krazydbiker
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« Reply #315 on: October 17, 2013, 05:39:38 PM »
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the hiss? yeah :-P anyways, progress was good tonight, KRKTE verified and tested, 20% rich and 20% lean both showed perfectly in fuel trims also tested NOLRA, disabled adaptions perfectly, i cant wait for my 5th injector to come in, i received only 4 today  this will be great for a friends car also, he is limited by injector at the moment and i do not think any of the regular's tuners offer different injector calibrations. i will be posting progress soon, i know its nothing new for the audi/vw guys but volvos i do not see it often. |
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dream3R
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« Reply #316 on: October 18, 2013, 03:05:40 AM »
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the hiss? yeah :-P anyways, progress was good tonight, KRKTE verified and tested, 20% rich and 20% lean both showed perfectly in fuel trims also tested NOLRA, disabled adaptions perfectly, i cant wait for my 5th injector to come in, i received only 4 today this will be great for a friends car also, he is limited by injector at the moment and i do not think any of the regular's tuners offer different injector calibrations. i will be posting progress soon, i know its nothing new for the audi/vw guys but volvos i do not see it often. Looking forward to it! |
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dream3R
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« Reply #317 on: October 18, 2013, 03:10:56 AM »
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Sorry, you missed my point. I was under the impression that some guys had issues from a hardware point of view when reading this...
This implies that there might be hardware issues with the engine type (in general?) so that was what I was trying to understand as I've never seen any restrictions like this personally. No point in modifying the software if the hardware can't cope with it and if someone (not you in this case) basically says that "my turbo is crap, it won't hold boost properly..." then I couldn't give any hints on fixing that purely with software basically.
Sorry about the confusion.
Hi, Sorry for being abrupt, I thought you were taking the $$$  , hope there isn't any hard feelings. I think this is either an unknown ME7 thing, or the K24 turbo cannot hold 1.4 bar to the redline. I don't have any hardware issues and it is well looked after. I thought it may have been torque limiting issues but I raised that all last night as a test and confirmed via logging (it was requesting 61 in miopt_w) and it still tailed off. No idea if mine is cracked, but they all do so it probably is, it's only got 40k miles on it though. I've got a hybrid 20g sitting right here, waiting to go on |
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fredrik_a
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« Reply #318 on: October 18, 2013, 03:49:30 AM »
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...or the K24 turbo cannot hold 1.4 bar to the redline...
My experience say they can with no real issues. And of course... No hard feelings from my side.  |
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dream3R
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« Reply #319 on: October 18, 2013, 03:55:54 AM »
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OK, so hardware aside. Can you give me some clues which would stop it doing so if the issue was software? I don't want spoonfed, just some clues... |
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daniel2345
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« Reply #320 on: October 18, 2013, 04:52:29 AM »
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Measure the airmass. Then we will see if the turbo is out of spec.
Boost is irrelevant, airmass defines the right end of a compressor map.
And no, the K24 in the volvo can not hold 1,4bars until redline with only exhaust mods.
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dream3R
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« Reply #321 on: October 18, 2013, 04:54:11 AM »
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Good point!
I have that logged. I assume breathing mods?
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dream3R
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« Reply #322 on: October 18, 2013, 05:00:09 AM »
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I upped the boost quite a lot last night as a test, this is the log, it's kg/h BTW.  |
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daniel2345
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« Reply #323 on: October 18, 2013, 05:22:42 AM »
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You are already overboosting it...
More via mail when i have time.
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dream3R
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« Reply #324 on: October 18, 2013, 05:24:35 AM »
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No problem, yes it was just a test to see how it reacted.
I have flashed back to me tune of 1.25bar which works nice.
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rufusgti
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« Reply #325 on: October 18, 2013, 11:01:13 AM »
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Measure the airmass. Then we will see if the turbo is out of spec.
Boost is irrelevant, airmass defines the right end of a compressor map.
And no, the K24 in the volvo can not hold 1,4bars until redline with only exhaust mods.
;)Right! First we need to calculate the engine air flow rate (CFM). The formula for this is: CFM = (L x RPM x VE x Pr)/5660 Where L = engine capacity in liters RPM = engine speed VE = engine volumetric efficiency. From A. Graham Bell's book Forced Induction Performance Tuning some good values for VE are: Stock 2-valve = 85% Stock 4-valve = 90% Street modified = 93% Competition = 105% Pr = pressure ratio To calculate the pressure ratio you need to know what boost pressure you want to run and then plug that into the following formula: Pr = (14.7 + Boost)/14.7 At 1.4 bar and red line (~6500 RPM) S60 2.4T5 need (2.4 x 6500 x 90 x 2.4)/5660=595 CFM . Max K24 CFM is ~ 550. |
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dream3R
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« Reply #326 on: October 18, 2013, 11:22:42 AM »
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Just looked that book up, it's a collectors item!
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dream3R
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« Reply #327 on: October 18, 2013, 02:59:52 PM »
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If this graph is right, and also if I'm reading it right, I'm reaching the choke point of the turbo! 0.2 m3/s = 423.7764 CFM, can't be right surely.  |
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« Last Edit: October 18, 2013, 03:01:55 PM by dream3R »
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krazydbiker
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« Reply #328 on: October 18, 2013, 03:01:50 PM »
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a few others pointed this out to me a while back, and yes indeed we are at the choke.
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daniel2345
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« Reply #329 on: October 18, 2013, 03:06:34 PM »
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Not the right map.
Its the one from a 25 year old porsche 4cyl or audi rs2.
Different compressor design today, different numbers also.
Max airflow is a little higher.
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