Boost piping size

**newalliance123** · 08-09-2011, 06:20 AM

Hey guys I'm switching my setup from -5's and 3" piping to single turbo. I noticed a lot of guys running 2.5 or 2.25 on hot side and 3" on cold side.

Does anyone have any expearience with power curves, peak hp, response with different boost pipe sizes?

Taylor

**GTRADDICT** · 08-09-2011, 08:04 AM

Originally Posted by newalliance123

Hey guys I'm switching my setup from -5's and 3" piping to single turbo. I noticed a lot of guys running 2.5 or 2.25 on hot side and 3" on cold side.

Does anyone have any expearience with power curves, peak hp, response with different boost pipe sizes?

Taylor

May I ask why you are switching?

**gtrjon** · 08-09-2011, 10:13 AM

ive heard its supposted to increase spool time.... never seen a actual comparrison with dyno sheets tho..

**newalliance123** · 08-12-2011, 04:16 AM

Just looking for more power... would like to get to the 700-800 hp range over winter.

It seems like most of the turbo's im looking at have a 2.5" outlet so im thinking probably run a 2.5" outlet to IC and then 3" on otherside of IC.

**evilgtr** · 08-12-2011, 04:55 AM

7-800whp or fw hp ? Id like to know to as I also might be switching to a big single

**Super_Dude** · 08-12-2011, 02:19 PM

700-800 atw would want 3" piping.

700-800 atf you could get away with 2.5 but it wouldn't leave much head room.

**newalliance123** · 08-12-2011, 07:55 PM

ATW. I would like to hit around 700 WHP and get to 750-800 with a nitrous setup. I also will accept that power level on C16 as that is what the car will most likely see 25% of its life.

Just trying to figure a turbo setup still... I have the 6boost manifold with T4 flange. I was kind of thinking GT40 or GT42 but maybe a borg warner efr. So many options and im just learning as much as I can about compressor maps etc.

Any info is good info.

So 3" piping would be nice as that is what I currently have made up, it was just a lot of lag on the 2860's that I thought was unnecessary.

**gtrjon** · 08-13-2011, 03:03 AM

So 3" piping would be nice as that is what I currently have made up, it was just a lot of lag on the 2860's that I thought was unnecessary.[/QUOTE]

what are you expecting with a big single then lol.....

**MR666** · 08-13-2011, 06:16 AM

Originally Posted by newalliance123

I was kind of thinking GT40 or GT42 but maybe a borg warner efr. So many options and im just learning as much as I can about compressor maps etc.

Any info is good info.

So 3" piping would be nice as that is what I currently have made up, it was just a lot of lag on the 2860's that I thought was unnecessary.

Yah think 2860's lag ? LOL , LOL
.
Big singles make all the boost in the last half ! So your going to wait for it . If you had LAG, then you had other issues ! They could be many, depending on the way you have designed your system and the component volumes. Compressed air is 3 dimensional and kinetic.

**newalliance123** · 08-13-2011, 08:14 AM

Well most of the lag with the -5's were due to 3" piping. I have seen many single setups that have almost exactly the same time to come on boost as twins. If you think single = lag that's kind of incorrect as there are many factors mainly turbo sizing, it is all on how its setup, which is the same thing with twins obviously.

Well see I'll try the single setup this winter and see what kind of difference it makes I'm also switching to a 3L and MAP so maybe not the best comparison.