N54Tech.com - International Turbo Racing Discussion
(#26)
Old
kfardan's Avatar
kfardan kfardan is offline
Junior Member
 
Posts: 53
Join Date: Feb 2015
Car: 2014 BMW 335i Sport Line
Default 06-29-2020, 09:55 PM

My personal experience on the N55 engine is 100% Meth made more power than 100% E98.
The car did however feel just a little bit smoother with E98.
I tried even mixture of both maybe 70-60% Meth and the rest E98 .. made almost same power as 100% Meth.
So now I just stick with 100% Meth.

Might be different on B58 though, but give both a try and see which one works for you.


'14 F30 335i N55 EWG - Speedtech Stage 3 EFR 8374 - BM3 OTS Stage 2H 93 Flash - xHP Flash - JB4 - BMS Meth kit - Dorch Stage 2 HPFP - ER FMIC & CP
Reply With Quote
(#27)
Old
RMM RMM is offline
Junior Member
 
Posts: 109
Join Date: Apr 2017
Car: 120i
Default 06-30-2020, 07:59 PM

FYI I have BM3 with my own tune at about 25 psi, and e20 + 98, JB4 for meth, but no boost control, so I just run in map 0, with meth trigger set to 4.

Still running x98 on my car, I did try mixing in a bit more water again, like 25, 15, and it seems like at 25% I start to lose power, however the timing is perfect, so the water seems to be slowing the combustion down, or improving timing correction, but lose a little power.

I did increase the knock tables a little, and now have pretty consistent timing on both, however, there is a definite correlation to the % water, and timing corrections, so that would tell me that running more water is likely more safe for detonation.

One interesting comment, I have been adding more timing to my tune and , with more timing the power loss with added water is less noticeable. That supports my theory that the water is slowing the combustion and moving the MBT timing up. When I only had about 10-12 deg timing, adding 25% water was a noticeable and repeatable power loss like around 8%. However now with 14-16 deg timing, it is barley noticeable, or in the range of only 2-3%.

It may be that to get the benefit of the added water you need to add a few degrees of timing, but without a proper day of dyno testing I think that would be hard to know conclusively, as you would need to do many runs to compare different water % and different timing tables.
Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump




vBulletin Skin developed by: vBStyles.com
Copyright 2007 - 2020, N54tech.com