Accelerator Module

I made one!

Based on the thread over on Pelican Parts, I followed the destructions and bought the bits from Maplins and assembled this the other day:

r12sElectrikery.jpg


It has a variable pot to alter the resistance - inside is a fixed 10K Ohm resistor with a variable 20K Ohm one - so I can alter the resistance manually from 10K to 30K by rotating the knob thingy. The switch simply allows me to by-pass the thing entirely in the event I want to disable it for whatever reason. The tacky sticker I bought at the NEC last year.

This was a doddle to build - it cost me £7 in bits and half an hour behind a soldering iron. I haven't tested it yet as I'm waiting for the weather to warm up a bit. I'll let you know how I get on!

Cheers,
Fin.
 
Well done Fin! Lovely job but series resistance maybe a bit high, you need access to a GS-911 to see what affect its having. I’ve been looking for a source of the plugs for a month, where did you find them??
 
Cheers Ebbo.
According to AndrewA on the thread at Pelican Parts, the optimal resitance value is 23K Ohms - this drops the temperature by around 25 deg C.

It's why I went for a variable system where I could alter the resitance values and make my own determinations. I figured from 10 to 30 k Ohms was a good range. It's also what AndrewA has used on his prototype. I'm thinking about getting a GS-911 as I've got an 1150GS and a 1200S, so it's sure to be useful. I'm still paying off the credit cards from crimbo though, so it may have to wait a bit.

Like you, I had an awful job trying to track down the Bosch EV1 connectors, but a local automotive supply outfit (Bennetts) do a Unipart equivalent which fits perfectly. I'm sure you'll have someone near you that can supply these.
Theyre about £1:50 each.

Good luck and let me know how you get on!

Cheers,
Fin.
 
Finbarr said:
Good luck and let me know how you get on!

Cheers,
Fin.
Click to expand...
Will do,


Unipart! Just goes to show the internet can’t find everything doesn’t it!

Jens of BoosterPlug fame say 20c lower than ambient will get you 6% extra fuel and that’s the way to go, I quite fancied a 25k pot, but that’s where the GS-911 comes in of course, pity you don’t live locally, we could have tried yours out (very neat job too)

Guess I’ll have to go shopping now, find plugs, new soldering iron, Maplins…

Thanks Fin ;)
 
after following with much interest this thread and the one on the pelican site. i have tested fixed and ntc resistors and found i can achieve -22c below ambiant temperature with a 15k ntc thermistor from maplins at 69p ,this is in place of the ait and not in series. i have tested it at temperatures from 1c to 17c with gs 911. if -22c is not enough a 20k ntc will make it a bit colder still . if i was going to do this conversion i would buy a new ait sensor and replace the ntc thermistor within
 
Heli450
What great idea!

Not being particularly good at electronics, I had to read your post about five times and do a Google search to find out what an NTC thermistor is, before I really understood where you're comuing from - but now I get it - very elegant solution indeed.

I may well try that and ditch the box under the seat that I made.
Many thanks for sharing!

BTW, what value does the AIT thermistor have by default?
When you say swap out the AIT for the 15K NTC to go -20, I'm assuming here that the AIT doesn't drop the temp at all, that it's an actual measurement with no compensation?

Cheers,
Fin.
 
fin
my ait measures 5.7k at 25c
you are adding more resistance to fool the ecu
 
heli450 said:
after following with much interest this thread and the one on the pelican site. i have tested fixed and ntc resistors and found i can achieve -22c below ambiant temperature with a 15k ntc thermistor from maplins at 69p ,this is in place of the ait and not in series. i have tested it at temperatures from 1c to 17c with gs 911. if -22c is not enough a 20k ntc will make it a bit colder still . if i was going to do this conversion i would buy a new ait sensor and replace the ntc thermistor within
Click to expand...
Hi Heli450, in testing of the 15k NTC thermister, how close to an even 22c set back did you find you had over the 1c to 17c range and have you actually replaced the IAT thermister in the airbox with the 15k?

