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  • 93siro's Avatar
    Today, 02:41 AM
    As long as there is not a wide-spread standard for wheel horsepower, the crank horsepower is what that matters. When you say you have 560HP engine, you have 560HP. Everyone know what that is. But when you say you have a 560whp car, then there are several questions to be asked. What was the type of the dyno? What standard was chosen? What gear? Was it weather corrected etc.... I agree with the person who said why would you multiple the drivetrain loss to your dyno numbers? Its just stupid. The drivetrain loss goes up and down in higher and lower loads thats for sure, but it doesnt go up and down with a fixed rate.
    57 replies | 3406 view(s)
  • AdminTeam's Avatar
    Today, 02:37 AM
    Welcome TAYLOR, take a look around, I think you will like what you see.
    0 replies | 0 view(s)
  • AdminTeam's Avatar
    Today, 01:46 AM
    RondaKelle, we appreciate you taking the time to join.
    0 replies | 0 view(s)
  • Darkiedm4's Avatar
    Today, 01:33 AM
    Ok guys.... I know both of you are great. This seems just a slight misunderstanding ;) Erase and rewind!
    16 replies | 162 view(s)
  • Dietcoke's Avatar
    Today, 12:15 AM
    Newest revision 3" Catless VRSF downpipes (v2). We made a little extra clearance in two spots where it was a little tight to the subframe (you can see in the photo). No issues. Going back to stock. 220 shipped in the USA
    0 replies | 7 view(s)
  • Dietcoke's Avatar
    Today, 12:15 AM
    Dietcoke started a thread For Sale: Cobb AP V3 N54 Tuner in Buy/Sell - Parts
    Cobb V3 for N54, unmarried, still has the plastic cover over the tuner itself and original box, etc. Car going back to stock. $670 shipped firm, wont find a better deal around.
    0 replies | 10 view(s)
  • Nugs's Avatar
    Yesterday, 09:52 PM
    I was going to say this but saw he already did. I thought Donny had already been working on something like you describe (within the confines of his JB4 connect kit and app) for quite a long time.
    16 replies | 162 view(s)
  • alex@ABRhouston's Avatar
    Yesterday, 09:50 PM
    I'm fawkin going now! :D
    791 replies | 43191 view(s)
  • BlackJetE90OC's Avatar
    Yesterday, 09:50 PM
    Motor Trend has the same comparo coming shortly. Hopefully they took all three to the K&N dyno. I know they took the M3 during its first instrument test.
    6 replies | 352 view(s)
  • Sticky's Avatar
    Yesterday, 07:28 PM
    Sticky replied to a thread For Sale: UNUSED rebuilt Rbs in Buy/Sell - Parts
    closing
    15 replies | 546 view(s)
  • subaru335i's Avatar
    Yesterday, 06:47 PM
    We are clearly arguing completely different points. 1) A lot of modern turbo cars are under rated from the factory (crank horsepower). In extreme cases certain cars even show on the dyno almost as much whp as the factory rated crank horsepower. This has nothing to do with the next part. 2) Actual drivetrain losses from REAL crank horsepower output vs REAL whp output might be 20% at stock horsepower levels but not when the car has 2 or 3 times the stock power output. For example a stock 300 bhp car with 20% drivetrain losses will dyno 240 whp. The problem is when people mod this car to have lets say 800 whp on the dyno they incorrectly assume that they still have a 20% drivetrain loss and then they brag that the crank horsepower output must be 1000 bhp. In reality the engine is putting out maybe 920ish bhp depending on the specific car. Drivetrain losses will certainly go up with increased power output (meaning it is not a static loss of lets sat 60hp from the example) but it is not a linear 10% or 20% and any calculations based on the assumption that it is linear will be misleading and incorrect. I kind of like this explanation: http://www.superstreetonline.com/how-to/engine/modp-1005-drivetrain-power-loss/ With a good conclusion: "So rather than attempting to convert your vehicle's dyno-measured wheel horsepower to a SAE net horsepower figure using a percentage or a fixed horsepower value, you're far better off accepting the fact that these two types of horsepower measurements aren't easily correlated and forego any attempt at doing so."
    57 replies | 3406 view(s)
  • ChuckD05's Avatar
    Yesterday, 06:39 PM
    ChuckD05 replied to a thread For Sale: UNUSED rebuilt Rbs in Buy/Sell - Parts
    wow i grossly under charged on my set! congrats on the sale...
