All Things Mk5 > R-Tech Zone

Stage 1 results and mods questions..

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Norfolk Ollie:
Holy moly 350 lb torque..  :jumping:
That sounds mental! I've been quoted £50 for a second hand oem dp/sc unit plus fitting, so a lot cheaper than a performance set up. How much 'throatier' is a performance dp? I've been toying with the idea but £500 is a cost, especially if it pi*$es the wife off!

AJP:

--- Quote from: Norfolk Ollie on September 17, 2016, 08:31:20 pm ---Holy moly 350 lb torque..  :jumping:
That sounds mental! I've been quoted £50 for a second hand oem dp/sc unit plus fitting, so a lot cheaper than a performance set up. How much 'throatier' is a performance dp? I've been toying with the idea but £500 is a cost, especially if it pi*$es the wife off!

--- End quote ---
I can't say for sure (I went from stock system to a full Powervalve) but I'd imagine it'd be marginally louder and deeper if you fit it with the stock cat back. A precat delete will also be a bit louder and deeper than stock, but maybe to a lesser extent. Problem with the stock dp, precat delete or not, is that it's puny, maybe not even 2.5". That is fine if you never want more than 1+ kind of peak power.

To be honest, you can't go wrong at 50 quid if you're staying at 260ish bhp. But (two buts)... you're fitting a second hand part, so there's inherent risk there. And if you think you might get the tuning bug and want more in the future, the time to fit a bigger downpipe is now.

Just to make your decision even harder, my full Powervalve (95% of its gains coming from the dp and cat) and subsequent R-Tech map, netted me 345lb/ft. Thats before I'd even fitted an uprated pump. Only other mod was the Pipercross (add maybe 5lb/ft for that if you want!) You can buy the Powervalve dp and cat to mate to your oem cat back.

Boils down to your end goal and budget. Make your big decisions now. Welcome to the top of the slippery slope!

Norfolk Ollie:
Haha yes the slippppppppppppppppppppppppppppery slope!
If noise and cost wasn't a factor then I'd get a dp no worries. I'm getting the oem dp off AKS tuning and they're fitting it so I feel very confident in their hands.
It's funny- I was watching a top gear from 10 or so years ago and they had the astra vxr, megane sport and mk5 gti on there and he calls it the 'chaos theory' that the vxr has 240 ish bhp is going through the front wheels! I guess the mk5 can handle it better than the astra as I haven't seen many posts on here about torque steer issues..

Sure you've seen it but..

AJP:
Haha, yeah I'm sure I watched that one. A mate of mine had a VXR and it was certainly nippy. Really don't get much torque steer with the mk5, you're right. Maybe on the very rare occasion when mine grips in 2nd it'll pull a bit, but nothing major. I tend not to floor it unless I'm at least in 3rd anyway.

Things have moved on a bit though haven't they. My memory's terrible, but I'm guessing it was the mk2 Focus RS that really kicked things off again. Don't think there was anything else putting out 300bhp in terms of front drive hot hatches around then?

One thing though, as much as the headline-grabbing stock bhp figures make good reading, standard cars are mapped really tentatively when it comes to torque. So you get stock cars with 300bhp/300lbft, but then tuned 'lesser' cars with 280bhp/360lbft... I know which I'd prefer!

You'll be looking at a peak of 335-350lbft with the precat delete, pump and map. Although it is literally a peak (the k03 can't sustain it up at 5k and beyond), look up the torque figures for a stock VXR, which on paper is not much less 'powerful'.

Norfolk Ollie:
Very true! Thanks for your help with this fella- if I think of anything else then I'll add to the post. Cheers again!
Ollie.  :happy2:

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