Punknoodle's ST185

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Re: Punknoodle's ST185

Postby FC Zach » Tue Nov 06, 2018 6:20 am

Punknoodle wrote:I'm sure I will end up selling it but I'll keep it for a while as a spare.


Out of curiosity, is there that much more difference between a ceramic wheeled CT26 (which I have) and a CT20B? Or is a 20B better matched to a modified 26 (CT27)? . . or even better than the CT27?

From what I've read the ceramic wheeled 26 spools faster than the standard 26 but I don't know how it compares to the 20B. The figures for a 27 by ATS show 300rwhp so I wonder how it compares to that as well. .

Either way, none of that really matters at this point since I have a monstrous front mount (installed by previous owner that I never got around to replacing, but it looks nice though) that is better suited for a high horsepower app. so any turbo I'm looking at is gonna have to work for a few to build pressure until I get a better size for my set-up.
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1992 Toyota Celica AllTrac
1993 Yamaha GTS1000
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Re: Punknoodle's ST185

Postby Punknoodle » Tue Nov 06, 2018 6:56 am

FC Zach wrote:Out of curiosity, is there that much more difference between a ceramic wheeled CT26 (which I have) and a CT20B? Or is a 20B better matched to a modified 26 (CT27)? . . or even better than the CT27?

From what I've read the ceramic wheeled 26 spools faster than the standard 26 but I don't know how it compares to the 20B. The figures for a 27 by ATS show 300rwhp so I wonder how it compares to that as well. .

Either way, none of that really matters at this point since I have a monstrous front mount (installed by previous owner that I never got around to replacing, but it looks nice though) that is better suited for a high horsepower app. so any turbo I'm looking at is gonna have to work for a few to build pressure until I get a better size for my set-up.


Not too sure regarding the different turbos. I was originally running a CT26 then switched to the CT20B (ceramic wheel). I did a heap of other upgrades at the same time including ECU so hard to say how much better it is by itself but it makes good power right to the redline where the CT26 fell over. Spool is excellent as you'd expect.

I limited myself to 19psi though with the CT20B due to the ceramic wheel.
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Re: Punknoodle's ST185

Postby Punknoodle » Wed Dec 05, 2018 11:30 am

So, I had a reasonably good day out at Morgan Park last month - the car had a couple of issues which I sorted, but it still put a bit of a dampener on things. On the plus side, the circuit is absolutely mega, I loved it and can't wait to go back there. I also got a few great photos from a photographer, which I'll post at the bottom of this post.

One of the issues I had on the day was the banjo bolt for the wastegate actuator came out. This caused the car to overboost, which the ECU controlled by cutting fuel, but it's definitely not a good thing. The idle also went quite lean and WOT is a little leaner than before. I decided that I'd just bite the bullet and proceed with the fitment of the Precision turbo. While I'm at it, I'm going over everything making sure it's ok, injectors have come out and are getting cleaned and tested, new fuel filter going on etc.

I disassembled the external wastegate then took the wastegate housing, manifold, dump pipe and wastegate pipe to Competition Coatings to get black ceramic coated, as they were plain stainless before. I need to try to control under bonnet temperatures as much as possible.

I've also sorted out all the plumbing I need for oil lines, wastegate lines etc. I'm going to use Speedflow braided teflon with AN fittings for the lot, from turbo to boost solenoid to wastegate. I don't want there to be a problem with a wastegate line again, so I think it's worth it. I'm also making my own oil return flange for the sump with a AN-10 weld on fitting to keep everything nice and tidy.

I've removed the old turbo and done some tidying in the bay. It's nice to be able to lose the big coolant hard line, the big oil line and drain for the turbo, the large turbo bracket and the big heavy cast manifold etc. I've also remounted the boost solenoid closer to the turbo. Once the new turbo goes in, everything is V-Band and the new lines are all flexible braid so it should look a lot tider.

