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Wo ist die Rennstrecke?
Join Date: Mar 2004
Location: St Johns, FL
Posts: 1,211
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Inlet Air Temp Sensors
For you guys who did an EFI conversion, which IAT did you use? I am using a Bosch wire sensor, but not convinced its the best choice for this application.
Thx |
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Registered
Join Date: Jan 2003
Location: Langley,B.C.
Posts: 10,750
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I use a standard GM style one on my 3.4 NA motor.
Cheers
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Turn3 Autosport- Full Service and Race Prep jeff@turn3autosport.com 997 S 4.0, Boxster 2.7 Race Car, Cayman S 3.8, 958 Cayenne TT, VW GTI 2.1 TSI, Mini Cooper S JCW, Cannondale Supersix EVO SRAM RED E-tap, Cannondale Slice SRAM RED E-tap, Giant Roam Hardtail- to ride with the wife. |
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Registered User
Join Date: Dec 2001
Location: MA USA
Posts: 2,938
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Hi Don,
I use a Bosch one also. I can look up the part # if you want. I think mine seems to work fine. What is the problem with yours?
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Dean 911 SC turbo, 3.0L 930 motor, G50, 930 brakes, DTA EFI, 352 RWHP DynoDynamic dyno, |
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Registered
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I use the Bosch wire sensor also. I haven't had any problems.
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2014 Cayman S 2011 Cayenne Turbo 1979 930 (475 rwhp at 0.95 bar) |
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Wo ist die Rennstrecke?
Join Date: Mar 2004
Location: St Johns, FL
Posts: 1,211
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I use Bosch part 0 280 130 085, installed per Bosch's instructions. I'm not completely convinced it is as fast as it should be. Although the tech sheet shows its the fastest sensor Bosch makes, it seems to lag in varying conditions. It also seems to retain heat soak. The sensor is mounted about 6 - 8 inches before the throttle body, but after driving the car, then letting it sit for 3 - 4 hours, it will show a high temp regardless of ambient.
For example, I drove the car to work the other day, ambient about 15C which coincided with the sensor value. When I took it to lunch about 4 hours later, I felt the pipe around the sensor (cool to the touch), but the sensor showed ambient around 36C when it was about 20C. It took about 3 min for the sensor to come down to something close to ambient. While waiting for the temp to adjust the ECU thought it was hotter than it really was, and pulled fuel per the temp correction table - it ran lean until the sensor started showing ambient. It also took about 3 or 4 min for the oil temp gauge to start registering temp, so I know the engine was cool when started. |
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Registered User
Join Date: Dec 2001
Location: MA USA
Posts: 2,938
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Quote:
I have compensated for heatsoak with more fuel at those temps. Don't know if it is right but it seems to work.
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Dean 911 SC turbo, 3.0L 930 motor, G50, 930 brakes, DTA EFI, 352 RWHP DynoDynamic dyno, |
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Registered
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Do you have the ECU set for the sensor? The factory IAT sensor setting on the Motec is not the quick response Bosch unit so I was getting weird temperatures until I set it to the right sensor type.
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2014 Cayman S 2011 Cayenne Turbo 1979 930 (475 rwhp at 0.95 bar) |
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Wo ist die Rennstrecke?
Join Date: Mar 2004
Location: St Johns, FL
Posts: 1,211
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Dean - I can't adjust the temp correction because when the inlet air actually hits the higher temp, it'll be too rich. The engine coolant temp correction is already set perfectly, so I don't want to screw with that either.
David - LINK gives me two options for the sensor - a generic Bosch and custom, where you set the parameters. Tonight, I'm going to try to find the ohm value per given temp for my specific sensor. You might be right because there are two Bosch IAT sensors with slightly different curves. Thanks for the suggestions. |
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Macht Schnell
Join Date: Jun 2003
Location: PSL, FL
Posts: 861
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Quote:
I don't know what sensor I have. Touching the "outside" may not tell you much. I would get into the same situation and pull it out and check the temp with a IR temp gauge real quick. It may be dead accurate.
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---Les Garten---85 930, Andial IC, GHL Headers, Fabspeed Dual, K-27 HF2, 3.4 JE Full Finned 7.5:1 CR, 964 CAM'd, Carerra 3.2 Manifold Cut/Flipped, Tec3r, Siemans 55#, GSF Fuel Rails, Clewett Crank Trigger, Clewett Cam Trigger,Dual Plugged, ARP Head Studs/Rod Bolts, Clewett Wires.Tial 46mm WG, Tial 50mm BOV, WEVO Shifter,934 Boost Gauge, Wideband EGO Sensor/Gauge, C2T Head Gaskets, '88 MB 300TE,BMW R100RT |
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Registered
Join Date: May 2002
Location: Up North
Posts: 1,447
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I use Bosch sensor as well with mine. No issues so far.
Les made a good suggestion, though after 4 hours (& that's for lunch ? ![]() ![]()
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87 930 K27HFS/B&B/Twin-Plug... Megasquirted ![]() |
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Macht Schnell
Join Date: Jun 2003
Location: PSL, FL
Posts: 861
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I think the first step would be to "CONFIRM" that your sensor is reading wrong.
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---Les Garten---85 930, Andial IC, GHL Headers, Fabspeed Dual, K-27 HF2, 3.4 JE Full Finned 7.5:1 CR, 964 CAM'd, Carerra 3.2 Manifold Cut/Flipped, Tec3r, Siemans 55#, GSF Fuel Rails, Clewett Crank Trigger, Clewett Cam Trigger,Dual Plugged, ARP Head Studs/Rod Bolts, Clewett Wires.Tial 46mm WG, Tial 50mm BOV, WEVO Shifter,934 Boost Gauge, Wideband EGO Sensor/Gauge, C2T Head Gaskets, '88 MB 300TE,BMW R100RT |
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