nitrohead5300

I have raced both 1/8 scale and 1/10 scale cars and the 1/10 scale cars have always appear twitchy and nervous where as the 1/8 scale cars appear planted, drive alot smoother in my opinion. I hope that this class shows that the wider tires will improve the cars response to chassis setup and handling. Does anyone know when the conversion kit will go on sale?? Last summer I put a .18 tz in a R-40 everyone said it would be undrivable and it was until I put some extra wide tires on it now it is planted, it habndles really well. I hope this new 220mm class leads to a super outlaw class with OS.18TZ as the power plants.

Taylorm

........because a newbie can slam an Inferno off the boards and it will ask for more while a NTC3 will be down for the count and a newbie wants to run not wrench all day..........only after some time racing and getting deeper into the hobby......that wrenching becomes enjoyable............the GT can also be ran on garbage parking lot tracks that will frustrate a NTC3 racer..........

asw7576

Hey, I tought this wider tires conversion don't need new cars, right ? .... the costs are only GPR tires, bumper and body.

Speyederjedi

iTrader: (1)

That would be correct and confirmed. The tires take the track to 220MM wide and the only other added expense is the Lola body and bumper assembly. I've talk to a few racers her locally in San Antonio, Texas and so far they are of the same opinion as I. While the change over looks pretty cool they don't seem enclined to get involved with another class within a class. Our 200MM class is pretty good here. We generally race every Saturday and have a 200MM Sportsman Class for the Newbies and a 200MM Expert Class. Lately it's been 2 heats of 6 to 10 racers per class. All in all we like the 200MM class as is.

G4RS

going4#1

Sorry guys, I accidently started a second post related to this one. Kawahara calls GPR a 'New Category', which it is, but I used the term 1/10th GPR a new CLASS, which is a bit more familiar, at least among racers.

Anyway, my thoughts are that 1/10th nitro cars are indeed overpowered for the wheels they drive on. The wheels are too small.

Novarossi states horsepower ratings for it's engines in the 1.6~1.7hp range. At 1750 grams for weight that puts the car almost on par with 1/8th scale in terms of hp-vs-weight as 1/8th engines put out 2.6~2.8hp with cars weighing 2500 grams+ But 1/8th has considerably more contact with the ground.

For argument's sake, say one 1mm of tire touches the pavement:

1/10: 2 x 26mm + 2 x 30mm = 112mm
1/8th: 2 x 38 + 2 x 60mm = 196mm

You've definitely got a lot more friction with 1/8th which means more power is getting to the ground. For me, I find that 1/8th is a a lot more stable as well. 1/10th requires a lot more tuning to match traction conditions.

The GPR class has 30mm fronts + 40mm rears, or a total of 140mm of tire-to-pavement contact and you can see in this video of a friend I uploaded to YouTube it makes a difference.

Here is a video of a V-One-RRR lapping a 960:

http://www.youtube.com/watch?v=XBOah7AoHaU

The downside is definitely fuel consumption. The friction is going to eat up more gas. During the test we got more than 5 minutes out of the car. But will smaller 26/30mm tires fuel consumption is close to 6 mins+ This isn't a very good estimate of true consumption but the point is, bigger tires mean more fuel. Ideally 1/10th GPT cars need 90cc tanks rather than 75cc. If you race this new class, be very careful with your fuel.

Engine power has been steadily increasing in 1/10th yet the tires stay the same. Sure, settings help but unless you want to get into 3 or 4 gear centax transmissions, the power is getting wasted. This new semi-class seems like a happy medium.

Just my two cents.

BTW, if you're interested I think I can get a hold of a few GPR kits. PM me.

Rob


The car is damn quick but the engine hasn't changed.