    15 replies | 546 view(s)
  • COBB Tuning's Avatar
    Yesterday, 06:36 PM
    Back from Pikes Peak and we just wanted to post up some of the info from the blog. This is a bit of data that we have collected over some the past few months. This same data is what we put into our calibrations to make sure they work no matter the variable! Here is some info from the blog I figured I would post up so you guys can check it out! READING/WRITING OF THE ECU How long does it take? The initial install of the Accessport takes around 6 minutes. Once installed, a map change takes approximately 1 minute. Map changing is done on the Accessport and you can select from calibrations that come preloaded on the device. We have Stage1 maps that are for otherwise stock cars as well as Stage2 maps that are made for cars with upgraded exhaust systems. These calibrations come for ACN91, 91, 93, and 100 octane fuels. We do require that a battery charger be connected to the car for the initial Accessport install process on the 991 turbo. Once installed, a battery charger is not required for map changes. DATALOGGING A great deal of time and resources have been invested to make sure we are offering an exceptional, feature rich, tuning tool. One that can not only flash but also allow the end user to monitor the health and status of their car; something that only the COBB Accessport can do! Data collection is an instrumental part of making a proper calibration. Without data you are only taking an educated guess of the vehicle’s state. The Accessport is able to datalog the most crucial parameters for the Engine Control Unit at a sample rate of 45 samples per second. We currently have the ability to log every single factory monitor as well as a slew of custom created monitors that not even Porsche can see! As we continue to learn more about these cars, we will have the ability to create custom monitors using any data that is reported to, or calculated by, the ECU. Below is an example of a small sample of data monitors we currently have access to, viewed in conjunction with a dyno run from one of the many 991 turbos we have been testing with: Over the previous months we have flown around the country and tested our OTS maps for these cars in varying climates and elevations using a variety of fuel grades. A majority of the R&D was performed out of our COBB SoCal facility which has access to some very poor quality 91 octane fuels as well as 100 octane race fuel. We have also performed a great deal of testing in extreme climates and elevations. From a freezing Pikes Peak to an extremely hot and humid Puerto Rico, we were able to test the cars and calibration files in a variety of relative air densities. Below, we’ll take a look at a few of the quirks we’ve learned along the way: -First, the factory intercoolers leave much to be desired even in stock form. With raised boost pressure we have seen intake temps as high as 185*F while in Puerto Rico and 205*F on Pike Peak pushing the pressure ratio of turbos in an extremely low barometric pressure environment. Intercoolers will be a highly recommended upgrade for these cars in the future as cooling the intake charge will be absolutely vital for making power in a safe manner. -The fuel system on the 991 Turbo seems to be a bit more capable than that of the previous 997.2 Turbo. We have experimented with alternative fuel mixtures and thus far have had great results. We have successfully tested up to E30 in a Stage2 Turbo S without any issues whereas the direct injection fuel system on the 997.2 Turbo car is not capable of maintaining pressure with that amount of ethanol content. We will continue to experiment with alternative fuel blends in order to find and push the limitations of the factory fuel system. -The turbochargers on the 991 Turbo appear to be more efficient than those of the previous generations. We performed some exhaust gas back pressure testing in the 991 and compared the results to those from a 991.1 Turbo. We noticed that the 991 spools earlier as well as holds boost longer with less back-pressure. Back-pressure is still quite high in the upper RPM range but not as bad as the 997.1. Below is a dyno plot illustrating the differences between the 991 and 997.1: The solid line is from the 997.1 and the dashed is from the 991. The blue line is the barometric pressure (InHg), pink is temperature (*F), red is relative boost pressure (psig), and orange shows exhaust manifold pressure (psig). You can see that the 991 spools quicker and makes more boost with less back pressure than with the 997.1. The average boost from 2200RPM to 6500RPM on the 991 in this example was 19.4psi with and average exhaust gas back pressure of 24.2psi. The average boost for the 997.1 over the same rev range was 17.3psi with an average exhaust back pressure of 24.182psi. At 6500RPM the exhaust back pressure of the 991 is just shy of 10psi lower than that of the 997.2. In general, it is preferred to keep exhaust gas back pressure at a minimum in order to keep temperatures under control. When exhaust gas back pressure is too high it puts excessive strain on the turbocharger and effectively lowers the overall volumetric efficiency of the engine. POWER GAINS The 991 Turbo’s gains on the OTS (Off The Shelf) maps are substantial. This is a graph of a bone stock 2015 991 Turbo S with just a flash. As you can see the car picks up a lot all over the power band! Another strong example of a car we have tuned with some basic bolt-on modifications: This is a graph of a bone stock 2015 991 Turbo S with just a flash. As you can see the car picks up a lot all over the power band! Another strong example of a car we have tuned with some basic bolt-on modifications: If you have any questions on the 991 stuff please feel free to email me and ask! mitch.mckee@cobbtuning.com Thanks! -Mitch
    1 replies | 140 view(s)
  • AdminTeam's Avatar
    Yesterday, 06:30 PM
    Welcome to a real enthusiast forum LarryLeak1.
    0 replies | 9 view(s)
  • Modded335i's Avatar
    Yesterday, 06:25 PM
    Modded335i replied to a thread For Sale: UNUSED rebuilt Rbs in Buy/Sell - Parts
    Sold
    15 replies | 546 view(s)
  • Sticky's Avatar
    6 replies | 352 view(s)
  • Ofmalik's Avatar
    16 replies | 162 view(s)
  • dmacpro91's Avatar
    Yesterday, 05:23 PM
    I've been emailing you. I'm sending you my response now.
    16 replies | 162 view(s)
  • Sticky's Avatar
    Yesterday, 05:23 PM
    If you want to work things out amicably I'm open to it but I'm not going to stand by as my ideas and projects are stolen by others. That flash backstabbing was enough.
    16 replies | 162 view(s)
  • dmacpro91's Avatar
    Yesterday, 05:21 PM
    Yes, forgot. I have a lot of my own projects on my plate that going a month without hearing anything tends to lead me to forget about it.
    16 replies | 162 view(s)
  • Sticky's Avatar
    Yesterday, 05:21 PM
    No you didn't. You looked at the project, participated in it, asked for a % of money LIFETIME (seriously?), and were just updated on it last month. It's clear what you are doing. You didn't bother to ask, check, or anything. I told you the hardware is being assembled right now and there is nothing for you to do. What more was I supposed to do? Send weekly telegrams?
    16 replies | 162 view(s)
  • Sticky's Avatar
    Yesterday, 05:20 PM
    What post is that? From an ex-vendor who has no idea what is going on and is upset I outed them for not paying their tab so they jump in with garbage? Guest vendors don't have that privilege, sorry. Go ahead and re-post the one line insult if you want. Added a lot to the discussion and was on topic, right? That is exactly what you are doing and I have all the details in writing. I did update you LAST MONTH. Just conveniently forgot that quickly eh?
    16 replies | 162 view(s)
  • AdminTeam's Avatar
    Yesterday, 05:17 PM
    Welcome squixs, take a look around, I think you will like what you see.
    0 replies | 6 view(s)
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