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Time to try the TJet conversion.
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Thread: Time to try the TJet conversion.

  1. #1
    Boost Addict Lifetime Member opiateESP's Avatar
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    Time to try the TJet conversion.

    So I really despise MultiAir after all these years with it and I'm lusting after the simplicity of DOHC. This is more or less an attempt to save the built engine as MultiAir just doesn't want to open regardless of what we do. I'm not buying another brick. My car is a 124 but this completely applies to the Abarth 500 and if this works out, this engine will be eventually relocated into a 500. I am using parts from a European spec 2018 Abarth 500 to complete this.

    I postulated this would be doable 6 years ago so I've put my $$$ down and have all the parts on their way here from the UK and Ireland.

    E2CACC4F-5C43-4B63-B5A2-AB1D8D71AE52.jpg3.jpg

    So just how plausible is this? More so than I ever expected it to be. The 1.4 cylinder head is a 2 part affair. It has an upper and lower section. The lower contains the ports that the manifolds connect to and the valves. The upper carrier holds MultiAir and the exhaust camshaft. The lower section of the head and down are completely identical - part for part - between the TJet and the MultiAir. So essentially; remove the Multiair upper, install the TJet upper.

    (In this photo, you can see where the two portions of the cylinder head meet.)
    A5C8C6E4-37F1-454E-A840-886AA7A5AB70.jpg

    It gets easier.

    The cam sensor, timing belt, tensioner are all the same. The DOHC head runs off a single cam the uses two internal gears to sync the cams.

    IMG_1848.jpg

    That little port you may have plugged your BOV into on the manifold? Well that's what replaces the big vacuum pump that sits under the big black PCV box. That part just simply goes away Speaking of the black box, a simple catch can will replace that.

    Timing it looks to be super simple. It's a special kit as well. It is mostly the same as the Multiair kit but has a different tool set for setting cam timing. John@Tork believes he should be able to tune the ECU to run the engine by turning off "Multiair Equipped"

    IMG_1849.jpg

    I'll update once the parts show up.
    Last edited by opiateESP; 09-06-2019 at 01:30 PM.
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  2. The Following 3 Users Say Thank You to opiateESP For This Useful Post:

    doverosx (09-06-2019), flyboy2160 (10-10-2019), Neon.Ghoul (10-09-2019)

  3. #2
    Lifetime Member Lifetime Member Saponetta's Avatar
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    Hahahahah yes!


    I know your dealing with a built motor, so it makes sense to convert.

    How much did all the components run you? Tjet are cheap little motors.




    I know john likes those marelli ecu, so very curious to see how this goes down. The mechanical is easy. I want to see how yiu guys run it.



    YES. This is all I think about everytime I look at my car.

    For real.though, the conversion doesnt even look to require removing the lower head casting. Wow. The mechanical part looks like an afternoon job. The timing belt would take the longest probably.


    I'd the t jet only variable intake cam? What's the story on variable valve and cam.phasing?

    John is so talented, im.exoted.to see where this goes. I see this becoming a first mod.for anyone who wants to go beyond a mostly stock car and a tune.
    Last edited by Saponetta; 09-06-2019 at 01:50 PM.
    2013 abarth
    Spec 2+ clutch
    Working on new divided turbo setup
    Homebrew fmic w/ corsa forza hoses
    Stock Downpipe with cat and 2.25discharge
    Coils
    Homemade cowl intake
    ECB yellows/stop tech fluid
    Koni/vogtland
    Braces and strut mounts
    Corsa forza vento
    E30 blend

    2013 abarth tork tuned
    cowl intake, custom fmic and bypass valve, vogtlands, rear vette bilstiens, long 3 inch downpipe to stock rear section.

  4. #3
    Boost Addict Lifetime Member opiateESP's Avatar
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    Quote Originally Posted by Saponetta View Post
    Hahahahah yes!


    I know your dealing with a built motor, so it makes sense to do a conversion. But for most, I would say just buy a complete tjet. They are dirty dirty cheap little whores.

    You gonna run aftermarket efi now? There is stiff thats speaks flat makes sense. Trying to use factory harnesses and ecm for this epuld be a nightmare.....



    YES. This is all I think about everytime I look at my car.
    That's horrible advice. Don't buy a whole TJet engine at all. It's way cheaper and easier to just swap that one part.

    As I said in the original post, using the OEM ECU looks to be easy.
    Pistons & Petrol: Follow us on YouTube.

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  5. #4
    Lifetime Member Lifetime Member Saponetta's Avatar
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    How.much for that tight edm oil filler cap???
    2013 abarth
    Spec 2+ clutch
    Working on new divided turbo setup
    Homebrew fmic w/ corsa forza hoses
    Stock Downpipe with cat and 2.25discharge
    Coils
    Homemade cowl intake
    ECB yellows/stop tech fluid
    Koni/vogtland
    Braces and strut mounts
    Corsa forza vento
    E30 blend

    2013 abarth tork tuned
    cowl intake, custom fmic and bypass valve, vogtlands, rear vette bilstiens, long 3 inch downpipe to stock rear section.

  6. #5
    Boost Addict Lifetime Member opiateESP's Avatar
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    Quote Originally Posted by Saponetta View Post
    How.much for that tight edm oil filler cap???
    Give me an address. It's yours.
    Pistons & Petrol: Follow us on YouTube.

