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 Cheapest DIY Servo Bypass

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SheWolf
Alpha Rider



PostSubject: Re: Cheapest DIY Servo Bypass   Fri Jan 20, 2012 6:52 pm

Yeah, I read it. Until I see more concrete proof, I still hold firm that my little free resistor mod gave me what I needed (as have others who have done it). Remember From what I've seen, with my own use and also following Dr Steve's build, the servo resistor and Graves plug do the same job. I have yet to see someone that's taken one of those plug n play units apart to see exactly what's involved. :hmmm:

_________________
A wolf's voice echoed down the mountain 'Share the bounty of the hunt with your brothers and sisters, and forever be strong and free.'
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motokid
Moderator



PostSubject: Re: Cheapest DIY Servo Bypass   Sat Jan 21, 2012 4:27 am

SheWolf wrote:
Yeah, I read it. Until I see more concrete proof, I still hold firm that my little free resistor mod gave me what I needed (as have others who have done it). Remember From what I've seen, with my own use and also following Dr Steve's build, the servo resistor and Graves plug do the same job. I have yet to see someone that's taken one of those plug n play units apart to see exactly what's involved. :hmmm:

If you look at Steve's design it uses resistors.

There's no other way for the graves expensive pos to accomplish what it does without using resistors.

The 5 cent trick.........................uses a resistor.

The main debate though would be does the servo actually send information back to the ECU or is that just a one-way street?

Something comes from the ECU to tell the servo to move the EXUP one way or the other. Does the servo then send anything back to the ECU?

I'd be shocked to hear that it does. Not sure why it would.

If no information is being relayed back to ECU from servo, then any claims to increased power or performance regardless of how you alter the servo are simply wishes in the wind.

I would also assume that if the Graves piece has any performance advantage it would be advertised heavily. We've all spent lots of money for more performance.
Here's the description from Graves:

Quote :
Graves Motorsports EXUP Servo Eliminator Yamaha R1 2002-2003 + 2007-2008, R6 2006-2012, WR250X/R 2008-2011 and FZ1 2006-2011.

Description: Graves Motorsports Universal EXUP Eliminator is a simple plug-and-play application that allows the removal of the EXUP valve and motor without setting the "Check Engine light" being activated when using a full racing exhaust. Furthers the weight savings after EXUP removal and allows for a cleaner appearance. It will eliminate error codes 17 & 18 ONLY.


No mention of any performance enhancing what-so-ever.


_________________
2008 WR250X
Gearing: 13t - 48t
Power Commander 5 / PC-V
Airbox Door Removed - Flapper glued - AIS removed
FmF Q4
Bridgestone Battlax BT-003rs
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SheWolf
Alpha Rider



PostSubject: Re: Cheapest DIY Servo Bypass   Sat Jan 21, 2012 6:11 am

My point exactly. thumb Simple. If it's simple, then there can't possibly be anything more than what's been done with the resistor. It does the same job the resistor does, just costs a helluva lot more.

_________________
A wolf's voice echoed down the mountain 'Share the bounty of the hunt with your brothers and sisters, and forever be strong and free.'
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DougZ




PostSubject: Re: Cheapest DIY Servo Bypass   Sat Jan 21, 2012 12:25 pm

I'll preface this post by saying I am no expert, and the only way to know for sure if the EXUP motor feedsback into the ECU and changes anything with fuel curve, would be to do a back to back dyno run( actual dyno..not butt dyno) with the resistor in and with the motor itself in.

This is my theory, based on what I think I know. Very happy

1. The Yamaha EXUP system, both on this bike and others, serves a two fold function. One is to lower exhaust noise at idle, and the second, and more important, is to increase torque at lower RPM. These motors, and the inline four design they are based off of, do not typically make a lot of power down low in the RPM range. Not a big deal when you have four cylinders firing. Bigger deal when you only have one cylinder.

2. Based on looking at the wiring diagrams, I think the "other" wires do not feed back into the ECU..but instead get further input FROM the ECU/ other sensors. The wires going to the motor, are also tied into the speed sensor and throttle position sensor. Being that you need the valve closed at lower RPM to make more torque, and more open at higher RPM to make more HP, it would make sense to have these sensors feed into the control of the motor. Almost like a PLC loop system.

3. Japanese do not typically make things more complicated than they need to be. Germans and British do enough of that.

4. CEL's are usually thrown when a sensor is not working. The ECU's only get the idea that something is not working, when it does not get the resistance back to the ECU. Only one set of wires is needed for that. Thus, why a resistor is only needed to connect two pins.

Conclusion: Based on what I mention above, I personally feel there is no difference between the resistor cheap fix and the Graves unit. My guess is that if someone smashed the graves unit, it would just be either one resistor, or a couple, still doing the same thing , and just tricking the ECU into thinking the motor was still there working, in place.
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motokid
Moderator



PostSubject: Re: Cheapest DIY Servo Bypass   Sat Jan 21, 2012 12:39 pm

Doug, there's a huge debate over what the EXUP does.

