xplosive

I took off my exhaust to install a downpipe and walla! found out I had a trust exhaust.. anyone know about them? also seen I had the RE rad in the bronze finish!

4CN A1R

iTrader: (6)

i believe "trust" is greddy spec and also most of the time titanium

str8ryd

iTrader: (473)

LoL...same thing happened to me. I just thought the whole time I had a nice sounding exhaust and when I removed it to replace it, I decided to polish and found out it was a "Trust" exhaust. These are honestly one of the nicest FD exhausts on the market IMO. Look really good and sound awesome.

SLOASFK

iTrader: (5)

Yep, Trust is Greddy.

sevensix

iTrader: (1)

they make ss and ti exhausts..

the radiator is probably the copper one? i think aluminum is superior to copper as far as heat conduction and weight but copper is better vs corrosion. or do i have my info mixed up.

Doc-1

iTrader: (2)

Not true copper is king as far as heat exchanger goes. Gold is better but it get to a cost issue

SLOASFK

iTrader: (5)

Yep, copper's a better heat exchanger, but it's heavier.

R33Skyline

i have a trust that came on my FD and the **** has holes rusted in it. by no means is is SS or Ti

rxseven93

iTrader: (1)

Its also way more expensive.

sevensix

iTrader: (1)

thanks for correcting me . + looks like silver is tops

FC3S_nataku

iTrader: (3)

anyone have a sound clip of a trust cb or pics?

4CN A1R

iTrader: (6)

yes.

especially now, since copper just jumped up in price again. its getting to the point now that scrapping old copper yields more money then what it used to cost like 5+ years ago

Uncle Hungry

iTrader: (2)

Trust is nothing special, just what Greddy calls themselves in Japan. Kinda like a Honda Legend and an Acura RL. Although I did have a Trust dd duel on my 240 that was certified bad ***.

dgeesaman

iTrader: (7)

What's more important IMHO is the total thermal performance of the radiator divided by the weight in lb. Copper isn't just more expensive, it's heavier. And the fact that it's right in front of the car reinforces the fact that the weight is part of the equation. It's a nice chart though for common materials. (It excludes uncommon materials not used in cars)

People bang on the stock FD radiator, but metal end tanks are heavy and they don't add much if anything to the heat shedding capability.

What would be interesting is an aluminum-end-tank radiator with copper fins brazed together with some equally conductive filler metal.

Dave

Tom93R1

iTrader: (2)

I should think weight of a Cu radiator would be a non-issue since its thermal conductivity is nearly double that of Al. A whole copper radiator couldnt be more than a couple pounds heavier than aluminum which could easily be made up by making it smaller and maintaining the same cooling capacity.

The problem with copper is it corrodes, after a couple years you would have a green radiator that leaks and doesnt conduct heat worth a damn. This is why in stereo equipment they gold plate the RCA cable ends even though gold isnt as electrically conductive as copper.

DaveW

That's true, but the hard part of transferring heat from the coolant to the air is getting the heat from the radiator fins to the air, since air is a poor heat conductor - air thermal conductivity is orders of magnitude less than that of either aluminum or copper. Getting water heat to the fins is much less of a problem.

Therefore, fin design and area are much more critical factors than whether the tubes and fins are AL or Cu.

See this thread for an example:
https://www.rx7club.com/showthread.p...=radiatorworld

Dave

Sgtblue

iTrader: (16)

FWIW, I've got an older Greddy SP and the muffler is stamped "TRUST" on the bottom.

Sure it's copper? I'm thinking it's more likely brass...at least the tanks.

Marshall

So why do they call it a radiator if it conducts engine coolant heat to the fins and then convects it into the airstream???

BobfisH

err, because it radiates the heat stored in it?

Marshall

only kidding, its a trick question automotive engine coolant heat exchangers do very little radiation, just an old misuse of the terminology that propagated through the years.

j9fd3s

iTrader: (3)

yeah, the older trust stuff has got to be mild steel.