boost install

[swampthang]

ok guys i got a question for ya i have a non intercooled cummins 91.5 and i need to install my boost guage i read on here in a link that you have to drill and tap a hole to get a boost read now on the intercooled trucks like my 93 i just pulled the lil plug right behind the fuel lines behind the bracket and hooked it up there this non intercooled truck has the same plug why can i not use it on the non ic truck i dont see any reason


JC

[bgilbert]

You just drill a hole in the throttle bracket big enough to get your socket over the brass fittings for the boost tubing hook up. You are right, the 1/8npt tapped plug is in the same place be it intercooled or non-intercooled motor.

[swampthang]

cool thanks i guess will ad that to my list tomarow too lol


JC

[swampthang]

umm ok well i installed the guage today on the lil port on the side of the intake only prob is no boost showing on the guage checked the line no kinks ?? i un did the line from the guage and there is no air blowing threw it when the engine is running shouldent there be ?? any ideas it is new lines new nuts new farrels same guage i used before

JC

[90firstgen]

Sounds like the ferrel pinched the line shut.

[swampthang]

it did the first time went on sideways but i redid it i guess i will have to check it again on the motor side ??

JC

[90firstgen]

guess i will have to check it again on the motor side ??

JC

Yes sir. Make sure and cut off the parts that have been pinched too.

[Cschafer]

You shouldnt be able to feel any air coming out of the hole, I'm assuming that if your hand was on it you wernt driving it, the truck won't make any boost unless you driving it. If it's stock it wont make much boost untill you floor it up a hill.

[swampthang]

ya i got it working it pegs my 30 psi guage on a hard pull runs about 15-20 crusing down the interstate now i just have to get a new pyro probe for my temp guage any ideas where to get one ??? i have the isspro guages


JC

[90firstgen]

15-20 is pretty dern high. Make sure your wheels aren't locked up

[SChandler]

If you need a replacement probe for an Isspro gauge, you can order one from Isspro directly (as you can with any of there gauges and accessories) at http://www.isspro.com. You can also order the replacement probe from pretty much any place that sells Isspro gauges.

[swampthang]

15-20 is pretty dern high. Make sure your wheels aren't locked up


lol ya i was suprised running about 70 75 down the interstate just crusing not pulling a hill or anything 15-20 psi constant put a load on the engine and we peg the 30 psi guage makes me happy now i just got to get an ic in it to cool it down lol




you need a replacement probe for an Isspro gauge, you can order one from Isspro directly (as you can with any of there gauges and accessories) at www.isspro.com. You can also order the replacement probe from pretty much any place that sells Isspro gauges.


thanks i will look into it



JC

[dpuckett]

How fast were you going, and what gears do you have? Going 80-85 with 4.10s will get you 15-20psi at crusie.

Be sure to put the probe in the manifold. It is easy to drill and tap. Just need a little grease. The manifold is soft enough I use Vice Grips on the tap, and have had no problems.

DP

[swampthang]

doing 70-75 i have 3.54 and i am running 285-75-16 bfg mud terrains spining about 2k on the tach

as for the pyro prob the old one i have mounted in the down pipe with a clamp ?? what is wrong with that style mount ?


JC

[SChandler]

With the temp probe in the manifold, you get better (more accurate) temp readings. By the time the exhaust reaches the downpipe, it has gone through the exhaust manifold, turbine housing, and started down the downpipe, shedding heat the whole way, leaving the temp reading at the downpipe more inconsistent than the reading at the manifold. At idle or other low load situations the difference between manifold and downpipe measurements might be 100* (with the lower temp being read at the downpipe). But under full throttle banzai runs, the temp difference has been shown to be between 300-500*(from magazine results and other parties curious enough to run two pyrometers). Thus, the measurement of 800-900* at the downpipe could be a piston-melting 1400* at the manifold (and even higher in the cylinder) or it might only be 1200* at the manifold, which you can run all day long (according to various sources who quote Cummins literature).