991.2 Base/S/GTS Modification & Race Track Prep Thread
09-09-2018, 02:41 PM
#241
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^^^ RAS delete your words not mine.
Why don't you like driving RAS, it delivers, free of charge 1.5 degrees of slip angle - thats a lot. I'll take that plus SPASM over unmatched sway bars and coilovers.
I suspect harness bars will be banned (unless built into a cage, obviously) - too many poorly installed - delivering the wrong angle at the shoulders.
So you have modded a car, all of which is unproven through testing on the car, will drive it at Sebring and then sell it?
Where is the track testing in all of this? The feed back loop?
What happened to the BGB approach as applied to the GT4?
To deliver a much improved suspension set up that delivers results on the clock requires a lot of work and testing - slap it in and hope is not the way I would do it.
Not trying to be a PITA, just curious as to why the apparent change in direction and the spray and wipe approach.
Why don't you like driving RAS, it delivers, free of charge 1.5 degrees of slip angle - thats a lot. I'll take that plus SPASM over unmatched sway bars and coilovers.
I suspect harness bars will be banned (unless built into a cage, obviously) - too many poorly installed - delivering the wrong angle at the shoulders.
So you have modded a car, all of which is unproven through testing on the car, will drive it at Sebring and then sell it?
Where is the track testing in all of this? The feed back loop?
What happened to the BGB approach as applied to the GT4?
To deliver a much improved suspension set up that delivers results on the clock requires a lot of work and testing - slap it in and hope is not the way I would do it.
Not trying to be a PITA, just curious as to why the apparent change in direction and the spray and wipe approach.
We are headed into our slow season and I am anxious to find a new home for the car for financial reasons but NOT before I drive it with all of the upgrades and bless it as a well handling Porsche. I drove it in stock form and it feels like every other single Cayman or 911 with stock parts; it's numb, it rolls a lot, needs more camber front and rear AND the brakes need help because they're super quick to overheat and run out of life. I'm just doing the cooling mods to be preemptive.
I'm going to add Castrol SRF and our tried and tested endurance racing brake pads to upgrade the brake package you asked about.
Where do you live? I'd love to let you try it out on track if you're near us.
09-09-2018, 03:37 PM
#242
Instructor
Advice or comments on Mods
Here is what a local shop has recommended to me. Car is 991.2 C2 without PSE or SC. Anyone care to weigh in on mods (even though not much detail) and, more importantly, your thoughts on suggested power gains. The point in doing this is to up the HP and improve exhaust sound without being obnoxious. Thanks for your input.
COBB Stage 1 tune
Akrapovic sport exhaust with high flow cats
IPD intake plenum
BMC performance intake air filter
Estimated power gain is about 100HP
COBB Stage 1 tune
Akrapovic sport exhaust with high flow cats
IPD intake plenum
BMC performance intake air filter
Estimated power gain is about 100HP
09-09-2018, 04:58 PM
#243
Here is what a local shop has recommended to me. Car is 991.2 C2 without PSE or SC. Anyone care to weigh in on mods (even though not much detail) and, more importantly, your thoughts on suggested power gains. The point in doing this is to up the HP and improve exhaust sound without being obnoxious. Thanks for your input.
COBB Stage 1 tune
Akrapovic sport exhaust with high flow cats
IPD intake plenum
BMC performance intake air filter
Estimated power gain is about 100HP
COBB Stage 1 tune
Akrapovic sport exhaust with high flow cats
IPD intake plenum
BMC performance intake air filter
Estimated power gain is about 100HP
I already have the COBB S1 the IPD and the AMS Intercoolers. I am thinking AKRA and Vektor Headers.
09-09-2018, 05:44 PM
#244
Instructor
I've been chatting with the Vetkor folks also and really want to do their headers. Any issue with Cobb regarding warning lights? Finally, do you think HP gains realistic based on mods or are they exaggerating a bit? Thanks for the reply.
Last edited by USGooner; 09-09-2018 at 05:46 PM. Reason: Duplicate
09-09-2018, 05:45 PM
#245
Instructor
I've been chatting with the Vetkor folks also and really want to do their headers. Any issue with Cobb regarding warning lights? Finally, do you think HP gains realistic based on mods or are they exaggerating a bit? Thanks for the reply.
09-09-2018, 09:58 PM
#247
Rennlist Member
I just ordered the kitchen sink with the intention of taking the car to Sebring in 2 weeks and then COTA in October for a DE where it will sit with a FOR SALE sticker. I'm at 6K on the odometer.
