LVDell

Alright, so I'm taking the Turbo to the track next weekend and mounted up my track wheels and tire:

Turbo Twist Hollows (pic attached) with NT01 rubber (245/40/18 and 315/30/18)

THe problem I have is in the front. There is VERY LITTLE clearance between the tire and the shelf that holds the spring. I assume that shelf (have no idea the real name for that part) is a static piece that does not move on compression or rebound and the tire should increases in size either but the small gap between the two pieces have me wondering if that is safe.

Picture is taken of the front passenger side from underneath the car. Suspension is the X73.

Any advice? Insight? Suggestions?

I have to admit, I'm stumped. Have an email into my race shop as well.

TIA!

elh0102

Dell, I think that's the spring collar on the strut. I have had cars with small clearances there, and never had a problem. I think that normal deflection in the suspension would allow more lateral movement than vertical. Any compression/rebound movement at the hub should be the same at the strut. I bet your race shop contact will have an answer.

RollingArt

How much clearance do you have there?

Can't tell by pic.



Phil

RJFabCab

Dell,

I'm no race engineer , but that looks like the ginormous lower spring perch on the X73. The X73 has rather large springs up front that, interestingly, aren't concentric with respect to the damper (unlike the rears).

I think the large base diameter of the spring combined with the angle offset are why the lower perch is so large.

How much clearance do you have above the front tire before meeting the lower perch? One inch? Your race rubber is maybe 0.3" taller in radius compared to the OEM 225/40/18... moving you a tad closer, but that relationship shouldn't change since the perch is fixed to the damper.

Personally, I'd be more worried about the fender edge rubbing on the fronts with the wheel turned under compression.

I know your driving , and couple that with a softish spring in a somewhat heavy car with some taller, fatter tires up front...

If this doesn't pan out, you can borrow my 16's off the Lotus for the weekend.

Car looks BAD ****, btw!

AllanJ

...more like if this doesn't pan out I wonder how long it'll take Dell to go GT3 shopping.

LVDell

If they only had back seats I would have grabbed another over the Turbo in a heartbeat!

It is ginormous (is that even a word ) See the pic attached. It's not like the coilover in the rear.

I think the large base diameter of the spring combined with the angle offset are why the lower perch is so large.

How much clearance do you have above the front tire before meeting the lower perch? One inch? Your race rubber is maybe 0.3" taller in radius compared to the OEM 225/40/18... moving you a tad closer, but that relationship shouldn't change since the perch is fixed to the damper.

Personally, I'd be more worried about the fender edge rubbing on the fronts with the wheel turned under compression.
Who me? I'm like a grandma on track

Danke

Just had a chance to go get a rough measurement. I took various diameter screwdrivers a rolled them over the edge of the tire until I felt one touch. The 5mm diameter one was easy. The 7.5mm one got through easily but did touch the metal softly on the spring shelf.

The problem is the tire is round and the screwdrivers are straight so I have no idea if there is MORE than what I measured.

RollingArt

5-7 mm should be plenty. You may just get light rub marks on the perches under heavy tire deflection.

I think we've run with less clearance with our rain tires.

Just keep an eye on it. I think you'll be fine.



Phil

AllanJ

Wow, that is huge! No more tight GT3 springs. Back to wide-assed cushy turbo springs. How does that Spinal Tap "Big Bottoms" song go again?

ok...being serious for a sec....you should be ok. You've got room for 1/4" of deflection. If you take it easy on your first session and then have a look, you should be able to determine if minor rubbing is occurring.

LVDell

That's what I'm thinking. I just get very OCD when it comes to tires and brakes

And yes, my big bottom girl is going to show me what she can do. I do like me some curves on my girls

At least I know what I can do in a GT3 in track prep form. Let's see what a stock Turbo can do. I'll report back after the event next weekend.

AllanJ

Sounds good, Dell. Experimenting and playing is fun. I've been seeing what heat cycle #23-#28 is like on my Hoosier R6. Ain't that sticky.

Cheers,

RJFabCab

You will be cracking up trying to hussle those GINORMOUS perches around Left Hook.

It will be a blast tracking that TT... the AWD and the power make for some fun.

I'm curious as to what your experience will be up the esses at speed with the X73. No doubt, a marked improvement over the stock setup.

007DT

It was modified like 15 minutes after you bought it...

You're greasing the skids for the lap times you'll be posting.

AllanJ

lmao!

MrWhite

245/40 ist a difficult size to fit w/o rubbing somewhere, I ran into problems with that size, rubbing at front fender edge (where it meets the bumper). That was with a pretty low rideheight. Not sure 255 will work with that strut though.

LVDell

My bad, those smoked side marker lights easily add 5hp!

In all seriousness, I haven't touched the car enginewise like most Turbo guys so the power is totally stock. Haven't changed any suspension bits except for the OEM sport shocks. Other than that, full rubber based suspension and heavy as a ****!

And I don't plan to do ANYTHING to the DME power mapping of this sucker until the factory warranty expires in 2 years. Then.........ALL BETS ARE OFF!!!!!