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Thread: 400FWHP TBI build attempt thread

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  1. #1
    Fuel Injected!
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    Mar 2015
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    400FWHP TBI build attempt thread

    1992 C1500 extended cab I picked up for $450.00. Bad 700R4, body damage in the front right corner, GT4 (3.73) rear. Going hydraulic roller. EBL Flash acquired, working on first step with VE tables for (hopefully) start and first run once it's all put together with the upgrades. Rebuilt 700R4 going back in tomorrow, then figuring out why I'm getting the code 23 and doing some driving and tweaking the tune for more experience with EBL Flash prior to buildup. I've researched what I want to do since June and have found a great deal of info along the way, thanks to the dedication of the community. Sean at SPR and Bob at Dynamic EFI have been great to deal with. Brian H's site was the first I found on the subject of TBI performance and has been a great help as well. Tomorrow, transmission. Then the fun begins. Tomorrow I'll post up my first stab at putting together VE tables for all these mods to come. May be good for laughs, might be in the ballpark.
    Last edited by Gojira94; 12-19-2016 at 09:44 PM. Reason: OCD

  2. #2
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    Well, the line breaks didn't make it into the post. replaced with screenshot.
    Last edited by Gojira94; 12-19-2016 at 09:45 PM. Reason: OCD

  3. #3
    Fuel Injected!
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    Here are the VE tables I came up with as a starting point. I used a calculator to generate some fairly sparse data points and then filled in and shaped them in TunerPro. They may be total crap, I'm not sure. The transition from low to high is smooth and the highest VE is in the area where the engine should make the most torque efficiently.

  4. #4
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    I'm needing some guidance with what to input for BPC calculation in EBL Flash. I originally calculated using the TBI Fueling page at dynamicefi.com before getting started. I reckoned a hair under the example used on the site and came up with 80# injectors at 22-23psi, 85% duty cycle. I realize that's the point at which it would need max fuel for theoretical max HP at 5500-5700RPM and not where the engine will be running 95% of the time. I talked to Sean at SPR when I ordered the TBI, told him my mods/ goals/ expected HP needed to support, that I'd be using an Aeromotive 13301 VRFPR and would need a blockoff plate. He said BBC injectors are not the way to go, just dial up the pressure on the 60.5# injectors. Using the BPC calculator, I get 39psi needed to support that peak HP with 60.5#s. This seems like an easy place to completely blow the tune if BPC is wrong from pressure and flow rates way off. So my questions are 1) How much pressure can the 5235206 injectors handle? 2) If they can handle 39psi, I'm wondering where to set the base pressure on the regulator with the 20-65# spring? 3) Would a minimum of 20# be too much and I should be looking for a spring more like 15-45psi that fits the 13301? Thanks

  5. #5
    Fuel Injected!
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    Mar 2015
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    Another EBL Flash question

    I think I've answered my own questions about the pressure. 39-40psi will be ok, EBL's BPC tables will handle it. Base pressure on the 20-60# spring needs to be set at 39-40psi with the vacuum nipple open to air. Then connect it and let vacuum handle the pressure drop at idle, with corresponding BPC vs. VAC table values. I expect a touch over 15" Hg at commanded idle speeds with IAC vs. temp at normal operating temps. Next question is why am I missing the BST-BPC vs Boost for a 1-bar MAP?? I see 4 tables each for 2-bar and 3-bar but none for 1-bar. I looked in the option words and as expected none of the 2 or 3-bar words are set, and apparently I didn't miss turning on the default of 1-bar MAP. So, if using a 1-bar MAP, just don't worry about the BST-BPC vs Boost? I think this is pretty much the last thing for the base starter tune. Again, any feedback or criticism of anything I've posted so far with any of this is appreciated.

  6. #6
    Fuel Injected!
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    Personally I wpuld run the big block injectors at that power level. I have run the 61s as high as 50 psi but the opening and closing times start to get too long for higher rpm use.

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