Can I use a VAFC to change CVTC?? - Page 3 - Nissan Forum
QR25 2.5L Engine Engine Discussion: 2002+ Sentra SE-R and SpecV

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post #31 of 41 Old Jul 26th, 2006, 01:43 PM
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Quote:
Originally Posted by chimmike
nobody has seen 22hp from an SAFC....and the butterfly valves have been proven to open up at 5400rpm.
You may see powergains if you are running a turbo system with an untuned safc, then after you tune the safc you may see power gains. On an NA car it doesnt do anything really. And yes butterfly valves do open around 5400-5500rpm ish

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post #32 of 41 Old Jul 26th, 2006, 04:59 PM
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you're insane if you run an SAFC untuned while boosting.




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post #33 of 41 Old Feb 10th, 2007, 01:36 PM
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Quote:
Originally Posted by 04SerSpecV
Hi all
My question is is there anyway to have that kick in before 5000rpm. Like does anyone make a controler for that ex: the A'PEXi V-TEC AFC II. If so please let me know also if not will there ever be one in the future?

Thanks
Preston
"Continuous Valve Timing Controller" Try the A'PEXi SAFC-II. Im petty sure that you cant change the RPM that CVTC "cracks" though.
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post #34 of 41 Old Feb 26th, 2007, 08:14 AM
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Ok, first I havent been here long and I can tell that chimmike knows his stuff. Nice schooling on the CVTC vs.- V-Tec. However I have to ask where you got that it opens up at 5400 RPM though. I have had my 04 since it came out of the show room, and it has always engaged the secondaries at 5,000 even with a 6250 RPM fuel/rev. cut.

FYI, I dont have a scanner so I cant prove it numbers wise, but I will post a link to a picture of my interior when I can. I had my Apexi' SAFCII tuned for max peak power while still maintaining a safe fuel ratio on the dyno, and all I saw was 8 hp. In order to see more of a power gain and really appriciate the SAFCII I had to replace a LOT of parts.
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post #35 of 41 Old Feb 26th, 2007, 08:24 AM
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Quote:
Originally Posted by modenaf1
Is there a way to see the runner control? In my '96 Taurus you can see the butterflies snap open at 3500RPM from under the hood. Just put it in neutral and yank the throttle cable until you see movement, if they work or not. That might be easier than trying to listen to it as you rev past 5K.
Just so you know, you can only hear the difference going down the road with a spec-v. Revving it at idle only makes it bark really loud. Also, you cant rev them from under the hood. There is no throttle cable, its all electronic controlled.
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post #36 of 41 Old Apr 7th, 2007, 02:19 PM
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I just bought the apexi s afc neo after i got a stage 2 port and polish and the nismo cams in my car, i also but a walbro 190 lph fuel pump as well. You can use it on the controllable valve timing but it is not worth the while. it is real hard to setup on our cars as well but when u figure it out it works great. you can control a bunch of stuff and it works even better when you put a turbo on your car
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post #37 of 41 Old Jun 26th, 2007, 08:21 PM
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A Tuner's Guide Inside the QR25DE - Tech - Sport Compact Car Magazine

Here's a little article that includes information from the engineer of the motor... Clearly says 5000 rpms
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post #38 of 41 Old Jun 29th, 2007, 03:32 PM
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Theres a way to wire the AFC neo and have the secondaries kick in at 4500 and stay open until the car comes back down to 4000. I googled "qr25de wiring harness for AFC NEO" and a forum came up on b15sentra.net of a kid that had the pin layouts for all year spec V's check that shit out...
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post #39 of 41 Old Dec 31st, 2009, 07:06 AM
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I don't know why you would want to change it, It's set to 5000rpm because it's doing a job. The QR25de in it's natural state loses major power at 5000rpm, and they put the system in to increase airflow and keep power somewhat consistent. If you want more time in CVTC, order the Jim Wolf Technology Balance Shaft Removal(BSR) and valves and valvesprings, this will increase the rev limit to 7200rpm.
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post #40 of 41 Old Jan 1st, 2010, 09:05 AM
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Quote:
Originally Posted by specvnasty View Post
I don't know why you would want to change it, It's set to 5000rpm because it's doing a job. The QR25de in it's natural state loses major power at 5000rpm, and they put the system in to increase airflow and keep power somewhat consistent. If you want more time in CVTC, order the Jim Wolf Technology Balance Shaft Removal(BSR) and valves and valvesprings, this will increase the rev limit to 7200rpm.
The BSR, aftermarket valves, and aftermarket valvesprings will NOT increase your rev limit. Your rev limit is set within your ECU. The three above mentioned things simply increase the safety of raising your rev limit.

So. . . Your face is dumb!
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post #41 of 41 Old Sep 2nd, 2010, 02:39 PM
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Heard that lowering the secondary opening point to 4700rpm would give a 3whp. It's dyno-proven look on B15U.com - Nissan Sentra Forum

I can also hear the secondary runners open at about 5100rpm stock. I'll try soon to lower it to 4700.
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