Now this is one of those performance tips discussed many times in early days of imports, however its surprising how many zeds still have these fitted, removal of the restricters will help with performance and possible fuel use.

 

Turbo`s will benefit from quicker spool up and non turbo`s from better flow, completely free to do yourself with absolutely no down sides.

 

Jeff TT

 

Ok if you have one of these fitted under your import zed then you very likely to still have the pipe restricters welded in.

 

 

Here is what the restricters look like with the exhaust removed,

 

 

 

Removal is easy, a hammer and chisel and it soon looks like this.

 

Why are they fitted originally, is it emissions?

probably sound

Why are they fitted originally, is it emissions?

 

It was standard on Japanese imports, they had some kind of agreed BHP figure there and its to keep within it, I am sure this is why lower powers are talked about for imports.

 

Jeff TT

did mine!...

Blimey, looks like something hauled from the wreck of the Titanic!

Thanks for the tip jeff :), will have to have a look at mine

 

Chris

Blimey, looks like something hauled from the wreck of the Titanic!

 

i noticed that wheres it been parked? the north sea?

i noticed that wheres it been parked? the north sea?

 

Came for a zed that is parked sea front on the west coast, you should have seen the rest of it!

 

Jeff TT

Any pics? Show us some of the worst examples you've seen Jeff!

Any pics? Show us some of the worst examples you've seen Jeff!

 

Matey I would but there maybe a few red faces here if I did, but without mentioning names one of the worst in the past few months was a GENUINE N.REG !!

 

Shockingly bad underneath, sills, floor, boot area, fuel tank, all suspension parts and the front rad support, front subframe and sump were all in a bad way too, poor guy had bought it thinking been a later zed it would be in good condition.

 

Took days to clean up treat and underseal but all good now, the later zeds have very, very thin underseal and in certain places have next to non.

 

Will look at some of my workshop photo files see if I can see some that are not forum members.:D

 

Jeff TT

Edited April 25, 200916 yr by JeffTT

was quite impressed with the underneath of mine, was a little surface rust, but no bad rot, and mine is a 92 uk

What's the purpose of the bit in the centre of the circle in the first pic? Are the two sides of the exhaust joined?

 

Do stock JDM TTs really make less power on the dyno in practice compared with export market? I always assumed the 280PS/300PS difference was just a quoted figure, and they were actually all the same...

It was standard on Japanese imports, they had some kind of agreed BHP figure there and its to keep within it, I am sure this is why lower powers are talked about for imports.

 

Jeff TT

 

how much possible bhp can be gained by taking these off on import tt?

how much possible bhp can be gained by taking these off on import tt?

 

Not really done any testing to give actual power increase figures but as they are designed to reduce or limit power then removal can only be a bonus.

 

After market free flowing exhausts are a well known method to get quicker response, so by freeing up the original system it has the same effect.

 

Jeff TT

So Jeff, i have had a mongoose cat back exhaust fitted, do i still have the restrictor's fitted.??

So Jeff, i have had a mongoose cat back exhaust fitted, do i still have the restrictor's fitted.??

 

No the part with the restricters fitted is AFTER the cats.

 

Jeff TT

Not really done any testing to give actual power increase figures but as they are designed to reduce or limit power then removal can only be a bonus.

 

After market free flowing exhausts are a well known method to get quicker response, so by freeing up the original system it has the same effect.

 

Jeff TT

 

thanks jeff, can you remember if I had these restrictors on when you did my engine swap in jan (its Shaz from Leeds)- forgot to mension you did a fantastic job z is running sound:) and thanks for sorting the targa tops -not a drop insight when it rains! have not driven her much tho..

thanks jeff, can you remember if I had these restrictors on when you did my engine swap in jan (its Shaz from Leeds)- forgot to mension you did a fantastic job z is running sound:) and thanks for sorting the targa tops -not a drop insight when it rains! have not driven her much tho..

 

We remove them as a matter of course when we come across them, cannot honestly remember with yours if they where still in place, but either way they will not be there now:D

 

Jeff

We remove them as a matter of course when we come across them, cannot honestly remember with yours if they where still in place, but either way they will not be there now:D

 

Jeff

 

Excellent, Thanks