What up fellas, hows everybody boosting?
Just wanted to tell you guys to definitely look into a feul pressure gauge of some kind. I just installed mine, its glisceryne filled from earls with custom fittings. My pressure was set at 130-140psi when I started my car, gauge only read to 100psi. This is extremely high even for a boosted application, the highest turbo pressure I have seen is 57psi at idle. Anyways there was no way of me knowing that it was so high, except for maybe all the extra feul residue on my exhaust tip. My point is that when I adjusted the regulator down to 70psi, the unit is so precise that a millimeter of a turn meant 10psi in change, exagerating. But about a quarter of a turn brought me down to 70psi. This tells you that there is no way a mechanic or tuner can dial in the right amount of feul by geussing. Like on my install your techs probably raised the setting higher because running rich is better than running lean.
After a few days of cold starts and tuning I have mine set at around 60psi and it runs great. The first day it ran fine at 70 but in the morning it had trouble starting and maintaining idle. I expect a dramatic gas mileage increase. I was getting 22 mpg, I should get more now. Just an experience I had to share I recommend anyone boosting to get this gauge it was running good but in the future running that rich might have damaged my engine, especially because when you go full throttle the pressure increases. How high was it reaching if it was at 130psi at idle?
Another note, I got my new boost gauge and I am running 5.5 to 6.5 boost all the way through does this sound good considering my mods are supposed to lower the max boost?
ummmm your pressure was at 140PSI at IDLE?????? i'm confused.
shouldn't it be showing stock prelude pressures at idle, since
the jr afpr doesn't do anything until you hit bost?
Quote:
Originally posted by chomorro What up fellas, hows everybody boosting?
Just wanted to tell you guys to definitely look into a feul pressure gauge of some kind. I just installed mine, its glisceryne filled from earls with custom fittings. My pressure was set at 130-140psi when I started my car, gauge only read to 100psi. This is extremely high even for a boosted application, the highest turbo pressure I have seen is 57psi at idle. Anyways there was no way of me knowing that it was so high, except for maybe all the extra feul residue on my exhaust tip. My point is that when I adjusted the regulator down to 70psi, the unit is so precise that a millimeter of a turn meant 10psi in change, exagerating. But about a quarter of a turn brought me down to 70psi. This tells you that there is no way a mechanic or tuner can dial in the right amount of feul by geussing. Like on my install your techs probably raised the setting higher because running rich is better than running lean.
After a few days of cold starts and tuning I have mine set at around 60psi and it runs great. The first day it ran fine at 70 but in the morning it had trouble starting and maintaining idle. I expect a dramatic gas mileage increase. I was getting 22 mpg, I should get more now. Just an experience I had to share I recommend anyone boosting to get this gauge it was running good but in the future running that rich might have damaged my engine, especially because when you go full throttle the pressure increases. How high was it reaching if it was at 130psi at idle?
Another note, I got my new boost gauge and I am running 5.5 to 6.5 boost all the way through does this sound good considering my mods are supposed to lower the max boost?
That is my point, it was extremely high meaning when I boost it only gets higher. My pressure was at 140psi on idle when you get your gauge you will see what I mean.
The jrpr is still a regulator but idle feul pressure is controlled by a knob of some sort in the end of the feul rail which causes a regular idle on lots of pressure. Thats what JR said anyway, i was also wondering this.
my underhood shows pressures in the 40s... and i don't see any way to change it at idle!
how did the people who did your install up the pressure on your stock fpr? or via some other adjustment? why would they do that?
Quote:
Originally posted by chomorro That is my point, it was extremely high meaning when I boost it only gets higher. My pressure was at 140psi on idle when you get your gauge you will see what I mean.
The jrpr is still a regulator but idle feul pressure is controlled by a knob of some sort in the end of the feul rail which causes a regular idle on lots of pressure. Thats what JR said anyway, i was also wondering this.
How do you know it was at 30psi on idle? Do you already have a gauge?
My installer raised mine up because my car would shut off on full throttle around 6000rpm because of lack of feul. JR recommends that pressure to be at 60psi on idle, maybe you should up it a little. They said that 70psi is good but 60psi is better.
i have an underhood gauge, very large and very accurate, that i've used to check it at idle. i also picked up the normal autometer electrical cockpit gauge w/sender, but haven't put that in yet.
you may want to check with JR again, i think you've got something odd going on. if the engine is dying at full throttle under boost, you should be adjusting the JR AFPR, which would have NO effect on idle pressured!
the JR AFPR does NOTHING at all until you see boost. the engine should be running normally at this point, as if, for example, the AC was on. it's just a bit of drag. your stock FPR should be handling pressures at this point. once 1PSI of boost shows up, the JR AFPR starts raising the fuel pressure, based on the amount of boost. JR told me that the pressure at MAX BOOST should be 85 PSI. check your helms for the stock idle pressures, it's pretty clear.
Quote:
Originally posted by chomorro How do you know it was at 30psi on idle? Do you already have a gauge?
My installer raised mine up because my car would shut off on full throttle around 6000rpm because of lack of feul. JR recommends that pressure to be at 60psi on idle, maybe you should up it a little. They said that 70psi is good but 60psi is better.
Where is your gauge tapped into? Mine is tapped into the feul rail and reads 60psi at idle after racing for awhile it reads 40psi. First starting it reads 65psi. Maybe I am getting a different reading because of where mine is tapped in. Adjusting the pressure regulator does change the pressure in the rail so I know it can be changed at idle. The idle will still be the same though because of the pulse dampener at the end of the rail, but the pressure can be increased.
interesting. my gauge is tapped into the fuel line between the fuel rail and the fuel filter with a tee fitting. i didn't see how an adapter nut could fit under the shorter sc drive belt (which is like 1" above the sealing nut on the fuel rail.)
adjusting which regulator affects your idle pressure? the stock regulator is not adjustable, and the jr afpr does not affect idle... or so they tell me. do you have an adjustable fpr on your fuel rail?
Quote:
Originally posted by chomorro Where is your gauge tapped into? Mine is tapped into the feul rail and reads 60psi at idle after racing for awhile it reads 40psi. First starting it reads 65psi. Maybe I am getting a different reading because of where mine is tapped in. Adjusting the pressure regulator does change the pressure in the rail so I know it can be changed at idle. The idle will still be the same though because of the pulse dampener at the end of the rail, but the pressure can be increased.
Your right about the fitting on the feul rail. I had to have mine custom installed with a 7inch steel braided hose from the feul rail to my gauge. Its a sweet setup where I can look at it while starting the car and everything. You just drill out the existing bolt on the rail and fit in some earls fittings. Takes awhile to get all the right parts but its more accurate and looks better.
My idle pressure is adjustable from the jrpr, maybe I have the wrong setup.
well, that's really wierd. i have adjusted the jr fmu about 4 full turns, to see what it did, moving the baseline all the way from 60-100+psi, and the idle was still at 50psi either way. very odd. if you had a problem with the vacuum line leading to the jr fmu, you might see it affecting your "idle." i dunno!
Quote:
Originally posted by chomorro Your right about the fitting on the feul rail. I had to have mine custom installed with a 7inch steel braided hose from the feul rail to my gauge. Its a sweet setup where I can look at it while starting the car and everything. You just drill out the existing bolt on the rail and fit in some earls fittings. Takes awhile to get all the right parts but its more accurate and looks better.
My idle pressure is adjustable from the jrpr, maybe I have the wrong setup.
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I recommend anyone boosting to get this gauge it was running good but in the future running that rich might have damaged my engine, especially because when you go full throttle the pressure increases. How high was it reaching if it was at 130psi at idle?
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