I have also experienced this issue of the inside front wheels lifting on the older Porsches, i’ve also seen it happen on a 1973 Porsche 911 Carrera RS that i was following around VIR infield section in a career race (I can’t remember the name of the ribbon), But I just put this down to a badly adjusted rear suspension on the base tune after race suspension is fitted, which i tuned out by raising the rear ride height and stiffening the rear ARB, springs and dampers a bit. This cured the problem for me.
I have also seen this in the Meyers Manx and the Mercury 49 Coupe. The Manx lifts the front wheel and slams it repeatedly. The Mercury lifts both wheels on turn-exit even on smooth ground. The physics seem odd in the game and uncharacteristic for Forza.
The only fix for the Mercury I found was to slam the suspension and max out the setttings in proportion to each other. It helped with the inside wheels (both) lifting a lot and now only does it on a tight corner exit or high speed turns. the Manx is seemingly hopeless to me. Ive noticed a lo of the older cars seems to have too much tire roll or too much grip for the chassis. They still flex and lifts tires even with roll cages and VERY stiff suspensions.
Nice write up Ialyrn. Very detailed and thorough. It seem like you did not have the same experience I had.
I am on Xbox1 and I tested the Carrera in free play with no assists, 23 unbeatable AI on Road Atlanta Club. The 911 was stock with no adjustments and it was not fun to drive. The balance of the car is strange and it causes the front wheels to lift and requires input corrections just to control it. This is a wasting energy on control corrections and taking away from forward momentum. The handling can be corrected with suspension and arb upgrades but I parked after a 10 lap race to wait for a patch.
I have played every Forza and some cars do not behave like they have in the past. I think Forza 7 physics are excellent and some cars are not happy with it. The non adjustable suspension on some cars could use some Turn 10 tweaking and some cars need the balance of weight adjusted. I have never witnessed a stock 911 Carrera pull both front wheels off the ground while navigating an uphill sweeper.
I was racing in the prototype series last night in the 60s ford GT40 tuned up to homologation specs. (Stick tires, max rear width, 590hp, supercharged with race weight reduction/brakes/arb/suspension. Built this car myself and even with lots of tweaking it does not take much to get major understeer under power and front end washout, especially through crests like right before the finish after the chicane of road Atlanta. I think the new physics of F7 let the cars become too stiff with too much grip and the result is tripoding and wheelies. Neither of which do you any favors in the corners.
you say stock but did you reset the build or did you buy it stock?
If you mean me @Uber, than yes. I made sure to make sure the game had not auto applied any upgrades, so the cars where completely stock.
not you , to ajd440ex38.
I don’t remember how I acquired the car but it could be homologated. I did nothing to the tune and just test drove it at Road Atlanta Club. I had no desire to deal with it at the time because I knew it would need to be reset and rebuilt. I was working on the Porsche achievement last week.
The issue could be the build but also it is the tune.
Reversing around the corners and over the bumps solve the issue. I have it with a few Porsches and my modded Karmann Ghia is the worst of all it lifts at every opportunity bump or throttle on after a corner.
I’m glad this is getting more mentions as it is soooo annoying. Another to have a go in is the 4.0ltr RS. on the Nurburgring up the hill after bergwerk. The fast left hander just lifts the front end up and off you go. I’m sorry but I’m pretty sure the real car doesn’t just lift up regardless of the rear engine layout.
As already said it’s like the ‘nothing in the front, weight in rear’ physics is really over done which I’m sure Porsche would be really pleased with!
The differenz between Real Porsche and Turn 10 Porsche is hugh. If they sell Cars with this handling characteristics the sales fell by 95 percent. The other 5 percent die on the Way to work because they lost the control over the vehicel 
Maybe we can buy stones… put it in the trunk… for 9,95$ as DLC
People complaining about the Porsche’s (especially the GT2 RS cars, I tested the 2012 and the 2018 variants) should really check out my linked video and post on page 1. Not once did I have an issue where the front of the cars lifted under acceleration, or even while going round sweeping corners.
