sprint booster
- Thread starter gho888
- Start date
I had a sprint booster on my E46. I have also read a lot of research which suggests it really doesnt do a lot except open up the throttle more. it gives you the feeling of being more responsive, but in actual fact you may as well just squeeze the throttle harder, or something like that.
Hit the sport button, works well enough for me in the Z4, sharpens it up to the point the SB did in the E46.
Hit the sport button, works well enough for me in the Z4, sharpens it up to the point the SB did in the E46.
I think it has pretty much identical effect to pressing the sport button. If you have that already, then not worth the investment IMHO. that said it woudl be interesting to hear if anyone who has sport and fitted one can confirm any incremental difference
They just make the throttle input a large deflection to the ECU for any given input vs standard.
So 50% throttle stock might = 50% demand normally, and this just makes it see 70% demand.
The downside is that when it gets to say 75% input, any more change makes no difference, so you just get dead throttle zone.
I'm not sure what the point is. In my experience you want MORE travel not less. Less travel makes cruising at constant speeds in low gears very difficult.
I imagine the sports button makes many more changes, it will likely change the throttle mapping, but will change lots of other engine maps too for faster actual engine response to input, throttle plate rate of opening on sense of input and smoothing of that action etc...
Dave
So 50% throttle stock might = 50% demand normally, and this just makes it see 70% demand.
The downside is that when it gets to say 75% input, any more change makes no difference, so you just get dead throttle zone.
I'm not sure what the point is. In my experience you want MORE travel not less. Less travel makes cruising at constant speeds in low gears very difficult.
I imagine the sports button makes many more changes, it will likely change the throttle mapping, but will change lots of other engine maps too for faster actual engine response to input, throttle plate rate of opening on sense of input and smoothing of that action etc...
Dave
That would be my understanding and agree that simply increasing the deflection at any given pedalposition is of no value. At least the sport button makes many other changes that add value (well documented elsewhere).
I also agree that most of the time more pedal movement is best to allow better control across the range. On off roaders they often go the opposite way to sprint booster to allow full control over rough terrain.
I could only see the benefit of the sprint booster if it could somehow decrease the time for the signal from pedal depression to ECU response, but that's speculation that it could really do that??
I also agree that most of the time more pedal movement is best to allow better control across the range. On off roaders they often go the opposite way to sprint booster to allow full control over rough terrain.
I could only see the benefit of the sprint booster if it could somehow decrease the time for the signal from pedal depression to ECU response, but that's speculation that it could really do that??
Don't know about this booster thing but I have one of these on my current car (not a Z) and it does actually make quite a big a difference to throttle response and a slight improvement in acceleration...
http://www.ecotekplc.com/CB-26P.htm
Don't think it has really improved MPG though.
They are 50 quid from demon tweeks but I think you need 2 of them in series for engines over 2200cc. Piece of piss to fit too.
http://www.ecotekplc.com/CB-26P.htm
Don't think it has really improved MPG though.
They are 50 quid from demon tweeks but I think you need 2 of them in series for engines over 2200cc. Piece of piss to fit too.
cj10jeeper said:
It can't do that in itself.
The ECU knows no different, it can't. It see's a signal for deflection and that is it.
If it see's a faster deflection it may well respond faster via a map, assuming that your fast input means you want maximum response, so in theory it is doing it, but you could do the same just opening the throttle faster anyway.
Most cars have something called 'drivers wish' which is a topographic map thus:
It might be different on the Z axis for petrol of course, but the rest is the same, throttle input (0-100% (converted from the actual signal, so this sprint booster would just send you to 100% sooner with a smaller throttle input)) vs rpm, and the Z axis is essentially driver demand.
There *might* be maps that look at rate of change of throttle input, and then react more or less quickly to the command, but it's more likely that those maps look at rate of change of drivers wish/demand and respond to that.
Dave
biffa said:
Hmm, their test data is all on (what I can tell) older throttle cable > body operated engines in the 1.1 > 1.4 litre capacity range, and conduted and overseen by the same person, who runs the company.
It looks promising, but only two runs before/after does not a very good trend show, and without showing some datalogging of the throttle input we just don't know if he is a tad slower to get back on the throttle between different tests, or if the gearchanges are slower, or what.
Demon tweeks will sell them for £50, and will likely buy them for £10, and if you could get such gains so easily BMW would have them fitted as standard for £5 to their costs...!
I know I sound really pessimistic here, but there really isn't that much for free on modern engines! All these trinkets and optimisations have been poured over with millions in development over many years!
Dave
gho888 said:
The only one that will really benefit is a remap, but even them I'm skeptical a tuner can find THAT much on a standard engine.
Optimised exhaust and sporty cats (not sure what the Z4's have as standard, looks like cats built into the manifolds so not cheap to change) would get you 10-15bhp...
Check ESS's website. They are hugely experienced and the best they can offer is about 4bhp with a remap, about 20bhp with a remap and sports exhaust (on the 3.0i)
Dave
Dave
Interesting map you put up there. Confirms many of my longstanding feelings about this sort of thing and agree that generally there is nothing for free. Manufacturers spend billions to get performance, economy, etc. from cars so no box of electonic fooling an ECU input is really going to benefit anything.
Remaps can work by pushing the envelope a little as manufacturers have to build cars to suit a huge range of fuel (grade and quality), driving conditions and styles and also keep the engine running for 100,000+ miles. Good one's seem a lot of money for what you get at the wheel. BMW exhausts are really well sorted so changing is likely just for a different note, not really power gains
anyway on topic I'm sure I can replicate any sprint master by burying the throttle in the carpet, but perhaps Corsa tuners feel they have a more powerful and responsive car as the engine revs if they so much as wiggle their toes.
Interesting map you put up there. Confirms many of my longstanding feelings about this sort of thing and agree that generally there is nothing for free. Manufacturers spend billions to get performance, economy, etc. from cars so no box of electonic fooling an ECU input is really going to benefit anything.
Remaps can work by pushing the envelope a little as manufacturers have to build cars to suit a huge range of fuel (grade and quality), driving conditions and styles and also keep the engine running for 100,000+ miles. Good one's seem a lot of money for what you get at the wheel. BMW exhausts are really well sorted so changing is likely just for a different note, not really power gains
anyway on topic I'm sure I can replicate any sprint master by burying the throttle in the carpet, but perhaps Corsa tuners feel they have a more powerful and responsive car as the engine revs if they so much as wiggle their toes.