So yes, shouldn't be too long now till the turbo is in and I can match up the exhaust and intercooler plumbing.

Finally, shots of Morgan Park as promised:
ImageSkid Control Track Day by Nick Winsor, on Flickr
ImageSkid Control Track Day by Nick Winsor, on Flickr
ImageSkid Control Track Day by Nick Winsor, on Flickr
ImageSkid Control Track Day by Nick Winsor, on Flickr
ImageSkid Control Track Day by Nick Winsor, on Flickr
ImageSkid Control Track Day by Nick Winsor, on Flickr
ImageSkid Control Track Day by Nick Winsor, on Flickr
ImageSkid Control Track Day by Nick Winsor, on Flickr
ImageSkid Control Track Day by Nick Winsor, on Flickr
ImageSkid Control Track Day by Nick Winsor, on Flickr
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Re: Punknoodle's ST185

Postby Punknoodle » Thu Jan 03, 2019 8:43 pm

New turbo is installed and everything in the engine bay is complete, ready for tuning.

Changes are:
- Custom V Band manifold
- Turbosmart Hyper45 External Wastegate
- Precision 5858CEA Ball Bearing Turbo
- Custom dump
- New SPAL radiator fan
- Mishimoto non thermostat oil sandwich plate
- Speedflow braided teflon lines for wastegate plumbing and oil feed/drain

Looking forward to getting it tuned and seeing how it drives on track!

Image

Image
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Re: Punknoodle's ST185

Postby Corey » Fri Jan 04, 2019 2:00 am

Looks fantastic! Beautiful car.
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Re: Punknoodle's ST185

Postby Punknoodle » Fri Jan 04, 2019 7:14 am

Corey wrote:Looks fantastic! Beautiful car.

Thanks mate!
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Re: Punknoodle's ST185

Postby Punknoodle » Thu Mar 28, 2019 12:14 pm

Well two events down for the year so I thought I'd do another update here. Tuning went well - I was quite surprised with the boost response. I was expecting to take a little bit of a hit in terms of response due to the larger size of the PTE5858, but due to the appropriate sizing of the exhaust housing, great manifold design, no restrictions in the exhaust, modern ball bearing turbo design and great tuning, the response is pretty much exactly the same as the old CT20B turbo. It makes 550Nm of torque and it holds strong. Peak power on low boost is around 200awkw, and on high boost is around 235awkw. I could have pushed harder as there was more room in the fueling, but I wanted to try and keep as reliable as possible. The engine could also take more timing now as the turbo is running more efficient than the old unit, so that helps with spool.

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Lining up at pit exit for Round 1 of QLD Time Attack QR Series

I've had two events so far, one at Queensland Raceway and one at Lakeside. Car has performed fairly well so far, temps are good. I thought I had an engine knocking issue but it just turned out to be a broken bracket on the exhaust which was making a noise. I've since found an issue where high boost wasn't actually high boost, it was actually marginally higher than low boost. It was a simple issue with the trim input wiring - it needed a pull up resistor - so high boost was actually still setting about 50% boost trim. This is now fixed, so looking forward to getting back out and trying high boost.

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Big smile in behind my helmet, trust me!

I ended up 2nd in class at QR, 0.5s off doing a "Holy Grail" laptime (which earns you a cool sticker to put on the car because it's a great achievement) on low boost. Keen to see how it goes on high boost. It was a pretty hot day too, grip was fairly low. At Lakeside I was a little off the pace - I managed to better the laptime I set there last year, but grip was very low and the car just didn't feel hooked up. Still, it was a good day, Lakeside is such a good track, every lap is a thrill.

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GT4 vs GT-Four in the same shot, I love this shot!

Coming up in a little over a week is the Japanese Nationals Time Attack event, out at QR. Super keen to get out there with full boost, but also looking forward to playing with my new toy... I couldn't help myself and bought myself a Motec C125 Race Logger. This unit does full on board data logging, GPS, G-Force sensors, colour display etc.