    2017 Abarth 124 Spider
    Tork Tuned | CP Pistons | Carrillo Rods | Garrett G25-550

    The 300+ Club(?)
    #notscare

  7. #6
    Lifetime Member Lifetime Member Saponetta's Avatar
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    Quote Originally Posted by opiateESP View Post
    That's horrible advice. Don't buy a whole TJet engine at all. It's way cheaper and easier to just swap that one part.

    As I said in the original post, using the OEM ECU looks to be easy.
    Yea I read thru the whole thing. AMD looked at all pics. Was so exited I jumped the gun. It looks like an afternoon job. Your not even lifting the head off the block. It looks like zero conversion to timing system too. Couldnt be simpler really. Bolt on twin cam.

    It looks like the t jet has no variable vam at all. Is it even variable valve timing?
    Last edited by Saponetta; 09-06-2019 at 01:59 PM.
    2013 abarth
    Spec 2+ clutch
    Working on new divided turbo setup
    Homebrew fmic w/ corsa forza hoses
    Stock Downpipe with cat and 2.25discharge
    Coils
    Homemade cowl intake
    ECB yellows/stop tech fluid
    Koni/vogtland
    Braces and strut mounts
    Corsa forza vento
    E30 blend

    2013 abarth tork tuned
    cowl intake, custom fmic and bypass valve, vogtlands, rear vette bilstiens, long 3 inch downpipe to stock rear section.

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    opiateESP (09-06-2019)

  9. #7
    Boost Addict Lifetime Member opiateESP's Avatar
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    Quote Originally Posted by Saponetta View Post
    Yea I read thru the whole thing. It looks like an afternoon job. Your not even lifting the head off the block.

    It looks like the t jet has no variable vam at all. Is it even variable valve timing?
    That I do not know. I'm still learning about it. There is a mechanism beside the cam gear that may play some role but ultimately I have to say "I don't know" at this point. What I do know, is there's a bunch of cam options out there to play with and I'll be able to hit whatever number I'm willing to pay for using that upper. There's years of history to demonstrate what a TJet can do.
    Pistons & Petrol: Follow us on YouTube.

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  10. #8
    Lifetime Member Lifetime Member Saponetta's Avatar
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    Os the upper casting AMD valvetrain/cams commonly sold together? Is this the only partsrequired? Can you email me a complete parts list? I'm out of town right now, bit would like to start this on my spare motor as soon as I get home. Cant wait to see if the factory ecu runs this.



    I never seriously looked at the physical aspect of a tjet motor as running one on a street registered and emissions tested car didnt seem practical.

    THANK GOD John has cracked this ecu to the extent he has. No one in america at least would have had any clue multiair control was just a base configuration setting. I wonder if intake cam control is just as simple? Absolutly makes sense they would design muktiair and tjet engine controls to be completly physically interchangeable with a ecm programming itself being the only difference.

    I'm pumped.to see what john comes up with for controlling this. Even a locked intake cam is still preferable to multiair for max power.
    Last edited by Saponetta; 09-06-2019 at 02:22 PM.
    2013 abarth
    Spec 2+ clutch
    Working on new divided turbo setup
    Homebrew fmic w/ corsa forza hoses
    Stock Downpipe with cat and 2.25discharge
    Coils
    Homemade cowl intake
    ECB yellows/stop tech fluid
    Koni/vogtland
    Braces and strut mounts
    Corsa forza vento
    E30 blend

    2013 abarth tork tuned
    cowl intake, custom fmic and bypass valve, vogtlands, rear vette bilstiens, long 3 inch downpipe to stock rear section.

  11. #9
    Lifetime Member Lifetime Member Saponetta's Avatar
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    Yea its just gonna be cash outlay for you now. AMD miata driveline makes it a lot easier and cheaper for you.

    Abarth still gonna have a very expensive trip to north of 250hp. But at least now the engine will be be able to do it with correct head prep.
    Last edited by Saponetta; 09-06-2019 at 02:17 PM.
    2013 abarth
    Spec 2+ clutch
    Working on new divided turbo setup
    Homebrew fmic w/ corsa forza hoses
    Stock Downpipe with cat and 2.25discharge
    Coils
    Homemade cowl intake
    ECB yellows/stop tech fluid
    Koni/vogtland
    Braces and strut mounts
    Corsa forza vento
    E30 blend

    2013 abarth tork tuned
    cowl intake, custom fmic and bypass valve, vogtlands, rear vette bilstiens, long 3 inch downpipe to stock rear section.

  12. #10
    Boost Addict Lifetime Member opiateESP's Avatar
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    Quote Originally Posted by Saponetta View Post
    Yea its just gonna be cash outlay for you now. AMD miata driveline makes it a lot easier and cheaper for you.

    Abarth still gonna have a very expensive trip to north of 250hp. But at least now the engine will be be able to do it with correct head prep.
    That all has to be done anyways so I'm not concerned with the 124. I have a whole other plan for the 500 but that's for another time.
    Pistons & Petrol: Follow us on YouTube.

    2017 Abarth 124 Spider
    Tork Tuned | CP Pistons | Carrillo Rods | Garrett G25-550

    The 300+ Club(?)
    #notscare

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