Insulated air box?
Discussion
At a recent rolling road day, one of the cars (Varleyhd's Saggy) had live engine telemetry showing the various parameters that the ECU measures. One reading that got me thinking was the inlet air temperature measurement, and how high it was. 50+ degC.
Because the Speed 6 EFI system is based around a MAP sensor, inlet manifold air temp is critical to it's operation. As the inlet air temperature was quite high, the air density is consequently lower, so therefore the EFI doesn't inject as much fuel. All this results in a lower power output.
This got me wondering as to why nobody seems to insulate their air inlet and manifold? Colder inlet air = more power. Has anybody done this and did it make any difference?
Because the Speed 6 EFI system is based around a MAP sensor, inlet manifold air temp is critical to it's operation. As the inlet air temperature was quite high, the air density is consequently lower, so therefore the EFI doesn't inject as much fuel. All this results in a lower power output.
This got me wondering as to why nobody seems to insulate their air inlet and manifold? Colder inlet air = more power. Has anybody done this and did it make any difference?
dvs_dave said:
At a recent rolling road day, one of the cars (Varleyhd's Saggy) had live engine telemetry showing the various parameters that the ECU measures. One reading that got me thinking was the inlet air temperature measurement, and how high it was. 50+ degC.
Because the Speed 6 EFI system is based around a MAP sensor, inlet manifold air temp is critical to it's operation. As the inlet air temperature was quite high, the air density is consequently lower, so therefore the EFI doesn't inject as much fuel. All this results in a lower power output.
This got me wondering as to why nobody seems to insulate their air inlet and manifold? Colder inlet air = more power. Has anybody done this and did it make any difference?
presumably this was a symptom of the poor ventilation in the unfinished dyno cell? (assuming youre on about the tvr power day) air temp was 30C plus so a bit of airbox heating and all of a sudden 50C is plausible. It wouldnt e that high out on the road as spend suggests.Because the Speed 6 EFI system is based around a MAP sensor, inlet manifold air temp is critical to it's operation. As the inlet air temperature was quite high, the air density is consequently lower, so therefore the EFI doesn't inject as much fuel. All this results in a lower power output.
This got me wondering as to why nobody seems to insulate their air inlet and manifold? Colder inlet air = more power. Has anybody done this and did it make any difference?
the other side of the coin is that the dyno will have air temp compensations built in so although the engine will have been down on power because of heated inlet air, the figures produced will be corrected for air temp.
lowering air temps most certainly does make a difference for power though, so is a good thing to do anyway, but on the sp6 cars the inlet is opposite the exhaust so how much you'll gain you will have to try and let us all know. It does make a difference on the dyno on v8 cerbs though with their airboxes directly over the exhausts, however out on the road with the greater airflow through the engine bay the results difference would be less impressive than recorded on the dyno.
in short : its a good idea to do it, but don't expect too much.
Edited by spitfire4v8 on Monday 21st September 13:40
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