Roomster 1.9 Tdi modifications

[Julian Edgar]

Stopping distances felt shorter too. Not sure why when the tyre is the limiting factor?

Yes, it's an interesting point. After modifying quite a few cars' brakes, I think it's because you can brake so progressively to the point just before lock-up (or ABS actuation). In an emergency ABS stop (which I tested), the stopping distance was (of course) no different to the standard brakes.

[monkeysrus]

From EBC website:

'Tested at the UK Motor Industries Research Association (MIRA) in witnessed tests early Redstuff reduced car stopping distance in tests by almost 50 feet from 100 MPH offering a staggering 30% brake improvement.'

You get a higher friction coefficient with the reds and i assume much better control at higher friction points and for longer duration. Maybe this is a reason for better stopping distances? Would be interesting to get a proper explanation.

[Jarred]

Why did you choose Redstuff, over a perhaps more daily driver friendly alternative, ie Greenstuff. IIRC, They have pretty much the same hot temp rating, but better to use when cold etc. (just curious)

I've read more than a few autospeed articles before, and they're always great. I do enjoy them! WElcome to the forum too. Always nice to have good technical based thread popping up.

Did you think about running no muffler at all? (as opposed to a new one) What about the rest of the exhaust? Still standard?

I've got a mk 3 1.9 TDI that I'm getting on the road soon, and I'll be looking to get a couple extra neddies out of it as well. (along with various other upgrades ie brakes, susp etc)

[Julian Edgar]

Why did you choose Redstuff, over a perhaps more daily driver friendly alternative, ie Greenstuff. IIRC, They have pretty much the same hot temp rating, but better to use when cold etc. (just curious)

Mostly local distributor's advice - previously have run Greenstuff on a less hard-driven car that also had regen braking (turbo Prius)

Did you think about running no muffler at all? (as opposed to a new one)

I tried no rear muffler first. Too noisy for me.

What about the rest of the exhaust? Still standard?

Yes.

[whiteVR6]

Is the tune from Powerchip?

[Julian Edgar]

Yes the tune is from Powerchip. It was done live on the dyno in front of me, with all questions I posed answered in some detail. I thought the result was outstanding.

Disclaimer: it was done free of charge... part of a long (10+ years) history where in AutoSpeed stories I have been heavily ciritical of Powerchip. I asked them if they wanted to show what they could now do and they sure did do just that.

[gerhard]

The reason you haven't got shorter braking distance is probably due to the bigger rotors, heavier wheels and tyres creating longer braking distance, with the better pads restoring the status quo.

The greenstuffs would have been better choice, but as long as you are aware of the characteristics of the reds there's no real problem.

Have you still got the Pog GTI?

We should pair you with APMitchell - god only knows what the pair of you would conjure up together

[Julian Edgar]

The reason you haven't got shorter braking distance

I don't remember saying that? Stopping distances in normal use are far shorter than with the standard brakes. Emergency (ABS) stopping distances are the same (or thereabouts) - that distance is not really dependent on brakes*, but instead on tyre/road grip.

(*ie you need only sufficient brakes to lock the wheels)

The Polo GTi is for sale (very cheap!): http://tiny.cc/xweoh

[gerhard]

Yes, it's an interesting point. After modifying quite a few cars' brakes, I think it's because you can brake so progressively to the point just before lock-up (or ABS actuation). In an emergency ABS stop (which I tested), the stopping distance was (of course) no different to the standard brakes.

I don't remember saying that? Stopping distances in normal use are far shorter than with the standard brakes. Emergency (ABS) stopping distances are the same (or thereabouts) - that distance is not really dependent on brakes*, but instead on tyre/road grip.

(*ie you need only sufficient brakes to lock the wheels)

The Polo GTi is for sale (very cheap!): 2006 VOLKSWAGEN POLO GTI 9N MY2006 Private Cars For Sale in NSW - carsales.com.au

Maybe I misread that bit

[Jarred]

Did you mention the power it's putting out?

(or did I miss that?)

[Julian Edgar]

I guess I wasn't very clear.

No brake upgrade will make a difference to the emergency stopping distance (ie with car ABS'ing), so of course my larger discs and different pads / calipers haven't changed that.

My normal stopping distances, where I am modulating the pedal, and including multiple hard stops made one after the other, are clearly much shorter.

[Julian Edgar]

Did you mention the power it's putting out?

Up around 20 per cent over most of the rev range.

[stevebucknor1]

I roughly calculate you are indirectly responsible for me blowing up several engines, turbo's, drivetrains, diffs and even being banned from my surf club back in my youth when I sooped the bejesus out of the rescue rubber ducky outboard for my mate who raced them. There's also the matter of all those many , many unused Jaycar parts. It is really amazing and outstanding.

[Ozsko]

Julian, do you stand by them Powerchip) in light of recent internet forum comments in other places? It seems very difficult to get a balanced view on this.

[Julian Edgar]

Julian, do you stand by them Powerchip) in light of recent internet forum comments in other places? It seems very difficult to get a balanced view on this

Yes:

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