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2001 Cobra Eaton Swap, Tuning and Fuel System Question

Discussion in 'Engine/Tuning' started by vdubn, Sep 17, 2019.

  1. vdubn

    vdubn New Member Established Member

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    I have 99% of the parts to do the swap, just finishing up some small details like who to have tune the car, which fuel supply system to run, etc.

    I initially was going to keep my 2001 tank and just do the BBK 300lph drop-in pump, but found a good deal on a 2003 Tank with new dual DW300 pumps. I talked to the folks at LethalPerformance, and they mentioned that these pumps are good for up to 700-800 hp, which is more than I am shooting for, so I won't need to change anything in the tank.

    I just got back my Stage 8 Port Eaton blower, Plenum, and TB, and the modified MAF and flowed 39# injectors (flowed by Stiegemeier to 60#) from Stiegemeier. With a 2.7" pulley, and a 10:1 Aluminator short block, he said I should be pushing around 16 to 18 psi of boost, depending on exhaust, etc. Estimates would be around 550 whp, after it gets tuned.

    So, my question is, do I need a dual FPDM from a Cobra, or will my stock 2001 Cobra single-pump FPDM do the job?

    Last question, which tuner should I use? I have had good luck with Lund in my Coyote swapped SC car, but they are really expensive for just the tune (like $1200). VMP looks good, they are $600 for the tune with an SCT Tuner included, but I haven't heard any feedback from folks about them. I am hoping to find someone to do the internet tuning for the base file and first couple datalogs, as I don't know of a dyno close to me to get it running.

    Thanks in advance for any advice you can offer.
     
  2. slo984now

    slo984now AKA 01yellerCobra Established Member

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    The 03/04 Cobras have a single FPDM just like the earlier models. Actually all models use the same FPDM regardless of what engine and fuel system installed at the factory. After saying all that I would at least upgrade to dual FPDM's with the wire upgrade. I've ran a single FPDM on twin GT pumps for years with no issue, but I'd imagine the DW300's need more current.

    What fuel are you going to be running? That really will dictate final power.

    As for a tuner contact MalcolmV8, 04sleeper, or decipha on here for your tuning needs.
     
  3. vdubn

    vdubn New Member Established Member

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    The best fuel we have here in Oregon is 91 or occasionally you can find 93. I just got done talking to Bob, and he is thinking my boost numbers could be at 18psi or so, so I may actually start with a 3" pulley versus the 2.8" that is currently on the Eaton. I would prefer to tune with it around 16psi, but maybe it doesn't matter in the end. The forged bottom end should handle every bit of 20psi or so, right?

    Thanks for the advice on the tuners, I will reach out to them, and get an idea what all is involved.
     
  4. decipha

    decipha Active Member Established Member

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    as slo984now stated dual fpdm's are ideal

    what modified maf do you have?
    39lb injectors cannot support 550rwhp safely

    10:1 compression at 18lbs is going to hurt performance on pump gas. Very doubtful you'd be able to make 550rwhp safely on pump and your engine wouldn't survive on E-85 with only 39lb injectors.

    Your best bet would be to upgrade at a minimum to no less than 80lb siemens deka injectors from chris at poweraddersolutions.

    Lund is iffy on the older cars they usually require specific injectors and mafs and if you don't have them they sometimes won't tune your vehicle. Be sure you verify with them beforehand if you go that route.

    $600 for VMP with a handheld included is a bargain.

    I charge $450 for online/remote tunes with the custom tuning software included. You will need to buy a moates quarterhorse for $250 though. details- Custom Tuning - EFIDynoTuning.com

    You will have to check with malcolm and sleeper to see what they charge for tuning +hardware. They may be a cheaper option.

    Any tuner you go with should be able to get the job done no problem. That's a pretty basic and common setup you have.
     
