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Default X98 vs 100% Meth WMI - 10-15-2017, 01:08 PM

So I have been reading that people are switching out 100% meth for X98 ethanol in the WMI tank. Anyone have any dyno comparison of the two? Or any other i information. Thanks!
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Default 10-15-2017, 03:52 PM

I can give you some scientific data.
Methanol takes way more energy to vaporize than ethanol
You can burn about twice as much meth for the same amount of air as ethanol so methanol makes more power.

Water takes way, way more energy to vaporize than methanol. So...


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Default 10-15-2017, 04:58 PM

I was was able to crank out a 11.44@118.84 with pure1 E18/100% meth vp m1 *dual cm7s* with major closures.
I have since added x98 to the meth tank and it pulls much better already with no closures at the exact same setting.
Hard to get 1/4 mile data on the street as it spins all 4 in first and halfway through second gears. Hoping to hit the track soon, will report back but the x98/meth mix works very well thus far.
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Default 10-15-2017, 05:15 PM

Quote:
Originally Posted by Roki187
I was was able to crank out a 11.44@118.84 with pure1 E18/100% meth vp m1 *dual cm7s* with major closures.
I have since added x98 to the meth tank and it pulls much better already with no closures at the exact same setting.
Hard to get 1/4 mile data on the street as it spins all 4 in first and halfway through second gears. Hoping to hit the track soon, will report back but the x98/meth mix works very well thus far.
Do you have 100% X98 in the meth tank?
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Default 10-15-2017, 05:50 PM

Quote:
Originally Posted by Wickedowesix
Do you have 100% X98 in the meth tank?
Just a mix of ~80/20 for now. I’m adding x98 as I go.
80-meth
20-x98
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Juan_BIGBOOST_TURBO Juan_BIGBOOST_TURBO is offline
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Default 10-15-2017, 05:58 PM

With our stage 3 turbo the car makes 20 more hp on x98 than full methanol with a much nicer torque and power curve. No throttle closures at all.


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Default 10-15-2017, 06:36 PM

At what point do you have to start considering adding foam to your tank?
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Default 10-15-2017, 07:06 PM

Quote:
Originally Posted by Juan_BIGBOOST_TURBO
With our stage 3 turbo the car makes 20 more hp on x98 than full methanol with a much nicer torque and power curve. No throttle closures at all.
Was everythung else equal? Boost, timing afr and trims
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Default 10-15-2017, 08:09 PM

Quote:
Originally Posted by Wickedowesix
Was everythung else equal? Boost, timing afr and trims
AfR was a little bit richer and trims were much lower. Same boost, same car, same day, same dyno. All settings were the same as well.


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Mrpink Mrpink is offline
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Default 10-16-2017, 02:45 AM

So are we saying we should be spraying ethanol rather than methanol?
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Default 10-16-2017, 04:05 AM

Quote:
Originally Posted by Juan_BIGBOOST_TURBO
AfR was a little bit richer and trims were much lower. Same boost, same car, same day, same dyno. All settings were the same as well.
What was the afr and trims reading before and after?
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Default 10-16-2017, 11:32 AM

Quote:
Originally Posted by Wickedowesix
What was the afr and trims reading before and after?
14.3 meth and 13.7 X98, trims: meth=maxed out, X98=36~32


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Default 10-16-2017, 04:36 PM

Agree with everyone on X98 my logs look way better. Much more consistent almost no throttle closures and timing looks better. I wouldn’t ever switch back, car feels much better
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Default 10-16-2017, 05:28 PM

What are peoples thoughts and experience with GEM fuels? the recipe is 37% Regular gas 21% Ethanol 42% Methanol.

https://gutts.nl/gem-fuel-best-practices/

http://www.azmeco.com/?mid=132
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Default 10-16-2017, 08:49 PM

I'm running 100% meth on e30 fuel without any throttle closures.
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Default 10-20-2017, 09:59 PM

Interesting I just tried 95% by vol rubbing alcohol form the pharmacy and the car is noticeably faster, but logs looks the same, if anything I am getting more throttle closure, then before but it is faster, so I do not think it is related to throttle, timing is similar as well, so something else is going on the engine just like it.

