NefMoto

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?

jep, simple as that

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!

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

No, you "should of" learned something about building motors and what imposes RPM limits.

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.

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

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.

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!

(http://i1035.photobucket.com/albums/a434/thegtiman/Garage%20Streamline%20test%20n%20Tune%200704/Typical_20vT_BAM_AUQ_AUM_pwr_tq_Comparison_210713_zpsbedb3bea.png)

^ Good illustration on that dyno plot. My butt dyno agrees. I never change NMAX with the K03s. Stock is plenty of revs.

Even K04s run out up top..

Have to be careful with that statement. The 1.8t has like 3000000000 K04 variants-lol.

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.