Revo 4-Bar

[NeonGTI]

When I got my Revo done Matrix was out of 4 bar FPR's, so I decided to just use the stock 3 bar for the time being and pick one up in Calgary. Guys on the Vortex said it was fine to run the 3 bar, so it must be true.

Today I finally got around to installing it and it certainly made a difference I could feel. There used to be a little low RPM lugging, no longer with the 4 bar. High RPM power has a LOT more pull to it, and the power curve in general is an awful lot smoother.

I would advise anyone thinking of Revo'ing to do up the 4 bar program and make sure they have the 4 bar FPR.

I'm also running a tank of Can. Tire premium deer-piss right now. I can't wait to re-load with Mohawk 94 tomorrow morning.

Also, I would recommend hitting up C1 for the FPR. It took them an extra day to get it from the dealership, but C1 charged me a little over $100 for it, and Glenmore Audi wanted $119.

Can't wait to get the stock N75 out of there.

[T is for Turbo]

Re: Revo 4-Bar

did you try the 3bar before going to the 4 bar? i've noticed none of you guys went with the 3bar, why is that? is there an increase in performance when going to the 4bar?

[1.8Trip]

Re: Revo 4-Bar

I noticed a slight difference in the uppper rpms between the trial and 4 bar that I purchased. Of course it could be just me thinking that it was better. I do notice that fuel economy hasn't changed in either city or highway driving.

NeonGTi, I put the stock N75 valve back in and so far I like it better. It seems to not peak as high and quite as fast but I think it holds higher boost in the upper rpms. I suspect that there is more area under the boost/torque curve. Thus, more useful hp. It does not seem as torquey, but is smoother overall than the J (at least in my car). I'll have to run a log to see if there is an appreciable difference.

[Aleks]

Re: Revo 4-Bar

How much did you get your J for, and where?

[NeonGTI]

Re: Revo 4-Bar

I didn't try the 3 bar program as I was pretty much convinced that I wanted the 4 bar. According to Revo the 4 bar makes about 10 hp and 15 lb/ft more than the 3 and they don't charge any more money for the program. Sounded like a good deal to me!

I have a feeling that the stock N75 will be the way to go in the end as there is quick a quick onset of power at part throttle even with the stock N75. I can only assume that the slower-to-react H and J valves would make it even more difficult to control under certain circumstances.

I also have a boostvalve kickin around that I may try.

So much for the GTI being the 'daily driven dont piss around with the car' car.

[1.8Trip]

Re: Revo 4-Bar

How much did you get your J for, and where?

I think it was just over $100 from the Audi dealership. I have the receipt at home. I'll check later for you.

[T is for Turbo]

Re: Revo 4-Bar

I didn't try the 3 bar program as I was pretty much convinced that I wanted the 4 bar. According to Revo the 4 bar makes about 10 hp and 15 lb/ft more than the 3 and they don't charge any more money for the program. Sounded like a good deal to me!

yeah, the program doesn't cost anymore, but its another $100 for a 4bar fpr. and if its another $100 for 10hp and 15 lbft, then thats still a good deal. and does matrix charge anything for installing the 4bar fpr?

si all this discussion about n75 valves, is it better to use the stock n75 valve? does using an H or J cause surging?

[T is for Turbo]

Re: Revo 4-Bar

can someone also explain what all the high and low boost settings mean on the sps3?

[1.8Trip]

Re: Revo 4-Bar

i saw the best diagram on another forum. i'll try and find it for you.

[1.8Trip]

Re: Revo 4-Bar

k, i found it

[T is for Turbo]

Re: Revo 4-Bar

so i've read about a timing setting also. for example, someone was running on highboost 7 and timing 6. what does that mean?

do you increase timing and boost when you're running high octance for more power and decrease it when you run lower octane and less power??

[Kor]

Re: Revo 4-Bar

Part of me can't believe they just sell this thing to anyone off the street, sooner or later engines are going to start to die...

[Khyron]

Re: Revo 4-Bar

If you set it to 9 HB 9 Timing, the car will retard itself down. You need the race specialty program which bypasses the factory safety specs (with which you then can blow up your engine).

The disadvantage to just setting it high and letting the car figure it out is the car will drop far below what you could get. Ie, you put timing 7, the best you can really pull is 5 (maybe 6 on a good day) but the car will dump you down to 3 or 4. And it will stay there for quite awhile before the adaptation creeps up.

You're supposed to keep increasing the timing until you see retarding in 2 blocks (I forget which) then go back down 1 step. Exhaust/DP largely determines how high you can go for boost, octane for the timing. Default Revo program is LB9, Timing 4 or 5 I believe.

Khyron

[1.8Trip]

Re: Revo 4-Bar

Yeah, the blocks are 022 and 023. They show the timing retard in cylinders 1&2 and 3&4. I still can't find anything on what values you want to see before pulling the timing. I've heard values over 3, but I haven't been able to find any other confirmation on that.

If you set it to 9 HB 9 Timing, the car will retard itself down. You need the race specialty program which bypasses the factory safety specs (with which you then can blow up your engine).

The disadvantage to just setting it high and letting the car figure it out is the car will drop far below what you could get. Ie, you put timing 7, the best you can really pull is 5 (maybe 6 on a good day) but the car will dump you down to 3 or 4. And it will stay there for quite awhile before the adaptation creeps up.

You're supposed to keep increasing the timing until you see retarding in 2 blocks (I forget which) then go back down 1 step. Exhaust/DP largely determines how high you can go for boost, octane for the timing. Default Revo program is LB9, Timing 4 or 5 I believe.

Khyron

[Tuna]

Re: Revo 4-Bar

Part of me can't believe they just sell this thing to anyone off the street, sooner or later engines are going to start to die...

Hehe, this is why I do believe there is such a thing as TOO MUCH tunability.