Check it out [Archive] - SR20 Forum

: Check it out

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03-07-2009, 01:34 AM

Kudos to the first one to spot it. ;)

03-07-2009, 01:47 AM
oh sweet, time to upgrade the valve train!! same story for the b14??

03-07-2009, 01:53 AM
Yep. :)

pocket rocket
03-07-2009, 03:27 AM
im biting my nails patiently waiting...the agony!!!! lol

03-08-2009, 05:58 PM
ok, someone is going to ask, might as well be me. Is there even more rpm available maybe, or going to be? Sending you a email Calum. Loren

I just read Dave's post in a MS thread so some of this has already been answered.

03-08-2009, 06:14 PM
Oh sweet Jesus this is sick! Details please.


03-08-2009, 08:26 PM
Heard about this last night! NIIIICCCEEE!!!!

03-09-2009, 02:15 AM
can some one can explain clarify this

03-09-2009, 07:39 AM
can some one can explain clarify this

Tuning beyond 8000 RPM. Need any more clarification than that? :biggthump

03-09-2009, 10:06 AM
MMMMMM... I just touched myself and need a tissue...:eek2:.... You know you can throw in a copy of the firmware with the next shippment going my way...


03-09-2009, 10:35 AM

Can you add an extra line for the 9000rpm range? let's get a bin from him, some springs and let's have fun!!!

03-09-2009, 11:52 AM
55% duty cycle? Is that right on?

Tuning beyond 8000 RPM. Need any more clarification than that? :biggthump


03-13-2009, 12:55 AM
oh sweet, time to upgrade the valve train!! same story for the b14??

Looks like it took about 13 minutes to "spot it!" :biggthump to iczer200sx!

Bench test results are good so far. A couple of the benefits will be the ability to tune past 8000 rpm, and setting functional rev limits beyond 8000. Are there any more? hummm....

Stay "tuned" for more details!


07-07-2009, 10:31 PM
A little history:
Calum brought the issue of the 8012.5 RPM limit to my attention last year saying that if I could figure out how to fix it, a number of people in the community could benefit. Once resolved, we naturally started asking ourselves; Why would the Nissan engineers impose this RPM limit? After many hours (actually days) scouring the code for possible ramifications, and also running an ECU on the bench to very high RPM levels, no apparent problems were found. This does not mean that none exist! (See Caveats below)

What the mod does:
Basically it removes the 8012.5 RPM limit, such that the RPM value used to compare rev limits, perform fuel and timing map lookups, calculate TP, etc., is allowed to increase above 8012.5 RPM when the engine actually revs beyond that.

What the mod means:
The simplest and easiest to implement benefit of the mod is to be able to set rev limits above 8012.5 RPM that actually work. Another benefit is the ability to tune fuel and ignition maps above 8012.5 RPM. This a little more involved, in that it requires the user to 1) rescale the fuel and timing RPM scale tables to expand the RPM range and 2) to re-tune the fuel and ignition maps accordingly. If only the scales are expanded, the fuel and timing maps will be offset such that the map value at what was 8000 rpm is now reached at something less. It also obviously means that the RPM must reach the upper end of the rescaled values in order to use the map values in the far right column. Therefore, after rescaling the RPM scales, the values in the maps must be changed accordingly, or you will probably run lean and retarded throughout the RPM range.

Another aspect that may need to be considered is TP (theoretical pulse). Most of you already know that TP ~ K x Q/N where K is the injector K constant, Q is the air mass flow rate from the MAF VQ table, and N is RPM. Without the RPM mod, N stops at 8012.5, which means that TP continues to climb relatively more quickly as Q increases with RPM (if it actually does with your setup). This tends to automatically richen the AFR. With the RPM mod, N continues to climb with Q such that the TP calculation stays balanced, as long as the MAF sensor doesn't max out. What this means is that the TP scales for the fuel and timing maps, along with the TP Max table, may also need some adjustment.

A couple of obvious ones, that don't really have anything to do with this mod are 1) your MAF sensor does not peak below your desired max RPM, and 2) your injector duty cycle at the higher RPM stays within reason. Caveats that do pertain to this mod are potential, unforeseen issues which may arise at the higher RPM and TP values. There are many tables that are indexed by RPM and TP, and neither Calum or myself have the facilities to test every possible combination. The bottom line is that you and/or your favorite tuner will be responsible for utilizing this mod as you see fit.

All that being said, this is really exciting stuff, as Calum with the RTV2, and myself with TunerCode firmware bust some of the myths surrounding tuning with OEM Nissan ECUs. I can't wait to see how the Nissan wizards among you utilize the capabilities we're working on to your benefit. BTW, when you purchase a Calum RTV2, the TunerCode firmware (which includes this RPM mod, and much more) is included! Also, the TunerCode firmware is available separately and will work with any supported ECU (details soon), however you will need the RTV2 board to take advantage of the extra I/O capabilities it provides.


07-07-2009, 11:37 PM
Good stuff Dave/Calum!

Too bad my KA will not take advantage of the RPM mod anytime soon...

It probably was a good thing I sold my V1 RT ecu. Soon I'll be sending another ecu(Cali spec) for the V2 board :biggthump

07-08-2009, 12:13 AM
calum i sent pm. you seem to be hardly on the forum

10-18-2009, 08:27 PM
First release of TunerCode features listed at
(Ugly web site)

Screen Shot...


11-03-2009, 10:44 AM
Any chance of one day being able to switch from MAF to MAP?

11-03-2009, 11:15 AM
Any chance of one day being able to switch from MAF to MAP?

Yes, with the addition of an IAT (intake air temp) sensor, preferably inside the intake manifold.


11-04-2009, 04:09 PM
Yes, with the addition of an IAT (intake air temp) sensor, preferably inside the intake manifold.


Awesome! The Z32 maf looks dumb on my 4" intake tube! lol...

Also wondering if you're keeping the fuel/timing tables 16x16?

How about being able to switch from distributor to coil on plug setup? Or would swapping to a S13 SR20DET ecu be better?

I'm asking questions because I'm debating if I should stick with the RT ecu and/or upgrade to V2, or keep waiting for the MS PnP kit to become available and switch to that...

I'm currently running a RT V1 S13 KA ecu on my turbo setup.