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NASA ST/ TT4/ GLTC K24Z SWAP NA RACECAR

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Old Jan 12, 2026 | 12:18 PM
  #1  
spencer9474's Avatar
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From: Little Elm, TX
Default NASA ST/ TT4/ GLTC K24Z SWAP NA RACECAR

Currently optimized for NASA ST/TT4 rules at 210 whp/2390 lbs with driver, driven properly the car has pace to crush current local lap records in TT. The car has been extremely solid and reliable, runs cool and could easily be converted to run GLTC or any enduro series, as I built the car with endurance racing in mind. Will include 2 sets of wheels and new tires; 1 set with brand new 245/40 RT660s mounted, 1 set with heat cycled R7s mounted (will include a set of fresh 245/40 R7s as well). The car will include a few spares and several new parts I haven't gotten around to installing, but in it's current form it is ready to race. Can provide a more detailed full parts/mod breakdown for anyone interested. Asking $32,500, feel free to make offers, but I am in no rush to sell.

Some highlights:
Walker Pro Motorsports FIA roll cage
Lifeline Zero 360 2.25 KG Fire Suppression
ECU Master EMU Black engine management
ECU Master PMU16 pdm w/12 button CAN keypad
Full club level wiring harness (all oem wiring removed)
AIM MXL2 dash logger
K24Z3 Engine swap (211hp/172tq) tuned on pump E85
6 speed / 4.10 Tomei 1.5 way diff
AST 5100 shocks w/ 20K(F)/11K (R) swift springs
V8R 11.75 STR-42 BBK / Sport Rear w/PFC11 pads
Front miatahubs/fresh rear hubs bearings
Spherical bearings in all front locations
Sadfab poly-bronze bushings in rear
9Lives Racing rear wing
KazeSpec Engineering front aero package

PB Lap Times
1:17.8 - MSR Cresson1.7
CCW 1:21.8 - Hallet
CCW 2:04.3 - ECR 2.7 CCW










Last edited by spencer9474; Jan 19, 2026 at 01:59 PM.
Old Jan 12, 2026 | 01:37 PM
  #2  
Fireindc's Avatar
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Jesus, this thing is nice. GLWS
Old Jan 12, 2026 | 02:51 PM
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From: San Jose
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How did you get your K24Z to 210whp and where is your redline set, if I may ask?

I'm sitting at 200 at the wheels with a completely stock K24Z on 91. I've moved my redline down a bunch due to vibration...
Old Jan 12, 2026 | 03:02 PM
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spencer9474's Avatar
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Nothing really, my only thought is maybe the E85 helps. I've been spinning it to 8200 RPM and do regular bolt checks and apart from the exhaust separating at the downpipe/midpipe connection on my initial track shakedown I really haven't had anything come loose.

Attached dyno graph form from NASA Certification.
Attached Files
File Type: pdf
SPRO NASA Cert 2-17-2022.pdf (445.7 KB, 19 views)
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