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don't replace pump unless you KNOW fuel pressure.
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Posted by JohnB (more from JohnB) on Wed, 24 Jan 2007 13:52:03 Share Post by Email
In Reply to: Boost and fuel issues with my T16S/SPG...please help!, VinceCJ, Wed, 24 Jan 2007 12:48:28
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you'll need to drill and tap for 1/8" NPT into the banjo bolt at the end of the fuel rail for an electrical sending unit for a Stewart-Warner electric fuel pressure gauge. I got mine from the old SPG9 people when I bought a FPR but they're no longer so you'll have to do it yourself. buy the tap. Maybe $5. remove the banjo bolt first!!!

THEN you'll know exactly what's happening.

If you're getting a face-in-the-dashboard type of fuel cut under hard boost, it's not the fuel pump. It's the pressure cutout switch. Saves engine but clearly set too low...just go in through the speaker hole and screw the adjustment screw in maybe one turn at first. You want to be able to go boost to the end øf the red without fuel cut.

One thing...the fuel pressure gauge will ensure you know what pressure you're getting at the higher boost levels but won't tell you if you're getting enough fuel. The stock injectors will probably flow enough at 15-17 psi boost with a 3.0 or 3.3 bar regulator but it's hard to tell without an oxygen sensor or wideband oxygen sensor. Alternatively, you can remove a plug and check for color at the bottom of the insulator...way down in there, NOT the tip. What you're looking for is a relatively darker ring of color at the bottom and NO specks of aluminum or whatnot on the tip of the insulator around the metal electrode and down the sides, maybe 1/8 inch or so. Specks of aluminum are a bad thing...indicative of detonation and deposit of piston metal! Hole in piston to follow if you keep it up.

Sometimes the ?etonation is just too hot of a plug...I like NGKs (BPR7ES? or somesuch currently, the iridium ones but lots of people do as well with the EV ?palladium tip? ones. I always have to look up the numbers but there you are. If a colder plug won't do it then you'll just have to feed the puppy...bigger injectors or a higher fuel pressure. And then you're back to the gauge to make darn sure you have (in my case right now it's 55psi at 18psi boost with 32psi base/idle fuel pressure and a slight pressure bleed at the regulator at full boost to lean it out using a rrfpr from SPG9. Still runs slightly rich at wot but I'm not willing to lean it out any more...runs tight during winter!!




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