Car will have:
Cobb Stage I Flash
IPD Plenum
Cargraphic catless or catted bypass pipe
BMC Filter
PWR Radiators
AMS Intercoolers
H&R VVT Springs & Coilovers
Tarett Monoball everything
Upgraded GT3 sway bars & drop links
DSC PASM controller
MSI Wheel Studs & Lug Nuts
15mm / 7mm wheel spacers
BGB 4-point harness bar (yellow)
Schroth enduro belts (black & yellow)
Porsche GT2 carbon fiber bucket seats
I'm sure I'm forgetting something but if you know anyone looking for a track oriented 991.2 GTS with 5-lugs, no sunroof and RAS delete, there might be a commission in it for you.
Car will have:
Cobb Stage I Flash
IPD Plenum
Cargraphic catless or catted bypass pipe
BMC Filter
PWR Radiators
AMS Intercoolers
H&R VVT Springs & Coilovers
Tarett Monoball everything
Upgraded GT3 sway bars & drop links
DSC PASM controller
MSI Wheel Studs & Lug Nuts
15mm / 7mm wheel spacers
BGB 4-point harness bar (yellow)
Schroth enduro belts (black & yellow)
Porsche GT2 carbon fiber bucket seats
I'm sure I'm forgetting something but if you know anyone looking for a track oriented 991.2 GTS with 5-lugs, no sunroof and RAS delete, there might be a commission in it for you.
I have been interested in the H&R VVT kit and KW HAS kit.
Would you always recommend a sleeve kit over regular lowering springs if you plan on tracking the car? How much of a benefit are they over regular lowering springs? How important is the ability to corner balance the 991?
Thanks in advance.
09-09-2018, 10:18 PM
#248
These cars are difficult to dyno as they heat soak so fast, sitting on a dyno. It definitly pulls much stronger and is stock like silky smooth. I doubt it made an extra 100Hp, most certainly at least 50 Hp to the wheels.
So with a free flow cats and headers and AMS and stage 2 tune I think 100 HP should be very easily exceeded.
09-09-2018, 10:26 PM
#249
Instructor
No issues with COBB. No lights, and no errors. Its awesome. I think initially they had said that their GTS they dynoed made 509 HP with just Stage 1 COBB tune. A few members dynoed at 480 in hot conditions.
These cars are difficult to dyno as they heat soak so fast, sitting on a dyno. It definitly pulls much stronger and is stock like silky smooth. I doubt it made an extra 100Hp, most certainly at least 50 Hp to the wheels.
So with a free flow cats and headers and AMS and stage 2 tune I think 100 HP should be very easily exceeded.
These cars are difficult to dyno as they heat soak so fast, sitting on a dyno. It definitly pulls much stronger and is stock like silky smooth. I doubt it made an extra 100Hp, most certainly at least 50 Hp to the wheels.
So with a free flow cats and headers and AMS and stage 2 tune I think 100 HP should be very easily exceeded.
09-10-2018, 12:46 AM
#251
You can reflash yourself back to stock with the access port. A dealer would not tell unless something catastrophic happen and they went looking. Then they could tell. But if no issues and they are not looking, they won't tell.
09-10-2018, 02:23 AM
#252
BGB thanks for the candid response - I appreciate the comment re Porsche - their position in relation to Motorsport is interesting to strange sometimes. For example try and buy Cup car brakes and rotors ��
In in terms of suspension I think in terms of total achievable grip for a given set of tires - hence I look at sum g numbers in three directions eg left right and forward (braking). So for cup twos I should be able to achieve consistently sum g 5.1 - thus any changes must improve on that.
I'm spending more time doing Targa type events these day so I tend to prefer a supple set up that maximises contact patch contact with the road
If I was nearby I would very much enjoy exploring the limits of your car - it would be interesting to see the g sum numbers ��
In in terms of suspension I think in terms of total achievable grip for a given set of tires - hence I look at sum g numbers in three directions eg left right and forward (braking). So for cup twos I should be able to achieve consistently sum g 5.1 - thus any changes must improve on that.
I'm spending more time doing Targa type events these day so I tend to prefer a supple set up that maximises contact patch contact with the road
If I was nearby I would very much enjoy exploring the limits of your car - it would be interesting to see the g sum numbers ��
Last edited by groundhog; 09-10-2018 at 11:10 AM. Reason: typo
09-10-2018, 04:39 PM
#253
But COBB has to "crack" the computer first before you can upload their program so couldn't the dealer see this?
09-10-2018, 04:42 PM
#254
They took a lid off a jar and resealed it. No you cannot physically see this. When inside they retrieved a password and pressed it back together. If you had a back yarder take the lid off and bend it, you could physically see it, but COBB have a proper press that restores the lid perfectly. Nothing to see here folks.
09-10-2018, 06:15 PM
#255
best to find a tune friendly Porsche dealer and be upfront with them. Or if one deals Cobb then buy from them. Goes a long way in lower stress dealer service. Anything catastrophic Porsche will know it was tuned. No reason to hide the tune from the dealer. Once tuned the dice are rolled. Stage 1 from most reputable companies is benign. I love my Cobb.