[joeybutts]

Hey gang, I have a Stett chargepipe with meth bungs that is approx 2.5" diameter piping. I've been searching for my answer and can't seem to find the answer. Is there a dramatic difference between a 2.5" and 3" chargepipe?

I have a 3" from before when my turbos went tits up, but it had a slight worn spot so went with a new one. I believe I read that a 3" minutely introduces more lag but increases power? Is it worth the swap out?

Thanks and sorry if I totally missed other threads regarding.

[Sgop335]

What sizes are the pipes leading to the cp? Starting from the outlets, fmic in, fmic out, j pipe ....cp.
it will only be a benefit if there is any significant pressure drop across the cp. i can calculate that if you have an estimated Maf or power
since the charge is cooled and boosted as it enters the cp, it sees the lowest volume flow rate and lowest pr drop. So unlikely any benefit.
Worst pr drop would be the hot air going thru the outlets, although we have two of those so needs to be doubled.
Fmic out, j pipe and cp see the lowest cfm.

[JM98]

There will be a negligible difference on a stock turbo car, Id recommend spending the money elsewhere.

[joeybutts]

Yikes, ok, so here is the mod list.....

RB Turbo Servicing including new bearings, seals, thrust upgrade, vsr balancing, upgrade to 15T Billet Compressor Wheel/Bullet nut, wastegate servicing and/or adjustment,
Upgrade to RB Next Gen (add TD04L-11 blade turbine)
RB High Flow Silicone OEM Style Inlets
RB High Flow Oil Drains
RB Basic Install Gasket Kit
RB PCV Valve
RB PCV Screw-On Cap
New Bosch Alternator
Boost Concepts FPM-1 Plug-n-Play 135i 335i N54 E85 Fuel Pump Bucket LPFP
STETT Performance N54 335i Dual Diverter Valve Charge Pipe
STETT Performance N54 335i Stainless Vacuum Canisters
DCI
BMS Cowl Filters
N54 JB4
MHD BEF Trebila tune
N54 BT Connect kit
N54 3.5bar TMAP sensor
FSB controller
100% methanol injection
Dual CM10 Methanol Injector Nozzles
BMS Oil Catch Can
UUC Black Transmission mounts
Engine Mounts
Methanol
AR 3” catless downpipes
Forge Diverter Valves
Helix Intercooler
Clutch Delay Valve
Clutchmasters Single Mass Flywheel and Clutch
TC Kline suspension
Powerflex subframe bushings
Powerflex differential bushings


Think that is everything..... I'm guessing I'm somewhere between 480rwhp and 510 rwhp.

[JM98]

Id venture to say you **might** pick up 5whp with larger charge piping. I was eluding to a 800whp big turbo build where you might see something more like 25whp.

[joeybutts]

Gotcha! I figured it was rather negligible but figured I would confirm.

Thanks!