well what i think he is trying to say is, even if your at 35psi on the line as soon as you drop the brake its going to put more load on the motor and kinda bog it out if you are running too much fuel. so if the head flowed better the fuel would be more quickly burned and gotten rid of to keep smoke down and power up. but spray will clean up the unburnt fuel untill you can really get the boost up. then you will need some water/meth to keep it cool and get a couple more ponies too.

 

what he said /\ im bad with words tonight

 

A good reason to run a rising rate regulator is to keep your initial timing at low rpms for bottom end power
If your fuel inlet pressure is 15 psi or so you are advancing the timing. The ve will start advancing timing as soon as your inlet pressure exceeds 7 psi or so.
When I redo my fuel system I will set initial pressure to 5-7 psi then use the rising rate regulator to increase it @ a 1:1 ratio with a max of about 40-50 psi.

 

GLHS I have toyed with doing the same thing as a test to see what it does for low end timing advance. I really want the best of both worlds, low end torque and top end timing. For performance the fast advance on my 14mm worked great as it could produce enough fuel to make use of the timing, but just driving around it was too much. Giles did some testing on the bench and found that with my modified vane pump and the higher case pressure combined with the stiff timing spring that inlet pressure did very little for case pressure. But again this is all custom stuff. When I put my 12mm back on I put it at stock timing just for fun and feel like I gained a lot more low end torque then when I had that same pump at 2.0mm. As far as adding a regulator, its kinda redundant having a bypass regulator on the airdog and a bypass regulator after the airdog. I have also considered removing the ball and spring from the air dog and putting a boost referenced regulator in its place. That would be a sweet setup and much less work to plumb too. An airdog with a boost referenced regulator would be sweet. I want to try this with my new 12mm I'm working on as it has stock case pressure and timing spring. Just Ideas. But for a drag only truck thats doing boosted launches, I would just run the high inlet pressure. I'm not too familiar with auto though. How many rpms does one build when doing boosted launches in an auto?

 

You might be able to put a stiff spring in the Airdog to regulate it to 40 psi(what I think they are good for) then set the rising rate regulator under the hood to 5 psi and it would then limit itself to 40 psi.
Call Airdog to find the max 100% duty cycle specs.

Or just plug the return on the Airdog and regulate it all from under the hood.
I just dont know how high of pressure it would build before it stops.

 

You're probably in for a combination similar to what I have, only you should make a lot more power with twins and an intercooler. I made 514rwhp through a non-lockup 727 on stock timing with no intercooler and no bottle heater on the nitrous. Going back in a bit with 10 deg. more timing and we'll see if it blows up or what. I have an Air Dog II, and the gauge started to flutter above about 30psi, so that's where it sits right now with a loc-tite front seal. I think 11s should be no problem in a short bed with traction.

I had a 14mm/4mm pump seize, but the 14mm head and stock camplate seems to be working fine. With nitrous and a lock-up trans, 700 to 800 hp out of a VE should be possible.

 

An airdog will put out 60 psi if its not regulated. (already had this discussion with their tech guy) Not sure if its made to sustain that though. But if you plug the airdog return line it will not remove the air from the fuel. It sends excess fuel and the entrained air out the return line so if you block it off you will have all that air in the line. In which case its not better than a raptor or aeromotive pump. They do have a 30 psi spring for it and if you need more you can shim it or play around with your own spring. JQMILE how much fuel did you get from your 14mm stock camplate combo?

 

I think he said 370 ccs in the articule.

 

There is a full writeup on what I did, the results, and fiddling with the wastegates in the Aug issue of Diesel Power mag (white truck on the cover). I was actually not very happy with that number, I was looking for more. Latley I've been too busy to do anything with the truck....the last thing I did with it is move a bunch of crap when I moved to a new apartment. Gotta still use it as a truck, right?