991.2 COBB tune - Impressions and Dyno
#121
#122
Racer
Thread Starter
A radiator is for engine cooling. The engine temperature is regulated by coolant pumped through it. The radiator is a heat exchanger. It uses engine coolant pumped through the metal fin assembly to exchange heat with the air passing though the radiator. The cooled fluid then is pumped through the engine removing and regulating more heat. Its a cyclical system.
An intercooler operates on a similar principle, but it is used to cool the intake air temperatures. As the turbo compresses air, it heats up. The IC passes hot compressed air from the turbo through a fin matrix to exchange heat with the air passing through it. Its used to cool the intake charge before combustion. Cooler air intake temperatures, denser charge, equals more power. (There are coolant based intercooler systems, but thats not applicable on our cars.)
Theres obviously a lot of other considerations and implications, but thats the simple definition and difference.
#123
intercooler cools the air that passed through the turbo ( and got heated up) and then goes into the engine to be combined with gas and burned.
If this air is not cooled, it is not as dense and less of it can be forced into the engine ( reducing power).
#124
You would think they would a variant of the radiator assembly that would work with ACC.
A radiator is for engine cooling. The engine temperature is regulated by coolant pumped through it. The radiator is a heat exchanger. It uses engine coolant pumped through the metal fin assembly to exchange heat with the air passing though the radiator.
An intercooler operates on a similar principle, but it is used to cool the intake air temperatures. As the turbo compresses air, it heats it. The IC passes hot compressed air from the turbo through a fin matrix to exchange heat with the air passing through it.
Liquid to air vs. air to air
A radiator is for engine cooling. The engine temperature is regulated by coolant pumped through it. The radiator is a heat exchanger. It uses engine coolant pumped through the metal fin assembly to exchange heat with the air passing though the radiator.
An intercooler operates on a similar principle, but it is used to cool the intake air temperatures. As the turbo compresses air, it heats it. The IC passes hot compressed air from the turbo through a fin matrix to exchange heat with the air passing through it.
Liquid to air vs. air to air
i have a new 911 coming Nov 2. I’m trying to decide what is most important to add.
its a 4S with the powerkit. Tune, exhaust system and inter cool seems like the big gains.
#125
Instructor
Yes It does but when you tune the engine, and increase boost, more heat is generated (more compression equals more heat- laws of thermodynamics) than the stock intercoolers were designed to cope with. Sometimes the stock intercoolers would be OK over short spurts (or in colder climates) but perhaps not long-term in a track environment (or hotter climates). Aftermarket intercoolers which are usually larger are often used on tuned cars.
#126
Well my Cobb box got to dealer fast and shipped out to back them with DME already . Hope to get my base model back early next week with Cobbed DME. Really excited after reading some of the posts here! Glad I put lots of miles on quickly so will know and hopefully appreciate the difference.
Will the power and torque be more comparable to a stock 991.2 GTS level ?
Will the power and torque be more comparable to a stock 991.2 GTS level ?
#127
Rennlist Member
Hey guys....
I'm really considering a manual, base 991.2. Ideally/eventually I'd like to upgrade it to the X51 (GTS) turbos and a cobb tune, but wondering how it might do short term with the base turbos, sport exhaust, and Cobb tune.
I currently have a 996 Turbo, stock but for a stage 1 Cobb tune, and just don't want a replacement to feel painfully slow.
Cobb says the 991.2 stage 1 tune on a non-S base (49mm turbos) is about 435 HP to the wheels and 460 TQ... Never had my 996 on a dyno, but that seems like it is probably not too far off my to-the-wheels horsepower.
I know i'd be thrilled once fully upgraded, but does anyone have some seat time on a lowly base with the Cobb stage 1 tune?
I'm really considering a manual, base 991.2. Ideally/eventually I'd like to upgrade it to the X51 (GTS) turbos and a cobb tune, but wondering how it might do short term with the base turbos, sport exhaust, and Cobb tune.
I currently have a 996 Turbo, stock but for a stage 1 Cobb tune, and just don't want a replacement to feel painfully slow.
Cobb says the 991.2 stage 1 tune on a non-S base (49mm turbos) is about 435 HP to the wheels and 460 TQ... Never had my 996 on a dyno, but that seems like it is probably not too far off my to-the-wheels horsepower.
I know i'd be thrilled once fully upgraded, but does anyone have some seat time on a lowly base with the Cobb stage 1 tune?
#128
Racer
Thread Starter
Well my Cobb box got to dealer fast and shipped out to back them with DME already . Hope to get my base model back early next week with Cobbed DME. Really excited after reading some of the posts here! Glad I put lots of miles on quickly so will know and hopefully appreciate the difference.
Will the power and torque be more comparable to a stock 991.2 GTS level ?
Will the power and torque be more comparable to a stock 991.2 GTS level ?
Hey guys....
