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A Closer Look at the OEM CLA250 Turbo

This is a discussion on A Closer Look at the OEM CLA250 Turbo within the CLA Performance forums, part of the Mercedes-Benz CLA Forum category; Originally Posted by Santy35 Any thoughts on what the stock engine can handle ? Upgrading the turbo, intakes, tunes, downpipes, do you guys feel that ...

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Thread: A Closer Look at the OEM CLA250 Turbo

  1. #21
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    Quote Originally Posted by Santy35 View Post
    Any thoughts on what the stock engine can handle ? Upgrading the turbo, intakes, tunes, downpipes, do you guys feel that the engine will be able to hold up to the power increases? I only ask since this seems to be of high debate in the forum as of recently and I figured a professional opinion would be super appreciated by allot of people
    Unfortunately, there is no way to know exactly until one fails. However our design team works very hard to design easy to bolt on parts that give more power without adding additional stress. For instance, making more power at the same boost, or moving the power band around for a faster drive without beating up the motor, etc. Also, we test everything we do on our company CLA250 project car so that if we do reach any limits, we do it on our own car first.
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    Are you talking about increasing the boost from the already high 14.5 psi? With cast pistons, cast rods, cast crank, an already high compression ratio, Increasing heat, etc?

    Anybody can make these engines more powerful. The trick is to make it more powerful and preserve the longevity.

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    Quote Originally Posted by 07SGT View Post
    Are you talking about increasing the boost from the already high 14.5 psi? With cast pistons, cast rods, cast crank, an already high compression ratio, Increasing heat, etc?

    Anybody can make these engines more powerful. The trick is to make it more powerful and preserve the longevity.
    We're seeing 20-21 PSI with the Carlsson C-Tronic on the stock turbo and our turbo upgrade without any adverse effects. GDi is a different beast, it all but eliminates detonation and pre-ignition, which is the killer. If you can maintain control over the combustion event, there is much less of a risk. Realistically, you are pushing the motor to limits over what it was designed for; and when you do this, there is ALWAYS a risk. If you don't have that sort of risk tolerance, your best bet is to leave the car stock.

    In regards to our turbo upgrade, where it really shines is above 4500RPMs where the stock wheel runs out of flow; our billet wheel upgrade keeps pulling all the way to redline. Not that is doesn't make more peak torque, because it does, but we're seeing gains close to 60 WHP (yes 60 to the wheels!) above 4500 all without running more peak boost than the stock turbo!
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    Quote Originally Posted by TurboKits.com View Post
    We're seeing 20-21 PSI with the Carlsson C-Tronic on the stock turbo and our turbo upgrade without any adverse effects. GDi is a different beast, it all but eliminates detonation and pre-ignition, which is the killer. If you can maintain control over the combustion event, there is much less of a risk. Realistically, you are pushing the motor to limits over what it was designed for; and when you do this, there is ALWAYS a risk. If you don't have that sort of risk tolerance, your best bet is to leave the car stock.

    In regards to our turbo upgrade, where it really shines is above 4500RPMs where the stock wheel runs out of flow; our billet wheel upgrade keeps pulling all the way to redline. Not that is doesn't make more peak torque, because it does, but we're seeing gains close to 60 WHP (yes 60 to the wheels!) above 4500 all without running more peak boost than the stock turbo!
    Is the 60 WHP gain with the turbo upgrade alone or in tandem with Carlsson?

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    More HP/TQ is always better. And I concur with you that there is always a risk and if you don't have that tolerance for risk you are better to leave the engine stock. But you need more than a tolerance for risk. You need an American Express card or a second mortgage equity line if something goes wrong as it would probably be a minimum of a 10,000.00 re-build, if not much more. And yes, it is usually pre-detonation which is the killer and which is induced, including but not limited to, octane, heat, compression, quality of gasoline, timing, etc. And as you stated you are pushing the motor over what it was designed for. That says it all. IMO, and the opinion of the lead mechanic at my dealership, he stated the CLA 250 is right about its limit at stock and would not recommend any enhancements. Again, anybody can add HP/TQ, doing so and keeping longevity is usually not compatible. [/I][/B] [/U][/I][/B]
    Last edited by 07SGT; 06-12-2015 at 03:18 PM.

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    Mechanic at dealership. That's all you needed to say. They'll tow the company line.
    2015 C63S - Rebellion Tuned
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    The lead mechanic at my local dealership said a car's A/C will not blow cold air when it's hot outside.

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    This was an off the record conversation with a mechanic that used to build and race Corvettes. Yes, I am sure the mechanic will tow the company line as do the manufacturers of after-market kits to increase performance. It is the job of the after market performance companies to sell us products, even if they do exceed design specs for what the motor was designed for. If Mercedes offered an enhancement, with warranty, I would be one of the first to buy. But don't expect the after market company to pay for an engine after a catastrophic failure. Again, I am sure that will be North of 10,000.00. Probably way North! But like Turbo said, if you have the tolerance for risk go for it. It would probably have been cheaper just to have bought the AMG in the first place. Or as the old German adage, we grow old too soon, and wise too late. The above is just my opinion, but it is based on history.

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    Quote Originally Posted by Picard View Post
    Is the 60 WHP gain with the turbo upgrade alone or in tandem with Carlsson?
    In tandem with the Carlsson C-Tronic Tuner. Thanks.
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    Quote Originally Posted by TurboKits.com View Post
    We're seeing 20-21 PSI with the Carlsson C-Tronic on the stock turbo and our turbo upgrade without any adverse effects. GDi is a different beast, it all but eliminates detonation and pre-ignition, which is the killer. If you can maintain control over the combustion event, there is much less of a risk. Realistically, you are pushing the motor to limits over what it was designed for; and when you do this, there is ALWAYS a risk. If you don't have that sort of risk tolerance, your best bet is to leave the car stock.

    In regards to our turbo upgrade, where it really shines is above 4500RPMs where the stock wheel runs out of flow; our billet wheel upgrade keeps pulling all the way to redline. Not that is doesn't make more peak torque, because it does, but we're seeing gains close to 60 WHP (yes 60 to the wheels!) above 4500 all without running more peak boost than the stock turbo!
    Those are some amazing results and great things to hear. I will definitely be interested in an upgrade when it is production ready!
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