Torques

Hi, I could go 265/40/17 at the rear but would have to roll the lips of the arches. Then it would be 235/45/17 at the front to have the same diameter at both ends. That combination is the same diameter as your 265/35/18 but on 17'' The trouble is, that there is a very limited number of tyres in 265/40/17. http://www.tyreleader.co.uk/car-tyres-265-40-17/ So I am marvelling if I should not rather stick with 245/45/17 all round. I'm unsure if 265 at the rear will vastly improve the ride / tractionbut it sure would have the looks .. Here's how it looks with 245/45 .. needs to be lowered 1cm.

Haha .. OK good point!

Haha .. Actually these tyres are very soft and traction is horrible if not scary! Makes for a good show though That's why I need to change them but they're okay for getting an idea about sizes / clearance (since the whole debate)

Thanks, 265 sounds wide is that also on the fronts? With 245 at the front and 30 offset the tyre seems already at a narrow clearance towards the arches.

Hi! Speedo error seems no too bad. (that's compared to the standard GTSTs) Look here: http://www.tacomaworld.com/forum/tirecalc.php?tires=205-55r16-245-45r17 And 3% longer gearing seems to be an option, Here's how it looks at the moment:

Alright, Thanks .. I was just thinking since 255 and 40 profile has smaller side-walls it would make a a real world difference (just by using the link I provided in my first post) I have the 245 on right now and clearance wise it seems ok

I got myself a pair of R33 GTR wheels for my GTST with 245/45/17 on them. They're snow/winter tyres since they came from Japan. I like the size since the tyre diameter is 2cm more than the standard 205/55/16 It looks good I find and gives good riding comfort. (have a lot of potholes and speed bumps here) In your experience is 245/45 a good choice for your cars or gives 255/40 more control? http://www.tacomaworld.com/forum/tirecalc.php?tires=245-45r17-255-40r17

Thanks mate, looks good!

Hmm That would possibly get a bit close to the arches and splash guards. But I will double check.

The R34 GTR rims are 9'' wide by 18'' But if you say 265 is no issue then that would leave me with more options. Do you have a close up picture? Is there any ballooning?

Hello, Are you on r34 GTR rims or R33? I got the R33 rims which are 9'' wide and I think the R34 ones are 9'' as well?

Thanks, Is it 35, 40 or 45 profile?

Hi, Thanks for that .. How well do the 265 fit on the 9'' GTR rims ?

Hi, Thanks .. The 245 do fit with just a slight rubbing issue on full lock and cornering on the right side only. I could remove the splash guard or just tread that area with a heat gun and push/mould the plastic back a bit. The wheels I bought are GTR wheels and came with 245 all round (but need to be replaced) Rear is fine with 245/45, and 255 40/45 should just about fit without any drama.

Hi, As for over / understeer does it make any noticeable difference on a GTST if fronts are either 235 or 245? I read that most people recommend 235 at the front, so is there any downside to 245? (Rear will be 255) Thanks

Ok .. cheers for that! The thought about carrying drugs across boarders is a valid point though!

Besides the obvious advantage of running flat is there any other advantage to these tyres? For example does the stiffness of the side-walls help to better control the car (less flex?) Thanks ..

Yep ... all valid points ... will go for the GTRs and see if 255 or 265 fit under the arches

OK, Thanks for the answers ... I'm well aware that this been asked a million times but the information is really scattered. Yep, I did re-search . but just wanted to have possibly a straight answer before I end up buying the wrong tyres. I read anything from (offset) +35 all round to +20 which sounds odd. I was going to measure the clearance myself to gain an understanding about which offset to chose (not just for the R33 GTR wheels) Also I'm still torn between the GTR wheels and 18'' Rota Grid Drift. Cheers ..

Yep ... I did look at the million posts But just thought someone could give me a straight and quick answer.

Would anybody know how centred the standard wheels sit on a GTST? (Offset is 40) I mean would I have more space to the inside or outside of the arches? (considering I'm going to roll the lips) Inside seems limited by the shocks and outside by the arches. I'm trying to figure out the best offset/ width for me. I found some 17'' 9' 30 GTR R33 wheels and am marvelling to go for it or not. What tyre width would fit nicely on a 9'' wheel without ballooning and still fit? 255, 265) Thanks!

Thanks, Yes, I don't want any more lag that's why I was investigating the ball bearing HKS. At current I like my setup / engine response and worked long and hard to achieve this. 260KW at the wheels is not bad and the car is fun to drive. I will check on the actuator just to be 100% certain. But as said the Turbo is rated at 400HP and I think I simply reached that limit.

HI! Misunderstanding: I did not say I need more airflow not boost, but merely said that it's not boost which makes the power. (since people always say you need such and such boost levels for such and such power) And of course If my boost goes up the airflow will increase. I will check the actuator but it is an adjustable one and the preload (of the spring) is pretty heavy. Btw: I can read my MAF values (voltage) in real time through Nistune. This is a direct representation of mass air flow (MAF) Cheers

I never investigated the wastegate but the actuator is set to one bar and the controller .5 bar higher. The turbo is rated at around 400HP (based on what it can flow) and boost drops gradually since the turbo can not keep up with air demand from the engine. You can see this on many dyno graphs that boost gradually drops and this is not due to the wastegate. (though a blown open gate is always an option) Boost is meaningless anyhow, it is the mass of air going into the engine which makes power (+ the fuel of course) Still I will check on the WG but I think that is not the problem, I just need a bigger turbo

Yes, but the engine outflows the hybrid-turbo so I can not up the boost. In other terms: The turbo can not deliver more flow and is running out of puff. That's why I am looking into other turbo options.