Let the tinkering continue.....

[Greg Roles]

what tyres did your car come with as standard? conti's are all asymmetric... well, the performance ones anyway.

i've run a few assymmetric tyres and always liked them (from conti premium contact, to yoko a539's). alas, now i'm cheap and all my tyres seem to be directional only.

I ended up doing Adrenaline Re001's in 235, whch are obviuosly wider than stock, and fill the arches nicely. Larger overall diameter, and the speedo does seem to be closer to correct now. They do feel initially more "squirmy" than the conti's, but I put that down to a bigger bag, and the fact they are gripping like crazy over probably slipping sideways worn out conti's.

$245 a corner fitted. Hopefully by the time these wear out I can afford some 18" mags, saw some charlestons from the Jetta on a GT TDI last week, and it looked GREAT! Have to download the pic from my phone. Just need to find an aftermarket version, as I'm all too aware of the weight of OEM rims.

[Greg Roles]

Been thinking ahead for an exhaust system, did have my mind set on the uber nice but expensive 2.75" Milltek cat back, but I am all too aware just how little power cat back's usually liberate, and the fact the stock 2.5" is full mandrel. The forthcoming JBS DPF delete pipe is only 2.75" anyhow, and it's the dump pipe area, where the exhaust is hottest, that needs to be the bigger diameter if anywhere. So it's got me to thinking.....

Modify the stock pipe! Given I'll be joining the 103kw crew with a bit of soot action, I figure a downswept pipe is the go. Keep the stock twin outlets, but just have them as dummy pipes for the stock look and to fill the bumper hole. Never have to clean them either!

Been looking around for a suitable muff. Diesels pretty much drone below 500Hz just like gassers, but they do have slightly different needs from what I have read thus far. Been researching Magnaflow and other diesel specific muffs, today I found "aero" mufflers, and they are VERY interesting. Seems if you mount it up close to the downpipe, it actually helps evacuate the system. I'm thinking of putting one of the resonated 2.5" versions right up behind the flexi joint post dump pipe, and deleting the stock resonator prior to the rear axle. Dump the pipe to the ground at rear axle level.




Despite obviously being a lot nicer, I just can't see a 1/4" bigger Milltek being $1000k plus better, nor liberating a whole lot more power. Hmmmmmmm

The "XL" version is resonated - but it's just a ceramic interior coating, still a straight through muff essentially. 15cm dia x 66cm long though! Lucky there's a ton of space in the floorpan tunnel, thanks to the R32.

http://www.aeroexhaust.com/

http://www.youtube.com/watch?v=iDTTO...eature=related

[Greg Roles]

[Greg Roles]

Snow performance stage 3 diesel water methanol injection kit ORDERED. Snow reckon it's worth 40+hp on a 2.0 VW TDI at the wheels !!

[gldgti]

Snow performance stage 3 diesel water methanol injection kit ORDERED. Snow reckon it's worth 40+hp on a 2.0 VW TDI at the wheels !!

WOW! thats a big gain!

[Preen59]

Woah that's a substantial increase in powers. Nice.

[Greg Roles]

...and that's over the entire band, on 103kw TDI's, with a more modest Water/Meth injection pattern. I'm interested to see what's possible for say a max dyno effort!

Bottom line is it will assist in tuning the bejesus out of it!

[Preen59]

Should cool your EGT's too right?

Hehe keen to stick 10% in it Greg? I'll send you a litre if you are!

[gldgti]

Been thinking ahead for an exhaust system, did have my mind set on the uber nice but expensive 2.75" Milltek cat back, but I am all too aware just how little power cat back's usually liberate, and the fact the stock 2.5" is full mandrel. The forthcoming JBS DPF delete pipe is only 2.75" anyhow, and it's the dump pipe area, where the exhaust is hottest, that needs to be the bigger diameter if anywhere. So it's got me to thinking.....

Modify the stock pipe! Given I'll be joining the 103kw crew with a bit of soot action, I figure a downswept pipe is the go. Keep the stock twin outlets, but just have them as dummy pipes for the stock look and to fill the bumper hole. Never have to clean them either!

Been looking around for a suitable muff. Diesels pretty much drone below 500Hz just like gassers, but they do have slightly different needs from what I have read thus far. Been researching Magnaflow and other diesel specific muffs, today I found "aero" mufflers, and they are VERY interesting. Seems if you mount it up close to the downpipe, it actually helps evacuate the system. I'm thinking of putting one of the resonated 2.5" versions right up behind the flexi joint post dump pipe, and deleting the stock resonator prior to the rear axle. Dump the pipe to the ground at rear axle level.




Despite obviously being a lot nicer, I just can't see a 1/4" bigger Milltek being $1000k plus better, nor liberating a whole lot more power. Hmmmmmmm

The "XL" version is resonated - but it's just a ceramic interior coating, still a straight through muff essentially. 15cm dia x 66cm long though! Lucky there's a ton of space in the floorpan tunnel, thanks to the R32.

http://www.aeroexhaust.com/

http://www.youtube.com/watch?v=iDTTO...eature=related

looks like a lot of expense to me mate - consider this- i went from a stock 2" press bent stock system including 2 baffled mufflers and a cat, to a 2.5" mandrel bent system with only a 12" louvred 'hotdog' (resonator) and a short, straight through "supercat" rear box. that resulted in basically zero increase in exhaust noise at cruise, and minimal increase under hard acceleration (i'm sure hte noise out the back is a little different, but inside the cabin is no real change).

now, i've increased the turbine outlet diameter from 24mm to 50mm, and what have i noticed??? didly squat. i was really looking forward to a bit of extra noise, but again, maybe a little different outside, but barely noticable (if at all) inside.

if i were you, i'd look at just removing the mufflers you have altogether and replacing with a resonator or two, or go a custom 3" system by a good exhaust shop. like you say, anything after the turbo is really just extra weight

[Greg Roles]

Yeah I see your point. Seems diesels, because of the lower EGT's simply have less noise than gassers. Noise comes from the retraction of the hot gas, so I can see a well designed system working without any muffs at all, but so too do I want to avoid that boomy noise old landcruisers with straight through systems put out. My research on about the only site i can find or have ever heard about says a system of at least 3" is in order, given the gas flows in a diesel to have true low restriction post turbo.

http://www.donaldson.com/en/exhaust/...ary/061237.pdf

Page 8. If I use the max efficiency of 3.0 ( which seems very possible from my research ) I get an intake flow (122"cubes) of 476cfm at 4500rpm.

The corresponding theoretical max is 1198cfm exhaust at a VE of 3.0, even 2.0 gives 798cfm which is a 3" exhaust minimum.

seems excessive, but I agree a big bore exhaust is far more important than a fancy muff, but I do like the science behind that Aero one, but yeah, a straight through hotdog to stop any resonance is all I really need.

The main pitfall exhaust wise is that the JBS DPF delete downpipe is 2.75", and whilst this is plenty big enough, if I truely want next to no restriction, I need a bigger dump pipe. Need to chat to Gav and JBS about that, and tossing up the idea of a parrallel 1" pipe giving 3.75" total, into a 3.5" cat back with perhaps a single big bore jap straight through muff. The jap stuff flows very well overall from what I read. Would only liberate the last 10hp, but heck, if I'm gonna spend the money, might as well go large!

I'm a long way off doing a muff, just tossing ideas at present. Spent my play money on the water meth, as that was a definate.

Oh and Preeny, I'd try 100% nitro injection just for giggles, might have to do a little research on it though!