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 Post subject: Re: Our little cultus racer
PostPosted: Mon Dec 03, 2018 6:09 pm 
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Joined: Mon Dec 19, 2016 10:40 am
Posts: 664
Location: NZ
share away GTP...thats what its all about....damn nice looking setup you have there. ill get back to you with the figures....at this stage it looks like 5kg. yup spindles are different but the hubs are gti. only different bearings required....

ill have to adjust my centre spacers....but i should be able to ditch the wheel spacers all together.


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 Post subject: Re: Our little cultus racer
PostPosted: Thu Dec 06, 2018 7:43 pm 
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Joined: Mon Dec 19, 2016 10:40 am
Posts: 664
Location: NZ
testing car this weekend....all going well Ill drive it in the first round of the summer series on Sunday. go pro ready.....hope it goes well.....


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 Post subject: Re: Our little cultus racer
PostPosted: Fri Dec 07, 2018 7:23 pm 
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Joined: Mon Oct 12, 2015 11:30 am
Posts: 286
Location: Napier
Looking swanky! All the best Glen, hope it does what you expect of it.

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A Kiwi learning to fly in a Mk1.


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 Post subject: Re: Our little cultus racer
PostPosted: Sat Dec 08, 2018 7:29 am 
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Joined: Mon Aug 25, 2003 12:00 am
Posts: 1571
Location: Londoninium
car looks the biz, now does it go like the biz?
GTP


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 Post subject: Re: Our little cultus racer
PostPosted: Sat Dec 08, 2018 9:35 am 
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Joined: Tue Feb 23, 2016 5:38 am
Posts: 354
Location: Amberley
The wheels certainly look the part. They'll be lighter and safer with no spacers but more importantly they're a better colour.


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 Post subject: Re: Our little cultus racer
PostPosted: Sat Dec 08, 2018 3:03 pm 
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Joined: Mon Dec 19, 2016 10:40 am
Posts: 664
Location: NZ
haha sam...I knew someone would mention the colour! =D>

Hey Im really happy....its not the 1:23 as yet but there is driving skills to improve...some bugs to work out....and slicks if needed....the result is a 1:25:140....certainly within range of slicks....or better driving....lol.... 8-[ I only got 20 laps in...so there is plenty of scope for improving my s**t driving...but hey...HAD A BLAST!
and the gear stick arrangement worked really well!

for your viewing pleasure....https://youtu.be/vpRw5Sple6k

I had an awesome day...compete tomorrow for the first time....


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 Post subject: Re: Our little cultus racer
PostPosted: Sat Dec 08, 2018 3:44 pm 
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Joined: Tue Feb 23, 2016 5:38 am
Posts: 354
Location: Amberley
So what rubber were you running on for the test? You should download something like TrackAddict and sync your GoPro with the app to overlay some basic logging.


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 Post subject: Re: Our little cultus racer
PostPosted: Sat Dec 08, 2018 6:02 pm 
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Joined: Mon Dec 19, 2016 10:40 am
Posts: 664
Location: NZ
toyo R888R semi slicks....put slicks on and it would stick better!


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 Post subject: Re: Our little cultus racer
PostPosted: Sat Dec 08, 2018 6:48 pm 
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Joined: Tue Feb 23, 2016 5:38 am
Posts: 354
Location: Amberley
I guess it will. Haven't tried Toyo's, I'm using DZ03G's and A050's but prefer the Dunlops. Slicks aren't normally allowed so not something I can consider.


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 Post subject: Re: Our little cultus racer
PostPosted: Sun Dec 09, 2018 8:29 am 
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Joined: Sat Apr 30, 2005 9:27 pm
Posts: 857
Location: Brisbane
Great In car
So good that you is get to enjoy all the hours of workshop work on the track


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 Post subject: Re: Our little cultus racer
PostPosted: Sun Dec 09, 2018 4:51 pm 
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Joined: Mon Dec 19, 2016 10:40 am
Posts: 664
Location: NZ
well Guys the results are in....mixed bag but overall im ecstatic with the results.

