VVIS controller 850

Post by **FLXC90** » 22 Jan 2016, 08:39

search the database for post from user ben850, he has/had a controller on one of his cars, and the write-up was in here. Check the performance/mods sections

Post by **erikv11** » 22 Jan 2016, 08:49

He's right, ben850 has a ton of posts about this.

https://www.matthewsvolvosite.com/forums ... hp?t=52574
https://www.matthewsvolvosite.com/forums ... 1&start=42
etc.

jantt · Post by **jantt** » 22 Jan 2016, 09:02

Have written to Ben850, but no answer yet.
Have now joined volvospeed and written to razorx there.

jantt · Post by **jantt** » 23 Jan 2016, 07:25

Got hold of razorx on volvospeed. He doesn`t make them anymore.

jantt · Post by **jantt** » 23 Jan 2016, 11:14

razorx just told me that because I have one of the first 850`s then his switch will not help my car.
I don`t loose power in low rpm. It`s the later models.

Post by **erikv11** » 23 Jan 2016, 11:22

Interesting. Great to get info from an expert.

Post by **precopster** » 23 Jan 2016, 13:29

Can he supply you with the circuit details?

I think the mod was pretty effective From memory the factory setup opens the 2nd stage at 4,000 revs and can be a little flat in mid range.

Razorx's setup broughr that shift point down and gave greater midrange torque.

Perhaps something simpler like extra vacuum at the solenoid will do the trick or a vacuum pump activated by a relay at 3,000 tevs (you'll still need a circuit board)

Edit: just realised that you don't need this now. Great info

jantt · Post by **jantt** » 25 Jan 2016, 05:30

Did two other things this morning :

1. Disconnected the tube from exhurst manifold to airfilter and screw the plate that allows hot air into filter closed, so only cold air comes in.
2. Changed the intake tube that leads air into filter with a bigger 76 mm.

These two things gave better response.
Now that I got more and colder air into the engine would bigger injectors then help if the old ones has reached their limit ?

Post by **erikv11** » 25 Jan 2016, 09:33

Different injectors make zero difference unless the ECU is reprogrammed to change the fuel delivery. And there is no tuning that I know of for NA ECUs.

Since you live in the far north, be careful with that airbox mod if you do long distance driving, rarely it can result in a frozen throttle body. If you do short drives that frequently change the throttle position then there is no risk at all.

jantt · Post by **jantt** » 25 Jan 2016, 10:08

I only drive short trips (normaly less than 20 miles - in the summer some times longer).

I still have all the old parts and can change it back in less than 15 min.

Just wonder if the standard injectors are limit to deliver a small amount of fuel and then bigger ones would do more.

VVIS controller 850

Re: VVIS controller 850