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Power limit of 1.4 non turbo multi air
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Thread: Power limit of 1.4 non turbo multi air

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    Power limit of 1.4 non turbo multi air

    Just wondering if anyone has really pushed one of these multi air engines and found the limit ish. I am thinking of trying to build one I am not looking for crazy power, but want a bit more than what I got.

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    What are you thinking about doing to bump up the HP? There are things you can do that will give you a boost, but just keep in mind if you want a really substantial increase in power it will cost you $$$ and you then cross into the range of buying a 500T or Abarth. That kind of limits your options for big power in the NA MultiAir, but as long as you are fine with it, go for it. All 500s are fun to tweak!
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    It's a very old rule but I think it still applies - generally, reliability takes a huge hit around the 2hp per cubic inch area in naturally aspirated cars. A 1.4L Fiat is ~84 cubic inches so pushing it to 160hp would be its upper limit. Getting 160hp would cost quite a lot of money and the power band would be very 'peaky' so a turbo is a better idea.

    Someone will comeback about motorcycles making big power yet being very reliable but they are also only pushing around ~450 lbs so it isn't quite an apples-to-apples comparison.
    2014 Abarth, Rosso/Nero, basically stock w/a few trinkets.

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    I not looking for a ton more power, but I would like to get just a bit more grunt. I know I could switch to a 500 or abarth, but I don't want a turbo cause I wanna keep the response of the n/a motor. I plan to use it for autocross. So response and torque are what I am trying to get.

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    Senior Member aelfwyne's Avatar
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    Quote Originally Posted by LittleSkittle12 View Post
    I not looking for a ton more power, but I would like to get just a bit more grunt. I know I could switch to a 500 or abarth, but I don't want a turbo cause I wanna keep the response of the n/a motor. I plan to use it for autocross. So response and torque are what I am trying to get.
    If you have a 2012 or 2013, you can get a Eurodrive tuner for the base NA 500 for $585. That will give you 13 hp and 14 Tq. Add to that an intake and open exhaust and you MIGHT eek out 18 or more bhp TOTAL over stock. That's not significant, but it's enough to feel. Throttle enhancement is included in that package, for better response.

    If you have a 2014 or 2015 the tuner isn't available yet - same issue as newer Abarths.... don't bother. Really. Seriously. RoadRace will sell you a "timing controller" for way too much money. I had one. I couldn't feel a thing when it was installed. It's basically the eBay resister hack that should cost about $1.20 but they charge hundreds for it. It lies to the ECU about the intake temperature reading, to trick the ECU into giving additional timing. Generally the ECU will over time tune that back out. Actual increase is negligible. You can still do intake+exhaust but don't expect any kind of real increase other than just a better sound.

    Your best bet with a 2014/2015 is just a Go Pedal for sharper response, then you do Driver Mod.

    Trust me on this. I bought a 500 Sport, modded the hell out of it, and then traded for an Abarth.

    Quote Originally Posted by JimmyTestarossa View Post
    It's a very old rule but I think it still applies - generally, reliability takes a huge hit around the 2hp per cubic inch area in naturally aspirated cars. A 1.4L Fiat is ~84 cubic inches so pushing it to 160hp would be its upper limit. Getting 160hp would cost quite a lot of money and the power band would be very 'peaky' so a turbo is a better idea.

    Someone will comeback about motorcycles making big power yet being very reliable but they are also only pushing around ~450 lbs so it isn't quite an apples-to-apples comparison.
    I doubt that's even possible with the NA 1.4 multiair. You'd have to get rid of the multiair block and ECU control, replace it with a hot exhaust cam, replace the intake cam, port the head, use a custom ECU, probably work the crank over, and basically do everything nobody's been able to do before with the full resources of an engine fabrication expert at your disposal - and you're still just dealing with 1.4 liters.
    Last edited by aelfwyne; 05-10-2016 at 10:07 PM.
    2015 Rosso Abarth - MAD FIAT - 5 Speed - Phase 2
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    Senior Member Trunkout's Avatar
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    Whoa... The RRM controller is just a resistor? Better tell Leno!
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    SOLD August 2018 BUT got company car

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    Senior Member aelfwyne's Avatar
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    Quote Originally Posted by Trunkout View Post
    Whoa... The RRM controller is just a resistor? Better tell Leno!
    I'm talking about the RRM Timing Controller for the naturally aspirated Fiat 500. Not the RRM Ultimate for Turbo/Abarth. The RRM Ultimate is much more sophisticated. But not for the NA engine.

    The resister trick that's famous on ebay is to trick the intake temperature sensor circuit into thinking the engine is cold when it isn't.

    I did datalogging on my 500 Sport when I had the RRM Timing Controller. Guess what it did? Turned 80 degree ambient temperature into a 50 degree intake air temp.

    Maybe they have more electronics in that box, I don't know. But ALL it does in reality is change the intake air temp value, the same thing a resistor could do.
    2015 Rosso Abarth - MAD FIAT - 5 Speed - Phase 2
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    Quote Originally Posted by aelfwyne View Post
    I doubt that's even possible with the NA 1.4 multiair. You'd have to get rid of the multiair block and ECU control, replace it with a hot exhaust cam, replace the intake cam, port the head, use a custom ECU, probably work the crank over, and basically do everything nobody's been able to do before with the full resources of an engine fabrication expert at your disposal - and you're still just dealing with 1.4 liters.
    No disagreement from me! I think the the hp/displacement of modern engines is quite good given the reliability and drivability of them. DI, VVT and modern combustion chambers have yielded more hp and when you couple that with emission controls that make them very clean it makes for quite an impressive package. (Again, I am speaking generally about many modern engines. No DI on our cars and I am somewhat thankful for that.)
    2014 Abarth, Rosso/Nero, basically stock w/a few trinkets.

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    a turbo engine can be purchased for $2500. you will spend that much getting decent power out of the na car.

    you could in theory swap parts to make the motor a EU Multijet style motor with twin cams instead of our multi air. Go check out the scara73 site and have him make you some parts like an ITB setup etc.
    2013 Abarth OFT tuning, Eurocompulsion FMIC, Wheel stud conversion, Falken 615k tires, Custom intake, RRM pulley, NGen coils, GFB DV+, CPR Strut tops, Vogtland x-overs, NEU-F rear bar, NEU-F torque arm insert, Custom hood vent, Assetto Corse style front grille, Craven stubby antenna, Custom machined armrest delete, custom rear seat delete, boost fix mod, black vinyl roof.

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    That seems like way to much money for so little gain. I guess I am going to just leave it how it is and buy a wrecked abarth cause I have been finding them for about 2500 to 3k. So it seems like my money will be spent on building a race car.

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