Unlocking GT4 RS's Full Potential: Essential Mods & Track Setup

Hey everyone! In this video my good friend Barry and I dive deep into the world of GT4 RS modifications and track setup! We’ll share our experiences and insights on enhancing the performance, safety, and overall driving experience of getting our GT4 RS optimized for the track.
We’ll explore a wide range of topics related to our GT4 RS mods, covering everything from wheels and tires to alignment, safety measures, interior upgrades, data acquisition systems, exhaust enhancements, and high-performance braking systems.
First off, we delve into the realm of wheels and tires, discussing how to get more rubber under the car. We'll share our insight into the parts needed to make this happen. Next up, we move on to track alignment, discussing proper camber, toe, and ARB settings. No GT4 RS upgrade is complete without addressing the exhaust system. Join us as we discuss the different exhaust options available, from enhancing the engine note to increasing power. We’ll then go over track brake upgrades to ensure consistent, fade-free, stopping power. Safety is paramount when pushing the limits on the track, and we emphasize the importance of equipping your GT4 RS with the necessary safety enhancements. From roll bars to harnesses we discuss the products that have worked for us. To track our progress and gather valuable data, we discuss the data acquisition systems and mounts that worked in our cars.
We hope you all enjoyed the video! Big thanks to Barry for taking the time to come on the channel!
Barry’s channel: @BarryAtWhyNotGoPro
GT4 RS Parts: Upgrade Links
SAFETY
BBI Porsche GT4 RS StreetCup Harness Bar
bbiautosport.c...
Schroth Endurance 6 point
www.schroth.co...
Cantrell Motorsports Sub Belt Bar
cantrellmotors...
ALIGNMENT
Tarett Race Design Front Camber Plates
tarett.com/pro...
Immocars Rear Camber Plates
[e-mail]
SPL Rear Toe Arms
www.splparts.c...
WHEELS AND TIRES
Finspeed Wheels
finspeed.com
Hoosier R7
www.tirerack.c...
EXHAUST
SOUL Competition Over Axle Pipes
soulpp.com/pro...
BRAKES
Ferodo DS3.12 Pads
www.ferodoraci...
E-Motion Braided Carbon Stainless Brake Lines
emotionenginee...
Castrol SRF
www.amazon.com...
DATA ACQUISITION
Garmin Catalyst
www.garmin.com...
T-Design Tablet Holder
t-design9.com/...
INTERIOR
TPC Seat Angle Brackets
www.tpcracing....
TS Porsche LWB Seat Recliner Brackets
www.trackspeca...
AWE Foiler Wind Diffusers
awe-tuning.com...
EdGuard Seat Bolster Covers
www.edguardusa...
EdGuard Headrest Covers
www.edguardusa...
Rennline Floor Mats
www.rennline.c...
Rennline Pedals
www.rennline.c...
Timestamps:
0:00 - Introduction
0:37 - Wheels and Tires
1:37 - Alignment: Camber and Toe
5:33 - Track Session: Thoughts after mods
8:56 - Summary: Alignment
9:30 - Performance: Exhaust
12:13 - Brakes: Pads & Lines
15:50 - Safety: Harness bar
19:36 - Data Acquisition: Garmin Catalyst

[@pfan12000]

Thanks for the great info. One safety note is when using 6 pt race harnesses you need to use Simpson hybrid or HANS devices from breaking your neck during a crash.

[@agooberss]

AP Racing brake fluid has a higher boiling point and Girodisc rotors with their race pads took my NSX to another level. Learned about them at the Watkins Glen PCA event where most GT3s were runnung wuthout any issues for days. I've tried Willwood & Stoptech, but the Girodiscs were the best

[@brysonlewis4737]

That's way cool! Really appreciate the graphics and info too!

[@flatsixer105]

Loop some electrical tape on the sides of the Garmin Mount. This will provide a little more grip/thicknesswhen you push it in to place on the dash.. A buddy of mine had that same issue on the track with this thing falling out on him in the middle of a session. This solved it for good. Nice video.

[@coltcarter8071]

Man you guys are in it deep

[@Mike-j2q5x]

Not sure if I am just not seeing it, but is there a link to a spreadsheet with the alignment settings that you found to work best? Thanks for a very informative video!

[@hernanorihuela3230]

Great technical talk guys. I like the mods. My Soul Over the axle is coming on Wednesday. Eager to see if I can get the alleged 30 wheel go gain. I went with Ferrodos and I love them

[@ItsTrackTime]

Great to hear the video help! Check out our Soul exhaust video for the dyno plots. kzbin.info/www/bejne/oGXNZXWsq796eMUsi=z0uYTYLnBHSQ1BWR

[@hernanorihuela3230]

@@ItsTrackTime thanks, gaining 27 hp and 27 ft Lbs of torque sound exciting

[@vdbgt3542]

Great video. Watched it twice now. 4RS arrives in a month, so getting parts coming. Did y’all have to slit the bottom cushions to fit the sub belt through, or are they ready slotted? Passenger side buckets carbon has to be cut out also, correct?

