Installed a Stealth Stage 2 - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 22 (permalink) Old 10-05-2008, 01:28 AM Thread Starter
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Installed a Stealth Stage 2

Well I must say that I'm impressed with new Stealth pump. It goes in easy as pie and fit and finish are top notch. I have also installed the pump with the Quad feed kit and I think that's overkill for anything not running SHOs but it's still a nice piece.

I will say it's not on my truck but I like the fact that it moves just as much oil as the other pumps do in less space. When you have twins or a Supercharger that might be a good thing.

Any way I have before and after AE files and the pump added about 1200 PSI OP to the same tunes and the turck runs the same just has better HPOP OP and no ICP spikes on decell. We're going to see if the pump adds HP to a truck that has been running the same 300 HP config for 2 years.

One note. The Stealth and quad feed is a bit tight with an ITP reg return.

So far so good.

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post #2 of 22 (permalink) Old 10-05-2008, 02:21 AM
 
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Re: Installed a Stealth Stage 2

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When you have twins or a Supercharger that might be a good thing.
So you are gonna get a blower or a second turbo in between the HPOP and the OEM turbo pedestal in the valley?
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post #3 of 22 (permalink) Old 10-05-2008, 03:03 AM
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Re: Installed a Stealth Stage 2

Absolutely AWESOME Matt! Can't wait to see the Dyno numbers!

*48* Jim T. 2011 F-350 Lariat, CC, LB, SRW. White Platinum Metallic Tricoat. Black leather seats, I probably wont have*PMS,, with this one, at least no major attacks of it!
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post #4 of 22 (permalink) Old 10-05-2008, 04:01 AM
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Re: Installed a Stealth Stage 2

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Absolutely AWESOME Matt! Can't wait to see the Dyno numbers!
Jim, he is referring to the Stealth Stage II install on my truck.
Now we are chasing down a slight knock and a miss at idle.
A bad injector or two could be the culprit.
Several tests were done and passed all. Cylinder 4 had a red flag on a Per Del test (crank velocity). What ever that means.
Dyno event in two weeks and it is not running tops.

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A few mods to make it better than stock.
250cc hybrids, Stealth stage II HPOP, H-11 Headstuds, Strickly Diesel Reg. Return Fuel, Spearco 6.0 IC, Garrett 38r 1.15 hsg, BTS transmission, Gearhead Tuning
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post #5 of 22 (permalink) Old 10-05-2008, 11:01 AM
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Re: Installed a Stealth Stage 2

Sounds like an injector. I have had my truck pass the cct and buzz test but still have a "Miss" do the old fashion trouble shooting technique. Pull the VC's start it and unplug each one at idle. When one doesn't change the idle, that's the culprit of course. I would start with the one that had the PERDEL test, I think that is the "Rotational velocity of the crank" Another way to tell if an injector is bad....Here is something I read on that in another forum's AE thread. Remember for the CCT to be accurate the oil temp needs to be up to temp. 170* or more. (Right in that neighborhood I think)
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For 99-03 7.3L, another way to use AutoEnginuity to see if there are problems with a particular cylinder is to monitor the "Cylinder x Change Rotational Vel" or "Percentage of Crank Deceleration" PID (also commonly called PERDEL). This PID exists for all 8 cylinders and is a representation of crankshaft velocity change (decrease) at the time the cylinder is firing. Ideally, these should all read 0%. Any cylinder consistently reading more than 3-5% change in rotational velocity is suspect and should be further examined. Note: Engine should be fully warmed up before checking PERDEL data.
Good luck, and again, I can't wait to see the numbers.

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post #6 of 22 (permalink) Old 10-05-2008, 12:43 PM
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Re: Installed a Stealth Stage 2

That was the exact info we were going off of.
#4 is suspect. There were a few others that had a slight spike also but for the most part those numbers stayed low as #4 was going crazy with spike that was coinciding with the miss and rough idle.

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2000 F-250 Lariat, CC, 4x4, LWB,
A few mods to make it better than stock.
250cc hybrids, Stealth stage II HPOP, H-11 Headstuds, Strickly Diesel Reg. Return Fuel, Spearco 6.0 IC, Garrett 38r 1.15 hsg, BTS transmission, Gearhead Tuning
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post #7 of 22 (permalink) Old 10-05-2008, 03:41 PM
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Re: Installed a Stealth Stage 2

are you sure you aren't running too much ICP at idle because the IPR won't dump enough oil at idle with your current tuning? Just a guess... A big oil system does some funny things to the computer's operations assumptions. Sometimes if the ICP is too high at Idle the pulsewidth has to be too short for a good idle and some injectors will have more lag time than others and show differences in rotational velocity......

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post #8 of 22 (permalink) Old 10-05-2008, 04:28 PM
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Re: Installed a Stealth Stage 2

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are you sure you aren't running too much ICP at idle because the IPR won't dump enough oil at idle with your current tuning? Just a guess... A big oil system does some funny things to the computer's operations assumptions. Sometimes if the ICP is too high at Idle the pulsewidth has to be too short for a good idle and some injectors will have more lag time than others and show differences in rotational velocity......

You can (and should) even out all of the injector latency throughout any set of 8 so that it's not an issue. This should be done on the flow bench.

Although the problem isn't in the lag time. The problem is determined by how much fuel is injected between the time when the poppet pops up and how long it takes for the field to dissipate and the spring to pull it back down.

If it's a very fast injector and the pw is exactly long enough to just barely pop the armature up and then cut off you're still going to inject however much fuel the injector will flow in the time it takes for that poppet valve to float back down.

Obviously the higher the ICP the worse the situation because of the fact that the increased pressure only increases the minimum injection quantity for the injectors.

That's what you get up against at idle with fast injectors. If you made the poppet valve come back down on it's seat immediately you could have the smoothest idle possible, even with huge nozzles.
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post #9 of 22 (permalink) Old 10-05-2008, 05:29 PM
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Re: Installed a Stealth Stage 2

well mine aren't matched to anything other than making sure the intensifier pistons are within half a thousandth from each other and the nozzles were fresh. when my idle gets choppy it is always the same 2 cylinders getting intermittant rotational velocity differences.... I suspect these two are a little different than the other 6 as delivered from alliant.

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post #10 of 22 (permalink) Old 10-05-2008, 05:52 PM
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Re: Installed a Stealth Stage 2

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You can (and should) even out all of the injector latency throughout any set of 8 so that it's not an issue. This should be done on the flow bench.
What all is done to adjust that? Nozzle springs or something else?

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