Oh..........my.............god!!!!!!!!!!!!

[raviahluwalia]

I was looking into a decat as my next mod, as it has got to be one of the cheapest, yet most effective ways to gain some power.

I have seen on the forum that a TRL FCD is about £75, is this costly / difficult to fit?

Luckily I acquired my RZ with UK spec brakes all round.

[Terminator]

Originally posted by raviahluwalia

I have seen on the forum that a TRL FCD is about £75, is this costly / difficult to fit?

 

Instructions on the TRL site.

 

Not difficult to fit yourself.

[Doughie]

Originally posted by Terminator

Induction,

 

The HKS pipe is a three inch, when you add on of CW's front pipes 2.5 inch you are likely to go over 18 psi if you have a performance exhaust. Chris can provide a restroctor ring which will keep the boost safe more inline with the two pipe CW system.

The ring does work, it lowered my top level from 1.4 to 1.1 bar on a J spec.

 

 

"Induction" has got a UK-spec, so he won't get overboost on his car even with a full de-cat and a performance exhaust.

 

Induction - I had a 1995 UK-spec car and did a full de-cat (CW) and a Blitz NUR spec exhaust and it boosted to about 14 or 15psi.

you won't get overboost problems on a UK-spec.

 

On a Jap-spec - yes, real possibility, but not the UK-spec.

[Induction]

Stu

 

Thanks for that - things are becoming a bit clearer now that I'm getting some info direct from a UK spec owner.

 

I've already got the HKS front pipe and am still waiting for the Super Drager to arrive. So, if I fit both of them AND a downpipe, then I assume I will have a system in place that is pretty free-flowing.

 

Now, does this mean I still need a boost cut controller / fuel cut defencer, etc., or not? And is a boost gauge strongly recommended?

 

BTW, where is Chris Wilson, have I read on the board that he's in Shropshire somewhere? If so that's not too far for me.

 

Jules

[eyefi]

"I've already got the HKS front pipe and am still waiting for the Super Drager to arrive. So, if I fit both of them AND a downpipe, then I assume I will have a system in place that is pretty free-flowing."

 

yes

 

"does this mean I still need a boost cut controller / fuel cut defencer"

 

if u want to run over 14psi, u may need the fuel cut def anyway cos fuel cut happens at around 14psi and u may get this just from decat + exhaust.

 

"And is a boost gauge strongly recommended?"

 

oh yes.

[Doughie]

Originally posted by Induction

Stu

 

Thanks for that - things are becoming a bit clearer now that I'm getting some info direct from a UK spec owner.

 

I've already got the HKS front pipe and am still waiting for the Super Drager to arrive. So, if I fit both of them AND a downpipe, then I assume I will have a system in place that is pretty free-flowing.

 

Now, does this mean I still need a boost cut controller / fuel cut defencer, etc., or not? And is a boost gauge strongly recommended?

 

BTW, where is Chris Wilson, have I read on the board that he's in Shropshire somewhere? If so that's not too far for me.

 

Jules

 

 

yep as eyefi said, what a fuel-cut defencer does is allow your car to boost over 14 psi or so. It doesn't (on it's own) give any performance increase, but what it does do is let your other performance mods have a full effect.

Yes, get a boost guage - if you boost too high the engine may run lean and that's bad. About 17 or 18psi (i.e. about 1.25bar) is the recommended limit.

Like I said, i doubt your car, being a UK-spec, will be in any danger of getting that much boost. but you should still get a guage. Chris Wilson can supply and fit, as can Leon Greene etc.

 

Chris is in Shropshire somewhere or other, and is very knowledgable and experienced.

someone should have his email address or phone number to hand.

[Chris Wilson]

Originally posted by Keith C

 

The UK-spec pipes are different anyway, to allow for the 2nd sensor in front of the no.2 cat.

 

Thanks for all the kind words guys, I am blushing!

 

To clarify, the UK first pipe has a different flange size where it joins the turbo elbow, the UK second cat pipe has an extra O2 mounting flange welded in, and the late VVti imports have yet another first pipe, different altogether. The N/A cars are totally different and I make a one piece pipe for these. I was surprised myself what a difference removing the cat made to an N/A, definitely a good mad on those.

[Chris Wilson]

Originally posted by Doughie

 

 

yep as eyefi said, what a fuel-cut defencer does is allow your car to boost over 14 psi or so. It doesn't (on it's own) give any performance increase, but what it does do is let your other performance mods have a full effect.

Yes, get a boost guage - if you boost too high the engine may run lean and that's bad. About 17 or 18psi (i.e. about 1.25bar) is the recommended limit.

Like I said, i doubt your car, being a UK-spec, will be in any danger of getting that much boost. but you should still get a guage. Chris Wilson can supply and fit, as can Leon Greene etc.

 

Chris is in Shropshire somewhere or other, and is very knowledgable and experienced.

someone should have his email address or phone number to hand.

 

Thanks for kind words! My phone number is 01948-841581 and if I am out the answer phone gives my mobile number. I am just south of Whitchurch off the A49 (the road Oulton Park is on, which is about 20 miles north of me, as a guide) Postcode is SY13 2BT.

 

Cheers.

[Bruce]

N/A owner suddenly wakes up...

 

I thought that this mod would only benefit the TT owners, I have a vvti N/A with a HKS Hyper rear section, how much benefit in terms of bhp would you expect this to make??

 

Oh yeah, how much would it cost???

[AJI]

Patrick :

If you are doing it in stages I think it would be better to remove the rear CAT first as you would probably need a boost controller if you removed the front CAT on a J-Spec. The front CAT is the most restrictive and you will notice more difference when this one is out.

Check with a few more responses about this as I'm not 100% sure on the J-Spec because I have a UK-spec which has bigger wastegates and therefore doesn't suffer from as much boost creep when CATs are removed.

[Chris Wilson]

Originally posted by AJI

Patrick :

If you are doing it in stages I think it would be better to remove the rear CAT first as you would probably need a boost controller if you removed the front CAT on a J-Spec. The front CAT is the most restrictive and you will notice more difference when this one is out.

Check with a few more responses about this as I'm not 100% sure on the J-Spec because I have a UK-spec which has bigger wastegates and therefore doesn't suffer from as much boost creep when CATs are removed.

 

A boost controller in the normal sense of the phrase can only RAISE boost, not lower it. I find with my pipes 90% of J-Spec cars with both cats removed do not suffer creep. The odd ones that do can be tamed by a restrictor ring which I can cheaply supply.

 

You are quite right about UK cars, their bigger exhaust housing A/R ratio means they do not suffer creep no matter how unrestrictive the exhaust you fit is.

[Adam W]

Originally posted by Chris Wilson

You are quite right about UK cars, their bigger exhaust housing A/R ratio means they do not suffer creep no matter how unrestrictive the exhaust you fit is.

 

 

Ahhhhhhh . . .. I'd heard people say that the UK wastegate design was different to the J-spec, thus peventing overboost, but that's the first I've heard about a different a/r ratio. If you're right that would make a lot of sense though . . .

[Patrick_Devlin]

AJI;

 

Thanks. I am still leaning towards replacing the front cat. I think the best thing is to have a word with Chris W. I get the impression from all the decat threads on the BBS that it will be OK, but there's only one way to find out.

 

Regardless of which one goes first, I'm still looking forward to starting on the slippery slope of mods...