enlareged throttle body for ph2 172??

[Dan519]

Y-pipe makes a very big difference. You have to add a lot of fuel once you change that, which directly tells you that you're making more power

 

[Chip-mk1]

what size are these TB's chip? wondering weather to put my OEM TB back on now as like i said the 64mm version has never fully settled,problem being my car has been mapped with the 64mm TB on so will it be better to stick with it?

here's my graph after fitting the 64mm TB and Y pipe decat,as you can see i've lost a touch of power between 6250rpm and 7250rpm but gained a fair bit of torque + bhp mid range and the car feels better now,i know you say the enlarged TB's doesn't work but can a Y pipe make that much difference mid range? any help is much appreciated...cheers

Y Pipe Graph by scott1532, on Flickr

I was referring to Mwm inlets not tb's mate.
that difference in the midrange will be entirely the y pipe and not the tb at all, your old tb happily flowed 201bhp before so why would it restrict at 160bhp?

with the y pipe it's down to gas pulses interacting that causes the midrange difference.

 

[Nick172Cup]

Y pipe? What is that sorry? Never heard of it before.

Nick

 

[Chip-mk1]

Y pipe? What is that sorry? Never heard of it before.

Nick

Its the precat mate, in the midrange the two pulses from different cylinders end up hitting it at the same time which causes flow problems.

 

[Richinnes]

Is it just the new clios I.e 197/200 that have the y pipe?

 

[Chip-mk1]

Is it just the new clios I.e 197/200 that have the y pipe?

Yes there is no precat on a 172/182

 

[Dan519]

Is it just the new clios I.e 197/200 that have the y pipe?

it's a modification you do to the 197/200 manifold to remove the pre-cat

 

[Richinnes]

Arhhh can see y that would make such a big difference now.. Always interested to learn about different car cheers guys