IPD sale XeMODeX - Experts in Volvo Electronics
Did you know? 🤔
Logged in users can get email notification of topic replies Log in or register (free).
Amazon Link Buy anything with this and it helps MVS!

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.
razorx
Posts: 31
Joined: Tue Nov 17, 2009 3:55 pm
Year and Model: 855 '96, 854 '93
Location: Amsterdam, Netherlands
Has thanked: 0
Been thanked: 0
razorx

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

Post by razorx » Thu Nov 19, 2009 11:52 am

tjts1 wrote:rozorx
Great write up. I have a quiestion. Were you able to retrofit the VVIS monifold on an engine that didn't have it before or did you simply over ride control on a car that already had it? In the US, Volvo put VVIS on 850s made in 93 and early 94. All cars that had 4 stud wheels. All 5 stud wheel cars don't have VVIS. I want to retrofit a VVIS manifold on my 96 850. Does it bolt up to the engine the same? Do you know if that is possible?
cheers
Justin
I built it on a late '93, so it had a VVIS inlet manifold.
I am not sure if the mountings are the same as for the newer manifolds without VVIS. If it fits, you will also need the solenoid. Check the vacuum diagrams. Exept vacuum hoses you will need a non return valve and a T coupling piece.

Regards,
Y.

polskamafia mjl
Posts: 2631
Joined: Wed Apr 01, 2009 1:10 am
Year and Model: 1995 Volvo 854 T-5R
Location: Hershey, PA
Has thanked: 10 times
Been thanked: 8 times
Poland
polskamafia mjl

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

Post by polskamafia mjl » Thu Nov 19, 2009 11:48 pm

So essentially this is will have no effect on my 96 GLT :-(
'All my money is gone and I have an old Volvo.' - Bamse's Turbo Underpants

Current: 1995 Volvo 850 T-5R Manual - Bringing it back from the brink of death
Previous: 1996 Volvo 850 GLT - Totaled

drsugg
Posts: 59
Joined: Sat May 03, 2008 8:29 pm
Year and Model: 97 850
Location: Eureka Ca.
Has thanked: 0
Been thanked: 0
drsugg

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

Post by drsugg » Fri Nov 20, 2009 7:50 am

Hello; First I must say,very interesting! I drive a 97 850 na 5 speed. I also happen to have a complete extra 850 motor with the VVIS manifold. I have been thinking of trying to install it on the 97, but knew it would need a stand alone controller. I know the VVIS can really affect engine performance from past and present applications of the concept. Let us know when we can procure one of your controllers.As far as it bolting on,they use the same manifold gasket and it looks to have all the usual attachments. The vacuum solenoid is also mounted on the manifold.

tjts1
Posts: 673
Joined: Tue Nov 13, 2007 12:31 am
Year and Model: 96 855 NA 5 speed
Location:
Has thanked: 0
Been thanked: 2 times
tjts1

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

Post by tjts1 » Fri Nov 20, 2009 9:14 am

drsugg wrote:As far as it bolting on,they use the same manifold gasket and it looks to have all the usual attachments. The vacuum solenoid is also mounted on the manifold.
Thats great! I'm going to pick up one of these next time I'm at the JY.
Ambitious but rubbish

razorx
Posts: 31
Joined: Tue Nov 17, 2009 3:55 pm
Year and Model: 855 '96, 854 '93
Location: Amsterdam, Netherlands
Has thanked: 0
Been thanked: 0
razorx

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

Post by razorx » Fri Nov 20, 2009 1:28 pm

Nice these enthousiast reactions.
Saterday 28th of this month I hope to have performance data on paper.
Done by a company which can do partial load tests.

All the CAD/CAM work for the electronics is done.
I'll keep you informed about the results.

