stalling
Turbo Mini Forums

I have been fighting an issue with the car for a while now. when taking it for a run and blasting along then coming to a stop like lights etc the car will stall, it will re-start straight away.

The car was on a dizzy with points with massively retarded ignition to stop the det. So I put it down to this. I have upgraded to Mj4 but I still cant get rid of the problem.

So I did some more searching and rebuilt the carb. all new seals, throttle ans choke, new jet, needle valve, bi-metallic strip, new jet seat, needle seat, new old stock dash pot, piston and damper.

/still the same.

I changed the off boost map to increase the advance at 800 rpm to try and catch it as it dips.. things are better, sometimes it drops and catches before stalling sometimes it wont but I cant stop it.

I read about the piston catching. So I have put the old dash pot and piston with a yellow spring, as I can get the car to rev nicely in the garage and always drop to 1100 but on the road the idle drops.

So I rasied it back to 1100 I was thinking maybe the dashpot was getting cold and the piston sticking so the stronger slightly looser dashpot and piston would force it back down. I have just taken it out on a run and recorded via the data logger, I can get it to drop to 1050-1100 but on returning to the garage and idling it creeps up to 1300-1400.....I presume that turning it up when running then frees up back at the garage.

can anyone help. would posting the data log help?

Edited by gr4h4m on 19th Feb, 2009.

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

I thought this was about a Russian leader for 1920s to 1950 ish,lol

WWW.FORCE-RACING.CO.UK PLEASE CLICK HERE

do you think a communist leader would help?

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

hi gr4h4m, im having similar problems with my clubby (1275 non turbo) i found mine to be the breather, or rather the fact its still fed into the carb and the engine is getting tired with quite alot of breathing going off its upsetting the idle really bad,

EDIT, lol just thought you might not have the breather plumbed in to your carb if its supercharged:$

Edited by Brett on 20th Feb, 2009.

Yes i moved to the darkside

Instagram @jdm_brett

Do you have a vacuum servo?? if so I would look at that, when you "come to a stop" you probably have your foot on the brake and if the servo is leaking it will drop your idle speed.


terry

website:- http://www.terryhunt.co.uk

I dont run a servo. or breathers back to the carb. I do have the SC breathers plumbed into the VAC advance but this is how everyone using this kit has them connected.

It must be a heat thing as you cant get it running spot on in the garage just idling but when you take it out on the road the idle drops??? I might look at rigging something up with the heater hose with a take off and wrap some microbore around the carbs dash pot in case its frosting.. got to be worht a shot..

I will have another look at the data from the megajolt log to see if there is any showing any different on the load from when its idling ok against when its stalling

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

not sure if this is telling me anything????

http://www.theiansons.co.uk/mini/testlog190209.csv

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

what sort of load figures should I see when coming off the throttle and the car stopping to idle?

just trying to see what it should be against the figures I have in the log when its stalling.

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

SC breathers into the vac advance?? whats that? does it have a one way valve because there is no vacuum when the boost comes on...

The load/advance looks strange to me.. can you post your map?? maybe it will make more sense.

terry

website:- http://www.terryhunt.co.uk

the vac advance is to equalize the pressure from each side of the supercharger housing.
I think its a carb thing... I think I'm nearly there...

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

Hi,
Post up your map around idle, see if there's anything that can be done.
Is there no idle strategy on these ECUs?
By that I mean you program in your desired idle, adv and ret figures and the ECU does the job for you...
Cheers,
Gavin :)

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My Mini build diary

well I did think it was an SU thing so I swapped to a Bike carb and it still stalls after giving it some beans and coming to a stop. I was hoping that the internal plastic piston and the fact the carb uses jets for idle and 1/4 throttle.

Maybe the SC is pulling more fuel when its slowing down and its getting too rich and stalling.
Heres my map.


Anyone else got any idea's?

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

A quick question I have put a wanted for the old poppet valve found in the hif's as I think the car is getting too rich when slowing down and causing it to stall, thinking that the popper valve might help.

I don't know anything about dump valves but could I use one on my inlet after the carb on my suck through setup to let some more air in when I let my foot off and slow down? If I cant get the poppet valve to work?

Just an idea.

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