Decat question

[dannysupratt]

Hi guys im looking to go BPU on my facelift jap 6 speed TT it is completely stock bar a cat back HKS hi power exhaust and pulled 310 bhp on the rollers. I was going to get

 

. both decats

. boost controller set to 1.2 bar

. fcd

. 1.2 bar restrictor rings

. plugs

. fuel pump

 

Just a few questions.

 

Can i keep the standard intercooler? (it looks like new)

 

How much power will i gain ish?

 

What plugs do i need?

 

Will a walbro fuel pump be ok?

 

I have seen both decat pipes on whifbits for about £200 but they are only 2.5" bore will they be ok, or will i gain more power from a 3" bore?

 

Thanks everyone.

[merckx]

You should really fit a restrictor ring do give you somewhere in the region of 1.0 bar and then increase it up to 1.2 bar with a boost controller.

 

If you fit a 1.2 bar restrictor ring and if the boost goes slightly higher you cannot reduce it with a boost controller.

 

A boost controller can be only used to increase boost and not decrease it.

 

You'll need to fit a boost gauge too if you haven't already got one, so you'll be able to keep a check on boost levels.

 

 

 

 

Can i keep the standard intercooler? (it looks like new)

Yes.

 

How much power will i gain ish?

60 bhp? It's debatable.

 

 

 

What plugs do i need?

http://www.mkivsupra.net/vbb/showthread.php?t=41927

 

I use NGK - BKR7E (6097) - gap 0.7mm , cheap and they work.

 

You can buy more expensive ones too, again it's debatable which ones are best.

 

Will a walbro fuel pump be ok?

Yes, the Walbro 342.

 

I have seen both decat pipes on whifbits for about £200 but they are only 2.5" bore will they be ok, or will i gain more power from a 3" bore?

 

The 2.5" ones are all you need.

[dannysupratt]

thanks very much mate just what i needed to know.