I ahve experienced the same bog when the car is cold. Once it warms a little everything is fine.What is the recommended spark plug and gap for this tune? Will the "hotter" 08 plug cause issues with the higher boost? I haven't checked to see which plug is installed in my car yet, but I expect it is the AC Delco 41-102 because whent the engine is cold, I experience a bog-down(hesitation) with the engine with about 1/2 throttle. Maybe I just need to regap the factory plugs?
I just changed mine for the same issue. It was the AC Delco 41-102 from the factory. I went with the 2008 plugs which are hotter and it has solved my misfire issues. I gapped mine at .028.What is the recommended spark plug and gap for this tune? Will the "hotter" 08 plug cause issues with the higher boost? I haven't checked to see which plug is installed in my car yet, but I expect it is the AC Delco 41-102 because whent the engine is cold, I experience a bog-down(hesitation) with the engine with about 1/2 throttle. Maybe I just need to regap the factory plugs?
Let me know if your issue was the same as mine - until the coolant hits 135 degrees, the turbo will start to spool up, but the car bogs down. If I let off the throttle, everything "catches" all at once like I just dumped the clutch. If I really ease into the throttle, I can usually get the car to walk up the RPMs and not bog down.I just changed mine for the same issue. It was the AC Delco 41-102 from the factory. I went with the 2008 plugs which are hotter and it has solved my misfire issues. I gapped mine at .028.
The problem is I don't try to ramp up the boost. Under normal light acceleration the car will act like you have a boat behind it, spin up the turbo, and if you don't completely back off the gas, it will catch like you dumped the clutch. But it only happens when the car is under about 135 degrees.I don't think we have the exact same symptoms but very similar. I never really tried to ramp up my boost till the engine was warmed up to ~180+. My symptom was a big bog between shifts when WOT. The bog was caused by a misfire in one of my cylinders. If you have the AC Delco 41-102 plugs in the car, I would change them anyway and see if it helps. Most people that have changed the plugs have reported drivability improvements in one form or another.
You are right, it is not that big of a deal and it is not like I am out racing a cold engine. However, I do live on a main road and occasionally when I pull into traffic, I don't have the option to drive 10 mph until the car wants to go. Also, I generally don't like to sit in a cold car for 5 minutes after something like a movie when it is 10 degrees outside - so it also becomes an issue in those times.My car does this as well, but it is a 2008. It isn't too big of a deal; you just let the car warm up a bit and then ease into the boost. You shouldn’t be making a lot of boost on a cold engine and turbo anyway.
It feels like the Computer is trying to heat up the cat by managing the throttle/boost. Just chill for a little bit and let the car heat up before you get on it. The only trouble code I've seen with my car was a misfire code that came up after I goosed it when I should have waited for the engine to heat up.
PCM has a terrific product - I am just saying they need to look at this one issue. No one has any idea if it could be causing other problems. They have a terrific product and excellent service - and I do recommend them to everyone. But if the tune has a problem, it has a problem. I bought in when they first announced support for the solstice and there was an issue with the cruise control. I shipped my ECM back to Bryan and he fixed the problem that same weekend. I can accept problem with a product launch - if they are addressed. Now, enough cars have their tune now and it is obvious this is not an isolated issue. Time for a solution.I'm sure there is some give and take for your custom tune. For example you get rid of the stock tune that was preventing full throttle upshifts but now you have an overly aggressive throttle on warm up. You dug one hole to fill another.
As far as I know PCM's tune is getting the best power gains at the wheels. Maybe they pushed the tune a bit futher and the annoying throttle/boost we're getting on start up is a product of the bigger torque gains you get with this tune?
You can always upgrade to the Stage II tune for a bit less power but better cold start manners.