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Custom tune by Henson

Discussion in 'Computers, Chips & Tuning' started by 2000StreetRod, December 17, 2009.

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    1. Got2bneo

      Got2bneo Active Member

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      What kind of gains do you get?
       
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    3. theSpoon

      theSpoon Active Member

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      Definitely going to consider getting an x3 after my tax return comes in :). any reason I shouldn't? I do plan to do some later modifications to the engine though, like a coil pack, electric fan, high amp alternator. I have a CAI, A/C Delete and am working on an exhaust (catalytic converter below efficiency so I'm doing a custom exhaust from cats to tailpipe). Which mods would directly affect a tune? should I focus on certain ones more than others before purchasing a tuner? Also does the A/C delete change anything about a tune? Just asking because the answers may change what order I do things in. explorer is a 97 sport sohc 4x4
       
    4. 2000StreetRod

      2000StreetRod Staff Member Moderator Elite Explorer

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      gains?

      Don't know yet. The day after the tune was completed I started pulling the engine to replace timing chain components. However, just the transmission shift point changes were worth the cost.
       
    5. 2000StreetRod

      2000StreetRod Staff Member Moderator Elite Explorer

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      exhaust may affect tune

      I suspect the only thing that might affect the tune is the exhaust mod. I would complete that before starting the tune.
       
    6. Keeper0311

      Keeper0311 Well-Known Member

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      So any update on the gains from your tune?
       
    7. 2000StreetRod

      2000StreetRod Staff Member Moderator Elite Explorer

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      On hold

      My dyno testing is on hold pending replacement of the knock sensor which is retarding the ignition timing.

      The knock sensor replacement is on hold pending resolution of a newly occurring transmission 3>4 shift flare.
       
    8. loudsport

      loudsport Member

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      im about to order the same part. have a couple questions about raising the rpms...i would like to increase my rmps so that my voltage stays up while the car is in park to keep my voltage up for my soundsystem. is that posiblle with the X3 Powerflash???
      thanx
       
    9. 2000StreetRod

      2000StreetRod Staff Member Moderator Elite Explorer

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      Forced induction custom tune

      My normally aspirated performance baseline is 170 rwhp and 206 rwtq. I am resuming this thread to document the generation and testing of a remote custom tune by James Henson for my new vehicle configuration:

      Eaton M90 supercharger from 1991 Thunderbird
      2.7" dia keyed supercharger pulley
      Lightning 90 mm MAF sensor
      Mustang 75 mm racing throttle body
      Aeromotive Stealth 340 fuel pump 11142
      Siemans Deka 4 high impedance (long style) injectors with EV1 connector (60 lbs/hr @ 43.5 psi)
      Custom high flow exhaust

      My target maximum boost is 8 psi. I tried to size the blower pulley to match the low pressure exhaust system to achieve the desired boost. The current fuel pressure is 67 psi but I plan to incorporate an electronic fuel pump controller (FPC) set to 43.5 psi. Edit: I decided to set the FPC pressure to 39.15 psi which is the target specified differential fuel pressure for the Deka 4 injectors.

      I tried the initial tune today and the engine started but would not idle because the air/fuel ratio was almost 10:1. I was able to datalog a few seconds of engine run time and sent the file to James for review. I'll work on a coolant leak and vacuum/boost gauge installation while waiting for another tune from James.
       
      Last edited: April 16, 2014
    10. 2000StreetRod

      2000StreetRod Staff Member Moderator Elite Explorer

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      2nd tune received

      I received an updated tune from James this morning. He mainly just leaned the a/f ratio at idle to mid range since the datalog I sent was very short (just barely switched to closed loop) and I was fluttering the throttle to keep the engine running. I'll load it and try it after I finish reworking the remote IAC valve. I'll probably wait until I get the electronic fuel pump controller working before I send James another datalog since the lower fuel pressure (39.15 instead of 67 psi) will affect the a/f ratio and his tuning.
       
      Last edited: April 16, 2014
    11. 2000StreetRod

      2000StreetRod Staff Member Moderator Elite Explorer

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      tricked by a/f meter count down

      I performed an engine start and a short datalog today to confirm I have the requested parameters properly selected. I was surprised by the results. When the engine started the a/f ratio was slightly above 10:1 which is what the meter outputs until the 20 second count down for the wideband O2 sensor heater is complete. The ambient temperature was 46 deg F and I had to open the throttle plate a little to keep the engine running. The PCM open loop flag toggled to closed loop 22 seconds after engine start and less than 2 seconds later the a/f ratio jumped to 16:1 as a result of the a/f meter count down being completed. It stayed there for 113 seconds and then dropped to 14.65:1. James mentioned to me that I needed to keep the engine running for about 140 seconds for the PCM to enter closed loop. I don't know why the open loop flag toggles 115 seconds before the PCM starts controlling the a/f ratio based on O2 sensor data.

      I now know that for my previous datalog I was tricked by the a/f meter count down and thought the mixture was way rich. I should have realized that if the a/f ratio was 10:1 there would have been plenty of black smoke exiting the tailpipe. Since I was not able to keep the engine running at least 20 seconds I never did have any useful a/f data. I mistakenly told James the a/f was too rich and he leaned it up for the second tune. I'll reload the first tune and perform another datalog after I get the fuel pump controller functional.
       
