997 Turbo / GT2 2006–2012 Turbo discussion on the 997 model Porsche 911 Twin Turbo.
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100-200kmh and 60-130mph modified vtg

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Old May 11, 2018 | 01:06 PM
  #136  
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Originally Posted by SamboTT@ByDesign
I believe the HTZ has a 52mm inducer. Same that you will find in the base XR770 or Alpha 28. Moves a lot of air!
That's huge compared to what I run now: 48.5 mm. We tried a mm larger 2 years ago but these sucked big time. Yours seem to work very well.
 
Old May 11, 2018 | 01:35 PM
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Here are some installation pictures from the last 2 weeks. Today I finished the electrical work and tomorrow I will start the system up and test the nozzles.
 
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Old May 12, 2018 | 02:53 AM
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Originally Posted by GT996
Here are some installation pictures from the last 2 weeks. Today I finished the electrical work and tomorrow I will start the system up and test the nozzles.
When some WMI makers advice to have the pump located lower than fuel tank, wouldn't be better to rotate your pump to keep the fuel lines at the bottom?
 
Old May 12, 2018 | 04:06 AM
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Originally Posted by Tiago
When some WMI makers advice to have the pump located lower than fuel tank, wouldn't be better to rotate your pump to keep the fuel lines at the bottom?
Yes, but the other theory is that air bubbles could then be trapped in the pump. I decided to go that way because that's how some WMI makers install them. The "pipe" length to the tank is like 15 cm or so (sse pic). The pump won't have any problems to get fluid - in fact I tested it already and it just primed perfectly from empty to full flow within 5 seconds.
 
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Old Jun 13, 2018 | 12:34 AM
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I had a lot of little hardware bugs to fix and time went by waiting for parts, but the project is moving forward now.

100-200 kph 4.7 and 60-130mph 5.5 on a flat surface with almost full fuel tank. No brake boosting or any tricks, just pedal to the metal in 4th.

IAT is now down do 37.5 degrees C at 308 kph, which is really great.

770 hp and 1060 Nm is not too bad for VTG turbos - I think I will not get my 800, but I have one or two things left over to try.
 
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Old Jun 13, 2018 | 10:59 AM
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Lovely work, what is it doing if you start in 3rd?

Rick
 
Old Jun 13, 2018 | 12:33 PM
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Originally Posted by RickRST
Lovely work, what is it doing if you start in 3rd?

Rick
Thanks. In 3rd I get exactly the same 100-200 time. Shifting in 3-4/10ths and immediate acceleration in 4th, but I land exactly on the line of 4th gear as if I would use just 4th.

If I would make a bet with the gearbox, I probably could gain 1/10, but not more.
 
Old Jun 13, 2018 | 12:56 PM
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Impressive VTG GT996

I need to try a 60-130 on of these days...my 60-100 is 2.5 sec in nice weather.
 
Old Jun 13, 2018 | 04:09 PM
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Originally Posted by M3 Maestro
Impressive VTG GT996

I need to try a 60-130 on of these days...my 60-100 is 2.5 sec in nice weather.
Thank you. 2.5 is moving
 
Old Jun 13, 2018 | 04:13 PM
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The car is ready now. I found some more hp and am down to 4.6 seconds 100-200 kph and 5.4 seconds 60-130 mph.

786 hp and 1080 Nm - that's it. Not too bad
 
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Old Jun 13, 2018 | 06:51 PM
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Originally Posted by GT996
The car is ready now. I found some more hp and am down to 4.6 seconds 100-200 kph and 5.4 seconds 60-130 mph.

786 hp and 1080 Nm - that's it. Not too bad
Where are you looking for this horsepower so I can look there too

Just curious what is your goal?
 
Old Jun 13, 2018 | 11:37 PM
  #147  
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Originally Posted by M3 Maestro
Where are you looking for this horsepower so I can look there too

Just curious what is your goal?
I found them in the engine bay

hp wise I wanted to see the 800 and missed that goal - which is just a number anyway. Yes, number cheating would have shown it, but that's not the way I am working. In the winter time we will have 800 hp with cooler and denser air, so that's fine. I could even get 800 hp in a single run, but the car may then struggle in these high speed runs above 200 mph. Backpressure is a nightmare with these VTGs. I would easily make 1000 hp with other turbos.

Next stop is TIAL turbos - or NOS . Maybe next year. I just wanted to see what VTGs am capable of and that's what I can do with them.
 
Old Jun 14, 2018 | 07:16 AM
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The calibration I have to get the 2.5sec 60-100mph run would not be the same as a 200mph calibration, I understand where you are coming from. Impressive results especially given the breath of capability you are trying to cover.

I'm also looking into what to do next. Done simulation with the new Garrett G660s and BW EFR 7163s. Would love to do simulation with Xonas...but no maps. For Xonas I have to rely on datalogs I collected from members nice enough to share. All these options are nice, all have their pros /cons.
 
Old Jun 14, 2018 | 10:43 AM
  #149  
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I mean, it's not that I can't . That's a time midway thru the project. Haven't done many 3rd gear pulls, but here is one and I bet I am quicker now, but that's only a guess until I try again. 2nd chart is 4th gear as of yesterday.
 
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Old Jun 18, 2018 | 07:46 AM
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Originally Posted by IMI A
We're getting consistent 2.6 secs 60-100mph on a map which gives us a consistent 16-17 secs 60- 300kph

On racefuel, big GT2 hybrid VTGS and no cats.
One notch down from my 2.5sec calibration it runs in the 2.6s, we are lining up pretty well (all #s using E85). Thanks for the info
 


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