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Location:
The Central Coast
Registered:
October 2002
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GZE interheater?
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Fri, 20 June 2003 01:30
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I'm running a AE92 GZE with a 159mm pulley making 11psi.
Standard top mount intercooler, runs more like an interheater, almost to the point of after going for a big stint, it gets so hot, you can't touch it. 
I've got aftermarket extractors with thinner tubing than original (obviously, because original, they're cast) and they seem to put out an enourmous amount of heat into the engine bay. It's my assumption that the heat from the extractors is going straight into the intercooler. 
Has anyone made up a heat sheild for underneath their intercooler? Is it worth thermal wrapping the extractors to carry the heat away from the enginebay? Maybe some sort heat sheild above the extractors? 
I know that front mount is the way to go, but I'm talking a CHEAP alternative to reducing the heat, as bugets are tight atmo.
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Registered:
April 2003
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Re: GZE interheater?
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Fri, 20 June 2003 01:51
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Just get some heat bandage and wrap the extractors, this way the heat will not excape and hopefully will get you more horses.
Another alternative would be to use air-con duct and wrap it under the cooler..
but front mounting will be the way to go.
What brand is your pulley? noticable difference from the stock one?
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Location:
The Central Coast
Registered:
October 2002
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Re: GZE interheater?
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Fri, 20 June 2003 02:06
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Pulley is a no-name cast item. Got it second hand.
Goes great compared to standard, real noticable extra pull from down low, runs out of oomph up top because of heat and the way the powerband of the GZE works.
Only drawback so far is the extra heat it creates, if you cruise around normally, everything runs sweet, bit of a squirt on the throttle and it's nice and fast.
Take it for a hot lap, and the longer you're pushing it for, the hotter it gets and the less power it seems to make.
What do you mean wrap air con duct under the cooler?
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Location:
Sydney
Registered:
April 2003
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Re: GZE interheater?
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Fri, 20 June 2003 02:20
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Sprocket
Extractors are definately the source of the heat and its heating up everything around it. It will help to get the heat wrap onto the extractors. But the best solution is to take the extractors off and send them to HPC to get them creamically coated.
Engine bay temperatures will drop definately.
Another suggestion is bonnet scoop to vent the hot air out.
Hope this helps.
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Location:
The Central Coast
Registered:
October 2002
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Re: GZE interheater?
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Fri, 20 June 2003 03:24
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Got one scoop for the intercooler atmo.
Another hole wouldn't hurt I guess, but that's a lot of stuffing around to make it cosmetically okay.
Ceramic coating sounds good, but still a little far out of my price range.
If you are absolutely certain that the extractors are the source of the new found underbonnet temperatures, then I may as well go back to the standard manifold. What do you think?
Also another thing to chew on, I could always turn the scoop round the other way to ensure that hot air didn't build up underneath the bonnet, and it was extracted from the scoop with aerodynamics creating a vacuum at the scoop to draw air out? 
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Location:
Sydney
Registered:
April 2003
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Re: GZE interheater?
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Fri, 20 June 2003 03:37
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I have seen that idea of swapping the bonnet scoop around but I have never had anyone mention the effectiveness of doing so.
Best thing is to get them ceramically coated ... I am pretty sure that this will solve the problem, it is definately a worthwhile investment. Next best thing is go take the extractors off and get put some high temperature exhaust wrap (e.g Thermotech).
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Location:
The Central Coast
Registered:
October 2002
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Re: GZE interheater?
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Fri, 20 June 2003 03:39
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I'll give it a go with the thermowrap, thanks mate 
I think I'll save up and front mount the darn thing after all.
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I supported Toymods
Location:
Perth
Registered:
May 2002
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Re: GZE interheater?
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Fri, 20 June 2003 03:40
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A good metal heat shield probably wouldn't go astray dude. Their effectiveness is good. How else do you think brake and clutch cylinders survive when they're sitting so close to turbochargers?
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Location:
Melbourne
Registered:
November 2002
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Re: GZE interheater?
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Fri, 20 June 2003 03:41
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The problem with turning the scoop around backwards is that if it is above your cooler then it will draw all that hot air through the cooler, so probably not such a good idea. 
The HPC or exhaust wrap does sound like a good idea though, although it is expensive.
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Location:
The Central Coast
Registered:
October 2002
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Location:
The Central Coast
Registered:
October 2002
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Re: GZE interheater?