  5. vdubn

    vdubn New Member Established Member

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    decipha, thanks for the response. The injectors are 39# that were flowed out to 60# by Bob Stiegemeier, he said just to tell the tuners that they are 39# though, something about the maps in the tune??? Also, the MAF is modified by Bob as well. Bob said that the tune should run right at 19 degrees timing, no less than 17 degrees due to heat generated in the headers, any more than 19 and detonation. If I need to run additive to the fuel, I can do that as well, or if its smarter to just bump up to a 3" pulley to drop the boost a bit, I am open to that as well. I sent them a message asking for details, and was going to do the same to you, but you saved me that step :). I have heard of the Moates quarterhorse before, I think back when I was looking at tuning options with the EFI in my FoxBody.

    Thanks again for the information
     
    Last edited: Sep 17, 2019
  6. blownstang4.6

    blownstang4.6 Active Member Established Member

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    91 isn't going to cut it if you want to make any decent power. Will at least need to spray meth if you don't have 93 or E85 readily available.
     
  7. vdubn

    vdubn New Member Established Member

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    I ran 91 on my Coyote engine that had the GT500 Eaton setup on it, but it was at the most 10psi. In order to run the higher boost, sounds like I will need to use additive, or get meth injection. In checking with DeatchWerks, and Bob Steg, it sounds like I can run a 50/50 mix of E85, but probably not full E85 with the injectors I'm running. Would running 50/50 E85/91 Octane help enough?

    decipha, I read your tune page, lots of good info there, answered most of the questions in my last post to you. Looking forward to your response as it relates to the injectors/MAF, etc.
     
  8. slo984now

    slo984now AKA 01yellerCobra Established Member

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    That makes no sense on the injectors to me. Unless he drilled them out they won't flow 60lb. And if they actually flow 60lb then the 39lb values won't work.

    It sounds to me like he's trying to trick the ECU somehow with the MAF and injectors. Unless he wrote the tune he won't know what timing the ECU is going to see.

    Talk to whoever you want to tune the car. Ask them what parts they prefer.
     
  9. vdubn

    vdubn New Member Established Member

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    You are correct with the mapping. Because they are a stock injector, they are fully mapped by the ECU. I have flow bench papers showing that the stock injectors flowed 59#-60# after Bob Steigemeier did his magic. He has dyno sheets showing almost 600 whp on an 03/04 Cobra with ported Eaton and his modified MAF
     
  10. slo984now

    slo984now AKA 01yellerCobra Established Member

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    You can't compare the Coyote to these engines. Yes they're high compression, but the VVT makes it possible to bleed off pressure and keep detonation at bay. Along with the better flowing heads. It's not an apples to apples comparison.
     
    vdubn likes this.
  11. wkornf

    wkornf Member Established Member

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    plenty of people in the import and LS world decap injectors and get 50% flow. I've never seen it mentioned before on mustang forums.

    it impacts spray pattern but seems reliable enough for boosted guys.







    Sent from my SM-G930V using Tapatalk
     
  12. blownstang4.6

    blownstang4.6 Active Member Established Member

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    Doesn't make sense to run 50/50. Becomes a huge pain. Either full E85 or full 91. If they do flow 60lbs you're only going to get 500-550rwhp on E85. With that much boost you might not even get that high. Upgrade to larger injectors. I'm making just shy of 550rwhp through an auto on my stock Mach motor with maxed 60's and E85. Vortech at 12psi. Upgrade to larger injectors before you put it back together to get tuned.
     
    Last edited: Sep 18, 2019
  13. slo984now

    slo984now AKA 01yellerCobra Established Member

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    Like they just removed the pintle caps and ran them like that?
     
  14. wkornf

    wkornf Member Established Member

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    it's probably a bit more but heres 1 example

    Sent from my SM-G930V using Tapatalk
     
  15. GodStang

    GodStang Well-Known Member Established Member

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    FRPP 80s are so cheap and they just run fantastic on low power cars and up past 800rwhp on E85. Also be careful with Meth on a PD blower as you have to run it different than you would on a centri blower or Turbo car.
     

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