I've heard of people wrapping the down pipe. But I was wondering if anyone has covered up the exhaust part of the twins in heat insulating material to slow down boost lag and make some more power? I was contimplating making a custom heat shield for the twins but my only worries are over heating the oil in them and causing them to crack.....

 

It won't make more power.

The stock twins should have a bunch of heat shields, isnt' that enough?

Dave

 

The exhaust portion of the stock twins already generates (and retains) a ton of heat. You won't reduce any boost lag by trying to retain any more heat (besides, with the stock twins, there's hardly any); the exhaust turbines are already positioned in the ideal spot for performance, right outside the exhaust port.

 

right well my stock plates are all gone....they were never there to begin with...wouldn't it reduce under hood temps to cover the downpie and exhuast part of the turbos though?

 

Wrap that down pipe in fiberglass! Keeps the heat off the engine. I did it to mine and it was well worth the 30 bucks I sunk into it. It didn't take long, either.

 

You can cover the downpipe, but attempting to cover the exhaust turbine housing will be difficult at best, and the heat retention will cause premature cracking of the cast iron exhaust manifold.

The concept behind wrapping/coating the DP is to keep the exhaust gas velocity high; simply getting rid of the pre-cat does the majority of underhood temp reduction.

 

Yeah thats what I was worried about....the crackin of the turbos....

 

I sent my stock turbo heat shields to be ceramic coated along with the bonez DP. They look great but I can't really tell any temp difference.

 

That's what I did. I picked up some asbestos wrap and 3" worm gear clamps for less than $40.

 

I covered my turbines and primaries in cooperknit, which is a thick (~0.5") knitted fiberglas mat. It drastically reduced the radiant heat in the area and dropped the average intake air temp about 10 degC, and keeps the oil drains nice and cool.

 

so what does the mp repalce...the precat or is it part of the dp..and do u need an ecu upgrade? just curiousl.

 

The MP replaces the CAT. The DP replaces the precat. It is advised to get an upgraded ECU when performing this mod to help with the boost spike and creep that will occur

 

so do if i get new dp..do i have to get mp as well..and do i need an ecu with just dp..?
(think im overthinking your reply sorryf)

 

You can remove the precat and put in a downpipe without worrying much about it. If you've already got an aftermarket intake and muffler, you'll about be at the limit of the stock ECU.

It's replacing the main cat with a midpipe that introduces boost questions. I dont' recommend that for several reasons, one of which is passing smog.

Dave

 

A friend of mine made a turbo blanket out of pipe wrap, it lays over the turbo and blocks heat from the lim, and Y-pipe as well as reducing overall temps under the hood. So far as i know there's no ill effect from doing this as far as excess heat in the turbo's or more heating of the oil in the oil lines. I greatly reduced the under hood temperatures and the amount of time it takes for the under hood temperatures to drop. Jack

 

I'm not sure that people realize that getting a downpipe coated is not all that expensive. I got mine JetHot 2000 coated for $75. Other lower temperature coatings are even cheaper. Even with $30 or for shipping it is still only $50 or so more expensive than wrapping material and t-bolts.

It is also a lot less effort, coats both the inside and the outside of the downpipe so is presumably much more effective at getting heat out of the engine bay, and you will probably get your $50 back when you sell the downpipe.

 

I have my DP coated with jethot2000 and also wrapped with thermotec

 

^^just to be sure i get this right.....i already have aftermarket intake...so installing a dp and catback would be about all i can do on the stock ecu. and i presume the next step would be to investet in upgraded/piggyback ecu or the apexi ecu thingy??
iknow the q's r rather cumbersome but believe me..im theonly one in my little circle with a clue about this car.. and that aint very much either. so...yea..either way u guys r awsome and i appreicat the help and support.

 

You should be fine assuming you can keep the boost at 10 psi. The problem with a mid pipe is that most people experience large boost spikes after installing one. You should be fine installing a dp and cat back, although make sure you have a boost gauge first. When I bought my car it was completly stock other than a cat back exhaust, installing a dp caused large enough boost spikes to hit the fuel cut nearly everytime I floored it in 4th gear. I removed the pill from the wastegate line and that temporarly solved my boost problem until I could get a boost controller.

 

SWEETNESS TURBO AND DP WRAPPING IT IS....does anyone wrap thier MP to keep up the velocity of the gas?

 

Does the fiberglass turn black, harden or stick(glue) to the downpipe?

 

^^ thanx bee...ill go with the dp and a boost controller then...

 

What kind of fiber glass sheets and resin did you use when wrappign your Downpipes and turbos? I was also curiose if you guys saw any burning or slightl smokign from doing this? Is it possible for some of you guys to post pics of this?

 

Resin will burn at those temperatures. The stuff that I bought looked like a 2"-wide strap. I wrapped the DP like a tennis racquet grip and used three 3" stainless steel worm clamps to hold it there.

Just be careful when using fiberglass. Don't get it in your eyes and wash your hands THOROUGHLY after using it. Also, don't touch yourself in any way. If you have an itch, use a screwdriver or something.

 

had my dp wrapped so im good to go