Pages: [1]
Author Topic: Few questions about torque  (Read 6174 times)
masterj
Hero Member
*****

Karma: +62/-5
Offline Offline

Posts: 1049



WWW
« on: January 09, 2012, 07:41:59 AM »

So I have (again! Cheesy) few questions...

1. What would be the max safe KFMIRL value if I wanted to tune it for K03 with E85 fuel (this is for MAX part-throttle)? Right now I've set it to 239...

2. I understand that LDRXN limits KFMIRL/KFMIOP. Now how to convert target cylinder charge (KFMIRL value) to maximum load (LDRXN value)? This is to understand if my LDRXN limits my already set part throttle or not (please see image attached).

3. What would be the MAX SAFE boost you would recommend for K03 turbo with E85 fuel? I'm thinking about 1,1 bar, but not sure...

4. And sanity check: If I want to boost 1.1 bar max, should I set my LDRXN to 180? ((1000 atmosphere + 1100 boost) * 0.1 - 300)
Logged

sn00k
Sr. Member
****

Karma: +59/-2
Offline Offline

Posts: 277


« Reply #1 on: January 09, 2012, 10:15:46 AM »

which engine? what car? turbo? =)

on my audi a3 1.8tq -00 i see 1.1 bar boost at about 152 load.. as an example.. everything is stock.

i setup the kfmirl, the requested load("power") from the engine so i have it about 10-15% over max i figure that i need on 100% pedal.
then i scale it downwards from there, so say 70% of pedal gives about 70-75% of the max power..
this map defines how much power that is requested from the engine at a given pedal position..
and lower partial conditions dont really need to be changed unless you want to request full power from 30%..
but you can do this via the pedal maps too, and also smooth things out, i tune the pedal-map/s last to fine-tune the response of the throttle.

then i use the ldrxn to "limit" the maximum load, to form the "characteristics" of the engine during a WOT-run.. if i want to limit boost at 2500 to 70% to save the clutch.. ill lower it there..
ill perhaps increase it at 3500rpm to smooth out a powergap, that ive found after logging, so ill add some more there, thats why i allways set the kfmirl ~10-15% higher then needed, so ill have a margin to work with..

i dunno what engine your working with, but 239 would be VERY high and need a lower ldrxn to limit it.. keep it sane.. Wink

using normal fuel i boost 1.15bar on this stock engine, tapering off to 0.8 at revlimit.
using e85 and perhaps a good IC, you can step that up a notch or two.. so say 1.3-1.35 bar boost, and then taper it off to 0.9-1.0 at revlimit.. since way colder egt is to be expected, the turbine will accept this since the exhaust gasses will be lower in volume compared to using gasoline..

remember to add lots of fuel using e85.. 30% more is a rule of thumb.. but at full power ive sometimes used around 50-55% more, to keep the combustion colder and under control at high boost.. e85 has a pretty wide "powerband".. so as long as the ignition system is up for it, and the atomization is good enough, you can enrich the mixture to crazy levels without loosing power.. just dont forget to add timing when using this fuel.. it burns much smoother then gasoline, and is more stable in most cases, but.. keep it sane.. it wont really alert you with "pings" like gasoline does when its about to get unstable.. going "over the edge" with too much timing = boom.. Wink
just my 2c, good luck =)
Logged
masterj
Hero Member
*****

Karma: +62/-5
Offline Offline

Posts: 1049



WWW
« Reply #2 on: January 09, 2012, 10:36:50 AM »

which engine? what car? turbo? =)

on my audi a3 1.8tq -00 i see 1.1 bar boost at about 152 load.. as an example.. everything is stock.

i setup the kfmirl, the requested load("power") from the engine so i have it about 10-15% over max i figure that i need on 100% pedal.
then i scale it downwards from there, so say 70% of pedal gives about 70-75% of the max power..
this map defines how much power that is requested from the engine at a given pedal position..
and lower partial conditions dont really need to be changed unless you want to request full power from 30%..
but you can do this via the pedal maps too, and also smooth things out, i tune the pedal-map/s last to fine-tune the response of the throttle.

then i use the ldrxn to "limit" the maximum load, to form the "characteristics" of the engine during a WOT-run.. if i want to limit boost at 2500 to 70% to save the clutch.. ill lower it there..
ill perhaps increase it at 3500rpm to smooth out a powergap, that ive found after logging, so ill add some more there, thats why i allways set the kfmirl ~10-15% higher then needed, so ill have a margin to work with..

i dunno what engine your working with, but 239 would be VERY high and need a lower ldrxn to limit it.. keep it sane.. Wink

using normal fuel i boost 1.15bar on this stock engine, tapering off to 0.8 at revlimit.
using e85 and perhaps a good IC, you can step that up a notch or two.. so say 1.3-1.35 bar boost, and then taper it off to 0.9-1.0 at revlimit.. since way colder egt is to be expected, the turbine will accept this since the exhaust gasses will be lower in volume compared to using gasoline..

remember to add lots of fuel using e85.. 30% more is a rule of thumb.. but at full power ive sometimes used around 50-55% more, to keep the combustion colder and under control at high boost.. e85 has a pretty wide "powerband".. so as long as the ignition system is up for it, and the atomization is good enough, you can enrich the mixture to crazy levels without loosing power.. just dont forget to add timing when using this fuel.. it burns much smoother then gasoline, and is more stable in most cases, but.. keep it sane.. it wont really alert you with "pings" like gasoline does when its about to get unstable.. going "over the edge" with too much timing = boom.. Wink
just my 2c, good luck =)

Whoops, forgot to add that it is 1.8T engine on Passat 2001 Wink BTW: My stock KFMIRL goes as high as ~193! Smiley So I think I'll have to add more... Smiley
Logged

sn00k
Sr. Member
****

Karma: +59/-2
Offline Offline

Posts: 277


« Reply #3 on: January 09, 2012, 11:32:14 AM »

not really sure you need to go higher then that.. since the kfmiop limits it to 80-85%, and then ldrxn limits the max power.. try adjusting the ldrxn and im sure you will see atleast 1.2 bar boost att WOT.. then tune from there.. =)
Logged
masterj
Hero Member
*****

Karma: +62/-5
Offline Offline

Posts: 1049



WWW
« Reply #4 on: January 09, 2012, 11:40:52 AM »

not really sure you need to go higher then that.. since the kfmiop limits it to 80-85%, and then ldrxn limits the max power.. try adjusting the ldrxn and im sure you will see atleast 1.2 bar boost att WOT.. then tune from there.. =)

OK thanks Smiley Let's see what we can do with da LDRXN... Wink
Logged

createddeleted
Full Member
***

Karma: +7/-2
Offline Offline

Posts: 90


« Reply #5 on: January 09, 2012, 05:56:20 PM »

I just want to make sure my calc is correct.

My turbo - 5857 .82ar 4" inlet, ported S housing, billet wheel
My engine - 1.8t AWP

Large frame turbo @ 28psi = 1.93bar
1.93bar = 1930Mbar
1930Mbar - 300 = 1630 (specload*10)
1630/10 =163

So if the load we are asking for is limited say 20%

(163*100)/80 = 204

204 request = 10% fudge numbers (204*100)/90=227

So, my load request I should be asking for 227? (as per my theoretical calculations)
« Last Edit: January 09, 2012, 05:59:37 PM by createddeleted » Logged
Pages: [1]
  Print  
 
Jump to:  

Powered by SMF 1.1.21 | SMF © 2015, Simple Machines Page created in 0.017 seconds with 16 queries. (Pretty URLs adds 0.001s, 0q)