24-04-02, 11:26 AM
does anyone know if you can mod your ECU to "think" that your manual transmission, is an automatic.
this would make the turbo kick in sooner, no?
if this is possible, could you hook it up to a switch, you know like race ECU mode and going to the market ECU mode?
just a thought
ECU has nowt to do with the turbo spooling up....
24-04-02, 01:57 PM
i wasn't sure, you gotta watch who you talk to right?
is it true that the turbo will spool up sooner on an auto than a manual?
if so, what causes this and can it be controled?
24-04-02, 04:36 PM
There's no relation between transmission type and turbo spool-up...
Because of its longer gear ratios the Turbo Automatic usually spools up much slower than the manual version. Turbocharger requires certain rev- and load levels to be exceeded for boost to be produced.
This is because the compressor won't spin efficiently before the exhaust turbine has gained momentum by the exhaust gas.
I know i am debating with fairly knowledgable people here hawever hear me out.
I have experienced (owned) both 900t's in auto and manual. And in my experience boost response was better in the auto when off the mark.
This is because of the load that is placed on the engine by an auto transmission (torque converter) that is not presented by a manual.
The greater load the greater exhaust gas to turn the turbine.
Plus having owned both, i know first gear in both auto and manual aare good for very similar km/h therefor their gearing being quite similar for first gear.
I am similarly light on the knowledge front but I think it's the effect of the final drive ratio that stretches the three gears to enable the car to reach a decent top speed with three gears - a similar effect to having much larger wheels fitted ie: Higher top speed but slower acceleration. Don't know about spool up times as the only manual cars where I've really put the boot in have been modified