Looking for the forum’s input. It seems that virtually all of the turbo upgrade threads revolve around bigger and more hp but not many about efficiency and less lag. My question is what turbo options make the most sense if the primary goal is less lag and lower EGT’s? Presumably technology has improved since the original 997.1 BW turbos were developed. My car has a 93 octane UMW tune, 997.2 IC’s and do88 intake pipes. Runs great, plenty of power on full boost for my needs (weekend car, 99% spirited driving, no trips to the drag strip). It seems to me from reading the many threads on turbo upgrades that the options are bigger, more hp, more top end with more lag. Is there a more efficient option with less lag than OEM and no drop in power? In other words enhanced driveability since most driving is not at WOT?

I am probably going to drop the engine this winter and address the coolant pipes hence my question. Thanks in advance for your input.

You will find a lot of options , my advise to see your tuner reply and his thoughts ..

from my own experience.. I tried a lot of VTGs upgrades from 63.5mm till 71mm !!

Nothing beat the 71mm !! Give ESMotor a DM he will guide you to get your needs

good luck my friend

Thanks Sam, the fact that the 991 uses the same turbo speaks volumes. While there are a lot of options to upgrade power, there are fewer options to reduce lag. For example a 71 vtg is going to have more lag than stock. I have the tuning covered and some worthwhile mods but it sounds like I will be sticking with my stock snails for the time being.

Good question OP. Easy answer. You want stock 997 gt2 turbos. They have a better power curve and spool over TT units. I’ve tried 63.5, 65mm on my own cars and riden in 68mm cars many times. Yes they make more top end but that’s only fun with open roads. If you want great fun street powerband Don’t listen to guys who advise big HP turbos. You can’t cheat physics, I’ve owned everything from stock 997tt to 1500hp Gtr. 63.5vtg is max I would go on TT housings for fun factor unless your find gt2 units.

Protomotive and By Design have 63.5 vtg’s, Champion might too. GT2 turbos would be difficult to find used, not sure if they are offered new anymore. I have contemplated putting the GT2 compressor wheel in my stock housing. According to my tuner it would probably add about 60 hp to my current set up. Not sure if the juice is worth the squeeze though.

Thanks - this is exactly the answer I was looking for. Most of the responses in this thread were how great bigger turbos are which missed the point of my question. I want as little lag as possible, current power levels are fine. Apparently no turbo exists with less lag than what I have. As such I’ll stick with my oem turbos.