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Everything posted by Steffen_Leitgeb-LSWGmbh

  1. Big weight saving is always heavy on the budget. Just check Lotus` spec lists for the Exige V6 410 or Evora 410 f.ex. And wheel weight reduction really works perfectly well. So first it is performance. Second is fashion.
  2. That lightweight wheels have a big effect for the speed and safety of race cars is well known - that´s why in most racing there is a reglement which limits materials and forces a minimum weight. It is not known to many that the reduction of rotational mass means basically more hp at the wheel if it comes to positive acceleration. This is what I wanted to show here: Acceleration test shootout today 🙂 Leitspeed LSL01 vs Lotus Original Forged of Lotus Evora S. delta in kg: 9,6 in favour of the LSL01 Testing result averaged over 4 test runs each: LSL01: 5,07 s Lotus Original: 5,21 s delta: 0,14 s 50 - 120 km/h same outside conditions Procedure: Lotus Evora S IPS, standard engine, Komo Tec headers, K&N filter run start in 2nd gear @2.500 full throttle, 50-120 km/h (no aero involved, starting from very low rpm just like on the dyno, staying in one single gear) 4 testing samples each to minimise driver and measuring errors but there were none in the files. See the screenshot of the data analysis graph. Measuring tool Racelogic VBOX Sport 20 Hz GPS The delta in acceleration performance will be there on every acceleration area (positive and negative) on track and road. So lightweight wheels do make a difference even on straight line performance.
  3. Hm. Honestly we have just discussed such a coloring solution to prevent potential corrosion problems in some markets with the specialist for the finish of the wheels in production. Simple solution: we would rather shoot ourselves than using such a 2 tone colouring 😉
  4. HRE is a US wheel manufacturer. The machine only. It means they must buy the forged material because they can not forge themselves. HRE is famous for cool design. No racing products. It is mainly bling bling but some designs are very lightweight too. Laptime is just one of their German dealers which normally concentrates on BMW tuning. Any HRE dealer in UK should be able to sell these wheels too. Set price of these HREs for the Exige V6 is above 8.000.- EUR incl. tax. to my knowledge. I think this is slightly out of the normal Exige V6 club, right? What do you think of my suggestion above? Are lightweight wheels interesting for the Exige V6 cars at all? If yes, what is more appreciated? Slighly less weight, same price, better looks or much less weight, better looks, but higher price than the Lotus forged original? The HRE performance can be done of course by us too - but just not at a small budget. In general I have the feeling the big performance improvement of lightweight wheels is not fully understood in the Lotus world yet because in the past there was no realistic offer for Evora and V6 Exiges but I might be wrong …
  5. Hi, after having finished the Evora wheels I am checking the Exige V6 now. (check What would you consider a good deal for forged alloys for the Exige V6 models? A) Same size (17"/18") and slightly less weight (- 3 kg per set) like Lotus factory forged but optically different and more classy looks - at the same price like Lotus factory forged as an upgrade mostly for Exiges with casted wheels or B) Same size but less weight (- 6 kg per set) and more modern racing looks - at a price of approx. 1.000 EUR more than factory forged for an upgrade for all kinds of V6 Exiges Remember lightweight wheels (rotational mass and unsprung weight) are a major improvement for any sports car. The Lotus factory wheels are really good but there is still potential left for those who are really into lightweight technology and who want to get the best out of their cars. Any thoughts on that?
