Two part structural foam to reinforce the frame rails

[Infinitiguy19]

After reading a 128 page (yada yada, blah blah...) I saw this:

After you install front shock tower braces you will notice that the chassis is still deflecting a substantial
amount [after all it is a luxury car].
The frame rails can be reinforced internally with 2 part structural foam. The Q already uses some in entire A
pillar, upper B pillar, and a partial stiffener running across the pan under the B pillar tying the two sides
together....Good but nowhere near enough!
Each kit fills approximately 1 cubic foot of space...you will need 5 kits to do the job correctly and this will add
8-9 pounds to the weight of a Q. http://www.itwfoamseal.com/auto_after_o ... market.htm

PS: my car handles an order of magnitude BETTER than Brand NEW without OEM soft tires ......with them
it is tremendous but a pain to keep them balanced.
I have spent over $5,000 in parts cost alone experimenting with every changeable aspect in every combination [3 different rear sway bars, 2 different front bars, stock and lowering springs [even front/rear
mixed], bushings, rear sub frame, new front cradle, and suspension arm replacements.
Not to mention hand making rubber bushings and isolators out of 5 different durometer rubber stocks. Extra
vibration dampers on exhaust....have a few more tricks using urethane suspension foam and strategic
sound deaden in doors.

Both are by Q45Tech

Q45Tech do you mind going into a bit more detail about this: Such how big of an improvement might be gained by doing this?, where to get the foam?, How to install it?

[Q45tech]

Weight and tire load index [pounds vs slip angle degrees] are the two most important, then comes camber angle under load which sets shape of contact patch.

Tire rack has an excellant story about lowering springs, swaybars, shocks, and tires about how the BMW improved by up to 3% in scientific tests.

Luckily the Q45 was near cutting edge with new oem parts. The rear 20mm [active bar] is not perfect but close enough considering rain. The T/active smaller 28mm front bar is 13% softer when paralleled with front springs reduces understeer by 5-6%.


The trick is to make sure that all rubber isolators in suspension are new or near new and alignment is EXACTLY at OEM midpoint even if extraordinary measures are required.


http://www.tirerack.com/suspension/test ... way_rd.jsp

http://zzyzxmotorsports.com/library/und ... deling.pdf

Chassis stiffness is like [front and rear] shock tower stiffnes both allow camber to go more positve under loads.

The camber [thus contact patch shape] has just one ideal for each degree of body roll for each individual tire.

Thinking static alignment is all there is, is foolish, just all the typical owner can have done. Better than doing nothing.