3.8L VTG GT2 Upgrade Taking Shape...
wow. awesome thread !
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#TeamAIM
997TT SilverSpool - 210.8 mph 1/2 Mile WR Apr 2019, 9.2 @ 168 mph 1/4 Mile Manual World Record , 3.15 60-130 mph , 2.72 100-150 mph , 1400whp E85
996TT SpoolBus - 204.6 mph 1/2 Mile 996TT WR Aug 2018, 9.5 @ 154 mph, 3.23 60-130 mph, 2.5 100-150 mph Manual Porsche World Record, 1400whp E85
997TT SlowBerry - 205.0 mph 1/2 Mile WR Nov 2018, 9.7 @ 170 mph 1/4 Mile , 3.2 60-130 mph , 2.4 100-150 mph , 1420whp E85
ESMOTOR | DO88 | TPC DSC | SYVECS | COBB | IPD | KLINE | XONA | AMS | ID | ERP | SACHS | TURBOSMART | CSF | DODSON |
#TeamAIM
997TT SilverSpool - 210.8 mph 1/2 Mile WR Apr 2019, 9.2 @ 168 mph 1/4 Mile Manual World Record , 3.15 60-130 mph , 2.72 100-150 mph , 1400whp E85
996TT SpoolBus - 204.6 mph 1/2 Mile 996TT WR Aug 2018, 9.5 @ 154 mph, 3.23 60-130 mph, 2.5 100-150 mph Manual Porsche World Record, 1400whp E85
997TT SlowBerry - 205.0 mph 1/2 Mile WR Nov 2018, 9.7 @ 170 mph 1/4 Mile , 3.2 60-130 mph , 2.4 100-150 mph , 1420whp E85
ESMOTOR | DO88 | TPC DSC | SYVECS | COBB | IPD | KLINE | XONA | AMS | ID | ERP | SACHS | TURBOSMART | CSF | DODSON |
We've already reached more power then that car, before the 3.8L....
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Joined: Jun 2008
Posts: 1,041
From: Warsaw
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The plan right now is to stick with the stock cams. We like the shape of the power curve they're producing so far with the 68mm VTG's so we'd like to see how far we can take that. Also...keep in mind, our power target isn't over 1000hp, so the stock cam profile should be adequate.
We think that at 8000 rpm's the stock lifters will be just fine. Remember, this car won't see rpm's that high for prolonged periods of time like a race car would. Besides, the 8000 rpm target was just a preliminary number. We're going to rev to wherever we make peak power. That may be 8000, it maybe 7700, or less....we won't really know until tuning starts. But we won't go beyond 8000.
We think that at 8000 rpm's the stock lifters will be just fine. Remember, this car won't see rpm's that high for prolonged periods of time like a race car would. Besides, the 8000 rpm target was just a preliminary number. We're going to rev to wherever we make peak power. That may be 8000, it maybe 7700, or less....we won't really know until tuning starts. But we won't go beyond 8000.
stock cams create high back pressure, you should think about longer duration and higher lift, remember my engine produced 760Ps on maha dyno on 1,1 bar boost.
I think stock lifters are too heavy to rev 8000rpm safely.
We've already reached more power then that car, before the 3.8L....
but u do have a better VTG's ur 68mm are 10X more promising
i'd listen to karol's advice regarding the cams and lifters
OK...back from the dead!! 
Today will be a day of many updates, as we FINALLY got some critical parts that we were waiting for wrap up this project. I'll post some more details about that throughout the day, so keep checking back. There will be updates on the fueling kit, engine internals (the best part), and for now we'll talk about the suspension.
This GT2 is getting nothing but the best, so for the suspension we decided to upgrade to our new Champion Motorsport adjustable rear upper links (dogbones), rear adjustable toe-steer arm, adjustable tie-rod, and we'll be adding our new adjustable caster arms as well.
Stay tuned for more updates throughout the day....
