Toyota GR Corolla Forum - Ownership Discussion banner

Hank's GR Build - From an Engineer's Perspective

31K views 105 replies 33 participants last post by  Hank  
#1 · (Edited)
For those that may not know, I have a similar build thread on FocusRS.org [here] and personal Build Diary website for my 2016 Ford Focus RS (weekend/autox). www.HanksRS.com.

This thread will be dedicated to my 2023 GR Corolla Circuit Edition (daily driver).
Follow along at my personal Build Diary website: www.HanksGR.com

Build Date History:
Build Date: 04/17/23
Arrived at Dealer: 06/13/23
Trailered home: 06/22/23, 06/23/23

Goals for my GR:
1. Bring a smile to my face each time behind the wheel.
2. Make total strangers come up to me and ask questions.
3. Run 12s in the 1/4 mile on 93 octane gas and street tires.
4. Survive weekend trips around the Louisiana countryside on its crappy roads.

Planned future mods:
1. More power
2. Tasteful weight reduction

Completed so far:
1. Window Tint (07/08/23)
2. First Detail + PPF (12/23/23)
3. Wheel Locks (12/27/23)
4. Blackvue Dashcams (12/28/23)
5. V1 Radar Detector (12/28/23)
6. Modern Spare Tire Kit (01/09/24)
7. LED Rear Bumper Reflectors (01/16/24)
8. Longer Rear Wiper (01/26/24)
9. Delta X Pitch Mount (02/02/24)
10. First Oil Change (02/02/24)
11. 2024 Model Year Updates (02/04/24)
12. Eventuri Engine Cover (03/10/24)
13. Eventuri Intake (03/10/24, 03/23/24)
14. ECUTEK Flash Tune (03/17/24)
15. ProClip Cellphone Dash Mount (04/02/24)
16. Forge Motorsport Intercooler Kit (04/06/24)
17. P1660-14 DTC Fix (04/23/24)
18. Delta X Pitch Mount V2.0 (06/15/24)
19. Ethanol Content Analyzer (07/14/24)
20. Front Bumper Fix (07/12/25)

Current Cost of Mods = $6,837.50 [Spreadsheet Link]

Current Datalog Results = ECU Connect App [Spreadsheet Link]

Current Certified Weight = TBD (x/x tank of fuel)
Current Race Weight = TBD (1/4 - 3/8 tank of fuel)

Current Total # of Launches (UniClutch Track) = 7 [Spreadsheet Link]
*Note: I never launched on the stock clutch. It slipped with my E30 tune and I replaced it.

Best 1/4 mile pass while modified:
12.703@110.92mph [Details Here]

Pictures along the way:
Trailered her home.

Image


Image


Image


Image
 
Discussion starter · #7 ·
What are your plans for more power?
First I have to find a reliable tuner that has a ton of happy GR Corolla clients. I'm limited on power in my Focus RS because of the stock block. I learn by example. Once enough folks take the plunge and start making reliable power, I will decide how much will fix my needs.
 
Discussion starter · #11 · (Edited)
Pictures along the way:
First Detail + PPF installed. More information here.

Notes:
1) Full body PPF with Suntek Ultra Tack. Then entire GRC was ceramic coated with Feynlab products.

Image


Image


Image


Image


Image


Image


Image


Image


Image
 
Discussion starter · #16 · (Edited)
Pictures along the way:
Modern Spare Tire Kit installed. More information here.

Notes:
1) Instead of purchasing additional hold down rings from Toyota and using a ratchet strap, I opted for a Rivnut and hold down bolt in a factory hole in the GR Corolla's hatchback floor. And there's actually another section of flooring below the Rivnut thanks to Toyota.

Image


Image


Image


Image


Image


Image


Image


Image


Image
 
Discussion starter · #18 · (Edited)
Pictures along the way:
LED Rear Bumper Reflectors installed. More information here.

Notes:
1) I did not go with aftermarket Chinesium reflectors with LED strips already installed that burn out in a week or so.
2) I purchased HD LED Red Strip accent lights from Diode Dynamics (made in the USA) that include a 3-year warranty.
3) By installing the LED strips into the factory reflectors, I maintain safety when my GR is parked with the lights off and a vehicle approaches it from behind.
4) I could not find a plug-n-play harness, therefore I had to cut/solder/heat shrink the factory tail light harness INSIDE the hatch area.
5) I did NOT remove the rear bumper or tail lights to complete this modification! Drilled (2) factory plugs in the hatch floor for wiring grommets!
6) Total of (84) pictures (some annotated) on my how-to page in the link above.
7) I apologize in advance for the filthiness of my GRC. This icy winter bullsh*t sucks. 😖

Image


Image


Image


Image


Image


Image


Image


Image


Image


Image


Image


Image


Image


Image
 
Discussion starter · #20 ·
Nice work! Amazing how nice those rear LEDs look at night. Wish that had been factory setup.

Do you have a total budget figure in mind, or just go until you meet your objectives for the car?
Thanks for the compliments. No real budget. It is a daily compared to my Focus RS autox build. I'll just document it for my build website so others will know the costs.
 
  • Like
Reactions: Cerberos
Discussion starter · #22 ·
It looks like there is only 2 wires to the strip itself but you have 3 spliced in. I wonder if the dim and full function is in the power inverter. I like the clean and solid led look. Once Mine burn out that would be the next option. I need to test this with my flasher set up.
Below is a little verbiage about the driver from the Diode Dynamics specs for the HD LED Red Strip. I opted for running light and brake light functions only. It would look funny to me for a vertical LED strip to be used as a turn signal.

