Best 550whp 07K turbo?

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Best 550whp 07K turbo?

Postby versacehobo » Fri May 25, 2018 2:13 am

Unfortunately, e85 is a pain to get where I am. Its about 30mins each way, so I'll be forced to run 93oct + water meth.

Ideally I'd like to make north of 500whp with the 07K utilising the aforementioned fuel.

Will a Xona 7865 be too big for my goals - I'm more so after a good midrange, 4000rpm - 8000rpm.

I'd love to hear from guys running 07K and which turbo they're using (as well as fuel).

Thanks
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Re: Best 550whp 07K turbo?

Postby audifreakjim » Fri May 25, 2018 11:49 am

That's a good size for this. Pretty much the same as my ERF8374.

I was struggling to get to 500whp on pump gas, even with water injection. I gained over 150whp just going to half 91 pump/half e85. It results in a mixture of about e40.

The direct injection on the TTRS/RS3 really makes the power on pump gas unfortunately.

93 instead of 91 might just get you far enough down the road to get there.

If I were you, minimize exhaust back pressure as much as possible. I am running a 3" down pipe, it should probably be 3.5" on a 79# turbo.
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Re: Best 550whp 07K turbo?

Postby versacehobo » Fri May 25, 2018 7:24 pm

Thanks, Jim.

Yeah, i know it's not ideal, but for sake of ease i think i can live with it.

Ultimately, I'd like to utilise the flex fuel capabilities of a standalone ECU, but my fear is that once I've tried e85 (or any significant partial ethanol blend), i'll be so unhappy with the performance on straight 93oct that I'll need endeavour to run e85 100% of the time...

3.5" downpipe should be no problem given my modified gearbox mount (I believe there is space for a 4").

Any other 07K guys on here except for Jim?
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Re: Best 550whp 07K turbo?

Postby audifreakjim » Sat May 26, 2018 12:16 am

I’d tell you to go one step smaller to help spool, but you don’t want to neuter the car for when you do try the corn :)
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Re: Best 550whp 07K turbo?

Postby versacehobo » Sat May 26, 2018 1:25 am

Can you provide any logs or data for boost profiles in 3rd or 4th gear, Jim?

Interested to see when your car starts to come alive.
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Re: Best 550whp 07K turbo?

Postby audifreakjim » Sat May 26, 2018 11:59 am

versacehobo wrote:Can you provide any logs or data for boost profiles in 3rd or 4th gear, Jim?

Interested to see when your car starts to come alive.


I run a quick spool valve and t4 divided housing. It spoils fast. In 6th gear it will make 1bar by 3300 rpms. 3rd gear is around 4300 for full boost
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Re: Best 550whp 07K turbo?

Postby versacehobo » Sat May 26, 2018 6:15 pm

How many kPa is full boost?
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Re: Best 550whp 07K turbo?

Postby audifreakjim » Tue May 29, 2018 1:03 pm

2.2 bar on 07k cams

1.85 bar on ttrs cams

Here is a 3rd gear dyno pull on the stock 07k cams and valves.
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