TeeLew
Well-Known Member
^ That's the trick. It's not an issue of physically up or down shifting. It's figuring out the best place(s) to do it.
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How much did rake change with the spring rubber up front? I would imagine less rake, so don't rule out the possibility of that change contributing to better performance. I do agree though that much stiffer front springs work on these cars even though you aren't close to the area I'm thinking of in terms of being 'stiff'.I did a test/tune day last weekend. I've changed around the engine quite a bit since the last time out, but I'm still on stock boost, so not a ton more power. It runs on the top end much, much better. Ford has that screwed up on all the Eco's, HPP or otherwise.
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I'm running a 950# rear spring, which conventional wisdom tells us is a reasonable match to my front. I don't think it really is. I feel like the rear is entirely too stiff on this spring. I've previously noted I like a car to understeer as long as it does it in a predictable manner. This will do both. I get U/S or O/S based off my feet, but the rear never really feels as if it rolls or squats much. The front moves, but the rear feels entirely too rigid. When the rear does slide, it's an abrupt breakaway and has poor recovery. The commonly used term is 'flat slide' and it's an indication the car is too stiff for the conditions. This spring might be appropriate for a good track, but I tend to run on low grip surfaces, so I'm going to drop the rear spring significantly and see where we end up.
The spring rubber has a 38 mm section width and the coils are spaced about 43mm apart. Because of this, the coil has to compress a bit before it has an influence. It didn't change static ride height much, but it will have raised it some. That picture I posted is on the ground, so you can see it's not overly squeezed. The next time I get someplace flat I'll check it out the actual difference. My front springs have a relatively large drop (35mm), probably enough to get the geometry a bit ugly, so raising this change might be a gain a couple different ways.How much did rake change with the spring rubber up front? I would imagine less rake, so don't rule out the possibility of that change contributing to better performance. I do agree though that much stiffer front springs work on these cars even though you aren't close to the area I'm thinking of in terms of being 'stiff'.
When you are tuning your shocks are you able to differentiate between compression and rebound control? Loose on exit like you mentioned can be too much rear compression force and/or not enough rear rebound. Shocks shouldn't be much of a factor in steady state cornering other than being responsive to minute driver inputs to maintain balance.
Did you measure any tire temps? Curious if you are getting heat in the rear tires.
Might only be too much spring for your tires under that day's temperature and dust conditions. It might be worth the effort to try the same settings (and springs) when conditions are more favorable. If nothing else, you might get an idea of how sensitive it all is to the conditions of the day.I'm running a 950# rear spring, which conventional wisdom tells us is a reasonable match to my front. I don't think it really is. I feel like the rear is entirely too stiff on this spring.
I've previously noted I like a car to understeer as long as it does it in a predictable manner. This will do both. I get U/S or O/S based off my feet, but the rear never really feels as if it rolls or squats much. The front moves, but the rear feels entirely too rigid. When the rear does slide, it's an abrupt breakaway and has poor recovery.
I had Torrie (Unleashed) do that too.It's just that initial tip-in that I'd like to soften.
He actually - having DSC controller - can run a Normal mode throttle map and upload whatever he wants as Magnaride calibration for that mode (and turn off all the Advancetrac crap). It effectively solves the problem of non-GT350 cars having preset modes without ability to select suspension mode independently.TeeLew are you running in Sport or Track modes? At least on the GT the Ford throttle response maps are too twitchy for smooth driving IMHO in anything beyond the default mode. The EcoBoosts also have a lot of torque down low which might also be making it worse. Anyway yeah, I think its a smart idea to make that throttle mapping more linear for more control. I would guess that a tuner would assume you want a fast throttle map, but no, not for our purposes.
In other sanctioning bodies this is determined by the plan (top) view of the bumper, not the stock splitter.CAMC aero question - "Front splitter, air dam, and/or spoiler may be added below the bumper and may extend a maximun of 6.0” forward from the integral bumper as viewed from above or the original body excluding non-integral bumpers."
For our S550 cars, does that mean 6" forward from the front edge of the factory splitter or 6" from the painted portion of the body?
Anybody seen this rule tested yet?