Wonder what the temperature response is like above 17c...
 
ebbo
i have not fitted it only tested to see what happens
here"s my results

standard ait ntc thermistor 15k ait+10k resistor

reads reads--difference reads -- difference

1.5c -20.3 = -22 -14.3 = -16
5.3 -15 = -20.5 -12.8 = -18
9.8 -12 = -22 -12 = -22
12 - 9 = -21 -10.5 = -22
15 - 6.8 = -21.7 -9.8 =-25
17.3 -5.3 = -22 -9.8 =-27

i have nt gone above 17.3 ,garage is bit cold. i will test higher temperatures when it warms up a bit
as you can see by adding a fixed resistor in series the value is not constant with changing temperatures.
you need to find out what size resistance gives the results you like.
what finnbar has done will enable him to adjust the resistance to suit him and the bike,then if he measures that resistance he be able get a ntc thermistor to match .
i would like to add that i am not an expert only tinkering ,there is a lot of information about this on various forums and people selling products
 
standard ait-------ntc thermistor 15k-----------ait+10k resistor

reads--------------reads/difference------------ reads/ difference

1.5c---------------/ -20.3 = -22------------------/ -14.3 = -16
5.3----------------/ -15 = -20.5-----------------/-12.8 = -18
9.8----------------/ -12 = -22 -----------------/ -12 = -22
12-----------------/ - 9 = -21 -----------------/ -10.5 = -22
15-----------------/ - 6.8 = -21.7 ---------------/ -9.8 =-25
17.3---------------/ -5.3 = -22 ----------------/ -9.8 =-27

hope that"s a bit clearer
 
Er......... actually............no!

Well you did ask !

Maybe it's clear to electricians, but I just ride my bike :aidan
 
Heli450,
Those are very interesting values! And thank you for reposting, the first set were a bit hard to read.
The 15K NTC provides a much closer averaging or clustering of temperature values when compared with the simple 10K resistor. That seems not only non-linear, it's actually a bit random!

I was thinking about putting the box I made up on the handlebars so that I can tweak it easily between test runs. I need to do some voltmenter calibrations and mark up the box with resistance values too...

One thing I've read is that the ECU smooths out sharp temp changes so either an ignition reset is required or a wait of 30~40 seconds for the new temp value to have an effect on the fueling.

I have to say, I can't wait for summer - the anticipation is driving me nuts!

Cheers,
Fin.
 
heli450 said:
standard ait-------ntc thermistor 15k-----------ait+10k resistor

reads--------------reads/difference------------ reads/ difference

1.5c---------------/ -20.3 = -22------------------/ -14.3 = -16
5.3----------------/ -15 = -20.5-----------------/-12.8 = -18
9.8----------------/ -12 = -22 -----------------/ -12 = -22
12-----------------/ - 9 = -21 -----------------/ -10.5 = -22
15-----------------/ - 6.8 = -21.7 ---------------/ -9.8 =-25
17.3---------------/ -5.3 = -22 ----------------/ -9.8 =-27

hope that"s a bit clearer
Click to expand...
Thanks for taking the time to type that up heli450, your second go reads just fine.

The linearity of your readings with the 15k thermistor against ambient temperature is very encouraging, it looks like I have more shopping to add to my list, thanks for posting that up. If I can get the bits together I’ll run a test myself and report back.

Martin
 
15k Maplin thermistor test results

From my tests it looks like a simple 15K Maplin thermistor is a possibility, at least if you ride between 0c (freezing) and 25c, but it certainly doesn’t give a nice flat temperature response as the BoosterPlug or Accelerator module should. Beyond 25c fuelling may become a little too rich, but without trying it , its hard to say. It’s certainly a whole lot better than a simple resistor in place of the IAT sensor, and lots of people are riding around with one of them.

One bodge DIY option to extend the usable temperature range of the 15k thermistor maybe to add a series resistor you can switch out for those days when the temperature gets close to 25c or over, sort of a high/low setting if you like.

Interpretation of the figures:
If fueling is increased/decreased by 3% for every 10c temperature change…
At an ambient 0c It just fell short of 6% extra fuel with 18c setback, 5.4% extra fuel
At an ambient 8c I had 20c setback equaling an ideal? 6% extra fuel
At an ambient 15c I had 22.5c setback giving 6.75%
At an ambient 20c I had 23c setback giving 7% extra fuel
At an ambient 25c I had 25c setback giving 7.5% extra fuel
At an ambient 30c I had 26.2c setback giving 9% extra fuel

Really, what your hoping for is a nice even 20c all the way down the last column labeled 'Setback' to give you 6% extra fuel.
 
I don't understand why you lot are trying to build your own? The accelerator is only £29 :blast

It's not expensive and save all the hassle! Unless you like playing?
 
ph4824 said:
I don't understand why you lot are trying to build your own? The accelerator is only £29 :blast

It's not expensive and save all the hassle! Unless you like playing?
Click to expand...
Curiosity :D
 
Nippy Normans supply Touratech, Wunderlich, Desert Fox and many other makes of accessories.
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