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gr4h4m

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Chester

13th Jun, 2014 at 06:31:20am

Hi all
Has anybody used a reliable switch that can switch a relay at a set boost pressure or higher.

I did use megajolt but the sc ecu doesn't support the feature. I have tried one of those mechanical switches in the nos kits but so far they have seemed a little unreliable.

Has anyone got any good ideas on how to solve it?

I want to switch a relay on at 5 psi to run the water injection pump.

Thanks for any help
Graham

I run a supercharger and I don't care the TB is on the wrong side.
VEMS + 12 PSI + Liquid Intercooler = Small Bore FUN!


wil_h

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Betwix Harrogate and York

13th Jun, 2014 at 08:26:11am

Can you use the boost control output and set it to 5psi?

Fastest 998 mini in the world? 13.05 1/4 mile 106mph



On 2nd Jan, 2013 fastcarl said:
the design shows a distinct lack of imagination,
talk about starting off with a clean sheet of paper, then not bothering to fucking draw on it,lol

On 20th Apr, 2012 Paul S said:
I'm mainly concerned about swirl in the runners caused by the tangential entry.


robert

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uranus

13th Jun, 2014 at 03:44:27pm

oil pressure switch ?

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

gr4h4m

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Chester

13th Jun, 2014 at 04:29:47pm



On 13th Jun, 2014 wil_h said:
Can you use the boost control output and set it to 5psi?


Ooooo Wil that might be very clever... I have the plug and the solenoid I guess one pin is neg and the other one positive? I will investigate tomorrow.
I guess you mean I could use the negative to switch the relay for the pump ?

I did ring sc but they never mentioned that..

Edited by gr4h4m on 13th Jun, 2014.

I run a supercharger and I don't care the TB is on the wrong side.
VEMS + 12 PSI + Liquid Intercooler = Small Bore FUN!


gr4h4m

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Chester

13th Jun, 2014 at 04:40:01pm




On 13th Jun, 2014 robert said:
oil pressure switch ?


Robert won't rah need guild to activate rather than the vac/boost signal?

I run a supercharger and I don't care the TB is on the wrong side.
VEMS + 12 PSI + Liquid Intercooler = Small Bore FUN!


stevieturbo

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Northern Ireland

13th Jun, 2014 at 05:20:31pm

There are no PWM or switched outputs you can use on the ecu ?

You could buy a cheap "progressive" controller that most WI kits use.

Maybe not cheap cheap...but it will give some degree of control over waterflow relative to boost.

http://www.aquamist-direct.com/806-560-rep...-v3-controller/

http://www.methanol-injection.co.uk/produc...products_id=120

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will


wil_h

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Betwix Harrogate and York

13th Jun, 2014 at 05:47:41pm

I had a look and there was no output that could be configured to switch on a boost level other than the PWM for the boost control.

I reckon that you could fudge the PWM output to work at 5psi. I think setting it to a really high switching frequency or zero will work. But I'm only guessing.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph



On 2nd Jan, 2013 fastcarl said:
the design shows a distinct lack of imagination,
talk about starting off with a clean sheet of paper, then not bothering to fucking draw on it,lol

On 20th Apr, 2012 Paul S said:
I'm mainly concerned about swirl in the runners caused by the tangential entry.


robert

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uranus

13th Jun, 2014 at 05:53:28pm




On 13th Jun, 2014 gr4h4m said:


On 13th Jun, 2014 robert said:
oil pressure switch ?


Robert won't rah need guild to activate rather than the vac/boost signal?



um ,come again *wink*

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

Paul S

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Podland

13th Jun, 2014 at 05:57:46pm

I'm currently planning Water/Meth injection.

What gubbins are you using? Just pump and nozzle or something else?

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

robert

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uranus

13th Jun, 2014 at 06:03:00pm

paul ,

on the tvr I just used a windscreen washer pump , a boost switch ,a valve in the line to regulate flow ,and a rheostat to regulate pump speed .

the nozzle was a piece of brake pipe flattened out and 3 0.5mm holes drilled in it.

it was mounted before the 2nd st turbo (the small one) and worked very well , I could run 20 psi on a 9.25:1 cr on 95 octane .

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

Sprocket

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Preston On The Brook

13th Jun, 2014 at 06:29:42pm

Sounds a bit shit if there is no single universal switched output.

As for the boost control output, you might be able to set it up such that it is only ever 0 or 100% duty at the points you need, effectively off or on. As for how to configure it....................

On 26th Oct, 2004 TurboDave16v said:
 Is it A-Series only? I think it should be...
So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'...


On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........

gr4h4m

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Chester

13th Jun, 2014 at 06:39:37pm

sorry Robert ive been drinking all day with customers

I run a supercharger and I don't care the TB is on the wrong side.
VEMS + 12 PSI + Liquid Intercooler = Small Bore FUN!


gr4h4m

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Chester

13th Jun, 2014 at 06:43:39pm

m just using a headlight washer pump, tank and a .70 nozzle boom home brew wi

I was using megajolt to switch the pump via a relay at 5psi but the sc ecu doesn't have that option...

colin if I did it again I would use a different ecu probable dta, but is was cheap and plug and play

I think I might invest is a proper pump and controller with the tank in the boot

I run a supercharger and I don't care the TB is on the wrong side.
VEMS + 12 PSI + Liquid Intercooler = Small Bore FUN!


