Conti Challenge at CTMS

Mick_12Nismo · 07-10-2014, 03:29 PM

Glad to see that the 41 car's rebuild was finished in time and that the Toronto boys not only were able to make it out on their "hometown" track, but that they had pretty good pace in practice today.

41 FARANO/EMPRINGHAM NISSAN 370Z Fastest lap: 1:29.081

1.635 behind leader and about .4 off of BJ/Brad's pace

Best luck this weekend to both the 14 and 41 cars!

Mick

Dwnshift · 07-12-2014, 07:21 AM

41 is actually a brand new chassis which the boys finished in a week !

Hopefully this is much like watkins glen and the big guns burn off tires after 5 laps.

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Dwnshift · 07-13-2014, 04:26 PM

Bad day yesterday... Def not good gearing for the Z.
Indy in two weeks

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GSS138 · 07-14-2014, 03:45 PM

Are you guys allowed to change transmission gears? Or is that outside of GS rules?

Dwnshift · 07-15-2014, 03:34 AM

We are allowed ring and pinion and that is all.

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Mick_12Nismo · 07-15-2014, 02:03 PM

It was a fun race to watch although it was tough sledding for you guys. Those Camaros and Mustangs were damn fast all day long. Did the 41 retire with mechanical issues, go off track or something else? I never heard and didn't see anything from where I was shooting.

Here's a link to an image of the 14 on the downhill lefty going towards Moss Corner:

http://www.oconnor-photography.com/CTMP/n-ncgxB/

Mick

Dwnshift · 07-15-2014, 10:26 PM

Yes 41 had something let go in the bellhousing. I havent been to the shop to see what it was exactly.
We were fast... Just not with cars in front of us.

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Dwnshift · 07-15-2014, 10:27 PM

Great shot btw

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GSS138 · 07-16-2014, 12:37 PM

Quote:

Originally Posted by Dwnshift

We are allowed ring and pinion and that is all.

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Don't suppose you would tell us which ratio?

I am trying to decide on this still myelf. Torn between the 4.08 and 3.9. It almost seems like 4.34 would be a decent race only setup since you would get more use out of 6th.

wstar · 07-16-2014, 07:47 PM

^ I did a long series of analysis on my rear end ratio options a while back with math and graphs, just to confirm basic intuitions and whatnot: I basically ended up deciding that on paper in terms of power under the curve averaged across all reasonable track speeds, you always want to go to the biggest rear ratio possible unless you're running out of top speed in top gear. The fundamental reason for that is that the ratios between gears in the stock transmissions get smaller the further you shift up.

The only real mitigating factors are these: (1) You'll shift more often. If your shifts cost significant time (and they do unless you have some amazing formula-car electronic sequential), you could lose time in the net and (2) The higher gears might be weaker in a given street-car transmission and break earlier if spend so much time in them. I think especially on the 7AT that's a very valid concern, and that's what keeps me from trying something insane like a 4.9 (it exists!).

In an ideal world, of course, you'd just swap the ratios in the transmission itself so that they're all closer and optimal (and you'd tune ratios to each track you ran).

Dwnshift · 07-20-2014, 04:03 PM

4.08 mandated

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07-10-2014, 03:29 PM	#1 (permalink)
Mick_12Nismo Base Member Join Date: Jun 2012 Location: Western New York Posts: 104 Drives: 2019 C7 Grand Sport Rep Power: 13	Conti Challenge at CTMS Glad to see that the 41 car's rebuild was finished in time and that the Toronto boys not only were able to make it out on their "hometown" track, but that they had pretty good pace in practice today. 41 FARANO/EMPRINGHAM NISSAN 370Z Fastest lap: 1:29.081 1.635 behind leader and about .4 off of BJ/Brad's pace Best luck this weekend to both the 14 and 41 cars! Mick __________________ [SOLD] 2012 Metallic Black NISMO 370z #499

07-12-2014, 07:21 AM	#2 (permalink)
Dwnshift Track Member Join Date: Feb 2012 Location: Cincy Posts: 717 Drives: NISMO 370Z RC Rep Power: 14	41 is actually a brand new chassis which the boys finished in a week ! Hopefully this is much like watkins glen and the big guns burn off tires after 5 laps. Sent from my iPhone using Tapatalk Hotrodz likes this.

