a tuning issue. Still, it is a concern, since it's my daily driver, I don't want to sacrifice the pleasant nature of the car for the speed I'll use only occasionally. Having more power does make those odd occasions more fun, though.

ZephTheChef

Linear delivery isn't a problem with these baby turbos. In fact they come on so quickly that giving it full throttle at a point that causes a downshift will almost always result in wheelspin. But it's pretty progressive, it doesn't go from no power to all the power like a big turbo car does. Unless you floor it.

I was surprised you didn't think a supercharger delivered linear power until you mentioned it was on a clutch. Does it not have a boost bypass valve? I can't think of any good reason for a clutch on a SC if it has or can be modified to have a vacuum actuated recirculation valve. I have zero experience with a clutched one though. My twincharged car is a pleasure to drive with the SC hooked up, so much more linear and predictable. It's almost undriveable in turbo only mode...takes much more throttle opening to get moving and then the boost comes on too fast to get out of the throttle fast enough to prevent wheelspin. Whereas with the supercharger, torque is flat so power just goes up linearly with RPM, not exponentially.

Jack_88

The supercharger is from Magnuson, and it works quite well. Once engaged, it stays on for a short bit even when out of the throttle, so it doesn't make driving hard any real problem, but taking off in the rain on a slight uphill without wheelspin is actually a bit tricky. Either you are going quite slow, or you give it just a hair too much, on comes the boost, and the tires haven't a prayer of holding on. The benefit is that the car gets better fuel economy than the V12 Mercedes, giving me 15 city, 25 highway(sometimes better, if I keep it at 75.) At anything more than 1/4 throttle, the supercharger engages, and this in normal driving means you get a lot more power than you were trying for.

ZephTheChef

I thought most of their kits were a whipple or TVS, both of which I thought had a bypass valve. I had heard that the bypass valve actuator on the whipples is real twitchy like that and the eaton ones hit a lot gentler. I never found it to be a problem on my car because 20psi @ 1500rpm and 20% throttle is surprisingly underwhelming.