GR86 - Understeer Alleviation - RCE Tarmac 2 (7k square setup)

[ZDan]

Originally Posted by Tomyyyu

I would avoid the rear bar. 949 is pretty adamant on that and he’s a knowledgeable poster.

Going from 15mm to 16mm rear bar (29% stiffer) isn't going to hurt anything and is just about the easiest/cheapest thing to do. Also not likely to help if the issue is really front bump travel and being on the outside bumpstop midcorner...

[Tomyyyu]

Got it aligned and corner balanced.

7 out of 12 gallons. On RPF1 17x9 A052 245/40/17.


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[ZDan]

Originally Posted by Tomyyyu

Got it aligned and corner balanced.

You went to the right place! Those guys are da best...

Are you in COMSCC? Come to NHMS next month!

[Tomyyyu]

Originally Posted by ZDan

You went to the right place! Those guys are da best...

Are you in COMSCC? Come to NHMS next month!

I’m a CT person who drives two hours to and from Devens MA. Love that site too much.

Tried others, but Devens had the most competitive talent and lovely site.


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[Tomyyyu]

@ Went ahead and measured my center of wheel to fender and ended up with these heights. Are these too tall? Leading to too little droop travel?

RF - 14 2/16”
RR - 14 6/16”
LF - 14”
LR - 14 8/16”


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[Racecomp Engineering]

Originally Posted by Tomyyyu

@ Went ahead and measured my center of wheel to fender and ended up with these heights. Are these too tall? Leading to too little droop travel?

RF - 14 2/16”
RR - 14 6/16”
LF - 14”
LR - 14 8/16”


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That's almost stock height in the rear, which I would say yes is too tall!

- Andrew

[Tomyyyu]

Originally Posted by Racecomp Engineering

That's almost stock height in the rear, which I would say yes is too tall!

- Andrew

Gotcha. So I got it corner balanced to follow my heights of 140mm front and around 145-155mm rear. That’s from floor to pinch weld.

Wondering if it makes sense to just leave it as is for now, what would you recommend? Corner balanced weights attached. Since the rear was raised to get my cross weights correct.


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[cmiovino]

Originally Posted by Tomyyyu

@ Went ahead and measured my center of wheel to fender and ended up with these heights. Are these too tall? Leading to too little droop travel?

RF - 14 2/16”
RR - 14 6/16”
LF - 14”
LR - 14 8/16”

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You'll have the same issue I had earlier this year doing the same thing. it'll ride "ok" on the street, but at speed, like autocross or track, you'll be lifting the year tires up constantly. Your RPMs will be shooting up to redline putting any power down out of turns. The rear will also hop around a lot.

My height with issues (center hub to fender):

Front 13 1/4"
Rear 14 1/4"

My height after lowering and allowing more droop travel (drives great now):

Front 12 3/4" ("one finger gap")

Rear 13 1/4" ("two finger gap")

It sounds like you're literally 2" too high in the front and at least an 1" in the rear.

[ZDan]

Originally Posted by Tomyyyu

@ Went ahead and measured my center of wheel to fender and ended up with these heights. Are these too tall? Leading to too little droop travel?

RF - 14 2/16”
RR - 14 6/16”
LF - 14”
LR - 14 8/16”

A bit on the high side, I'm about 1" lower all around. That said, *if* you are bottoming the outside front you might need to run higher...

You might run it as it is and assess the handling situation, then lower all four corners about 12mm or 1/2" and see what that does to handling and balance, and go from there.

[Tomyyyu]

Originally Posted by ZDan

A bit on the high side, I'm about 1" lower all around. That said, *if* you are bottoming the outside front you might need to run higher...

You might run it as it is and assess the handling situation, then lower all four corners about 12mm or 1/2" and see what that does to handling and balance, and go from there.

Yeah, my plan is probably to run it as is. Then make adjustments. Since technically I still haven’t ran it yet.


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[Tomyyyu]

Originally Posted by cmiovino

You'll have the same issue I had earlier this year doing the same thing. it'll ride "ok" on the street, but at speed, like autocross or track, you'll be lifting the year tires up constantly. Your RPMs will be shooting up to redline putting any power down out of turns. The rear will also hop around a lot.

My height with issues (center hub to fender):

Front 13 1/4"
Rear 14 1/4"

My height after lowering and allowing more droop travel (drives great now):

Front 12 3/4" ("one finger gap")

Rear 13 1/4" ("two finger gap")

It sounds like you're literally 2" too high in the front and at least an 1" in the rear.

What is your setup? That will help paint a better picture.


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[cmiovino]

Originally Posted by Tomyyyu

What is your setup? That will help paint a better picture.


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RCE SS-1's (6k springs, even), with their camber plates up front, OEM ones in the rear.

Vorshlag vs RCE/KW camber plates won't make a huge difference in height between the two, comparing the two setups in terms of height should be very much the same.

[Tomyyyu]

Originally Posted by cmiovino

RCE SS-1's (6k springs, even), with their camber plates up front, OEM ones in the rear.

Vorshlag vs RCE/KW camber plates won't make a huge difference in height between the two, comparing the two setups in terms of height should be very much the same.

Yeah comparing two different things. So I’ll just have to see how it works out, lol.


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[strat61caster]

949’s ride height suggestions have a lot to do with their damper design droop/bump lengths, it shouldn’t be gospel, but I think it’s a great starting point.

@Spuds do you have the big oem tapered bolt in the upper hole of your strut? You have to use some level of camber bolt, even just the smaller oe bottom bolt to get past -4 degrees of camber even when the struts are slotted.