RoadrunnerGTS

It does ARM on upshift, but apparently only within a certain time frame. If you hold the clutch in for perhaps more than 2 seconds, then it won't ARM on upshift. I often notice it most on 2nd to 3rd, although it is subtle vs downshift ARM.

AdamIsAdam

I guess I shift too prefect to notice. 😉
Actually I'll check it next time I'm out.

85Gold

What's this ARM you speak of.

Peter

RoadrunnerGTS

I have only noticed it in casual driving around town from 1st to 2nd, and 2nd to 3rd. My guess is it aims to make for a smoother upshift.

Info here:
Post 8 & 9: https://www.planet-9.com/threads/rev...gimmic.100210/

https://rennlist.com/forums/718-gts-...2-upshift.html

UncleDude

Just tried in mine, could not detect any throttle being added in shifts 1-2 or 2-3.

RoadrunnerGTS

Mine only does it sometimes in certain scenarios. I will try to isolate what those are. From memory it is a slow change from 3500 in typical casual city driving from 2nd to 3rd that I have noticed it most. It is easy to miss as it is subtle. It is more obvious with VC and valves open.

TXshaggy

Just spitballing here, but if you spend enough time in the 3/4 neutral gate your “upshift” is the same as an auto blip downshift.

The GT4/Spyder OM specifically states auto blip is a “downshift” feature.

RoadrunnerGTS

Agree what the OM says, but I find Porsche OM's are lacking information for the most part when requiring more detailed information.

From research I did, ARM is simply attempting to match the target gear, it doesnt care what gear you are coming from, up or down. Example, 5th to 3rd down or 2nd to 3rd up, key is to match required revs for 3rd. That said, with 718 long ratios, it would be odd for it to need to ARM on an upshift as revs would typically be above target still.

Porsche basically copied Nissan's ARM in the 370Z, and that Nissan states SRM/ARM is used on all gear changes, up or down. Here is info on Nissan's SRM (ARM) https://www.caranddriver.com/feature...tch-explained/

I know that the BMW M2 does rev matching up or down.

It would be great if there was more info available on this. I'd also like to know how DeMan maintains ARM when changing the ratios and not updating any of the software.

TXshaggy

The article you linked essentially repeated what I said. If you delay long enough it’s an auto blip up. Had the same in my Z06.

bob78h

I usually drive with rev match on.

I guess the problem is, the grinding happens so rarely and randomly that it's hard to know whether ARM is the cause or not. For me, it at least seems unrelated to shifting speed or revs. I've had it happen shifting quickly and shifting slowly. And for sure I have the clutch all the way down, so I hope operator error isn't a factor.

Westcoast

Automatic Rev Matching

Westcoast

It has be reported that Auto Blip remains in play with a DeMan gearset installed.

85Gold

You mean like Heel and Toe.

Peter

Westcoast

If that is you and your car pictured in the lead then you probably don't need ARM... and prefer heel and toe!

85Gold

It is funny to me about all the Purists who want a manual transmission experience and then the 1st thing they do is turn on ARM. Not saying 2nd gear grind isn't real. I had it on one of my 6GT3 when the tranny was cold. Cold trans fluid and speed shifting can beat the synchros on most cars.

Peter