Quote:
Originally Posted by oil pan 4
I put the turbo on my diesel I instantly got 2 to 2.5 MPG increase. Then adding the second turbo and intercooler got me maybe another 0.5mpg.
Turbos just don't really increase the fuel economy of gas engines. On a gas engine the turbo and throttle fight each other constantly, any gains are lost there.
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On petrol turbo engines if the turbo is big enough it has no effect on FE at light to medium load.
I have personally done this on at least 4 different Honda's.
One with a .63 A/R T3 hot side and the other three with .82 A/R hotsides. All four engines had T4 compressors.
I would run them for at least a month with the stock ecu, injectors and map etc. They all drove just like before with no decrease in power. Also all had the exhaust change to 2 1/2" and one a 3" Back pressure was less or equal to pre-turbo form at light to medium load. The engines wouldn't make boost until 4000rpm at WOT.