Adjusting the Fuel Injection

[GMP]

You can't just disconnect the TPS on an EFI system. It needs to be reconnected and the TPS referance reset in the ECU. It undoubtedly threw an error code for the TPS. Basically the TPS is a potentiometer (variable resistor), on the throttle body and provides a voltage output proportional to throttle position. The ECU has an onboard ADC(analog to digital converter) that converts this voltage data and uses it(and other inputs) to determine fuel mass for injection, which is done by adjusting injector pulse width. When you "reset the TPS", what you do is store the value of this voltage data in the ECU when the throttle is closed, or a predetermined and mechanically set angle. This is now the referance point.

The Technoresearch software/cable is only $200 and worth it if your going to keep and maintain the bike. An AFR meter is nice but not a must have, you can tune trim by feel just like jetting the pilot circuit on a carb. Trim has little to no effect at larger throttle openings.

[Crankin04]

Hey GMP,

I have a 04' GG FSE 450 and I bought the technoresearch VDST and cable, got it hooked up to my GG and everything working. Adjusted fuel trim to about 45 and it's running great there. The only thing I need to do now is reset my TPS.

Is their a simple way to do this, or a specific procedure? When I hook the ECU to the cable and bring up the software, I can go to the Adjust Settings section and it shows TPS, and I can click it and it will electronically adjust it. Is that all I need to do and follow logical instructions after that, or something mechanically too?

Thanks for your help!

Crankin04

[GMP]

My VDST experience is on a Ducati with an idle air control stepper (no user mechanical idle speed/throttle angle control). If the FSE is like this then yes, you are correct and done. If the bike has a screw adjustment for throttle angle/idle speed, then its quite possible that this will have to be backed off completely or set within a range of degrees on the VDST display before the reference is taken (TPS reset). My Cannondale was like this. Too bad VDST doesn't display the current TPS reference like the Optimum Cannondale software did.

Sorry I have no specific '04 FSE experience, I hope someone here with an FSE can comment.

[Crankin04]

Originally Posted by GMP

My VDST experience is on a Ducati with an idle air control stepper (no user mechanical idle speed/throttle angle control). If the FSE is like this then yes, you are correct and done. If the bike has a screw adjustment for throttle angle/idle speed, then its quite possible that this will have to be backed off completely or set within a range of degrees on the VDST display before the reference is taken (TPS reset). My Cannondale was like this. Too bad VDST doesn't display the current TPS reference like the Optimum Cannondale software did.

Sorry I have no specific '04 FSE experience, I hope someone here with an FSE can comment.

So I have hooked up the technoresearch VDST software and increased my fuel trim a little bit (was at 22 now at 35, then tested at 40, 42, 45) and also reset my TPS using the Buell procedure and it said PASSED.

I also had my valves checked a couple months ago and all looks good according to the service shop that did so. Made sure their's plenty of Gas and my bike battery has full power and fully charged, but I still cannot get my stupid bike to start cold. And if I do, it's like almost an hour later

What the heck else can I try? I thought the TPS Reset was supposed to help with this...?

Thanks for help.

Crankin04

[bergerhag]

How do you go about a cold start? Proper procedure would be: key on, wait until fuel pump stops. Give it a short burst on the starter, only a few revs. if it wont fire, release button and start over. And do try he WOT start too, it works.

[Crankin04]

Originally Posted by bergerhag

How do you go about a cold start? Proper procedure would be: key on, wait until fuel pump stops. Give it a short burst on the starter, only a few revs. if it wont fire, release button and start over. And do try he WOT start too, it works.

Hey Berg,

What do you mean by the "WOT" start too?

[Nick]

Wide open throttle

[Lipilape]

Originally Posted by GMP

You can't just disconnect the TPS on an EFI system. It needs to be reconnected and the TPS referance reset in the ECU. It undoubtedly threw an error code for the TPS. Basically the TPS is a potentiometer (variable resistor), on the throttle body and provides a voltage output proportional to throttle position. The ECU has an onboard ADC(analog to digital converter) that converts this voltage data and uses it(and other inputs) to determine fuel mass for injection, which is done by adjusting injector pulse width. When you "reset the TPS", what you do is store the value of this voltage data in the ECU when the throttle is closed, or a predetermined and mechanically set angle. This is now the referance point.

The Technoresearch software/cable is only $200 and worth it if your going to keep and maintain the bike. An AFR meter is nice but not a must have, you can tune trim by feel just like jetting the pilot circuit on a carb. Trim has little to no effect at larger throttle openings.

Hello, good, I'm new here but with old problems my name is victor and I'm from Girona I have a 2006 fse and it's giving me a bag I had a 2006 map and from one day to the next it didn't want to go anymore I opened the engine I put piston rings and everything his and nothing managed to go wrong but well I did not change 4 tps I have put as they say from zero to 290 reset and it drops to 4.74 and 63 in the 2 maps and with the 4 tps I have changed the map I have mounted the 2007 and exactly the same to 2006 it does the same to me any idea?



Quoteg