  6. The first reason why I ever looked into making a wheel for the Evora was the unsatisfying surface of my Evora S forged wheels. Both sets 18/19 for winter use and 19/20 for summer were no longer acceptable after 4 years of use. For two reasons: a) by design of the wheel, it has sharp edges where the coating thickness was not okay and b) the base coating was wrong or too thin or simply missing (!) so at my 19/20 the wheel colouring simply peeled of and fell off. For the same design reasons the 19/20 of Evora S are not really "stable" on the final colouring of the DC wheel and the DC seemed to be a design afterthought here too. These wheels are really fine when getting a professional powder coating. Just after being disappointed with the wheels surface I was checking weight and found also big improvement possible. My focus was weight reduction and surface improvement over the basic Lotus wheels. The surface of DC wheels is down to the forging pressure, raw material and wheel design. Our wheels for all Evora types are designed that DC can work longer because it was not an afterthought. If you use 8.000 ton forging the material is normally so packed that a material corrosion is not so big like with casted wheels. If the clear coating material and the spoke design are alright the clear coating does not allow that salt or humidity gets underneath at the edges unless the surface is damaged by impact(s). Our surface treatments in my partners factory: - inspection and hand cleaning of the raw machined wheel to round off sharp edges - pea shooting whole wheel to make the right surface for further coloring - powder base coating - first colouring layer (optional DC treatment with slow processing speeds, in case of of the LS01 the wheel has a thicker design to have it cut off more material) - final coating This treatment is a little different to classic (forged) racing wheels which are not protected so well because they are consumables anyway. As we would be able to also do forged magnesium wheels with German TÜV license (already a prototype was corrosion tested out of curiosity and the test was passed successfully) this surface treatment looks alright to me. In general in Germany (for German cars Mercedes, BMW, Audi, Porsche) DC is a basic design for many many casted and forged wheels. There is no huge quality problem known to me at the moment even with casted wheels which are indeed not so good for DC like forged alloys. But in any case the DC wheel is not a wheel for track use and it should be driven more carefully than non DC wheels. And corrosion level after a damage is also influenced of the area driven - coastal areas with a lot of salt in humid air are always more critical than others. I would expect in UK DC is more critical than in Arizona for example. But of course I keep fingers crossed that DC customers do not run on very bad roads where stones or gravel will impact the last clear coat layer heavily 😉
  7. It made me happy that the Absolute Lotus Mag arrived today and I found they gave me a really nice upgrade of my regular advertising from first inside page to the back cover page 🙂 Nice stories in there as well …
  8. Thank you. I put a lot of thought and work into these wheels. They are high end all around and even more lightweight than any other option in 19/20" for the Evora. I hope it shows.
  9. Any DC surface depends on the material used. The higher the forging pressure the more packed the material and the better the DC machining (if the right tool and programming is used). Here it is 8,000 tons pressure, AL6061, professional DC treatment while production. After the DC spinning the wheel is covered with a thin clear coat layer so cleaning is no problem at all. Pictures attached show a LSL01 raw wheel after machining and a LSL01 wheel for sales with DC finish … The DC wheel still has a blue safety sticker on the outside to prevent scratching.
  10. I would never do a DC treatment of none DC designed wheels. But I suspect the beefy original forged Lotus wheels can be okay 😉 Upper class forged wheels which will get a DC treatment are normally milled thicker first so that they do not get "under measured" after the additional DC milling … at least this is how I have decided to have produced my Leitspeed wheels for the Evora. With that technique you can cut off slightly more material and get a nice mirrored surface and the static of the wheel is fully unchanged which is most important for lightweight wheels. Check Infos here:
  11. As I know normally all professional press cars are prepared in very detail to meet sport auto testing procedure - if they are not prepared they fail badly or are outperformed by those who do. I expect Lotus simply did not do it, or took it not really seriously or the car was even simply borrowed from a dealer who was not up to the task and hoped for good results against the other cars. All prepared press cars use special camber settings to work at the difficult Hockenheim short circuit. Lotus should invest in a special preparation for their press cars and that is all and they are set at the front if the driver can handle it. F.ex. the German press cars are selected from the factory, rebuild and adjusted for the special test of magazine or TV. If it is for speed: Tire sets may be selected or prepared even. Geo is for grip and not life time or safety. Car is made more lightweight. Engines are slightly more powerful, auto gearboxes shift quicker, brakes are bedded in perfectly and the test was run at the factories testing areas secretly beforehand to know the potential results. I have worked with German press car divisions and I know the huge efforts which are taken here. I even came across a German sports sedan once having an aluminium roof instead of a steel version which was used in serial production 😉 The car manufacturers are giving their best - including smallest cheating and as all are doing this it is really no problem. But Lotus might not be able due to cost savings? Apart of that: if the magazine´s lap time on a track is your only "currency" of sports cars to find the right performance/price relation you must rely more on a journalists information than your own feeling inside a car. I learned long ago this is like watching porn, fake boobs and all - just second hand, you are not in it yourself and this not your personal reality. And forget about objective press judgements. I am in the automotive business far too long …
  12. Evora 430 is "GT country". High performance and small quantity production. I simply guessed approx. 4.800 GBP price inc. VAT. Glad that I am not bad with such guessings. Compared to the new sales price for the car it is okay even. What is the delta to 410/400 discs? If you really want to cry go to Porsche for a serious 911 parts shopping and service or repair costs outside warranty. Don`t even think about the 911 Turbo S or PCCB brakes which are basically crap and ruinious when driving on track 😉 BMW M4 or Audi S4 steel brakes are not really cheap too and they are produced in real big quantities compared to any Evora part.
  13. I see. Good info. Is the wheel in the Lotus cup regulated somehow? Would it be possible to use a different and more lightweight racing wheel in 18" for the Evora? I understand the Evora race cars in the Cup are not fully identical with the GT4 cars. In GT4 there is a strict wheel regulation (minimum weight) and only the special wheels which have been homologated by Lotus at the FIA are allowed.
