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07-04-2018, 12:06 PM | #15 | |
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In your place i'd keep using primacies though. They are not THAT bad of tire, too expensive though to be bought as next set, once initial set is worn through. |
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07-04-2018, 12:29 PM | #16 |
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27 years of racing and owning porches (not sure what that matters but, hey) and you dont know how to dial out a little understeer?
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07-04-2018, 01:39 PM | #17 |
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Someone correct me if I'm wrong, but I think adding spacers should slightly reduce the roll stiffness on the axle to which they are applied. Since you put spacers on the rear only that should shift the balance toward understeer; adding front spacers (and/or camber) should help.
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07-04-2018, 03:33 PM | #18 |
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The Primacies were gone on the first day I had the car. Sold them in a couple of hours on Craigslist. I'm an old guy and didn't want to wait until the Primacies were gone to upgrade (who knows, I might be gone tomorrow or killed when my wife finds out about my girlfriend). You're right, they aren't bad tires, but the PS4S are a LOT better.
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07-04-2018, 03:50 PM | #19 |
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I know you're taking every opportunity to take a slight, but honestly, I never had to play with the suspension on my Porsches -- only wheels and tires. Track days were for fun with me, and not serious racing. I owned only 928's and my last GTS was stroked. Aside from track wheels/tires, I made no mods. I have a lot of knowledge about wheels and tires and corporate strategy was my avocation, but I'm a novice at suspensions and FI, especially with the BRZ. I do know how the car drives, however. And yes, that's a highly individualized perception and each of our sensitivities are different. I took off the spacers this morning and went for a drive. The difference didn't seem as pronounced as I remembered going the other way, but it was there. The car felt more nimble and controlled. I don't go to the track anymore and don't push my cars as much as when I was young, so how the car feels going about town is of prime importance to me. And no, you won't convince me that wide tires/wheels on this car when NA makes sense from a performance perspective. Looking back, I should not have been so concerned about a more flush look and just stuck to my guns about performance. However, I do read these forums and so many of you run with spacers I thought I'd give it a try.... Done...
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07-04-2018, 04:30 PM | #20 | |
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I agree. Wide tires are fine for chasing times, but it doesn't make for a fun car. I've been setting my car up to be fun, not for lap times, and it's not easy to pick mods that complement each other and improve the feel of the car rather than the measurable capability. That's why I run 215/45/17 tires (max performance summers) on a 17x7.5 15lb wheel. The 0.5" wider wheel helps reduce squirm, and they have 10mm extra offset over stock wheels. I run stock springs from a 2017 because most coilovers and lowering springs are too stiff for skinny tires. I use adjustable 19mm/16mm sways to dial in the rotation, and that's it really. The car feels light and nimble and most important of all; predictable and fun! |
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07-04-2018, 08:05 PM | #21 |
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When I went to FLZ's I noticed this. Felt great on track with my 245's, back to the stock wheels and tires the car pushed. Never noticed it before even though I was running spacers on the front to clear my BBK with my street wheels.
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07-04-2018, 08:54 PM | #22 |
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Why did you only put the spacers on the rear? Definitely should have put some up front as well.
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07-04-2018, 09:29 PM | #23 |
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07-04-2018, 09:50 PM | #24 | ||
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Nope, only put the rear ones in:
Quote:
Quote:
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07-04-2018, 11:01 PM | #25 |
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07-05-2018, 01:37 AM | #26 | |
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After some of you raised this issue, I did a Google search and here is what was posted: https://rennlist.com/forums/964-foru...ndersteer.html http://www.mycarforum.com/topic/2691...he-real-truth/ https://www.6speedonline.com/forums/...teristics.html https://www.evolutionm.net/forums/ev...ndersteer.html https://forums.vwvortex.com/showthre...-or-understeer http://www.maseratilife.com/forums/g...nly-wheel.html I admit I don't know as much about the BRZ suspension as you guys, but it seems the general consensus is that adding rear spacers very slightly increases understeer. What I've found over the years is that a car's geometry is quite complex and what seems to be simple answers aren't quite that. I'll report back and try to take real measurements this time. |
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07-05-2018, 02:06 AM | #27 |
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@Racecomp Engineering: can you tell how spacers - in rear - affect grip bias? In my eyes it should only change slightly suspension motion ratio and again only slightly increase track and load on rear wheel bearings and that's it, doesn't sound to me as something drastic. But if change in rear grip is that noticeable, i guess there is more to it?
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07-05-2018, 03:40 AM | #28 |
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Widening the rear will cause more push and less rotation in the corner.
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