HarKonnenD

iTrader: (23)

Awesome video, but that sedan driver was much better than the 8th guy. With or without the conversion all it takes is a better driver to lap an 8th onroad. Great points on the whole idea though to me, not to throw hatred on the class, still is no reason to resort to wider tires. There are plenty of guys who race with highly modified engines and have such neat driving lines. They simply been practicing their driving skills and learning the track. Gotta admit the cars look pretty sweet...like mini 8ths, but with the way sedan has to be driven, the larger tires and extra traction sucking up run time that'd be costly for a main.

going4#1

For me I think it's more the lola body thing over the tires that may hinder this idea more than anything.

I mean if tomorrow you expanded your standard 30 to 33mm and 26 to 28 and that gave you a faster car, more grip, and more stability with a small fuel penalty you could fix by adding 5cc to the fuel tank I could see a lot of drivers moving to that happily. It'd be kind of like going from a 75MHz radio to 2.4GHz, brushed to brushless servos, NiMH to Lipo, non-turbo to turbo crankshafts/glowplugs, plastic to carbon fibre, etc. All changes that have been important but not dramatic. All changes where drivers felt they didn't need to abandon their investment in what they like.

Kawahara may have the right idea in that their conversion uses standard 1/10th cars but I'd agree with another posts that there are already too many classes and drivers may feel class fatigue and skip 220mm. The moving from GT to Lola will probably feel too abrupt and slow or kill GPR. Some guys just like GT no matter how many advantages Lola may have.

Rob

asw7576

I have a non race car ( mtx3 ) with 200mm front trackwidth and 205mm rear trackwidth. With such track width the tires still can fit inside standard 200mm body. I use Kawahara tires 26mm and 32mm with 63mm and 66mm tire diameter, respectively.

tony montana

iTrader: (76)

I think the cars look awesome. I would run them if the class would grow. But the only thing is the cost of the engines. Nitro touring is not a cheap class to run

genesisG4

iTrader: (8)

I see your point but even in the same class there can and usually is a speed difference and the faster cars occassionally run over the slower cars.
My only point with the idea of running this class with the touring cars is that on a club level if you are struggling with car count and have 3-5 cars in the class and another 2 guys would run this conversion, why not throw them in with the touring cars and score them separately? If both classes grow enought then split them into separate classes. Don't start out making a separate class for the 1/10 GPR...then you are making the touring car guys have to make a decision on which class they want to run...give them a choice of which car and run them together and score them separately...you have touring cars and prototypes on the track together running for separate points.
This conversion could bring in some new people and bring back some old people because it is something new or they just like their looks!...think outside the box and accomodate them and your club may even add some new participants.
I obviously do not know what the speed difference would be between the touring cars and the GPR cars...I suppose if it is too much of a difference there could be issues?

asw7576

I think it's possible to mix ( as long as everyone has agree to it ).

In my recent race ( in my home track )...... in pursuit of saving time so we can go home early, the race director joined together drivers from group B and group C, so there were 14 cars racing in one final. It must be nice experiences for group C drivers doing racing for 30 minutes . The race director then split the race result accordingly after the race.

nitrohead5300

.................HarKonner we didnt put modified TZ.18 in our cars to beat small block .12,s we did to get more speed out of our cars and the boys who were silly enough to challenge us with their 12's got beat.

HarKonnenD

iTrader: (23)

Really? Drag racing doesn't count. Like I said before if you put a .18TZ in your car to beat them, then you really need to work on driving with a .12. Then again you told me your place lets you run anything so whatever I could care less.

nitrohead5300

Who said anything about drag racing?? Like I said in post 87 we did it to make our cars faster we have replaced our .12's with .18's and we run against ourselves. The boys with 12's know better they challenged us and we have beat them all. And yes we are a bunch of outlaws we run real motors , modified TZ.18's. HarKonnen you have voiced your opinion you don't like the 220mm class but you are starting to sound like a broken record. Let people decide for themselves instead of trying to force,impose your will on the rc consumer. Seems like you fear change you are going to end up like the dinosaur extinct.

itchy b

iTrader: (2)

Seems to me that you need to release your grip a little as your head is going purple!