Author Topic: Mapping - Who\'s tried it themselves?  (Read 15897 times)

Offline ianelvar

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Mapping - Who\'s tried it themselves?
« Reply #60 on: September 23, 2010, 09:08:41 PM »
http://www.rx7club.com/showthread.php?t=809261

I don\'t think this is the thread, but I remember now that BDC is the guy to look for posts from. He really knows his stuff. Again, good luck dude

Offline Prof

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Mapping - Who\'s tried it themselves?
« Reply #61 on: September 23, 2010, 09:50:03 PM »
This is what I know from tuning with the emanage and looking at other peoples data (try teamfc3s for some good writeups on timing and afr\'s - there\'s 2 threads in particular on there which are long runners and include input from people like BDC, Judge Ito, Dragon (Ross?) and others that explain the timing quite well).
 
Seems that you can have virtually no split in the vacuum part of the map, so before you see any boost, and then bring split to around 15 degrees as you start to see boost and towards your peak torque point, reducing the split again after the peak torque.
 
The engine will run fine on just the leading plugs, so provided the split isn\'t massive, you aren\'t likely to cause det by playing with the split much - provided leading timing is right.  I\'ve even seen on the chipped ecu\'s for the FC, and some of the maps for the RX8 tuned with emanage that they use negative split in the cruise/idle parts of the map - this is an area I really don\'t understand too well - and no one seems to want to let on why/how to use negative split.
"Plus this engine is probably one of the most volumetric engines going! It passes more air than a herd of cows eating vindaloo\'s" - courtesy of AtomicRex
 

Offline BlitzBoy

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Mapping - Who\'s tried it themselves?
« Reply #62 on: September 23, 2010, 10:13:40 PM »
I will keep it short and simple,
0 degrees split  on idle and light cruise
Then 10 degrees split on cruise and WOT
not much gains to be had with a figure less then this
"Piston Killa" 3rd Gen\'94 \'Oldone Racing Full Bridge Ported REW 13b engine with SCR seals\'. HKS T51 KAI turbo BBM mapped Motec ECU

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http://pistonkilla.blogspot.com/
old spec HB T51 470 @ wheels @ 1.2 BAR, 555 @ fly 10.46 @ 130 @ 1.25 Bar
new spec FB T51 482 @ wheels @ 1.15 BAR, 570 @ fly

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"el fénix" RX2 by Mark & Mark

Offline Steve-A

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Mapping - Who\'s tried it themselves?
« Reply #63 on: September 23, 2010, 10:43:01 PM »
Cheers guys. I\'ll have a play with the split on my way to work tomorrow. Will try various things and see how I get on :) I\'ll report back!
1984 Rx7: Gold. Edging towards roadworthyness!

Offline Steve-A

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Mapping - Who\'s tried it themselves?
« Reply #64 on: September 24, 2010, 10:18:13 AM »
Well I had a play on the way into work (50 miles or so).

The base MS map had 15 degrees at idle, dropping to 8 for cruise cells, and back to 12 for WOT and into boosted cells.

After reading what you guys had to say and on rx7forum etc, I\'ve made some fairly big changes.

I\'m running 0 degrees split for the majority of the map. After a bit of experimentation I\'ve gone for -3 degrees split in idle conditions. Seems to have given more a more stable idle than ever, though I did have to fiddle with my idle valve settings as it was idling high. Then for 90kpa I\'ve gone for 1 degree and 3 degrees at WOT. I\'ve made that 2 degrees and 4 for peak torque of 3kish and the gone for to 0 and 2 degrees above 6k.

Overall the engine seems a bit keener. Its running cleaner at light cruise and idle, especially where I\'m running it lean (16:1). I guess with 0 split it just means its got double the chance of igniting the mixture properly.

Next question then....

I\'m running premix, OMP is removed as I cant use 13b pump with 12a front cover. Because of this, in combination with my 2 stroke motorbike experience, I\'ve not activated the overrun fuel cut. I figured its not got for the seals to be spinning at high RPMs with no oiling. (The pops and bangs running a slightly lean mix on the overrun also sound awesome and make me feel like I\'m driving a race car :P)

On the downside to even get a 17:1 AFR on the overrun@ 3k rpm I\'m using 8% duty cycle or so on the primaries. 8-10% is about the same as I\'m using cruising at 30mph in 4th. Idle is using around 4%.

I\'m doing all I can to try to improve my fuel economy as this car is my daily. Any opinions of the safety/non safety of using the overrun fuel cut?

Or any other tips for fuel economy? As I said in the previous post I\'m cruising as lean as I dare and I\'m using as little cold enrichment as the engine seems happy with.
1984 Rx7: Gold. Edging towards roadworthyness!

Offline PGiljevic

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Mapping - Who\'s tried it themselves?
« Reply #65 on: October 11, 2010, 07:53:37 AM »
Quote from: ianelvar;717792
http://www.rx7club.com/showthread.php?t=809261

I don\'t think this is the thread, but I remember now that BDC is the guy to look for posts from. He really knows his stuff. Again, good luck dude

BDC is a full on c0ck wash! read here for graphic proof of that > http://www.rotarycarclub.com/rotary_forum/showthread.php?t=11528 (you need to sign up and post 20 times to have access but it\'s WORTH IT! JUST TO READ ABOUT THIS CERTIFIED IDIOT and AVOID HIM AT ALL COSTS!).

Take advice from him? sure if you want nobodies who have blown more motors that Paris Hilton has c0cks then go for it :mmmm
"Can\'t be defeated!, don\'t know the word!, shoulder to shoulder!, we\'ll fight the world!, we can\'t be beaten!!!"

Offline gav240z

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Mapping - Who\'s tried it themselves?
« Reply #66 on: November 15, 2012, 05:44:17 PM »
I recently read these resources and found them extremely helpful.

https://docs.google.com/file/d/0B_jE2-IDoVTfSGZhZEhsM0ZNRk0/edit?pli=1
http://www.wrex-racing.com/docs/fd/tuning/fd_tuning.doc

Not tried any of it yet, still reading to learn how it all works.

Offline KN_ELLIS

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Mapping - Who\'s tried it themselves?
« Reply #67 on: May 15, 2014, 12:10:22 PM »
Quote from: BlitzBoy;617202
Me and DaveHG do quite a bit of mapping using Datalogit on the Apexi PowerFC, there are a couple of others on here doing the same

Blitzboy do you still do mapping of FDs? If so how can I contact you?