Lap Time Thread

blacksheep-1 · Mar 6, 2018

It seems that the old stick axle cars liked a 2 psi split on the heavy end, the IRS cars seem to be heading towards the same psi all the way around. The big question always is and will be..what were your target hot pressures? The difference between 37 and 50 degrees (depending also on the track surface) is about 1 psi.

Nvrfinished · Mar 6, 2018

blacksheep-1 said:
It seems that the old stick axle cars liked a 2 psi split on the heavy end, the IRS cars seem to be heading towards the same psi all the way around. The big question always is and will be..what were your target hot pressures? The difference between 37 and 50 degrees (depending also on the track surface) is about 1 psi.

I haven't figured out the target pressures yet. I started at 32. As the day warmed up, the tires were feeling better with 31 in the front and 33 in the rear. Some of this may be contributed to suspension tuning as well. I'm just starting the process.

Bellwilliam · Mar 13, 2018

get a pyrometer, that's the only way to find optimal tire pressure.

smallblock · Mar 13, 2018

Nvrfinished said:
Track: Streets of Willow
Date: 3/4/18
Best Time: 129.82
Source: Transponder
Car: 2016 S550 GTPP
Tires: 305/30R19 ContiForce Contact
Wheels: 19x11 BC Forged race spec
Suspenstion: RideTech coilovers

This was the first run with the new tire and wheel setup - also the first time at this track. It had rained the day before and the temp for the first session was 37*. It warmed up to just over 50* later in the day. The first session was not awe inspiring. Things got better a couple sessions later as the track warmed up and had multiple runs on it. I have a pretty good low speed push to work out. Lowering front tire pressure helped and the car was fairly neutral at higher speeds. Definitely a learning curve for R comp tires.

View attachment 3542

I really like your color combo. Reminds me of a 1/18 Shelby cobra model my father had when I was a kid that I wanted to steal from the showcase and rip around the carpet lol. Where did you get the stripes?

Competition Orange · Mar 13, 2018

Agree, car looks amazing in the Blue with "R" spec stripes and those wheels. Any still shots?

On my IRS car, I still find the rear needs to be down a couple PSI from front. I will see how my konis and sway bars change that this year.

Nvrfinished · Mar 14, 2018

smallblock said:
I really like your color combo. Reminds me of a 1/18 Shelby cobra model my father had when I was a kid that I wanted to steal from the showcase and rip around the carpet lol. Where did you get the stripes?

Thanks! I had the stripes installed by a local shop. They also did a clear bra on the front and along the rockers all the way to the back behind the rear wheel wells. After the stripes were installed they did a CQuartz treatment. I wanted the stripes to GT350 specs and fortunately they had one at their shop at the same time so they could get the measurements. So far with all the track days the clear bra is doing its job nicely.

Competition Orange said:
Agree, car looks amazing in the Blue with "R" spec stripes and those wheels. Any still shots?

On my IRS car, I still find the rear needs to be down a couple PSI from front. I will see how my konis and sway bars change that this year.

I have a couple of shots here that I took real quick when I was doing a quick shake down run with my track wheels and tires. My street wheels are the HRE FF04's in Tarmac.

JeffV8 · Mar 14, 2018

Hi Nvrfinished, how did you attach your splitter rods to your bumper ? And where did you get them ?

Nvrfinished · Mar 14, 2018

The rods came with the APR splitter. They are attached via holes drilled through the bottom of the bumper. I reinforced the mounting points with 3/16" thick aluminum strips that were 1" wide.

JeffV8 · Mar 14, 2018

So you attached them to the bumper cover.

Nvrfinished · Mar 14, 2018

Yes, you are correct. That's how the APR splitters are attached for these cars. With the aluminum reinforcement on the back, I'm fairly confident that I could almost stand on it without too much movement.

JeffV8 · Mar 14, 2018

Are they 1” square or 1” x X” ‘s 1 piece from strut to strut ? I used my splitter all last year doing track nights and street driving with no struts. Have been 150 mph and it stayed on. But I will add them this season.

