General topics » Throttle blip

Right Chaps , can someone please explain this alleged auto blip . If I change down with shift assist , throttle closed , when is this blip supposed to happen ? Let me clarify , I'm in 4th , throttle closed , push lever down ,I'm in 3rd . A throttle blip would mean a surge surely. My rev counter doesn't show a blip , just the revs rising as the lower gear is engaged and the engine turns faster , so what am I missing? Before anyone looks skywards and mumbles "idiot" let me say I always manually blip the throttle on downshifts when using the clutch so understand the principle , and I can double de-clutch a Crash gearbox no problem.

BUT , you are never in a neutral between 2 gears . 4th, then 3rd , with the load off the engine because the ignition is momentarily cut . Is this alleged blip not just unburnt fuel igniting in the exhaust,? if so it's not a blip as I understand it , it's a backfire.

http://www.gelandestrasse.co.uk/2014/11/...ythbusters.html

From late 2014, but sums up GSAP nicely.

Thanks for that ,both of you . My mistake , is doesn't cut the ignition like other systems , it raises the fuelling . It must work , but I can't detect it . Maybe it's my earplugs combined with my tinnitus.

you are riding within the wheel to gearbox matched range the system compares the 2 and will blip the throttle if outside a certain matched parameter. I was able to achieve this on test bike but it felt almost to the point of abuse and of little use on the road and probably better suited to the 4 cylinder XR and to track use.

Its one of the few extra's I paid for and now never use due to the clutch being very light and the general nature of the engine combined with an inconsistency of shift quality that I would rather avoid on a bike I intend to keep long term. Live and learn I guess.

Thanks Ady , I will admit to using huge amounts of mechanical sympathy when riding , some of the things I see and hear sets my teeth on edge. ( people on youtube holding the revs on the rev limiter whilst showing off ) Maybe I need to be more aggressive (or just use the Clutch )

When done manually I think most people blip the engine revs higher than needed to match road speed to the lower gear and then as the revs start to drop back down, slot the gear in when it sounds about right. I think it is easier to time the shift this way than trying to just raise the revs by the exact amount needed, and any inaccuracy is smoothed out by the natural slippage as the clutch re-engages.

The computerised downshift has no need to do this, it knows the exact revs needed and will just raise the engine revs to that point as the clutchless shift occurs and the lower gear engages. What you end up with does not sound like what most people would recognise as a blip.

Zitat von crossthread im Beitrag #1

---

My rev counter doesn't show a blip , just the revs rising as the lower gear is engaged and the engine turns faster

---

Thanks Guys , I obviously misunderstood the term blip , as Fred says ,done manually it's a big overkill handful of revs . I was expecting something similar .

Zitat von Ady im Beitrag #7

---

you are riding within the wheel to gearbox matched range the system compares the 2 and will blip the throttle if outside a certain matched parameter. I was able to achieve this on test bike but it felt almost to the point of abuse and of little use on the road and probably better suited to the 4 cylinder XR and to track use.

Its one of the few extra's I paid for and now never use due to the clutch being very light and the general nature of the engine combined with an inconsistency of shift quality that I would rather avoid on a bike I intend to keep long term. Live and learn I guess.

---

Zitat von runnerhiker im Beitrag #10

---

Zitat von crossthread im Beitrag #1

---

My rev counter doesn't show a blip , just the revs rising as the lower gear is engaged and the engine turns faster

---

First, it's working as it should be so don't worry about it.
Second, to try to understand wha't happening, think of it this way: the ECU is raising the rpm's first, somewhere near the middle of that "blip" it lets the transmission shift one gear lower. This happens in a fraction of a second. But the ECU action on the rpm's has to come first, before the gear change. In your description above, you are seeing the blip (the engine turns faster), it just happens in microseconds.

---

Zitat von Sanemancured im Beitrag #12

---

Zitat von Ady im Beitrag #7

---

you are riding within the wheel to gearbox matched range the system compares the 2 and will blip the throttle if outside a certain matched parameter. I was able to achieve this on test bike but it felt almost to the point of abuse and of little use on the road and probably better suited to the 4 cylinder XR and to track use.

Its one of the few extra's I paid for and now never use due to the clutch being very light and the general nature of the engine combined with an inconsistency of shift quality that I would rather avoid on a bike I intend to keep long term. Live and learn I guess.

---

That pretty much sums up my feelings. The only time I use it routinely is when overtaking after I pass the vehicle I'm overtaking. I use it to check it still works occasionally.

---

in that brief time between gears, it really does not seem possible that engine revs can
be increased fully to match what will soon be the native rpm in the new gear.

new porsche 911 three pedal cars do this as well. and the rev matching on the down shift is
extremely obvious and allows for perfect shifts..