lean cruise mod (have seen roberts)
Turbo Mini Forums

hi as as am going to riv run i fancy trying it to save me some cash any ideas on how easyly its done thanks charlie as its nearly a 700mile trip

Edited by charlieb150 on 22nd Apr, 2013.

bleed valve between the inlet manifold and the float bowl

my first test was a bit of crushed brake pipe inside a short length of silicone tube
my second was literally a bleed valve see pic
my current settup is a ball valve fitted under my wiper/lights stalk for quick adjustment the rest is ecu controlled similar to an idle valve

my current settup can also 'add' fuel

EDIT: mine however is an N/A carb yours may be different see my next post

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Edited by Brett on 22nd Apr, 2013.

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if you want it switchable ( i think robert uses a solenoid) then this needs to be between the inlet manifold and the float bowl
and if you already have the lean off pipe 'nipple' on the top front of the carb thats already restricted and the bleed valve is not strictly needed

the solenoid would need to go in the normal lean off pipe

Yes i moved to the darkside

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Mine has a solenoid in the lean off pipe which stays open until the MJ switches it closed.

It works pretty well but I'd like it leaner. Needs more fiddling.

In the 13's at last!.. Just

Yes i moved to the darkside

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Ah. That's the trick. I'll try that when its next off. Cheers Brett

In the 13's at last!.. Just

brett i have the turbo hiff and 2 spare metro solenoids :) so in theory i put the solenoid inline and wire it to a toggle switch on the colum yeah ? thanks charlie

brett i have the turbo hiff and 2 spare metro solenoids :) so in theory i put the solenoid inline and wire it to a toggle switch on the colum yeah ? thanks charlie

thats the one, is it settup without the lean off pipe connected?

if it is currently blocked off just re plumb it with the valve settup how you suggested and watch the afrs dont go too lean

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nope so may need to have a play with the needle first

i finally sorted the lean out brett i ended up halfing the boost and now no lean out and no clutch slip - until i can afford a flywheel for the rts :)

Brett where does the blue pipe on the otherside of the bleed valve go ?

"So wat we gonna do tonight Brain?"
"Same thing we do evernight Pinky!"
"Try to take over the world!"

How does it add fuel brett?

If something is worth doing, it's worth doing half of.

Edited by Brett on 23rd Apr, 2013.

Yes i moved to the darkside

Instagram @jdm_brett

sounds like a little bit of hassle lol i going to have a play tonight and see what happens lol

If doing this you need something adjustable, my first attempt used a solenoid and switch, opening it made it run massivly lean off the gauge and it missfired and stuttered, then changed to a bleed valve which I could have half open and it was spot on.

Audi s4 b5 - 470bhp & 486ft lbs

On 30th Apr, 2012 Brett said:
yeah stick the bit in and give it a wobble

Half that maybe down to our needles though

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Cheers Brett. I tried something similar, but by t-ing into the signal line from my pitot tube. Couldnt seem to get enough vacuum at cruise to make a difference. By the way how much vac are you guys seeing at cruise ?

"So wat we gonna do tonight Brain?"
"Same thing we do evernight Pinky!"
"Try to take over the world!"

Edited by Brett on 24th Apr, 2013.

Yes i moved to the darkside

Instagram @jdm_brett

Cheers, If I remember correctly I have just about F-all vac at 4000 rpm, maybe its the small turbo(GT1549) starting to spool already ?

"So wat we gonna do tonight Brain?"
"Same thing we do evernight Pinky!"
"Try to take over the world!"

that sounds about right mine does the same but slightly higher up the revs
if i hold 20% throttle up to red line i get alot of boost by 4500rpm
its uncomfortable to maintain any higher road speed as you constantly have to back off and pull it out of boost

Yes i moved to the darkside

Instagram @jdm_brett

Damn, so this mod will probably not work then. Maybe I should have a go at filing a new needle for it, I have to check my graphs again as I seem to remember the first 5 stations being fairly untouched from standard.

"So wat we gonna do tonight Brain?"
"Same thing we do evernight Pinky!"
"Try to take over the world!"

lol

I had something like this on the VNT wih a bleed valve, coast along at about 50-60 off boost.... come to a hill and the extra load on the engine pulls it onto boost... straight round to 15psi and the car takes off!