Shifting with a Turbo

[Norm-SV650]

Allot depends on torque, lower in the rpm band the better for mpg. Something most 4 bangers don't have hence the need for EOC and PNG. I can shift at 1500 rpms in my C5 Corvette where the SV650 it's nothing below 2K rpms with light throttle.

Add a turbo to a stock 4 cylinder and you'll see more torque at lower rpms which increases mpg in most instances. If you shifted at the same 3K rpms after adding a turbo you might not even match NA.

Depending on turbo ecu, if you stay out of positive pressure or below 100 kpa, the car should be still maintaining 14.7 or stoich which would be best for mpg.

I see you have added pistons to you Sol, change in compession?

Norm

Originally Posted by pgfpro

Not all of them.

If you have a management system and have your turbo map correctly you should be able to improve your FE and crush your N/A performance by a mile.

[pgfpro]

Originally Posted by Norm-SV650

Allot depends on torque, lower in the rpm band the better for mpg. Something most 4 bangers don't have hence the need for EOC and PNG. I can shift at 1500 rpms in my C5 Corvette where the SV650 it's nothing below 2K rpms with light throttle.

Add a turbo to a stock 4 cylinder and you'll see more torque at lower rpms which increases mpg in most instances. If you shifted at the same 3K rpms after adding a turbo you might not even match NA.

Depending on turbo ecu, if you stay out of positive pressure or below 100 kpa, the car should be still maintaining 14.7 or stoich which would be best for mpg.

I see you have added pistons to you Sol, change in compession?

Norm

Yes I have change the rods and pistons from stock. The compression now is 7.5:1

I know a lot of people will say you need to get the compression up for better efficiency but in my case with my own combustion chamber design it doesn't work right. I have tested this with an engine with a compression of 9.8:1 and the FE wasn't there.

There are major advantages to a low compression engine for FE purposes if one chooses to think outside the box

[Backtobasics]

Unmentioned so far is the benefit of heat. N/A cars build warm air for a reason. We should get better MPG in summer because of the heat.
Compressing air creates heat, and the heat aids in atomization of the fuel for better economy.