Kaan W Posted October 16, 2012 Share Posted October 16, 2012 (edited) Just a quick question as im replacing my intercooler piping as it gets in the way of the new front bumper and it looks a bit old and grotty. So what size should the pipe be for a single turbo running approx 600bhp on stock manifold as I have a mismatch of different size pipes and couplers from the turbo outlet to throttle body. At the moment it goes something like this - Turbo outlet - 76mm Pipe from turbo to intercooler - 70mm Intercooler 70mm both ends. Pipe from intercooler to throttle body - 87mm Throttle body - 76mm So was scratching my head over this and was thinking that the massive 87mm pipe after the intercooler is just increasing the volume the turbo has to fill before entering the engine meaning more lag right? Now im no expert but would I be better off just having 70mm pipework all the way to a 70-76mm reducer coupler to the TB? If im just sounding really stupid can anyone tell me what pipe I would be better off using? Thanks Edited October 16, 2012 by Kaan W (see edit history) Quote Link to comment Share on other sites More sharing options...
Noz Posted October 16, 2012 Share Posted October 16, 2012 (edited) More volume does mean more lag, but you can calculate the extra volume by working out the area (pi*r²) of a cross section of the different pipes then multiply that by the length of the pipe. you can deduct the difference between the smaller 76mm diameter and the 87mm diameter to tell you how much extra volume your have, but it will probably be very small in comparison to make a difference in performance. Usually with anything flow related the most important thing is bottle necks, changing down a size to the typical diameter used will do alot more harm than up a size. Going up a size will just cause disturbance will cause some resistriction - but not alot. This is usually created at the point where the size reduces to the typical size again, from 87mm to 76mm for example the bottle neck will be the point flow is disturbed. Going up a size half way in the system shouldn't cause a problem IMO with those diameters. And changing from 70mm to 76mm won't make much of a difference. If your going to go up a size, then change by a big difference to make it worth the hassle your need to go through. 70mm is a good size I've seen alot of other setups with the same diameter, usually 76mm but there really isn't a massive difference. Edited October 16, 2012 by Noz (see edit history) Quote Link to comment Share on other sites More sharing options...
Kaan W Posted October 16, 2012 Author Share Posted October 16, 2012 More volume does mean more lag, but you can calculate the extra volume by working out the area (pi*r²) then times that by the length of the pipe. you can deduct the difference between the smaller 76mm diameer and the 87mm diameter to tell you how much extra volume your have, but it will probably be very small in comparison to make a difference in performance. Usually with anything flow related the most important thing is bottle necks, changing down a size to the typical diameter used. Going up a size half way in the system shouldn't cause a problem IMO. And changing from 70mm to 76mm won't make much of a difference. If your going to go up a size, then change by a big difference to make it worth the hassle your need to go through. 70mm is a good size. Ahh cheers for that. I just thought that if the overall size at the end of the pipework is 76mm where it enters the throttle body then this would be a bottle neck if I had say 100mm pipework all the way. Just edited turbo outlet is 76mm not 70mm. I think 76mm from turbo to manifold will probably be my best bet then what do you reckon? Also wheres the best place to order this pipework or shall I make it up as I go along with say ASH products or such? Quote Link to comment Share on other sites More sharing options...
Noz Posted October 16, 2012 Share Posted October 16, 2012 (edited) Pipework is pipework, silicone joiners should be decent with high boost cheaper ones have less ply in them (even with the same number of layers they are always noticably thinner). They come with 6 weaves for example IIRC but the amount of silicone between the layers is minimal. At high boost cheaper ones can fail, but pipework just get the cheapest you can as your never going to pop alloy tube however poor quality it is. Make sure you get decent clamps as well. Mikalor clamps are the business, they are seriously wide and really meaty. I'd keep the piping the same diameter as he turbo outlet as a minimum mate, that way its performing its best but Im still not sure if you'd see a difference. Maybe some guys on here with some spare clamps as they aren't cheap. JamieP has a wall full of them once! My mate at Boostjunkies.co.uk sells silicone joiners from a new company, and the quality is amazing, they are alway alot thicker and stronger than any samco hoses. And samco hoses aren't as good in my opinion. After seeing his range of hoses I was seriously shocked how thin samco hosing is! I'll get a comparison of his hoses if you want just to proove what cheap vs named brand vs new products looks like if you like? Being a small company they are trying to produce the best products possible for the best price so they can grow and contend with the typical brands. Samco are a good product don't get me wrong, but I've definitely seen better, thicker and more durable material used with smaller companies. Edited October 16, 2012 by Noz (see edit history) Quote Link to comment Share on other sites More sharing options...
Ian C Posted October 16, 2012 Share Posted October 16, 2012 Don't forget to get a bead on the ends of the pipes, otherwise you'll be plagued with hoses popping off. With a bead and a decent jubilee clip you'll be sorted. The jubi clips need to be solid rather than slotted, hard to describe, but the slotted ones just chew through the silicone in the end. Quote Link to comment Share on other sites More sharing options...
Kaan W Posted October 16, 2012 Author Share Posted October 16, 2012 Don't forget to get a bead on the ends of the pipes, otherwise you'll be plagued with hoses popping off. With a bead and a decent jubilee clip you'll be sorted. The jubi clips need to be solid rather than slotted, hard to describe, but the slotted ones just chew through the silicone in the end. Ahh I see mate, cheers for the heads up Quote Link to comment Share on other sites More sharing options...
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