To keep a long story short ;) , I want to come with complete data.
Kind regards,
Yits.

t5rrr
Posts: 128
Joined: Thu Nov 26, 2009 1:17 pm
Year and Model: 1994 855
Location: Dublin, OH
Has thanked: 0
Been thanked: 0
t5rrr

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

Post by t5rrr » Fri Nov 27, 2009 8:34 am

Very interesting! A+ for effort and brain cells put into this exercise.
Can't wait for the preliminary test results :D

*subscribed to thread
Wagon Brigade >> 94 855 NA | 97 Subaru Impreza OBS | 07 Suzuki SX4
Previous Bricks >> 90 240 GLE 2.0 | 98 S70 T5A 2.0 | 03 XC90 T6 2.9

razorx
Posts: 31
Joined: Tue Nov 17, 2009 3:55 pm
Year and Model: 855 '96, 854 '93
Location: Amsterdam, Netherlands
Has thanked: 0
Been thanked: 0
razorx

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

Post by razorx » Sat Nov 28, 2009 5:46 pm

Good day everybody.
For me it was a very exiting day.
Finally a possibillity to do some partial load testing.
I had an appointment with a good tuning company that does some serious race tuning as well. So I did not had to explain that it will not emprove te maximum power but only the availability of power at low revs (below 4100rpm).
They have the equipment to do partial load testing, to compensate for transmission losses, e.t.c..

Ok enough talking lets go to the graphs. ;)
The first graph is with 30% throttle opening.
The red diagram is the resulte of the original Volvo VVIS system.
The blue one is the result of my controller.
Image

Now a test with 50% throttle opening.
The blue one is the original Volvo one
The red one is the result of my system.
Image

So at non full throttle opening a power increase of approximately 9bhp, and a torque increase of 20Nm.
This increase is probably, not completely tested yet, availibe till about 75% throttle openingeg

I am very happy with the results. Of course I felt the difference, but finally I have it in hard numbers. AFR no worry by the way. Still OK.

Conclusion: On partial load about 9hp increase and 20Nm,
Quite happy.

Over here it is midnight, so I wish you a nice sleep ;)

Kind regards,
Yits.

And Yes, I would like to sell this. But I dont know the forum rules.
Simply said, I havent read them yet. I will do and contact Matthew.

P.S. Thanks to FastTech for all the time!

tjts1
Posts: 673
Joined: Tue Nov 13, 2007 12:31 am
Year and Model: 96 855 NA 5 speed
Location:
Has thanked: 0
Been thanked: 2 times
tjts1

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

Post by tjts1 » Sun Nov 29, 2009 2:04 pm

Very cool. Thanks for posting this. I really need to look into swapping the VVIS manifold on my 96.
Ambitious but rubbish

razorx
Posts: 31
Joined: Tue Nov 17, 2009 3:55 pm
Year and Model: 855 '96, 854 '93
Location: Amsterdam, Netherlands
Has thanked: 0
Been thanked: 0
razorx

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

Post by razorx » Sun Nov 29, 2009 5:10 pm

Thank you.

I am very happy with the results of the tests (previous posts).

I have noticed that with this analog approach. Next to an inprovement of 9hp and 20Nm under partial load (just where you need it), there is also an inprovement during accelleration. It seems not a lot, but concidering what the car is giving you at partial load, it is a serouous improvement.

An other thing:
During heavy accelleration (with my mod), the air runs at high speed, only small long inlet channel open, high speed of mixture. As soon as the second short inlet channel opens, the fast incoming mixture forces the mixture of the just opened channel to get the same speed.

This was not behaveour by design. ;) Just a little extra.
During testing with various variants we noticed the following:
-AT behaveour, less nervous
-20V 2.0 Engines, Italian models, finally a nice drivable car.

Cars running on LPG
-OMVL milennium, system: Same increase
-Vialle liquid injection system (best LPG system ever) the same
-Vialle, how do you name this in English, evaporating system: a gain, but not as it should be.

I am very glad to have data on paper.
20Nm and 9bhp reletively cheap.
So it is possible to do some N/A tuning.

So N/A tuning is possible without spending a fortune. ;)
Don't expect miracles, but this is a serious improvement.
Kind regards,
Y.

Please feel free to Pm for more information

renns
Posts: 443
Joined: Sat Sep 01, 2007 6:12 pm
Year and Model: 2005 XC70
Location: Kitchener, Ontario
Has thanked: 3 times
Been thanked: 0
Canada
renns

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

Post by renns » Sun Nov 29, 2009 6:04 pm

Very nice work! I wonder why Volvo chose to configure the system in the way they did?

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?

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?
1994 850 5-speed wagon, retired at 400,000 km
1998 V70 AWD 5-speed, retired at 358,000 km.
2005 XC70 275,000 km - daily driver

Post Reply
  • Similar Topics
    Replies
    Views
    Last post