Technical power gains from backbox only

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Technical power gains from backbox only

arc

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Got my supersprint back box fitted now. Its nice to have a (quiet) exhaust again. I didnt buy it expecting any difference in the way the car drives, but in the tiny distance i drove it back it felt a bit different. Does anyone know if the SS backbox on its own has much of an effect on power ?
 
Duncan said:
Once I got the middle section on it didn't seem to make a difference from just the backbox. Will all be sorted soon thanks to a CSC manifold with de-cat :yum: oh, and a 1242

You'll need to have a complicated spacer made up for the CSC manifold to go onto a 1242 - speak to Jamie. He had one :)

And no idea on power increase for the duplex. Id be inclined to say just any backbox wont give any negligable amount of power, maybe the odd 1 or 2 bhp.
 
AppleSei said:
Wat about my duplex system, you think i will have a power increse?

The Cinquecento back box is one of the worst I have seen so far. Just cut an old one open and you will see what I mean.

Anything will be better than the standard back box. The SS backbox makes quite a difference to the performance on the Cinquecento. The manifold helps it quite a bit further.

According to the before and after measured by Supersprint the power increase was 8.2bhp on the whole system (from 57.1bhp @ 5730rpm to 65.3 bhp @ 6010rpm). If you compare this to the much more powerful Punto 75, had a much lower increse (5.4bhp) because of a much better back box to start with (increasing from 78.9bhp @ 5810rpm to 84.3bhp @ 5850rpm).

The duplex system can be an improvement when done properly. The crucial thing is the Y-piece. It should be done by exhaust tuning specialists and not just by exhaust specialist (if you knoe what I mean).
 
well mine was done by MIJ performance in wallsall. It is custom made, other than that i dont know much about it, it used to belong to alex who might know better. The response feels quicker. What do you reckon?
 
Duncan said:
Was gonna ask about this. It's the only tubular maifold that will fit the 1242 innit? I know about the spacer, will PM Jamie (y)

You would be sending a pm to the wrong person, I have this manifold, and the spacer Jamie had made was too long, my local machine shop is making me a new one, out of one piece of steel, and then that will be fitted, will post pictures when I get it, they are saying monday, which is a shame, as tomorrow would have meant engine in car.
 
AppleSei said:
well mine was done by MIJ performance in wallsall. It is custom made, other than that i dont know much about it, it used to belong to alex who might know better. The response feels quicker. What do you reckon?

They certainly have done a good job then. If not it would make the car slower than with the standard back box.
 
Badger_Benji said:
You would be sending a pm to the wrong person, I have this manifold, and the spacer Jamie had made was too long, my local machine shop is making me a new one, out of one piece of steel, and then that will be fitted, will post pictures when I get it, they are saying monday, which is a shame, as tomorrow would have meant engine in car.

Ben, the Nürburgring will be still there on Monday.;)
 
Badger_Benji said:
You would be sending a pm to the wrong person, I have this manifold, and the spacer Jamie had made was too long, my local machine shop is making me a new one, out of one piece of steel, and then that will be fitted, will post pictures when I get it, they are saying monday, which is a shame, as tomorrow would have meant engine in car.

Just as well I forgot to PM him :D Anychance of you getting me one made in the future? Will get the manifold ordered first. I will give money upfront of course and pay P&P.
 
So having searched around for the answer i'm looking for i've found this page and so i'll put it here instead of starting a new thread..

My back-box is rattling like a b4st4rd and i'm gonna replace it with a supersprint back box. My insurance company gives the options for exhausts as 'non standard performance increase upto 5%, 10% or 15%'. Now i'm thinking that the exhaust in itself won't add much but no idea which bracket it would fall into 5, 10 or 15% what do you reckon???
 
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