^^that is incorrect, there is more than just the hp rating to look at when it comes to your d/p, a 3" will dramatically increase spool times, and it will reduce temps under the hood because the turbo is flowing more freely.
^^^I think it was a misunderstanding. I think he meant intercooler piping, not downpipe.
I think I need both Piping bigger. Like 3" all the way around…Down Pipe and Inercooler piping…So I’ve been told.
Ralfy… you don’t need bigger i/c piping…just shorter ones.
as for the down pipe… your 2" or 2.5" dp… is or was sized correctly for your application. Though 3" dp will increase spool time… with will also increase the chances of over spooling as well. This will also cost excess underhood tempetures…and heat soak the I/C. But… If I know you… you will go 3" anyways.
“overspooling” :surrend: 
:wtf:
yep… over spooling…
please explain overspooling…
Over spooling is when the turbo [usually a small a/r turbine] is spinning out of it’s efficiency range which would cause the turbo to glow orange.
I’m not saying a 3" down pipe…and or I/C piping is not a good thing… but it depends on the setup and I’m talking about Ralfy’s setup.
no, thats not overspooling, that happens when an engine has been running at very high rpm for an extended amount of time, the heat produced at high power levels is extreme, and after an extended amount of time at those power levels, it heat soaks the turbine housing and makes it glow orange, look at an F1 cars header when its in the pits, they glow orange.
you cannot “overspool” a turbo, you can however like you said, run it out of its efficiency range but all that will do is put a cap on the maximum horsepower the engine can produce, hence why turbos are rated at the horsepower levels they can produce instead of boost levels.
a properly tuned engine will have stable EGT’s and at power levels less than 350hp should not be able to get a turbo to glow orange. I am almost 100% positive DRAG includes T3/T04B turbos in their kits, and those turbos are good for ~350-400hp. My main point was that a 3" downpipe will do alot of good for any turbo setup, wether it be a 200hp or 500hp, it increases spool time, maximum boost levels, and maximum horsepower.
Thanks, that’s good info.
And my main point is that a 3" downpipe is not necessarily a good thing with certain applications. I stand corrected regarding Ralfy’s system. I was not aware of the the capability of the drag kit. I couldn’t understand why some one that is running 7~8lbs on a super low compression motor making 200± would need a 3" downpipe, muchless 3" i/c piping
yes 3" intercooler piping is pointless. 2.5" I/C piping is pushing it if you ask me, almost 90% of T3, T3/T04 B and E turbos have 2" compressor outlets, which leads me to ask most people why 2.5" piping. i personally run 2.25" on my setup, and have had no problems regarding restriction. Oversized intercooler piping does one thing…increase lag, nothing more. Ive read 2.5" intercooler piping is suitable for applications up to 800hp. which leads me to ask whos running 800hp? i could probably count on my hands ACTUAL dyno graphs of honda engines running at that power level, not just heresay.
so the point is 2.25" I/C piping and a 3" downpipe seem to deem the most logical answers to the questions of what sizes these parts need to be.
A 2" outlet will flow to about 250 whp so Its absolutely pathetic. Dont’ even bother with it. A 2.25" will probably flow to about 300 whp so once again don’t bother. A 2.5" will flow to about 400 whp so this is a good size pipe to clear the belly. A 3" pipe we’ve found will flow to about 700 whp on a supra so about 600 for a honda. Any thing over this size will be over kill for a honda. Besides unusable power is straight up wastage. This is also the reason why I preach getting a standalone with traction control integrated. A motec M4 works well, IMO, even with 2 channel trac.
-Joe
i hope your talking about downpipes because if your talking about compressor outlets your full of shit
everything youve said is false if this is the case
I got a turbo with a 6.5" inlet and a 5" outlet…it came from a spaceship I found in my backyard.
^—hey give it back :hyper: