Roman Posted December 31, 2022 Author Share Posted December 31, 2022 Its more about hoping not to induce knock with the high compression / keeping a better safety margin and where I know its safe. So my ignition and fuel adjustments are very aggressively keeping things on the safe side if it gets hot. The motor got a lot louder and felt a bit flatter at end of the straights. Also since there's no oil cooler its more like the oil put heat into the block, then the coolant cools the block. So in a round about way keeping coolant lower keeps oil lower too. So far its been good at keeping the radiator temp to a decent level. 5 Quote Link to comment Share on other sites More sharing options...
Popular Post Roman Posted December 31, 2022 Author Popular Post Share Posted December 31, 2022 Got this all printed but as expected it's a bit silly. I dont want to drive the car with no bonnet, and I cant cut my spare one as this covers the bonnet latch. But physically seeing something there gives some inspiration anyway for how things might work. I think I'll switch back to putting the throttles closer to the head on the shorter manifold, so I've got more room for airbox activities. In aid of trying to find an air filter that will be appropriate, I've decided to brute force the problem. Some poor hungover person at Repco Morrinsville is going to really hate my click and collect order 13 3 17 Quote Link to comment Share on other sites More sharing options...
rusty360 Posted January 1, 2023 Share Posted January 1, 2023 That's a fark load of filters! 1 Quote Link to comment Share on other sites More sharing options...
igor Posted January 1, 2023 Share Posted January 1, 2023 I guess it's to give a large range of options for testing to discover the best possible setup. 1 Quote Link to comment Share on other sites More sharing options...
ajg193 Posted January 1, 2023 Share Posted January 1, 2023 What decade are those prices from? We were at repco yesterday, I asked the guy at the counter if he had a good party the night before. He just gave a slight nod 2 3 Quote Link to comment Share on other sites More sharing options...
HighLUX Posted January 2, 2023 Share Posted January 2, 2023 A trip over the Kaimais to get some 100+ from NPD should be on your to do list Quote Link to comment Share on other sites More sharing options...
Roman Posted January 2, 2023 Author Share Posted January 2, 2023 Higher octane usually helps if you are unable to keep advancing the ignition timing, because the engine is knocking or very close to knocking. However in this case the motor made its best power on dyno without knocking at all. So there's a bit of margin on 98 octane. In which case I dont think 100 octane would help. E85 might give some tiny tiny gains from charge cooling or whatever but it's unlikely to be worth the hassle. 5 Quote Link to comment Share on other sites More sharing options...
ajg193 Posted January 9, 2023 Share Posted January 9, 2023 Just saw something on Extrude Honing AFM They squeeze a putty fully of silicone carbide particles through the runners to polish them For some reason it made me think of this project 3 Quote Link to comment Share on other sites More sharing options...
Popular Post Roman Posted January 9, 2023 Author Popular Post Share Posted January 9, 2023 "Hi, I placed a punishing click and collect order" "Aahh, the air filters?" So will try figure something out, cant make the excuse of lack of options haha. Also, although I've enjoyed having this look like a standard car, I also want to try get a sweet top speed at Pukekohe this weekend. So I've fitted the Vitz RS sideskirts that I've been hoarding, and found a standard spoiler but thought it was a bit meh. So I robbed this, partially cos the colour was close enough Will take some fuckery to make it fit securely but its pretty sweet. Also, the tiny wheels/tyres are friggen sweet. haha I have found one problem since adding in max camber at the front though. I've got the camber bolts in the top holes of the hub/strut, this means when it adds camber it's pushing the top of the hub closer in towards the center of the car. So on full lock the CVs seem to have been binding. I switched the camber bolts to the bottom holes instead, and seems to be sweet now. I'm still procrastinating on fitting the disc rear setup, see how we go... 24 3 Quote Link to comment Share on other sites More sharing options...
shrike Posted January 9, 2023 Share Posted January 9, 2023 Any idea what the drum vs disc rear end weight difference is? If not would be keen to read about it when you do it :p I'd also be keen to understand if it gives you slightly better braking performance, remind me are you getting any brake fade currently? In saying that swapping out pads each track day is surely easier then swapping drum shoes? Hopefully sideskirts make a difference, I think they look good though. Curious on how you utilise the filter options and see what you come up with. Quote Link to comment Share on other sites More sharing options...
Roman Posted January 9, 2023 Author Share Posted January 9, 2023 Weight difference for disc rear isnt too much. The main problem is it means i cant fit my skinny 13s on the back for drag day anymore. No brake fade at the moment, but i think currently the fronts have been doing all the work. To be honest it amazed me how good the braking was. But will have a bit more grip available now, so can hopefully lean on the brakes a bit harder. Im a bit nervous about changing too many things at once from last time, as it truly was amazingly good with such a simple setup. 2 Quote Link to comment Share on other sites More sharing options...
xsspeed Posted January 9, 2023 Share Posted January 9, 2023 with your top speed target in mind, has rolling diameter changed a lot from what you ran last time? Quote Link to comment Share on other sites More sharing options...
