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chpspecial

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Posts posted by chpspecial

  3. lost low end with LSXRT?

    in Bolt On Performance

    Posted

    It can't be a vacumm leak if it idols fine but shuts off when it comes to a stop if you let the rpms keep dropping?

    I am assuming I need a ls2 tb now.

    Actually a small vacuum leak can help aid in idle especially if at idle the truck doesn't have enough commanded idle air flow. Similar to drilling the tb.

     

     

    Sent from my HTC6500LVW using Tapatalk

  4. adjusting timing HPT

    in PCM Tuning

    Posted

    gallery_4677_321_106952.jpg

     

     

    The area in red is the WOT timing, this is where you should of had your timing taken out, don't worry about these values as this table is from a completely different vehicle. BTW, where you set up for a 200 shot of nitrous. 7* of timing is a lot to take out.

  5. lost low end with LSXRT?

    in Bolt On Performance

    Posted

    My tuner was saying something similar to this and said not to bother with this intake due to leaks and having issues tuning

    Proper installation fixes most issues. Most people don't take the time to properly set up for the install. They usually just want to slap things on and call it a day

     

    Sent from my HTC6500LVW using Tapatalk

  6. lost low end with LSXRT?

    in Bolt On Performance

    Posted

    Tb isn't going to be the issue of the tb was fine before the swap. The lsxrt is sensitive to installation and can very easily have unwanted air leaks which can cause said issues.

     

    As for everyone that keeps on throwing "tuning" under the bus, you guys need to open a book and see how an intake manifold affects an engine tune, and how the pcm/ecm handles those changes. A tune will not fix a mechanical issue such as a vacuum leak but it can mask it.

     

    By nature, the lsxrt is a high top end manifold, loss in low end is a major sacrifice here... This is a case of throwing parts at an engine isn't necessarily equal to better performance. Research and goals are a big part of putting parts together.

     

    Sent from my HTC6500LVW using Tapatalk

  7. adjusting timing HPT

    in PCM Tuning

    Posted

    It's somewhat involved. You can't just add 7° a cross the board. All you should need to do is go to the g/sec where you are in high load and adjust there. Usually the .68+ g/sec tables on a stockish truck

     

    Sent from my HTC6500LVW using Tapatalk

  10. AWD dyno results

    in Street

    Posted

    There is more to a dyno than just a number. Was it a load bearing dyno, or just a pancy inertia dyno? They also need to be calibrated and adjusted for atmospheric conditions.

     

    Sent from my HTC6500LVW using Tapatalk

  13. E-fan tune

    in PCM Tuning

    Posted

    Side business or not, you'd be surprised at the number of call and customers he has to deal with. Sometimes he can't get to them and so many come in that there are a few that slip past him.

     

    Sent from my HTC6500LVW using Tapatalk

  15. Wire question

    in General SS

    Posted

    That's is the wire for the chmsl. (center high mount stop lamp). I.e. the third brake lamp. If you have a camper or bed cover this is where you connect the brake lamp to

     

    Sent from my HTC6500LVW using Tapatalk

  16. Need some serious help here

    in Engine Tech And Modification

    Posted

    I don't remember what the default on the vvt set up is when there is nothing plugged into the engine side, the truck can potentially be in vvt without a signal causing it to run rough. There are two options. 1, wire in the vvt to your pcm and use a vvt calibration file, or do the vvt delete to the engine.

     

    Sent from my HTC6500LVW using Tapatalk

  20. Reduced engine power

    in General SS

    Posted

    I would see if anybody in your area has a different Dr. X harness you could try. From there I would check all of the plugs to make sure that there isn't a short or broken wire in ant of the tac/peddle/tb plugs

     

    Sent from my HTC6500LVW using Tapatalk

     

     

  22. What spark plugs are you running?

    in General SS

    Posted

    I don't have any issues with the tr55. How big a difference between the two?

    The only difference is the gap. The TR5 use a gap of .039, the TR55 has a gap of .059

     

    I like the TR 55 myself as when i tried using the TR5 with the smaller gap the motor didnt like it. I run my plugs between .055 to .060 since 04 with no issues.

     

    It's not just the gap difference. They are also half a step colder. The combo of gap and heat range helps out truck that have a slight miss at idle plus improved throttle response. A tune usually over comes this, but this is how gm fixed the low or erratic idle on most truck.

     

    Sent from my HTC6500LVW using Tapatalk

     

     

  24. Tuning Section Warning

    in PCM Tuning

    Posted

     

    In addition, never flash your tune with the laptop plugged into (charging from) the power port on your truck using a power inverter. This has been confirmed to fry some PCM's using HPT.

     

    It can also fry the hpt/Efilive interface. However, Efilive has released the IGo charger as a safe power source. I have one and works great.

     

     

    Sent from my HTC6500LVW using Tapatalk

     

     

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