Does using bigger diameter intercooler piping affect throttle response? Based on a stock 16G or a hybrid 20G turbo. If response is my up most priority, what kinda diameter should I be looking at? The bigger the piping the more laggy it is am I correct?

 

Humanly I doubt anything other than a graph would be able to distinguish the difference even between the largest IC and piping vs a standard set. The reason is once you add air volume to a cylinder for example it takes less and less volume of air to realize a 1 psi in pressure.

Basically 1atm is what you and i are breathing at sea level. Notice as you go from 2 atm to 3 atm the difference in volume is less than the difference between 1 to 2 atm.

Here's a graph:

 

So can I interpret it as bigger piping size = more lag and a smaller piping would give me more response? PArdon me but I don't really understand the graph.

 

I just put a LICP on my car last night and it felt more snappy to me... but it was pretty cool last night too so that could have been it.

 

The graph is basically what happens when you take a fixed amount of air and squeeze it down to a lower volume. What i'm showing here is that the rise in pressure is not linear.

In addition to that stock we run a 44lb/min turbo that around 636 CFM (cubic feet per minute) or 18030 LTM (Liters per minute). That's enough air flow to fill at 1 atm 150 2liter bottles every second. Or if you want at 2atms 75 2 liter bottles or at 3 atms 50 2liter bottles.

 

I kinda get what you're saying regarding it not being linear. But I still don't quite get the idea on how to figure out what is a good size for me. I'm running a JDM stock turbo which is hybrid to a 20G.

 

the short answer: yes.
the long answer: while true, in practice the difference will be so small you probably won't be able to tell. On the other hand the improved cooling and reduced flow restriction will give you much better top end. Pipe volume is more important on the hotside (exhaust manifold) driving the turbo, but on the cold side it's not very sensitive.

 

Its very hard to say what the optimal diameter piping will be for throttle response. This depends greatly on the turbo that is used, and other mods that are used. I say just use the biggest/shortest piping available and hope for the best I do know for sure that its best to eliminate flexible intercooler piping, this will increase throttle response for sure.

 

Basically I'm saying the the added volume of a giant intercooler and big piping is negligible. All the lag encountered by a turbo system is directly related to the size and weight of a turbo. The best way still to improve response is to add displacement so the turbo will spool sooner and give your car added torque which is that feeling of "response".

 

Yes, it adds lag for sure. I did testing between our 2.5" i/c pipes and 3" over this last winter. I am running 2.5" plumbing on my car.

 

I think the best for increasing throttle response would be the throttle body. It made a night and day difference when I got the ported stocker on my previous car (SRT-4).

 

Definitely not going to argue that point but i thought your test was over horsepower gains.

Going over the test I find it interesting that 20psi is reached within 100rpm of each other but peak boost varies much more. I think the 20psi mark is more scientific since the peak boost numbers are different per pull

Link to Test:
https://www.evolutionm.net/forums/sh...er+piping+test

 

I am running a Kansai intake manifold so I think thats decent enough =D