is it surge? my gauge flutters when surging also. is it manual or electronic gauge?

 

Manual transmission, It's OBS so my turbo(stock for now) doesn't surge. It starts fluttering as soon as the needle lifts off the peg. Obviously its from the intake valves opening and closing causing pulses.

My '94 did it with a 35 psi gauge, but went a way with a 60 psi gauge, and the gauge in my '97 is a 60 psi also. I know the fitting in the inlet of the 60 psi gauges is a very small orifice on both gauges.

-Michael

 

I would try a small orfice as far away from the gauge as you can.

Tom

 

That is kinda what I was thinking, were would I get such a thing to work for my set up? And what size orifice?

My gauge is tapped into my MAP line going to the sensor with a brass 1/8" NPT "T", it has 1/8" barbbed fittings to connect the line, and the compression fitting perpendicular to them. I have 1/8" plastic hose running to the gauge, I can get pics if need be/

-Michael

 

I did it by soldering a brass fitting shut and then drilling a hole throught the solder with a tiny number bit. Isspro also sells those orfice fittings.

Tom

 

You need to move the boost fitting from the map line to the spyder or splitter on your truck. Put it there and the flutter will decrease.

 

mine is there and it still flutters ALOT ?!?!

 

a easy way to get rid of flutter or at least cut down on it if you have enough boost line is just to make a small loop in line and it will significantly cut down on flutter. This is done in almost all semis that come factory equipped with boost gauges and works really well.

 

I've got multiple loops in the line already because it came rolled up and didn't want to straighten up.

I'll try the solder approach when I get a chance.

-Michael

 

Yeah, I thought the flutter was from the intake valves opening and closing, so you would want the boost gauge source farther away from them. The orifice it to dampen the pulsasions.

-Michael

 

You can use an ISSPRO #R7800, which is a 0.010" orfice in a brass housing with 1/8" NPT male and female ends. I would install it on the "engine" side.

Regards,
Michael Pliska

 

Yeah, I saw a "boost/fuel gauge flutter kit" in the DPPI catalog yesterday. So I'm gonna try that.

-Michael

 

autometer also sells a pressure snubber that will kill the flutter. I also had a bad problem with flutter until I put the snubber in line to the gauge. I have the part number saved around here somewhere.

 

Just FYI a .050" snubber helped significantly, but wasn't enough to completely kill it at high RPM. I bought some of those snubbers and they didn't turn out as small as I though. I know the restriction will screw out of the fitting, so I might look for a smaller one to replace it or just order another smaller one. The only autometer one I found(3279) was 1/8" NPT to -4 AN male.

-Michael

 

it's made by chemquip products inc. 201-868-4445/6

material: stainless steel
Size 1/8 NPT
Cat No. 12s
Porosity E