Real world TPI hp gains

JimZ -92' AWD Tsi jzalesny at ix.netcom.com
Wed Feb 21 15:39:52 GMT 1996


You wrote: 
>
>Decreasing inlet air temp(and intake manifold temp) will increase horsepower
>with no other changes, assuming the ECM is allowed to adjust accordingly.
>Has any one dyno tested a '89 350 TPI engine and then changed only the
>thermostat (195 to 150) and removed the hot coolant going to the throttle
>body to see the net 'real world' torque increase? 
>GMD

On a a large number of EFI vehicles (if equipped)the ECU will never switch over 
to closed loop mode due to the low coolant temp.  The bypassing of the throttle 
body will work and give more power.

JimZ




More information about the Diy_efi mailing list