won't boost over 0.5 bar

I cannot launch my car or drive it hard because the turbo stutters a lot when it reaches 0.5 bar of boost.

I found this thread: http://www.mkivsupra.net/vbb/showthread.php?35931-Misfire-under-boost-(plus-misfire-diagnosis)

I went to a local performance shop that has a lot of experience with Supra's. They told me it most likely it the spark plugs.

Do you guys think this should be the issue from the description I give?

I'm getting them changed tomorrow.

Old plugs could be it, but if it's quite boost-specific it could be your coil pack connectors, or possibly the coil packs themselves. Go for the connectors first - it's obvious if they are breaking down, they are cheap to fix, and it's a fairly common problem as the cars get older.

Old plugs could be it, but if it's quite boost-specific it could be your coil pack connectors, or possibly the coil packs themselves. Go for the connectors first - it's obvious if they are breaking down, they are cheap to fix, and it's a fairly common problem as the cars get older.

as long as its cheap..

I have a lot of other crap that needs to be done.

here is a video of the stutter I am talking about. Listen closely when it reaches 0.5 bar at 0:17... drdrdrdrdrdrdrdrdrdrdr.

ignore the first attempt I shifted too soon.

[video=youtube;o6vqVeWVV-0]http://www.youtube.com/watch?v=o6vqVeWVV-0

Is the engine misfiring whilst on boost? If it is then it's probably an issue with the plugs/coil pack connector(s)/coil pack(s)

If it's not misfiring but just won't boost above 0.5bar then it's either losing pressure due to an intercooler pipe leak or the 2nd turbo is not coming on line properly.

http://www.mkivsupra.net/vbb/showthread.php?35926-The-sequential-system&highlight=sequential

http://www.mkivsupra.net/vbb/showthread.php?35924-Sequential-turbo-hoses&highlight=sequential

http://www.mkivsupra.net/vbb/showthread.php?27904-Sequential-turbo-problems&highlight=sequential

As above. Id say plugs for sure.

misfiring while on boost, correct. It will be boosting just won't go over 0.5 bar like you see in the video above.

if it wasn't midfiring I should of gone much higher into boost but I'm basically cut off.

misfiring while on boost, correct. It will be boosting just won't go over 0.5 bar like you see in the video above.

 

if it wasn't midfiring I should of gone much higher into boost but I'm basically cut off.

In that case I would start by fitting new spark plugs and new coil pack connectors, see threads below.

http://www.mkivsupra.net/vbb/showthread.php?41927-FAQ-Spark-plugs&highlight=coil

http://www.mkivsupra.net/vbb/showthread.php?61141-How-To-Refurbish-coil-pack-connectors&highlight=coil

will get that done tomorrow

thanks

Yeah my coil packs and connectors were bad.

I ordered some online and already have NGK plugs ready to go. I think this should be the issue.

by the way my engine is extremly hot. The temp on the dash is in the middle when hot, and my oil temp is around 110 when hot... also my turbo timer shows the turbo gets up to 63 max. Around 50c on average when hot.

I have to let it sit for 30 minutes before I can actually do anything. Probably 1 hour before it starts to cool down.

I barely nicked my radiator with my finder and got a bad burn. The engine idles at 1,400 - 1,500 on average when hot. Is that normal? the car is BPU only.