:  : OK, this is the 3rd part of a multi-installment FAQ which I'm writing... for the first two parts, refer to the following posts: : Part 1: Benefits of the System : Part2: Datalogging
: Q: What is full throttle shift?
: By using this option, you can safely keep the gas fully floored during an entire acceleration run... even during the shifts. This is commonly referred to as power shifting. The sequence of events during a run is as follows: : 1) floor gas and keep it floored the whole time
: 2) hit the clutch to shift gears (but again, keep the gas down!)
: 3) the full throttle shift function kicks in, induces a temporary secondary rev limiter (for example, at say 5-6000rpm)
: 4) shift gears
: 5) release the clutch (doing so turns the secondary rev limiter off, and the rev limits return to that imposed by the ECU) : So, basically, you don't have to do anything different from normal shifting except keep your foot in the gas. : Q: What are the benefits of the full throttle shift function? : 1) When power shifting, prevents your engine from overreving if you miss the shift or shift too slowly. : 2) On turbo cars, it ACTIVELY keeps the turbos spooled up. This is much more beneficial than what's seen with blow off valves. When blow off valves activate, you're hoping that the momentum of the turbo wheels to passively keep the turbos spinning. However, due to friction, etc. the turbos are still slowing down between shifts. Now, since your foot is still on the gas and it is hitting the secondary rev limiter, there's a load that is still on the engine and exhaust is still flowing to ACTIVELY spin the turbos. (This is the same way that the launch control option can give you boost before starting.) : 3) You can set the rev limiter so that you can do perfect match shifts (where the rpm of the engine is exactly where it should be at the beginning of the next gear). This prevents that "jolt" you feel as the engine has to rev back up to about 4000rpm (after it has dropped to 2000rpm or so during the shift). Undoubtedly, this will prolong the life of both your engine and clutch since that jarring change in speed does not occur. This is the technique that professional drivers use to maintain smooth lines by not "upsetting" the chassis with a violent gear shift. Here's what Damon DallasZ had to say about this (taken from the installation TECH)... : "There's two ways of configuring this. I choose having a lower rev limiter for the speed shift. I have mine set at a hard cut of 04500rpm and a soft cut of 04250rpm so it will make for near perfect gear speed matches when shifting from redline. The car can be driven almost like an automatic with it set like this." : Q: What the heck is Damon talking about?! Soft cut? Hard cut? : The rev limiter is a TWO step rev limiter, the "soft" rev limit slows the engine down for a brief instant before it hits the "hard" rev limit (which it can't pass). This is much gentler on your engine than if it were to simply slam into a single rev limit. : Q: Will I see any improvement in my times if I use this option? : Testing by Racelogic has shown that up to 0.1 seconds
: can be gained during EACH gear shift! : Q: Will this feature benefit a nonturbo Z as well? : Yes, it will provide the "safety net" benefit of preventing your engine from overreving, as well as the matched shift benefits. :
: Q: Is the rev limiter of the full throttle shift different from the launch control and ECU?
: Yes, there are 3 rev limits that can be utilized here... you set a two-step rev limiter for the launch control (typically about 3-4000rpm) and another two-step rev limiter for the full throttle shift (somewhere between 4-6000rpm). They are both independent of each other and of the rev limiter set in the ECU. : Q: Can I add full throttle shift later if I want? : Yes, like the launch control option, it can be added later, but unfortunately you will have to send the unit back to Racelogic (in England) to have it added. This means that you'll have to pay shipping charges there and back (which can total $70-100), so it's best to get all the options you'll want at the time you purchase your unit. : To participate in the group buy, see details in the Classified post here... Group buy info
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