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hiimkam Profile
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X-TRAIL FANATIC
 


Date Registered: 11-2008
Location: Perth
TOTAL POSTS: 414
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Intake butterflies opening when on boost/WOT?


Hey guys, stumbled on a pretty cool idea...

Im thinking about modifying the secondary intake butterflies (SIB) so they open when a certain boost pressure is reached.

at the moment, they operate under vacuum actuator and an electronic signal from the ecu.
what im thinking of doing, is disconnecting the electronic signal, and just using an internal wastegate actuator, so when a certain boost pressure is reached (say, 6psi) the SIBs open.

so youd get the sickest little power spike at 5000rpm and would only cost about 80 bucks

What do you guys rekon?



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GT2860rs, Ems stinger, tial external gate, 3" exhaust, 10psi and ~200kw @ all fours. Koya drifteks w/245/50 rubber, 70mm lowered springs, slotted rotors and painted calipers :)
14/Jul/2009, 4:31 pm Link to this post Send Email PM   Send Private Message MSN
 
Revhead Kev Profile
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X-TRAIL HOLIC
 


Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 5407
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Re: Intake butterflies opening when on boost/WOT?


I actually think that the butterflies (or VIAS) will be made unnecessary with your turbo installation Cam. You may actually be better disconnecting it altogether. What have the sentra guys done ?

I posted something about the way the VIAS works but cannot find it.
It you are interested in knowing more, let me know and I'll look into it again.

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Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
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16/Jul/2009, 2:39 pm Link to this post Send Email PM   Send Private Message Blog
 
hiimkam Profile
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Date Registered: 11-2008
Location: Perth
TOTAL POSTS: 414
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Re: Intake butterflies opening when on boost/WOT?


Thanks kev, i was thinking along the same sort of lines, because the air is under pressure, they wont make much difference at all...

Most of the sentra guys have taken the valves out completely, some left them in, and some have hooked them up to piggy-back engine computers to make them open at certain times.

but then again, the gains are minimal for the time and effort required.

as for me, i think ill take them out.

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GT2860rs, Ems stinger, tial external gate, 3" exhaust, 10psi and ~200kw @ all fours. Koya drifteks w/245/50 rubber, 70mm lowered springs, slotted rotors and painted calipers :)
16/Jul/2009, 3:05 pm Link to this post Send Email PM   Send Private Message MSN
 
Eggins Profile
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Date Registered: 08-2004
Location: Brisbane
TOTAL POSTS: 184
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Re: Intake butterflies opening when on boost/WOT?


I'd think taking them out, even with a turbo, will give you worse low down performance than leaving them in. I'd probably just disable them from opening.


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Shawn and Belinda Eggins
2003 STR, K&N, Strut brace, Ground wires, Dunlop LM702's, Tint, Mud flaps, Tow, Nudge, Spots, Mats, Rear scuff plate
http://eggins.synthasite.com/
17/Jul/2009, 6:30 am Link to this post Send Email PM   Send Private Message
 
Revhead Kev Profile
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Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 5407
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Re: Intake butterflies opening when on boost/WOT?


I'd agree with you Shawn.
The VIAS works by having different "tuned" lengths of intake runner for different airflows so that the pulses of air pressure created as each valve shuts helps this small air pressure pulse "force-feed" air into the next cylinder. A shorter length equates to shorter pulse intervals, typically at higher rpm's.

So if the butterflies are left open, then the length of the intake runners will be shorter which will be more tuned for higher rpm's and effect the low rpm performance when the turbo has not spooled up yet.

---
Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
My Blog
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17/Jul/2009, 12:10 pm Link to this post Send Email PM   Send Private Message Blog
 
hiimkam Profile
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Date Registered: 11-2008
Location: Perth
TOTAL POSTS: 414
Reply | QUOTE
Re: Intake butterflies opening when on boost/WOT?


Yeh true.

its be cool if we could spend a bit of coin for tuned length runners haha

but i think thats going a little over-the-top.

probably going on a diet for 3 weeks would result in more of a gain lol

---
GT2860rs, Ems stinger, tial external gate, 3" exhaust, 10psi and ~200kw @ all fours. Koya drifteks w/245/50 rubber, 70mm lowered springs, slotted rotors and painted calipers :)
17/Jul/2009, 9:43 pm Link to this post Send Email PM   Send Private Message MSN
 


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