I just found this on the TDS web site and I was wondering if it was worth is. http://www.top-downsolutions.com/pro...24f6ced8bb34b7

 

i posted about it awhile back and found out that it is really not worth it until you get into heads and camshafts.

 

It depends on your mods. I like mine because I can keep the FP down at idle but increase it at WOT.

 

Here is one more pic of the set-up that I actually have on my car. That fist pic is not on my car.

 

hows the air get down in their with that huge tube in the way??

also kind of off topic, but whats the advantang of changing your fuel pressure? if i incresed my fuel pressure on ym stock l03, would i increase any performance?

 

Shifty, should I get one of those?


I'd modify my spacer ring with a grinder to keep that hose out of the way. looks like it really affects air flow man

 

Yea it is not the best for airflow, but with stock heads and cam I didn't feel any difference. Since I added the cam I have re-reouted it a bit but it is not as easy as it looks. You'll see if you get one. You have to fiddle with it.

The advantage is if you have some mods and you need a little more fuel but don't want to thcnage the prom. Most heads and cammed LO3's only use a basic adjustble regulaotr because they control all of the fueling in the chip. It is good all around because you can keep the pressure down at idle prevent it from running rich like a lot of other regulaotrs will leave you.

 

I don't like the vac regulators at all. I ran one last year and had nothing but problems, with quick accel engine stumbles. With running high pressure , the thing would casue big spikes in my pressure (only for a split sec). Motor runs better with no vac reg and a ltittle lower fuel pressure. They do however band-aid fix a cam install, without having to burn proms.

 

shifty,

running that vacuum hose around to the front sure looks like it's restricting the airflow. wouldn't it be better to hav it exit at the rear?

 

I need to look into getting a thiner and more flexible hose. The way the vacuum line comes out is angled and forces the line to go towards the front of the TBI. It is already bent to clear the side of the intake spacer or open element (depending on non drop or drop). It does restrict air flow but since I had stock heads and cam at the time I really didn't care. What I need to do is route it out the side or down and out of the open element. It is tricky peice let me tell you......

 

When I had one, I just grabbed that little vac line and bent it 1/3 of a trun to the back, then drilled a hole in the bottom of my air cleaner, to slide the vac hose through.

 

Cut the bend off of the vac fitting on the fpr. Install a molded 90 degree vac fitting and use some of the small hard plastic line GM uses for the vac canister, etc. Route the line out the back of the TB where the fuel lines enter.

 

Yea that is a good idea. I was planning on that but just never got to it. once I re route it I should have pics. Getting rid of that gold spacer will really help.

 

I turned the regulator 90*, trimed the length down and ran it out the back. I had to trim a tab on the flange to be abile to turn it 90*. Mine worked real good when I was running a LT1 cam. I was using about 15 lbs of pressure ( with no vacuum connected). I am running strait pressure with my setup now.

Shifty, get that darn hose out of the flow or we'll fire you as a moderater. Ya got to set a better example then that.

 

i tried it and did not like it. i needed more fuel down low as well as up top. i could have added more fuel down low with high FP and then regulate excess fuel on top with another REG but decided not worth it. issues with on gas hard and off and back on. imagine a road course. the vac signal not immediate enough and the vafpr slow to react. running independent of computer control. running large injectors with tuning was a better way to manage fuel.

 

I cured that problem by running a delay valve. That way when I was off or on the throttle vacuum signal did not spike. I have great luck with mine so far.

 

There's a cal out there that takes in to consideration the fuel flow changes of the vac ref fpr.

 

A cal?

 

http://www.efitune.com/forum/index.p...=ST&f=17&t=98&

 

Oh I see. Neat stuff.

 

This will help with running high fp's for WOT