thanks for the write-up and the pics on this and your teaser post.
I'm wondering why any of the 911 turbo kits don't require header wrap. my previous modded (non-porsche) turbo cars (late 80's/early 90's) all came with header wrap. i seem to remember the theory was to keep the heat in the header in order to maintain higher exhaust gas velocity for quicker turbo response.
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'07 997TT - Speed Yellow / Sea Blue - fabspeed exhaust, techart springs, gp7 wheels
'04 Cayenne S - Black / Black
'06 Cayenne S - Black / Black (Wife's SUV)
I have my 944 turbo's exhaust wholly wrapped, but the length of the exhaust tract from the exhaust ports to the turbine is very long - perhaps 3-4' of tubing. The path on all the 99x turbos might be so short that I would guess the radiative heat lost would be minimal, or perhaps retaining any more heat might actually be detrimental to the turbo bearings?
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08 Cayenne TT
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thanks for the write-up and the pics on this and your teaser post.
I'm wondering why any of the 911 turbo kits don't require header wrap. my previous modded (non-porsche) turbo cars (late 80's/early 90's) all came with header wrap. i seem to remember the theory was to keep the heat in the header in order to maintain higher exhaust gas velocity for quicker turbo response.
glofguy-
Good question. We don't wrap, but we use Swaintech Coatings for some of our Audi header applications. Their product is fantastic, so we had a set of our 997TT headers done to see if there were any worthwhile benefits.
There was zero difference in performance compared to the uncoated headers. Spool time was also the same.
Like Gene has said, on a vehicle with much longer plumbing, this would be a worthwhile mod. Coatings and wraps also work well on cars where hot pipes are in areas where a double wall header design was used from the factory. They can provide a great thermal barrier.
The headers on these cars are dangling from the bottom, so need to worry there.
In our professional opinion, no coating or wrapping necessary.
Hope this helps.
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Here is the car making its virgin run at the Texas Mile. No aerodynamic tricks used (tape, removal of wipers or mirrors), PSM left "ON" and into a headwind, and my "weak sauce" driving skillz (my 0-60 was 4.2 sec)
This was a strictly bolt-on kit with no special voodoo or antics required, and 100% or better than stock drivability and manners. No CEL lights on, no stumbling. By comparison, VRAlexander's CGT ran 177mph. Hats off to Mike and Todd for a great job on this!
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08 Cayenne TT
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Location: Jeez, it's was only 12 degrees this Morning...and it's only November!
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Nice run Gene. Am I reading this right? Around 28-29 seconds for 0-300 km/h? Do you think head winds made a big difference?
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07 997 Turbo
02 996 Turbo - gone, but not forgotten
"So a GTR is more than 2sec faster than a 997 turbo on a 1:40 ish lap by the same driver. Multiply that by 5, and the GTR is around 10sec faster than a turbo on the Nurb. Sounds right to me." - GT-R logic To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
The head winds were strong enough to wiggle the cars over the last 1/4 mile or so. from my aero calcs even a 10mph headwind would increase the drag by ~50hp. Also from the graph you can see that with a better launch (0-100kph in 3.x) the car would be at 27 sec for 0-300kph.
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08 Cayenne TT
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Location: Jeez, it's was only 12 degrees this Morning...and it's only November!
Age: 35
Posts: 1,694
Rep Power: 75
Quote:
Originally Posted by eclou
The head winds were strong enough to wiggle the cars over the last 1/4 mile or so. from my aero calcs even a 10mph headwind would increase the drag by ~50hp. Also from the graph you can see that with a better launch (0-100kph in 3.x) the car would be at 27 sec for 0-300kph.
Wow...40-41 seconds for a stock 997TT...we're talking 13-14 seconds faster?!?
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07 997 Turbo
02 996 Turbo - gone, but not forgotten
"So a GTR is more than 2sec faster than a 997 turbo on a 1:40 ish lap by the same driver. Multiply that by 5, and the GTR is around 10sec faster than a turbo on the Nurb. Sounds right to me." - GT-R logic To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Bobby yes it is quite a bit faster to 300kph than stock, and pretty close to the RT12. The fastest RT12 at the Texas Mile turned only 184, and the 996 Ruf RTurbo turned 181. Some european tests have been faster, but their temps are usually much cooler than here in TX. I cannot imagine how fast the car would have run in say 30-40F!
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08 Cayenne TT
07 997 tt To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Location: Jeez, it's was only 12 degrees this Morning...and it's only November!
Age: 35
Posts: 1,694
Rep Power: 75
Quote:
Originally Posted by HRTC
I assume you're running the stock clutch. You having any trouble with the clutch slipping?
Gene replaced his clutch long ago...the clutch was fine, but the pressure plate couldn't handle his AWE stage 2 kit on race fuel. If you do a search, it happened before a previous Texas mile event, if I remember.
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07 997 Turbo
02 996 Turbo - gone, but not forgotten
"So a GTR is more than 2sec faster than a 997 turbo on a 1:40 ish lap by the same driver. Multiply that by 5, and the GTR is around 10sec faster than a turbo on the Nurb. Sounds right to me." - GT-R logic To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Nothing escapes Bobby!! Yes I discovered the stock pressure plate could not handle the torque of the Stage II kit just 2 days before the 2007 Texas Mile. The upgraded Sachs Stage II clutch I got from AWE holds fine with no drivability changes
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08 Cayenne TT
07 997 tt To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Location: Jeez, it's was only 12 degrees this Morning...and it's only November!
Age: 35
Posts: 1,694
Rep Power: 75
Quote:
Originally Posted by eclou
Nothing escapes Bobby!! Yes I discovered the stock pressure plate could not handle the torque of the Stage II kit just 2 days before the 2007 Texas Mile. The upgraded Sachs Stage II clutch I got from AWE holds fine with no drivability changes
Sorry...didn't mean to beat you to the punch. I'm just so excited about this kit...all bolt on + software, 700ish HP. Crazy power. Sub 30 second 0-300 km/h !!!
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07 997 Turbo
02 996 Turbo - gone, but not forgotten
"So a GTR is more than 2sec faster than a 997 turbo on a 1:40 ish lap by the same driver. Multiply that by 5, and the GTR is around 10sec faster than a turbo on the Nurb. Sounds right to me." - GT-R logic To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
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