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I was shifting like Ricky Bobby today in my 2005 M6 and I think I got a little carried away. Dropped from 3rd to 2nd at around 50mph (I rev matched) to go for a nice drag pull, and as soon as it went into gear and the rpms spiked, the car shut off. DIC said something like “check electrical system” as it was shutting off. It will now turn over, but won’t start. I got a P0340 code, cam position sensor. Did I jump my timing chain?
pretty good chance if you broke your timing chain that you have several if not all your valves bent from contact with the pistons. I've had a similar experience. Kinda sucks.
Good luck, Stafford
so -- any suggestions on some bulletproofing / go fast mods while I have this thing torn apart? I don't want to spend a ton of money but might as well throw some new parts in while it's torn down. Definitely putting a new cam in
so -- any suggestions on some bulletproofing / go fast mods while I have this thing torn apart? I don't want to spend a ton of money but might as well throw some new parts in while it's torn down. Definitely putting a new cam in
Lots of suggestions. How much $$ and time you got
First, I'd dump that under-drive pulley. Since you are in there to replace the timing chain, you could invest in a cam kit. Other than that, you aren't doing much more unless you add a power adder or pull the motor for a (re)build.
so -- any suggestions on some bulletproofing / go fast mods while I have this thing torn apart? I don't want to spend a ton of money but might as well throw some new parts in while it's torn down. Definitely putting a new cam in
If the valves are bent and heads are pulled, look for a set of LS3 heads and intake. Put rods in the intake and port match it to the heads since they will be off the car and easy to work with. Due to the crappy nature of the LS2 intake, the switch to the LS3 will get you a minimum of 30 Hp and 30 TQ if you cam the car.
Match your cam grind to the LS3 heads. With a a smaller cam (no fly cutting) you can easily end up around 460 RWHP for not a lot of extra coin by using the LS3 heads & intake. You can fly cut if you want a more aggressive cam and/or bump the compression to target 480+ RWHP.
Lots of suggestions. How much $$ and time you got
First, I'd dump that under-drive pulley. Since you are in there to replace the timing chain, you could invest in a cam kit. Other than that, you aren't doing much more unless you add a power adder or pull the motor for a (re)build.
Trying to stay under $3k or so for parts (keep in mind I may have some damaged internals). I'll be doing the work myself and time really isn't an issue, but I won't be pulling the motor unless I have to for some reason. So are there any other easy bulletproofing upgrades I can take care of while I'm in there? or supporting mods for the cam?
The smaller the damper the less damping effect it has on the engine components hence the extra stress. Hence why ATI really doesn't like making stuff more than 10% under. However even their UD version is better than the one one so if you have an ATI I wouldn't switch at all. Now if you have like a 25% PowerBond or something that's different
Update: pulled the heads and I've got impacted pistons. I'm pretty mechanically inclined but I don't know a lot about engine building. With the help of a more knowledgeable friend, we're going to replace the heads, cams, timing chain, timing gear, valves, and pushrods. What exactly needs done to replace the pistons? Do I need to pull the entire block and send it to a machine shop? And if so, what would the machine shop be doing and how much should I expect it to cost?
I'd suggest an LS3 crate motor (480hp or 520hp variant,) or at least a used junkyard LS3 or maybe a L92 truck motor, and then you can pull your current motor, and either salvage what you can, or rebuild it and sell it to recoup the investment into your existing LS2.
10-10-2018, 09:36 PM
Hard downshift killed it..
