GrimGreg Posted July 29, 2005 Share Posted July 29, 2005 Anyone know of one available for our throttle bodies? Link to comment Share on other sites More sharing options...
RedPath88 Posted July 30, 2005 Share Posted July 30, 2005 88 has one on his TBI engine... 88, you refer to it as "custom" did you make it? How much of an effect did it have on your engines performance? Link to comment Share on other sites More sharing options...
88pathoffroad Posted July 30, 2005 Share Posted July 30, 2005 So far I notice no difference in power or gas mileage. I made it out of a $1.99 3/8" thick polyethylene cutting board, using the stock mixture heater as a pattern and using a Dremel with a Roto-Zip bit to cut the PE. I cut two pieces, for 3/4" of spacer and gasketed between each piece. I had to buy new studs and damn, they're kinda expensive, like $3 each or so. Here's a pic. Link to comment Share on other sites More sharing options...
hardwaretoad Posted July 31, 2005 Share Posted July 31, 2005 (edited) So, other than an additional 2 possible leak-points, what's the advantage? Curious peeps want to know... BTW, congrats on getting your forum back up... :type: Edited July 31, 2005 by hardwaretoad Link to comment Share on other sites More sharing options...
88pathoffroad Posted August 1, 2005 Share Posted August 1, 2005 The theoretical advantage is to space the TBI higher off the intake to gain better fuel/air mixture for all cylinders. As it sits stock, the F/A mix leans out the cylinders on the passenger's side until you hit about 75% open throttle due to the orientation of the throttle plate. *shrug* Link to comment Share on other sites More sharing options...
Precise1 Posted August 1, 2005 Share Posted August 1, 2005 Hmm, makes sense... Sounds like a good reason not to buy one of them there 2 door thingamagiggies... :o B Link to comment Share on other sites More sharing options...
transworldmoto Posted August 2, 2005 Share Posted August 2, 2005 where did you get the materials? i would like to do this to my tbi, since i just bought a whole new tbi unit off a 1989 with 40k on it. can you tell me what you used for the studs too? Link to comment Share on other sites More sharing options...
88pathoffroad Posted August 2, 2005 Share Posted August 2, 2005 A $3 white polyethlene cutting board, and longer studs. Link to comment Share on other sites More sharing options...
transworldmoto Posted August 2, 2005 Share Posted August 2, 2005 sweet! off to the hardware store! Link to comment Share on other sites More sharing options...
transworldmoto Posted August 2, 2005 Share Posted August 2, 2005 and that 3/4" of lift on your tbi didnt effect the bolting of the "air box" to the valve cover? or did you have to get longer bolts for that one too? :confused: Link to comment Share on other sites More sharing options...
88pathoffroad Posted August 3, 2005 Share Posted August 3, 2005 Shoot, I trimmed off that tab long ago. Now all I have to do is take off the wingnuts and the air cleaner comes right off. Link to comment Share on other sites More sharing options...
mws Posted August 4, 2005 Share Posted August 4, 2005 Hey Aaron - Love seeing the real world feedback. A couple of the TBI spacer marketers are now offering versions with the separator between the bores partially eliminated in an aerodynamic looking way. The claim is that this improves balancing between cylinders at low rpm and improves peak power at higher rpm as each cylinder can draw from both bores of the TB. That theory and $5 will get you a cup of coffee at Starbucks... But, then again, that theory also sounds an awful lot like the old Yamaha V-Boost system on the V-Max. On that engine, it worked and made a huge difference as the bores were undersize for the displacement - so letting cylinders breathe thru two bores eliminated a major restriction. I wonder if the bore diameter in the TBI present a power limiter to these engines at high RPM? Are the bores separate or joined in your plates? Have you tried the other option? Wanna be our guinnea pig? Link to comment Share on other sites More sharing options...
88pathoffroad Posted August 4, 2005 Share Posted August 4, 2005 Hey, that's not a half-bad idea. I could make one like that and put it in there. Dunno when I'll have the time, though. My spacers just have a single bore, all the same size. I bolted the raw PE plates to the mixture heater and then cut them to fit that way so they're all the exact same. Link to comment Share on other sites More sharing options...
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