Anyone running GMG WC Sport Header?
12-05-2011, 10:58 PM
#46
Burning Brakes
[quote=997gt3north;9077503]
Good point.
I ran the car for about 25 miles before the 'after cat delete' dyno.
I was thinking perhaps it should have adjusted by then.
Weird thing is I actually gained about 5 HP on lower revs. I was expecting otherwise.
Cheers
I thought so too.
I thought it was a no brainer to achieve some gains by eliminating the cats.
But the dyno proved me wrong.
Shame as the seen in the pics below - it looked pretty good.
Cheers
I have one question based on dyno experience with my gt3. Did you give your car enough time to adapt to the change? I say this because I myself posted some dyno results a few years ago when I trialed the FVD software and the Sharwerks rear delete exhaust. When I did did the exhaust and FVD software, the Car's computer quickly pulled the car into safer timing tables because it recognized 'something' had changed - the GT3 factory software has numerous timing tables to adjust for fuel type / temp / etc etc. After i ran the car for a few days - and specifically did a few WOT runs on the highway, when I re-dynoed the car, the car showed about a 5hp improvement - and no longer a 5 hp loss. When you look at the Factory A/F ratio it is spot on perfect for a NA engine - there are however timing tables that can be possibly further tweaked to benefit from higher Octane. I did my test on 94 Octane, and with the FVD software + Sharwerks rear exhaust + adaptation time = about 5hp at the wheels (that was my experience).
It is very possible your headers were not good, but no cats 'should' allow HP gains in the very high rpm range - but if the car is not above 6500 rpms all the time, the car may in fact be slower given the loss at the low end
I thought it was a no brainer to achieve some gains by eliminating the cats.
But the dyno proved me wrong.
Shame as the seen in the pics below - it looked pretty good.
Cheers
I have one question based on dyno experience with my gt3. Did you give your car enough time to adapt to the change? I say this because I myself posted some dyno results a few years ago when I trialed the FVD software and the Sharwerks rear delete exhaust. When I did did the exhaust and FVD software, the Car's computer quickly pulled the car into safer timing tables because it recognized 'something' had changed - the GT3 factory software has numerous timing tables to adjust for fuel type / temp / etc etc. After i ran the car for a few days - and specifically did a few WOT runs on the highway, when I re-dynoed the car, the car showed about a 5hp improvement - and no longer a 5 hp loss. When you look at the Factory A/F ratio it is spot on perfect for a NA engine - there are however timing tables that can be possibly further tweaked to benefit from higher Octane. I did my test on 94 Octane, and with the FVD software + Sharwerks rear exhaust + adaptation time = about 5hp at the wheels (that was my experience).
It is very possible your headers were not good, but no cats 'should' allow HP gains in the very high rpm range - but if the car is not above 6500 rpms all the time, the car may in fact be slower given the loss at the low end
I ran the car for about 25 miles before the 'after cat delete' dyno.
I was thinking perhaps it should have adjusted by then.
Weird thing is I actually gained about 5 HP on lower revs. I was expecting otherwise.
Cheers
12-07-2011, 08:35 PM
#47
12-07-2011, 10:28 PM
#50
Nordschleife Master
Ar eyou in central florida?
I had mine dynoed with sharkwerks track, no ecu, stock headers
12-07-2011, 11:01 PM
#52
Admin
Lifetime Rennlist
Member
Lifetime Rennlist
Member
12-07-2011, 11:39 PM
#53
Burning Brakes
Join Date: Oct 2005
Location: FL
Posts: 1,074
Likes: 0
Received 0 Likes
on
0 Posts
Izzone, yep I am located in Tampa. I got my got less than a week ago. I got the Shark bypass, and it sounds amazing. But I am looking for the extra noise punch or something like the cup car.
12-08-2011, 12:29 AM
#54
Race Director
Love your car...hope to see it and meet you around Tampa soon. I'm going over to Sebring this Saturday afternoon to run on Sunday. If you're bored and want to follow over let me know. I plan on leaving around noon or so on Saturday.
12-08-2011, 12:31 AM
#55
Basic Sponsor
Rennlist
Site Sponsor
Rennlist
Site Sponsor
Guys,
We have several clients that have our WC header system and in fact, we installed one at the track for a client in the FL area when we ran the 48 hours of Sebring PCA event this past Feb on Grady's GT3.
Grady Willingham, who I know runs quite a bit with PBOC down in the southeast, is a great guy so please feel free to ask him how he likes his GMG headers and muffler system.
There are many more as well and as always, you can email me for any specifics.
