GreenDieselEngineering wrote:A larger turbo frameset will most likely be too big for the 2.8l engine. With the higher inertia, the lag in building low end boost will increase. No need for extra air flow at the higher rpm range as the cylinder head is flow limited above 3600rpm. A port job would help this out, but the wall thickness would be reduced too much and potentially lead to premature head cracks. With the limitation in cylinder head flow, the smaller frame turbo GT1756 provides quicker response at low rpm and more flow at higher rpm as the bearings can handle an extra 30,000rpm over the stock turbo. GDE
Thank you for the response
I am looking forward to getting your PCM, and TCM tunes, and maybe even the turbo kit.
My understanding is that the NVT3 series like you are using on the GTB1756 has more flow than the previous generations, quicker spool, and less exhaust restriction.
That's why I was thinking that going to the next size turbo but going from GTA aka VNT2 series to GTB but larger would yield about the same boost lag but more flow overall.
I'm tempted to get one and try it out to be a guinea pig LOL
Could you support such a tune?
Thanks you guys are great!