Need to learn about boost reference fuel pressure regulator.
Thread Starter
Joined: Nov 2001
Posts: 10,813
Likes: 15
From: Doylestown PA
Need to learn about boost reference fuel pressure regulator. Well I did a search and came up empty.
Right now I have Lonnie's double in tank setup with a hobb's switch activating the second pump at ~4lbs of boost. I have Speed inc fuel rails, and other than that, a stock fuel system.
So how difficult/easy is it to go to a boost reference fuel pressure regulator?
Right now I have Lonnie's double in tank setup with a hobb's switch activating the second pump at ~4lbs of boost. I have Speed inc fuel rails, and other than that, a stock fuel system.
So how difficult/easy is it to go to a boost reference fuel pressure regulator?
It is very easy.
Set your fuel pressure with the car idling, vacuum line disconnected.
Then connect vacuum line.
Adjust your injector flow tables for boost reference, which sets the flow table to the same number across the board, since the regulator now adjusts to compensate.
Under boost you will now be rich as the additional fuel pressure will increase flow.
Set your fuel pressure with the car idling, vacuum line disconnected.
Then connect vacuum line.
Adjust your injector flow tables for boost reference, which sets the flow table to the same number across the board, since the regulator now adjusts to compensate.
Under boost you will now be rich as the additional fuel pressure will increase flow.
Thread Starter
Joined: Nov 2001
Posts: 10,813
Likes: 15
From: Doylestown PA
I wish I had known this when I put the double pump kit in from Lonnie. I would have gone to the boost referenced regulator at the time.
Another lesson learned after the fact.
Another lesson learned after the fact.
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Thread Starter
Joined: Nov 2001
Posts: 10,813
Likes: 15
From: Doylestown PA
This is still something I need to do. My to-do list just keeps growing, I wish I had more time in the day to get things done. Maybe over the winter when I don't have yard work to do I'll be able to drop the tank again, remove the factory regulator and pick up a boost referenced one.
Lonnie, I haven't called because I've just been too busy. I don't think I have 200 miles on the new motor since finishing it on July 1.
Lonnie, I haven't called because I've just been too busy. I don't think I have 200 miles on the new motor since finishing it on July 1.
Whenever you are ready let me know.... I know all about a lack of free time.
As for "needing one", you typically do not under 650-700rwhp.
Once you exceed this power level the factory regulator does not control the pressure that well. At this time it is best to locate the regulator at the front of the car with a return line. Then you can boost reference it & help out with your injector flow at high boost levels.
Once you exceed this power level the factory regulator does not control the pressure that well. At this time it is best to locate the regulator at the front of the car with a return line. Then you can boost reference it & help out with your injector flow at high boost levels.
ah, thats what i thought originally, but wasnt sure. think i might have this as a side project once i get the run full up and running with the turbo for my modest 500hp starting goal.
Thread Starter
Joined: Nov 2001
Posts: 10,813
Likes: 15
From: Doylestown PA
So what do people typically use as a return line? Do they run a new supply line, then use the factory supply line as the return? What about the second fuel line that runs to the engine bay? What's that used for?
10 Second Club
Joined: Jul 2011
Posts: 176
Likes: 1
From: Seattle
You can use the evap line, but personally I would rather leave the EVAP system intact. I think it is easier to run a new line 10' than to reconfigure the evap system.
forgot all about this one lol ive since set up my car to run a BR FPR, just havent sent fuel through it yet lol
Heres a few pics on how i ran mine.
6 AN Male To 14mm x 1.5 O-Ring plug for the t-block and a 6an cap of course.
6AN Male To 5/16" Quick Disconnect Male Fuel Fitting to hook up to the stock plastic fuel line in the back. its in the baggy if you cant see it lol
just to make sure though, i still hook it up to the brake booster hose right for the vac/boost source? just making sure
Heres a few pics on how i ran mine.
6 AN Male To 14mm x 1.5 O-Ring plug for the t-block and a 6an cap of course.
6AN Male To 5/16" Quick Disconnect Male Fuel Fitting to hook up to the stock plastic fuel line in the back. its in the baggy if you cant see it lol
just to make sure though, i still hook it up to the brake booster hose right for the vac/boost source? just making sure
quick question on this, where do you hook it up at when i start using it with boost? i hear alot of back an forth on before or after the throttle body... if its hooked up to the vacuum its possible that the fuel pressure can drop. my question on this is, if the fuel pressure is set with out boost in idle vac at 58psi and is ment to keep the pressure set at 58ps, how when in boost is it possible for the fuel pressure able to drop even below the set 58psi idling vac condition?
if its just hooked up to boost,ie before TB, its doing this anyway right?
just want to make sure i hook it up right
if its just hooked up to boost,ie before TB, its doing this anyway right?
just want to make sure i hook it up right
I believe the Hobbes switch only comes on when in boost, vacuum does not affect it one way or the other. When the Hobbes switch senses boost, say 5psi, it acts as a relay to turn on the true relay connected to the second pump. Otherwise, you function as you normally would on one pump when not in boost. Sort of an on-demand system. Only on when needed. Doesn't affect the other pump or rail pressure when not used.