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Old 09-11-2003, 08:38 PM   #1
Scooby Specialist
Member#: 37731
Join Date: Jun 2003
Default ideas...maybe some will inspire you?

after finding a good deal on a fairly nice header (gruppe-s v2), ive decided to go the "do it right" route, and get it jet-hot coated. with this in mind, here are some other ideas i think i will implement in my car.......

bought a godspeed uppipe (used), but am sending that in with the header to get them coated with jet-hot 2000.

at a later date (after i buy a pe1820f) i will send the pe1820f to deadbolt to get it port and polished.

after i receive that back, i will send the turbo to get jet-hot 2000 coated on the outside...along with my godspeed downpipe to get the same coating.

now since i dont have a stainless steel exhaust (GReddy EVO), i will at that time also send the greddy in to get jet-hot sterling coated. chicago winters are harsh. so much salt on the roads- exhausts go in no time if youre not careful. this way, with the whole exhaust coated, it will be rust-proof.

also, since at this point, the entire exhaust will be coated, it should move the air more freely, while keeping in almost all of the heat in. my car as is, is like an oven under the hood. with this, im thinking it shouldnt be so bad. the gases should theoretically flow better, and thus spool the turbo quicker, and since the turbo will also be ported and polished, that bad boy should spool really well.

one downside i can come up with- will this make the air coming out of the turbo hotter? ideally, i will live with the performance hit and get the turboxs tmic. i dont mind the 20whp loss, if i dont have to remount the battery, cut the bumper, remove the crash beam, get a new filter, blahblahblah. BUT since the turbo would be coated, and keeping more heat in, would it affect the cool side of the turbo enough to dramatically increase temps? part of the reason to coat everything would be to lower underhood temps, and hopefully get a cooler intake temp (short ram). maybe it would just balance out to no benefit. haha.

sorry its so long, but these were some things i was thinking about on the way home from work today . lemme know what you think!!
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Old 09-12-2003, 12:47 PM   #2
Scooby Newbie
Member#: 37205
Join Date: May 2003
Chapter/Region: RMIC
Location: Colorado
2004 STI


Theoretically, if you increase the temperature going into the turbine, you will decrease the temperature coming out of it, or see no change in outlet temperature. The turbine efficiency would increase, since inlet temperature is the most important factor in turbine efficiency.

I would be more concerned about the possibility that the Subaru engineers rely on the heat transfer out of the turbo body to both keep the compressor outlet charge cooler, as well as the bearing. If you coat the turbo itself, you may risk overheating it

Insulating the turbo back exhaust will improve scavenging, but it will also increase the likelihood of having a flow restriction at high rpm. If you get a big enough exhaust, it shouldn't be a problem.

Coating the exhaust probably won't have much of an effect on under hood temperatures, since the IC and intake are mostly responsible for that, mostly. Coating anything on the compressor side will hurt your performance, since your goal is to lose as much heat from the system as possible.

Overall, though you may like the look of the coating, the benefits will likely be unnoticeable.

Port and polish, plus the other aftermarket parts are definitely inspirational.
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Old 09-12-2003, 03:14 PM   #3
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Member#: 37731
Join Date: Jun 2003

hmm, ok...ill just ask to get the hot side of the turbo coated.

i already have the godspeed downpipe and greddy evo exhaust installed.....its going to suck when i have to put the stock one back on while its getting coated. lol, oh well.
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Old 09-12-2003, 03:22 PM   #4
Scooby Specialist
Member#: 40189
Join Date: Jul 2003
Location: Portland, Oregon
2004 STi


You probably won't see any big changes in any of the exhaust temp. Not a bad mod to do, just some what over rated in my opinion. It will not be "rust proof". It will be more corrosion resistent but it will eventually rust through.
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Old 09-12-2003, 03:45 PM   #5
Scooby Newbie
Member#: 26529
Join Date: Oct 2002
Location: STU
04 STi


from what I've seen, the Greddy EVO exhausts are usually rust through from inside out, so the coating may not be very helpful...
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