I've found industrial-quality heat wrap for the turbo, and it costs a bit over £100.
It might work fine, reducing lag and also reducing radiated heat in the bay.
What I don't know is how much the exhaust manifold will expand beyond the designer's limits. It could easily damage the heat if it were to warp.
yes thats what I'm thinking but I was thinking that if you gunned a turbo for long-enufe then the manifolm would get just as hot, after heating the whole engin bay then theres noware left for the heat to radiate to. OK OK so you have convecion curents out of vents ect and condution curents through the bodywork, but on a hot day the manifolds guna get more than warm anyway, so it would be stupid to make a manifold that would crack at the temp of the combustion gasses. so I ask you do you think that Vauxhall are that stupid??? after hearing about the astra bulkheads I'm not so shure?
P.S. I have NO experiance with quick turbo engins so I'm just thinking out loud realy, so if I'm wrong then tell me. Has anyone herd about manifolds cracking throught ecsesive tempratures?
Exhaust wraps reduce the underbonnet temps. That's a fact.
Now, where does this heat go, if not in the engine bay?
Not rocket science, innit?
For the record, racing teams (n/a cars) have used exhaust wraps in the past, and they have experienced cracked manifolds.
...or manifolds that were taken off and would never go back again because they were half an inch off. Ouch.
Just food for thought - maybe there's a half way house for turbos...
exactly - I was loath to wrap the whole manifold I've just put on for that exact reason - so I've just done the bit that sits directly under the back of the engine, where the rising heat would get sucked into the intakes when standing still - the whole thing was sprayed though to keep the rust at bay, primaries are unlagged to moderate the heat build up gradient - the exact thing that causes damage.
Originally posted by ChrisB True, but I meant most of the heat is transfered down the pipe.
More heat down the pipe, means higher pipe temp down the line, which means *even more* heat up the line.
The temp of the manifold will go up - there's no way around this, except if you go for ceramic coatings (inside and/or outside)
Stainless steel manifolds tend to resist cracking.