Paul S

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Podland

13th Jun, 2014 at 06:55:31pm

Innovation at its best:

On 13th Jun, 2014 robert said:
paul ,

on the tvr I just used a windscreen washer pump , a boost switch ,a valve in the line to regulate flow ,and a rheostat to regulate pump speed .

the nozzle was a piece of brake pipe flattened out and 3 0.5mm holes drilled in it.

it was mounted before the 2nd st turbo (the small one) and worked very well , I could run 20 psi on a 9.25:1 cr on 95 octane .


Very different to what I had in mind, but significantly cheaper.

My ECU will run the pump at a certain boost or rpm or tps or mat, control a fast acting valve against a 3D table of duty cycle and (I think) stop the system when the tank runs dry. So no control issues.

Do you get adequate atomisation from the washer pump? Aquamist use 160 psi.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

tadge44

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Buckinghamshire

13th Jun, 2014 at 07:13:41pm

And I was just going to have a micro switch on the throttle to start the w/washer pump on full throttle !

robert

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uranus

13th Jun, 2014 at 07:19:43pm


On 13th Jun, 2014 Paul S said:
Innovation at its best:

On 13th Jun, 2014 robert said:
paul ,

on the tvr I just used a windscreen washer pump , a boost switch ,a valve in the line to regulate flow ,and a rheostat to regulate pump speed .

the nozzle was a piece of brake pipe flattened out and 3 0.5mm holes drilled in it.

it was mounted before the 2nd st turbo (the small one) and worked very well , I could run 20 psi on a 9.25:1 cr on 95 octane .


Very different to what I had in mind, but significantly cheaper.

My ECU will run the pump at a certain boost or rpm or tps or mat, control a fast acting valve against a 3D table of duty cycle and (I think) stop the system when the tank runs dry. So no control issues.

Do you get adequate atomisation from the washer pump? Aquamist use 160 psi.



I would say that compared to the modern setups the atomisation was non existant ! but it worked .

running it through the impeller would have minced it up pretty well.

the rheostat was great ,you could set it at full flow ,drive it at full throttle then turn down the flow and get a big increase in acceleration then turn it up again if you went to far and it rattled .

I had a light that came on on the dash when the water triggered at 7 psi , after lending the car to a friend he told me that was actually the wheelspin light lol.

bear in mind this was in 1990. *smiley* car ran best possible of 12.59 1/4 mile on treads and 12 psi.

Edited by robert on 13th Jun, 2014.

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

gr4h4m

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Chester

13th Jun, 2014 at 07:20:44pm

I just run a float in the tank so the system cant fire when its low.
apart from that its balls out at 5psi but then I only run a small amount of boost.

I had a vid somewhere testing the system in my kitchen, the mist was good, and without the nozzle I could hit the back fence from the kitchen window, that was a pass from me :o)

I run a supercharger and I don't care the TB is on the wrong side.
VEMS + 12 PSI + Liquid Intercooler = Small Bore FUN!


gr4h4m

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Chester

13th Jun, 2014 at 08:04:43pm

http://s132.photobucket.com/user/Mini_Addi...V00646.mp4.html

badly shot vid

I run a supercharger and I don't care the TB is on the wrong side.
VEMS + 12 PSI + Liquid Intercooler = Small Bore FUN!


apbellamy

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Rotherham, South Yorkshire

13th Jun, 2014 at 08:24:53pm

Nice tiles.

On 11th Feb, 2015 robert said:
i tried putting soap on it , and heating it to brown , then slathered my new lube on it

*hehe!*

gr4h4m

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Chester

13th Jun, 2014 at 09:48:20pm

Hahaha that was a few years ago before we ripped the kitchen out

I run a supercharger and I don't care the TB is on the wrong side.
VEMS + 12 PSI + Liquid Intercooler = Small Bore FUN!


stevieturbo

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Northern Ireland

13th Jun, 2014 at 09:55:32pm

Windscreen washer pumps are very poor, low pressure really

Headlamp washer pump is far better, as these work at much higher pressures.

If using a windscreen washer, it's handy to use a pressurised vessel and feed boost into it as well, that way you always have boost+pump pressure injecting water.

Have you actually asked SC if the ecu can do what you want ? It does seem odd there arent any flexible outputs you could use.

But one thing it is worth investing a few quid in at least, is the nozzle. Good nozzles are very cheap, although most do require decent pump pressure.

Although in the agri-world, there are atomising nozzles that work at very low pressures too. Would work fine for a pre-compressor injection system, with no pump, using boost as the supply for water delivery.

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will


gr4h4m

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Chester

13th Jun, 2014 at 10:19:29pm

Yep I have spoken to sc and they said they can't do it.

I use a headlight washer pump and it's worked very well the last few years.

I think I might invest in a proper WI system

I run a supercharger and I don't care the TB is on the wrong side.
VEMS + 12 PSI + Liquid Intercooler = Small Bore FUN!


gr4h4m

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Chester

14th Jun, 2014 at 02:25:42pm

Wil h is a genius... Now setup using the ecu boost control

I run a supercharger and I don't care the TB is on the wrong side.
VEMS + 12 PSI + Liquid Intercooler = Small Bore FUN!

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