Home of The Shuttle...
Home The Cars The Humor Contact Me
Chris' '90 Toyota Celica
Autronic SMC Feature: Flat Shift
|Updated: September 25, 2017
Problem: Increased performance by decreasing the latency between full-throttle and achieving full boost. At present, it takes about .25 - .3 seconds to regain full boost after each shift. This delay is clearly observable via the SMC data log And, considering there are three shifts in the 1/4 mile, I can decrease my 1/4 mile time-slips by simply regaining boost quicker after each shift. Some people use a boost-controlled shot of nitrous to quickly regain boost pressure, and this certainly works well. However, before resorting to using nitrous between each gear, I am implementing a feature of the Autronic SMC called Flat Shift, and it works like this.
Solution: A momentary switch is installed such that it makes when the clutch is depressed. This signals the SMC that a gear-change is occurring. When the SMC sees this switch go active with TPS indicating 100% throttle (i.e. the foot is still planted to the floor), the SMC engages a mode very similar to a very mild anti-lag, in that it keeps the turbo spooled while simultaneously preventing runaway engine speed. So, once the gear-change occurs and the clutch is lifted, the engine resumes normal operation, and boost pressure is not lost. That's the theory.
Road Test: OMG, this is this sh!t! Running 1.0 bar, boost drops to about .85-.9 bar during the shift but immediately resumes 1.0 bar after the shift. No more waiting for boost to rebuild. And, while I used to occasionally chirp the tires in 2nd gear, now they are more like howling on the 1-2 shift. This is awesome.
|This site is best viewed at 1024x768. All information provided on www.turbocelica.com is provided without any expressed or implied warranty. It is the responsibility of each visitor to determine the suitability of this information for your specific application.