2021–NSR GT3 (Q2-2021)

FRONT TIRE RUBBING
You are allowed to remove the studs and trim the back of the light buckets and add a washer to the front post if needed.
GT3 FRONT TIRE RUBBING

NSR TIRE TRUING NOTES
COMPATIBLE NSR TIRE TRUERS

I have 300 laps on my mostly stock Corvette with 25k motor and stock gears.  The front guide is the deep wood guide.  There is some lead in the chassis now.  In front of the front tires were two posts on the chassis that did not serve any purpose other than to groove my low profile tires and stop any coasting!  They have been clipped.  My best lap today was 4.195 driving pretty conservatively, only pulling the trigger 100% on the front straight most of the way out of the curve.   Very little brake and nice slow sensitivity.  I decided not to change the drive train until we figure out what works better than stock.  Drive for me April 10th while I am at the Leander baseball game.  All the best, for I hope, my last semi-"proxy" race.

Russell - I have the spur gears you are looking for.  Let me know if you would like me to leave them at the track for you to tryout.  We can swap for the ones you ordered once they arrive.

RUSS - yes I too spent several hours this Sat & Sun trying to either a) break 4.1 or b) have a car that did not jack-rabbit in the straights or fishtail in the corners. The Supergrips marbled a little and contributed to both the jumps and slides.

After too many 4.4s, I switched back from the 22k motor to the 25k OEM motor; and went back and forth from the 32z (OEM) to 31z spurs. With the 32z I could barely break high 4.3s; with the 31z I clocked a few mid and high 4.2s but mainly stayed in the 4.3s My pinion is a 11z (OEM spec).

I also experienced more rubbing on the front tires (I need to double-check to see if I am running the 17mm or 19mm NSR-No-Grips)

I don't have a lot of experience or parts for NSR.  My Corvette came with the 25K motor.  I tried it for the first time today with a 33-tooth spur; it was undrivable.  Even with weight it was very twitchy, especially under braking at the ends of the long straights.  I ordered 34- and 35-tooth gears today.  I still plan on running with the 25K motor, hoping that the higher numerical gearing will be enough to calm it down.  I am ordering a 36-tooth gear as well.

Russell

TA - of course we will race it : )
We will put it into rotation and select one or even perhaps 3 people (proxy style) to drive it.
...
I will be closely checking your Reifen to ensure they are legal - no experimental BFG compounds are allowed ... no gluing NSR over the original sidewall names etc.

I fully planned to race my Corvette in person, but my grandson is pitching his last high school season and the game this week is Saturday.  I will leave my car at the club and you can decide to run it or not in the race.

Hey - I hate to drop this on you guys but here's some calcs that defy the recent idea of using the 22k/21.5k motors (at 11v). Since we are using S/W gears our options are limited.
Also - I did the numbers using 12v and 11v and not surprisingly, 11v favors the 25k motor and 12v favors the 22k/21,5 motor.

11 VOLTS
25,000 motor rated, * 11/12v = 22,800 effective
Rear wheel RPM Ratio Spur/pinion
8085 2.82 31/11
8056 2.83 34/12
7835 2.91 32/11 OEM/Stock

22/21.5 rated, avg of 21,750 * 11/12v = 19,938 effective
Rear wheel RPM Ratio Spur/pinion
8100 2.46 32/13
7975 2.50 30/12
7728 2.58 31/12

12 VOLTS
25,000 motor rated
Rear wheel RPM Ratio Spur/pinion
8091 3.09 34/11

22/21.5 rated, avg of 21,750
Rear wheel RPM Ratio Spur/pinion
8146 2.67 32/12
7967 2.73 30/11
7713 2.82 31/11

So - at this point I am thinking we should stick with 11 volts since if most people have stuck with the stock motor there are less gear combinations they have to experiment with.

IDEAS?

TUNING NOTES
MOTOR - At the series voltage of 11v, some people testing Vettes are experiencing the 25k motor to be "too-hot" (jackrabbit hops and fishtails); even with Low gearing (e.g. the OEM 32/11 = 2.91 ratio, or 33/11 = 3.0).
Conversely, the 22k or 21.5k motors may need Higher gearing (2.82, 2.73) to go below 4.3s.

