Yeah 20-30mm stagger is quite common. I run ar-1's 225 all around at the moment, production gti champ cars also have to run 225 all around and I think the TTcr cup do as well. Bigger fronts would be ideal but it's not like you're going to understeer everywhere without it. A good diff, a ton of front camber and some rear toe out will help the front grip great.
Depends on your budget really, remember Rob has a long list of race cars including Tcr cars so throwing 2k on a set of tyres is no big deal for them lot. If you're going to end up on that staggered setup but cant justify the cost in the best tyres e.g a052/direzza etc I would personally have a long think if its worth it compared to running the best tyres on a smaller or standard setup. But there is always the option of used tcr slicks (260mm) that are very cheap to buy, lots of mixed experiences on these, some people race on them and they do great where as others struggle to be as quick as the top semi slick roa legal tyres even.
I run 260bhp by the way with no diff currently, cage is planned for 2024 so diff will probably be the year after. It's too much power with an open diff really, I usually turn the power down to around 240 which is much more manageable.
I see your point, my car will be mapped on the 13th to stage 2 plus and it will hopefully be between 360 to 380 bhp with smooth power delivery from rtech. I have a wavetrack fitted and I think that should help the current grip is amazing but it's probably 240bhp with the added intake, 3.5inch downpipe and 3 inch system backed by the intercooler... So not much really to challenge the Michelin pilot 4 and the diff..
My thoughts have been to keep the 7.5 inch with Michelin pilot 4 and test the power and then decide if to go light 7.5 inch rim and 235 all round or go with staggered tyres on wider rim...
I'm running b14 at the moment with superpro handling pack and arb which are fitted from previous owner and on the road it's good and neutral, I'm not sure how well the b14 are going to be on track and sticky tyres so looking to spend £3200 on area motorsport spec ed Nitron was the plan... 😎 plus the verkline LCA and hard race goodies which will then be as good as their race car setup... Hopefully 🤩
Snetterton is open on the 18th this month so hopefully I can make it an test the setup as is to give me some level of understanding of where to trow the funds towards 😁😄.
Would definitely want a set of rims for track use only so it's just a question of width cost and do I leave the b14 for a season and try them or move on to a complete setup from start 😱😂
What coilover and setup are you running? Also some advice on seats would be great as well👌🏼