This may sound stupid but an Idea I just had was. Could you put a washer or two under the spring In the pressure regulator of our TBI's. Would this afectivley increase pressure? Would like to see If anyone else thinks it will work before I actually try It.
(already have factory screw for adjustment pegged)

 

not gona do to much, if you already got it adjustable. if you really want to skyrocket pressure, make a plate and block it off completely. and then get an external regulator. why do you need your fp higher? you would need many mods to need any huge adjustments. and if you have your pressure boosted max all the time you might as well just get larger injectors.

 

I already have 65 or 68 lb injectors. I have a 350 with the original 305 heads. Three angle job, ported . Slightly larger than stock cam. motor seems to be burning what I'm giving it now very well. I would just like to find the limit, then back it off So I know that im getting everything I can out of the motor. But I was just wondering about the washer trick. Any other mods you got would be appreciated though.
joel P

 

Yeah you can. The 9C1 list has been doing this to TBI cars for at least a year. It's affectionately known as "the quarter mod", since the first guy to do it actually used a quarter.

 

thanx W41 , how can I chek out this 9c1 list?
joel P

 

Joel, Its an email list on Yahoogroups.com. You have to subscribe. And expect a lot of mail, there are almost 600 members last time I looked. It's a very active list dedicated to Police Package Caprices. You should expect 75-100 emails a day from the list. If you can't deal with the volume I'd suggest using the digest version at first.

Most of the guys are the 91-96 owners. But there are some guys with older cars like me and my 89.

There is also a splinter group from that list dedicated to just TBI cars. Yahoogroups.com again and GM_TBI is the group.