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N/A tuning 20V, VVIS, something diffirent.

How to go faster, stop quicker, and turn harder. Chips, exhaust, larger turbos, bigger/slotted/drilled rotors, high performance brake pads, manual boost controllers, performance shocks/struts/springs, airbox mods and more! Also discussion on HID and Xenon lights, aftermarket foglights and other exterior lighting.
tjts1
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Re: N/A tuning 20V, VVIS, something diffirent.

Post by tjts1 » Sun Nov 29, 2009 7:27 pm

Does the car you did the modification to happen to have a trip computer to give you real time fuel economy? I would be curious if its move efficient with just the long or both long/short intake turned on. I could see having VVIS setup with a switch in the dash. Both runners open for FE, and just the long runner open for power at low RPM.
Ambitious but rubbish

razorx
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Re: N/A tuning 20V, VVIS, something diffirent.

Post by razorx » Mon Nov 30, 2009 11:44 am

renns wrote: Very nice work! I wonder why Volvo chose to configure the system in the way they did?
I am still wondering.
renns wrote: What is the normal state of the VVIS valve? If it's normally in the closed position, I suppose one could test the low-speed improvement by simply unplugging the actuator?
The best description is the official Volvo one, in my first post.
Very short description:
Always both channels open, except when below 4100rpm AND more than 80% throttle opening.
When you accelerate the original system will only give you wat you need with more than 80% throttle, and to late.
renns wrote: Did you happen to log air-fuel ratio for the runs you posted earlier? Does the stock ecu correct automatically for changes in the changes in volumetric efficiency?
In some earlier tests we logged the AFR. It is still round the 14,7.
The stock ecu ccan handle this. A very important question b.t.w..

I believe I tested my idea by unplugging the connector.
Not 100% sure.

razorx
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Re: N/A tuning 20V, VVIS, something diffirent.

Post by razorx » Mon Nov 30, 2009 11:48 am

tjts1 wrote:Does the car you did the modification to happen to have a trip computer to give you real time fuel economy? I would be curious if its move efficient with just the long or both long/short intake turned on. I could see having VVIS setup with a switch in the dash. Both runners open for FE, and just the long runner open for power at low RPM.
The modified car has a trip computer.
With quiet driving the economy improves a little bit.

If you enjoy the system, the economy worsenes.
The switch I only used for testing purposes.
0 means Volvo system
1 means my system, which opens de schort duct automatically above 4100rpm.

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RobTheModd
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Re: N/A tuning 20V, VVIS, something diffirent.

Post by RobTheModd » Tue Dec 01, 2009 6:25 am

*cough cough* when can we get our hands on this.
as i have a 96 850 GLT id love to try it out. providing its not going to damage the car lol.
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Re: N/A tuning 20V, VVIS, something diffirent.

Post by matthew1 » Tue Dec 01, 2009 10:58 am

Razorx,

Please continue to use this website as your bullhorn regarding your research and product.

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I do not consider this advertising at all. On the contrary, this is super information for N/A owners.

Please continue to update us about your research, and your plans to make this a product.
Help keep MVS on the web -> click sponsors' links here on MVS when you buy from them.
Also -> Amazon link
. Click that when you go to buy something on Amazon and MVS gets a kickback.

1997 850 T5, MSD ignition coil, Hallman manual boost controller, injectors, R bumper, OMP strut brace [gone]
2004 V70 R [gone]

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tjts1
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Re: N/A tuning 20V, VVIS, something diffirent.

Post by tjts1 » Tue Dec 01, 2009 11:41 am

+1
I really enjoyed reading about your project and learned a lot.
Ambitious but rubbish

razorx
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Re: N/A tuning 20V, VVIS, something diffirent.

Post by razorx » Mon Dec 07, 2009 4:37 pm

Sorry for the delay, yust soldering some circuit boards. ;)

@Matthew: Thank you, I yust sent you a PM to be sure.

Well, after a year of serious testing, with multipe engine versions. MT/AT LPG/Gasoline, AFR e.t.c. I can only say it is a ready and well tested product.

If somebody is interested, please feel free to send me a PM.

At the Dutch Volvo 850 forum, http://www.volvo850forum.nl another person has started a very interesting topic about low budged tuning.

This is not as easy as my mod and involves some craftsmanship.
(Manifold matching). Lot of work b.t.w., but interesting.
I will inform you when there are the first results.

Kind regards,
Y.

razorx
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Re: N/A tuning 20V, VVIS, something diffirent.

Post by razorx » Sat Jan 02, 2010 7:26 pm

Good morning,

mck1 has helped me a lot working on the manual. I dared to change a few things.

Please read it well, my native language is not English:
http://www.paerl.it/volvo/vvis%20manual%20eng.pdf

Is this clear enough?
Kind regards,
Yits.

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Re: N/A tuning 20V, VVIS, something diffirent.

Post by beewerks » Sat Jan 02, 2010 9:32 pm

A very good writeup! The grammer could be tweaked a bit, but it can still be understood. So how long till we can get our paws on one of these babies!? :mrgreen:
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razorx
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Re: N/A tuning 20V, VVIS, something diffirent.

Post by razorx » Sun Jan 03, 2010 3:08 pm

They are available.
So anyone interested, please pm for more information.
Kind regards, Yits.

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