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RSRs - any downsides?



I'll see your video and raise you this one Goose old boy.

Never been an RSR fan, especially when these cost £90.
 
Kim ....... where did you get that "air-cooled" sticker that is shown in the last frame? ...... I want one ....... :)
 
Hey, you must be mellowing in your old age. I was expecting abuse :thumb:


The sticker was from somewhere on Ebay.
 
I will see if I can find one Kim ........ abuse ....... moi ....... :hand: ...... :wack: ........ :lol:

Just to add ....... RSRs make a 993 sound as it should have sounded when it first left the factory ....... :thumbs: ......... 8)

But it is all a matter of opinion and my opinion is certainly not definitive on how a 993 should sound....... :)

:?:
 
Tobesetc said:
I don't think you are "over thinking". In principle, if the RSR exhaust is significantly different to the exhaust that was on when you remapped, then it would need remapping, I think/agree. However, I've no idea if there is a significant difference! Others will offer better informed opinions, I'm sure.

FYI I also had mine done by Wayne (Fabspeed exhaust/cat).
Click to expand...

+1, get your RSR exhaust boxes by a proper engineering / exhaust specialist in the UK

so you won't loose any net mid range power against other performance improvements to those sold from the EU will result in, it is a marginal net loose but it all makes a difference
 
Kimbo said:


I'll see your video and raise you this one Goose old boy.

Never been an RSR fan, especially when these cost £90.
Click to expand...



Is that standard ?

Cant hear it ! :p
 
911UK said:
Tobesetc said:
I don't think you are "over thinking". In principle, if the RSR exhaust is significantly different to the exhaust that was on when you remapped, then it would need remapping, I think/agree. However, I've no idea if there is a significant difference! Others will offer better informed opinions, I'm sure.

FYI I also had mine done by Wayne (Fabspeed exhaust/cat).
Click to expand...

+1, get your RSR exhaust boxes by a proper engineering / exhaust specialist in the UK

so you won't loose any mid range power that those sold from the EU will result in, it is a marginal loose but it all makes a difference
Click to expand...

Who would you recommend then? I would have thought that Gert (or Robin Sun, the inventor in the US) were the experts at converting stock boxes into RSRs given the number they have done. What is a "proper engineering/exhaust specialist in the UK" and why would they necessarily be better than "Johnnie foreigner?" Doesn't make sense to me.
 
Cheshire cat said:
911UK said:
Tobesetc said:
I don't think you are "over thinking". In principle, if the RSR exhaust is significantly different to the exhaust that was on when you remapped, then it would need remapping, I think/agree. However, I've no idea if there is a significant difference! Others will offer better informed opinions, I'm sure.

FYI I also had mine done by Wayne (Fabspeed exhaust/cat).
Click to expand...

+1, get your RSR exhaust boxes by a proper engineering / exhaust specialist in the UK

so you won't loose any mid range power that those sold from the EU will result in, it is a marginal loose but it all makes a difference
Click to expand...

Who would you recommend then? I would have thought that Gert (or Robin Sun, the inventor in the US) were the experts at converting stock boxes into RSRs given the number they have done. What is a "proper engineering/exhaust specialist in the UK" and why would they necessarily be better than "Johnnie foreigner?" Doesn't make sense to me.
Click to expand...

There are different ways of producing more sound,

All Gert does is remove all the packing and cut the internals out leaving just two stubby pipes 100mm long into an empty canister. Weld's them back up and it's all done. It's not technical - just cut up carve! Unfortunately although this is the quickest and cheapest way to achieve the sound improvement it is at the expense of some torque that would otherwise be achieved with a better solution.

For example, There these better solutions that can be done by reinstalling the Bellmouth on the outlet pipe to improve the flow.

We did a group buy with Powerspeed 2 years ago where they were using an improved design, maybe worth giving them a call or ask Wayne or 9m to create a set.
 
