The diesel Rocco Racekor project.

[C70R]

xjay1337 said:

Set a new PB, 13.6 @ 102.

You know, there's a lot that I really don't like about this car (diesel, FWD, pretend racecar), but there's no denying that you've put a lot of money/work in to make it quick. That's a very impressive time.

[f1nn]

Totally, haters gonna hate and all that nonsense, and although I think it looks a state, there's no denying you've put the effort in to making this a quick little thing.

[xjay1337]

No worries.

I don't really mind some people don't like how it looks. Everything is functional (except the stickers lol)

One of my diesel tuning buddies took a video of my PB run.

https://www.youtube.com/watch?v=MaDKnjR6LE4

Notice the pretty much lack of smoke.

The Mk2 was a VWDRC car and did 12.1 @ 113 for reference.

[C70R]

xjay1337 said:

No worries.

I don't really mind some people don't like how it looks. Everything is functional (except the stickers lol)

One of my diesel tuning buddies took a video of my PB run.

https://www.youtube.com/watch?v=MaDKnjR6LE4

Notice the pretty much lack of smoke.

The Mk2 was a VWDRC car and did 12.1 @ 113 for reference.

I'm not sure what noise I was expecting, but I definitely didn't anticipate it sounding like a wet fart running up the strip. Is that normal for tuned diesels?

[xjay1337]

I guess so? I think it sounds nice and lots of people compliment me on the sound (not that I've really done anything to make it sound nice lol, the exhaust was for flow).

https://www.youtube.com/watch?v=3-NdaoB8Ll0&t=...

That's another video of how it sounds, however that was ages ago, on the stock turbo with a different ECU tune (now the larger turbo has a more deep tone and less whistle)

[ZX10R NIN]

C70R said:

I'm not sure what noise I was expecting, but I definitely didn't anticipate it sounding like a wet fart running up the strip. Is that normal for tuned diesels?

Isn't it the same for most turbo 4 pots I've heard a few diesel fours & once they're up and running they sound no better or worse than a petrol 4 cylinder.

[ZX10R NIN]

xjay1337 said:

Yes they were but it was on both lanes.
I did a day at VW Action last year, and this was a competition test team day, they glued the surface, my 60ft time was about the same. But I also snapped a driveshaft so....

I think if I was running 15 or 18psi I may have saved another 1/10th.

When I fit an LSD combined with semi slicks it will be feasible to get a 2.0 or 1.9 60ft time.

Also my camshafts have arrived. Off to be re profiled! Yay.

Opps yes it will do that if you plan to go to slicks & it's a prep day make sure your shafts are uprated too otherwise you'll be popping another one.

I destroyed my ST gearbox at pod,one hard launch to many saw cogs embedded in the tarmac

[xjay1337]

Yeah, they weren't uprated lol

I am not sure if any upgraded ones are available. My shaft was fine, it sheared at the end where you bolt into the hub.

[xjay1337]

So some of you may have spotted the smokey Scirocco on track on Sunday at Silverstone.

Pics below from Mr Teagles.

CT-14196-(ZF-4963-30979-1-002)-2 by Fat Bear Photography, on Flickr

CT-14062-(ZF-4963-30979-1-001)-1 by Fat Bear Photography, on Flickr



Car behaved itself well.
PS4's were brilliant on the front, stuck well but did feel a bit roly poly.
AD08R were good on the back, back end was dead planted. I think with 245/40 AD08R on the front it will really help.
Currently we are 235/40 F and 245/40 R.

When I ran 245/40 Direzza 03g it was so planted, but they are too expensive for daily use so while I only have 1 set of tyres I think the AD08Rs are a great compromise.

I've moaned about it elsewhere but oil temps are driving me mental.
I am booked in early November with Alex for oil cooler.

Once that's in I should be fine and able to keep on it a lot more.

Also my EGT protection was kicking in a lot, repeated long hard pulls get a bit much for it (understandable really).

i have specified when we port the head we fit oversized valves we are going up 0.8/0.9mm i believe.
Not sure what difference it will make and it's double the price as the valves are around 60EUR each but balls out and all that.

[SirSquidalot]

This looks proper now! Well done!

[xjay1337]

Cheers! Looks a lot more at home on track than it does on the A4074.

[f1nn]

I was just thinking the same actually, especially in the first pic where the wing isn't so obvious.

[xjay1337]

Thank you.

https://youtu.be/7F16tUuTwuY

Some footage from Sunday service

[xjay1337]

I managed to source a complete head for very reasonable money.

IMG-20161101-WA0002 by Fat Bear Photography, on Flickr

IMG-20161101-WA0004 by Fat Bear Photography, on Flickr


I am now preparing to bend over as I've learnt the cost of the work and it's quite high, but better than spending it on drugs, right?

[Freegs]

xjay1337 said:

but better than spending it on drugs, right?

