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nismoman

Project S13 - Supersprint/Time Attack

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So the 2016 Australian Supersprint Championships at Winton have been run and won. Congrats to Duncan Forrest in his Stohr WF1.

The event attracted 138 entrants, and there were some fast lap times recorded over the 2 days. In fact the top 3 outright competitors set unofficial lap records!

I managed to be first in class, but there was only one other car to beat, so it sounds better than it really is.

Track density was high and it was extremely difficult to get a clear lap without traffic.

My best lap time recorded on natsoft was 1:31.2. This was good enough for me to qualify into the top ten outright and take part in the top ten shootout on Sunday afternoon.

 

With clear track and good opportunity I laid down my fastest lap of the weekend with a 1:30.3. Unfortunately the times from this session aren't included in the final results.

Great track and top weekend! I enjoyed learning the circuit and giving it a red hot go.

 

Pic below. more to be added soon.

Vid:

160424 s13 winton 130.3.jpg

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Went out to SMSP GP circuit on Sunday 15/5/16 for round 2 of the NSW Supersprint Champs and recorded a new PB of 1:41.6. Was 8th overall fastest time, 3rd in class.

2 cars in my class who beat me, 1 Porsche GT3 Cup Car, 1 Porsche GT3 RSR. Some guys are keen to splash cash on expensive cars to win a supersprint nowadays.

There was even a GT3 spec Lambo Gallardo there!

 

 

Set my fastest lap on the last lap of the day, good to go home on a high. I think I can get down to 1:40's with a bit more practice. But I think I have few issues and might be out of action for few months now.

 

Anyway, some pics of the epic cars and my S13.

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Top effort, it's amazing how much some people spend and an old silvia still keeps up with them.

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nice work, just goes to show the little s13 with the right mods can still hang in there with much more expensive cars

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Thanks guys, I think it's impressive too, Silvia's rock!!!

In one session, I couldn't help but smile when I caught up to a black GT2 and a red GT3. They held me up for a lap as I didn't have enough hp to take them on the straights.

I'd say it would have been too embarrassing for them to allow a silvia past them!

 

Link to Natsoft results are below:

 

http://racing.natsof...83.85Y/Result?1

 

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Nice work on the pb. 39's will come. Sucks about hg though.

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Great effort Mark! Always doing more with less!

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Not much activity on this website anymore. Seems facebook and social media is more favoured! I'm old school and still love the old forums :)

I normally don't like providing any updates without photo's (remember pics or ban?), but I have some important updates happening at the moment.

 

This morning I dropped the Silvia into Denstoj Auto Centre for some work to be done. Since the E85 conversion it has been difficult to start. Dennis at Denstoj (legend) has already found some issues with low fuel pressure and the fuel pump wiring. Also will be getting a Tomei metal head gasket and ARP head studs fitted.

Want to make sure it can run at least 22psi (maybe more) all day long.

 

Then it will be off to Premier Exhaust to replace the side pipe exhaust with a new tucked-up high, full length exhaust. This will give me room to make a flat floor and install a rear diffuser.

 

Can't wait - exciting times. Will post pics once progress is made.

 

I can't wait for it to be all done!!!! :P

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Mine was pretty hard to start after converting too, especially at temperatures below zero!

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just started checking in on this forum last few days. Glad to see some cool cars are still kicking around with threads being updated. Good stuff!

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Tomei head gasket and ARP head studs are now installed.

 

Next stop - Exhaust!!!

s13 hg nov2016.jpg

s13 hg2 nov2016.jpg

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Caught up now, don't worry I'm still here. Have just been spending all my time/money over at SAU :D

 

Silvia work has kicked off again.

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Exhaust completed, much more clearance now.

 

The car is a little quieter and sounds better, not so much like a tractor anymore lol.

 

I didn’t go too fancy as I didn’t change the dump and front pipe. Turns out these parts aren’t 3 inch anyhow, apparently only 2.75 inch. I’d only change these if I went bigger turbo with external gate etc.

 

So no v-bands, just bolted it up to the existing flange off the front pipe.

The most angle in the system is 20 degrees and it’s all at the back to keep it up high.

 

Time to start messing about with under car aero now. Can't wait!! YEOWW!!!