Thank you for expanding on your earlier post. In all the replies to my original question you are the first to state that RSRs do sap some torque from the engine, which is what I was trying to understand in the first place. Does any one know how much? Has this been measured or is this all just hearsay using the "butt dyno" as our colonial cousins like to call it? Is it enough to cause a flat spot during acceleration for instance?

It isn't difficult to see how increasing flow through the boxes by removing restrictions aids engine breathing at higher revs and could also affect torque lower down. What is strange, if this reduction in torque is sufficiently significant to make a difference, is that nobody who has RSRs fitted has commented on it. I have never read a review from a customer on Gert or Robin Sun's websites that give this subject even a passing mention. What is not in doubt is that to most people's ears, fitting RSR modified boxes improves the sound of the car - "it's how they should have sounded from the factory" is often what people say - and I want some of that for my car.

Having read all the positive "just do it" responses earlier in the thread I had made up my mind to buy some and take the chance. Now I'm not so sure.
 
I got mine from Gert ......... I went there and had them fitted ....... did I notice any difference in torque? ...... not in the slightest ..... I am not saying there isn't any loss of torque but you certainly won't notice it ........ well at least not on a non vario engine ........ :)

Will ....... you are a star ....... thanks for the link ....... :)
 
I would think that any silencer box modification would have marginal impact on power/torque, certainly not to the point whereby you would notice any real difference from the drivers seat.

If there were any flat-spots then this could be dialled out by the likes of Wayne with a remap.

So far as loudness, I guess it's all about opinions really. I am running 200cell cats and the silencer bypass (both by Powerspeed) along with the remap. I think the car sounds fantastic but some might say it is a tad loud....

CC, from your user name I guess that geographically we are not a million miles apart so would be happy to meet up for a 'listen' if interested. Although I think from what you have already said that my car would perhaps be a little loud for your taste. :D

Cheers
 
Cheshire cat said:
Thank you for expanding on your earlier post. In all the replies to my original question you are the first to state that RSRs do sap some torque from the engine, which is what I was trying to understand in the first place. Does any one know how much? Has this been measured or is this all just hearsay using the "butt dyno" as our colonial cousins like to call it? Is it enough to cause a flat spot during acceleration for instance?

It isn't difficult to see how increasing flow through the boxes by removing restrictions aids engine breathing at higher revs and could also affect torque lower down. What is strange, if this reduction in torque is sufficiently significant to make a difference, is that nobody who has RSRs fitted has commented on it. I have never read a review from a customer on Gert or Robin Sun's websites that give this subject even a passing mention. What is not in doubt is that to most people's ears, fitting RSR modified boxes improves the sound of the car - "it's how they should have sounded from the factory" is often what people say - and I want some of that for my car.

Having read all the positive "just do it" responses earlier in the thread I had made up my mind to buy some and take the chance. Now I'm not so sure.
Click to expand...

Not exactly from what I said, fitting a performance exhaust is always a good way to improve engine performance, the RSR has no real performance gain, to what you could achieve with performance boxes or if there is any gain then there will be a loss against what could otherwise be expected.
 
I'm not looking for a power increase - I already have 300 BHP after my Wayne remap, which is plenty, with great smoothness of power delivery. I was just trying to be certain that I wouldn't lose any drivability from fitting RSRs. the overwhelming consensus is that I wouldn't so thanks guys. I have emailed Wayne to ask him, as if anyone should know he will. If he says no problem I will go ahead with the RSRs. In any event I will report back on Wayne's reply.
 
Cheshire cat said:
Thanks Leo. Can I ask why you took them off in the end? On my list of 'to do's' is an upgrade to C4 or possibly RS engine mounts at some time in the fairly near future.
Click to expand...

Rust!

The exhaust tip fell off as the rear pipe rusted away.

I'm not sure if it's easy to repair or not, but I'll get round to it one day.
I tend to do early morning drives at the weekend and I'm not sure my neighbours appreciate the rumble of the RSRs at 5am.
 
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