Only one way to find out...

[xjay1337]

Freegs said:

Only one way to find out...

FIIIIIIIIIIIIIGHT?

I am popping down to Surrey Rolling Road on the 12th of November if anyone would like to come say hi / chat / watch loads of diesels being dynoed.

I am meeting up with Bobby (my tuner and performance guru) who has done some more bits to his car and also we are going to run my car without any EGT protection and a very smokey 0.9 lambda map for sts and giggles.

The reason we are doing this is that at lambda 1.1-1.2 we have a pretty clean tune with low smoke (as you can see on the videos from Santa Pod).
When Inlet Temps get hot we do get some haze but not too bad.

We have 880c EGT protection which means after this it cuts fuel to limit EGT to "you can pound round a track all day and not blow it up" levels. (this reduces peak power)

The last dyno run was 255bhp but I think we can see from the increase in 1/4 mile times we have gained far more than that.

In Portugal and Spain some tuners are claiming 275-280bhp, which is what I believe my car is running. However due to airflow restrictions on dyno (you simply can't recreate real-world amount of airflow in a closed room) we hit the EGT limiter early. our Lambda also shows we are physically out of air (due to head restrictions) at our current power.

So we are putting on a race tune and fitting dummy EGT sensor for testing purposes.

[xjay1337]

Oil cooler update.

Due to track related oil temperature problems I wanted a solution. I had an idea and spoke with Alex @ AKS and we decided to try some stuff.

Darkside Developments sell a kit with a Mocal thermostatic plate but the oil cooler provided was a cheap Chinese one, so that was sent back and Alex sourced a Mocal 13 row cooler and kept the Thermostatic plate.

20161110_104249 by Fat Bear Photography, on Flickr

I won't bore everyone with the fitting details but it wasn't exactly "bolt on".

We had to retain OEM oil cooler (OEM is a heat exchanger oil is circulated with coolant) however we had to modify the OEM oil cooler and remove the water feed.

20161110_131937 by Fat Bear Photography, on Flickr

Alex welding the brackets to give the right level of support.

20161110_151626 by Fat Bear Photography, on Flickr

Final fitted position.

20161110_185731 by Fat Bear Photography, on Flickr

We started at 10am and I left the workshop around 8pm. We weren't working on it flat out all day though, but it was a bit fiddly.

We did also fit H&R 28/24 front and rear roll bars. This has really stiffened it up in the corners. Lovely.

Oil temps are much better now. Cruising they get to around 80 and stay there due to thermostatic plate. Even with several hard and long acceleration pulls it barely reached 90 so that's much better. Very happy.

[Dan_M5]

aka_kerrly said:

xjay1337 said:

Anyway, went to Santa Pod yesterday, had a good day.

2016-10-09_07-18-29 by Fat Bear Photography, on Flickr


Set a new PB, 13.6 @ 102.

I'm sure I could get to a 13.4 but I didn't want to break the car and I was happy to finally get into the 13s. Had a bit of luck with launching

Good times, those ought to shut a few people up who think your project diesel is a waste of time.

Loving the graphics/colour combination to.

Why because driving in a straight line echo's the performance of a track car...

[xjay1337]

Thanks for your post Dan. :-)

[xjay1337]

Met up with Bobby on Saturday at Surrey Rolling Road
Had a good afternoon chatting to people.

Due to some of the figures coming out of Europe (claiming 270bhp + on stock cp4 pump) we decided to run a test on my car.

We ran a new map, with a dummy EGT sensor (so no EGT protection)
requested lambda 0.9 (another 5-10% more fuel than before)
(normal tune lambda is 1.1-1.2)

20161112_121707 by Fat Bear Photography, on Flickr

Even with the extra fuel we were just getting extra smoke. Logs show lambda didn't get below 1.08.

You can see the graph before and after here. The pink (better curves) are the new v25 map and the blue ones were the old v24 map.

20161112_122514 by Fat Bear Photography, on Flickr

You can see while we have dumped loads more fuel in, we are now up to over 430 lb ft of torque however power is exactly the same as before, albeit it holds at the top end now (due to EGT protection effectively not working).

Flat power curve is all well and good but further proves no more airflow available.
We are slowly ruling out any mechanical restrictions to downpipe or intake however this further points to prove that airflow through CR170 head is poor.

We thought the OEM lambda probe was faulty or defective as we could not believe the logs so we ran an independant Lambda probe

20161112_174952 by Fat Bear Photography, on Flickr

20161112_175001 by Fat Bear Photography, on Flickr

IMG-20161112-WA0008 by Fat Bear Photography, on Flickr

Turns out the oem lambda was within range and not telling us lies. We are 100% out of air.



On this particular tune due to excess fuel we were seeing a peak of 2.7bar despite request 2.4

After testing we put v24 tune back on as this tune is not safe for daily use.