Throttle body injection help

**outasite** · 11-25-2015, 09:16 PM

Putting together a motor for my Switzer ss.Its kinda more or less a pro max 225 copy.Couple of things I'm not sure of, Are the throttle body bores all the same size,and the one I have has "progressive butterfly's" one set opens first.I guess what I'm asking is what is the difference between a 150 and a 225 throttle body.I have the correct seven petal front.Also are the air boxes all the same?

**TEXAS20225** · 11-26-2015, 02:43 AM

no sir they are all identical except for the ones that were on the very first efi 2.4 they had butterflys that both opened at same time

some of these newbies swore they had the deal of a century but ive not found any super deal with the very old first attempts stuff if it was all that it would not have changed" air box" as in yer carbing the lil fellow awh too bad

**tlwjkw** · 11-26-2015, 06:32 AM

Originally Posted by TEXAS20225

"air box" as in yer carbing the lil fellow awh too bad

don't fret bud... maybe he's referin' to tha "plenums".....

**outasite** · 11-26-2015, 08:10 AM

"The air box" Is what I'm calling the cover that seals over the top of the injection body,makes it airtight.

**tlwjkw** · 11-26-2015, 08:47 AM

that will make 'em (bobby) feel better....has he ever mentioned how much he dislikes CARBURETORS! Ha!

**Dave Strong** · 11-26-2015, 12:11 PM

Years back there were a couple places that would bore the throttle plates and install larger butterfly's. Not sure if they worked any better.

Dave

**outasite** · 11-26-2015, 01:32 PM

Thanks Dave,I'll be happy to get it turn key,and make noise.This is my first venture into TB injection.

**Dave Strong** · 11-26-2015, 01:51 PM

If your going to play with Laser EFI get the TPS adjusting tool they are cheap and best way to adjust the TPS.

Dave

**texasvector** · 11-26-2015, 01:52 PM

It's only called an air box if u drilling holes in the front and add carb butterflies

**outasite** · 11-26-2015, 02:02 PM

Dave,will be using a Brucato PCU,Texas,sometimes it where ya come from that determines what ya call sumpin.Jacki Wilson,may call it a bonnet of sorts! Anyway that damm thing that bolts to the front and makes the air come in from the rear.