Toyota GT86 CS-CUP tires
 

The tires on Toyota GT86 CS-CUP racer are shown as 245 620/17 on 17x8 O.Z. Racing wheels. Are they the same size as 245/40-17 street tires? And the wheels look like Ultraleggera to me. Anybody can confirm?

Another link:https://www.caranddriver.com/news/to...s-of-pure-want

The CS-Cup car runs on slick tires. It is a car just for racing and not street legal. If you like the rims, then you can use them. Try in a tire size calculator to find a tire that doesn't deviates too much from stock tire diameter.

Off topic but that's crazy that we are sitting with 600 lbs of extra weight compared to these cup cars.

Yes, but nobody normally wants to daily drive a car in that stripped condition.

By the way, I found that 620 is the tire height in millimeters for racing tire specs. Height of 245/40-17 is (17*25.4)+(2*245*40/100)=627.8 mm

So 245/40-17 is the closest size to 245 620/17; they are approximately the same size tire and TMG's choice for racing with 17x8 wheels. And, before somebody points out, racing slicks have different compound and structure. I was asking the question regarding size only and I wonder what size they install as grooved rain tires.

I'm waiting for someone to tell them how those wheels and tires are slower than heavier, narrower wheels and tires.

^^I really love that livery! Awesome.


http://www.japanesesportcars.com/gal...022218-004.jpg

You didn't notice the comment of Impureclient. These are very light stripped down cars with many changes in the engine area too. They are quite powerful and they are close to the range of an ordinary 86/BRZ equipped with an entry level supercharger. They have enough power to use these wheels and tires.

Not quite.

And I imagine that is at the crank, as they where comparing to the stock HP numbers for 205/151

You are right. CS-CUP has 1110 kg (2440 lbs) curb weight and 212 HP power which means 11.5 lbs/HP power weight ratio. My JRSC has 2800 lbs curb weight and 300 HP power which is 9.3 lbs/HP. That is not even close.

Is 300HP "entry level supercharger"? Imho something like cossworth 2.0 of 250hp with regular pulley and unbuilt engine/unchanged tranny, is more like such. Still, as seen better numbers then those 212 with uncatted header and tune, so exchanging that extra lightening for less gains, i expect these cars to accelerate similar.

Yes 300 HP (not whp, since 212 is not whp either) is entry level JRSC kit installed on a completely stock engine. I agree that these cars should have better acceleration than 212 HP sounds like. They have more upgrades than just power such as racing differential, transmission, *and tires* etc.

Lighter car, close to stock power numbers, yet tires wider than 225, with slicks even. They must be slow.

Yeah *very* slow. Even a minivan ...

Entry level Innovate setup is good for 220whp with stock header and FP/OP with Perrin CB. I know guys with the JRSC are seeing a lot better numbers, and all kits benefit a lot from having header/FP/OP. 250-275whp is fairly common on low boost in those setups.
https://rallyways.com/8932/superchar...anyon-carving/


Hard to say what crank HP would be. If we say that a stock car at 205 crank is 170whp then we could estimate that the 220whp car is around 265-270.

The wheels are 17x8 +50 offset OZ. Not listed as Ultraleggera but look like Ultraleggera.

- Andrew

I've seen the wheels in person. They do look like Ultraleggaras, but they have non-aluminum inserts for the lug nuts. They aren't cheap.

They're actually not too expensive (and we carry them and all the TMG parts). I'm actually surprised how reasonable the cost is on most of the TMG parts. If anyone is interested, let me know.

Stainless steel inserts for the lug nuts is really nice...my BRAIDs have them.

- Andrew

Other than durability, are there any other benefits to the steel inserts? Are there any other differences between the TMG wheel and the standard Ultraleggera?

Bragging rights.

Just more durability if you're taking them on and off a lot. And the inserts are replaceable. And bragging rights I guess.

Not sure on any other differences with standard Ultraleggera, other than that and offset.

- Andrew

What type of TMG parts do you carry?



Basically can a customer pick something out of their online catalogue and ask you for a quote on an item?

Basically everything except the seats and harness.

Coilovers, brakes, wheels, intake, exhaust, etc.

- Andrew

Racecomp Engineering: weren't TMG cars also with own header & ecu tune? Are those available options too?

Well this unbelievably exciting news for me and the car and bad news for my wallet.


I was under the impression you had to be a registered race team/own a cup car to be able to access those parts. Although this is just based on a single post that I saw when I was trying to find the TMG Intake.



There seems to be a real lack of knowledge concerning these parts. Do you think it's just because they are so rare/hard to acquire or because the aftermarket generally tends to come up with better solutions?

Yes, those too. :)

The header is one of the more expensive parts, but it's available.

We can get pretty much everything. I do not have an idea of what lead times are like yet though. Let me know what you're interested in and I can work with you on all of that.

I think the rarity/availability is a big part of it and the fact that there just isn't a lot of information on the parts. But also these are very specifically designed and built for a spec race series...MOST aftermarket parts here are designed with major concern for streetability. Obviously the type of part will affect how much that changes the design (or not) but these are race parts first and foremost.

EDIT: my assumption is that most aftermarket parts would be clear step behind the TMG parts, seeing as they just won Le Mans ;) But results may vary. There are a couple parts I'd really like to get my hands on for myself.

- Andrew

Wait a minute! I wanna see that. Gimme link, please!

Just that isn't TMG's header catless? And imho tune to accompany it might be only "official one" with adjusted cat readiness checks for that, whereas all other ecu tuning shops need to disable those checks for CEL to not get thrown :)

I'll PM you.

See below. :)

(Although the cats are not in the header, they're much farther back in the system like a lot of race cars)

- Andrew

If they are downstream O2 sensors, then ecu tune should work just as good on completely catless exhaust. And if it is just "software", then chance of it being just different firmware flashable on stock ecu-s, not something like for Motec :)

I really wanna see how the TMG header will look like.

Header:

http://toyota.ricambio.net/site/page...asp&CETAVF=svg

I wouldn't bet that much on the TMG cars. They are nice on the one-make racing series here in Germany, but not that successful when racing with other cars in same category. I think that they never managed to get a 1st place position. If you want to build a serious race track car, try to find more information about the Gazoo Racing 86 car. It won twice the Nurburging 24h race in its category (SP3 class). Once in 2012 and another time in 2014.

Hmm, interesting. EL, 4-2-1, long tube runners reusing overpipe part Ace-alike, no flange & no cat. And probably Ace-alike without proper ECU tune won't show full gains. Ace consists of less individual unwelded parts & merge angles are shallower, but still seems closest to design of this (though of course, independent development).

What do you think the Gazoo racing car is based on?
Gazoo Racing = TMG. I would bet that they are near identical in terms of parts.



The TMG cars can run in the SP3 class in N24.

Nice. Reminds me of the ACE Anaconda header

Identical parts? Lol. You don't know what you're talking about. The TMG exhaust was made by Bastuck which is based in Germany. The Gazoo Racing cars had a Fujitsubo exhaust. Same with the suspension Bilstein vs. Kyb , the wheels OZ vs. BBS Japan and so on. Do your homework better next time.

Simmer down bro.

Okie dokie :)

You're right they're totally different. The header back exhaust, wheels and shock totally make it a new vehicle.

You can take a look at all the parts these cars use and their list prices in euros here: http://toyota.ricambio.net/site/page...=CE_150#CE_150

It'd be fun to build a street version using these parts. Gotta love double adjustable bilsteins and the aero bits. Big fan of the front lip assembly and side skirts. The wheels do look like Ultraleggera and interestingly it appears the cars use wheel spacers.