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ktm733
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« on: October 12, 2015, 10:14:25 PM »
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Here comes the noob! So last night I dropped in a big turbo precision 5878 tubro with 550cc ev14 injectors and an a 4.2l s4 maf with maf housing 4in. Car starts then dies, so I unplugged maf and it runs. Well runs super rich .80 all day, and my fuel trims won't do any adapting as maf is unplugged? I thought I copied the s4 map correctly and I doubled checked? Can someone take a look, Also this file is not tuned!!! only thing done to it is mlfhn and krkte and tvub. I need to get fueling down before any tuning happens. Thanks for the help in advanced. I could tune injectors but I have not adaption happening so tuning would be done blindly.
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Lost
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« Reply #1 on: October 12, 2015, 11:03:21 PM »
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I did not look at the file, but did you just copy straight up Maf maps from 4.2??
Itc it is not done correctly. As you are not using 4.2 Maf housing. You need to copy Maf maps from 4.2 and also scale for larger housing.
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adam-
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« Reply #2 on: October 13, 2015, 12:30:55 AM »
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As above, running an S4 sensor and a different housing means that you don't just copy the S4 settings, you need to scale for the change in sensor size too.
The 550cc injectors should be pretty easy to scale - as their numbers are all over this site.
I guess you had a few beers last night judging by your post.. :p
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ktm733
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« Reply #3 on: October 13, 2015, 08:22:12 AM »
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I copied 4.2l maps, I have a s4 4.2l maf and sensor from a 4.2l
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SB_GLI
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« Reply #4 on: October 13, 2015, 08:49:17 AM »
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maybe your MAF is shit?
I'd run the stock sensor and housing with the MAF maps back to stock to verify.
You could then try the stock sensor in a larger housing and scale as a sanity check.
There's a program on here called MAFAdjust that will scale your MAF map based on old and new housing size. I use it all the time... works perfect.
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ktm733
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« Reply #5 on: October 13, 2015, 08:56:37 AM »
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One problem, my turbo inlet is 4 inches haha So I'm going to buy a new sensor today just to verify. Which there was a resistance test you could do to test sensor but I'm just dreaming. Will get back to you guys in a couple of hours. Do you guys want my xdf to verify?
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SB_GLI
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« Reply #6 on: October 13, 2015, 09:05:11 AM »
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nothing a little duct tape can't fix!
Edit: I just realized you're talking about a 4" MAF housing on a 1.8t. I've personally never ran that large of a MAF housing on a 1.8t or read anything about it, not that that says anything, but perhaps the 4" is just way too large for the velocity of air at idle on a 1.8t?
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« Last Edit: October 13, 2015, 09:10:46 AM by SB_GLI »
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ktm733
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« Reply #7 on: October 13, 2015, 09:17:24 AM »
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people are running with map and I don't get it as the injectors never adapt? is there a way to get lambda adaption without maf?
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adam-
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« Reply #8 on: October 13, 2015, 09:46:38 AM »
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Did not realise this was on a 1.8t. You'll never have enough low down air velocity to run a 4" MAF well. What is your target HP and why are you running a 4"?
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nyet
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« Reply #9 on: October 13, 2015, 09:49:29 AM »
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That is a ridiculous MAF to use on your project.
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ME7.1 tuning guideECUx PlotME7Sum checksumTrim heatmap toolPlease do not ask me for tunes. I'm here to help people make their own. Do not PM me technical questions! Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your ex
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SB_GLI
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« Reply #10 on: October 13, 2015, 10:14:23 AM »
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is that a hitachi or bosch maf?
MLOFS?
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ktm733
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« Reply #11 on: October 13, 2015, 11:24:14 AM »
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Well it was in the kit i bought. What maf should I be using? The inlet to my turbo is a 4in so what should I be running? I would be happy with 380-400hp. I don't want to run a huge maf I agree it was just in the kit so I'm trying to use it.
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ktm733
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« Reply #12 on: October 13, 2015, 11:24:52 AM »
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is that a hitachi or bosch maf?
MLOFS?
Bosch |
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ktm733
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« Reply #13 on: October 13, 2015, 11:47:53 AM »
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Alright to end this problem and to tune my daily properly I have bought a 3in to 4in rubber inlet hose that does a 90 degree turn so it will fit. I have purchased a vr6 3in maf housing and I'm buying a new s4 maf. I had chasing my tail so all brand new parts will be set for success.
I will then use the maf calculator which I need to search more on and then hopefully I can tune the car properly
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wannabee900
Jr. Member
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Posts: 42
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« Reply #14 on: October 13, 2015, 11:48:13 AM »
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Well it was in the kit i bought. What maf should I be using? The inlet to my turbo is a 4in so what should I be running? I would be happy with 380-400hp. I don't want to run a huge maf I agree it was just in the kit so I'm trying to use it.
Name of kit? Or perhaps a photo of it? |
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