    12. 2000StreetRod

      2000StreetRod Staff Member Moderator Elite Explorer

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      Static load step test

      I realized that if I connected the previously capped air port on the solid state fuel pressure sensor to the intake manifold the electronic fuel pump controller would maintain a constant pressure delta across the fuel injectors. I had to remove the plenum and a lot of other things to connect the hose. I decreased the injector differential pressure from 43.5 psi to 39 psi - the designed target delta pressure for the injectors. After performing the modification I loaded the latest version of my tune from James and performed a static load step test. With the engine in Park and fully warmed up I datalogged engine pids holding the engine at the following speeds for about 15 seconds: 1500, 2000, 2500, 3000, 3500, idle. I'm still having problems with the wideband AFR meter. After counting down for 20 seconds for the heater to warm up the O2 sensor the meter immediately displays the maximum reading (16:1). I changed the scale to increase the maximum to 20:1 and then it displayed 20:1. I didn't need the AFR readings for the step test but soon I will need accurate readings.
       
    13. 2000StreetRod

      2000StreetRod Staff Member Moderator Elite Explorer

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      driving with no boost

      The next phase is datalogging drives that load the engine (avoiding WOT and boost) with the vehicle warmed up and the adaptive fuel capability disabled. With the PCM in closed loop the fuel trims are calculated by the PCM and logged indicating whether the mixture is rich or lean for various engine speeds and loads. It's important to maintain a constant throttle and engine speed long enough for the fuel trims to stabilize. Then James can change the MAF transfer function or the fuel injector slopes to reduce the difference between commanded lambda and actual. Once the lambda is correct at low and mid engine speeds and loads, testing can progress to WOT and boost.

      I checked the power and ground connections to the wideband AFR meter and found nothing suspicious. I replaced the wideband O2 sensor but it made no difference.

      Another issue with the tunes is the timing is less advanced than desired for normal performance which James is working to correct.
       
    14. 2000StreetRod

      2000StreetRod Staff Member Moderator Elite Explorer

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      Tip-in spark retard

      There is a significant problem with the spark being retarded when the engine speed transitions from idle as the accelerator is depressed (tip-in). Even when the accelerator is slowly depressed the spark rapidly retards - sometimes to 0 degrees advance. The result is very low power and a tendency to buck or stall. The source of the problem is torque reduction or truncation and James has sent me two tune versions to correct it but the problem persists. The fuel ratios are good under low loads but higher loads can't really be tested/adjusted until the tip-in spark retard is fixed.
       
    15. Bobbylew

      Bobbylew Elite Explorer

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      Well, this is an old post and I hope you are still enjoying the extra performance. Unfortunately, it looks like Henson Performance is no longer in operation. All I'm looking for is a way to get my friend's 2004 Explorer XLS back in operation. The poor guy has managed to lose every, single PATS Coded key and doesn't have the money to take it to a dealer for reprogramming, etc. I got an X3 used and contacted SCT about getting a custom tune to eliminate the PATS altogether. All I got in return was they told me to find a dealer near me and contact them.

      I'm beginning to think that SCT wants to sell these tuners, take the money and to hell with everyone else! I'm also, thinking I've been sold a bill of goods in a handheld package! SCT make tuners, or SCAM Boxes?
       
    16. 2000StreetRod

      2000StreetRod Staff Member Moderator Elite Explorer

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      Your friend's cheapest and least complicated solution is to find a PATS qualified locksmith and get 3 keys made. It will take about 45 minutes and cost around $300. The locksmith with his equipment must be with the vehicle. Either you tow the vehicle to the locksmith or comes to the vehicle.
      Your X3 can reprogram the PCM to disable the PATS but only after it downloads an image of the PCM program which requires a PATS recognized key. Reprogramming also requires a custom tune to load into the PCM. The custom tune will cost about $150 or you can purchase SCT's custom tuning capability for about $400. If PATS was easy to defeat it would not be an effective theft deterrent.
       
    17. Bobbylew

      Bobbylew Elite Explorer

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      Well, this is an old post and I hope you are still enjoying the extra performance. Unfortunately, it looks like Henson Performance is no longer in operation. All I'm looking for is a way to get my friend's 2004 Explorer XLS back in operation. The poor guy has managed to lose every, single PATS Coded key and doesn't have the money to take it to a dealer for reprogramming, etc. I got an X3 used and contacted SCT about getting a custom tune to eliminate the PATS altogether. All I got in return was they told me to find a dealer near me and contact them.

      I'm beginning to think that SCT wants to sell these tuners, take the money and to hell with everyone else! I'm also, thinking I've been sold a bill of goods in a handheld package! SCT make tuners, or SCAM Boxes?
      As far as I'm concerned, PATS, VATS and all of the so-called "theft deterrent" are government mandated items that cause more problems than they solve, but we have to live with them. Who would want to steal a 12 year old P.O.S, in the first place? Oh well.

      I found a firm who will sell me a programmed/updated PCM with 2, coded uncut keys for under $300.00 so that may be the way to go. I love the guy like a brother, but he gets goofy about certain things and one is trailering it to a dealer. What the heck. We're all goofy. How he could manage to lose every coded key is amazing to me! LOL Thanks for the input.
       
    18. 2000StreetRod

      2000StreetRod Staff Member Moderator Elite Explorer

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      I have three different coded keys for my PATS vehicles. That way if I lose a key I can purchase another key and program the PCM to recognize it. However, there are now machines available at Ace Hardware that can clone a key at a reasonable price which makes that an option.
       

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