TravisJB Journal

FuszNissan · 03-31-2010, 04:39 PM

Quote:

Originally Posted by travisjb

got my new center console that should make me eligible for RTA... thanks Lou!

ChrisSlicks · 03-31-2010, 05:18 PM

Quote:

Originally Posted by travisjb

chris, interesting that you're running hotter on the outside... perhaps you're running lower tire temps and 'rolling over' on the tire?? are you talking autocross or road course?

Autocross, haven't made it to a track yet this year, it's been raining like a bast'ed. I suspect that on track my tire temps will reverse.

travisjb · 03-31-2010, 05:52 PM

makes sense, chris...

Zless@arizona · 03-31-2010, 11:35 PM

Quote:

Originally Posted by import111

Since some #'s are being thrown out there, I will throw mine in too, though since I was on street tires my #'s may not matter very much. Stock wheels all 4 corners, BC BR series coil-overs with 10k/8k F/R spring rates.
front:
-stock tires @ 36.5 psi cold
rear:
-Nitto NT05's @ 35 psi cold

Both front and rear tires were 25-30 degrees hotter on the inside, than the outside.

I may be flamed for this response, and I accept it with great humility. Reason for humility: My 30-year old chick-boss told me that my knowledge is no longer applicable to current operations. I was born 20 years before she, and I have several Graduate School degrees more than she, and I know our business more than she, and she asks me, "What do I do, Greg?"...Yet I am bypassed for promotion. I digress! My useless/old info question is: racing Tire Pressures are, typically, higher than OEM recommended PSI. Why are you running only 36.5 (1.5 over stock)???? Call the tire manufacturer for racing PSI. R/S, Greg

travisjb · 04-01-2010, 12:06 AM

Greg, thanks, and stop being bashful!... just say what you mean

I'm trying out different PSIs... yes, some guys run 40+ hot with their Hoosiers... my goal is to figure out which PSIs yield the best times - trial and error - that is all

Zless@arizona · 04-01-2010, 12:42 AM

Quote:

Originally Posted by travisjb

Greg, thanks, and stop being bashful!... just say what you mean

I'm trying out different PSIs... yes, some guys run 40+ hot with their Hoosiers... my goal is to figure out which PSIs yield the best times - trial and error - that is all

Thank you, Travisjb, for the encouragement! I will attempt to post what I really think, but my greatest fear is being redlined/blocked from this post, and life in general. Always here for PM...at your service Greg

(this is the only "bow-down" html I could find)

ChrisSlicks · 04-01-2010, 11:37 AM

I experimented a lot with tire pressure as well, with stock camber I was using 38.5 front, 35 rear, and after adjusting the camber I found that 36 front 34.5 rear was the ideal for maximum grip on my setup with RE-11's. Everyone will be a little different as it will vary depending on car setup, tires, and driver.

travisjb · 04-01-2010, 12:53 PM

and of course maximum perceived grip is usually different than best time around track... hoosiers are known for this

Zless@arizona · 04-04-2010, 10:35 PM

Quote:

Originally Posted by travisjb

and of course maximum perceived grip is usually different than best time around track... hoosiers are known for this

You have stumbled upon the holy grail of racing! Michael shumacher was able to dismiss the feeling, so that he could lap faster than anyone (minus a few bumping mishaps).

travisjb · 04-04-2010, 11:26 PM

yeah, what's up with Shumi today ? rain... malaysia... supposed to be his day! argh

So, the Ford truck is great, but alternator went bad... took the opp'n to put in 2 dry cell optima red tops... going to upgrade as things break... the trailer lights aren't working right either, but not sure there's an upgrade for those

Will post some pics of the trailer soon... it's 99% set up now and I'm starting to get into the routine of using it and loading / unloading... really pleased with the purchase

I carved out the rear license plate area today with a die cutter and sawz'all... then installed a black s/s wire mesh w/ snap rivets... looks okay - my fabrication work isn't as good as Junior's!

Will be at the Import Tuner event with Sharif this Saturday at Firebird Main - he'll be driving his GTR

Zeto · 04-05-2010, 08:35 AM

Quote:

Originally Posted by Zless@arizona

You have stumbled upon the holy grail of racing! Michael shumacher was able to dismiss the feeling, so that he could lap faster than anyone (minus a few bumping mishaps).

This is really go to know.

Zeto · 04-05-2010, 08:37 AM

Quote:

Originally Posted by ChrisSlicks

I experimented a lot with tire pressure as well, with stock camber I was using 38.5 front, 35 rear, and after adjusting the camber I found that 36 front 34.5 rear was the ideal for maximum grip on my setup with RE-11's. Everyone will be a little different as it will vary depending on car setup, tires, and driver.