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I'll talk to my sponsor, Bunnings, about some sweet aero parts for you ;)

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Oh man you have a Bunnings sponsorship??? So jealous! I have to pay out of pocket at Bunnings for all of my aero and general raw materials.

 

I scored some old signs at work from a defunct distributor. I'm going to use them for my flat floor. They are made of that alucobond stuff. Nothing beats free stuff.

 

I need to take the Silvia off the trailer and get set up. Then I can take some photo's and post them up.

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Very keen to see how you go with the Alucobond, it was too expensive for my first effort prototype.

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Messing around with under car aero.

Teaser pic. Diffuser test fitted.

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Progress is slow, but I have added more brackets. Settled on position and I fabricated a side mounting plate also.

It should look mad once all painted and fitted up.

s13 diffuser.JPG

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Revised splitter, flat floor and rear diffuser all finished.

Tested it as SMSP GP circuit at NSW Supersprint with encouraging results.

I need to strengthen the mounts. So much downforce! Didn't expect it to work so good!

171015 smsp gp s13 1.41.9.jpg

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Nice. Got any pics from underneath?

What did you make the false floor with?

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G'day - Happy New Year All!

2018 is going to be sweet!

 

I took some pictures (attached), but it's very difficult to see all my hard work lol. I used rivnuts inserted into the chassis rails and then used bolts/washers to attach sheets of alucobond (aluminium and acrylic composite) to the underside. It's about 5mm thick. Pretty light and rigid. It runs from the front cross member to the rear diff. It is as wide as the chassis rails. (due to sheet size I got for free). Used t-piece extrusion bits to join the sheets.

 

Then my plywood front splitter joins the flat floor at the cross member. FRP diffuser joins at the rear diff. Had to cut out some bits to clear the exhaust in some sections, also helps with managing heat.

 

I wasn't expecting much difference on track as this was all untested and pretty slap together. I had some expectation my aero mods could have a negative result with the extra weight and possible extra drag. With no CFD or wind tunnel or even scale model tests, what could I expect?

As it turns out, the rear diffuser broke it's mounts from all of the load and downforce it generated. The positive outcome was I then removed the damaged diffuser and ran again without it.

Felt the lack of rear downforce immediately through turn 1 at approx. 180km/hr!!! The rear end stepped sideways on turn in. Talk about exciting way to enter turn 1!!!

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diffuser attached.JPG

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Happy new year mate. Well that is a scary way to figure out pilot mod 1 was a success. Looking forward to seeing how you go in 2018 buddy

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Hey! Nice to hear from you too! Much happening in your world?

 

I'm hoping to do at least 6 supersprints this year.

Bought a new race seat and 6 point harness.

 

Hey! Nice to hear from you too! Much happening in your world?

 

I'm hoping to do at least 6 supersprints this year.

Bought a new race seat and 6 point harness.

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Nice. Looks good. Glad to see it made a difference. Would be interesting to see if it makes much difference to gearbox and diff temps.

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Thanks! I have to remake the diffuser and make the tunnel a little wider. I need to beef up the mounts and just make it overall stronger.

I too am a little concerned with temps, but luckily the car is only on track 10mins at a time.

If I ever did proper racing with 10-20 laps, it would need a rethink.

 

You have some more races planned for 2018?

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Yeah, I'm not sure how many meetings I'll be able to do this year. Hoping to do a couple of rounds at Lakeside and hopefully get to Morgan Park. I won our class championship last year so just planning on doing the rounds I actually like and avoiding Queensland Raceway.

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love your attitude and making do with free materials mate. Nice car too btw

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Thanks to those still following! Appreciate all the feedback and comments.

Round 1 - NSW Supersprint Championship 3/3/18 -   Finished 13th outright, and 2nd in class. Damn pesky EVO beat me! Very hot day - Lap time was down 2 secs off my PB. Still 1:43 not too bad.

New aero worked well, still need to fine tune it and need to explore the limits with more seat time. The car ran flawlessly with only needing to adjust the tyre pressures and keep adding fuel for the day.

Some pics from Saturday-

180303 m.smith smsp.bmp

180303 a.smith smsp.bmp

 

 

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