I'm really considering a manual, base 991.2. Ideally/eventually I'd like to upgrade it to the X51 (GTS) turbos and a cobb tune, but wondering how it might do short term with the base turbos, sport exhaust, and Cobb tune.
I currently have a 996 Turbo, stock but for a stage 1 Cobb tune, and just don't want a replacement to feel painfully slow.
Cobb says the 991.2 stage 1 tune on a non-S base (49mm turbos) is about 435 HP to the wheels and 460 TQ... Never had my 996 on a dyno, but that seems like it is probably not too far off my to-the-wheels horsepower.
I know i'd be thrilled once fully upgraded, but does anyone have some seat time on a lowly base with the Cobb stage 1 tune?
I'm really considering a manual, base 991.2. Ideally/eventually I'd like to upgrade it to the X51 (GTS) turbos and a cobb tune, but wondering how it might do short term with the base turbos, sport exhaust, and Cobb tune.
I currently have a 996 Turbo, stock but for a stage 1 Cobb tune, and just don't want a replacement to feel painfully slow.
Cobb says the 991.2 stage 1 tune on a non-S base (49mm turbos) is about 435 HP to the wheels and 460 TQ... Never had my 996 on a dyno, but that seems like it is probably not too far off my to-the-wheels horsepower.
I know i'd be thrilled once fully upgraded, but does anyone have some seat time on a lowly base with the Cobb stage 1 tune?
Your tuned COBB Base 991.2 is at least as fast as your 996 turbo. Don't forget you can add cat bypass pipes or sport cats, upgraded IC's, turbo's etc.
Honestly, IMO, the base C4 is the way to go if your planning on doing bolt ons and tuning. You get the wide body, awd, and then you drop turbos, IC's, all additional bolt ons and your at 600awhp for around 10-12k.
Last edited by ///M3THOD; 07-19-2018 at 09:25 PM. Reason: Corrected
#129
Instructor
Not sure this is accurate. The GTS turbos bolt right up to the base car. Only the inside turbine wheel diameter changes between the base,S,and GTS models. Now, the dealer may not sell us the GTS turbos, but they do fit. I presume then a Cobb tune would be needed to make them work to capacity.
#130
Racer
Thread Starter
Not sure this is accurate. The GTS turbos bolt right up to the base car. Only the inside turbine wheel diameter changes between the base,S,and GTS models. Now, the dealer may not sell us the GTS turbos, but they do fit. I presume then a Cobb tune would be needed to make them work to capacity.
You could bolt them onto the Base car, but at that point your just buying a turbo upgrade. Why not buy an aftermarket option like the TiAL turbo system thats just coming to market. Far more potential for a lower price.
#131
Burning Brakes
Not sure this is accurate. The GTS turbos bolt right up to the base car. Only the inside turbine wheel diameter changes between the base,S,and GTS models. Now, the dealer may not sell us the GTS turbos, but they do fit. I presume then a Cobb tune would be needed to make them work to capacity.
Base 49/45mm
S 51/45 mm
GTS 55/48mm
#132
Rennlist Member
You're essentially paying the extra money for the warranty that you cannot use You could bolt them onto the Base car, but at that point your just buying a turbo upgrade.
With Suncoast pricing of only $5,800 for the X51 kit, seems like throwing away the license (and any associated warranty retention) is kind of non issues. For me, the big advantage is that all the development work and maps for other GTS/X51 cars would be plug-and-play for my car without having to spend lots of dyno time dialing it in... This thread being a *perfect* example!
Why not buy an aftermarket option like the TiAL turbo system thats just coming to market. Far more potential for a lower price.
#133
Burning Brakes
#134
Rennlist Member
yup, aware of this limitation. I'm paying for a "software license" that I will not be able to use, and would be 100% dependent on Cobb (or other) tunes to make it run right.
With Suncoast pricing of only $5,800 for the X51 kit, seems like throwing away the license (and any associated warranty retention) is kind of non issues. For me, the big advantage is that all the development work and maps for other GTS/X51 cars would be plug-and-play for my car without having to spend lots of dyno time dialing it in... This thread being a *perfect* example!
I like that idea as well and should look into it further, but I'm guessing there is no way I'm getting a pair of bolt-on TiAL's for less than $5,800, even without the additional tuning expenses?
With Suncoast pricing of only $5,800 for the X51 kit, seems like throwing away the license (and any associated warranty retention) is kind of non issues. For me, the big advantage is that all the development work and maps for other GTS/X51 cars would be plug-and-play for my car without having to spend lots of dyno time dialing it in... This thread being a *perfect* example!
I like that idea as well and should look into it further, but I'm guessing there is no way I'm getting a pair of bolt-on TiAL's for less than $5,800, even without the additional tuning expenses?
Also, Cobb tuned one of the TiAL turbo 991.2's so maybe there will be a canned tune available for those turbos at some point?
#135
Oh Hey Sticky. What's up? What is the current US1/4 mile trap record, and for what? 991.2?