I was curious so I checked what my Aeromotive AFPR was set to...

[bmoha2]

It was set to 60psi when I removed the vacuum line!!! Holy mother of fuel! No wonder my mpg has been sucking! I thought I had set it to 38.3 approx with the vacuum line off. Maybe I did it wrong but it is a very simple system. Weird thing is at 60psi it was running great, it running great at 38.3 psi as well. I have a walbro 190 lph pump, super simple modified vacuum system, egr eliminated including egr blockoff plate. By ear, it seems to be running flawlessly now. Like butter. My ear isn't a precision measuring system tho. I am going to be saving money towards dsm link etc as soon as possible. I am still running the stock 450 cc injectors and don't go over 17psi of boost as it sits now. That 60 psi was at idle with the car fully warmed up.

 

[romeen]

I'm surprised the car even ran well at 60 psi.

Base fuel pressure in a 2G is 43 psi (43.5 to be exact), not 38. You may be running lean under boost. Do you have a logger to see if you are knocking?

 

[chavez408]

Oh man, did you lower it?

 

[bmoha2]

Now I have been getting some conflicting information here. When I had installed the Aeromotive AFPR I looked up information to my hearts content and 43.5 was the base pressure I came up with. Later on I found another thread saying that a 2G should be set to 38.3 with the vacuum source detached.

 

[Supa Dexta]

Nope, 37 for a 1g, 43.5 2g is correct. Vac line removed.

 

[bmoha2]

I will reset it this am before going to work

 

[herblove]

I have question. 1g is suppose to be sat at 37psi and 2g at 43.5 right. What about if you have a 1g and are running the 2g compression (8.5:1) do you still use the 1g fuel rate of 37 psi w/vac line detach. I mean why are the psi different in the 1g vs 2g?????

 

[tkelly27]

The computer you use sets it, not the engine. If you are using a 1g computer, use 37.

 

[bmoha2]

I usually get 160 to 180 mp tankful. I'm at 180 miles now and only 3/4 on the way thru this tankful! Would it be prudent to expect a third better gas mileage since my fuel pressure was set a third too high? Ah well... Holy schmoley! The car is really running nicely. I don't think it has ever run this good! Smooth even power production. No stuttering. Seems like i may have to reset the idle now but that's ok.

 

[tkelly27]

Not exactly a third. You were running those injectors at 530cc when pushing them to 60psi RC Fuel Injection
(or maybe 570 if the 450cc rating is from 37psi)

Either way 1/3rd of 440 is 147. You do have a happier car, and that is the important part!

 

[bmoha2]

I just finished that tank of gas and finished up at a whopping 219.4 miles for that tank! The tank before that stopped at 160 miles! That is the best this car has done in years in around town driving!!! And I reset the AFPR to the correct psi halfway thru that tank! I'm hoping to see 240 out of this current tank!

 

[turboglenn]

Great news about your mileage!!! I can never do any better than 180 per tank in the city./. equalling about 16 MPG On the highway i do much better, but i've been working on my tune with the closed loop turned off so it has to make less corrections ( i have to do this everytime i make amajor change) and I've gotten to where i get the same miles per gallon with teh cams as i was getting before them. But trying to get at least 20mpg is getting harder and harder for some reason....

I guess i whould look before asking your mods, but is there anything done that's not in your profile?>

 

[bmoha2]

HKS cams I had them installed years and years ago at this shop called hyperformance in Milwaukee WI. I'm not sure if they are still around or not. I think they were 264 degree cams? Maybe 268degree? I forget. I remember they were very expensive. It's been a long time and memory not so good. Maybe 8 or 9 years ago. I was doing a lot of street racing back then and I wanted a cam for the 0-60mph torque and bottom end. I got them specifically for a lot of grunt from the low end. Back then I was spending every Friday and Saturday night at highway 100 in Milwaukee racing like a fiend. I also have AEM adjustable cam gears but both are set to zero. I gotta look thru my profile and edit it.

 

[bmoha2]

Driving it like I normally do, which is like I stole it all around town mileage!!!

 

[Rob10_99]

Im about the same, BC272's and huge 950cc injectors and I drive 80miles or so everyday.
Im hard pressed to get more than 210 out of a tank.

 

[bmoha2]

and I was getting 160-180 per tank! 235.5 Rocks!!!