Regards,
James
GMG
We have several clients that have our WC header system and in fact, we installed one at the track for a client in the FL area when we ran the 48 hours of Sebring PCA event this past Feb on Grady's GT3.
Grady Willingham, who I know runs quite a bit with PBOC down in the southeast, is a great guy so please feel free to ask him how he likes his GMG headers and muffler system.
There are many more as well and as always, you can email me for any specifics.
Regards,
James
GMG
__________________
James F. Sofronas | President & Owner
Global Motorsports Group ™
E: james@gmgracing.com
P: +1 (714) 432-1582
F: +1 (714) 432-1590
A: 3210 South Shannon Street, Santa Ana, California 92704
W: gmgracing.com
James F. Sofronas | President & Owner
Global Motorsports Group ™
E: james@gmgracing.com
P: +1 (714) 432-1582
F: +1 (714) 432-1590
A: 3210 South Shannon Street, Santa Ana, California 92704
W: gmgracing.com
12-08-2011, 12:37 AM
#56
Basic Sponsor
Rennlist
Site Sponsor
Rennlist
Site Sponsor
Regarding the respective dyno sheets and the varying gains you are seeing, well it's hard to compare different dynos with different factors/conditions when dyno'ing a specific car.
The first dyno from RUF was an independent run with our products on their dyno. We didn't even know they were doing it until they showed us the sheet and the client expressed a great level of satisfaction after he drove it for the first time.
For the most part, our clients with our GMG WC Headers and Center Section are seeing between 20-30 flywheel HP gains on average.
In fact, we just dyno'd a 2007 GT3 with our system and it gained close to 15 wheel HP (our dyno is very conservative) and matched that of the stock dyno run of a 2010 Red GT3 that we just got in the shop.
So 415 to 435 flywheel is about what we are seeing on the 997.1 systems and closer to a 30hp gain from the 3.8 systems when installed.
Look for more info from both of these cars on more posts in this sections.
Thanks,
James
GMG
The first dyno from RUF was an independent run with our products on their dyno. We didn't even know they were doing it until they showed us the sheet and the client expressed a great level of satisfaction after he drove it for the first time.
For the most part, our clients with our GMG WC Headers and Center Section are seeing between 20-30 flywheel HP gains on average.
In fact, we just dyno'd a 2007 GT3 with our system and it gained close to 15 wheel HP (our dyno is very conservative) and matched that of the stock dyno run of a 2010 Red GT3 that we just got in the shop.
So 415 to 435 flywheel is about what we are seeing on the 997.1 systems and closer to a 30hp gain from the 3.8 systems when installed.
Look for more info from both of these cars on more posts in this sections.
Thanks,
James
GMG
12-08-2011, 01:50 AM
#57
Race Director
Guys,
We have several clients that have our WC header system and in fact, we installed one at the track for a client in the FL area when we ran the 48 hours of Sebring PCA event this past Feb on Grady's GT3.
Grady Willingham, who I know runs quite a bit with PBOC down in the southeast, is a great guy so please feel free to ask him how he likes his GMG headers and muffler system.
There are many more as well and as always, you can email me for any specifics.
Regards,
James
GMG
We have several clients that have our WC header system and in fact, we installed one at the track for a client in the FL area when we ran the 48 hours of Sebring PCA event this past Feb on Grady's GT3.
Grady Willingham, who I know runs quite a bit with PBOC down in the southeast, is a great guy so please feel free to ask him how he likes his GMG headers and muffler system.
There are many more as well and as always, you can email me for any specifics.
Regards,
James
GMG
12-08-2011, 06:04 AM
#58
Nordschleife Master
Izzone, yep I am located in Tampa. I got my got less than a week ago. I got the Shark bypass, and it sounds amazing. But I am looking for the extra noise punch or something like the cup car.
I will replace headers and cats when thd time comes. My dealer said I need stock cats for now for waresnty
12-08-2011, 08:35 AM
#59
Race Director
2 local dealers told me and I confirmed with PCNA that if I do after market headers/cats.....Porsche will void the engine/powertrain warranty....especially if I tamper with the ECU.
So if you want to keep the warranty DO NOT use after markey headers/cats and DO NOT tamper with the ECU!
12-08-2011, 08:57 AM
#60
Burning Brakes
Join Date: Oct 2005
Location: FL
Posts: 1,074
Likes: 0
Received 0 Likes
on
0 Posts
MDRums, PM me sometime. I can't go this weekend. I am busy this weekend, so I can't go to Sebring, but thanks for the invite.
I want the Warranty, so I will keep my car as is.
I want the Warranty, so I will keep my car as is.