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View from my on board camera of the new dash

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A sample of the data collected by the dash, in Motec i2 Data Analysis software

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I added my own personal touch for the welcome screen :D

Below are some more pictures from the year. As always, for more detail, on board videos etc, check out my facebook page "Duke's Racecar Engineering" or my instagram, @thedukeofwinsor

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On Board Lap of Clubman
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Re: Punknoodle's ST185

Postby Punknoodle » Sun Apr 07, 2019 11:32 am

Unfortunately Japanese Nationals didn't go to plan today. First turn of the flying first lap of the first session and I stuffed it up. Went in way too hot for the cold tires, lost it and put it deep in to the gravel trap.

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Felt like a real rookie sitting in the gravel waiting to get towed out. I'd been looking forward to this event for a while and for it to finish so early was heartbreaking.

I ended up peeling 2 tires off the beads while going sideways in the gravel, very lucky it didn't roll. Got towed out, got all 4 tired unmounted and remounted, but one was damaged so I was unable to continue. I emptied all of the gravel out of the car and loaded it back on to the trailer. Once I got it home, I cleaned it and put it up on stands to assess the damage.

It still runs and drives straight, I don't think I've done any mechanical damage but I'm yet to go crawling under the car. Cosmetically though, the left side of the car has a lot of scuffing at low level from the gravel. The wheels all look really scratched up and I cracked my wing mirror glass from the stones pelting it. The good thing is though that the splitter held on nice and strong even filled up with all that gravel. It shows that I've built it strong enough.

I also need to replace all 4 tires. I was thinking that this event was going to be the last event for this set as at the last event they felt average. Looking at them now, they feel pretty hard. Apparently these AR1s are fairly limited for heat cycles and I think they've had it. Goes a long way to explaining why the grip was so poor, especially because they were cold. It was still totally my fault - I shouldn't have gone in so hot until I'd experimented with the grip of the car.

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It's not quite the data I was hoping to get from the weekend, however it was quite interesting to look at my spin. It shows an approach of 190kph, on the brakes, then rolled in to the turn at around 160kph. I got sideways at around 150kph, tried to catch it by loading on some opposite lock and giving it some throttle as you can see from the data. At this point I was at around 1.2 lateral Gs. The rear kept on coming around though, and at this point I was out of lock without switching my hands on the wheel. I've never done this before but I did it out of desperation. The car gripped but by then the wheels were pointing the wrong way and it flicked me the wrong way. I spun, went in to the gravel backwards at around 125kph and around 2 lateral Gs. I then spun a further 180 degrees and stopped about 2m from the concrete barrier.

Looking back, I maybe should have held the wheel in my normal grip and held the lock I had. I'm confident I was coming off anyway, it was coming around too quick and there was no grip, but it may have had a better outcome. In saying that, it could have bit the gravel even more sideways than it did and rolled, so who knows. It's easy to look back in critique your reaction after the fact, but in the car, feeling what you are and having a very short amount of time to react, it's a little different.

At the end of the day, it's lesson learnt and a good result that I didn't roll or hit the fence. Looking forward to getting back out there again once I replace the tires and give the car a good check over.

Anyway, here's the in car footage. At least the new Motec C125 dash looks on point!
https://youtu.be/teY9Ng61dP8
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Re: Punknoodle's ST185

Postby CMS-GT4 » Sun Apr 07, 2019 2:10 pm

You've got the right attitude. Put it all back together, and try again. It sucks to have to deal with the damage, and scuffing a beautiful car, but in the end its living its life to the fullest and its going to get experience marks along the way.
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Re: Punknoodle's ST185

Postby Punknoodle » Sun Apr 07, 2019 9:17 pm

Thanks mate, yeah 100%. It's very rare to see a racecar without any battle scars on it, at the end of the day if you are going to be pushing at the limit, which you need to do to make it worthwhile, these things are going to happen. All part of the sport we love :)
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