Test Results… 3S-GTE 4 EGT Temp Comparo
7/1/2001
4 Cyl EGT Comparo Info
75F – 60F in the shade
By: Pat Signorino and Shane Craddock
Shane’s Test Car (AKA Gecko2):
1991 MR2 Turbo 10PSI with 50 Trim wheel upgrade, and 1 Spal Fan on Stock Intercooler, 170 degree Stant Thermostat.
The car is not at the limit in terms of boost/heat. #2 and 3 cylinders do appear to be marginally hotter than 4 and 1. A simple EGT probe in the #3 cylinder is reccommended for all high HP Gen 1 US 3S-GTE’s. Warning temperature should be around 1550 degrees F. Once exceeded, things may already be at 1600F due to the slight lag inherent in EGT’s. If you see temps above 1600, you know that you are running lean, or something else is wrong with your engine. Keep in mind that these numbers may work for a pretty much stock car, but every car will be slightly different. Use this info at your own risk.
Hottest Cylinders in order 2,3,4,1 The difference between 1 and 2 is varying around 25 degrees F at 1400
Warm Idle Temps
Cyl
1 950
2 950
3 930
4 925
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4500rpm 62mph 3rd gear constant
Cyl Temp
1 1405
2 1425
3 1410
4 1405
3000rpm 56mph 4th gear constant
Cyl Temp
1 1415
2 1435
3 1420
4 1410
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3rd gear runs max temp shift point 7,000
Cyl Temp
1 1550
2 1575
3 1550
4 1550
4th gear runs max temp shift point 6,200
Cyl Temp
1 1550
2 1585
3 1580 (1600 reached on one pull at 7000 rpm)
4 1580
This documentation in no way replaces the Toyota MR2 Repair Manuals. The purpose of this content is only to provide supplementary information to fellow MR2 enthusiasts. Midship Runabout and its contributing authors will not be held responsible for any injury or damages that may occur as the result of practicing any of the methods or procedures described within this website. Article and photo submissions are property of the contributing author.
