Advice please

BenTaylor · Post by **BenTaylor** » Wed Oct 04, 2006 12:21 pm

It will work, but it won't be perfect...

You can adjust the SAFC2 to work with the Z32 AFM, you just need to change the in/out settings (2in, 4out).

The problem is that having changed the injectors and the AFM you're going to have to do a hell of a lot of correction of the SAFC2. You'll be able to get the map safe at the top end, but it's not going to give optimal fueling throughout the map.

mutleysfriend · Post by **mutleysfriend** » Wed Oct 04, 2006 4:17 pm

BenTaylor wrote:It will work, but it won't be perfect...

You can adjust the SAFC2 to work with the Z32 AFM, you just need to change the in/out settings (2in, 4out).

The problem is that having changed the injectors and the AFM you're going to have to do a hell of a lot of correction of the SAFC2. You'll be able to get the map safe at the top end, but it's not going to give optimal fueling throughout the map.

Yep, I think this was exactly the concerns that Gary at APT had. Oh well I may have to stick with what I have got. Having nearing lost the back end on the A12 in the wet last night that is probably not a bad thing.

hybrid dreams · Post by **hybrid dreams** » Fri Oct 06, 2006 3:04 pm

keep the MAF sensor and run nitrous

...easy way to get to your power level. with more torque as well

damn why cant any of u drive mitus? I can answer technical questions about those....but I dont know sh#t about Nissians. but hey its all good.

skylines are respectable :P

welcome btw.

Post by **Ben** » Fri Oct 06, 2006 3:07 pm

Or spell nissan either ...

BenTaylor · Post by **BenTaylor** » Fri Oct 06, 2006 3:40 pm

Personally I think it should be possible to get the PowerFC working properly on an auto...

There are only about 5 inputs directly from the ECU to the TCM, just find out what they do and fudge them from somewhere else.

hybrid dreams · Post by **hybrid dreams** » Sat Oct 07, 2006 4:36 pm

murano3 wrote:Or spell nissan either ...

yup. Hell I know so little about nissans i cant even spell it right !! lol. :P

GTRJazz · Post by **GTRJazz** » Thu Oct 12, 2006 7:33 pm

You can run with the MAF past its limit you will just over fuel in the unmetered area, the injectors will be at the full duty cycle . The same cannot be said of fuel pump and injectors

sdminus · Post by **sdminus** » Thu Oct 12, 2006 8:46 pm

I would'nt run the MAF to its limit. just playing with fire really. You said you had an auto. I guess the powefc may not like the auto box like on the rx7. TBH you need the biger afm like the 300zx maf. vg30 ?

The injectors can not run at full duty cycle. Above 90 odd % the ecu will losse control of them and it will be un predicatble on an afr basis. Also you need to beaware of the ign timing up high. The afr's are just the tip of the ice berg as far as tuning it goes.

You could try and speak to Paul @ engine advantages becasue im sure this problem has come up before.

Scott

GTRJazz · Post by **GTRJazz** » Thu Oct 12, 2006 11:26 pm

sdminus wrote:
The injectors can not run at full duty cycle. Above 90 odd % the ecu will losse control of them

Scott

The ECU just sends a electrical pulse to the injector it cannot loose control of them. I would not run a set past 90% just to stop it running lean, but in this case it would be over fueling anyway. I know a R32 that ran 600 bhp on standard Mafs.

sdminus · Post by **sdminus** » Fri Oct 13, 2006 12:01 am

GTRJazz wrote:
sdminus wrote:
The injectors can not run at full duty cycle. Above 90 odd % the ecu will losse control of them

Scott
The ECU just sends a electrical pulse to the injector it cannot loose control of them. I would not run a set past 90% just to stop it running lean, but in this case it would be over fueling anyway. I know a R32 that ran 600 bhp on standard Mafs.

LOL...... At high duty the injector will not pulse i promise you this hense it WILL loose control of the injector pulse.

Did the 600hp car run the same injectors as you ?

Did it run the same fuel pressure ?

Did it run the same pump ?

Did it run an after market ecu such as the motec ?

Do you know who tuned the 600hp car ?

Scott