Nistune Forums

I was using "current" to make sure I was getting the most accurate data possible - and just disregareded the obvious dud measurements. Rather than have an average of good and bad values.

PL

I agree - past 3500 I'd be nervous about going leaner. Dunno what rpm you do at cruising speed (110kph here) but I'd be happy to run leaner than 14.5:1 up to about 100kph I reckon.

I reckon you'd wanna monitor EGT's to do it right.

PL

How did you get around the fact that you can't run negative figures in the fuel table unless O2 sensing is turned on? I guess you could just turn the Closed Loop flag off, leave it active in the fuel maps themselves, and then run negative values? Guess I've answered my own question there! I was thin...

Looks about right. Did you have any luck getting lean cruise?

Funny how the subject quickly changes from getting horsepower to getting fuel economy when fuel prices go up!

I also played with lowering figures for accelleration enrichment but found that I couldn't take a whole lot out.

PL

Hey Chris, An improved manifold shouldn't create a lean spot - if you're getting more airflow then the AFM will just measure it and more fuel will be added. That's the great thing about AFM based systems. So there's something else wrong there. How lean is it going? Grab us Wideband Input Trace from ...

Thanks guys. Drivers now updated:

http://www.plmsdevelopments.com/usb_drivers.htm

Regards
PL

I suspect he'll get the same power as all the other SR's we've done with that combo - around 210rwkw on 16psi. Good combo but even better with cams and more boost. I've actually done quite a bit of work on Graeme's other car. It uses Z32/550's/2871R but the 48 trim version. We were playing with it j...

Hey Chris,

You should be able to just tune it out in the fuel maps???

If you can take a log of a single run that goes through the spot and send it to me along with the maps then I'm happy to have a look and see if I can sort it for you.

pl@plmsdevelopments.com

Regards
Pete L

Hey guys, Matt may have mentioned this elsewhere but I thought I'd put a post up. I started a tuning guide ages ago but like so many things I've had trouble getting time to do any more to it. I've spent quite a bit of time on it over the last few days to make it something worth reading. Hopefully. I...

That was kinda gonna be my next thing to try. It just seemed weird that I couldn't even adjust boost around the standard boost level. I've gotta do some more work on that S15 soon (Z32/550's/2871R/FMIC and decent exhaust) so I'll play with the factory boost control system some more then. I'll natura...

Sounds very encouraging. I'd be happy if I could just map boost across RPM. Just stuff like being able to remove boost spikes and being able to run more boost at high RPM than in the midrange would be great.

Can't wait to get into it. Still don't know why that S15 didn't respond...

PL

Hey guys, I've played around a bit with the boost control maps on S14/S15. I did some experimenting on the bench and the boost control solenoid was certainly being affected when the high/low boost duty maps were adjusted. I monitored the PWM signal using a CRO and I could see the signal changing. So...

You don't need the boost sensor input or WG solenoid. It should run fine without them.

PL

Hey Nick,

I posted your CA/SR ECU's back today.

Did you get my email to dynowog@xtcaust.com ?

PL

Hey Guys, I've actually bench tested Z32 AFM's and they're quite happy to give more than 5V output. I got nearly 8V out of one. So the limiting must be done in the ECU. Which means that if you're running one on your 500hp+ RB30 without the Op-amp circuit then it'd pay to fit a 5V Zener. 10c well spe...