All Things Mk5 > Performance Modifications
Ebay Sports Cat 100cell.... Pics & Fitted
JMP:
--- Quote from: nige bcs on September 13, 2012, 09:25:12 am ---The problem you need to be aware of is the braided flex liner.
As the gasses super heat the flex braid expands dramatically and chokes the flow of the system. Unfortunately it has no memory and stays in its expanded position, the net result will be a dramatic loss of performance.
The only reliable product suitable for this application is the stainless steel 'i - LOK' flex.
So if you are going down the path of upgrading your performance you need to be aware of this. In other words a loss of power may take some time for an un educated (on this matter) technician to diagnose, especially as outwardly the flex will appear structurally sound.
That is of course if it doesn't snap first - at just over 100mm in length it is no where near long enough to absorb the transverse torque of the 2.0 TFSi especially when tuned - it needs to be at least 200mm to prevent this (Just look at the OEM DP for evidence on this and feel how flexible it by comparison.
Sorry to be the bearer of disappointing news but hey knowledge ahead of the event can save money in the long run.
Cheers
Nige
--- End quote ---
Do you have example pictures about the deformed flex liners? I have yet to see an example of that happening in our cars.. The liner is in between two braids sections in this DP so there's not much room for the liner to protrude inside the 3" pipe even if it tried to deform. You right that the OEMP DP is in its own leaque in the lenght of the flex section, the section is a lot shorter in all aftermarket applications. Atleast Milltek and APR are very short also and similar lenght to this ebay pipe. I didnt google what the BCS dp looks like, but Im sure its great :)
Powervalve Nige:
Before the advent of 'i - LOK' technology believe it or not the flex joints had no liners at all leaving the convoluted flex hose visible and exposed to absorb this hostile environment on it's own.
Very quickly the short comings of this solution to transverse motion were exposed at this end of the performance spectrum, in spite of the fact that the development of the flexible de coupler by Senior Flexonics had been a life saver to the automotive industry after the problematic and completely inadequate - from a warranty perspective mechanical spherical joints - (Those that remember virtually the entire British Leyland range relying on this design - and the subsequent growth in the exhaust fast industry growing in response to the need for replacement every twelve months :grin: - will bear this out).
So the inner braid was the first solution, a design which was copied by both Indian and Chinese manufacturers supplying predominantly fluid flexible solutions not gas - sadly it fails to give the structural integrity over a long period that the 'i - LOK' gives, which in itself, inspite of what manufacturers tell you is not a totally 'bomb proof' design. The key to minimising the products failure risk (at this level) is to ensure on high performance applications that the flexible joint is sufficiently long enough to absorb both the mechanical energy and heat energy (Those of us that remember the 1st law of thermodynamics from our school days will understand this) in order to prevent the transference from causing the flex to crack or in the case of the braided inner style balooning as described in my earlier post.
As JMP says though this part can be replaced and a superior unit welded back into position as both the inlet and out let straight sections appear long enough to take a longer version - it would just be nicer for the owner not to have to undertake the hassle of this if it occurs :happy2:
Cheers
Nige
jammy78:
Well it's been on for nearly 2 months & I haven't noticed a drop in performance at all!?
The real test is coming up, either this weekend or next..... I'm taking it to Halfrauds Autocentre for the MOT (50% discount), so if they pass the emissions - every tester will!!!
sub39h:
--- Quote from: RedRobin on September 13, 2012, 09:33:01 am ---
--- Quote from: nige bcs on September 13, 2012, 09:25:12 am ---
The problem you need to be aware of is the braided flex liner.
As the gasses super heat the flex braid expands dramatically and chokes the flow of the system. Unfortunately it has no memory and stays in its expanded position, the net result will be a dramatic loss of performance.
The only reliable product suitable for this application is the stainless steel 'i - LOK' flex.
So if you are going down the path of upgrading your performance you need to be aware of this. In other words a loss of power may take some time for an un educated (on this matter) technician to diagnose, especially as outwardly the flex will appear structurally sound.
That is of course if it doesn't snap first - at just over 100mm in length it is no where near long enough to absorb the transverse torque of the 2.0 TFSi especially when tuned - it needs to be at least 200mm to prevent this (Just look at the OEM DP for evidence on this and feel how flexible it by comparison.
Sorry to be the bearer of disappointing news but hey knowledge ahead of the event can save money in the long run.
Cheers
Nige
--- End quote ---
....This is exactly the sort of expert information which people should be taking notice of and why I would not ignorantly attempt a Heath Robinson experimental approach whether I have a modding bug or not. Cheap eBay products are generally simply not to be trusted in my opinion.
Pay peanuts and you get monkeys.
--- End quote ---
No offence RR but sometimes I get the impression that you think that throwing money at something will make it better. I generally agree with the adage "pay cheap, pay twice", but i feel you're very quick to sing the praises of brands with known weaknesses whilst totally ignoring their limitations. Case in point: rubbish welding on Millteks. All the development you value so highly and money you spend, and you still got a shoddy product. They may have improved their designs now, but I think there's more to it than how much you pay or the fact it's from eBay.
This DP may still be rubbish. Only time will tell. But writing it off with no prior experience isn't fair
Dan648v:
^^ :happy2:
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