PWM Control: Aside from the high brightness and perfectly uniform output, one great feature of these strips is the integrated multifunction PWM dimming control. The drivers have four wires, to be connected to any 12V signals as follows:

White: White Low Power, 50% brightness
Red: White High Power, 100% brightness
Yellow: Amber Signal, double brightness, flashing (dims if powered more than two seconds)
Black: Ground
 
  • Helpful
Reactions: snowrx
Discussion starter · #23 ·
Pictures along the way:
Longer Rear Wiper installed. More information here.

Notes:
1) Factory rear wiper is 12" long.
2) I purchased a Bosch rear wiper that's 16" long from O'Reilly Auto Parts for $14.
3) I continue to apologize for the filthiness of my GRC. This icy winter bullsh*t sucks. :cry:

Image


Image


Image


Image


Image
 
Discussion starter · #29 ·
Pictures along the way:
Delta X Motorsport Pitch Mount installed. More information here.

Notes:
1) Both undertrays need to be removed.
2) I purchased both 60A and 70A bushing sets from Delta X. Trying 60A first.
3) Install requires (3) torque wrenches to cover the broad range of torques.
4) Delta X mentions a break-in period for any of the bushings. Some NVH will be generated no matter what.
5) Total of (29) images on my personal build site with tons of information to complete the swap.

Image


Image


Image


Image


Image
 
Discussion starter · #30 ·
Pictures along the way:
Completed first oil change at 1,177 miles. More information here.

Notes:
1) Only the engine lower access panel needs to be removed.
2) Torque the oil drain plug to 30 lb-ft with a new crush washer. Oil filter is hand-tightened with a lubricated o-ring.
3) Manual calls for 4.5 quarts of oil with a filter change.
4) After changing the oil, run the engine until warm, shut it off, then check oil level on the dipstick after 3 minutes.
5) Total of (19) images on my personal build site with more information on completing the oil change.

Image


Image


Image


Image


Image


Image
 
  • Like
Reactions: Bryota_GR
Discussion starter · #32 ·
Pictures along the way:
2024 Model Year Updates installed. More information here.

Notes:
1) Total of (5) undertray panels need to be removed. No wiring plugs need to be removed for this install.
2) Install took about 2 hours. The (4) bolts were easy. I took my time with the ducting/aluminum tape to figure out the easiest method.
3) As a mechanical engineer I'm not sure what is really different about the replacement bolts.
- New rear subframe bolts have 3 impressions at the tip (OE has 4). New bolts have 24mm head (OE is 22mm). Washers same diameter.​
- New rear subframe bolts have less taper at tip on new bolts. Maybe cases of lost preload?​
- New steering rack bolts look identical except head marking (10 vs 1). Change in material of construction?​
- New steering rack nuts are identical as manual calls out replacing if bolt is changed.​
4) Total of (80) images on my personal build site with more information on completing these updates.

Image


Image


Image


Image


Image


Image


Image


Image


Image


Image


Image


Image


Image


Image


Image
 
Discussion starter · #36 ·
For those folks considering the Delta X Motorsport (or alternate) pitch mount for their GR Corolla, below is a video of my car with the 60A bushings installed after a break-in period of 600 miles. In this video my A/C is on while idling in a parking lot.

It's definitely not for the driver that is easily irritated by a slight increase in NVH. I'm living with it for the performance benefit and I like to see my wife's boobies jiggle.

 
Discussion starter · #39 ·
Hank,

Was there an outline from the factory for the magic tape inside the bumper skin?
On my GRC there were outlines inside the front/rear bumpers to place the aluminum tape. Because I thought most (if not all) of the 2023 GRCs had those same outlines, I didn't document the measurements in my how-to on the 2024 Model Year Updates. It turns out some 2023 GRCs didn't have those outlines. My GRC has a build date of 04/17/23. I have no clue what build dates have or don't have the bumper outlines.
 
Discussion starter · #40 ·
Decided to go with Stratified Automotive Controls as my tuner. Ordered an ECUTEK dongle and license. Asked for (2) fuel tunes (93 octane and E30).

Debating on purchasing an Eventuri intake.
 
Discussion starter · #41 ·
Pictures along the way:
Eventuri intake installed. More information here.

Notes:
1) Undertrays don't need to be removed unless you drop something and you don't have a magnet retrieval tool.
2) Several wiring plugs need to be disconnected (MAF sensor, intake valve/flap, PCV sensor).
3) The factory airbox vacuum solenoid plug is disconnected and tucked away not to be used for the Eventuri intake.
4) Do NOT overtighten anything touching the carbon fiber. It is brittle and can be crushed!
5) Arrow on the MAF sensor points towards the firewall.
6) Total of (95) images on my personal build site with tons of information to complete the install.

Image


Image


Image


Image


Image


Image


Image


Image


Image


Image


Image
 
Discussion starter · #43 ·
Pictures along the way:
Eventuri engine cover installed. More information here.

Notes:
1) Easy installation. Tug on the (4) corners of the factory engine cover. Swap over the (4) grommets from old to new cover.
2) Very easy to steal. I would not leave my engine bay unattended during a car show with this bling.
3) Total of (13) images on my personal build site with tons of information to complete the install.

Image


Image


Image


Image


Image


Image
 
  • Like
Reactions: Bryota_GR