Cams Flow More Air

[FordNut]

Got the new cams in, more duration and different indexing. Car has been running lean, especially on light acceleration. Seemed a bit sluggish too.

Got the old laptop out and got it running so I could tweak my tune, increased MAF xfer by 10% and reprogrammed the chip.

Much better performance, AFR looks more normal, EGT is lower.

Ready for a tune. Hope it doesn't need 10% more fuel at the top end, the fuel pump duty cycle was already around 90% with the old cams & tune.

[babbage]

sounds good. who is doing your tune?

[BeeDamn]

nice which brand?

[martyo]

Got the new cams in, more duration and different indexing. Car has been running lean, especially on light acceleration. Seemed a bit sluggish too.

Got the old laptop out and got it running so I could tweak my tune, increased MAF xfer by 10% and reprogrammed the chip.

Much better performance, AFR looks more normal, EGT is lower.

Ready for a tune. Hope it doesn't need 10% more fuel at the top end, the fuel pump duty cycle was already around 90% with the old cams & tune.

I would address the fuel before the tuning.

[FordNut]

nice which brand?

Comp. 226 intake, 232 exhaust duration, .475 intake lift, .450 exhaust lift.

[FordNut]

sounds good. who is doing your tune?

Jeff @ Mo's. Our schedules aren't meshing right now.

[FordNut]

I would address the fuel before the tuning.

Hoping for the best. I hear conflicting reports on the Aeromotive 340's with a returnless system. I already have twin GT Supercar pumps and as far as I know the next step up is the 340's. I don't want to go with a return system.

[WPG_Merc]

Comp. 226 intake, 232 exhaust duration, .475 intake lift, .450 exhaust lift.
Nice Brand :2thumbs:

[1stMerc]

Hoping for the best. I hear conflicting reports on the Aeromotive 340's with a returnless system. I already have twin GT Supercar pumps and as far as I know the next step up is the 340's. I don't want to go with a return system.

At your power level, why don't you want to go return style?

[Zack]

You need a return system

[BigM460]

Hoping for the best. I hear conflicting reports on the Aeromotive 340's with a returnless system. I already have twin GT Supercar pumps and as far as I know the next step up is the 340's. I don't want to go with a return system.

Have been running 2 aeromotive 340's with Jeff's tune for quite a while now. Daily driven too! Switch the pumps and Jeff will take care of it.

[FordNut]

Have been running 2 aeromotive 340's with Jeff's tune for quite a while now. Daily driven too! Switch the pumps and Jeff will take care of it.

Cool. So next weekend I'll change the pumps and fix the belt alignment issue, then be ready for a tune!

I also found this:

7.) Q: My car has a “return-less” fuel system and uses a driver module to use “pulse modulation” to vary the speed of the pump, thereby controlling fuel system flow and pressure (common in, but not exclusive to, Ford vehicles including Mustangs 1999 to present). Can the 340 Stealth Pump be pulse modulated without damaging it?

A: Much of the answer to this question can be found in 340 Stealth FAQ #6 with respect to the “returnless” part of this question, but with specific regard to the “pulse modulation” aspect, unlike most aftermarket in-tank style pumps, the Aeromotive 340 Stealth Pump is fully compatible with aggressive speed control strategies. One of the many features that make the 340 Stealth pump unique is the “turbine” style pumping mechanism. This type of pump is much more tolerant of the aggressive type of “Pulse Modulation” method of controlling pump speed, employed by the factory engineers, to create flow and control fuel pressure.

Unlike positive displacement pumping mechanisms, “turbine” rotors are not radically affected by the inertial forces related to the aggressive starting and stopping that is caused by the low frequency pulse modulation needed to vary fuel pressure by up to 30 PSI. Aggressive pulse modulation can “cog” a conventional pumping mechanism to pieces by locking it up in both directions on a continuous basis. The Aeromotive Stealth 340 Pump features the same “turbine” style pumping mechanism used by many OEM’s in these same applications, providing potentially excellent reliability in a speed controlled fuel system which has been properly re–engineered to take advantage of the Stealth 340’s high-flow capabilities.

