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Recent content by derpyimp

  1. derpyimp

    Need Advice on Water/Meth Injection

    Hey guys, I'm considering doing water/meth injection on my car but I'm not sure what exactly I need. I have read that it needs to be tuned to adjust the AFR to account for the methanol, and that it will require a wideband oxygen sensor to tune properly. I would plan to spray 70/30 mix so I can...
  2. derpyimp

    Looking for recommendations on Comp G suspension upgrades

    I'm considering upgrading the suspension on my 2004 Comp G in the near future. I've been reading a lot of forum posts on suspension upgrades, but everybody seems to recommend something different and most threads are for 97-03 GPs, which I know have a softer suspension than a Comp G. So some...
  3. derpyimp

    Vibration during braking - thoughts?

    Hey guys, I've got a quick dash cam video for you to watch. I was out driving down the canyon, pushing the car a bit but nothing too crazy. During the last two or three turns I started to notice a slight vibration when I was on the brakes, then it got really bad as I was on the last turn before...
  4. derpyimp

    Replacement headlight housings - do they suck?

    My headlight housings are super fogged and one is also cracked. They are too far gone to be restored, so I'm looking for replacement housings. Has anybody tried the housings available on ebay/amazon and can tell me how they compare to OE housings? Just want to make sure I get a product that will...
  5. derpyimp

    Need help with a P0300 code

    Hey guys, I could use a few ideas on this one. My wife drives a 2005 Chevy Impala with the N/A 3800, and it started misfiring yesterday. Today it got worse and started throwing P0300 for multiple/random misfires. I test-drove it and I can only get it to misfire at about 75-100% throttle, and...
  6. derpyimp

    Went to the track for the first time!

    Yesterday I went to the track for the first time ever. My goal was just to get into the 14s since the track is at high altitude (4252 feet). I only got four passes in because one lane got shut down early, but I got a best time of 14.871 @ 93.30 with a 2.161 60' on 91 octane gas. I was pleased...
  7. derpyimp

    Place to sell my core parts

    I have a CV axle and two rear brake calipers that I recently replaced on my car. It seems a shame to throw them out since they should be rebuildable. Does anybody know of a company that might buy these core parts from me?
  8. derpyimp

    Tuning fix for slip-bang from stop?

    I have a 2005 Impala that has the slip-from-a-stop-then-bang-into-gear problem. It has been getting progressively worse over time, until it has gotten to the point where it will do it if I'm at a stop for any more than about five seconds. I have read that this is usually caused by fluid leakage...
  9. derpyimp

    04 GTP questions, seeking mod advice

    Been lurking a long time, time for me to finally post. I picked up a 2004 GTP Competition Group about a month ago and have been doing maintenance and minor repairs in preparation to begin mods. It has 161k miles. I have a mod plan but would like a second opinion since I have the Series III motor...
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