Did a dyno run today - Alfa Romeo Bulletin Board & Forums

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post #1 of 36 (permalink) Old 08-31-2016, 03:26 PM Thread Starter
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Did a dyno run today

Was surprised to see the WHP so close to the stated BHP

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post #2 of 36 (permalink) Old 09-02-2016, 05:40 PM
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Was surprised to see the WHP so close to the stated BHP

http://www.youtube.com/watch?v=t71LI...layer_embedded
Is she totally stock? That seems to verify that Alfa low balled the HP ratings on these, kind of like what BMW continually does. Have read other reports that real HP is more like 255-260.

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post #3 of 36 (permalink) Old 09-02-2016, 06:56 PM
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They do tend to dyno high compared to Alfa's published numbers, which is a good thing.
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post #4 of 36 (permalink) Old 09-04-2016, 08:38 AM Thread Starter
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Is she totally stock? That seems to verify that Alfa low balled the HP ratings on these, kind of like what BMW continually does. Have read other reports that real HP is more like 255-260.
100% as it came from the factory, but it does have the "sport tuned exhaust" for whatever that is worth. I think all that really does is make it louder
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post #5 of 36 (permalink) Old 09-05-2016, 09:57 AM
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Is she totally stock? That seems to verify that Alfa low balled the HP ratings on these, kind of like what BMW continually does. Have read other reports that real HP is more like 255-260.
100% as it came from the factory, but it does have the "sport tuned exhaust" for whatever that is worth. I think all that really does is make it louder
The sports tuned exhaust has no muffler. It's also known as the racing exhaust. The standard exhaust has a muffler. If there is a performance difference, AR isn't talking. Having heard the two side by side, I much prefer the sound of my muffler-less exhaust.
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post #6 of 36 (permalink) Old 09-05-2016, 09:34 PM Thread Starter
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Yeah, I doubt a free flow muffler design would hurt the performance any, but it certainly sounds great without mufflers. The little 500 Abarth doesn't have mufflers either, and it also sounds fantastic.
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post #7 of 36 (permalink) Old 09-06-2016, 07:29 PM
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The factory exhaust (both the standard and AR Racing exhaust) is fairly small diameter (48mm OD from memory).

There are definite power gains to be had from going to a larger diameter cat-back exhaust. This doesn't really make it louder per se, but rather deeper sounding.

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post #8 of 36 (permalink) Old 09-07-2016, 06:06 PM Thread Starter
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If you're modifying things then might as well go cat-less. A single exhaust pipe would probably be more efficient as well, but it wouldn't sound or look as good.

The part of the stock exhaust that I think is odd is the flex pipe. The engine does move around quite a bit back there, tho.
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post #9 of 36 (permalink) Old 09-08-2016, 07:42 AM
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I realize that as forum members and 4C owners, we all live in different parts of the world where we all have different rules and regulations to live with. Here, where I live, removing the catalytic converter is illegal. Sure, we could put back on every two years when we have a mandatory smog check. Unless the car is a dedicated track car and gets removed from the system, it's just not worth it.

A better path would be to install a high flow converter. From the new cat, a large bore single and straight pipe would be ideal. Magnaflow builds the cat-back, Centerline is the only distributor. Mine cost about $1000 USD, but I stayed with the stock cat. The kit includes new grills and the flex pipe. I haven't installed it yet, the few that have says it's got a nice sound and the car feels faster.

I think Madness sells a exhaust of the same type.
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post #10 of 36 (permalink) Old 09-08-2016, 04:27 PM Thread Starter
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oh yeah, removing the cat is illegal here as well. I'm a scofflaw, so IDGAF...
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post #11 of 36 (permalink) Old 09-08-2016, 04:32 PM Thread Starter
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Oh! You're in CO right? There's certain counties in CO that don't do emission checks... I had my Bronco registered in Park county the entire time I lived up there because when the smog pump on it broke I just removed all that junk. If you want, I'll let you use my Park Co. address to register your cars. For a very small fee of course

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post #12 of 36 (permalink) Old 09-10-2016, 06:43 AM
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Interesting data.
Now go slap a EuroCompulsion Phase 2 tuned ECU and intake on her, and try again!

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post #13 of 36 (permalink) Old 09-11-2016, 01:34 PM Thread Starter
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I like the EuroCompulsion intake, but I'm not really a fan of generic tunes. I'll have it custom tuned on the dyno when I get around to it.
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post #14 of 36 (permalink) Old 09-14-2016, 09:32 PM
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You guys need to look closer..................
It says on the screen "233hp at engine".

Most dyno's these days do drivetrain loss calculations. The trouble is, most people are still saying "at the wheel" and implying that there is more power at the engine.

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post #15 of 36 (permalink) Old 09-15-2016, 02:05 AM
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No it doesn't, keep reading and you'll see that it says "at engine rpm 575 (obscured)" so it's telling you what engine speed the maximum power was at not that the power figure is at the flywheel.

It may be that the dyno has done a calculation for transmission losses but that information isn't shown on the video so we can't conclude either way from the evidence here.


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