07-14-2014, 03:45 PM	#4 (permalink)
GSS138 Track Member Join Date: Mar 2013 Location: Mission Viejo, CA Posts: 769 Drives: '12 370Z 6M Sport Rep Power: 13	Are you guys allowed to change transmission gears? Or is that outside of GS rules? __________________ Current Mods: Vorpal Weapon +5.

07-15-2014, 02:03 PM	#6 (permalink)
Mick_12Nismo Base Member Join Date: Jun 2012 Location: Western New York Posts: 104 Drives: 2019 C7 Grand Sport Rep Power: 13	It was a fun race to watch although it was tough sledding for you guys. Those Camaros and Mustangs were damn fast all day long. Did the 41 retire with mechanical issues, go off track or something else? I never heard and didn't see anything from where I was shooting. Here's a link to an image of the 14 on the downhill lefty going towards Moss Corner: http://www.oconnor-photography.com/CTMP/n-ncgxB/ Mick __________________ [SOLD] 2012 Metallic Black NISMO 370z #499 Last edited by Mick_12Nismo; 07-15-2014 at 02:08 PM.

07-16-2014, 07:47 PM	#10 (permalink)
wstar A True Z Fanatic Join Date: Mar 2009 Location: Houston, TX Posts: 4,024 Drives: too slow Rep Power: 3594	^ I did a long series of analysis on my rear end ratio options a while back with math and graphs, just to confirm basic intuitions and whatnot: I basically ended up deciding that on paper in terms of power under the curve averaged across all reasonable track speeds, you always want to go to the biggest rear ratio possible unless you're running out of top speed in top gear. The fundamental reason for that is that the ratios between gears in the stock transmissions get smaller the further you shift up. The only real mitigating factors are these: (1) You'll shift more often. If your shifts cost significant time (and they do unless you have some amazing formula-car electronic sequential), you could lose time in the net and (2) The higher gears might be weaker in a given street-car transmission and break earlier if spend so much time in them. I think especially on the 7AT that's a very valid concern, and that's what keeps me from trying something insane like a 4.9 (it exists!). In an ideal world, of course, you'd just swap the ratios in the transmission itself so that they're all closer and optimal (and you'd tune ratios to each track you ran). GSS138 likes this. __________________ 7AT Track Car! Journal thread / Car setup details

07-13-2014, 04:26 PM	#3 (permalink)
Dwnshift Track Member Join Date: Feb 2012 Location: Cincy Posts: 717 Drives: NISMO 370Z RC Rep Power: 14	Bad day yesterday... Def not good gearing for the Z. Indy in two weeks Sent from my iPhone using Tapatalk

07-15-2014, 03:34 AM	#5 (permalink)
Dwnshift Track Member Join Date: Feb 2012 Location: Cincy Posts: 717 Drives: NISMO 370Z RC Rep Power: 14	We are allowed ring and pinion and that is all. Sent from my iPhone using Tapatalk

07-15-2014, 10:26 PM	#7 (permalink)
Dwnshift Track Member Join Date: Feb 2012 Location: Cincy Posts: 717 Drives: NISMO 370Z RC Rep Power: 14	Yes 41 had something let go in the bellhousing. I havent been to the shop to see what it was exactly. We were fast... Just not with cars in front of us. Sent from my iPhone using Tapatalk

07-15-2014, 10:27 PM	#8 (permalink)
Dwnshift Track Member Join Date: Feb 2012 Location: Cincy Posts: 717 Drives: NISMO 370Z RC Rep Power: 14	Great shot btw Sent from my iPhone using Tapatalk

07-20-2014, 04:03 PM	#11 (permalink)
Dwnshift Track Member Join Date: Feb 2012 Location: Cincy Posts: 717 Drives: NISMO 370Z RC Rep Power: 14	4.08 mandated Sent from my iPhone using Tapatalk GSS138 likes this.

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