[@barryminor2]

Driver seat has a slit already open for the sub-belt. Passenger seat needs to be cut but the factory sewed it in such a way that this is an easy mod.

[@vdbgt3542]

@@barryminor2 thank you. Been trying to find this answer everywhere!

[@ReelGUS13]

Have you guys had any rubbing on the fender liners with the hoosiers? I too wanted to stay with 20's and Apex told me a 265 would be too tall for the front AND rear. I find this hard to believe if you guys are both running the same set up. They offer a +52 20x9 front, so just a couple mm inwards from stock. The +61 is pretty incredible.

[@ignitionontheleft]

We had to install front camber plates and that allowed the 265 clearance

[@ReelGUS13]

@@ignitionontheleft Thats what I figured. Thanks!

[@JAMESmikkel63]

Good vid bro!

[@beninvictoria]

Super helpful! My burning question…..how did all these mods combined (suspension, OAP, brakes) impact your lap times? Significant? Also, my friend and I both stick the catalyst suction cup right on the PCM screen and have had no damage or residual marks…..

[@barryminor2]

We started with these settings so I don't have a stock baseline. With a pro driver in the car, mid way through our setup process, the car did a 2:19 at COTA. I'm guessing he could get a 2:17 with our current setup but that will have to wait for cooler temps in Texas. I will also say that we could easily pass the other GT4 RS's in our run group with these settings. Interesting comment on the Catalyst suction cup working on the PCM screen. Never would have thought of that.

[@beninvictoria]

@@barryminor2 thanks for sharing and thanks for the comprehensive setup video!

[@KhaledAmr]

Hi, thanks for the video. what is the the car hight front and back. TY

[@ignitionontheleft]

1,267 mm

[@arta9769]

Thank you guys, it was a great discussion. thank you for all the info. I don't know if you guys did the rotors with pads or just pads but i highly recommend girodisc or Ap rotors because you will possibly notice little cracks on the oem rotors with ferodo pads after three or four track days. Did the OAP change the sound inside the cabin noise or just outside?

[@barryminor2]

Yes Girodisc will be the replacement rotors for us but I wanted to burn through the factory iron rotors first. Thanks for the heads up on the cracks, I'll be watching for these now.

[@barryminor2]

Over axle pipes only changed the sound outside. I didn't notice any change in volume inside or added drone.

[@991tts4]

super helpful video for gt4rs owners thanks ! Did you able to gain time on same track after theese modifications ?

[@digitalwingstrokes]

Hello, please give your recommendation about wheel offset for running 265 in front and 305 in back, many thanks 🙏

[@ignitionontheleft]

Thats what I'm running in hoosiers and have had positive results. 295's in the rears felt like the tail wanted to come around. 305's solved that.

[@digitalwingstrokes]

What is your experience driving on track with 265 in the front compared to 245? Some people have stability issues and go back to the original! BTW what offset do you have on your wheels? @@ignitionontheleft

[@iamcharliekay]

Thanks for the info. Do you know what offset the wheels were to fit 265s at the front?

[@ItsTrackTime]

Front = 61mm Rear = 50mm

[@arta9769]

Barry, do you remember the offset for the wheels? thanks

[@ItsTrackTime]

Front = 61mm Rear = 50mm

[@arta9769]

61 mm?? are you sure? because the oem front 20x8.5 is 61 mm. if you go to 20x9 , 61mm won't fit with -3 camber. it's okay i will confirm with finspeed guy@@ItsTrackTime

[@DarkTouch]

you can roll the fenders slightly to run 305's. easier than messing with the suspension, especially it costs a lot less. a baseball bat and an experienced hand...

[@Leowavekid]

What did all these mode cost ?

[@ignitionontheleft]

Best not to ask. Barry probably has a spreadsheet somewhere...

[@Leowavekid]

@@ignitionontheleft HAHA😅

[@flsupraguy]

As much as I'm thankful Porsche put the gt3 engine in a cayman the facts are the GT4RS will never be near as fast as a GT3 due to it's smaller wheelbase....

[@ignitionontheleft]

Explain?

[@flsupraguy]

@@ignitionontheleft the gt4rs cannot carry the same cornering speed as the gt3 in the mid to high speed corners as the gt3 primarily due to the smaller chassis size and difference in suspension geometry

[@HondaExige1]

The GT4RS has a longer wheelbase than a 992GT3. Primary cornering difference will be down to tyre width. The 911 can accommodate wider tyres - secondly the suspension layout, struts Vs Wishbone.