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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Gettin meth installed soon...



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      06-10-2012, 11:24 AM   #23
woptang22
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Thank you for the input. From the talks Ive had with the shop it seemed as if they were only going to use one nozzle. Is that a bad idea or do 2 just work better? Ill have to pass the info on to the shop.
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Originally Posted by cstavaru View Post
If you are using 50/50 you have to inject a lot (I am using 1200cc/min), but it works well. I now use 60/40 and it works even better (same power, but less mixture injected).

I would advise you to stick with 50/50 for the beginning. But make sure you install a meth elbow or charge pipe with 2 bungs and 2 nozzles, in order to have room for high mixture flow. I found myself many times with too small nozzles for the 50/50 mixture, and I had to change. I am now using 2x1.2mm nozzles and it works well.
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      06-10-2012, 01:40 PM   #24
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Hey man how are you doing? So you use 75/25, how is your power with that? Have you had it dynoed? I cant wait to get the meth installed and the pro tune done. Just a bit nervous because the shop recommended a BOV which is paid for and now Im reading its not good to have a BOV with meth because the BOV could spray it in the engine bay. But Ive also talked to numerous people that said it should be fine and many people have a BOV with meth. But I think they want to use more then a 50/50 mix which would make it more flamable. But Im just trying to take the shops word for it that everything will be fine.
haha, im doing pretty good, thank you. My power is good with 75/25, absolutely. Running the meth map is much more powerful than, running without it for sure. Ive even ran as high as around 90/10. I also wouldnt worry about the BOV.
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      06-10-2012, 03:49 PM   #25
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When are you getting the pro tune? Be sure to post dynos!
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      06-10-2012, 04:05 PM   #26
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Originally Posted by Ilma View Post
That's interesting........

I just bought two 1.2mm jets as well and asked Jeff Howerton about stepping up from the dual 1.0's.

Here is what he said: "2 x 1.0mm jets should work fine for 50/50 or 100%. I wouldn't use the 1.2mm for 50/50 In the end, it all depends on the tuning."


So what improved for you?

I think the concern with flowing too much water with a 50/50 mix would be quenching the engine
The improvement when flowing more mixture (2x1.2mm flow aprox. 50% more than 2x1mm) was that it eliminated some timing pulls that appeared in 4th gear at like 6200RPM.

I have no problem whatsoever with quenching, and I sometimes have the HFS-4 set to inject maximum flow at quite light engine loads.

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Thank you for the input. From the talks Ive had with the shop it seemed as if they were only going to use one nozzle. Is that a bad idea or do 2 just work better? Ill have to pass the info on to the shop.
I would say use 2 nozzles. 2 small nozzles are better than one large nozzle anyway (better atomization) so in any case I would use two of them. And you will also be able to easily up the flow in the future (and you will need it )

BUT: One key difference is that my tune (GIAC Stage 2 Race) uses higher timing advance and lower boost at higher RPMs compared to let's say JB4 or Procede (on the other hand, it uses lower timing and higher boost at lower RPMs). Also, GIAC stated that they used a 50/50 meth/water mixture in their testing (I kind of doubt this however).

Keep in mind that the Aquamist pump is an 160psi pump, while some Cooling Mist pumps commonly used with JB4 meth kits use a 200psi pump (adjustable to 250psi). Together with a CM10, it flows like 800cc/min. and there are many people using 2 meth nozzles (Big Tom uses CM10 + CM7, for example, and also 80/20 alcohol/water - so that's a lot of alcohol injected).

Last edited by cstavaru; 06-10-2012 at 04:12 PM.
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      06-10-2012, 04:58 PM   #27
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Quote:
Originally Posted by cstavaru View Post
The improvement when flowing more mixture (2x1.2mm flow aprox. 50% more than 2x1mm) was that it eliminated some timing pulls that appeared in 4th gear at like 6200RPM.

I have no problem whatsoever with quenching, and I sometimes have the HFS-4 set to inject maximum flow at quite light engine loads.
Good to hear you are not bogging down or getting misfires with that much flow!

I will definitely give the 1.2's a try and see what happens.

Makes some sense what you are saying in terms of more combustion chamber cooling with more water hitting the cylinder.

This is on a 60/40 mix right?
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      06-10-2012, 05:50 PM   #28
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Is Cobb ever coming out with a map for meth?
How much is the pro- tune once you have the ap?
I have never considered using meth because I went the Cobb ap route
And I dont track nor race my car, but it would be nice to know that I could upgrade to a meth system with maybe some RB turbos
One day
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      06-11-2012, 05:20 AM   #29
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It seems as if most pro tunes are around $500. And as far as a meth map it seems as if cobb will work with you on a beta meth map if you ask. It sounds like everything should work out fine if getting a pro tune though.

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Is Cobb ever coming out with a map for meth?
How much is the pro- tune once you have the ap?
I have never considered using meth because I went the Cobb ap route
And I dont track nor race my car, but it would be nice to know that I could upgrade to a meth system with maybe some RB turbos
One day
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      06-11-2012, 05:21 AM   #30
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Im supposed to get it all done on june 16th. So Im pretty excited about it all. Cant wait to get it done. When all is said and done Ill keep you informed on the dyno results.

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When are you getting the pro tune? Be sure to post dynos!
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      06-11-2012, 09:30 AM   #31
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Im supposed to get it all done on june 16th. So Im pretty excited about it all. Cant wait to get it done. When all is said and done Ill keep you informed on the dyno results.
Woptang, if you don't mind I'd like to come down to Akuma & see how the ATP tuning goes. If it's okay w/ you, just let me know what time & I'll try to make it there.
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      06-11-2012, 09:36 AM   #32
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No problem man. My appointment is for june 16th, which is this upcoming saturday. I have to be there by around 9 am or 9:30am. But the meth is going to get installed first then the dyno tune. Do you want to PM me your cell # and Ill call you before they get ready to do the tune?

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Woptang, if you don't mind I'd like to come down to Akuma & see how the ATP tuning goes. If it's okay w/ you, just let me know what time & I'll try to make it there.
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      06-11-2012, 09:42 AM   #33
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No problem man. My appointment is for june 16th, which is this upcoming saturday. I have to be there by around 9 am or 9:30am. But the meth is going to get installed first then the dyno tune. Do you want to PM me your cell # and Ill call you before they get ready to do the tune?
PM sent
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      06-12-2012, 05:03 AM   #34
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So in the end, I dont know much about the sizes of nozzles and benefits of using more then less nozzles. But Im guessing the most important thing is the pro tune being tuned to how many nozzles I have and how much flow comes from the nozzle/nozzles? That will then optimize the performance correct?
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