I'm thinking of shimming my stock fuel pressure regulator with the old coin trick, for a bit more pressure (46 psi currently). I figure a nickel or dime under the cover will add a few psi. Or if all esle fails a Swedish Kronor, which is about as thick as a nickel and dime. Skoll!

I'm too cheap to spring for an adjustable regulator if I can do the same thing fwith a dime.

I do plan to raise the injector constant in my chip to compensate for the added pressure/flow. I'm seeing around 880 mv in third and 900 mv plus in 4th so the AF is in the ballpark, but my injectors are running static much of the time. I need more pressure, so I can knock down the duty cycle a bit and open up some more tuning options.

First, I gotta pick up an appropritate tool to pull the cover. The fasteners are a small torx head with a central pin. Looks to be about a T-8. Anyone know the size, before I go shopping?

Thanks

Update: Ok, they're called Security Torx bits and sears has a set that goes down to T-10, upon closer inspection, It looks like a T-10 on the regulator. I'll post back with my pressure vs. coins results.

 

I believe it's a T-10, but could possibly be a T-15. If you want to wait for me to get home, I'll double check.

If you haven't already, I'd recommend buying the torx bit set from Sears - it comes in handy.

 

Buy the set from sears it will work perfect on fuel pressure regulator. That's what I used when I changed diaphragm on mine.

 

If you don't want to go to Sears, you can knock that pin right out. I used a small screw driver to bend the pin over, then the other way, and it broke off nicely.

 

get the right bits... those screws are hard to replace...

I tried.

Autozone sells a 4-bit kit that has the right E torx (E6-E9) for about 10.00, if I remember rightly.

 

http://forums.corvetteforum.com/show....php?t=1391445

 

Update: Its a security torx T-10.

With a nickel added under the lid (no vacuum): 54 psi
Previously (no vacuum): 46 psi

$.05 well spent.

Thanks, just need to lean out my chip a bit.