996GT2 (or TT x50) - UMW Stage 1 Reflash / Exhaust / Wastegates
06-25-2014, 07:02 PM
#1
Rennlist Member
Thread Starter
996GT2 (or TT x50) - UMW Stage 1 Reflash / Exhaust / Wastegates
I figured I would post this over here as well since those of you with the x50 package may find it useful.
I picked up my 996gt2 recently and felt I needed to do a few things to keep the car true to it's name and not go over the top. I've been toying with the idea of using Kevin @ UMW for some time and after speaking with a few local friends and several board members, I decided to pull the trigger.
Kevin provided me with the following:
-1bar Wastegates
-Upgraded coil packs
-Spark Plugs
-Reflash Dongle / Tune
-Bosch Diverter Valves (710N I believe)
-UMW "Quiet" exhaust w/200 cell cats
I picked up a Bosch 5bar from another member.
I had my local shop (Boreham Motorsports in Tempe, AZ) take care of the install as well as a full fluid service. While at the shop we also replaced the primary o2 sensors, transmission mounts with 997 model and a leaking reverse switch. I added the Raid steering wheel I picked up from another member, too.
To document the process, I did a before / after dyno. The car being 100% stock at the time of the initial run and having all the above-listed parts installed during the latter run.
My thoughts:
The car feels much more responsive, picks up quicker and has much more mid-range than it did before. I feel it should have been this way from the factory, it feels great, especially for a stock K24 setup.
Dyno Run Disclaimer:
-There was no cooling, no fans on the intercoolers, no efficient way to cool off the car on both sets of runs; therefore, the car was heat soaking, not breathing it's best, and sucking in a ton of hot air.
-To prevent timing / detonation, I mixed in 5 gallons of MS109 and filled the tank with 91. Octane rating is approximately 95-96 (assuming 5 gallons of 109 to 11 gallons of 91). We did this simply due to lack of air flow at Kevin's recommendation.
-Best run made 487hp/483ftlbs before pulling a lot of timing after 6k RPM. Again, no airflow.
-Boost was a solid 1.1 Bar
-Temperature was 105 degrees F on stock run and 100 degrees on UMW run, 6% humidity. SAE 1.05 on the stock run and SAE 1.04 on the UMW run.
-Roughly 60 miles on it since reflash, adaptions may not be 100%, but car was feeling solid.
Stock: 436hp / 416ftlbs
UMW: 478hp / 468ftlbs
Best: 487hp / 483ftlbs
42hp and 52ftlbs
~400RPM pickup in response and spool
51hp and 67ftlbs if I use the "best" map which was pulling timing at 6k.
Given my horrible conditions, butt-dyno tells me the car is much happier when it's getting airflow. The difference over stock is night and day. I would estimate the numbers are closer to the 51hp / 67ftlbs range and my guestimates on power were almost dead on. I figured 50hp and 70ftlbs. When it cools off in November, I'll take it back for another dyno.
Overall:
Kevin is a stand up guy. The car is much more responsive better, it sounds much better thanks to the work Kevin has put into the exhaust. I am much happier with how the car responds under throttle, especially mid range where it was lacking pep before. I think this is a great option for anyone looking for a little more out of the car without going the clutch, injector, turbo, intercooler, plenum, route.
More importantly, Kevin's customer service is outstanding. For those of you who have worked with him, you know it's never a short phone call if you don't want it to be and he enjoys talking about the industry (as do I). I've never had to wait more than a few hours for an e-mail response and I can usually reach him pretty easy during shop hours via phone.
I picked up my 996gt2 recently and felt I needed to do a few things to keep the car true to it's name and not go over the top. I've been toying with the idea of using Kevin @ UMW for some time and after speaking with a few local friends and several board members, I decided to pull the trigger.
Kevin provided me with the following:
-1bar Wastegates
-Upgraded coil packs
-Spark Plugs
-Reflash Dongle / Tune
-Bosch Diverter Valves (710N I believe)
-UMW "Quiet" exhaust w/200 cell cats
I picked up a Bosch 5bar from another member.
I had my local shop (Boreham Motorsports in Tempe, AZ) take care of the install as well as a full fluid service. While at the shop we also replaced the primary o2 sensors, transmission mounts with 997 model and a leaking reverse switch. I added the Raid steering wheel I picked up from another member, too.
To document the process, I did a before / after dyno. The car being 100% stock at the time of the initial run and having all the above-listed parts installed during the latter run.
My thoughts:
The car feels much more responsive, picks up quicker and has much more mid-range than it did before. I feel it should have been this way from the factory, it feels great, especially for a stock K24 setup.
