Can I use a VAFC to change CVTC?? - Page 2 - Nissan Forum
QR25 2.5L Engine Engine Discussion: 2002+ Sentra SE-R and SpecV

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post #16 of 41 Old Jan 1st, 2005, 10:12 AM
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With a hell of a tune, I could see that. A friend of mine took a STOCK D series honda (no intake, no hedder, no NOTHING, SOCH non v-tec) with a s-afc, and made 120 WHEEL HP, coming from <100whp

Tuning can do a lot more than most people will belive.

But that was over 6 hours of tuning.


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post #17 of 41 Old Jan 1st, 2005, 04:17 PM
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Quote:
Originally Posted by Marc Z31
With a hell of a tune, I could see that. A friend of mine took a STOCK D series honda (no intake, no hedder, no NOTHING, SOCH non v-tec) with a s-afc, and made 120 WHEEL HP, coming from <100whp

Tuning can do a lot more than most people will belive.

But that was over 6 hours of tuning.
a d16 honda isnt' a spec v or SER.

these obd II 32 bit ECUs maintain optimum a/f ratio at all times except WOT.......22whp is not possible on these cars unless he was using larger injectors than stock.




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post #18 of 41 Old Jan 10th, 2005, 02:33 PM
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The dude did say w/a few engine mods, so I'm assuming intake/headers/exhaust. Those mods w/ a SAFCII could easily put out 22hp, if not more, esp. if tuned by an exp. person.
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post #19 of 41 Old Jan 10th, 2005, 04:24 PM
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Quote:
Originally Posted by CLOVIS
The dude did say w/a few engine mods, so I'm assuming intake/headers/exhaust. Those mods w/ a SAFCII could easily put out 22hp, if not more, esp. if tuned by an exp. person.
SAFC2 gains alone, mind you this is on the 02-03, are very impressive. I have seen a dyno sheet of an 02 which with all conventional bolt ons did 169 WHP and 167 WTQ. After the SAFC2 and tuning it was 176 WHP and 173 WTQ respectively. This was on a dynojet. That's pretty nice power.

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post #20 of 41 Old Jan 10th, 2005, 06:06 PM
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ya, but that isn't any 22hp.




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post #21 of 41 Old Jan 10th, 2005, 11:18 PM
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Quote:
Originally Posted by chimmike
ya, but that isn't any 22hp.
Ide imagine they meant 22 WHP gain between I/H/E/SAFC2
22 from just an SAFC2 on the QR is a goofy claim.

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post #22 of 41 Old Mar 19th, 2005, 08:46 PM
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lol... you have no idea

Quote:
Originally Posted by chimmike
nobody has seen 22hp from an SAFC....and the butterfly valves have been proven to open up at 5400rpm.
No. Next time you drive your car, listen, and use your head. The secondary butterflies open at 5000 rpm. If yours don't, then maybe you have a problem, but mine have since I bought the damn thing. Try doing a little more work. and the 22 hp. thing, i didn't mean to make it sound like fact, it was something that i was told, and thought i would throw that tid bit out there. Personally, i don't believe it either, i can see about 8.
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post #23 of 41 Old Mar 19th, 2005, 10:03 PM
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IIRC the FSM does say 5000; although that doesnt necessarily mean that they do open up there.

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post #24 of 41 Old Sep 10th, 2005, 07:22 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.
What are you hearing open up when the tach hits 5k? Unless the tach is off as far as the speedo is on these cars. LOL. I have a CAI and when it gets alot louder, the tach reads 5 on the button. Is there something else making the noise? Not trying to question you, just trying to learn.
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post #25 of 41 Old Sep 10th, 2005, 08:30 PM
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Thats the sound of your secondary runenrs opening up. Sound bad ass huh . At like 5100 RPMS they open up to allow more air into your engine.
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post #26 of 41 Old Feb 18th, 2006, 08:34 AM
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VTEC operates on oil pressure. The computer tells a solenoid to open up and the oil pressure moves a pin into place activating extra rocker arms that contact the agressive cam lobes.

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post #27 of 41 Old Feb 20th, 2006, 02:33 AM
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Quote:
Originally Posted by B13Sentra2DR
VTEC operates on oil pressure. The computer tells a solenoid to open up and the oil pressure moves a pin into place activating extra rocker arms that contact the agressive cam lobes.
Yup, you got it right. All the BS about the cam profile changing is just that, BS. It would be imposible to change the profile of a solid state cam. Thus far motor technology dictates that you can only change the way an engine runs with a specific cam and internal setup not the other way around.

Oh, and I would have to agree that the second runners are not fully open until ~5100 RPM or so, they probably start to open at 5K. I have tried running my car to figure it out but it seems that the vavle is not letting the maximum amount of air in (and therefore is not fully open) until 5100 RPM.

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post #28 of 41 Old Apr 4th, 2006, 06:13 PM
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Exclamation

damn chimmike knows his stuff thats dope i wish i knew all of that , is there a way that the spec-v can be tune differently, u know how euro cars get chip and that makes a big big different cause my friend has a jetta and he did that and his car is really fast now , so is there a chip that can do that to our cars, if there is what is it? cause my friend had hear about putting a REVO chip but i dont know about that. thank
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post #29 of 41 Old Apr 4th, 2006, 10:35 PM
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I'd like to know more about his tuning theory. On a dead stock 06 spec, would it gain anything? Heck even if all it did was increast gas mileage (safely without risking engine harm mind you) it just may be worth it to such a thing?


For example, im not about to put money or time into any kind of bolt ons at this point, but a few tricks i've heard sound tempting to take a closer look into.

Namely a voltage controller and this advanced tuning stuff. I really know nothing about either, but if i can plug and play a little box that better controls the cars voltage and results in a side effect of better mileage and a tick more power, im all for it as it will save me money in the long run and make things a tad more fun.

And tuning? Im always hearing about these computer programmer tools for trucks and American automotives that will increase power and milage without changing anything on the car itself; just push the button the on controller as its plugged into the car. Y don't i ever hear about that on here? And do manufactures really deprogram the ecus to be that restrictive? I mean adding gas mileage and hp without having to bolt on a preformance exhaust seems like kind of a no brainer to me.

Or is this SAFC thing which i haven't a clue what your talking about, is that tool

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Last edited by ScarCrow28; Apr 4th, 2006 at 10:38 PM.
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post #30 of 41 Old Apr 13th, 2006, 04:21 PM
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Quote:
Originally Posted by tryptych
No. Next time you drive your car, listen, and use your head. The secondary butterflies open at 5000 rpm. If yours don't, then maybe you have a problem, but mine have since I bought the damn thing. Try doing a little more work. and the 22 hp. thing, i didn't mean to make it sound like fact, it was something that i was told, and thought i would throw that tid bit out there. Personally, i don't believe it either, i can see about 8.

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.
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