Marcel Burkett

Just curious because I am also using this pump , one of our losal street / strip guys is running a T66.6 , large street port , 80shot NOS , 4 - 1600cc injestors and making 508whp on a Dyno jet , he said that the injectors ar now running at 98% duty cucle and his fuel pressure dropping when he is at 20psi ( his max) , anyone else experience this , should I be looking for another pump too

50tooslow

Not that this will be an exact comparison, but my buddy has a single turbo supra who is putting down over 700rwhp (dynoed) with the AS1000 and has 6x 850. I can't imagine that he would be at 98% on 4x1600's. That is crazy, is he running methanol?

Marcel Burkett

Nope , hes running pump gas on the street and race (VP-c16 ) at the track.

rxrotary2_7

have not gotten that far yet.

Marcel Burkett

Something seems suspiciously wrong with that situiation !.

vosko

iTrader: (4)

is he running stock fuel lines ? possible fuel lines are too small ?

Marcel Burkett

Nope running -10an steel braid to and from rails.

sub-zero

I cant see it running out of fuel pressure. It is a huge pump and just like rxrotary2_7, I have not been able to get the car together yet. If He has ran 10 or 8 lines to the rails it should be more then enough, I hope anyways. Plugged filters?

vosko

iTrader: (4)

i made 459rwhp @ 15psi with 750/1600 injectors..... with a SX external pump. i could understand like 700-800rwhp and the pump not keeping up but i think its something else. is the fuel properly wired. check the voltage at the pump

rxrotary2_7

no, my car runs, and runs pretty strong... i was saying i haev not outran the pump yet.

TYSON

It's entirely possible that he has it maxed out. Aeromotive claims "up to 800 HP - forced air induction"

Aeromotive A1000

What if they are talking about a supercharged V-8 with 10 PSI of boost, 13.5 Volts to pump, 45 PSI base fuel pressure can make "up to 800HP"?

Your friend is quite a bit different. He is producing around 600 HP. He is at 20 PSI boost, let's say 45 PSI base fuel pressure. The pump produces 15% less flow at 65 PSI compared to 55 PSI. 800 HP now reduced to 680 HP.

We already know rotaries produce a little less power than a piston engine with the equivalent air / fuel. Let's say the difference between your friends rotary and piston VE is 10% (Just an example, I don't know exactly ) 680 HP reduced to 612 HP.

What if your friend has a problem with his alternator or wiring to the pump, and all he gets is 12 Vdc to the pump? At 65 PSI with the Aeromotive that's a 20% flow loss. 612 HP reduced to 490 HP.

If he is running overly rich, he is wasting flow from the pump, AND reducing power output at the same time.

All sorts of things can happen at high flow rates. The Aeromotive A1000 is a big pump, but it still has limits. Obviously your friend doesn't have all the problems I've listed, or he would have maxed out the pump before now. The 'Eliminator' from Aeromotive is bigger and still has the -10 outlet.

Anyway, use the charts from Aeromotive for the pumps and Max Coopers Fuel System Calculator to ballpark how much fuel you need. We want this car of yours up and running!

Marcel Burkett

By the end of the week BABY !!!!!!........, I can hardly wait !!!!

AJC13B

I have 2 x 1650cc and 2 x 720 with a static fuel pressure of 45psi. On 26psi and C16, duty cycle was only about 85% and it made about 550hp dynojet.

What mixtures is your guy running? Are you sure they are all 1600cc injectors?

Marcel Burkett

Yep , he is using a full set of four and he said his a/f ratios were falling.

AJC13B

I would have him get the injectors flow tested to make sure they are flowing 1600cc each....

680RWHP12A

i maxed that pump out! i called Aremotive and they told me all thiere pumps are rated at 14 volts! WTF i said, any how, i upgraded to thier bad boy, then maxed that one out!!! now i bought the MSD boost a pump, @30 psi the pump voltage climbes to 27 volts! hopefully that will work, they claim it will, we will see!!

Marcel Burkett

What is your static fuel presure ? , it is well known that the flow of any pump will fall as the backpressure / discharge presure rises , how many injectors are you using and what size are they ?, I would think that one should look at increasing the size and / or number of injectors so that the forward flow of the pump is maintained , if the injectors are too small , the pressure in the system would rise when the regulator closes causing the system presure to rise causing the forward flow to fall off , remember the flow of those pumps are given @ 45psi , if this pressure is doubled then of course the flow would be halved , give or take a few litres .
The guy I am speakin of is now looking for a WALBRO or WELDON pump to supply 500 l/h@80psi !!!!!..............
isn't it known that overly high pressures (80 plus)are not desirable for fuel injectors , if you know that you are using a 1:1 reg. and intend to run 30psi boost then you should set your fuel pressure between 37-40 psi @ atmospheric pressure , ( the proper way to set this is to remove the reference line from the reg . so that it would see atm. pressure , set it and reoplace the referance line) so that when max. boost is reached you are still below the limit .I am not criticizeing anyone but something seems wrong , even if you supply your pump with 50 volts it will only do so much according to its curve and how much it can push forward through the injectors , look at those methanol guys they use a **** load of injectors , why didn't they just put in 1000l/hr pump to ge their volume to the engine ? , and also I am not sure about this ,but would'n "zapping'" the pump shorten its life ? ,I saw the MSD amp on SUMMITS site for about $230 , for $100 more I think I would have bought another A1000 and run it in parallel , have twice the VOLUME and a back up pump so I could at least get home if one fails .