onfireTTS

No turbo’s in a GT3RS ! Lol.

The complete engine/cooling/technology in the GT2RS is simply amazing. The price point for what is in that package is very reasonable. I totally would change the minor things that I do not like if it were AWD. It is a tech marvel.

Jean

Exactly what I needed

Makavelim3

If I was in your position and want to stay OEM turbos, I would keep 991.2 TTS turbos and install all bolt performance parts. With a conservative tune you can see around 700WHP. Methanol Injection/water injection & larger intercooler will help with the cooling. Plus if your goals are street and highway pulls, you have plenty of air circulation to cool down the car. Keeping the turbos happy on the track is way more difficult.

Want to make more power, go with 68mm or 70mm VGT turbos. Off-course the smaller the turbo is the faster response. you want to go more crazy go the non-VGT route.

onfireTTS

Here are a couple of Dyno's to give you an idea of the value of the GT2RS Turbochargers. Both on pump. The TTS sheet has the bolt on's IC's etc but no meth. The GT2RS is just a tune. Shows the OEM TTS billet wheel tapping out around 645rwhp on pump. The GT2RS has about 50 more in it. I think it's the same dyno and same tuner. You can pick up more HP from both platforms with Meth since it will allow more timing to offset hp pumping losses. Probably another 40-50rwhp. But sounds like you are like me and only want a pump tune.

Pb Pedis

This is great advice which I’m going to take. Except the meth and water injection - whatever I do has to work on 93 octane pump gas only. I’ve begun collecting quotes to finish the bolt ons with or without the 68mm VTG turbos. I value the incremental approach to mods so I can appreciate each step’s performance addition, but the labor savings to just do it all at once is hard to beat. The conservative tune means a lot to me so it’s probably going to be a custom GIAC setup.

Pb Pedis

Man that GT2RS is such a beast! Do you know what size the compressor wheel is for the OEM GT2RS turbos? Just wondering how those OEM turbos compare to the 68mm VTG upgrades for the TTS.

onfireTTS

TTE told me they measure at 67mm. But the major magic is in the turbine. It is 55mm. The 991.2 TTS is 58/48. You can put a 68-72mm compressor wheel on the CHRA, but clipping a factory 48mm turbine isn’t going to help the flow a lot. A bit, but not a lot. “For me” , the 68mm Hybrid upgrade VGT turbos’s are a no brainer for the 991.1 platform.

The 991.2 TTS isn’t going to gain a lot without METH with the Hybrid 68mm. It needs to be pushed to shine.

Just look at the above graphs. A 67/55 only picked up 50rwhp on pump over a 58/48. How much do you think a 68/48 will pick up on pump. 25-30?

onfireTTS

This is the only aftermarket VGT that is in a 991.2 housing but has a larger turbine to match a larger compressor.

https://tteglobal.com/porsche/911/99...chargers?c=138

TTE claims it makes more power than a factory GT2RS turbocharger.

If true, would be an expensive but killer upgrade.

I can’t find anyone using it. BBI used a different variant (TTE1200) but it’s not comparable.

2fcknfst

You have to truly respect the amount of love that went into setting up a a pair of those TTE units, and ignore the price. Dynamically balanced on multiple planes up to 250k rpm?

Oh, yes please!

onfireTTS

Agreed.

A Compressor Map and a Turbine Map would be killer, but they do not have them. Sex Appeal is the larger turbine wheel to match the Comp wheel, but a HUGE question remains about the compatibility with the existing turbine housing for overall flow....could be better or worse,,,,

Best, best case scenario would be a 67/55 on the 991.2 format, bolt in from BW......

2fcknfst

You would think, especially at that price point, they have in fact done this. Funny how some folks are stingy with their compressor maps.

Jean

There are others actually, and also have more options than TTE. There is a 900HP version that is much more suited to big power without the increased lag.

onfireTTS

Great. Please post up the details.

The TTE1000 has noticeable lag ?

2fcknfst

I may want to be a test pilot...

Any takers?

Pb Pedis

Well, I had the opportunity to go for a ride today in a 991.2 TTS with the 68mm VTG hybrid turbos (and the other usual bolt ons) on pump gas 93 octane, and I have drawn one unmistakable conclusion: you were right. The car felt not much faster than my own 991.2 TTS with a tune only, or at least “not faster enough” compared to my car. I am not interested in meth injection or even race gas, so this marks the end of my soul searching on whether to get into bigger turbos - not gonna do it. I’m sure the 68mm VTG makes all the sense in the world on race gas and/or meth, but that’s not my journey with this car.

Makavelim3 also called it. I’m going with the rest of the usual bolt ons (other than turbos) and the performance will be what it’s going to be.

On an unrelated note, I’m also now convinced that 21” wheels are just too big. If a wheel upgrade is in my future, they will be 20” in diameter and lighter/wider than the stock centerlocks.