GR Yaris Rötheli Racing GR Yaris

Michael Knight said:
In JPN they used titanium for chassis bolts to loose weight - was the Tsukuba record car close to 1150kg
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I saw that video aswell and they supposedly have +600nm from the stock turbo aswell... I learned to take numbers from Japan with a small bit of scepticism. Even if the Titanium bolt weight next to nothing its not possible that all the original nuts and bolt weights 50kg?

I have lighter suspension parts, exhaust, rims and so on and I'm down to 1250 with a close to full tank...

My guess is that a fully stripped Yaris can get to sub 1200kg but thats about it. Maybe if you made a entirely new loom, superlight seats and relly ditched everything you are down to 1180-1160.
 
DrSetup said:
Maybe if you made a entirely new loom, superlight seats and relly ditched everything you are down to 1180-1160.
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I think the real weight of that JP car with all fuel (not half as quoted) is about 1170kg, so that is, kinda, realistic.

And I can say that bolts are relatively heavy, there are a lot of them, quite large and solid steel - in weight reduction every little bit counts.
 
Yeah, someone posted a jokey thread about saving weight with titanium studs, but they were something like 25g less each than the steel originals.

That’s 0.5kg of unsprung weight saved. Not bad.
 
Onehp said:
I think the real weight of that JP car with all fuel (not half as quoted) is about 1170kg, so that is, kinda, realistic.

And I can say that bolts are relatively heavy, there are a lot of them, quite large and solid steel - in weight reduction every little bit counts.
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When we build a track car we fit the bolts, mark the absolute minimum length and get cutting. It is easy to save 5kg or more overall. Surprised us too.
 
Duke said:
Yeah, someone posted a jokey thread about saving weight with titanium studs, but they were something like 25g less each than the steel originals.

That’s 0.5kg of unsprung weight saved. Not bad.
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Kilo here and kilo there adds up but not an easy task. But its rather satisfying process nevertheless
 
We reached 509.9 with 1.8 bar boost on ethanol. Still stock shortblock, stock valves. We did use the kelford cams and springs. The rest is mostly custom.
And regarding weight of the vehicle, last we measured we were 1190 with roll cage, original battery, roof lining, carpet etc and original brakes. Battery is now replace with a lite blox and the brakes are still on order (hefty delay). We assume we’ll end up around 1150.
I also wonder why you are going sequential. I stuck with the ppg dogbox as i’d like the manual driving experience:)

P.s. we used a g25-550 and not (yet) a g25-660. The photo text has the wrong turbo mentioned.

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Ishk1 said:
We reached 509.9 with 1.8 bar boost on ethanol. Still stock shortblock, stock valves. We did use the kelford cams and springs. The rest is mostly custom.
And regarding weight of the vehicle, last we measured we were 1190 with roll cage, original battery, roof lining, carpet etc and original brakes. Battery is now replace with a lite blox and the brakes are still on order (hefty delay). We assume we’ll end up around 1150.
I also wonder why you are going sequential. I stuck with the ppg dogbox as i’d like the manual driving experience:)

P.s. we used a g25-550 and not (yet) a g25-660. The photo text has the wrong turbo mentioned.
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Because it‘s faster and makes racing a lot easier.

I‘m not the fastest driver on the planet, so everything that will make racing fast easier for me will help me to improve my laptimes even more.
 
Phil1291 said:
Is there ever enough? 🤣😂
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Depends on what you want. I went down this route with my S2000, but initially sat back & watched others break things. After lots of people had gone 500 & then 600 bhp & broke diffs, gearboxes & even engines along the way, I had a good idea where a happy medium was. 450 bhp in a car that is a very similar weight to the GR is plenty for road & track use. I appreciate that you are doing time attack, etc. so you want absolute balls out. Fantastic what you are doing with the GR & I love watching your videos 👍
 
Phil1291 said:
Is there ever enough? 🤣😂
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A mate with a genF GTS manual (lsa) started simply but got sucked in with the power. Ended up at around 1000 wheel horsepower. It was tricky in the wet after stage 2, became scary in the dry. Even he decided he had gone a wee bit far. Drove another mate's new GT2RS. His GT3RS was the best thing I have ever driven. The GT2 was no. Too much torque, like a switch on the road, car then wham smoke machine. Fabulous on the track he said, bit much on the road. He is a very good steerer.
 
Duke said:
500 ps not enough?! 🤔 😂
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Seriously.
Our goal is 500-600hp.

But if i build an engine with that much power, it has to be reliable.
Or at least as reliable as possible.

And therefore we‘re gonna change rods, pistons, headstuds, injectors and some other small parts.
Just to be as safe as possible.
 
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