pros& cons to exhaust wrapping turbo manifold?

[flygt4]

i have my car in bits currently for a bit of maintenance. it occured to me that my exhaust manifold is pretty damn ugly, being made of steam pipe and with a few untidy welds,it kinda make the car looks slapped together(probly not helped by the legions of cable ties keeping everything in place ) and also pretty damn close to my radiator. im considering heat wrapping it all while its easy to get to.

is heat wrapping it going to improve temps around the back of radiator at all? is it actually useful for anything other than hiding ugly welds
is it going to have any adverse effect on the manifold/turbo etc?

oh use of car is , occasional street/drag racing, and light circuit racing up to 10lap sessions.

[postfach]

i dont know if there's any truth to this but i was told the exhaust wrap traps moisture in and the manifold will start to rust??

[l1ttle_d3vil]

i dont know if there's any truth to this but i was told the exhaust wrap traps moisture in and the manifold will start to rust??

wouldn't imagine that to be true, maybe if you hadn't run the engine for ages. but after running the engine for 30 mins i'd say the heat would get rid of any sort of moisture in there...

[flygt4]

i had heard that they can cause manifold to crack , even steam pipe ones. thats the main thing im concerned about.

[Dell'Orto]

Supposedly it increases thermal fatigue, but that'd have to be over a pretty decent length of time. You can get a HT silicon spray to keep it looking nice and water out too.
Pros of it are lower under bonnet temps, plus keeping the exhaust gas hotter which = faster travel = faster spool

[QikStarlie]

just dont wrap the down pipe

[Empr14]

I looked into this a while ago with my stainless manifold and was told no don't do it with a stainless one but with steampipe you should be fine,I've seen steampipe manifolds wrapped and on cars that get a regular thrasing and have no problems. Just makes sure you tidy up any burrs/sharp edges and welds before you wrap it as it'll be a bitch to unwrap later!

[Crucible]

I heatwrapped my manifold to try and keep underbonnet temps down a bit, being a trueno also with no grill there is bugger all airflow around my turbo.

Suppose retaining the heat in the manifold would be better for turbo spool, well in theory anyway. Cant imagine moisture being a problem as they get damn hot, I can see my manifold glowing at night through the wrap after hard driving. My mani is steampipe and no rust at all

I think the main advantage from using the stuff would be keeping underbonnet temps down, but really thats about it.

I used aluminium wire with a proper twisting tool to hold my wrap but c/v boot straps do a tidy job also

[flygt4]

hah i was gonna be a rangi and use hose clamps , spose it would be difficult tho. tie wire isnt hard to get hold of.

[NOLAW]

yeah at first i used hose clamps and it didnt look to bad but in the end i went with what True-No-Turbo used, can barly see them so looks tidy

[IH8TEC]

I heatwrapped my manifold to try and keep underbonnet temps down a bit, being a trueno also with no grill there is bugger all airflow around my turbo.

Suppose retaining the heat in the manifold would be better for turbo spool, well in theory anyway. Cant imagine moisture being a problem as they get damn hot, I can see my manifold glowing at night through the wrap after hard driving. My mani is steampipe and no rust at all

I think the main advantage from using the stuff would be keeping underbonnet temps down, but really thats about it.

I used aluminium wire with a proper twisting tool to hold my wrap but c/v boot straps do a tidy job also

your mani gets glowing hot after a hard run and your only on 9psi? whats your timing like man, i run 20psi, with 5deg initial, even when raping the thing it nevers gets red hot.

[slighty_looney]

i had heard that they can cause manifold to crack , even steam pipe ones. thats the main thing im concerned about.

Steel Steam pipe wouldnt crack it if it was wrapped, you'd have no problems at all, wrapping stanless is a no no

[Crucible]

i run 20psi, with 5deg initial, even when raping the thing it nevers gets red hot.

really???

Im actually running 10-11psi, the fuel check I had on the dyno was at 9psi. The guy couldnt hear any knock on base timing so I havent touched it. My manifold seems to be get quite hot and glow around merging pipe area not really around the piping itself.

My fuel is a little lean on the dyno sheet upto 8psi but after 9psi it goes way rich. Im aware it shouldnt really be getting "red" hot but my new ecu with a better fuel map will fix this Im sure...

[Crampy]

just dont wrap the down pipe

Why not the down pipe???

[flygt4]

hmm mine never glows at all both my gt4 and vr would light up the night sky after a bit of abuse

[QikStarlie]

just dont wrap the down pipe

Why not the down pipe???

because you want to get rid of the heat soon as it leaves the turbo. not hold it in. expanded hot air isnt what you want right after the turbo.

[method]

The difference your talking about is bugger all.

Heat wrapping your exhaust brings down the exhaust noise by upto 2db. thats a little more helpful especially if your just over 95dB or what ever it is.

[Stealer Of Souls]

For better heat rejection consider HPC coatings...

[flygt4]

considered it. cant be assed taking the manifold off ive virtually got the engine out as it is, dont want anymore shit to put back together

[QikStarlie]

The difference your talking about is bugger all.

Heat wrapping your exhaust brings down the exhaust noise by upto 2db. thats a little more helpful especially if your just over 95dB or what ever it is.

your effectively reducing the pipe size at the worst time tho. maybe if your drop pipe is an overkill to start with go for it. but the less pressure after the turbine wheel the better. maybe you wont gain much, but seems silly to pay money to loose power.

go put your soup in a thermos it'l stay hot all day. then tip it into a steel cup and it'l be cold within half an hour