Nvrfinished · Mar 14, 2018

I believe I cut them to a 2.5 or 3" length. I just wanted to spread the load out so that it's not concentrated on the small washer that APR provides. One thing I did was use a nylon lock nut instead of the standard nuts that come with the struts. I didn't want to have to pull the front bumper for a small nut working loose.

gtorpedo · Mar 14, 2018

Nvrfinished said:
I believe I cut them to a 2.5 or 3" length. I just wanted to spread the load out so that it's not concentrated on the small washer that APR provides. One thing I did was use a nylon lock nut instead of the standard nuts that come with the struts. I didn't want to have to pull the front bumper for a small nut working loose.

I would highly recommend securing the splitter to the frame as well. https://trackmustangsonline.com/threads/apr-carbon-fiber-gt350-splitter.12117/page-2#post-177338

boss1 · Mar 18, 2018

Track VIR Full Course 2:05.48 Aim Solo
GR 499 with Camber Plates, G loc 16/12 pads, MPSC2

Car was fun first time out.

949 Racing · Mar 18, 2018

Track: Chuckwalla Valley Raceway CW
Date: 3/18/18
Best Time: 1:59.04
Source: Aim Solo
Car: 2017 GT350
Tires: 305/30R19 RE71R
Wheels: 19x11/19x11.5
Suspenstion: FP springs, Whiteline sway bars, double camber bolts -4.5° front camber. Rest of alignment is stock. Stock drivetrain and engine.
About 75° ambient

Serpent Stang · Mar 25, 2018

Make/Model/engine/trans/packages: 2018 GTPP
Track/Course: Talladega GP Raceway
Best Lap Time: 1:06.31
Brake Pads: Stock
Tires (Size & Model): Stock
Suspension: Stock

Finally got the 2018 out on track for the first time, and it performs very well. Definitely a step up from 15-17 performance pack. If there is one thing besides the obvious wheels and tires to improve lap times, and consistency, it's brakes. Pedal feel is spongy, and non confidence inspiring, and I was able to completely cook the brakes after just a few hot laps, on a track that isn't very demanding on brakes.

I'll post a video as soon as I get it edited and uploaded to YouTube.

gtorpedo · Mar 26, 2018

Great time this weekend at VIR despite the weather not fully cooperating until Sunday afternoon. This weekend was on street tires (285 RS4s) so really looking forward to the next event with the 305 NT01's on 18x11 Apex wheels. Great meeting @DocWalt and others as well.

Car: 2015 GTPP
Track: VIR Full
Date: 3/25/18
Best Time: 2:09.85
Tires: 285/35/18 Hankook RS4
Brakes: DS1.11 front, GLOC R12 rear
Suspenstion: Ridetech coilovers
Engine: GT350 IM/TB

Bellwilliam · Mar 26, 2018

Track: Streets of Willow CW
Date: 3/24/18
Best Time: 1:22.201
Source: video
Car: 2017 GT350R
Tires: OEM Sports Cup 2 305/315 30 19
Wheels: 19x11/19x11.5 (same size as stock, but not CF)..
Suspenstion: Stock. Camber plates -3.5° front camber, -2 rear camber. Stock drivetrain and engine.
About 75° ambient, 30MPH wind...
* wind was a big issue. on 1.5 years old Michelin tires that came with the car (destroyed a set of Goodyear 3R tires last event).

Badger · Mar 26, 2018

Track: Streets of Willow CW
Date: 3/24/2018
Best Time: 1:24.455
Source: Aim SOLO
Car: 2011 S197 GT/5.0
Tires: 295/40/18 RS4
Wheels: Apex 18x11
Suspension: Vorshlag Coilovers with camber plates, LCA, UCA, Penhard
AdvanceTrac: OFF
American Muscle Cup class: Stock

Pretty windy day. Got 3 laps in before I messed up my alignment and got only a single flyer lap out of it that day.

ArizonaBOSS · Mar 26, 2018

All times updated to this point!

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