BALANCE - the nose on the Vettes are light, so some weight behind the guide (~3 to 4gm) or on the nose of the motor-pod (~ 5-7gm) may be something to experiment with.

SM COMMENTS:
ERIK (and others)
1 Re BMW-#1 Z4, if you are planning on the White Presentation livery- that should be NP.
2 If you can attend, great - yes show up masked and enter the fray.
3 If you cant (b/c of the kart race) - you can either drop that Round (the normal process) or leave your car and ask someone to be your Driver for round-1.
4 In general, anyone wanting to field a car but not able to attend (regardless if due to Covid, health, travel issues); they can hire another member as their driver.

(I am considering hiring John to build my car and Steven to drive - based on recent GP-C history LOL. I will deal with sponsors, organizing the VIP Tent and post race parties etc.)

Seriously - if you want to enter a car but cannot attend in person, reach out to another member ... let's keep this simple and 'easy'

Erik

I plan on driving my own car and I believe Randy does as well.  Presumably if someone else wants to enter the race but is yet reluctant to race at HQ, one of the members that does attend could race his car as a proxy driver.  We should, therefore be able to run the race as a regular owner/driver series.

Russell

So based on the notes from last weekend's meeting, this GT3 event will be a "driver present" event and not proxy. I do want to verify that before I pull the plug on a car. I plan on running the BMW Z4 Presentation Livery, but only if I can drive it. Sorry - but proxies just don't excite me. The livery comes as a #1, but I can change that if the Audi's already existing #1 is a hiccup to the plan.

I need to get caught up on my reading of our expectations...I THINK we're allowing masked men to show up at the events. With many of us getting the vaccine or on the list, and since I've been able to successfully avoid getting the 'vid with how I am managing my interactions, I'd be comfy jumping back into in-person action.

I don't have a car yet, but I plan on getting caught up a bit over the weekend on our messages and will likely make a purchase since I love GT3 cars. I may not make the 10th as that is planned to be my first kart race down in New Braunfels, but if it rains, we don't race due to the extra slippery nature of the concrete there...it becomes a true skating rink, even with rain tires so for safety's sake they tend to cancel. In that event, I'd love to be slotting.

NEED RSVP - 'register' for NSR-GT3 race.
We need to balance out all the good-ole-boyz Vetts with some:
ASVs(AMs), R8s (OoOoO), Z4s (Bimmer), Mercs, 997s (goenfausten)

Tough luck Marty! Who is coming up on you, Ary or Shawn?
Nice looking car, but that pan looks so aerodynamic I need to check the rules on it ...

I will be running the Audi R8 that I used in the clubs Modern GT series back in 2016.  The car has some miles on it but should be up for the test against the large field of Corvettes.  Here are the images of the car new and one of the crash that took out the rear wing and caused some additional body damage.

SETUP NOTES: After 20 minutes of painstakingly adjusting my axle/tire height, when thumbing my front tires with the car on its back, I discovered them rubbing the oddly shaped light buckets. Carefully grinding down all the various bumps from the bucket will be Permitted to resolve the contact; as well as adding a thin washer to the body post; or other innovative ideas. NO, truing the tires some more did not completely remove the contact; and I am running the stock size NSR-ZeroGrips. Note: I did Not have this contact issue with my C6R in 2016.

WEIGHT TUNING NOTES: My C7R Wheelbase is 85mm (axle to axle). Centerline is 42.5mm, appx 2mm forward of the Drop-Arm pivot  (The Centerline is placed over the middle of the gap between the scales)

My C7R Vette weighs 75gm; the textbook weight distribution is between:
Front 40% / 30gm       Rear: 60% / 45gm
Front 45% / 33.75gm  Rear: 55% / 41.25gm

As stock, my car's distribution was:
Front 36% / 27gm        Rear: 64% / 48gm

Adding 5gm to the nose of the pod[1]: car=80gm
Front 40% / 32gm        Rear: 60% / 48gm

NOTES: Each model will have different centerlines; each car will have unique weights. Depending on the location the weight is added, will affect the front/rear balance[1]; weights on the Pan "wings" may be easier to tune than a single weight on the motor pod.

