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Feel

Veedubya 'velle
Jun 12, 2003
4,918
2
Midlands
as in spooling earlier/quicker?

No, as in you can increase the advance of when the spark fires (the timing) so that the fuel burns for longer, and you get more power from each "bang".

There are three apparent benefits - cooler intake charge, reduced EGT and ability to increase timing. But the best gains come from the increased timing one;

1. The intake charge reduction is not massive (i.e. if you have a bad intercooler, WMI isn't going to fix it, if you have a good intercooler, it's not going to make a massive difference)

2. The reduction in EGT is useful, but you can't rely on having a full bottle on a road car, and so you can't map for higher EGTs. Forget to top up the tank and it would all go wrong very quickly.

If you tried to increase the timing without WMI, you would get knock/detonation, which is the fuel igniting before it should do.

The key fact to take away is that WMI can significantly increases the octane rating (which is a fuel's detonation rating) of the intake charge, on a properly setup system.

It's like running on race fuel, but with 95 in the tank.
 

jonjay

50 Years of 911
Jun 27, 2005
5,843
1
Essex
No, as in you can increase the advance of when the spark fires (the timing) so that the fuel burns for longer, and you get more power from each "bang".

There are three apparent benefits - cooler intake charge, reduced EGT and ability to increase timing. But the best gains come from the increased timing one;

1. The intake charge reduction is not massive (i.e. if you have a bad intercooler, WMI isn't going to fix it, if you have a good intercooler, it's not going to make a massive difference)

2. The reduction in EGT is useful, but you can't rely on having a full bottle on a road car, and so you can't map for higher EGTs. Forget to top up the tank and it would all go wrong very quickly.

If you tried to increase the timing without WMI, you would get knock/detonation, which is the fuel igniting before it should do.

The key fact to take away is that WMI can significantly increases the octane rating (which is a fuel's detonation rating) of the intake charge, on a properly setup system.

It's like running on race fuel, but with 95 in the tank.
Forgive my lack of knowledge/ignorance on this :)

I always thought that once the methonal ran out the car just reverts back to the way it was? I did notice DPJ got something to warn you, limit the damage caused if that happens?
 

DPJ

...........
Dec 13, 2004
7,996
2
NN Yorks / Salento
www.seatcupra.net
I reckon the charge cooling is that good, you could run a lightly mapped car without an intercooler instead. Expensive, pointless, but probably true. :D

If the wmi failed suddenly under load with a lot of added timing, you could get excessive knock and detonation, resulting in expensive extensive damage to pistons valves cylinders.
 

jamiebennett81

Guest
No, as in you can increase the advance of when the spark fires (the timing) so that the fuel burns for longer, and you get more power from each "bang".

There are three apparent benefits - cooler intake charge, reduced EGT and ability to increase timing. But the best gains come from the increased timing one;

1. The intake charge reduction is not massive (i.e. if you have a bad intercooler, WMI isn't going to fix it, if you have a good intercooler, it's not going to make a massive difference)

2. The reduction in EGT is useful, but you can't rely on having a full bottle on a road car, and so you can't map for higher EGTs. Forget to top up the tank and it would all go wrong very quickly.

If you tried to increase the timing without WMI, you would get knock/detonation, which is the fuel igniting before it should do.

The key fact to take away is that WMI can significantly increases the octane rating (which is a fuel's detonation rating) of the intake charge, on a properly setup system.

It's like running on race fuel, but with 95 in the tank.

thanks Feel, I think for me that is one of the best explanations for a specific product on this forum to date which is easy to understand

however I am confused though

on point one you mention if you have a bad intercooler, it's not going to fix it, but if you have a good intercooler, it does not make much difference (therefore as I have a decent intercooler, then do I need it?):blink:

so the real benefits are more applicable to point 2, but then you go to say you cant rely on a full bottle being topped up all the time and map to take this into account, in case it runs out and causes detonation, so again a too bigger risk on a road going car?:blink:

in affect it just increases the octane rating, but as I understand it, the higher the octane rating, the hotter temperatures it burns at is that correct? Would this cause more wear on internals of the engine if constantly using it?
 

DPJ

...........
Dec 13, 2004
7,996
2
NN Yorks / Salento
www.seatcupra.net
Octane rating of a spark ignition engine fuel is the detonation resistance (anti-knock rating)

Octane rating does not relate to the energy content of the fuel. It is only a measure of the fuel's tendency to burn rather than explode. The higher the rating, the more detonation resistant the fuel is.

Methanol is 123 Ron.
 
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jamiebennett81

Guest
Octane rating of a spark ignition engine fuel is the detonation resistance (anti-knock rating)

Octane rating does not relate to the energy content of the fuel. It is only a measure of the fuel's tendency to burn rather than explode. The higher the rating, the more detonation resistant the fuel is.

Methanol is 123 Ron.

123, jesus!! no wonder your car is flying, as I have only tried the light version of methanol from Halfords (forget who make it, but its not Halfords!!) and that only takes it to around 105-110 at the most
 

RobDon

Pro Detailer
Might have to look into this further before spending ££££ on a bigger turbo kit.

Good news on the SEM manifold, the new 70mm throttle body and adapter works a treat, no issues at all and performs great, so the SEM is on to stay. The car is pretty much 99.99% finished now, so I'll be putting money away towards a power upgrade at some point this year.
 

ibizacupra

Jack-RIP my little Friend
Jul 25, 2001
31,333
19
glos.uk
as an example even badgerwagen on me7 ecu when I ran it support 12 degrees more timing advance over its non 50/50 water meth, whilst running lower egt's and remaining more consistent.
2.2bar boosted FP Red giving it large, race, return to pits with physically cold to touch inlet mani... thats just its cooling abilities, spark advance from the meth was power gains (never dyno'd tho)
 

DPJ

...........
Dec 13, 2004
7,996
2
NN Yorks / Salento
www.seatcupra.net
How long does a tankful of mix last?

Indeed how long does it last? Furthermore how would the timings work on a deisel? Would you need different software etc...

Suppose I should go away and research :)

I use my washer bottle (which I hardly use on the screen) at 3 litres. That lasts me about 250 miles at average use. Much less if heavy sustained use.

The diesel kits are different but I understand there are huge benefits. Have a look at the Snow Performance website. :)
 

jonjay

50 Years of 911
Jun 27, 2005
5,843
1
Essex
I use my washer bottle (which I hardly use on the screen) at 3 litres. That lasts me about 250 miles at average use. Much less if heavy sustained use.

The diesel kits are different but I understand there are huge benefits. Have a look at the Snow Performance website. :)
Yea will do cheers D.

Shame our washer bottles arnt as big as the Ibiza Cupra's 6Ltrs!
 

Feel

Veedubya 'velle
Jun 12, 2003
4,918
2
Midlands
I've just realised this is Robbie's thread - sorry Rob.

'course, I'm forgetting you're keggy handed :D
 
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