Dyno Run Disclaimer:
-There was no cooling, no fans on the intercoolers, no efficient way to cool off the car on both sets of runs; therefore, the car was heat soaking, not breathing it's best, and sucking in a ton of hot air.
-To prevent timing / detonation, I mixed in 5 gallons of MS109 and filled the tank with 91. Octane rating is approximately 95-96 (assuming 5 gallons of 109 to 11 gallons of 91). We did this simply due to lack of air flow at Kevin's recommendation.
-Best run made 487hp/483ftlbs before pulling a lot of timing after 6k RPM. Again, no airflow.
-Boost was a solid 1.1 Bar
-Temperature was 105 degrees F on stock run and 100 degrees on UMW run, 6% humidity. SAE 1.05 on the stock run and SAE 1.04 on the UMW run.
-Roughly 60 miles on it since reflash, adaptions may not be 100%, but car was feeling solid.
Stock: 436hp / 416ftlbs
UMW: 478hp / 468ftlbs
Best: 487hp / 483ftlbs
42hp and 52ftlbs
~400RPM pickup in response and spool
51hp and 67ftlbs if I use the "best" map which was pulling timing at 6k.
Given my horrible conditions, butt-dyno tells me the car is much happier when it's getting airflow. The difference over stock is night and day. I would estimate the numbers are closer to the 51hp / 67ftlbs range and my guestimates on power were almost dead on. I figured 50hp and 70ftlbs. When it cools off in November, I'll take it back for another dyno.
Overall:
Kevin is a stand up guy. The car is much more responsive better, it sounds much better thanks to the work Kevin has put into the exhaust. I am much happier with how the car responds under throttle, especially mid range where it was lacking pep before. I think this is a great option for anyone looking for a little more out of the car without going the clutch, injector, turbo, intercooler, plenum, route.
More importantly, Kevin's customer service is outstanding. For those of you who have worked with him, you know it's never a short phone call if you don't want it to be and he enjoys talking about the industry (as do I). I've never had to wait more than a few hours for an e-mail response and I can usually reach him pretty easy during shop hours via phone.
06-25-2014, 07:26 PM
#2
Kevin is a great guy. He did my track set up based on his K16/GT2RS zero clearance turbos, injectors, and his 1.3bar 7200rpm ECU. I am running this in conjunction with a RUF intake manifold, RUF turbo intake pipes, and a RUF 100cell cat exhaust. My car pull a solid 1.3 bar all day on his aggressive 91 octane tune. One of these days I'll get it on a dyno. Kevin is the man when it comes to these cars..
06-25-2014, 10:59 PM
#6
06-25-2014, 11:56 PM
#7
Trending Topics
06-26-2014, 12:02 AM
#8
Rennlist Member
Thread Starter
Haha. Car is running great, dare I say much better than on dyno.
It was 113 earlier today and she was going strong.
I know I'd pick up a good 3-5% if it were cooler.
It was 113 earlier today and she was going strong.
I know I'd pick up a good 3-5% if it were cooler.
06-26-2014, 12:09 AM
#9
definitely better on road than any dyno, (although I'm using EPL tuning) also agree on power % gain for cool days.
I'd say 5% is on the table for a 20C temp drop (40C vs 20C), which the relatively small gains show good(and likely conservative/smart) tuning IMO
Fast all-day, any day, on 91oct is good living
I'd say 5% is on the table for a 20C temp drop (40C vs 20C), which the relatively small gains show good(and likely conservative/smart) tuning IMO
Fast all-day, any day, on 91oct is good living
06-26-2014, 11:07 AM
#10
As the air temperature is increased, its density decreases (PV = nRT). Therefore, if the temperature of the ambient air is increased, the turbocharger now must do more work (spin faster) in order to provide the engine with the same amount of oxygen. As temperatures continue to increase, the turbocharger can no longer increase its speed efficiently and therefore can no longer provide the engine with the same amount of oxygen. This results in a loss of power.
06-26-2014, 11:18 AM
#11
well that was helpful... 
I realize the effects of heat, I was curious why you said THESE cars don't like heat, ie. yours 'overheats', IAT through the roof, low oil pressure, brake fade, your paint is melting
etc etc...
Some cars/brand don't stand heat well, and was interested why you made that statement about 996TT's.
I realize the effects of heat, I was curious why you said THESE cars don't like heat, ie. yours 'overheats', IAT through the roof, low oil pressure, brake fade, your paint is melting
etc etc...Some cars/brand don't stand heat well, and was interested why you made that statement about 996TT's.