the bad....overheating in traffic. that radiator is too small.....going to cut the left light socket down and go for a larger radiator. plus duct to it.
the oil is being pumped into the catch can leaving the sump half empty meaning the remaining oil is overheating causing a loss of oil pressure....down to 55 psi when normally around 65 to 70. it has not done this before....the engine does not seem to be breathing heavily but i have read these are prone to it....CHIME IN GUYS! im thinking of two return lines from the rocker cover to the sump. I have sent the logs to the tuner...hopefully no damage done.....he set up protections and i reached those today...it was a HOT day. the car has never produced this much power so in traffic....(first time) its struggling. hopefully his protections were adequate....twice i hit a reduced rev limit of 6000 rpm...only momentarily...moved out of draft and bingo....got full revs.
personally i think the rings have bedded and im in a high compression situation....the car is performing well. I have talked to MANY guys today with oil in the rocker cover issues! hey Blake...we have had that convo! 8-[
still over reving on the upshift.
blip not enough as yet i think. not operating all the time.

the good.
The project started with a goal of 1:24:00 and no lower. that goal moved to 1:23:00 when the goal posts moved within Manawatu car club. First round today (not in video) 1:23:861
god damn!...on semi slicks too! It just kept getting quicker too. no slicks for this baby.
many comments on the "angry mouse" motorbike sounding suzuki and many folks asking what in the hell it was and how well it was going.

I had an awesome day. forgive any s**t driving....Thats a work in progress. turn up the volume and enjoy "MIGHTY MOUSE"
https://youtu.be/KHhpfwuxL1M


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 Post subject: Re: Our little cultus racer
PostPosted: Sun Dec 09, 2018 6:09 pm 
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Joined: Mon Oct 12, 2015 11:30 am
Posts: 286
Location: Napier
Glad you got out there and had a blast! Those first few laps with all the traffic look hectic, hard to get a good line in to get sorted out.

My amateur observation: cooling - airflow to the radiator area looks poor, it might be an idea to try putting some mesh in the left headlight and making an air funnel to the radiator before going to a bigger one. The bumper does not allow much air through the engine bay by the looks, so in traffic this would be worse. I would also put in a lower temp thermostat or remove it completely if not already done. (someone feel free to school me if removing the thermostat is a bad idea for a race car)

Perhaps an extra return line from rocker to mid block/above oil level? Air pressure would not have to fight oil in sump to get out so pressure would equalize faster. (not a pro so school away!)
Blocked PCV valve?
Catch can is drained back to sump and vented? Pros and cons here.

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 Post subject: Re: Our little cultus racer
PostPosted: Sun Dec 09, 2018 7:18 pm 
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Joined: Mon Dec 19, 2016 10:40 am
Posts: 664
Location: NZ
Hi Michael.

yes someone mentioned the flow to the radiator.
catch can vented....but not directed back to the sump....just to the floor of the shed...about a litre. 8-[
maybe no thermostat for the summer but def in winter....however once its opened.....its open...so will still heat up.

whats a PCV valve? don't have one

about the lines....yes was hectic....i just tried to steer the car where no one else was on the track.....racecraft 0....luck...maximum. I was not worried about position as what i have seen from karting is mostly all the crap happens on the first lap at the first turn...so i just try to get through it without carnage.....on the first race i steered around carnage.....!!!

Ill go from rocker to sump as its easier....mid block has no oil ports??
plus ill take the catch can oil back to the sump...maybe ill just try that first......and ducting to the radiator...plus ducting out??


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 Post subject: Re: Our little cultus racer
PostPosted: Sun Dec 09, 2018 9:40 pm 
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Joined: Sat Apr 30, 2005 9:27 pm
Posts: 857
Location: Brisbane
I had the same issue with oil surge filling the catch can at Queensland Raceway on turn 1 Constant sweeping corner at 8500rpm in 3rd
You should send a pm to DMW Dave He has all the modifications you require on his GTi race car
Great incar during the race I bet the guys in the MX5s were surprised


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 Post subject: Re: Our little cultus racer
PostPosted: Mon Dec 10, 2018 2:53 am 
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Joined: Mon Dec 19, 2016 10:40 am
Posts: 664
Location: NZ
Thanks jasSTv....I will.