Today will be a day of many updates, as we FINALLY got some critical parts that we were waiting for wrap up this project. I'll post some more details about that throughout the day, so keep checking back. There will be updates on the fueling kit, engine internals (the best part
), and for now we'll talk about the suspension.This GT2 is getting nothing but the best, so for the suspension we decided to upgrade to our new Champion Motorsport adjustable rear upper links (dogbones), rear adjustable toe-steer arm, adjustable tie-rod, and we'll be adding our new adjustable caster arms as well.
Stay tuned for more updates throughout the day....
Here's another update. I posted another thread on it, but this car will be getting the first set of ACTUAL 997 Turbo Carrillo connecting rods. Here's a few pictures...but you can read more about what makes them so special here:
https://www.6speedonline.com/forums/...ting-rods.html
https://www.6speedonline.com/forums/...ting-rods.html
Registered User
Joined: Dec 2010
Posts: 497
From: South FLA
Rep Power: 38
Setting the bar!
Tom:
I appreciate seeing the end products. The 1st (as far as I know) 997 rod rather than a modified 996 to fit the 997.
CMS is settling for nothing less than perfect.
It is very nice to hear that due to various suspension and drive trane components the "widow maker" has lost it venomous bite under hard accelleration, hard braking, and top end runs
.
Keep it up! Slow
I appreciate seeing the end products. The 1st (as far as I know) 997 rod rather than a modified 996 to fit the 997.
CMS is settling for nothing less than perfect.
It is very nice to hear that due to various suspension and drive trane components the "widow maker" has lost it venomous bite under hard accelleration, hard braking, and top end runs
.Keep it up! Slow
Last edited by Slow911TT68Tip; Jul 27, 2011 at 06:56 PM.
Another round of updates for today. This one will focus on some pretty unique updates/upgrades that were done to the engine cases while apart.
In any higher HP scenario, the engine cases are often stressed beyond what the manufacturer might have originally intended. One of the most obvious signs of this is called "fretting". Fretting occurs when they two halves of the engine case are under enough stress that the two halves basically start to shift against each other. The picture below shows evidence of where you can see this was happening on this GT2's engine. This engine never saw more then 675 whp...so imagine what's happening to higher HP engines.
To stop any future fretting of the case halves, each main bearing throug-bolt bore has been reamed true, and then fitted with anti-shuffle guide sleeves to keep the two case halves perfectly aligned under any stresses. After this machining process is completed, the main oil galleys are then unplugged, threaded and machined to allow easier cleaning of any metal particles or shavings that might have fallen in during machining.
Lastly, each main bearing web is hand ported and reshaped for more efficient windage. Windage refers to the resistance each piston encounters as it travels up and down the cylinder. By porting the webs, you reduce that resistance and reduce the amount of resistance on the pistons. The #4 main web, which is normally sealed, has also been opened, to equalize resistance across all cylinders.
More updates coming soon. The big day is coming very soon....
In any higher HP scenario, the engine cases are often stressed beyond what the manufacturer might have originally intended. One of the most obvious signs of this is called "fretting". Fretting occurs when they two halves of the engine case are under enough stress that the two halves basically start to shift against each other. The picture below shows evidence of where you can see this was happening on this GT2's engine. This engine never saw more then 675 whp...so imagine what's happening to higher HP engines.
To stop any future fretting of the case halves, each main bearing throug-bolt bore has been reamed true, and then fitted with anti-shuffle guide sleeves to keep the two case halves perfectly aligned under any stresses. After this machining process is completed, the main oil galleys are then unplugged, threaded and machined to allow easier cleaning of any metal particles or shavings that might have fallen in during machining.
Lastly, each main bearing web is hand ported and reshaped for more efficient windage. Windage refers to the resistance each piston encounters as it travels up and down the cylinder. By porting the webs, you reduce that resistance and reduce the amount of resistance on the pistons. The #4 main web, which is normally sealed, has also been opened, to equalize resistance across all cylinders.
More updates coming soon. The big day is coming very soon....
Registered User
Joined: Dec 2010
Posts: 497
From: South FLA
Rep Power: 38
I surely hope not! Hats off to the CMS crew. They have not left a stone unturned.
!!!! hope the best for you !!
