Originally Posted by WhiteKnight

I have tested my car with 91 octane (equals to ~95 octane Euro fuel), it really changes things.

Off the shelf 93 octane tunes won't work with that octane level, ECU retards timing too much.

997tt loves high octane, thanks to its 9.4:1 compression engine

Originally Posted by TTdude

Yeah, but that would require shifting...

Originally Posted by farris

How can octane levels be different in the US or Europe?

99 RON is readily available in the UK, isn't that 93 Octane US?

Originally Posted by Shotcaller

We got off the shelf tune on the car which ran 5's on 93 octane

I agree that custom tune would be way to go if u want best results

Originally Posted by farris

Hi Guys,


What are the main modifications done to the stock VTGs to get the best results?

I know of:
1- bigger billet compressor wheel
2- clip turbine
3- extrude housing
4- Anything Else?

I am trying to establish know how much can be squeezed out of the following setup on Pump Gas without crazy boost and with the stock tranny.

I am looking to do the following:
- Protomotive Modded VTGs
- 5" Intercooler
- Protomotive 2.75" X-Pipe Catless Exhaust
- Protomotive Tune
- Intake - BMC Panel Replacement Filter
- TCU Upgrade
- Boost Recirculatoin Valves

Who all have similar mods and what numbers are you doing?

Please list:
- mods
- whp
- wtq
- 1/4 mile
- 60 - 130
- 200 to 300

I know there are some great cars out there with Modded VTGs like Milou's and 997John's!

Come on guys post your cars and info

Originally Posted by milou

Farris,

i was waiting for the heat to drop a bit, do some runs and post them. Now the weather is like 26 degrees Celsius so i'll try tonight and post them here. I'll send them for verification this time, i should be withing the fastest convertibles

Originally Posted by edelectra

I have had modded vgts in the past if money is not an issue just go rite 2 the gt 30s u will be happier in the long run

Originally Posted by Arone997tt

going in on monday