G25/G27 hybrid shifter (G27 w/Sequential!)

[Eric.]

I posted this in another thread earlier but thought it would be worth mentioning here. Follow along if you have a G25 shifter with failing pots and don't want to give up sequential functions.



I bought a G27 shifter on eBay to replace my G25 shifter. Somebody at iRacing told me they were plug and play compatible. Turns out its not quite the case. BUT, you don't need to do any rewiring since you have a G25 shifter as well.

Here's what I just did to make a hybrid G25/G27:

Disassemble both shifter units. Disconnect all the wires from the circuit board. We're going to reuse the bottom piece of the G27 including everything inside the bottom. Okay, one exception, remove the wire coming out of the G27. Next, with the G25 unit, remove the metal plate that goes under the knob to change shifting modes. Be careful as the sliding mechanism under it will want to pop up and the springs will come out. So hold that thing down and be ready to take that out (its two sliding pieces overlapping, hold them together when you take it out). You'll also need that switch.

Install those three parts (switch, then sliding mechanism, then the plate) into the G27 base. Remove the G25's cord the same as you did for the G27 and swap it into the G27. Finally take the top half of the G25 and put it onto the G27 base after making all the connections.

The result:

G27 base and H-shifter mechanism
G25 sequential mechanism
G25 wiring harness
G25 top w/circuit board.

And you've just made a G27 with sequential functions, for $35.




Where to buy a G27 shifter?

ebay: http://www.ebay.com/itm/Logitech-G2...ultDomain_0&hash=item415f444325#ht_500wt_1413

(Bought mine from that seller. Offered $20 and he counteroffered $30. I've heard he has accepted $20 before).

Logitech: http://buy.logitech.com/store/logib2c/en_US/DisplayCategoryProductListPage/categoryid.53321900

 

[Gdog96]

Does the shifter have the resistance of the g27 or g25?

 

[Eric.]

Everything is just like the G27, but with the sequential mode available.


Edit: The only minor fault is the sliding mechanism is just barely in the way of where the shifter goes for 1st and 5th gears. There's no problem using those positions, but the throw is stopped just a little bit short and it feels just a little different there. You'd never know it was happening.

 

[fatkrakr]

Great info here thanks. I wonder where he gets all them shifters from? Also I think that logitech parts section is new. Never seen that before.

 

[Gdog96]

Great info here thanks. I wonder where he gets all them shifters from? Also I think that logitech parts section is new. Never seen that before.

Me niether..

 

[Eric.]

Have no clue about the ebay seller but he and the product are legit. Somebody at IRacing posted up the logitech link about a week ago.

Also, it could be worth trying this with a G27 wheel. You would keep the G27 cord installed. I wouldn't expect it to work, but if someone has a g25 shifter collecting dust it could be worth trying.

 

[MozzMann]

https://www.gtplanet.net/forum/showthread.php?t=222925

 

[chronowarp]

I spent a few hours trying to get this tidbit to work, so I thought I'd share my observation and as a cautionary tale:

I got a G27 shifter from ebay and tried to transfer the sequential hardware and wiring from my G25 shifter. What I found is a dependency with the pot and circuit board that breaks the shifter:

G25 circuit board + G27 base -> pot doesn't travel far enough to register 5/6/reverse. I know because if I twiddle the stick really far to the right, I can get intermittently get gear 5/6. The forward/backward travel had a bigger deadzone than the G25, so sequential shifting didn't work either, because the limited travel wasn't insufficient to trigger a shift.

G27 circuit board + G27 base -> H-shifter works fine. Board lacks the sequential shifter connection.

Given the circuit diagrams suggest the POT connections go straight to the DB9 connector, I'm at a loss why the circuit board makes a difference. But given that it's "almost there," I think the success of this hack depends on the manufacturer variance of the board/potentiometer components.