Havent changed bushings or anything yet. Ill have to check cause im not sure if its allowed in my class either. I did talk to JC about mounting a brace between the crash bar mounts behind the intercooler. He seems to think it should be fine without the crash bar since he runs 1400hp cars without them and they dont seem to be splitting in half, but he said he would do whatever I want him to, I'm not really that worried about it though. On the street I dont really ever drive that crazy and on the track, wrecking the car with or without a crash bar wont make much difference as far as saving the car when your going 100+mph. I dont understand why everyone seems to think the crash bar is meant to hold the car together. If that was the case I imagine it would be a hell of lot thicker/stronger material.
The TR8 is too small for my HP goals. Later on im looking to swap turbos and see how far I can really push this setup.
Last edited by Dowski12; 05-11-2012 at 07:22 PM.
- Jack one of the front tires off the ground and check the door alignment/gap
- Put the car on a lift and look or measure the front end sagging from its own weight (no loads).
- Tie the two shock towers with a string (there can be a little slack) and go for a few spirited turns in both directions. The fifth spring/flex will take care of over extending the string with ease, even with the little slack, it will be broken after a few spirited turns.
To answer your question about bracing, I can't triangulate anything in my class but I've tied 2 single points in a few locations to help the chassis. Remember, I already have the second most rigid frame in the line up (3.2 coupe being the most rigid) and Audi already gave me a lot more to work with because of the additional factory frame bracing and OEM solid frame mounts . It may not mean much to the OP, and having extra dynamic toe, camber, and caster movement maybe low in the priority list but it's there (especially when you drop 75% of what tied the rail on the steering end together).
Not sure about the 3.2, but the convertible has additional subframe bracing to make up for the reduced torsional rigidity due to losing the roof. I think even with uprated mounts, you can't count on much reinforcing from the engine & tranny.How is the 3.2 coupe more rigid than a 1.8 coupe though, other than the engine and giant DSG? Is the subframe different? I wasn't aware of any differences other than the rear floor pan. What are OEM solid frame mounts you mention? Educate me please.
Also, if you keep your FMIC setup like the pictures, you might want to add a little flexibility to the mounting; otherwise you could end up trying to use the FMIC as a brace, which would likely crack at some point.
You guessed it right, the 3.2 is the only coupe with the Roadster subframe. The roadster subframe reinforced the front end by 30% to make up for the 15% lost over the coupes. The Rodster frame mounts are also solid two pieces items (delrin I believe). All the Mk4 golf guys that road race upgrade to TT roadster frame mounts and replicate the extra bracing of the roadster subframe. According to them it totally transform their cars and can see it having the same effect on a regular coupe also (no exaggeration when I warn against removing even more front end rigidity by removing the cross pipe and crash bar).
Roadster/3.2 subframe where you can see the OEM bracing and solid mounts
Cross bar that I added to improve on the extra OEM roadster bracing
Well I guess I know what I'm doing after my build is done. Im ordering my coilovers and brembos next month so I guess Ill be getting a roadster subframe at the same time. Thanks for the info. I wasen't aware there was any difference in subframe design.
Marcus, is the roadster subframe a direct fit or is there any modification involve?
As far as my intercooler mounts, the metal stock we used flexs pretty good. JC said that the mounts would have to be able to flex for the same reason you mentioned so hopefully I should be good there.
Last edited by Dowski12; 05-10-2012 at 02:22 PM.
Ok, I got plenty of extra rubber grommets so Im sure I have some that will work. Thanks for the help. There is a guy selling his subframe and control arms from his 05 3.2 for $325 shipped. My question is, do I need his control arms or can I just get the subframe and use my own? Also is there any benefit to swapping to his control arms? And finally is this a good price for everything?
I agree, would be smarter but theres no turning back now Definitely gonna add some support though to make the car more rigid at least. Buying a 3.2L subframe from a guy on here, hes sending it on friday so that will help. JC is going to weld a support between the crash bar mounts too, probably out of some nice thick round stock he has at the shop. It wont do much to save the intercooler but hopefully it will help protect everything behind.