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Rev Limit Option
How exactly do you set-up and use the rev limiter function besides setting the rpm on the Microtech.
Is there a switch that I have to wire maybe from the AUX of the Microtech? |
yes you can set a AUX rev limit by using the aux in wire, you set the revlimit in the aux screens and when you earth the wire that limit comes into effect.
Dale |
Aren't the rev limiters fuel based? I thought that was bad for rotaries...
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its only bad if you cut one bank of injectors, if you cut all fuel it is fine
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DO NOT..............................
Set the rpm limit on a 13b turbo engine or any other engine that runs a primary & secondary injector bank. Run the rev cut only Rpm lim will cut one of the injector banks out which will lead to a major lean out. The rev cut will cut all fuel out together so there isn't a problem |
Let's say we need a rev limit around 5000rpm to launch a car, So then on a rotary you need to set the rev limit and the rev cut together or just the the rev cut? or do we just launch manually without a rev limiter?
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i need to know this too, i'm doing this soon cuz i can't launch for shit. i think it's better to CUT if your doing a launch one because at 5000 your secondary injectors are running along with your primaries and if you LIMIT one of the injector a rotor would be blasted.
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What you guys are thinking of is two-step rev limit functionality, which the LT8 can't do. The only thing the LT8 can do is a fuel cut, similar to the stock TII boost cut.
Brandon BR7 Racing |
What about the LTX-12 can that do it (two-step rev limit functionality) or is it the same as the Lt8?
What about using an MSD two-step would that work better for launching? |
WHAT THE F***! i was in the microtech group buy shit and they said it's possible to do two-step rev limit!! so you guys were liying to me? WTF!!!!!!!!!!!!!!
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--- Dale Heiler <DHeiler@toshiba-tap.com> wrote: > Yes you can hook up a secondary rev limit switch to > the aux input and set a > rev limit through the software > > Dale |
yes it can be done!!!!!!! and very easy to do!!!!!
you need to hook up the aux input wire to a switch and earth the other side of the switch, the in your aux setup there is a rev cut option in there, set this to where you want and when you hit the button this will become active! you can hook it to your clutch as well for flat shift up changes, |
600 HP:
Chill out, dude. :) There's a difference between a rev limit and a rev cut. A two step functions by alternately dropping injector and ingition coil firings. This is what you see DSMs and Supras do all the time. That's what is called a "rev limit" or a "soft limit" - the engine's still running, but the revs won't climb. You can, however, set up a hard "rev cut". This works by cutting all fuel - it shuts off the injectors completely. This limits fuel, but is dangerous under boost, especially in a rotary. Its effect is also a LOT more sudden than a soft limit. The LT8 does the second; not the first. Nobody lied, it was simply me and Dale using different terminology. Read Dale's descriptions, and you'll find it's exactly what I've described here. Brandon BR7 Racing |
600 HP, if you wanted the fancy features you should have been ready to pony up for a fancier ECU.
Anyways, you don't need that, you're not in pro drag. Buy an MSD box that does it if it's that big of a deal to you. |
Guys,
read what is written, YOU CAN SETUP A 2 STEP!!! USE THE AUX INPUT WIRE, SET THE REV LIMIT IN THE AUX SCREEN AND YOU HAVE A 2 STEP! Dale |
but we can't use REV LIMIT, 10sec rx7.. - said rxeng
and in the AUX section there isn't a REVCUT, and in the book it says it's good if i use revcut and limit and ignition "thing" to retard while it's rev-limiting. sorry to sound too crazy i was just messing around. |
i dont have a manual infront of me, ill fire up my ecu on the ski boat when i get home and have a look,
i was told by Anthony R that you can use this, so im asuming that it cuts all fuel , |
from help file.
Example 2: Connect a (earth) switch to the Aux Input, and set a limit figure in the InpRPMlim screen and use the InpTiming screen to retard the timing slightly: when the button is pressed, the engine will be limited to this rpm figure, and the timing retarded (to prevent detonation. Releasing the button will deactivate the rev limiter and return the timing to its’ normal value, allowing the engine to instantly produce full power. This way you can very easily use the Aux Input to set up a basic “two-step”. REVcut This is a "hard cut" rev limiter. The MT ECU will cut off all fuel supply when the engine reaches the speed set in the REVcut option, effectively shutting the engine down. If you do not wish to use the REVcut option, set this value above the maximum possible speed of the engine. NOTE: using REVcut together with the REVlim option allows you to set up a very effective two stage rev limiter system, e.g.; if you set REVlim at 5500rpm and REVcut at 6000rpm, you eliminate the coarse action usually attributed to rev limiters. As the limiters come into effect more "softly", high speed gear shifting becomes easier, and the engine loses less power because it is not "bouncing" between on and off. REVlim NOTE: DO NOT use this option on staged injector set-ups This is a "soft cut" rev limiter. The MT ECU will cut half of the injector banks out when the engine reaches the speed you set in the REVlim screen, halving the fuel supply to the engine. Halving the fuel flow rather than cutting it off completely causes less stress to the engine. DO NOT use this option on staged injector set-ups, since in this case it is only the primary injector bank which is cut; the secondary bank will continue to fire, allowing the engine to run on in a dangerous lean-out condition; use the REVcut option instead. If you do not wish to use the REVlim option, set this value above the maximum possible speed of the engine. FOR THIS, i just left it off |
They both sound bad to me. I don't see how just cutting a bank of injectors won't cause a lean condition, even momentarily. If it cut spark that'd be a different story.
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As I understand it, the InpRPMLim function activates the REVlim function - i.e. cuts fuel in the "bad way".
I'll defer to Dale's experience, however. Brandon BR7 Racing |
I cant find any hard evedience that it cuts all injectors, ill have to do some testing
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if this don't work, imma just get MSD 6AL, seems like cutting the ignition is more safer than cutting a bunch of fuel.
i used rev limit at 7280, because i misshifted the other day and it rev like crazy so to be on the safe side the used the "hard cut" to protect myself from over revving. |
I shifted at about 7500 today and it felt pretty good :D
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yeah it does feel good but isn't good for the engine to rev pass 7500! or even 7000! for that matter, plus i'm not street port, so i looz hp going near there.
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i rev my motor to over 9000!!!
but with a stock turbo they run out of puff at about 6500 so no point really |
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