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Performance MODS for the R171 Tuning and Performance modifications for your SLK

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#1 Old 02-06-2014
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Question Sprint Booster

Hi, Ive just purchased a sprint booster, will be installing this weekend, looking forward to it, I have a question: when it is installed can you change betwen the 3 stages whilst driving, or do you have t shut the engine down first?
Any advise would be much appreciated.
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#2 Old 02-06-2014
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I fitted a sprint booster to my r172 last week and I have had no problems changing mode whilst on the move - I just come of the throttle before changing.

http://www.sprintbooster.com/faqs.asp?menu=0

Quote:
11. Can I change mode by pressing the switch while driving?
Yes the driver can change mode anytime , even while driving although we strongly suggest to avoid changing modes when the accelerator pedal is depressed as the behavior of the car instantly changes.

Gone: SLK 55 AMG (2013) Iridium Silver / Bengal Red / Black Ash
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#3 Old 02-06-2014
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Thanks for the quick response, how is the sprint booster are you pleased with it?
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#4 Old 02-06-2014
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I love it. It really transforms the feel of the car for me.

Car manufacturers have a whole heap of considerations when choosing things like throttle maps for their cars, and these days it seems to be as much about avoiding legal action as anything else, so they dumb things down.

It doesn't impact the ability to modulate the throttle, but it provides a sharper response - just makes everything feel faster and more connected.

I did post a thread about my install here:

https://www.slkworld.com/amgs/123474-...lk-55-amg.html

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#5 Old 02-10-2014
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Hi again, Sprint Booster all installed, took about 5 min to install, what a difference it makes, it brings the car alive, responds alot quicker in 'Green mode' and as for 'RED mode' wow! along with the smart top this is a mod that has to be done.
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#6 Old 02-10-2014
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Sounds good, so what mode do you keep it in?

Does it suit a daily drive?
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#7 Old 02-10-2014
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Originally Posted by randombloke View Post
I love it. It really transforms the feel of the car for me.

Car manufacturers have a whole heap of considerations when choosing things like throttle maps for their cars, and these days it seems to be as much about avoiding legal action as anything else, so they dumb things down.

It doesn't impact the ability to modulate the throttle, but it provides a sharper response - just makes everything feel faster and more connected.

I did post a thread about my install here:

https://www.slkworld.com/amgs/123474-...lk-55-amg.html

Don't you find you just light up your tyres more than usual, or does its effect feel more noticeable once you are rolling?

How about backing into tight parking spots - brown trousers?

I'd love to try one before buying.

Oh, and what do insurance companies say about them?
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#8 Old 02-11-2014
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I have it set to 'green' mode for every day driving, works fine around town, have no problem reversing into tight spaces. Although it did bounce off the rev limiter this morning pulling out of a junction, it was as if the gearbox (auto) couldn't keep up with the increase in revs, but I did give it a good bootful!As for the insurance I haven't told them, from what other people say they don't need to know as it doesn't actually change anything on the car, it only makes the throttle response quicker, reduces the pedal travel to get to full throttle.
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#9 Old 02-11-2014
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Originally Posted by Daveslk View Post
I have it set to 'green' mode for every day driving, works fine around town, have no problem reversing into tight spaces. Although it did bounce off the rev limiter this morning pulling out of a junction, it was as if the gearbox (auto) couldn't keep up with the increase in revs, but I did give it a good bootful!As for the insurance I haven't told them, from what other people say they don't need to know as it doesn't actually change anything on the car, it only makes the throttle response quicker, reduces the pedal travel to get to full throttle.
Well some chaps on a Bimmer forum I was reading state that 2 claims have been refused due to the undeclared mod - but of course that could just be chinese whispers.
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#10 Old 02-11-2014
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Quote:
Originally Posted by Deafy View Post
Don't you find you just light up your tyres more than usual, or does its effect feel more noticeable once you are rolling?

How about backing into tight parking spots - brown trousers?

I'd love to try one before buying.
You can still modulate the throttle with it, you just hit higher revs quicker - it doesn't make the throttle pedal feel like an on/off switch. In every situation other than planting your foot to the floor, it feels more eager as it is sending a different throttle pedal position than it would stock.

Quote:
Oh, and what do insurance companies say about them?
The blurb I've read for it from the seller and elsewhere says that it does not affect insurance:

http://www.profusioncustoms.com/sprint-booster/

Quote:
Once fitted Sprint Booster does not affect your insurance or MOT certification.
(added: I contacted the supplier and they've removed that wording pending confirmation)

but I just called my broker and informed them and after speaking with Avia who insure my car, my premium has just gone up 10% as they are averse to changes. I understand that different insurers react differently to this, but I think it's sensible to tell them.

Gone: SLK 55 AMG (2013) Iridium Silver / Bengal Red / Black Ash

Last edited by randombloke; 02-11-2014 at 08:45 AM.
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#11 Old 02-11-2014
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Originally Posted by randombloke View Post
You can still modulate the throttle with it, you just hit higher revs quicker - it doesn't make the throttle pedal feel like an on/off switch. In every situation other than planting your foot to the floor, it feels more eager as it is sending a different throttle pedal position than it would stock.



The blurb I've read for it from the seller and elsewhere says that it does not affect insurance:

http://www.profusioncustoms.com/sprint-booster/



(added: I contacted the supplier and they've removed that wording pending confirmation)

but I just called my broker and informed them and after speaking with Avia who insure my car, my premium has just gone up 10% as they are averse to changes. I understand that different insurers react differently to this, but I think it's sensible to tell them.
Thanks - that's useful info. I'm with Aviva too!
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#12 Old 02-12-2014
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I love the sprint booster, I drive all the time on RED, is there another way? response time is much better and makes the car more fun to drive.
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#13 Old 02-12-2014
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I haven't had chance to drive mine all that much - but I tend to prefer the extra modulation that green gives.

These days I am driving mostly in M rather than range limiting in S - but I think both of those already run a tighter stock throttle map, so the SB would be improving on that higher base.

Might be a different experience in the 350 vs the 55 though.

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