I even provided video footage of my test runs in the cars people where complaining about before I responded. Non of the people in here stating the cars having issues, have shown a single piece of visual (pictures and/or video) evidence to back up their claims. Hell, people are not even stating if the cars are stock, homologated, or custom built/tuned. I tested them stock, but homologated and custom built/tuned could easily be a factor in this; but people need to be clear and concise about their particular scenario instead of blindly complaining. No one, especially T10, can help if the actual details are missing in the posts bringing this stuff up.
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The phenomenon exists, whether it is realitic or not I dont know, never have I driven a real rear engine car on track. I very much doubt a real car would do such lifting though. I will test it later, one of the rs2’s did it constantly on me, homologated, stock tuning. Will post findings later. The reason it feels so unnatural is the scripted feel of the lifting, you get the same sound effect of springs comppressing and the same excact amount of lift every time.
ThanaJ
I think what lalryn is trying to say on the testing and comparisons is that a car being homologated could be what is causing the problem. If the car has been homologated, it is not stock, but has been upgraded usually with parts and probably auto tuned by the game. If the car was aquired by level up rewards it has been homologated by the game.
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Cars in which I’ve personally encountered the problem (all stock). I’m sure that’s not all of them:
1968 Abarth 595 esseesse
1968 Alfa Romeo 33 Stradale
1964 Ford Fairlane Thunderbolt
1968 Opel GT
2018 Porsche 911 GT2 RS
2012 Porsche 911 GT2 RS [997]
1995 Porsche 911 GT2 [993]
1973 Porsche 911 Carrera RS
Where?
Basically Nordschleife from the very beginning, but it can happen anywhere, where the road isn’t flat I think.
How?
Accelerate early out of a sweeping turn, then try to change direction. Quite often you won’t be able to countersteer because front wheels are already in the air. When they will hit the ground you’ll hear characteristic sound.
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Ok, so I tested the 1995 Porsche 911 GT2 out at the Nordschleife, stock (rental). I was not getting this lifting that you all keep going on about, but the car is bouncy. It is also bottoming out on the track. That however isnt a physics issue, its just that the Nords is a bumpy track, and the car is not setup for it. It is too low, and it is too soft on the suspension. Baring that, I had zero issues, nor did I have happen what you all keep describing. Attached below is a video of the '95 GT2, it is live gameplay plus the replay cam. I suggest you watch it all, as you can clearly see the car bottoming out in the replay.
1995 911 GT2 - FM7 | '95 Porsche 911 GT2 | Nordschleife - YouTube
So obviously there is no lift at all.
If only 1 front tire is in the air the steering becomes unresponsive, so the car keeps going untill all wheels are back down. Resulting in loss of control.
So if the rear starts to break out you cannot countersteer, is will continue to break out untill the front is back down. And even then there is a slight delay before you can countersteer.
Making it impossible to catch
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I just can not get it to happen on my end. But thank you for the picture, you are the only one I have seen even attempt to show what you are experiencing.
I am testing the cars, but they are fine for me. I did a run with the 2012 GT3 RS4.0 you show in the picture, I have that one rendering out at the moment to upload to youtube. I will link it once it is uploaded.
I will say however, the GT3 RS 4.0 is equally as bouncy as the 1995 GT2, if not more so. And again, bottoming out was an issue on this car. Depending on how you hit a bump in the road or a curb, it could cause what you are all experiencing. If my line is even remotely different to yours, the results wont be the same. It is coming across to me as a possible suspension tuning issue. Ride height too low and the suspension to soft, which I suggested above.
I also tested the 2018 GT2, and that one has being the nicest of the bunch to drive thus far. I also recorded that footage, but again, my results are opposite of what you are all saying. At this point, I honestly don’t know what to tell you. This just isnt happening for me.
The car does a little hop at the 45-47 second mark in your video, you can even hear it too.