Interior redline sometimes not matching HUD redline?

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I just took the Ford GT '05 for a drive and noticed that the redline on the modeled interior tachometer doesn't match the redline on the HUD tachometer, and I have also seen this issue on a few other cars in the game. For the aforementioned car, the interior tachometer redlines at 6500 RPM whereas the HUD tachometer redlines at 7000 RPM. So why do deviations like this occur for some cars in GT? Is it because these cars aren't simulated properly, or is it the result of modeling error? The latter I find most unlikely, but is there some good explanation?
 
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Maybe you fitted power upgrades that change the max RPM of the car. You should take note of those upgrades. Those are:

- engine upgrades (each stage adds 100 RPM)
- exhaust (each level is 100 RPM higher than the previous one
- computer (200 RPM)
- catalytic converter (200 RPM)

All in all you can raise a car's max RPM up to a full 1000 RPM.
 
Is it upgraded? Some modifications increase the redline on cars.

Maybe you fitted power upgrades that change the max RPM of the car. You should take note of those upgrades. Those are:

- engine upgrades (each stage adds 100 RPM)
- exhaust (each level is 100 RPM higher than the previous one
- computer (200 RPM)
- catalytic converter (200 RPM)

All in all you can raise a car's max RPM up to a full 1000 RPM.

I rarely add modifications, and the Ford GT I mentioned has only received an oil change, otherwise fresh from dealership. Good to know though.
 
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That oil change could be to blame for that redline difference.

It's not the oil change, I can confirm that. In fact, I'm noticing more and more unmodified cars that have these redline deviations. Can someone clarify what is going on?
 
It's not the oil change, I can confirm that. In fact, I'm noticing more and more unmodified cars that have these redline deviations. Can someone clarify what is going on?
What is probably going on is quite simple. The HUD redline displays the true redline of your car. Manufacturers sometimes mark it below its actual number.

A real life example: On a Fiat 500 Abarth, you can actually go 500rpm above the marked redline before you hit the limiter.
 
What is probably going on is quite simple. The HUD redline displays the true redline of your car. Manufacturers sometimes mark it below its actual number.

A real life example: On a Fiat 500 Abarth, you can actually go 500rpm above the marked redline before you hit the limiter.

Does the "actual number" refer to the limiter, and are you implying that the HUD redline in GT6 corresponds to the limiter? It does not as many cars in the game can go at least 500 RPM past the HUD redline before the limiter kicks in. This is also true for the Ford GT '05 I used as an example, meaning that there is a 1000 RPM difference between the interior tachometer redline and the limiter, but only a 500 RPM difference between the HUD tachometer redline and the limiter. That seems kind of weird, doesn't it? The Abarth 500 you mentioned has corresponding tachometer redlines (interior and HUD) in GT6, and its limiter is definitely 500 RPM above the redline.
 
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Does the "actual number" refer to the limiter, and are you implying that the HUD redline in GT6 corresponds to the limiter? It does not as many cars in the game can go at least 500 RPM past the HUD redline before the limiter kicks in. This is also true for the Ford GT '05 I used as an example, meaning that there is a 1000 RPM difference between the interior tachometer redline and the limiter, but only a 500 RPM difference between the HUD tachometer redline and the limiter. That seems kind of weird, doesn't it? The Abarth 500 you mentioned has corresponding tachometer redlines (interior and HUD) in GT6, and its limiter is definitely 500 RPM above the redline.
By "actual number" I meant the limiter.

Hmm... I actually don't know... PDI isn't known for its lack of bugs...
 
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