All Things Mk5 > R-Tech Zone

Stage 1 results and mods questions..

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Norfolk Ollie:
Hi there, I had a stage 1 done on my bog standard (or so I thought) MK5 GTI a few weeks back.
I must say I was really impressed with the guys I spoke to there and they clearly know their stuff!
I made them aware that I thought my DV was shot as I was experiencing loss of power and a hissing on acceleration but it wasn't a problem as they had them in stock so put it on the ramp and checked it. Yep as suspected the revision B DV was shagged so they changed it for a rev G. Great I thought- now let the fun begin..
I was then asked over to the car and it was pointed out to me that the car had a cheap aftermarket cat fitted which will be restricting flow no end and would limit the power outcome after the map.. Bugger!   :surprised: Thinking that was bad news I was then informed that the engine sounded rather rattly, which could be a VVT issue.   :scared:
I was then told that AKS tuning would be the only place they'd recommend to carry out the work- sounds expensive!  :scared:
Re map day was turning into sh*t your pants day as the potential cost of this swirled around in my head.
Anyhow it went on the rollers and produced figures of 191 bhp, 232 lb torque before and 231 bhp and 277 lb torque after. The cat was indicated as the reason and I later noticed that the car previously failed an Mot because of the cat 'desintergrating'. They obviously just had a cheap one stuck on then sold the car.
I took the car up the road and it made me grin like an idiot! The difference was unbelievable- if they'd told me it was 250bhp, etc then I would have believed them! I asked them if I'd need a map tweak after getting the cat and cam chain issue sorted but they said it wasn't necessary. Hats off to Ben who then went to the trouble of calling AKS and arranged for me to call in on the way back to East Anglia for them to have a look, which I did and a cam chain tensioner service was advised and booked in for October. I was also advised to get the oil changed and the sump cleaned out as there was a lot of carbon gunk visible in the oil filler cap opening and do a pick up pipe service too. I'm also getting them to put an oem cat and DP fitted with the pre cat deleted. I'm hoping that this will help things flow better but I'm now wondering about the other options available. Overall I'm really pleased with R-tech and with what they have done with my car!
If any of you can help with these questions then I'd be really grateful thanks..

1- I'm assuming the ECU will adapt to the new cat and DP but what sort of bhp and torque am i looking at getting after these done? Will it bump the car's power up to where it should have been been if they'd been on when it was mapped, i.e 240-250BHP or did that cheap cat compromise the cars potential on the rollers?
2- Is it worth getting a loba hpfp fitted while I'm there? I have enquired about this but haven't received a response. I could get a performance DP and sports cat done too but cost is a factor.  If you had to choose between a sports cat/DP or a hpfp which would you go for?
3- Would I need an up rated clutch or would an oem one handle things ok, if I went stage 1+-2, when the time comes to change?

Thanks for any help on these guys- cheers, Ollie. :happy2: :happy2:

AJP:
You should gain some extra power, yes. If the crap cat isn't flowing very well then an oem cat and especially precat delete will aid flow nicely. I'm not sure whether you'd then be reaching the exact same power as if you'd got the map done with an oem cat and precat delete - it could be that Niki dialled back the boost slightly in comparison to one of their usual Stage 1 maps because of the fact your exhaust flow was restricted and high EGTs are not desirable. That said, there is a degree of 'learning' with the ECU, and the extra flow will help bring EGTs down at the very least. 231bhp isn't actually that much down on power anyway, mine made low 240s stock with R-Tech Stage 1.

An uprated fuel pump is a great mod. To get the best out of it you'd want your map tweaking, to what I think R-Tech call 1+. Considering you'd also be adding a precat delete into the mix, you should see good gains over your current power and torque with a Stage 1+ map. Give Ben a ring and double check on pricing - I think going from 1 to 1+ qualifies as a tweak and as such doesn't cost as much as actually moving stages (as I found out going from Stage 1 to Stage 2).

As for the clutch, there's no way of knowing. Mine started slipping once I got up past 320lb/ft, but yours might be ok. Bear in mind, whether you go for the oem cat and precat delete with uprated pump (Stage 1+) or 3" downpipe and sport cat with standard pump (Stage 2), you're still looking at a hefty torque increase. If your clutch is currently coping but just on its limit, it could be that whatever route you next take with tuning pushes it over the edge.

It's probably a good idea to decide your ultimate goal power wise. That way you can think about budgeting for an uprated clutch if you think you'll need it, and doing things in the right order. If you're keen on Stage 2 and beyond it wouldn't make sense to buy an oem cat as you'd need to get rid of it to make way for a proper 3" downpipe. But if you think you'll be happy with about 260bhp and loads of low down torque, go for the oem cat with precat delete, fit an uprated pump, and then get the map tweaked (keeping your fingers crossed that your clutch holds up).

Norfolk Ollie:
Cheers for that comprehensive reply AJP  :happy2:
that answered my questions perfectly!  :congrats:
Do you know much is it to go up a stage fella? I think I read that a tweak is around £90?

AJP:
No probs. From memory it was either £150 or £200 for me to go from Stage 1 to Stage 2, I can't remember. I was expecting it to be £90 as I assumed it was deemed a tweak regardless of what stage you went to. I assumed wrong!

Norfolk Ollie:

--- Quote from: AJP on September 17, 2016, 05:53:19 pm ---No probs. From memory it was either £150 or £200 for me to go from Stage 1 to Stage 2, I can't remember. I was expecting it to be £90 as I assumed it was deemed a tweak regardless of what stage you went to. I assumed wrong!

--- End quote ---

Cheers again  :happy2:
Do you reckon they put it on the rollers again for a tweak? I know it's not all bout 'figures' but I'd be really curious to know what power my car's got after. That's what pi*$ed me off about the cheap cat this time round..  :fighting:

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