99greenwagon

iTrader: (39)

hi,whats the situation regarding methanol mix at mot time?,does it affect the emissions test?,i have a h&s sports cat and is getting through the emissions test ok,but im considering running a 20% meth mix and was wondering if this will affect the test and then fail?

turboDean

iTrader: (4)

I think Methanol burns cleaner than petrol so would reduce emissions i would of thought...

mervil

iTrader: (5)

Would a decatted car running meth pass it? Especially if you got it got enough

chopperman

Meth is a clean fuel so should be better i would think.

99greenwagon

iTrader: (39)

hmmm,anyone on here running a meth mix during mot testing?

rob84

iTrader: (5)

woll tell you shortly mines due its mot soon, so will try it decatted at my friendly garage

Jolly Green Monster

iTrader: (4)

you will find that the theroy is that meth does burn cleaner, however meth burns leaner than petrol but your cars ecu will be running lambda for petrol on idle and fast idle during the test.. but lambda of petrol not meth, therefore it will be running rich, to the co and hc will probably fail... its even more complex as lambda is required for 20% meth and 80% petrol to therefore be correct.

that the theory, be interesting to see how it gets on.

Simon

99greenwagon

iTrader: (39)

yes,this is something im considering,but unless you purchase meth in 205ltrs which is one hefty mother,then it works out about the same price as v power with the added hassl etc,so probably wont go meth route,i want another 20bhp and 40lbft,without using meth!

Jolly Green Monster

iTrader: (4)

having run 10% and 20% and more everyday before the volume of fuel used is slightly greater so the saving wasnt present but fuel is costing more than it was a couple of years back when I last used it so much..

99greenwagon

iTrader: (39)

anyone else had experience with this?

Slugmeister

I run 10% methanol mix in standard 2.0 GX engine
Emissions for the test were: at 2500-3000 rpm
CO value 0.25% test max my value 0.00%
HC 200ppm test max my value 19ppm

Idle test at 450-1500 rpm

CO 0.30% test max my value 0.00%

I was impressed, despite all the negative stuff, the methanol gives a good ron increase and lower emissions. Also noticeable is a better pickup and ability to hold 5th gear at lower revs, suggesting a torque and power increase that is real.

scoobychris300

new mot laws now state cars that were fitted with a cat from new MUST have one to pass an mot now! regardless of if it passes emmisions test , so back to my friendly mot tester in july, lol
chris.

scooby800

iTrader: (1)

lol this is true now tho but mine has no cat and still passes the emissions

Hawkeye D

How is a meth mix used? Is it injected directly into the inlets?
Or is it added simply to the fuel tank?

205 litres?! That's the size of an oil drum isn't it?!

TonyBurns

iTrader: (3)

Its been law since 1992 but not many people took notice of it and it also covers cars fitted with cats after 1989 as standard, imports have a slight get out clause until euro 3 regsI think.

Tony

Slugmeister

I fill the tank within 5 litres of max then add the methanol at home by pouring it in! It is also a good idea to get a diagnostic unit to reset the engine management light that comes on if you add to much methanol. It leans out the mixture and the sensors complain to the powers that be, resulting in the red light coming on on the dashboard. You can ebay one of these units for 20 pounds. Acetone can also be used to improve the ron of the fuel. 125mls per tank gives a better burn and less omissions as well.
The methanol max for me is 15% as that is when the engine management light comes on! The emissions are reduced by both substances.
In reality both methanol and acetone are highly toxic and fume, so rubber gloves and store out the house!

toneh

iTrader: (1)

Good thread I was gonna ask the same question regarding meth mix come mot time ,
I'm completely catless and I reckon my chance of passing the emissions is slim
Like its been said in theory regardless of mix on idle the O2 is gonna be figuring out the mix and trying to target afrs so could make little difference

But I've had a thought , I've been toying with going full time open loop , what if I do and lean as far as I can just before my mot ,
Would this work ?
Btw I have a resonator box that looks cat like but isn't so upon visual inspection it might be enough to get through that bit

Slugmeister

You just have to watch out for where the engine management light comes on. It would be possible by adding acetone to increase the burn temperature and reduce the CO that way. My only experience is problems seen with the system seeing to lean a mixture when the methanol was 20%. The power increase was great, but I have new brakes and suspension!
Downside of acetone is obvious smell of pear drops!

MattyB1983

iTrader: (51)

How do you know its 5 litres from max ?

I run a 20% meth mix, I take 5 litres of meth to the petrol station in a can. Pour it in then add 20 litres of vpower on top.

jd5217

Am i reading this right, you are running up to 20% meth mix without a remap?

rob84

iTrader: (5)

I thought the very same thing. Meths needs the vehicle remapped. You'd be mental not too as all you are doing is running the risk of total meltdown. I run 16% meths and have never had a check light on.

jd5217

Same here, but mine has been mapped for 16% meth.

Infected by sti

iTrader: (6)

Matty I thought a 20% mix was 6ltrs of meth per 30ltrs of fuel or does it depend on what your initial in tank mix was when mapping?

Only ask as the way I was thinking was 60ltrs to a tank ( give or take a little ) so 20% of 60 Ltrs would be 12ltrs so below half a tank I was thinking it would be fine then to add 6 Ltrs to 24ltrs of fuel which would equal 30ltrs total?

So how does it work, is it 30ltrs PLUS 20% meth so 36ltrs total volume

Or

24 Ltrs of fuel with 6ltrs of meth which equates to 30ltrs total volume?

I'm just gearing up for this now, realistically I will probably be doing a 5ltr can like yourself to keep it easy at the pump and carry a 5ltr can in the boot incase I need to top up on a short run along with a normal 99ron map for longer journeys

eggy790

iTrader: (20)

its 20% of the total volume

so 20% meth 80% v power

as long as you make this constant whenever you put fuel in you'll be fine.

i usually stick either 5litres meth and 20litres v power = 25litres total

or 8litres meth and 32 litres v power for total of 40 litres.

its basically 4litres of v power to every 1 litre of meth.

im on a newage 60 litre tank, but wouldnt trust anything more than the 8/32 mix from petrol light it takes it right near max.. when in theory they should be 20l spare..10 maybe on petrol light and 10 god knows where, but its too close to max for me to try a larger mix.

MattyB1983

iTrader: (51)

As above, you want 20% of the total amount.
My tank is 50 lt so on mapping day I poured 10lt of meth in then brimmed the tank with vpower.

Also, runnung meth without it being mapped is shear madness. You will (if you havent already) cause serious damage. You shouldnt be getting any lights come up.

Infected by sti

iTrader: (6)

Cheers guys, I think ill drive up on mapping day and fuel up just outside and add the meth mix, ill run it down to the light and add 10 Ltrs of meth to 40ltrs of petrol, when the light comes on in mine it will take just over 50ltrs, I've tested it about 4/5 times now to make sure as I thought it was the total volume measurement and not on top of the fuel so to speak, so I should have enough room in my tank, so in theory then when ever I need to add fuel, if I get it down to around half a tank or under I can just add the 5ltr can and add 20 Ltrs of fuel and if I stick to that method I shouldn go wrong theoretically speaking

FroSt1

iTrader: (12)

When your light comes on there will be 10 litres in the tank.
Put in 12 litres Meth and fill to the brim, that will be 20% mix for you. Then keep adding fuel at 4 to 1 Meth keeping a 20% mix

MattyB1983

iTrader: (51)

Not always the case. Certain models have different sized tanks.

The Pink Ninja

iTrader: (23)

Like my 50L tank, I have roughly 8L left when the light comes on

MattyB1983

iTrader: (51)

And some early classics had 40lt tanks. My sti3 has a 50.