  14. Good addition. Interesting. But why did you go for 18" front and rear? Clearly the rotational mass is better as the rim is more centered. But according to magazine tests and also Michelin statements grooved tires (even Cup 2) do need a stiff wheel system (tire+wheel) for best handling and traction. That is why I never took 18/19 into consideration while development after the Michelin discussions. It is completely different with slick tires, here the whole system can use more flexibility to put more rubber on the road under dynamic pressure. Does anyone else drive BC Forged? 19/20?
  15. Yes. Exactly. Thank you. Perfect. My old car has changed really. The Evora S is now really quick and steers even better. If has one has an Evora 400 and compares a full titanium exhaust with lightweight wheels (approx same cost of 5k and approx the same reduction of 5,5 kg) the wheels are the more clever investment because the weight reduction counts several times: it is reduction of - unsprung mass -> better comfort, better tire grip, less wear - rotational mass -> better acceleration and deceleration, better cornering - total mass -> better of everything according to Chapman Wheel weight reduction is the most easy and best solution to optimise even a Lotus. Not really cheap but highly effective. The exhaust´s weight reduction f. ex. counts once into total mass and as it is also located near the center of gravity of the total car you don´t feel a real difference in handling. But even if lightweight wheels are technically sound … they still do not sound as good as a titanium exhaust! 😉 Now there is a new opportunity für Evora drivers to decide here. Why don´t take both and have a much better car afterwards?
  16. Okay. Still the Leitspeeds have a big advantage. I really thought the weight difference would have been smaller.
  17. Okay. This is really a fully credible information? No guess work involved? Then the weight reduction of the press release was compared to the casted wheels and not the forged ones. Thank you 🙂
  18. I have all the basic wheel weights - just this special 410 is missing. The 430 is not of big interest for me as it is a simple design and very cost effective on the production and therefore not ideally lightweight. Front and rear and size is 19x8 and 20x10,5 rear which makes the rear really heavy compared to standard. wheel/rim weights in kg: Evora (S) Lotus original forged 19x8 and 20x9,5 Front 10,15 measured Rear 12,1 measured Evora 400 original forged 19x8 and 20x9,5 Front 9,5 said, 9,5 measured Rear 10,5 said, 11,1 measured Evora 410 Lotus super lite forged 19x8 and 20x9,5 Front ??? Rear ??? These do not accept all Evora max loads, Lotus will sell only to certified owners of Evora 410 two seater I was told by Lotus in 2017. Our Leitspeeds are 19x8 and 20x9,5 Front 7,95 @ 380 kg max load homologated* Rear 9,5 @ 600 kg max load homologated* *German TÜV tested and homologated for use on German streets TÜV accepts the wheel for all Evora S, 400, 410 Sport, 430 GTS, 410GT max loads with downforce - except the 430 two seater in Germany only - but the wheel withstands higher loads so outside of Germany the GT 430 can use the Leitspeeds too - and there it is a huge difference in handling. The max downforce is in area wich you might reach on the German Autobahn but not on a racetrack. Not even the Nordschleife long straight. As I have all the exact weights for the Michelin different tires and TPMS valves I am happy if someone can simple measure a Evora 410 front and rear wheel.
  19. Excellent. Thank you. I am happy with the total weight: rim + TPMS + Michelin Cup2 tires. That is enaugh. Lotus only told officially to me - more lightweight than standard but they wont sell that wheel to any Evora 400 or Evora S user as the max. load is calculated for the Evora 410 2 seater only.
  20. Isn´t this the Lotus forums? It is all about weight and performance I thought? Nobody weighs relevant parts to check if improvement is possible? I bet when building a competitive road bike you would do 🙂 there is no difference to cars.
  21. Does anyone have the wheel weights of Lotus Evora 410 Sport (model 2017) with Michelin Cup2 tires? Anyone have the weight of the wheels alone without tires?
  22. If something is really engineered well (and with the purpose of being track legal and still offer good exhaust gas flow, it is) and well made and its looks are that good - I am basically interested 🙂 Any loved Evora deserves that kind of attention to details when you start tuning. Just feel sorry that the weight is not lower than stock. But I like the more throaty 2x3=6 cylinder sound and I expect a feelable performance improvement. At the moment I run the stock exhaust (German police is checking far too often meanwhile) but a high flow cat back system and the headers from Komo-Tec: result is that it sounds even more like a hoover (like a smooth 6 in one System) with closed valve but then when I open the throttle, the valve and the revs go up it sounds brilliantly aggressive and it really does feel much more responsive than before. But this system here is something else. But it wont be TÜV-legal overhere in Germany.
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