Add 11hp to your K75/100

[Burnszilla]

Injector upgrade:
http://autos.groups.yahoo.com/group/kbmw/message/5500

:thumb

[deilenberger]

Injector upgrade:
http://autos.groups.yahoo.com/group/kbmw/message/5500

:thumb

I'd love to see these. IF only it was this simple.. (spoken by someone who has a K75S where every-go-fast trick was used, and it still makes just as much power - on a dyno - as a normal K75.)

The larger-injector trick is about the same as the high-pressure fuel-pressure-regulator sold by several vendors some years ago.

I have personally dyno'd a K75 so equipped - and it still made the same power as any other K75.

Another way to accomplish the same thing (richen the mixture) for a lot less cost is simply to add a resistor in series with the engine temperature sensor and fool the computer into thinking it's not as warm as it really is. The computer will richen the mix thinking it's feeding a cold engine. I do know someone who did this years ago and claimed a noticeable (butt-dyno, which is notorious for giving the results you'd like to feel) increase in power.

I've been meaning to do this on THE K75S as an experiment - but hate hacking into a working wiring harness to do so. I tried making up a connector plug-and-play harness, but the end I can't find is the end in the temperature sensor. I bought a temperature sensor to disassemble for the connector, but it wasn't that simple. The plastic they mold the connector out of goes right down into the sensor probe, and no way to break the wiring out of it.

Be fun to try if I get around to it.. I do have a dyno I can use.

Adding to my own message: If you go look at the Ktech/yahoo group (I've been a member for years but rarely visit - I leave reality checks up to Brian Curry) - and look at the thread, you'll find several people questioning the results, and asking Greg for the dyno plots. He doesn't have the plots. They seem to have gone missing somewhere.

I'm still curious and may actually get around to it sometime this summer.. :brow

[beemerguru]

True, I lost the printouts somewhere over the last 10 years...but all 3 were done on the same dyno..and there was a LOT of separations between the lines.

Forgot the fact that I added this enhancement (snake oil) to 3 other K75s - one without telling the person. Every rider was surprised by the change. Instead of the usual K75 come on at about 4K rpms. the bikes now kicked in at about 3500 and ran stonger up to redline.

That's all I can say..tried it..liked it. http://www.bmwmoa.org/forum/newreply.php#
dunno

Greg in Foster City :dunno :dunno

[Burnszilla]

I went to the Ford dealer and purchased 3 injectors totaling $295.78. Installed them and went for a ride on highway 17 and Glenwood Drive. I was not impressed. The low end was gone and it just didn't feel as powerful as the stock ones. It seemed to have lost that pull in the corners when you hit the throttle. There was also a delay in the throttle response. In 5th gear going 90 mph I couldn't tell a difference. I got home and put the stock injectors back in, cleaned up the Ford ones and returned them this morning and got my money refunded.

Perhaps Greg is getting a different effect because of his larger bore K76?

[Cliffy777]

glad to learn the "rest of the story". i was gonna tell my sis-in-law about this idea for her k75, but not now.....

[deilenberger]

I went to the Ford dealer and purchased 3 injectors totaling $295.78. Installed them and went for a ride on highway 17 and Glenwood Drive. I was not impressed. The low end was gone and it just didn't feel as powerful as the stock ones. It seemed to have lost that pull in the corners when you hit the throttle. There was also a delay in the throttle response. In 5th gear going 90 mph I couldn't tell a difference. I got home and put the stock injectors back in, cleaned up the Ford ones and returned them this morning and got my money refunded.

Perhaps Greg is getting a different effect because of his larger bore K76?

Steve - thanks.

This is probably a case of YMMV. I imagine they could improve performance if your K75 was running lean for some reason (bad fuel-pressure-regulator, fuel-pump, fuel-filter or temperature sensor.) It sounds like your bike was running spot on and these made the mixture too rich. It might have something to do with the larger displacement of Greg's K76, but I'd suspect basic mixture differences are what is really happening.

Too bad you sent them back - would have loved to dyno them.. ;)