997 Turbo / GT2 2006–2012 Turbo discussion on the 997 model Porsche 911 Twin Turbo.

GT3076 .63 ars

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Old 03-13-2010 | 08:27 AM
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GT3076 .63 ars

do i need to upgrade the fuel pump and the injecters if i have GT3076 ??

am running stock fuel pump and never upgrade the injecters

thanks
yousef
 
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Old 03-13-2010 | 09:28 AM
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Sorry I don't have your answer, but another Q - do you know the spool(rpm)/power difference between a .63 and a .82 A/R on a 997 GT30 car? I imagine you considered both options, so you may know off the top of your head... thks!
 
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Old 03-13-2010 | 09:42 AM
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higher a/r = more top end power in sacrifice of spool
 
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Old 03-13-2010 | 02:51 PM
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Originally Posted by MorePSiTehBett4
higher a/r = more top end power in sacrifice of spool
Sure but how many RPM difference for full boost, and any loss of power at lower RPMs? I'll check around for a dyno with the 2 turbos plotted against each other...

Free bump for the original poster - and sorry for the hijack.
 
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Old 03-13-2010 | 10:55 PM
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????
 
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Old 03-14-2010 | 04:40 AM
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should be around 200 rpms.
 
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Old 03-14-2010 | 10:33 AM
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can't really say without firsthand experience but 200-500rpm should be the window and obviously setup dependent as some cars respond differently(but that's another debate).
 
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Old 03-15-2010 | 08:37 AM
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Hi Yousef.

The factory injectors in the 997tt were tested with the GT3071/.63 ARs to 1.65 bar where they were at 100% duty cycle on MS109 fuel. Anything higher you will need to step up the injectors a set that flows more. Go with 80 lb injectors. The factory pumps are strong on the 997tt and ave been tested up to 2.1 bar without running out of fuel pressure even when running the Gt3076/.63 ARs.

Never tested the GT3076/.63 ARs but the boost level will be close to that - maybe a little lower. If you are running GT3076 turbos, to be safe I would upgrade the injectors at anything over 1.5 bar.

If you have a Durametric cable and their software (get info on this at durametric.com) (you can pick up one of these cables from Todd @ Protomotive) you can run a data log while you are under full throttle at various boost pressures and watch your injector milliseconds and see when they are at 100% duty cycle. Start your test at 1.4 bar and work your way up in .1 bar increments until you reach 100% on the injectors. Once you find the max limit, turbo down the boost by .1 just to be safe and thats where I would run the car.

What boost pressure are you running and whats the config of your turbo now - still the same?

Keith

Originally Posted by ysfg35
do i need to upgrade the fuel pump and the injecters if i have GT3076 ??

am running stock fuel pump and never upgrade the injecters

thanks
yousef
 
  #9  
Old 03-17-2010 | 09:25 AM
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Originally Posted by keithta
Hi Yousef.

The factory injectors in the 997tt were tested with the GT3071/.63 ARs to 1.65 bar where they were at 100% duty cycle on MS109 fuel. Anything higher you will need to step up the injectors a set that flows more. Go with 80 lb injectors. The factory pumps are strong on the 997tt and ave been tested up to 2.1 bar without running out of fuel pressure even when running the Gt3076/.63 ARs.

Never tested the GT3076/.63 ARs but the boost level will be close to that - maybe a little lower. If you are running GT3076 turbos, to be safe I would upgrade the injectors at anything over 1.5 bar.

If you have a Durametric cable and their software (get info on this at durametric.com) (you can pick up one of these cables from Todd @ Protomotive) you can run a data log while you are under full throttle at various boost pressures and watch your injector milliseconds and see when they are at 100% duty cycle. Start your test at 1.4 bar and work your way up in .1 bar increments until you reach 100% on the injectors. Once you find the max limit, turbo down the boost by .1 just to be safe and thats where I would run the car.

What boost pressure are you running and whats the config of your turbo now - still the same?

Keith
thanks bro ...

in fact am going to boost 1.6 this time ,, so am afraid that i need big injecters .. thats why i asked to make sure that am not wastin my money ... !!!

now i drive the car in 1.2 bar all the time ,, with the meth system i ran 1.4 ,, the car was really great .. have some issues leakin boost ... but its fine ...
thanks
yousef
 
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Old 03-17-2010 | 10:19 AM
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I would at 1.6 bar just to be safe. You will need to get the car re-flashed with a new tune file adjusted for the larger injectors as well. Check with Protomotive on that. Good Luck.

Keith

Originally Posted by ysfg35
thanks bro ...

in fact am going to boost 1.6 this time ,, so am afraid that i need big injecters .. thats why i asked to make sure that am not wastin my money ... !!!

now i drive the car in 1.2 bar all the time ,, with the meth system i ran 1.4 ,, the car was really great .. have some issues leakin boost ... but its fine ...
thanks
yousef
 
  #11  
Old 03-17-2010 | 10:23 AM
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Originally Posted by keithta
I would at 1.6 bar just to be safe. You will need to get the car re-flashed with a new tune file adjusted for the larger injectors as well. Check with Protomotive on that. Good Luck.

Keith
yes sure i will do .. thanks bro .. you are really kind person
 
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Old 03-17-2010 | 10:24 AM
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Hi,

I would run 60lb injectors with an extra pump in line. You will be good up to and around high 700 to low 800 WHP.

Kindest
 
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Old 03-18-2010 | 11:35 AM
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Originally Posted by Betim@BBIAutosport
Hi,

I would run 60lb injectors with an extra pump in line. You will be good up to and around high 700 to low 800 WHP.

Kindest
thnx alot man for your answer .. but i think goin to 80 lb injecters is safe with new tune
thanks alot
 
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Old 03-18-2010 | 11:39 AM
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I believe the 997tt factory injectors are 60 lb stock. The factory twin pumps in the tank are good for over 800 whp easy (already tested).

Keith

Originally Posted by Betim@BBIAutosport
Hi,

I would run 60lb injectors with an extra pump in line. You will be good up to and around high 700 to low 800 WHP.

Kindest
 
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Old 03-19-2010 | 01:50 AM
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with the meth system i ran 1.4 ,, the car was really great .. have some issues leakin boost ... but its fine ...

Are you running straight methanol or 50/50 mixed with water?
 


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