Thanks Randy and Russ! Is anyone going to field one of these? ASVs, R8s, Z4s, Mercs, 997s

I have just ordered this car:

Russell

Looks great Randy; looking forward to you racing 1x1 again!

P.S. If anyone is using the Thunderslot Foam Donuts; the "donut holes" can be trimmed to be used as Wing supports.
-- Cut one edge flat; measure wing strut length (appx 4-5mm); cut bottom flat; trim leading and trailing edges with angular cuts. Keep width to match the top (fattest part) of the struts.
-- After the angles look good; glue to the inside of the wing struts with a small dab of ShoeGoo.
100% Optional

here is my car and i will race either proxy or in person.  I will not change the number or anything else except maybe add a BFG decal.  Yes it is sitting in front of Mr. NSR Corvette's pit box.

NSR GT3 TEAM OWNERS - Please 'register' yourself and car here:
-- Identify the car you plan to enter (livery/#/driver name; or vintage/white-kit/test GT3s with model/color/# etc.  Optionally: add image from your phone, the WWW, of the model you plan to enter.
-- If you are entering a custom livery  an image of the full size car is OK
-- Duplicates Permitted - as usual please change the Number, Wing Color etc.
-- Write name on bottom of car with silver or white Sharpie

That is a beautiful car.  Can't wait for the series to begin.

Do we know how many people will be participating in this series?

Ready for some tuning laps!

UPDATE:  Any NSR gears are allowed.  If you have an older GT3 car that you can make legal for this series - whatever NSR gears you have in it can be used.  Whatever pinion and spur diameter (OD) combinations you can make work will be OK.
Required: OEM Pinion: 6.45mm-DIA 11z NSR-6911A (NSR does not have any other 6.45 pinions)

Guys I have listed all the generic parts that are either mandatory (so u can buy spares) or Optional.  Sorry - I will not list ALL model specific parts such as the Hard White chassis or Extra Hard Green chassis - you are smart enough to find and buy those.
Options: Chassis OEM Black/Medium hardness; Recommended: Hard-White or Extra-Hard-Green chassis
Examples:  ASV WH1459, GR1488; C7 WH1492, GR1494; R8 WH1475, GR1486; Z4 WH1463, GR1489 etc.
...
Required: OEM Pinion: 6.45mm-DIA 11z  NSR-6911A (NSR does not have any other 6.45 pinions)
Option: Sidewinder Spurs OEM 17.5mm-DIA 32z NSR-6032;  6030, 6031 - 6037
Open-Choice: Gear-Ratio (OEM: 32/11 = 2.91 therefore rear wheel RPM 7,875 = (25,000 * 11v/12v) / 2.91)
HOT:  31/11 = 2.82 ~ rear wheel RPM 8,127    IFFY 30/11 = 2.73 ~ 8,395

GUIDE is 4859, correctly stated in the rules.
Rules are current and correct.  If not - let me know :twisted:
.......
If buying a new or replacement GT3, consider adding these items to your cart:

NSR4859 guide (x2 one for GT3, the other for the F-86/89)
Spare Zero-Grips (NSR-5226) 18dx8w -or- (NSR-5201) 17dx8w   Spare Supergrips (NSR-5230) 20dx11w
Brass axle adjustment screws. https://www.professormotor.com/product-p/pmtr1146.htm
A Shark-3041-21.5k (rated at 21.9k) motor if you plan to experiment with motors; https://www.professormotor.com/product-p/nsr3041.htm
24z and 25z INLINE crowns for the F-86/89 - make sure they are for the 3/32 axle (not 2mm) with part #s like nsr6324, nsr6325 https://www.professormotor.com/product-p/nsr6324br.htm

The Professor Motor site calls the deep wood guide NSR NSR4859 Deep Wood Guide with High Performance Screw Mount.  Is the the one you meant as our option instead of 4869 (not listed)?

I'm going to order a long wood track screw mount guide.  I do not think we should go with the lexan cockpit because I like the full cockpit look.  Allow any Shark 25 or less.   I may order the hard chassis if you allow that and the wise tuners use them, but not a new motor pod.