North American Turbocoupe Organization

i was driving my 88 tc and noticed the boost gauge was at 11 or so psi. i filled it up with premium and flipped the switch, i then was building 10 psi. something wrong with the turbo or is just a dumb ford gauge. ??????

the stock boost gauge isn't that acurate

Do you have the stock BCS system yet? If so, the solenoid may not be working correctly or the orifices in the compressor T are plugged.

can you elaborate a little more. does the switch make a noticeable difference when driving. what is a BCS system? what is a "orifices in the compressor T are plugged"??????. thanks for the help and input.

BCS = boost control system
premium fuel switch
orfice

Insert some of these terms here and much will be revealed;
http://natomessageboard.com/cgi-bin/ulti...9;t=000165

With the switch in premium, the boost is upped to about 15 psi (IIRC) and the timing adjusted by about 4*. I think the normal mode of the switch is 10 lbs of boost and regular timing.

I would say it is most likely that your gauge is off. I'd get a good boost gauge to test, and then install it. Or just get a reliable gauge and install it, period.

There should be a pretty big difference in performance between the reg and prem settings due to the 5 more psi boost allowed in the prem position (roughly 35 more HP in the prem position). Be aware that the stock BCS system only allows max boost (about 15 psi) over 4500 RPM in all gears (later build 88), and only in 1st and 2nd gears over 4500 RPM in 87 and very early build 88.

The best thing you can do for your car is dump the entire stock BCS system and get a Gillis type pressure relief valve to control max boost.

ok thanks guys.

I'm guessing you still have the stock BCS.. Look under the hood on the front of the passenger side fenderwell. There should be a black cylinder with some hoses and wires coming off it. That is the BCS.

These are cheapies not known for longevity. What Jeff K said - dump it.