Yes it gets rid of oil quickly....I don’t know why all of a sudden? Perhaps I’m getting confident and causing the same thing to happen. Hey what turn did it happen to you....left or right? I think the loss of oil causes the remaining oil to overheat. It’s very easy to see the engine temp and oil temp are very closely related on this little motor. It was especially bad in traffic....perfectly solvable I think.

Normally the mx5 boys are not in our group and the taxi,s....(holdens) the escort and a white Honda drive down to our groups time because they can’t win the next group up. The holdens barge their way around the track hence the frantic....”piss off and pass me now signal” I gave to one of them. He’s a 1:21 car. Our min time is a 1:23.
They put us together because the summer series is smaller as a lot of people go on holiday. So 31 in our field. In my first race I asked for the back of the grid. Went front 31 to 13 in first race ever in the car. Wish I had that on the go pro. Had some interesting moments....an mx5 snarl up in front of me and drove through the debris as cars speared off the track right in front and a gap that opened up in front of me I could sneak the little car through wing mirror to wing mirror and passed about 5 cars in one go! Had a blast!


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 Post subject: Re: Our little cultus racer
PostPosted: Mon Dec 10, 2018 3:36 am 
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Joined: Mon Dec 19, 2016 10:40 am
Posts: 664
Location: NZ
Christ I have been reading this morning. For this problem to suddenly surface....and for it to fill the catch can quickly....I wonder if I have broken a ring.
I’ll do a compression check today. :roll:


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 Post subject: Re: Our little cultus racer
PostPosted: Mon Dec 10, 2018 11:45 am 
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Joined: Mon Dec 19, 2016 10:40 am
Posts: 664
Location: NZ
the saga continues....250,250,250....125. FCUK. :cry:


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 Post subject: Re: Our little cultus racer
PostPosted: Mon Dec 10, 2018 2:03 pm 
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Joined: Wed Feb 22, 2006 5:19 pm
Posts: 2059
Location: Outback Tassie
Oh no! #-o Gutted for you! Hopefully you can turn it around quickly and make use of all the improvements!

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Back in the game! Now building something mental... Will I ever finish? I hope so! When? No idea.


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 Post subject: Re: Our little cultus racer
PostPosted: Mon Dec 10, 2018 5:34 pm 
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Joined: Mon Dec 19, 2016 10:40 am
Posts: 664
Location: NZ
it aint going to be quick. results are in. No 4 piston ring lands cracked in five places.


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 Post subject: Re: Our little cultus racer
PostPosted: Mon Dec 10, 2018 7:09 pm 
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Joined: Mon Dec 19, 2016 10:40 am
Posts: 664
Location: NZ
we think detonation has taken out no 4. Now id be worried the other pistons will soon follow...so all must be changed..it looks like it ran lean on no 4. not the tuners fault...ill say that right here....he cant do the AFR on each cylinder...it could be an injector fault but here is my take on it.

1.The ECU reported 46 degrees in car.
2. The day before the car ran faultlessly with no heating issues. Lower temp day
3. Race day there was much traffic and dirty air
4. I drove it harder race day....1:25 practice day versus 1:23 race day lap times and race day was much hotter
5. Underdriven water pump...no. 4 furthest from cool water
6. 98 octane fuel
7. possible injector fault
8. radiator maybe too small for racing with that power especially in traffic....and maybe needs to be ducted.

cylinder obviously lean compared to others. Bore and piston looks ok...except for cracks in lands....rings are not cracked. 8-[

fix???
pistons...replace....get injectors checked....check for sealing....vaccum test all cylinders when its back together...run av gas....(i see you :roll: your eyes at me sam) back away from the knock threshold a little more....install a bigger radiator....tighten up the ECU protections....run a Lambda sensor for monitoring purposes only....even though it can only detect the exhaust gases as a whole it will detect a leaning of a cylinder to give hints. Install a fuel pressure sensor. install an oil pressure sensor. ....put an 82 degree thermostat in it....run a return line to the sump from the catch can.

Ill do the BMW m50 head studs and I've got a new APV van MLS gasket coming...that did not let me down.

Nothing throwing more money at it won't fix....something I never really wanted to do again on the engine for now....but we will rebuild....its just too awesome not to.

perhaps you can learn if you haven't already from me being a crash test dummy. 8-[


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