HOW TO: A'PEXi SAFC II, X-Trail QR25DE - Page 2

Terranismo · Feb 21st, 2006, 03:07 PM

Marc, I just ordered my AFC today, and hope to have it in a week. I'm still awaiting shipment of other things (pulley, spacers, cams), so I'll have it dyno tuned in March. If anyone wants I can also post up a video once I get it done.

jwlsin · Feb 22nd, 2006, 02:07 AM

thanks valbo. iwill do that.

**ValBoo** · Feb 22nd, 2006, 06:05 AM

Quote:

Originally Posted by Terranismo

Marc, I just ordered my AFC today,....

Good stuff! (mind you I thought you had looked into SAFC before...)

To tell you the truth it is kind of intimidating once you get the covers off the ECU connectors... at least it was for me. Take your time, don't "snip" the wrong wire, he he he

Did you have en evaluation of your air fuel ratio as it is now?
at least that would give you an idea how much the SAFC could improve things for you (unless you are getting the SAFC for future boost upgrades

)

Do post your Vids when available ... its always nice to see other X-trails.

Terranismo · Feb 22nd, 2006, 08:28 AM

I don't know the ratio right now, but I can tell you that it is running gasoline stinking rich. I'm having it installed since I'll be putting it very, very away from the ECU connector. I'll surprise you once I get it installed and post some pics.

BTW No boost for now, only nitrous

aussietrail · Mar 27th, 2006, 04:48 PM

Hi Marc,

Now I got this mod drilled in my head, I want to find-out more information about it if I may

I can get this unit here in Australia and I can have it installed, dyno-tuned and all that (the fitting and dyno tuning is gonna cost me double the price of the actual apex'i

)

I need to know what was your fuel consumption like before this mod and after? since you've been running with it for quite a while.

What I'm trying to establish, is the benefits to fuel consumption should I go down this path which will in turn help me recover some of the money am gonna spend on this mod (which looks like over $1000AUS!!!)

Power and performance increase are secondary targets for me doing this mod. My exy is running rich 11:1 at the moment and I want/need to fix this problem and if this is gonna give me more power, then that'll be a bonus

Look forward to your reply.

Terranismo · Mar 27th, 2006, 05:11 PM

Jalal, I'm not Marc but I've been running my AFC II for two weeks now. I noticed a drop in gas consumption and also a reduction in unburnt gas fumes from the exhaust. My exhaust also does not burble or backfires like before. The increase in power (when tuned), can be really felt, and the added guages help also to monitor engine statistics.

Tomorrow I'm having my truck dyno tuned so I hope I can post some pics and vids.

BTW where are the rest of the X-Trail people? This forum seems dead lately.

aussietrail · Mar 27th, 2006, 05:17 PM

Thanks Terranismo,

How much of a drop in fuel consumption are we talking about here?

What is the fuel:air ratio setting you have set the apex'i to?

Nah, this forum is going OK, spring is just starting there, so they must be all out swapping winter tyres to summer ones LOL

Terranismo · Mar 27th, 2006, 06:13 PM

I set it to the same high throttle and rpms setup Marc posted. I haven't been able to measure the consumption rate on a full tank yet.

**ValBoo** · Mar 28th, 2006, 06:32 AM

Quote:

Originally Posted by aussietrail

Hi Marc,

..................

I need to know what was your fuel consumption like before this mod and after? since you've been running with it for quite a while.

What I'm trying to establish, is the benefits to fuel consumption should I go down this path which will in turn help me recover some of the money am gonna spend on this mod (which looks like over $1000AUS!!!)

Power and performance increase are secondary targets for me doing this mod. My exy is running rich 11:1 at the moment and I want/need to fix this problem and if this is gonna give me more power, then that'll be a bonus

Look forward to your reply.

Hi Jalal,

Sorry for the late response, I wanted to reply but Terranismo kept "cutting me off" ... ha ha ha

Don't do it for the fuel saving, you may not see that much of a difference.
Just as mine, your stock exy is running rich, but that is not necessarily "a problem"...

The way mine is set up, the corrected fuel map only takes effect in high throttle position; ie when throttle is open more than 50%; ie when you need the extra power. (If you really notice when you daily drive, your throttle is rarely open more than 50% unless you are taking off from a light or when needing to overtake on the highway)

aussietrail · Mar 28th, 2006, 01:04 PM

Thanks for the advice Marc.

So, you're saying that the fuel saving is not that significant to justify spending that sort of money of this mod?

I know that Nissan has set the stock exy to run rich to minimize the chances of warranty claims, but what are the risks of running lean?

Since the extractors and exhaust system upgrade I stay more often on higher revs

That is at the lights and on the highway, but majority of my driving is between 2,500-3,500RPM

The above price I quoted includes a dyno tune, has yours been dynoed at all? If yes, what was the confirmed power gain?

Terranismo · Mar 28th, 2006, 09:29 PM

The risk of running too lean is detonation. The ideal air/fuel ratio on our engines should be in the 13.5 range. I just came back from having my truck dyno tuned (172whp and 169lbs-ft of torque), and have my settings if anyone is interested.

aussietrail · Mar 29th, 2006, 01:14 AM

Wow Terranimso, that is really impressive!!

Is that at the wheels reading after the nitro experiment?

Do you have the dyno charts for us to look at?

Excellent stuff!

**ValBoo** · Mar 29th, 2006, 06:24 AM

Quote:

Originally Posted by Terranismo

The risk of running too lean is detonation. The ideal air/fuel ratio on our engines should be in the 13.5 range. I just came back from having my truck dyno tuned (172whp and 169lbs-ft of torque), and have my settings if anyone is interested.

But also ... the better tuned air/fuel (ie close to 13.0 - 13.5) will make for better burn and higher burn temperature which may affect the pre-cat and lead to the known problems with that.... At least for those who still have stock header.

-- Very good wheel numbers there

And yes, yes, yes please list your safc settings it will be nice to compare!

**ValBoo** · Mar 29th, 2006, 06:32 AM

Quote:

Originally Posted by aussietrail

Thanks for the advice Marc.

So, you're saying that the fuel saving is not that significant to justify spending that sort of money of this mod?

Correct, (at least that is my opinion)

Quote:

Originally Posted by aussietrail

Since the extractors and exhaust system upgrade I stay more often on higher revs

That is at the lights and on the highway, but majority of my driving is between 2,500-3,500RPM?

But, keep in mind that "Throttle Opening" and "Revs" are two different things and don't necessarily match each other (I'll let you think about that one for a whyle

)

Quote:

Originally Posted by aussietrail

The above price I quoted includes a dyno tune, has yours been dynoed at all? If yes, what was the confirmed power gain?

No, sorry, unfortunately no dyno was done on mine at all

Terranismo · Mar 29th, 2006, 07:40 AM

I was never able to reach a 13.0 a/f ratio. The X just kept on at a 12.0-12.4 range. The graphs were linear (made over 8 pulls) with a spike just when the rev limiter hits at 6400rpm. Marc, did you tune using the AFC pressure points?

Jalal, those numbers are fully N/A, the bottle is not yet connected. I'm planning on investigating a bit more about the AFC and going back to the dyno when the kit is in place. I know I can still pump out at least 8+whp from my current N/A setup.