Originally posted by PHiZ
I think i've heard mentions of setups, where ppl will spray nitrous, for low end torque, until the turbo spools, and then takes over for the upper revs, anyone heard this?
This is done all the time to help spool a turbo. The added heat generated by a nitrous burn helps make enough extra exhaust energy to build boost earlier than it would unassisted. Of course, with a proper sized street turbo tuned for high power, you'll build too much power for the amount of traction you usually have anyways...
And what's the deal with sequential turboes. I think, one is calibrated to spool low RPM, and the other at high. However, when the high rpm is spooled, I would imagine the low-rpm turbo is causing an air restriction... I can only imagine they are a bitch to tune....
The way sequential turbos are normally plumbed, the smaller turbo usually is a restriction, but not so noticable that it kills it's purpose. Of course, with advances in turbo shaft bearings and such, sequential and twin turbo setups are largely pointless. Sequential turbo setups are better left for bi-turbo Maserati street cars and the like from the early 80's and before.