Thanks for the insight. i just mounted 285/255 RE-11's and I wasn't sure what tire pressures would be optimal. One question, wouldn't it be better to have a stiffer rear tire side wall with higher PSI to avoid rolling?

Sharif@Forged · 04-05-2010, 08:41 AM

Quote:

Originally Posted by travisjb

Will be at the Import Tuner event with Sharif this Saturday at Firebird Main - he'll be driving his GTR

Hey Travis, our GT-R crushed it's 4th gear two weekend's ago, and I had to scramble to find a new gearset. It doesn't look like the car will be ready for the Tuner Shootout.

Still trying to secure a backup car, but it's not looking very promising at this point. It's a shame because we were looking to improve on our 3rd place podium finish from last year.

travisjb · 04-05-2010, 10:21 AM

bah, who needs 4th gear ! lol

hope you get it sorted out !

ChrisSlicks · 04-05-2010, 11:38 AM

Quote:

Originally Posted by Zeto

Thanks for the insight. i just mounted 285/255 RE-11's and I wasn't sure what tire pressures would be optimal. One question, wouldn't it be better to have a stiffer rear tire side wall with higher PSI to avoid rolling?

That all depends on how your car is setup. From the factory you have slightly more rear camber than front camber, and the rear can be adjusted to around -2.0 with stock suspension. It's typically the front that rolls the tire edge the most during cornering, it's the heaviest part of the car and experiences the most loading.

The pressures I quoted are if you have after-market sway bars installed with adjustable front camber. With stock sway bars there will be more body roll and you will need slightly higher pressures to compensate.

03-31-2010, 05:52 PM	#888 (permalink)
travisjb A True Z Fanatic Join Date: Jan 2009 Location: GSO Posts: 2,803 Drives: VIR Rep Power: 188	makes sense, chris... __________________ 2009 370Z #104 For Sale

04-01-2010, 12:06 AM	#890 (permalink)
travisjb A True Z Fanatic Join Date: Jan 2009 Location: GSO Posts: 2,803 Drives: VIR Rep Power: 188	Greg, thanks, and stop being bashful!... just say what you mean I'm trying out different PSIs... yes, some guys run 40+ hot with their Hoosiers... my goal is to figure out which PSIs yield the best times - trial and error - that is all __________________ 2009 370Z #104 For Sale

04-01-2010, 11:37 AM	#892 (permalink)
ChrisSlicks A True Z Fanatic Join Date: Mar 2009 Location: North East Posts: 6,203 Drives: 09 370Z Sport M6 Rep Power: 653	I experimented a lot with tire pressure as well, with stock camber I was using 38.5 front, 35 rear, and after adjusting the camber I found that 36 front 34.5 rear was the ideal for maximum grip on my setup with RE-11's. Everyone will be a little different as it will vary depending on car setup, tires, and driver. __________________ Hotchkis ARB \| Stillen CAI \| Art Pipes \| Berk CBE \| Stillen AP Racing Brakes \| AE Performance Oil Cooler \| BC Racing ER Coilovers \| Doran Control Arms

04-01-2010, 12:53 PM	#893 (permalink)
travisjb A True Z Fanatic Join Date: Jan 2009 Location: GSO Posts: 2,803 Drives: VIR Rep Power: 188	and of course maximum perceived grip is usually different than best time around track... hoosiers are known for this __________________ 2009 370Z #104 For Sale

04-04-2010, 11:26 PM	#895 (permalink)
travisjb A True Z Fanatic Join Date: Jan 2009 Location: GSO Posts: 2,803 Drives: VIR Rep Power: 188	yeah, what's up with Shumi today ? rain... malaysia... supposed to be his day! argh So, the Ford truck is great, but alternator went bad... took the opp'n to put in 2 dry cell optima red tops... going to upgrade as things break... the trailer lights aren't working right either, but not sure there's an upgrade for those Will post some pics of the trailer soon... it's 99% set up now and I'm starting to get into the routine of using it and loading / unloading... really pleased with the purchase I carved out the rear license plate area today with a die cutter and sawz'all... then installed a black s/s wire mesh w/ snap rivets... looks okay - my fabrication work isn't as good as Junior's! Will be at the Import Tuner event with Sharif this Saturday at Firebird Main - he'll be driving his GTR __________________ 2009 370Z #104 For Sale

04-05-2010, 10:21 AM	#899 (permalink)
travisjb A True Z Fanatic Join Date: Jan 2009 Location: GSO Posts: 2,803 Drives: VIR Rep Power: 188	bah, who needs 4th gear ! lol hope you get it sorted out ! __________________ 2009 370Z #104 For Sale

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