0-100km times dropped form 4.8-5.1 to 4.6-4.9, 3rd gear 40-120km pull dropped form about 6 seconds to about 5.6 seconds. Its like 10% more power with nothing visible in the logs weird.
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Default 10-21-2017, 07:27 AM

Quote:
Originally Posted by RMM
Interesting I just tried 95% by vol rubbing alcohol form the pharmacy and the car is noticeably faster, but logs looks the same, if anything I am getting more throttle closure, then before but it is faster, so I do not think it is related to throttle, timing is similar as well, so something else is going on the engine just like it.

0-100km times dropped form 4.8-5.1 to 4.6-4.9, 3rd gear 40-120km pull dropped form about 6 seconds to about 5.6 seconds. Its like 10% more power with nothing visible in the logs weird.
Relative DA will have a huge effect on a boosted car especially.
And it changes min to min
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Default 10-24-2017, 02:28 AM

Quote:
Originally Posted by I M inluv340
Agree with everyone on X98 my logs look way better. Much more consistent almost no throttle closures and timing looks better. I wouldn’t ever switch back, car feels much better
Can you post up a log, what % ethanol ?
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Default 12-06-2017, 10:50 PM

Does anyone know how to disable the target boost limit when using map 7?

In my car the TARGET is limited to DME_BT + 13.5 psi, which makes for unpredictable TARGET behavior, when using anything above a 40 adder as it is colder now my car can have a 5 PSI DME_BT, when this happens it results in a boost limit of only 18.5 PSI.

I really want to run 21-22 psi with consistent target setting, but cannot find any way to do it so far, especially as really need to be 1-2 psi below target to avoid throttle closures.

I know I can just run map 6 but I really like the protection in map 7 and I do not want to be limited to 18.5 psi on WMI.

Thanks,
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dRDiesel dRDiesel is offline
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Default 04-10-2018, 03:06 PM

I'm in the market for a 340i M sport. It's a pretty interesting platform and i do see a lot of people suffering with fueling issues and I'm hoping water-meth works better, but it also seems like people are trying out different jets to get it down properly? I'm coming from a 400whp 2016 Volkswagen GTI so i would need the 340i to be at least 450WHP. Don't you guys think dual CM7 is a little too much? I was running a single CM5 nozzle on the GTI and that was more then enough for a 450+ whp setup... not sure if these two platforms are comparable as far which jet to use.
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Default 04-10-2018, 03:55 PM

Quote:
Originally Posted by dRDiesel
I'm in the market for a 340i M sport. It's a pretty interesting platform and i do see a lot of people suffering with fueling issues and I'm hoping water-meth works better, but it also seems like people are trying out different jets to get it down properly? I'm coming from a 400whp 2016 Volkswagen GTI so i would need the 340i to be at least 450WHP. Don't you guys think dual CM7 is a little too much? I was running a single CM5 nozzle on the GTI and that was more then enough for a 450+ whp setup... not sure if these two platforms are comparable as far which jet to use.
Dual CM5's with E98 runs pretty well. Don't run any water on the B58, it doesn't like it. 100% meth works fine, too.

It's a little hard to dial in meth at tip in, as your AFR will be very rich for the first second or two. But hopefully things will improve with time (and hopefully flash tuning).


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Default 04-10-2018, 07:54 PM

Quote:
Originally Posted by Bullitt1841
Dual CM5's with E98 runs pretty well. Don't run any water on the B58, it doesn't like it. 100% meth works fine, too.

It's a little hard to dial in meth at tip in, as your AFR will be very rich for the first second or two. But hopefully things will improve with time (and hopefully flash tuning).
Wouldn’t it be more useful if we strapped the car on a dyno and fine tuned the meth on map 6 or 7 whatever the meth map is using AFR sensor on the tail pipe or secondary oxygen sensor location? I only have experience with a progressive controlled meth kit with a start/full spray option. Only reason I’m holding back on this platform is the choking, throttle closure, etc people have been experiencing and a piggy back never seems to fix any of those without proper flash tuning. I have a friend with a 340i and i personally experienced all these issues. On map 0 the car runs like a stock champ, on map 1 its quick and slightly has some hesitation and the choking is felt more on map 2 and others. We have even tried octane boosters and 100 octane blended fuel with 91.

edit: I wouldn't run straight water on the B58 as the air to water charge cooler seems to be work great, this platform is more sensitive octane wise so running 100% M1 would be a better option. I haven't read much on the X98, but has anyone tried a 60/40 type of mix or 50/50 so you get a little bit of octane boost + cooler intake temps for less knock and more timing?

Last edited by dRDiesel; 04-10-2018 at 08:16 PM..
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