Dave87VRS
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« on: January 27, 2015, 10:14:50 AM »
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When increasing rpm limit via nmax is it just a simple case of increasing it?
Or do further addresses need to be changed? Since the stock map runs up to 6800 the ecu may need more data if that makes sense?
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« Reply #1 on: January 27, 2015, 10:21:42 AM »
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jep, simple as that
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Dave87VRS
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« Reply #2 on: January 27, 2015, 10:50:03 AM »
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Thanks mocke. My thinking was the ecu may not have fueling data after 6800rpm?
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ddillenger
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« Reply #3 on: January 27, 2015, 10:52:21 AM »
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Thanks mocke. My thinking was the ecu may not have fueling data after 6800rpm?
It will use the last value it does have data for for anything in excess. Also, if you go more than 3-400 over stock, You must also raise NMAXF or get a fault for WARRANTY VOID! |
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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 experience!
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Dave87VRS
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« Reply #4 on: January 27, 2015, 11:25:59 AM »
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Arr ok thank you. So 7095rpm should ok without raising nmaxf? Whats the max you can push a 1.8T to rpm wise? I know, i should of bought a vtec car
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nyet
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« Reply #5 on: January 27, 2015, 11:33:13 AM »
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Whats the max you can push a 1.8T to rpm wise? I know, i should of bought a vtec car
No, you "should of" learned something about building motors and what imposes RPM limits. |
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adam-
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« Reply #6 on: January 27, 2015, 11:34:55 AM »
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What turbo is on it, and what valve train?
If it's a K03(s), it's never gonna hold boost after 6k anyway, so it's pointless having an 8k limit.
I've got mine at 6.3, because I rarely cross that line, even though I've still got 20psi there.
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Dave87VRS
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« Reply #7 on: January 27, 2015, 12:32:46 PM »
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What turbo is on it, and what valve train?
If it's a K03(s), it's never gonna hold boost after 6k anyway, so it's pointless having an 8k limit.
I've got mine at 6.3, because I rarely cross that line, even though I've still got 20psi there.
Sorry yes its a ko3s turbo. Standard auq engine. I dont intend to set a limit at 8k just a little over 7k would do. |
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Dave87VRS
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« Reply #8 on: January 27, 2015, 12:35:31 PM »
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No, you "should of" learned something about building motors and what imposes RPM limits.
Thanks for your reply but my question was more of a curious question as to what people have had them going upto. No intentions of cranking it up to far |
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adam-
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« Reply #9 on: January 27, 2015, 02:31:00 PM »
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Yeah, the K03s is never gonna make boost (usable, I mean), much over 6/6.5k, so setting it to 7 isn't beneficial.
That said, 6.8 would be fine, 7 would be my limit, but I've got a degree of mechanical sympathy, I hate going much above it.
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cerips
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« Reply #10 on: January 27, 2015, 04:30:44 PM »
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As all the comments above why rev so high when it's not making the power there, change gear or change the gear ratios. As you can see from the picture below torque drops off really quickly above 6000 rpm!  |
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316LV
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« Reply #11 on: January 28, 2015, 06:50:28 PM »
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^ Good illustration on that dyno plot. My butt dyno agrees. I never change NMAX with the K03s. Stock is plenty of revs.
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Go ahead and give me negative karma... I don't care if you like what I post princess.
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nyet
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« Reply #12 on: January 28, 2015, 07:05:01 PM »
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Even K04s run out up top..
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ddillenger
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« Reply #13 on: January 28, 2015, 09:02:37 PM »
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Even K04s run out up top..
Have to be careful with that statement. The 1.8t has like 3000000000 K04 variants-lol. |
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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 experience!
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carsey
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« Reply #14 on: February 07, 2015, 06:45:06 AM »
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They all do it (k04's), They all have that little dip in graphs high up in the RPM point.
I wouldnt class that graph above of the differences as very good as it doesnt show a mapped engine. Can easily get a extra 100lb/ft torque on those plots which will alter the whole graph massively.
Nothing wrong with a higher RPM limit, just it can depend where your gear ratios are and where you will 'fall back' onto your power band when you change gear at certain rpm sites.
7250rpm is a common one for a mapped 20vt.
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