View Single Post
RClewett RClewett is offline
Registered User
Join Date: Apr 2010
Location: California
Posts: 15
It's clear that there is a problem here. The MAP sensor is not correct for the boost. The problem is the boost is at 22 PSI ( 1.5 bar) and the timing MAP is only going to 208 (1 bar). If the timing map were scaled for a 3 bar MAP sensor it would be a conservative table.

Solution, put in a 3 bar sensor and rescale the timing MAP. At this time you can optimize your timing.

The timing numbers mentioned earlier in this thread are OK if you want snappy don't mind rebuilding your engine all the time. The goal with ignition timing is to have peak cylinder pressure 14 degrees ATDC. Peak pressure before that time is trying to push the heads off the engine, beating up rings, rods and bearings. If the peak pressure is later than 14 degrees ATDC, you could be leaving power on the table.

There is a good book called Maximum Boost by Corky Bell. It has a lot of good information on setting up turbo systems. This is one of the many topics in the book. It is worth reading if you are going to be playing with turbo systems.

Old 04-25-2010, 07:18 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #38 (permalink)