Many will side with the camp that it's ONLY an emissions and noise device.

It there was any power benefit at any place in the powerband why wouldn't race teams and aftermarket pipe manufacturers include such a device in their products?

Why wouldn't Honda and all the other companies utilize something of that nature?

I don't say you're wrong - just that there's wiggle room for much debate regarding the EXUP and what it does.

Which further complicates the idea that the Graves unit provides any performance advantage at all.

_________________
2008 WR250X
Gearing: 13t - 48t
Power Commander 5 / PC-V
Airbox Door Removed - Flapper glued - AIS removed
FmF Q4
Bridgestone Battlax BT-003rs
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DougZ




PostSubject: Re: Cheapest DIY Servo Bypass   Sat Jan 21, 2012 12:49 pm

Racing is not apples to apples comparison, since they are never interested in the lower part of the RPM range, to put around at low speed. High speed, high power, high RPM is typically what they are interested in.


Not that Wiki knows all, but makes sense to me:

http://en.wikipedia.org/wiki/Four-stroke_power_valve_system
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motokid
Moderator



PostSubject: Re: Cheapest DIY Servo Bypass   Sat Jan 21, 2012 12:57 pm

As I said....it's a debate....... Very happy

_________________
2008 WR250X
Gearing: 13t - 48t
Power Commander 5 / PC-V
Airbox Door Removed - Flapper glued - AIS removed
FmF Q4
Bridgestone Battlax BT-003rs
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Heoz




PostSubject: Re: Cheapest DIY Servo Bypass   Sat Jan 21, 2012 5:28 pm

DougZ wrote:
...
2. Based on looking at the wiring diagrams, I think the "other" wires do not feed back into the ECU..but instead get further input FROM the ECU/ other sensors. The wires going to the motor, are also tied into the speed sensor and throttle position sensor. Being that you need the valve closed at lower RPM to make more torque, and more open at higher RPM to make more HP, it would make sense to have these sensors feed into the control of the motor. Almost like a PLC loop system.

3. Japanese do not typically make things more complicated than they need to be. Germans and British do enough of that.
...
Conclusion: Based on what I mention above, I personally feel there is no difference between the resistor cheap fix and the Graves unit. My guess is that if someone smashed the graves unit, it would just be either one resistor, or a couple, still doing the same thing , and just tricking the ECU into thinking the motor was still there working, in place.
Not that it really changes anything... I believe the "other" wires you were refering to (BL & L) are actually just 5V power and ground. That conclusion is based on those same wires applying power to the TPS. The TPS output depends on those wires supplying steady voltage. Makes me wonder if you just threw us (Americans) under the bus with the Germans and British wink

My theory on it is that the BL, L & W/R wires function basically just like the TPS except, that instead of it measuring the throttle position, it's measuring the position of the servo motor. If that's accurate, then the W/R wire gives motor position to the ECU. Does the ECU actually use it for anything other than possibly throwing a code 18 (stuck motor)? I have no idea. A good hardware hacker could probably give us a definitive answer. No, I'm not suggesting that someone should hack the ECU, just stating one way that we could get an answer. Dyno test would still provide the best answer IMO.

Now for the fun part: making an assumption about the way the ECU controls the motor and based on the way the "cheap" servo eliminator is connected, it could very easily provide feedback to the ECU that would look exactly like the servo feedback. I'm thinking it should be called the elegant servo eliminator instead of the cheap servo eliminator.

A side note for Motokid, I have a Honda Firebird (CBR) that has an EXUP. According to this wiki page: http://en.wikipedia.org/wiki/Four-stroke_power_valve_system , there are other names for them like HTEV & H-VIX.

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motokid
Moderator



PostSubject: Re: Cheapest DIY Servo Bypass   Sat Jan 21, 2012 5:46 pm

yep...I saw that. Thanks.

_________________
2008 WR250X
Gearing: 13t - 48t
Power Commander 5 / PC-V
Airbox Door Removed - Flapper glued - AIS removed
FmF Q4
Bridgestone Battlax BT-003rs
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DougZ




PostSubject: Re: Cheapest DIY Servo Bypass   Sat Jan 21, 2012 6:54 pm

Here is that link I posted, incase you missed it. horse cheers

http://en.wikipedia.org/wiki/Four-stroke_power_valve_system
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Heoz




PostSubject: Re: Cheapest DIY Servo Bypass   Sat Jan 21, 2012 8:46 pm

Guilty as charged. Sorry about that! To top it off I called the crotch rocket a firebird when it's actually called a fireblade. Shog

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DougZ




PostSubject: Re: Cheapest DIY Servo Bypass   Sun Jan 22, 2012 4:00 am

LOL..it's all good.
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gatorfan




PostSubject: Re: Cheapest DIY Servo Bypass   Sun Jan 22, 2012 4:09 am

motokid wrote:


Why wouldn't Honda and all the other companies utilize something of that nature?


They do, but have different names.

Good pickup with Yami making NO POWER CLAIMS with Graves mod.

