EDIT : the tuning was incorrectly done . Information in the first few posts is misleading .
The dyno tuning was redone and gave much better results than indicated in first post
Rather skip to Post 14 in the thread
For academical purpose here follows my experience :
2F Block overbore 0.060" ( Toyota pistons and rings )
ARP conrod bolts
Delta 250S cam
SBC valve springs
Dyno graph - Efi engine with stock compression ratio ( aftermarket ecu )
As you can see the engine power was still climbing when the tuner stopped the run .
In comparison : The carbed engine with higher compression ratio ( 3F carb head with kidney shape chambers and 9,5:1 CR )
I find it strange that the Torque of the carbed engine shows it to be higher at 2000 rpm than with the Fuel injection - when I drive it , it "feels" like there power at lower revs with the new Fi . Strictly speaking the graph of the carbed engine looks like it performs better than the Fi-engine . It was done on two different dyno machines , two years apart .
If fuel consumption is lower with Fi then I regard the process as a success - if not ... well I enjoyed the research and development .
The dyno tuning was redone and gave much better results than indicated in first post
Rather skip to Post 14 in the thread
For academical purpose here follows my experience :
2F Block overbore 0.060" ( Toyota pistons and rings )
ARP conrod bolts
Delta 250S cam
SBC valve springs
Dyno graph - Efi engine with stock compression ratio ( aftermarket ecu )
As you can see the engine power was still climbing when the tuner stopped the run .
In comparison : The carbed engine with higher compression ratio ( 3F carb head with kidney shape chambers and 9,5:1 CR )
I find it strange that the Torque of the carbed engine shows it to be higher at 2000 rpm than with the Fuel injection - when I drive it , it "feels" like there power at lower revs with the new Fi . Strictly speaking the graph of the carbed engine looks like it performs better than the Fi-engine . It was done on two different dyno machines , two years apart .
If fuel consumption is lower with Fi then I regard the process as a success - if not ... well I enjoyed the research and development .
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