jlm-so im assuming the tests were done with winterized gas as well in sub-freezing
temps? doesn't matter how great the o2 wideband turns out in 80F 60RH or
watever you tested. wat are the severe cold and dry conditions?

no, i was not here back a year ago. only bought the mcs a few months ago.
just asking some basic questions to see how you guys decided to go even
smaller than 15% pully without modifying the fuel or timing (or am i missing
something?)

stoich IS way too lean for wot. should be rich. how about part throttle?
any egt readings confirming all this?

Im just wondering. :smile:

_________________
03MCS IB/Blk: 123, Aerokit, R90, 16" TK5, 6CDMP3, and more.

 

no answers before someone detonates their motor? :???:

 

kenchan, in an earlier post you said you didn't want the MCS to run too lean. What A/F is too lean for a modded MCS?

 

dominic- actually, i don't know cause i haven't considered altering my
pully. i was hoping i could see some sort of analysis about this.

but how sure are you when increasing boost in cold weather
with winterized gas? im sitting here lowering psi for winter on my other
car while you guys talk about increasing psi (without altering the fuel and
timing) so was just wondering how that worked.




:smile:

_________________
03MCS IB/Blk: 123, Aerokit, R90, 16" TK5, 6CDMP3, and more.

 

I have heard concerns of waterpump cavitation at high rpms with the 19%.I just got the 15% myself.

 

This was probably the biggest concern early on, but recent postings on this site have stated that I think it only becomes an issue at greater than 19% and you would have to be racing where you ran your MINI exclusively at high RPMs for a longer period of time.

I'm ready to take the plunge and "upgrade". To 17z% or 19% I'm not sure yet. Anyone want to talk me out of it???

 

Do it. i will have Dyno numbers today from 17% pullied car. as well as Air fuel ratios on Oxygenated gas cause it is Winter here in the Northeast.

 

>>Do it. i will have Dyno numbers today from 17% pullied car. as well as Air fuel ratios on Oxygenated gas cause it is Winter here in the Northeast.

Doug,

Did I read that you have the pulley and a drop in filter only ? I just added the 15% pulley, have the stock filter and also live in the North E. I have been reassured by several knowledgeable people that this setup is ok. The maker of the shark, John Conforti ?? made comments that he felt that stock ecu with pulley = lean condition. This as everyone who met me at the Detroit pulley can attest causes me a little possibly unwaranted paranoia.

I await your results with much antisipation. I am alittle confused by oxengenated gas. If it says 94 octane, how is it different in the winter ? I don't need and wouldn't understand the chemical analysis, just trying to understand if it's octane rating and thus it's resistance to detonation is somehow altered ?
Thanks in advance.

 

>>Do it. i will have Dyno numbers today from 17% pullied car. as well as Air fuel ratios on Oxygenated gas cause it is Winter here in the Northeast.

Cool...post results as we are all eagerly awaiting!!!

 

Doug, I understand you didn't go there specifically for the 17% pulley. You got it when something wasn't ready. But now that you know that Helix is also carrying the 19%, what's your thoughts on this? I mean from a strictly performance perspective, if you like the difference a 17% makes over the 15%, the 19% could provide twice that. Possibly more if the increase in boost makes it run a tad leaner. Have you considered or do you think you may consider the 19% down the road? Or do you think the 17% is just about right. BTW, I'm going next Wednesday the 17th.

Thanks!

 

>>jlm-so im assuming the tests were done with winterized gas as well in sub-freezing
>>temps? doesn't matter how great the o2 wideband turns out in 80F 60RH or
>>watever you tested. wat are the severe cold and dry conditions?
>>
>>no, i was not here back a year ago. only bought the mcs a few months ago.
>>just asking some basic questions to see how you guys decided to go even
>>smaller than 15% pully without modifying the fuel or timing (or am i missing
>>something?)
>>
>>stoich IS way too lean for wot. should be rich. how about part throttle?
>>any egt readings confirming all this?
>>
>>Im just wondering. :smile:
>>

All this stuff has been tested and answered by several different companies. Give Helix or RDR a call. They've got the charts.
>>_________________
>>03MCS IB/Blk: 123, Aerokit, R90, 16" TK5, 6CDMP3, and more.
>>
>>

 

Well here it finally is.



Here are my Numbers:

Air Intake Temp: 81 degrees
Coolant temp: 181 degrees
Peak Air Intake Temp: 161.6 degrees
Air temp: 57 degrees
My mods: 17% helix pulley, JCW exhuast, K&N typhoon intake

Fuel /Air Ratio graph

Sorry I do not have a better picture

The purple line is my Air fuel ratio during the run. The flat Orange line is 11 to 1 AFR. You can see during the run that my AFR is at 11to1 and even dips below it. It curves upwards at the end when we let of the gas and put the car in neutral. The Wideband O2 sensor was placed at the tailpipe. It would read about .5 richer if it was placed before the catalytic converter.
Air Fuel Ratio: 11 parts Air to 1 part fuel CAN WE SAY RICH!!!!!!!!

Air temp: 57 degrees

 

Greatgro,
The day i went to get exhuast Eric and I had a misunderstanding about what exhuast I wanted. No biggy :smile: So I bugged him for a Pulley instead. I choose the 17% cuase that is what he had lying on his work cart. I fealt i would be a good candidate to test a smaller than 15% pulley since I do allot of miles with my car and I race (Drag/Autocross) as well. The 19% will make a little more power but After seeing todays run I am hapy with what I have and I think my main constriant is High end flow (Exhuast, Throttle body, etc...).

 

I know about your misunderstanding. I believe I happened to call Eric later that day to discuss pulleys. That's why I hinted of that in my post...
I think the right free flowing exhaust on a pullied car can make a big difference. I know you kept the stock exhaust for a long time. I did too. Didn't think it made much of a difference and it seemed too expensive to justify for the gains. But since I added the UUC, I can't believe the high end power this has. I think my MINI could handle more boost very efficiently due to the free flowing exhaust. Maybe I'm full of crapola, but I think the exhaust can really help make even more power with more boost. By more I mean more than you'd expect from the increase in pulley. I think they'd work synergistically.