Fueling & Injection Fuel Pumps | Injectors | Rails | Regulators | Tanks

Vacuum modulated FP or static?

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Old Dec 27, 2006 | 10:06 AM
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Default Vacuum modulated FP or static?

quick question.

current stock system is vacuum modulated.
at idle and low cruz pressure is 42-43. then climbs to 48-49 at wot via vacuum (map to regulator)

i pulled the vacuum line off the regulator and pressure goes static. solid 50lbs.
and at wot 6300rpm it still shows 49+ - 50.

would there be any disadvantages to leaving it static at 50lb?

(02 v6 fbody with walbro intank)
(hptuners so retuning trims is no biggy)

thanks

Last edited by usd2sing; Dec 27, 2006 at 10:18 AM.
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Old Dec 27, 2006 | 12:33 PM
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Originally Posted by usd2sing
quick question.

current stock system is vacuum modulated.
at idle and low cruz pressure is 42-43. then climbs to 48-49 at wot via vacuum (map to regulator)

i pulled the vacuum line off the regulator and pressure goes static. solid 50lbs.
and at wot 6300rpm it still shows 49+ - 50.

would there be any disadvantages to leaving it static at 50lb?

(02 v6 fbody with walbro intank)
(hptuners so retuning trims is no biggy)

thanks
That car needs a LT1 style dry kit soo bad I can taste. It will waste the 2 kits you have on it now for sure with one jet.
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Old Dec 27, 2006 | 12:37 PM
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^^^^^

good one bro.

couple of more weeks and i'll be heading your way. gauranteed!

Last edited by usd2sing; Dec 27, 2006 at 02:09 PM.
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Old Dec 28, 2006 | 01:43 PM
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Originally Posted by usd2sing
^^^^^

good one bro.

couple of more weeks and i'll be heading your way. gauranteed!
David bring you your driveshaft yet?

You still needing that S pipe made?
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Old Dec 28, 2006 | 02:35 PM
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nope on ds...grrrrrr. just kidding.

made an s pipe in the garage, but i do have some other stuff that i would like to have you handle. just need a couple of weeks to clean up my $$ situation.

got any input on whether or not i should just leave the fp static at 50?
i have a used vortech 50/70 inline that im considering adding to the system to help out.
after reading your comments on the inline pump installs your the man for the job...hehehehe
i'll get with ya as soon as my bank clears my funds....stupid BofA..
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Old Dec 29, 2006 | 07:42 AM
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Originally Posted by usd2sing
nope on ds...grrrrrr. just kidding.

made an s pipe in the garage, but i do have some other stuff that i would like to have you handle. just need a couple of weeks to clean up my $$ situation.

got any input on whether or not i should just leave the fp static at 50?
i have a used vortech 50/70 inline that im considering adding to the system to help out.
after reading your comments on the inline pump installs your the man for the job...hehehehe
i'll get with ya as soon as my bank clears my funds....stupid BofA..
I would leave the vacuum hooked up to the regulator..Or if you want unplug it and tune for that. Then hook the line back up for fuel economy if you drive it around. Thats how I did mine. Im not a fan of Boost A Pumps. Either you got enough pump in the tank or you dont. I like the racetronix setups with the hot wire kit. I dont bother with dual intank pumps. I go straight to an external setup from there.
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Old Dec 29, 2006 | 08:58 AM
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thanks bro. thats the kind of input i am looking for.
new walbro intank that works fine.
im on my 3rd injector swap in a month.
looks like im just gonna throw in the towel and find some 60lb'ers and be done with it.

btw. met david yesterday, got the DS. kewl!
really would like to see his ride at the track. sounds impressive.

thanks again,
dan
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Old Dec 29, 2006 | 11:33 AM
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Originally Posted by usd2sing
thanks bro. thats the kind of input i am looking for.
new walbro intank that works fine.
im on my 3rd injector swap in a month.
looks like im just gonna throw in the towel and find some 60lb'ers and be done with it.

btw. met david yesterday, got the DS. kewl!
really would like to see his ride at the track. sounds impressive.

thanks again,
dan
Its a very mild setup that makes great average power. should be interesting with some slicks and a decent raceweight. I know that combo was on the car before so back then weight wasnt taken into consideration when the heads/cam setup was purchased.

But nonetheless, Stage 1 heads with that small cam, its makes killer average power. We will have new numbers here soon in the next 2 weeks or so.
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Old Dec 29, 2006 | 11:36 AM
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kewl. post up or whatever. i would like to see it and actually meet ya..hahaha

btw, got and 42#'ers laying around. im in need of 6..
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Old Dec 29, 2006 | 12:39 PM
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Originally Posted by usd2sing
kewl. post up or whatever. i would like to see it and actually meet ya..hahaha

btw, got and 42#'ers laying around. im in need of 6..
yes i do actually but im not selling 6...only 8. $200.00 2K on them. Bosch/SVO injectors.
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Old Dec 29, 2006 | 12:42 PM
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that would be awesome. sending pm

thanks.
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