F430 exhaust bracket question

Glen,

Yes, the lower side brackets go the same way as the bow spring and all the other exhaust bracketry: into that box of OEM parts that go with the car when you sell it. The only thing supporting the exhaust system, then, are the Capristo brackets and the headers.

Tom
2007 F430F1 Coupé (Izzy)

 

Glen,

I see what you are saying.

I think that removing the lower mounts would help (they come out when using the Capristo mounts) since it would eliminate some of the restriction placed on the exhaust system by the OEM mounting scheme. Still, I wonder why they would put the lower mounts in place if the overall situation would be better without them. Of course, I also wonder why they would use the mounting scheme they do, given that it causes damage to the headers as well as the lower mounts.

If you’ve ever had the bow spring out, you will note how stiff (almost rigid) it is. As stated elsewhere: for every action, there is an equal but opposite RE-action. The 430 exhaust system lengthens about a centimeter at full operating temperature. This expansion has to go somewhere. The more rigid the bow spring is the more force (the RE-action) is put onto the header runners. Since the headers, especially the flanges and runners get very hot, their failure threshold is correspondingly reduced. Add to all this the repeated heating and cooling cycles, which causes a fatigue loading, and it’s a wonder that the headers last as long as they do.

The Capristo mounts are the only ones that offer very little restriction along the principle expansion axis, fore-aft, while offering sufficient support in the vertical direction. That is why, as both a mechanical engineer and a 430 owner I strongly advocate using the Capristo mount.

Tom
2007 F430F1 Coupé (Izzy)

 

The problem w the stock bow spring is that its mounted to the transmission which vibrates at a different frequency than your exhaust system. Combine with the fact that it allows no verticle movement.

 

don't people say you shldnt use the capristo brackets with oem exhaust? something regarding theyre too stiff and you shld only use them with a capristo exhaust?

 

Debate is out on that but I've replaced both sides of stock brackets twice. There won't be a third time. Capristo going on now. Mine is the shop now.

 

Awesome you have know-how and capabilities to repair. My dad and brother could probably fabricate something as well. I am the mechanically challenged one. Also blessed with zero patience.

 

Not sure about the Capristo brackets/remainder OEM scheme being bad. That's what I have now, although I have Fabspeed headers/Novitec cats/Novitec muffler and tips waiting to go in. My Capristo brackets/remainder OEM set up seems OK except for a wotta-wotta sound that developes after the car has run for more than 30 minutes.

Tom
2007 F430F1 Coupé (Izzy)

 

Good point as the Capristo brackets are supported from the rear steel chassis crossmember not the gearbox

 

Ok maybe I'm wrong - I cld have sworn I've read that you shldnt use the capristo brackets with the oem exhaust. that being said I didn't understand the reasoning behind it other than that the brackets are too rigid.

 

The Capristo brackets are indeed designed to be used with the original exhaust to circumvent the cracked header issue Coupe : Ferrari 430 Bracket Kit for OEM muffler

 

If you have the Capristo brackets you will see that the exhaust does move up to almost an inch on a long journey when it gets truly hot and expands, I don't think the engine and gearbox moves that much.

 

yes certainly 2 cm (Inch = 2,54cm) length ways towards the rear, thats why the headers crack its not just that they are a suboptimal design, it does seem as though Capristo have put up their prices, I recall paying something like $200 less

 

I agree. Being mounted to the gearbox, which mounted solid to the engine means the exhaust moves with the engine and trans as one unit. When it is mounted to the chassis, it will be different since the engine mount isolate the engine to the chassis thus the engine and the chassis move differently.

 

that's all very well but its the problem in itself in that the engine and gearbox doesn't move 2 cm when hot. Starting to question the Capristo method is pretty dumb as hundreds of people have proven it works, whether its the best solution or too expensive is another matter

 

Glen

Did you get anywhere with this. Any instructions or photos?
I am in Australia and same rules apply. Far too expensive for what is provided so was considering how to make my own.

Tezza

 

I made my own system. I'm testing it out over the summer period and will report back.
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