GARDRB Posted January 9, 2023 Share Posted January 9, 2023 11 hours ago, Roman said: Will take some fuckery to make it fit securely but its pretty sweet. Also, the tiny wheels/tyres are friggen sweet. haha Looking forward to seeing the 3d printed carbon wrapped MSPaint CFD optimised solution you settle on 1 1 Quote Link to comment Share on other sites More sharing options...
Popular Post Roman Posted January 10, 2023 Author Popular Post Share Posted January 10, 2023 2 hours ago, xsspeed said: with your top speed target in mind, has rolling diameter changed a lot from what you ran last time? Yes it has, the change in tyre size means it's the equivalent of going from a 4.3 final drive to a 4.6 (compared to old tyres) Hopefully the stickier tyres will give it more of a slingshot onto the straight, and the shorter gearing might help a little with acceleration perhaps. However I'm nowhere near topping out max speed. At 9000rpm in 5th it was previously 278kph max, now 261kph max. I thought I'd have to shift into 5th but redoing the calculation says it will do 206kph at 9000rpm on new tyres. i think last time I was short shifting a fair bit by the end of the straight because it was feeling sluggy with the power drop from overheating. Black line is old tyres, green line is new 15 3 Quote Link to comment Share on other sites More sharing options...
Popular Post Roman Posted January 11, 2023 Author Popular Post Share Posted January 11, 2023 While finishing brackets for the wing, it's got me thinking about whether these changes are actually likely to help at all. In terms of reducing drag (There can be peripheral benefits to stability, reducing lift, blah blah) So then the question, what's better? Reducing drag by a bit, reducing weight by a bit, or increasing horsepower by a bit? As each of these things will potentially help at a different speed range for the car. Coefficient of drag means absolutely nothing for helping you get off the line, but at what speed does it matter? And so on. From day 1 I've had the echo setup in a program called Cartest which is friggen awesome for testing out combinations etc. It's especially great for just isolating one variable to see how things change. So, I ran some accelleration tests with the coefficient of drag adjusted in .1 increments, weight in 100lb increments, and 10 horsepower increments. Both up and down from a baseline figure. Collated all the info into some graphs, cos thats what I do. I added the numbers onto the graph for the worst and best result, just to give an indication of how much of a spread there is. For reasons I wont bore you with the horsepower graph isnt apples for apples with the other two, but you get the idea So it looks like overall, adding some horsepower is the winner, then reducing weight is second place, then reducing drag really is a low priority. Because reducing drag to 0.26 would be an absolute fucking miracle of science, yet it results in less top speed than simply gaining 10hp. Reducing drag is great for fuel economy, because if you can cut 10hp worth of drag down to 9hp of drag, and the car only needs 20hp to cruise along. Then you've made a sizable percentage of difference. 12 Quote Link to comment Share on other sites More sharing options...
Sungai Sungai Posted January 11, 2023 Share Posted January 11, 2023 Damn i hope those tyres are as grippy as they are good looking. Praying for good weather saturday for you bro!! 2 1 Quote Link to comment Share on other sites More sharing options...
Popular Post Roman Posted January 11, 2023 Author Popular Post Share Posted January 11, 2023 Thanks, I've got all my fingers and toes crossed for the weather to cooperate! There are a few more events after this in coming weeks though, so wont be totally heart broken if the weather doesnt play along. As for grip. Some initial drives around the block to check for rubbing etc. Bringing half the road back with me seems to be a good indicator... 16 1 5 Quote Link to comment Share on other sites More sharing options...
flyingbrick Posted January 12, 2023 Share Posted January 12, 2023 This continues to be super inspirational. I'd been looking at streamliner bodies for the Hayabusa haha. Can't say I have seen one of those on a bike in NZ (Good reasons for it too, like being gay, but I still want it) 1 1 Quote Link to comment Share on other sites More sharing options...
BiTurbo228 Posted January 12, 2023 Share Posted January 12, 2023 Dead interesting graphs, as usual. Not that it's terribly relevant for 1/4 mile, but I wonder what the splits look like from 100 to, say, 124mph (200kph). Quote Link to comment Share on other sites More sharing options...
Popular Post Roman Posted January 14, 2023 Author Popular Post Share Posted January 14, 2023 Punishing details to follow 22 4 Quote Link to comment Share on other sites More sharing options...
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