Category Archives: Project Cars

The Volkswagen MK7.5 R Dyno-ed

Forget what the brochure says, we put the new Volkswagen MK7.5R on the dyno.

The question that we are going to address is, how much improvement of power vs prior generation of MQB platform MK7R. Its busy day for me and more things to do before end of the day so I will keep it short

Lets take a look at the graph of two different dyno – Blue belongs to the new MK7.5R and the red one belongs to MK7R (my car). Both cars have clocked under 1,000km for dyno, using Ron 97 fuel with equally stock hardware. My 0.02 cents;

  1. 7.5R is rated 310ps but detuned to 290ps in Malaysia and runs 277hp on the dyno – which gives us around 5.5% power loss. Don’t ask me why some use 15% powertrain loss to calculate BHP or how a GTI from 230bhp to 340bhp;
  2. I noticed that the 7.5R is choking at the end of the RPM, i reckon it needs more air;
  3. My datalog (no time to study thoroughly but i recall very briefly) the intake air temp is on the high side and we should get a better HP with better temp;
  4. Note also the AFR is a little bit lean and from my logs, the Golf R is pushing 1.3bar boost stock – will look a the data again later;
  5. Overall, i find the transmission on the 7.5R much smoother than the 7R DQ250 but I did not do a full out test mode – why? because contrary to believes, the car is NOT MINE.

However, I would like to get one to do FULL ON test mode but I guess that’s going to be tough unless someone kind enough to lend me for a few days – free stickers for you ok?

The question that everyone is asking – how does the Golf R benchmark against the Honda FK8R?

A few months back, I had a FK8R for a few days – I did say that I am going to compare the car, but this is not a review – at least not now. Based on this chart that i extracted from the same dyno; my 0.02 cents again;

  1. FK8R peak power (green) seems to be higher than Golf R (blue) but from early to mid range, the Golf R seems to be better than the FK8R;
  2. It does felt the the FK8R has more power at higher RPM when I drove it;
  3. For drag, I reckon both cars will be quite similar depending on the distance – 200m, launch control, I think the Golf R will emerge as the winner but anything more than 400m, I believe the FK8R may have advantage.

Anyway, that’s just my very tip of the iceberg view – without looking at data / performance boxes, its hard to make a conclusion – heck, I did not even push the Golf R through corners but I do note that the 7.5R feels more agile vs the 7R – something I noticed at Nurburgring too.

Till the next update.

 

Volkswagen Passat B8 2.0T Data Collection using VCDS

Saturday afternoon, bored so decided to collect data for the Passat B8 2.0T from VCDS and made some graphs but I didn’t have enough space to go above 6000rpm. I believe the gear ratio for the Passat is similar to the Mk7 GTI and with 4th gear max speed touching 220km/h (i think, because my eyes glued on the road at that speed) while the MK7 Golf R only manages 180 km/h.

Special thanks to Wing Hin Autohaus for lending me test drive unit and here’s the Passat Stock Boost Request Vs Actual.

Air Mass is a bit strange but I can’t conclude without first testing different air intake boxes. Max Mass Air at 668 kg/h – i recall briefly that the tuned MK7 gets above 800 kg/h and with aftermarket intake above 900 kg/h but given that this is a very lazy Saturday afternoon, I decided to check it out another day 🙂

The timing retard on the car looks good i.e. there are no timing retard, I doubt the manufacturers will remove timing limiter so lets assume that even on RON95, there are no cylinder knocking or at least we can conclude the car is healthy (did I mention that this is the same car that was maxed out giving taxi rides on Mcclubz Speed Junkies day?)

The other thing that I normally checked is the intake air temp. As usual, stock intake air temp around 55 degrees, normally anything above 60 degrees and car loses which I am pretty sure I saw on most 1.2TSI. Maybe I will go out and get some logs on the 1.2 next round when I am bored. 🙂

Note that both boost / air mass / intake air temp logs are different runs – they don’t tally so don’t get excited. Another thing to note is that, I wasn’t able to go above 200km/h on the Passat on the stretches which i normally tested the cars – ok lah, I test my Golf R there but still, I was expecting at least 200km/h. OK lah, there were more cars than usual but i failed to do a 100-200km/h race logic log…… maybe I will try another day then.

Motorsport Project for 2017

I used to blog a lot under my own blog page at iamk3v.com but I find it difficult to draw the line between personal rant and what I post for sharing in the club so here we go again. I intended to start with a few DIY stuff and etc but I need more material before I start so that is currently KIV.

Anyway, our motorsport project for 2017 story continues with the Mk6 GTI, which I admit that we have neglected because of the focus on MK7 Golf R and also because it is more cost effective to work on 7R than the 6GTI. The strategy paid off as we managed to beat the record of 2.24s set by the MK6 Golf R with a 2.23s lap time with much lesser mods.

A little history on the Mk6 GTI aka Fatboy which we have named him such earlier – to be frank, I am not very good names so don’t give me crap for funny names, was meant to be a track focus car with its wider body and handling setup. The project was a collective effort from the owner and myself, an entry to Motorsport from the club’s level, in short, this is a VWClubMalaysia track warrior alongside with the MK6R and before the Mk7R came into light.

We did pretty well in 2015, a second place ZTH Time to Attack Euro Street Category, clocking 2.34s on the Yokohama AD08R with Boy Wong behind the wheel before its clutch burnt and ended our journey; or rather a new journey begins. I personally love the GTI, the power from REVO Stage 3 Ko4 330hp was more than enough for spirited driving and light tracking but with the widebody, i personally felt that it was overwhelmed.

Overwhelmed because we should have more power to match the wider grip and etc. Imagine a stock standard GTI with a similar mods doing 2.35 vs a pro doing 2.34 on a widebody. Facts don’t lie, its apparent that what we did on the GTI is not smart, but life is always a learning curve.

I have a confession too that I was aware of the clutch issues prior to the race, but I took for granted and on top of my head, 2.34 should seal the deal. I underestimated the competition and a Scirocco GT beat us with a fraction of second and coming to second heat, the clutch was gone and there is nothing much we can do; noob mistake and hopefully we don’t repeat it. If the car is not fit, we should never run it; inside the track, at 50 plus degree, wear and tear is guaranteed.

The dying clutch actually kick-started the entire project in 2016, basically the GTI was ripped apart; the ko4 sold, the KW clubsport sold, brembo brakes sold, intercooler sold…. but in the end, the money went to the 7R! It was a tough call but right one because it will take too much time to rebuild the engine – because we are going for bigger power and check wear and tear. It will be another disappointment to run it and come short again.

The escalating USD is making this project a little hard to take off – our motorsport “advisors” have in fact advised to direct the fund towards the 7R, which now suffers fuel starvation and to go even faster, we need to lose weight which is something that I am reluctant to do. Also, this has been our project since 2015 and if I don’t work it out, its like breaking a promise, so for 2017, here’s an overview of the plan;

  1. Engine Rebuild – new pistons, new connecting rods, new valvetrain kits, new arp bolts;
  2. New Turbo – still considering options GTX28 / EFR6758  / GTX30 / EFR7163 and to be detailed in next post;
  3. New set of coilovers;
  4. New Brake Kit – likely to settle with endless brakes;
  5. A new set of intercoolers;
  6. I think I sold the intake too;
  7. Racing Seats;
  8. New clutches;
  9. New exhaust system;
  10. Maybe change the meth kit;
  11. Maybe new intake manifold.

Till the next update!