T78 Heat Shield????

[gsb876]

Hi Guys,

Does the heat shield for the t78 turbo provide adequate results for the outlay???

Is it a mod to deffo have anyone here got a heatshield, if so have you noticed lowered engine temps???

Thought i\'d ask before starting a search for one like???

Gurj:wave

[jetpilot]

Will be watching this thread with interest, as i think i have the same problem, loads of heat soak.
You can buy heat resistent jackets for turbo\'s from the likes of Demon Tweeks, anybody used them at all?

[wiggy]

I HIGHLY recommend the Nimbus/Cirrus heat sheild material Demon tweeks sell, its excellent at taking temps away from tubos. Its quite expensive if you buy the good stuff but, IT WORKS

Better than any shiny bit of metal plate ever will thats for sure. You can shape it into any size etc you want. I used to use 2 GT4 double wall steel heat shields as moulds and sandwich this stuff between, once done I had a perfect replica of the GT4 heat shield in a much better material Ideal as my front mount pipes used to travel over the turbo

Regards

[gsb876]

I have a "demon tweeks" mag somewhere will check it out to see what we can see, thanks for the info:)

[wiggy]

Gurj, Page 227 of the bible...I mean the motorsport cat

[gsb876]

Cheers:)

Only asked about the heat shield as on the american forum lots of mention of one on the larger turbos t78 / t88 / t51r , so thought i\'d check out what we can get here;)

//www.rx7club.com

Above is the amercian forum if one wishes to view:rolleyes:

Gurj:wave

[wiggy]

I personally believe ALL turbos should be covered to prevent heat soak in the engine bay.

I\'m supprised that not many people who own RX7\'s don\'t take this into account? I mean having the air filters smack bang in front of the turbos....whats that all about? I ended up making a Carbon Fibre cold air box for the 4 and it worked wonders for intake temps. I used to have an intake temp gauge plumbed into the plenum and just adding the cold air box made a massive difference. On a car like the rex that suffers badly by heat and Det destroying engines I\'m supprised you all don\'t do everything possiblt to reduce temps everywhere.

I know a nice phat front mount will cool the air anyway but if its cooling hot air it might only be warm when it leaves the intercooler. If your cooling warm air though, you have nice dense cold air heading into the engine And as we all know, cold air = more power and less chance of det.

Thats my theory anyway and what I plan to do

[MillSpeed]

Here\'s what I\'d like to do if I had the $$ and time:
In my opinion a big single is the only way to go. Carefully studying the turbo maps and selecting a turbo that is working at maximum efficiency under the conditions you\'ll be subjecting it too most often will mean the charge exiting the turbo will be cooler to begin with. Use a tubular stainless steel manifold and heat wrap it, along with the down pipe and get a glove for the turbine housing. The aim is to keep all that thermal energy inside the pipes and spinning that big ol\' turbine (and not seeping into your engine bay!). Lose the cat too and run a straight thru pipe, BRAP BRAP....CHAINSAW POWER!!!
Losing those twins will help the engine run cooler for two reasons:

1. the huge glowing "fire brick" of a manifold will be gone, something that big which gets that hot bolted to the side of the engine cannot be condusive to cool running!

2. the rats nest will also be gone. I\'m sure all those pipes, wires and solenoids shoe-horned under the intake manifold act as a nice insulator. I also recon it\'d be a good idea to relocate the coil packs to an ancillary position, keeping them cooler can only be a good thing.

So that\'s the hot part taken care of. Next I\'ll be using the monster PWR charge cooler I\'ve got left over from a doomed project to chill the charge and ditching that bastard micro inter-heater. Using a charge cooler mounted inside the engine bay will allow me to have two short pipes running from the turbo and too the throttle body, keeping the overall volume of the pipework to a minimum. Of course the chargecooler, pipes and inlet manifold will all be heat wrapped and coated in foil to try and prevent them getting heatsoaked. While I\'m at it, the coolant supply to the throttle body will also be eliminated.

What next? A nice big Koyo or fluidyne rad filled with evans NPG+ waterless coolant (which can be mounted in an almost upright position due to the absence of the interheater) with a big pair of K&N fans. Infront of that will be a large heat exchanger for the chargecooler and all this will be incased in aluminium ducting to make sure that all of the air that enters the front of the car actually goes through the rads. Some ducting for the uprated oil coolers wouldn\'t go amiss either. It would also be a good idea to relocate the battery to the boot, so that there is nothing behind the rad that could prevent air from flowing through it easily. A vented bonnet could also help, but I\'ve never been keen on the look of them.

Finally, an aquamist water injection system, which could run off the same reservoir as the chargecooler, would further reduce the chance of detonation.

One day folks, one day.