REVO

[Paul-RS]

was more of a ... just in case, handy to know ... Andi.


Im standard for now, but hoping to be chipped again shortly.

I bought one in the GB, as i thought it was worth trying for the discounted price.

[img]images/graemlins/audiS4black.gif[/img]

[Paul-RS]

in the absence of the AmD service kit, which is yet to be set up, what do you use to lubricate it?

i might take mine apart when i have free time.

and we have plenty of viton orings at work for high temps etc. could russle up my own service kit.

[MitchellRevo]

Andy and I modified the Forge springs to fit the AmD valve. It worked great, just a bench grinder and bit off the bottom of the spring and if fits right up. I don't suggest everyone go out and buy the red springs, they are too aggressive if you are running normal boost levels. The blues that Dippy runs are the way to go. No production Revo code needs the reds. I would also use copper lube as it is more heat resistant and works better than even synthetic grease.

[Dippy]

The blues that Dippy runs are the way to go.

Thanks for that vote of confidence Mitch. They certainly cured most (but not all) of the hesitation problems I had been getting.

From what I've seen of the Forge DV-R, it looks to me like an 007 which is supplied with extra springs and a fitting kit.

At the risk of pissing the suppliers off, ([img]images/graemlins/flamethrower.gif[/img]) I find it hare to believe that there is very much difference between the Forge valves, the Hyperboost valves and the Viper valves.

[Paul-RS]

hmmm may go for the blues then when chipped...

Mitchell, copper lube = copper slip ?

either that or I have access to some mega expensive very high temp grease [img]images/graemlins/wink.gif[/img] something silly like £500 quid for 500g pot!

[Andiroo]

I think the lube that Mitch applied was thinner than copper slip, it was the same colour though.

And just to confirm what I said in my previous posts "IMHO anything over 1.55Bar, or indeed holding a steady boost around 1.55Bar requires the red springs."

And further to confirm that I am working with Scott re investigating these issues, especially for any of his customers that would normally use Forge red or blue [img]images/graemlins/wink.gif[/img]

Andiroo

[Nige_RS4]

From what I've seen of the Forge DV-R, it looks to me like an 007 which is supplied with extra springs and a fitting kit.

I think the big difference is that the DVR hass a diaphragm and not a spring/piston. The marketing blurb is that the diaphragm has a quicker reponse that the piston type.

Nige.

[Paul-RS]

... and can disintergrate... hence spares... [img]images/graemlins/blush.gif[/img]

[JJRS4]

Have to say that I like the sound of the Revo remapping software. Their web site says you can try it for a few hours. If you like it, you pay and keep it, if you don't it reverts. No-one else offers that.

[wazza]

Have to say that I like the sound of the Revo remapping software. Their web site says you can try it for a few hours. If you like it, you pay and keep it, if you don't it reverts. No-one else offers that.

First it's brakes, now you like the sound of a chip. Will it stay standard forever Jeremy? [img]images/graemlins/tongue.gif[/img]

[dog]

No REVo down here but APR is doing good business. Unfortunately APR does not have RS4 program. Of course I am not sure if I would change my current Wetteraurer chip anyway. But wouldn't it be great to have MTM on my chip as well? For those high take off times?

[MitchellRevo]

Copper lube...slip, stuff. Not sure, I bought a tin of it at German Swedish and it's in a blue container. Redline make a great synthetic grease but I like the copper stuff better.

On the springs... Just remember there is pressure on both sides of the DV. In a perfect world this pressure would always be equal and a very weak spring would suffice. In most instances these pressures are indeed very close and there is no need for a super tight spring. The problems start when you start having compressor surge and the like. The intake is volumous (is that a word?) and it takes time for pressure to equalize. Obviously the pressure right at the throttle valve is going to get quite a rush of compressed air quickly and it will last until the N249 valve actuates the DV. Sometimes this pressure can be so severe it can force the DV to open itself, even when you are not coming off throttle. This is not near as much of a problem as you may expect if you are running sane amounts of boost. Andy is now running 1.55 BAR at tick over (just kidding, please, no hate mail!). But as with most things, only run what you need, there is no need for overkill. If you think you are suffering from the DV opening, borrow someone’s blue or in extreme cases red springs. It will make shifts more unpleasant, but it will tell you if they are opening as you go through the rev range. Also don’t try to use the red springs in a diaphragm valve, they don’t like it. I used blues and they were not enough so I went back to piston type. In all honesty I think I like the piston ones better now. I don’t care much for coming off throttle anyway!

[Dippy]

Mitch,

I am certain that what you describe is different from my problem. I was having a situation whereby I would be on light boost, getting ready to overtake, then not be able to do so, so I would lift my foot so the DVs would open. Then I would get my chance and accelerate, only to find that I had no boost for a few seconds, before suddenly it would come in with a rush.

I reasoned that maybe because of the weak springs, the valves were being forced to stay open when I accelerated hard because of the air flowing through them. Does this make sense to you?

The blue springs virtually cured this problem. I say virtually because I did get one minor case of hesitation since I fitted them, but nothing since.

I can't say that my shifts are any more unpleasant since I fitted the blue springs though...

[MitchellRevo]

The velocity of the air would need to be damn quick for that to happen but it is certaily possible. Just out of curiosity are your valves positioned with the input line facing up or facing each other? If the pressure side is working against the bottom of the piston it is not as good as if it is working against the side.

When I had the blues I didn't notice any shfting issues either, and to be fair the reds don't seem to have much but I can tell a difference when coming down from very high RPMs. But I am certain that bleeding off over 2 BAR would tax any recirc system. It would be a good test to log boost pressure with the valves in both positions, the next time someone is maintaining the valves the should try it and post up the results.

[Dippy]

Yes I agree that it seems hard to believe that the air velocity would be high enough but it's the only explanation I can think of. I also have the APR bipipe with the enlarged ports so maybe the air mass is a bit higher?

My DVs are definitely fitted the correct way (air pressure to the side of the piston, not the base).