TravisJB Journal

travisjb · 04-23-2010, 11:29 PM

Quote:

Originally Posted by LateralG'z

Travis, i am loving all the difficult plowing you are doing with your car. You are saving me tons of time and learning.

Thanks. Following your build as well - would use the same exhaust if I were keeping to the street... good progress!

travisjb · 04-27-2010, 11:53 PM

Thanks Mike!

Junior- hellanicejob!

travisjb · 04-28-2010, 07:49 PM

There are forums that go deep on these kinds of topics, so don't want to do that here but the quick story is that I was shooting in near dark with a high quality lens and a canon 5d mark ii. Lens has a great big f-stop and camera has an iso range of like 50 to 25,000... which is crazy... the physics are as chris described, and you can reproduce the effect if you have the right gear or through post-processing

RCZ · 04-28-2010, 07:59 PM

Again with the mini pictures Travis?? You should put a roofscoop in to get some air into the cabin.

travisjb · 04-28-2010, 08:09 PM

haha, no, that was a reply to a post from like 12 months ago!

RCZ · 04-28-2010, 08:13 PM

Wouldve been way more sick if you had gone zonda R style and used a roof scoop to get air into that rear diff cooler.

Fathead · 04-29-2010, 10:08 AM

We can always poke a whole in your car and do it.

RCZ · 04-29-2010, 05:27 PM

My none race car??? That would b rice

travisjb · 04-29-2010, 07:08 PM

Car is at Xact dyno and will be UpRev tuned tonight... will be interesting to see if we get any gains... stay tuned! haha

UPDATE: he can't find the OBD 2 port! Must be taped up under the dash somewhere

I will run the car on Sunday at PIR and update here after the weekend

travisjb · 04-29-2010, 08:04 PM

My aero coach sent me some homework to do!

Quote:

Some of the guidance I gave you previously was off base with regard to the splitter, gurney flaps, and underbody diffuser. I am putting together some trade equations so you can play around with what the impact on downforce and drag will be for the various options versus the cost. Can you send me the following information when you get a chance so I can develop the trade calculations:

1) what is the brand, model, height above deck lid, width (span), length (chord), and angle of attack you have your rear wing set to currently?
2) what is the width of the front splitter, the length at the centerline (chord), the distance from the leading edge to the ground, and the distance from the trailing edge to the ground when it is installed?
3) what is the ground clearance between the front clip without the front splitter installed?
4) what would the average ground clearance be if you installed an underbody tray (trying to get a feel for how much ground clearance you have on average)?
5) what is the average radial gap between the tires and the wheel wells for the front and also the rear?
6) what is the cross-sectional area of the "blunt nose" portion (~ perpendicular to the ground) of the front clip?
7) What is the cross sectional area of the tail section for a plane ~ perpendicular to the ground?
8) what is the approximate height and width of the "rear hump" on the deck lid we talked about shaving off?
9) what is the cross sectional area of the side scoop inlet ducts, what diameter ducting are you running now, and what is the size of the license plate cut-out?
10) what is the approximate cross sectional area looking from the front of the car that you would eliminate if you replaced the front headlights with contoured sheet metal (give to me on a per headlight basis)?
11) what is the approximate cross sectional area looking from the rear of the car that you would eliminate if you replaced the rear taillights with contoured sheet metal (give to me on a per taillight basis)?
12) what is the current ground clearance and length of the sections on each side of the car where you incorporate side skirts?

Also, if you can get the following information it would be helpful for assessing the dynamic stability and help with tuning the downforce between the front and rear of the car:

1) approximate current wet gross weight of car
2) approximate axial location of center of gravity as a percentage of the overall distance between the centers of the front and rear wheels

Mike · 04-29-2010, 08:15 PM

looks like you have a busy night!!!!!

travisjb · 04-29-2010, 10:28 PM

yup... and if anyone wants to help answer some of these, welcome the input!

tim @ xact dyno just called... the car baselined 300 whp on the nose... unfortunately we weren't able to do any tuning because the ecu detects too much voltage without the hvac modules plugged in... we're going to have to run it again next week with that stuff plugged back in...

Tim estimates that the car is running lean and we should be able to squeeze around +20 whp out of it... if that's true, then my target weight for this car based upon my NASA time trial target of 8.7lbs/whp will be 2,784 pounds! In short, impossible!

Hey Stan, whatya' doing with that Rotrex SC unit!?

LateralG'z · 04-29-2010, 11:10 PM

I got the same results as you travis, 300 hp and 245 torque, just got back from an uprev tune and added 15 hp & 5 torque, good luck with your tune.
On a side note: I am really surprised with my exhaust the output I achieved.

Quote:

Originally Posted by travisjb

yup... and if anyone wants to help answer some of these, welcome the input!

tim @ xact dyno just called... the car baselined 300 whp on the nose... unfortunately we weren't able to do any tuning because the ecu detects too much voltage without the hvac modules plugged in... we're going to have to run it again next week with that stuff plugged back in...

Tim estimates that the car is running lean and we should be able to squeeze around +20 whp out of it... if that's true, then my target weight for this car based upon my NASA time trial target of 8.7lbs/whp will be 2,784 pounds! In short, impossible!

Hey Stan, whatya' doing with that Rotrex SC unit!?

Bluemeanie · 04-30-2010, 07:18 AM

Quote:

Originally Posted by travisjb

yup... and if anyone wants to help answer some of these, welcome the input!

tim @ xact dyno just called... the car baselined 300 whp on the nose... unfortunately we weren't able to do any tuning because the ecu detects too much voltage without the hvac modules plugged in... we're going to have to run it again next week with that stuff plugged back in...

