Hi I was just upset about this after playing the game with my friend in split screen where he took a M3 E92 and I had a M4 and the M3 was faster in every way it just passed the M4 like nothing, this is supposed to be a simulation game hence real world, and just another where the S3 is much faster than the Golf 7R where they are actually the exact same cars in real life (same engine, same chassis) but actually the golf is a little quicker in real life. So yeah was just upset about this because Forza is supposed to be the best simulation game. 
This just isn’t right hopefully it can be fixed in an update or something but that’s way off realism.
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I just drove these two cars back-to-back to make sure, and the stock M4 was consistently about a second a lap quicker around Watkins Glen than the E92 M3. So if your friend was faster than you, it was because he was driving better.
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Hi mate yeah ive noticed this on loads of cars, the physics are all wrong. Very dissapointed as me n my bro do rollbracin comparison tests with stock cars…
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Flatdarkmars if you race them together, not lap times, the M3 is faster down a straight which it shouldn’t be.
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I’ll try some tests later, but I’m 99% positive that the difference you think you’re seeing could be made up by getting a better corner exit. The two cars are very similar in overall performance, so the largest factor in determining who’s fastest on a straight will be the quality of the corner exit immediately preceding the straight. When I get back to my XBox tomorrow I’ll run some speed trap tests checking maximum speed before the bus stop at Watkins Glen or maybe at the end of the Kemmel Straight at Spa.
There are some bugs in car performance and PI calculation in this game; see the well-documented '65 Mini Cooper issues. But I’m not convinced that this is one of them. I’m willing to be persuaded by data, not anecdotes.
Many cars are just wrong lol its something that wont be fixed.
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Do a drag race with the two using traction control and auto shifting so there are no variables and just mash the gas the whole time, this should yell you if you are right or not.
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Bingo it is not a drag race on a straight. The guy who is fastest on a straight is the guy who carried the most speed through a turn and had the best exit speed. Even if both cars had the exact same speed in a turn and exit speed it would come down to who was on the inside of the turn and who wound up on the outside of the turn. The guy on the inside is going to be in the lead on the straight and you might not have enough straight to catch and pass them before the next turn.
Good idea.
Here are my quarter, half, and 1 mile drag race times, with traction control & automatic transmission.
M4:
12.796
20.170
32.249
M3 E92:
12.963
20.220
32.300
I think these numbers are tilted slightly in the M3’s favor, as the TCS seems to bog the M4 down more aggressively off the line for some reason. Even so, the M4 still won.
So, OP, you see the M3 is not faster in a straight line. Work on your corner exits. A common error is carrying too much speed into corners and having to brake beyond the apex to avoid running off on exit. Brake earlier so you can get back on the power earlier and exit faster.
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Just race them with a friend on a straight together
What part of the hard data I’ve provided are you having trouble understanding? I ran the two cars in identical circumstances and the M4 was slightly faster. You raced them in non-identical conditions, with two different drivers, with no means of controlling for variations in corner exit technique, driving line, and driving style. You can cling to your ignorance, against hard evidence, and insist that the game is at fault. Or you can take this as an opportunity, learn something about driving, and use it to improve yourself.
Credit where credit is due, you do have one part of being a racing driver down cold. Real racing drivers are very good at making excuses and blaming their equipment.
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DAMN
xD
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alright mate calm down, whats your attitude for. The guy is makin a valid point as me n my bro using manual clutch did a roll race from 40 mph and the e92 m3 is quicker hands down. This is wrong how much you argue about it you ignorant fanboy.
Fact: the m4 was underated in power in horizon 2 aswel.
Another bit of info for you too moron the m3 hangs with a f10 m5 in the game whilst that would never happen in realife. Youtube m board.com and gt board then run your hard data senna…
idiot…
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I love statistics that can be interpreted both ways. The quarter miles time have a .15s slower time for the M3, whereas on the other tests it is .05 down. So after the quarter mile, it has reduced the gap, so would seem faster from a rolling start, as others have suggested. Whether with gearing differences this is realistic or not I don’t know, but I would suspect the M4’s turbo’d (but duller) engine would win it IRL.
LOL me too! 
We’re talking tiny fractions of a second, so the real lesson here is that the two cars are so close in terms of performance that neither is going to blow by the other “like nothing” as the OP claimed, without there first being a difference in corner exit velocity or some other factor.
In this real world test: https://www.youtube.com/watch?t=130&v=Ek0HyigXZmg
Each car is ahead at various points due to gearing differences, but both arrive at 270 km/h almost simultaneously, which shows that the straight-line results in Forza are at least plausibly close to reality.
Define “hangs with”. Autobild tested the F10 M5 and E92 M3 at the Sachsenring, and the M3, driven by automotive journalists, was about a second and a half slower than the M5 driven by Claudia Hürtgen, a professional racing driver. That’s close enough that driver skill could easily be the difference. Of course some tracks would suit one car or the other more, but at least at the Sachsenring, the E92 M3 does “hang with” the more powerful, but heavier M5.
Reference: Autobild Ultimate BMW M Model Track Melee - F10 M5 vs M3 vs 1M vs X6M vs E60 M5
Straight line racing know it all. Obviously a m3 is a better track car.
Agreed, thus its ability to lap in the same ballpark as the M5.
Matt DCay - also do you have differing shifting methods? IE he is running manual you are running automatic?
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Oh Snap!