turbo build boost pipes - Saxperience

Pug106-GTI · 27th November 2011, 15:30

what kind of boost would you manage to run using 2.25" pipe work?

i have a reducer 2.5"-2.25" coming from the TB and the intercooler i have been looking at is 2.25" inlet and outlet would this be ok or would i be better off looking at a full 2.5" kit so theres no reducers anywhere

stevo1600 · 27th November 2011, 22:31

It will be fine with reducers, just don't go plumbing in different diameter pipes. And keep bends to a minimum if you can.

I'm ripping my 2.25 pipe work out and replacing with a full set of 2.5 as I plan to run more boost, maybe even a bar, so restriction is going to be down no end.

It's a tad more expensive but does look chunkier and better in the bay.

dannygti · 27th November 2011, 22:55

thats not a good idea^^^

i run 2" boost pipes and my car will be good for 300@wheels

wolf_gsxr · 27th November 2011, 23:41

It's a common misconception to put massive boost pipes when upping the boost (to a point) it's the overall volume of the pipes that matter. Increasing the diameter of the pipes will only cause lag because there is less air density/ boost in the pipes. 2.25 will be more than big enough for any saxo engine spec.

Ross^p · 28th November 2011, 01:04

2.25 on mine when it was 400hp. Pointless going bigger. Harder to route, more expensive, laggier. Small is beautiful as my wife says...

stevo1600 · 28th November 2011, 01:38

Just checked some spare pipe I'm running 2 inch

could of sworn it was 2.25 but that's what I'm doing replacing with 2.25.

wolf_gsxr · 28th November 2011, 02:19

what power are you running mate? if you increase the diamiter try re-routing the pipes so there shorted so you dont get more lag if thats posible to do with the room in the bay

stevo1600 · 28th November 2011, 02:38

Hoping to run around 13 psi to start with mate, I'm only replacing because of a different theme I'm going for aswell as needing to re route boost pipe as they aren't in the ideal places. I prefer the look of 2.25 pipe so just a personal preference.

dannygti · 28th November 2011, 05:48

Your making the car fast not tarting it up!

If your trying to make a good setup, common sense would suggest you go for the smallest ID pipe necessary for the desired output.
And 2" boost pipe is efficient upto 360hp

blackie_2k5 · 28th November 2011, 09:49

aggree with danny, i bought 2.25 before i down spec'd, ill be goin 2 in the new year

axsaxoman · 28th November 2011, 10:28

what size is the outlet from the turbo?
,that tells you what size to use
you have enough lag on a turbo without making it worseby giving it more volume to fill up

stevo1600 · 28th November 2011, 11:25

Hmmm i have no choice now, otherwise I think your gunna kick my arse Danny

dannygti · 28th November 2011, 14:59

Like John said, even most gt30's use a 2" outlet off the turbo.

Thats right steve

toger13 · 28th November 2011, 18:45

i use 2 inch pipes and have no issue with power

Si

dannygti · 28th November 2011, 18:47

Quote:

Originally Posted by toger13

i use 2 inch pipes and have no issue with power

Si

get a progress thread up si, your cars awesome!

tweeqd · 28th November 2011, 19:41

my T34 has a 2 inch outlet and my cooler has 2'' inlet and outlets, ive just swapped all my pipes to 2''

Pug106-GTI · 28th November 2011, 19:58

Well I am thinking of starting with low boost and upgrading to go higher boost... I see 9/10 people use 2.25" so think I may go for that?

Was looking at gt2871r turbo but with low boost then maybe turn it up or upgrade to a gt30

Cheers for comments guys... Didn't mean to cause a boost war

LOL

dannygti · 28th November 2011, 20:01

Quote:

Originally Posted by Pug106-GTI

Well I am thinking of starting with low boost and upgrading to go higher boost... I see 9/10 people use 2.25" so think I may go for that?

Was looking at gt2871r turbo but with low boost then maybe turn it up or upgrade to a gt30

Cheers for comments guys... Didn't mean to cause a boost war

LOL

by saying that you havnt taken onboard several peoples opinion, also a few people have very good knowledge. please dont overlook this.

2" pipe only becomes restrictive over 360hp, are you going for more than this?

my guess (not being mardy) is you havnt been in a saxo/106 with a good charged setup?

also, i would totally advise againt a gt2871r. but thats just me.

what is the car for?

Pug106-GTI · 28th November 2011, 20:08

Car is going to be used for daily driving aswell as the odd track day

What would you advise against it mate?

And haven't been in charged 106/saxo at all! Lol

Not got a power that I am aiming for just gone through the thread again and realised that a lot of people would prefer the 2" setup but I'm finding it hard to find a intercooler with 2" inlet and outlets lol

Also does anyone know that size the cituning pipe is? The one that comes off the TB

dannygti · 28th November 2011, 20:13

Quote:

Originally Posted by Pug106-GTI

Car is going to be used for daily driving aswell as the odd track day

What would you advise against it mate?

And haven't been in charged 106/saxo at all! Lol

Not got a power that I am aiming for just gone through the thread again and realised that a lot of people would prefer the 2" setup but I'm finding it hard to find a intercooler with 2" inlet and outlets lol

Also does anyone know that size the cituning pipe is? The one that comes off the TB

the turbo wont start spooling til late 4k on a good setup...wont make full boost (say a bar) till well past 5k. this gives you a very short power band which is the opposite thing than you want.

for a road car id bet money that a properly sorted/spec'd car with a gt25 would piss on a car with a gt2871r or even gt30xxx.. on the road.

on track its different, but even then i doubt there would be 'that' much in it.

id find one with 2" outlets, the end result will be worth it.
when building a car like this, think of the end product you want then design/choose everything with that in mind.