If we conclude from this that Graves vs Servo has no performance difference. And if we conclude resister vs Servo has no performance difference (based on multiple butt dynos) than that means TwilightZone has picked a correct internet handle to go by. poser2






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Marylucky




PostSubject: Re: Cheapest DIY Servo Bypass   Mon Jan 23, 2012 10:36 am

SABMATIN wrote:
Hello all! I found this sweet little tid-bit while surfing the web today.

http://www.yamahafz1oa.com/forum/showthread.php?t=109692
Has a post for a plug that would mate up with the male plug when you unplug the EXUP servo.





6 Position .090 Waterproof Connector Female Half.

Fits wires from .5mm - 1.25mm (22 - 16 AWG).

Tough plastic housing with inner seal. Seals on each wire.

Used for ExUP Connector on some Yamahas.
RFW 6P090-Female


6 Position .090 Waterproof Connector Female Half.

Fits wires from .5mm - 1.25mm (22 - 16 AWG).

Tough plastic housing with inner seal. Seals on each wire.

RFW 6P090-Female

http://easternbeaver.com/Main/Elec__...FKWH/fkwh.html

You can use this to connect the SheWolf resistor fix. YOU MUST ORDER 3 to get the base price over $20 or the shipping will be around $300.... If you order 3 the shipping and total is only $25

Must be an issue shipping from China. I believe I may do this, do the SheWolf resistor fix and then fill the open end of the plug with Silicone. That way it is waterproof and quickly unplugged if stock parts need to be reinstalled.

Not sure if we need the Male or the Female half? What do you all think?



cheers

Hey guys, I want this connetcor but when I go to the web site it says : 306$ for shipping !!!! do you know an other place to buy it without this shipping price ?
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TwilightZone




PostSubject: Re: Cheapest DIY Servo Bypass   Mon Jan 23, 2012 11:43 am

>"Good pickup with Yami making NO POWER CLAIMS with Graves mod.

If we conclude from this that Graves vs Servo has no performance difference. And if we conclude resister vs Servo has no performance difference (based on multiple butt dynos) than that means TwilightZone has picked a correct internet handle to go by."

Hmmm... Notice that I said that the peak power was the same. When the ECU bypass with the resistor comes on, yes it really comes on.
But I feel the power feed is changed in the low to mid-range of the power band. I guess other people could try the servo hooked up (or resistor plug) and resistor. Report back. Try it yourself... see what happens.

Only way for sure is if somebody finds out the ECU and mods... or do multiple dyno tests and examine the low to mid rage of the power band.

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motokid
Moderator



PostSubject: Re: Cheapest DIY Servo Bypass   Mon Jan 23, 2012 11:56 am

The EXUP valve is the absolute last part of the chain of events that happens in the intake, combustion, exhaust equation.

Why would the electronic brain that controls air-fuel mixtures and combustion and what-not care what happens at the EXUP valve?

By that time everything that could happen regarding combustion has already happened.



_________________
2008 WR250X
Gearing: 13t - 48t
Power Commander 5 / PC-V
Airbox Door Removed - Flapper glued - AIS removed
FmF Q4
Bridgestone Battlax BT-003rs
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rydnseek




PostSubject: Re: Cheapest DIY Servo Bypass   Mon Jan 23, 2012 2:20 pm

motokid wrote:
The EXUP valve is the absolute last part of the chain of events that happens in the intake, combustion, exhaust equation.

Why would the electronic brain that controls air-fuel mixtures and combustion and what-not care what happens at the EXUP valve?

By that time everything that could happen regarding combustion has already happened.



Another good point of logic.. Unless someone can come up with concrete evidence that it does more than send an error code to light the cel, i'm sticking with the conclusion that's all it does. Fool the cel anyway you want, the bottom line is no code thrown. Theories that it changes the idle mixture, headlight brightness, clutch freeplay, etc are just speculation & have no solid evidence to support it.

That said, IF someone can show a logical reason to think otherwise, or prove a connection, i'm all ears.
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duanew




PostSubject: Re: Cheapest DIY Servo Bypass   Mon Jan 23, 2012 2:21 pm

Marylucky wrote:
Hey guys, I want this connetcor but when I go to the web site it says : 306$ for shipping !!!! do you know an other place to buy it without this shipping price ?


My shipping quote was $347! eeek That is 50 times the price of the connector. :duh:
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Heoz




PostSubject: Re: Cheapest DIY Servo Bypass   Mon Jan 23, 2012 2:36 pm

Get the price of what you're buying up a bit and shipping will look a lot better. 3 of the 6P090 Female Half connectors and shipping is now showing $4.37.
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Marylucky




PostSubject: Re: Cheapest DIY Servo Bypass   Tue Jan 24, 2012 3:35 am

Heoz wrote:
Get the price of what you're buying up a bit and shipping will look a lot better. 3 of the 6P090 Female Half connectors and shipping is now showing $4.37.

Yeah I just send an email to him and he said to meet 20$ order to have a decent price
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