[RacerX]

Brian, do you have a modified FPDM?

[FordNut]

Brian, do you have a modified FPDM?

Yes.

Electrical upgrades: Large power wire directly from fuse box/battery, relay controlled by inertia switch, upgraded FPDM, upgraded wires from FPDM to hat.

Fuel flow upgrades: Dual pumps, separate pump feed-thru fittings in hat, separate filters, Y- connected to second vapor line added to use as larger supply tube, then split at the engine compartment to feed the fuel rails separately. Didn't want to use the braided hose any more than necessary to prevent the gas smell.

[justbob]

Well it must be working if it's not shutting down from heat like mine was when I met you in Atlanta.. I upgraded to a ProCharger F-1A since then and I went return and never had to deal with that crap again!

As for the Aeromotive 340's they seem to be hit or miss. I've had one for almost three years (two years being return less) and it hums nice and quiet. The newer one added in April since going return sounds like sand in it but keeps up just fine.

The two together had no issue at all keeping up at 704hp on 110 octane. I never did see my FPDC but Jeff said to bring her back with a "real" clutch and head studs and he would show me mid to upper 800's on what I have currently since we had clutch slippage starting at 5,700 and shut her down.

As for stainless lines, all I used was Summit brand (the cheaper rubber not Teflon) and there is zero smell in my garage unless I run 110. The 110 makes the garage wreak.

That's my experience with the 340's. Hope that helps Brian.


Builder Of Badassery

[MOTOWN]

I would really consider a return style fuel system, at your power level that Whipple needs it.

[hotford]

Just do it and be done with it.............

run twin 405 with the second on a hobbs switch and u will never look back,
no need for any FPDm or to modify ones........

with the mods you have I'm surpised you haven't done so yet......


Hoping for the best. I hear conflicting reports on the Aeromotive 340's with a returnless system. I already have twin GT Supercar pumps and as far as I know the next step up is the 340's. I don't want to go with a return system.

[FordNut]

Got em in today. Seems to run ok but I won't know for sure til it hits the dyno.


Well it must be working if it's not shutting down from heat like mine was when I met you in Atlanta.. I upgraded to a ProCharger F-1A since then and I went return and never had to deal with that crap again!

As for the Aeromotive 340's they seem to be hit or miss. I've had one for almost three years (two years being return less) and it hums nice and quiet. The newer one added in April since going return sounds like sand in it but keeps up just fine.

The two together had no issue at all keeping up at 704hp on 110 octane. I never did see my FPDC but Jeff said to bring her back with a "real" clutch and head studs and he would show me mid to upper 800's on what I have currently since we had clutch slippage starting at 5,700 and shut her down.

As for stainless lines, all I used was Summit brand (the cheaper rubber not Teflon) and there is zero smell in my garage unless I run 110. The 110 makes the garage wreak.

That's my experience with the 340's. Hope that helps Brian.


Builder Of Badassery

[chief455]

90% DC before upgraded cams, probably be ~90% DC with upgraded cams and fuel pumps.
Seems like a ton of money, and work, to stop at adding a fuel system that could get you to ~50% DC on the high end, and leave a comfort zone - why risk it all?

[FordNut]

I already had the pumps. It took about 1/2 day to change them. It was essentially free. If it works out ok, great. If not, I'll deal with the next step at another time. Or maybe put a rev limit on it. I've grown weary of dumping money into the car. Really, 90% duty cycle wound up at WOT doesn't bother me. WOT only happens on the dyno or drag strip, maybe once a year.

[chief455]

I already had the pumps. It took about 1/2 day to change them. It was essentially free. If it works out ok, great. If not, I'll deal with the next step at another time. Or maybe put a rev limit on it. I've grown weary of dumping money into the car. Really, 90% duty cycle wound up at WOT doesn't bother me. WOT only happens on the dyno or drag strip, maybe once a year.

Alrighty then. Can't wait to read what the cam swap gains!