Decat 2.5 inch system good for 430bhp?
#1
Decat 2.5 inch system good for 430bhp?
Hi,
I'm wondering if anyone knows if a decatted 2.5 inch system will support 430bhp as I've bought a TD05H-GXT-R blouch turbo and wondering what supporting mods are essential. I've heard conflicting reports about exhaust diameter.
Cheers,
Chris.
I'm wondering if anyone knows if a decatted 2.5 inch system will support 430bhp as I've bought a TD05H-GXT-R blouch turbo and wondering what supporting mods are essential. I've heard conflicting reports about exhaust diameter.
Cheers,
Chris.
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#12
Scooby Regular
iTrader: (5)
Paben is correct, the exhaust gas has more velocity in smaller diameter pipe with a dedicated diameter for a certain flow rate.
As the gas leaves the turbine housing into an exhaust that is too big, it gains pressure and loses velocity.
Whether 2.5 inch pipework is the optimal diameter I don't know but the smaller diameter you can get away with the better as far as spool and response are concerned.
As the gas leaves the turbine housing into an exhaust that is too big, it gains pressure and loses velocity.
Whether 2.5 inch pipework is the optimal diameter I don't know but the smaller diameter you can get away with the better as far as spool and response are concerned.
#13
Scooby Regular
iTrader: (30)
In my experience a 2.5 system spools better than a 3" on a smaller turbo.
I gained more power going 3" but also got more lag.
I have a full 3" h&s, sounds bloody lovely but my plans have changed now and I'm only going to 360-370 Bhp with something like a sc36 and a sports Catted 2.5" system.
I really need it to be quieter too with all the early starts I do.
Just to add the finish and build quality on my Hayward and Scott is brilliant.
Siv
I gained more power going 3" but also got more lag.
I have a full 3" h&s, sounds bloody lovely but my plans have changed now and I'm only going to 360-370 Bhp with something like a sc36 and a sports Catted 2.5" system.
I really need it to be quieter too with all the early starts I do.
Just to add the finish and build quality on my Hayward and Scott is brilliant.
Siv
#14
Scooby Regular
Thought SC38 was td05 based, and journal bearing
Was sure that SC42 & SC46 used GT30 based ball bearing cores,
Sc turbos not just the Blouch with a 7cm exhaust ?
Was sure that SC42 & SC46 used GT30 based ball bearing cores,
Sc turbos not just the Blouch with a 7cm exhaust ?
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