Qwestion to all you turbo owners

[Phat VR6 3]

If I where to go turbo is there anyway that i could run 10psi for daily use and then turn it up to say 20psi when I feel like it from inside the cab?

Would it just be a case of turning up the boost or do you have to change the maps to suit.. Is this possible? Can it be done on a standard ecu or would you have to have 2 maps to swap from 10 to 20 psi.

Cheers Tom

[UnitedMotorsport 55]

All possible, and no need to change the maps.

[Phat VR6 3]

So how does it add the extra fuel for the added boost? The MAF sences how much air going in and then tells the ecu to add fuel to suit?

[UnitedMotorsport 55]

In simple terms, yes

[Phat VR6 3]

ok thanks

[UnitedMotorsport 55]

You can also have switchable maps in the standard ecu, but its certainly not needed to handle diffrent boost levels.

[Phat VR6 3]

So what would be the reason for 2 maps?

And how you getting along with developing a RHD turbo kit?

[UnitedMotorsport 55]

Theres many reasons for using multiple maps, Watermeth injection for example.

Currently working on the MK3 VR6 RHD kit.

[ben_notts 0]

alot of tuned jap motors have those apexi variable boost controllers for that exact reason so when you fell like going for a blast crank it up an then when you return to a city run it on low boost

[ben_notts 0]

just found this about the apexi one - read about them mainly about jap tuners though so im not sure about interactivity.

found a shop in the uk too - http://www.temple-tuning.co.uk/apexi-avc-r-boost-controller---uk-stocked-apexi-avc-r-162-p.asp

some other blurb.

''The AVC-R also includes a Scramble Boost function which allows the user to momentarily raise or lower the boost level at the push of a button. Raising the boost level is commonly used when an extra burst of power is needed (ex. entering a freeway). This feature can also be used in drag racing. The driver can set the main boost level to a low setting for maximum traction then, once full traction is achieved, the scramble boost can allow the vehicle to boost full power.''

[rigs 0]

The AVC-R is excellent.... Don't pay £290+vat for one though!

I got one from ebay brand new for £220 inc delivery. Plenty of sellers on there.

The avc-r has per-gear boost settings too

[FishWick 21]

Yeah still haven't got round to installing my AVCR yet. Need to figure out a nice way to install the stupidly loud solenoid to stop vibrations.

It's not plug and play though, as in "I want to set and hold 15psi of boost". You need to figure out the duty cycles with lots of trial and error. Good kit though....

As for multiple maps, no real need with petrol. Best example would be an automatic switching map if using E85 bio fuel as it needs to run much richer (9:1 AFR).

[407BHP VR 2]

I have had an avcr in my vr6 for over a year now and you cant realy set boost in gear but you can alter duty in gear !

Not recomended for the DIYer

http://i198.photobucket.com/albums/aa249/vr6highline/kierons011Medium.jpg

[Phat VR6 3]

Can't get my head round the fact that you can run a VR at 250bhp and 450bhp without changing the maps. Thought you would have problems with it running lean or two rich

kev havn't you ever turned the boost up to see what its like at 15- 20 psi? Id be tempted if it was as easy and it sounds.. Also whys this avcr not a DIY jobby.. How have you set yours up

[407BHP VR 2]

I didn't i give up in the end after running 2.5bar of boost and went to a local porsche place were the dyno operatorset it up for me he has a honda civic thats 700bhp and uses an AVCR in the honda

[FishWick 21]

Can't get my head round the fact that you can run a VR at 250bhp and 450bhp without changing the maps. Thought you would have problems with it running lean or two rich

In simple terms' date=' the fuelling is proportional to the air mass detected by the air flow meter.

So long as the MAF has enough flow, it will work fine.

If you're using a standalone, it's very easy. Certain elements of tuning are linear and can use standard maps which will work fine. And if you run full closed loop with enough adjustment authority, then it will autotune itself.

Think of an old SU carburettor. More air drawn in = more fuel and ignoring the complications of timing for the moment, it really is as simple as that.

A good in car fuel pressure guage is wise too because fuel pressure should rise proportionally to boost too.

kev havn't you ever turned the boost up to see what its like at 15- 20 psi? Id be tempted if it was as easy and it sounds.. Also whys this avcr not a DIY jobby.. How have you set yours up

Yeah I've run 15psi briefly and it was quite amusing :-) I don't run any more than 11 to 12psi daily because I don't want to break the gearbox. It was just a simple case of opening the bleed valve a bit and nothing more. The map compensates accordingly.

The AVCR is DIY. The only thing that needs a bit of patience and experimentation is setting the duty cycles so that the boost doesn't over shoot the target, or doesn't take too long to get there etc etc. it's not rocket science :-)

[407BHP VR 2]

If you just want to use it as a bleed valve it is straight forward but putting your rpm and speed in is not so simple once that is done it learns the duty its self be warned its not simple !

[FishWick 21]

The instructions are a bit pony too :-)