Thursday, May 06, 2010 - 09:11 am, by: Jack Dean(Blackhander)
I'm getting a slight shudder when I back off the accelerator.
Specs as follows: 1JZ vvti single turbo (CT15b) 3.5" dump, trust FMIC, APEXi power FC and Blitz SEBC, R154 manual
It started happening last weekend when I had the EBC fitted and Power FC tuned (first tune).
Tuner didnt notice anything wrong except that the EBC wouldnt hold boost it just kept boosting higher than what we set it too. Didnt have the manual for the EBC so not sure if set up properly, therefore disconnected the black box for the EBC and left the rest of the EBC hooked up. EBC Seems to be work ok displays boost when driving.
OK so problem is when I accelerate and even slight boost comes on, then i back off the accelerator i get a slight shudder. Doesnt happen if I keep on the accelerator and/or change up a gear. Doesnt happen at low speeds either.
So Im thinking it might be something to do with the wastegate actuator but im not sure, any ideas?