Tim estimates that the car is running lean and we should be able to squeeze around +20 whp out of it... if that's true, then my target weight for this car based upon my NASA time trial target of 8.7lbs/whp will be 2,784 pounds! In short, impossible!

Hey Stan, whatya' doing with that Rotrex SC unit!?

It's sitting at the shop collecting dust until I decide what to do. Should I ask why

PM sent

LateralG'z · 05-01-2010, 02:14 PM

Travis, when you got your tune with the Uprev could you only tune up to 6400 rpm?, we could only Tune up to 6400 rpm instead 7500, they said we have to ratio this out and I am very unsure about this, my ECU was a new one they had to create from and they got it back really fast but that seems totally wrong since I know the 350Z people don't have to do this with their car. Any help would be nice just want to clarify so I am not going nuts. I like the software though, it seems to have lots of potential.

04-27-2010, 11:53 PM	#2 (permalink)
travisjb A True Z Fanatic Join Date: Jan 2009 Location: GSO Posts: 2,803 Drives: VIR Rep Power: 190	Thanks Mike! Junior- hellanicejob! __________________ 2009 370Z #104 For Sale

04-28-2010, 07:49 PM	#3 (permalink)
travisjb A True Z Fanatic Join Date: Jan 2009 Location: GSO Posts: 2,803 Drives: VIR Rep Power: 190	There are forums that go deep on these kinds of topics, so don't want to do that here but the quick story is that I was shooting in near dark with a high quality lens and a canon 5d mark ii. Lens has a great big f-stop and camera has an iso range of like 50 to 25,000... which is crazy... the physics are as chris described, and you can reproduce the effect if you have the right gear or through post-processing __________________ 2009 370Z #104 For Sale

04-28-2010, 08:09 PM	#5 (permalink)
travisjb A True Z Fanatic Join Date: Jan 2009 Location: GSO Posts: 2,803 Drives: VIR Rep Power: 190	haha, no, that was a reply to a post from like 12 months ago! __________________ 2009 370Z #104 For Sale

04-29-2010, 07:08 PM	#9 (permalink)
travisjb A True Z Fanatic Join Date: Jan 2009 Location: GSO Posts: 2,803 Drives: VIR Rep Power: 190	Car is at Xact dyno and will be UpRev tuned tonight... will be interesting to see if we get any gains... stay tuned! haha UPDATE: he can't find the OBD 2 port! Must be taped up under the dash somewhere I will run the car on Sunday at PIR and update here after the weekend __________________ 2009 370Z #104 For Sale Last edited by travisjb; 04-29-2010 at 08:05 PM.

04-29-2010, 08:15 PM	#11 (permalink)
Mike The370Z.com Sponsor Join Date: Jun 2009 Location: Loganville, GA Posts: 5,944 Drives: 370z Rep Power: 2187	looks like you have a busy night!!!!! __________________ NISSAN: 75 280Z / 86 300ZX GLL /87 Sentra SE / 03 350Z / 23 Z Porsche: 93 968 / 23 Macan GTS / 93 968

04-28-2010, 07:59 PM	#4 (permalink)
RCZ A True Z Fanatic Join Date: Nov 2008 Location: Miami Posts: 6,403 Drives: '09 370Z Rep Power: 1120	Again with the mini pictures Travis?? You should put a roofscoop in to get some air into the cabin.

04-28-2010, 08:13 PM	#6 (permalink)
RCZ A True Z Fanatic Join Date: Nov 2008 Location: Miami Posts: 6,403 Drives: '09 370Z Rep Power: 1120	Wouldve been way more sick if you had gone zonda R style and used a roof scoop to get air into that rear diff cooler.

04-29-2010, 10:08 AM	#7 (permalink)
Fathead Base Member Join Date: Sep 2009 Location: Arizona Posts: 62 Drives: Chevy Trucks Rep Power: 17	We can always poke a whole in your car and do it.

04-29-2010, 05:27 PM	#8 (permalink)
RCZ A True Z Fanatic Join Date: Nov 2008 Location: Miami Posts: 6,403 Drives: '09 370Z Rep Power: 1120	My none race car??? That would b rice

04-29-2010, 10:28 PM	#12 (permalink)
travisjb A True Z Fanatic Join Date: Jan 2009 Location: GSO Posts: 2,803 Drives: VIR Rep Power: 190	yup... and if anyone wants to help answer some of these, welcome the input! tim @ xact dyno just called... the car baselined 300 whp on the nose... unfortunately we weren't able to do any tuning because the ecu detects too much voltage without the hvac modules plugged in... we're going to have to run it again next week with that stuff plugged back in... Tim estimates that the car is running lean and we should be able to squeeze around +20 whp out of it... if that's true, then my target weight for this car based upon my NASA time trial target of 8.7lbs/whp will be 2,784 pounds! In short, impossible! Hey Stan, whatya' doing with that Rotrex SC unit!? __________________ 2009 370Z #104 For Sale Last edited by travisjb; 04-29-2010 at 10:31 PM.

05-01-2010, 02:14 PM	#15 (permalink)
LateralG'z Track Member Join Date: Nov 2009 Location: Oklahoma Posts: 876 Drives: 370z Rep Power: 18	Travis, when you got your tune with the Uprev could you only tune up to 6400 rpm?, we could only Tune up to 6400 rpm instead 7500, they said we have to ratio this out and I am very unsure about this, my ECU was a new one they had to create from and they got it back really fast but that seems totally wrong since I know the 350Z people don't have to do this with their car. Any help would be nice just want to clarify so I am not going nuts. I like the software though, it seems to have lots of potential. __________________ 2010 Mag Black, 6MT,

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