To ITB or not to ITB...that is the question...

[john.p.clegg]

Dear All

Am getting on well with the Twinc EFI'ing,having used GPZ 750T throttle bodies and running Alpha-n and now am thinking of Phase 2...what are the pro's and con's of going to a single throttle body...I have not found it easy to balance the ITBs,especially at low openings,where a lot of my cruising is,surely one butterfly will produce much more equal airflow than Individual ones,which will help balance the mixture,giving better MPG and better Power at lower throttle positions?

Your thoughts welcome..
Thanks

John

[devastator]

A single TB should give you more control at lower throttle openings as you suggest. It will also give you a more stable MAP signal which might open up a whole new availability of tuning options for you.

surely one butterfly will produce much more equal airflow than Individual ones,which will help balance the mixture,giving better MPG and better Power at lower throttle positions?

The equal air flow will smooth out your MAP signal, compared to the ITB's, but AFR is AFR, so you might not notice much improvement in MPG and/or power at any range.

[john.p.clegg]

Devastator
Many thanks but, "a whole new availability of tuning options " apart from changing back to SD from Alpha-N? what could these options be?
Thanks
John

[devastator]

With SD:
You will be able to use the MAP based accel in combination with the TPS based accel. X-Tau is available, (not sure if that is available with Alpha-N). You'll be able to have your engine running happy AFR's at different altitudes. You'll also be able to dial in the AFR more accurately as you are measuring, (not approximating), the amount of air actually entering the engine. If you decide to add a turbo someday, SD is recommended over Alpha-N.
That's all I can think of off the top of my head, but there may be others.

[john.p.clegg]

Once again,many thanks

John