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Fri, 20 June 2003 03:58
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So how have others dealt with heat soak on a top mount intercooler?
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Location:
Melbourne
Registered:
May 2002
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Re: GZE interheater?
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Sat, 21 June 2003 02:34
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Out of curiousity (and my own need to get rid of heat from the top mount), what sort of price is it to get both options done? The ceramic coating and the heat wrap????
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I supported Toymods
Location:
South of Wollongong
Registered:
May 2002
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Re: GZE interheater?
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Sat, 21 June 2003 03:00
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Did you notice much increase with the extractors over the stock setup?
i agree with u on the interheater. i have the nevo pully, and still top mount. sure does get hot after a bit of a fang. 
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Location:
was adelaide now newcastle
Registered:
February 2003
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Re: GZE interheater?
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Sat, 21 June 2003 03:01
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don't know about the price of ceramic coating, but my thermo tape cost about $70 for 50 ft covered my extractors very well (that is i decided to use more than i had to to use it all up).
cuts down heat really well, now after a run you can quickly touch the extractors and not get burnt. certainly worth it in my opinion, plus if your extractor are "ugly" covers this well too.
from what ive heard its best to ceramic coat brand new extractors, dont know if it can be done on used.
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Registered:
December 2002
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Re: GZE interheater?
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Sun, 22 June 2003 02:22
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I'm running top mount cooler on my gze aswell. Also got 164mm nevo pulley, getting about 10.5psi tops. I find with my bonnet scoop, after a fang i can touch the cooler and its not very hot at all. Maybe its just the cold Melbourne weather  But I also have genie extractors which deliver a lot of heat so I'm thinking of wrapping them aswell. But when I asked this on twincam16.com some ppl said the wrapping could crack my extractors
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Location:
North Sydney
Registered:
May 2002
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Re: GZE interheater?
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Sun, 22 June 2003 02:46
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I've done both on my intercooler pipe from the cooler to the throttle body. It's been ceramic coated inside and out and then I heat wrapped the pipe all the way up and down.
I data logged the temp before and after the changes and both combined are definitly the go. If you sit at the lights by the time the light goes green the intake temps usually rise by around 12deg, now only 2-4deg.
This temperature change would shift make a change in the air intake temp V's ignition timing map and timing would be retarded. This change could result in a decent (~10-15hp) loss at the wheels.
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I supported Toymods
Location:
South of Wollongong
Registered:
May 2002
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Re: GZE interheater?
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Sun, 22 June 2003 13:28
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I had a great nite driving tonight. first off, my car hit 12.5psi!!  MAX its ever got to!! used to just 11.
then later on, lined up next to my mates. one in a BA ford falcon, and another in a 3sgte 165gt4 i think it is (admitedly its not running quite the best), but i beat both of them
definately driving in this winter night air is much better than mid-day.
cheers
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Location:
The Central Coast
Registered:
October 2002
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Re: GZE interheater?
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Sun, 22 June 2003 23:04
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I didn't have the funds available for a roll of heat tape, so I just grabbed a chunk of galvanised sheet steel and wedged that above the extractors, and bent it over the top of the radiator. This effectively has stopped hot air from exiting the radiator, hitting the extractors, and travelling up towards the intercooler (it's also stopped the heat from rising off the extractors, which was my first aim) I went for a hard fang on Friday night and I couldn't get it to ping at all, so my assumption was correct, I was getting way too much hot air into the cooler.
I think a thermal heat wrap on the extractors is definately a way to go, and I also think it would not be a bad idea to make a heat sheild from the radiator to underneath the cooler, to even stop hot radiator air from flowing up the side of the block into the cooler.
I like SupraGT's idea of thermal wrapping the intercooler piping as well, it would definately help with heat soak into those pipes also. On the same note, I had a look at a 3SGTE water to air intercooler on the weekend, and it has some thermal insulation from the top of the block to the intercooler, and I think this is a really good idea to put ontop of the cam covers as well.
I think the aim of the game is to stop all that nasty hot air from getting anywhere near the intercooler and it's piping.
To answer St3ve_AE92, the extractors didn't seem to make a huge difference, for bang for your buck comparison, I'd rather just get a bigger pulley  The only drawback with a bigger pulley is the excess heat it creates. If you can't keep the intercooler insulated good enough, it retards the timing very quickly, and in extreeme cases (like mine) it will actually get too hot and bring on detonation.
Front mounting the intercooler is the ultimate answer, but I'd like to do a comparison of how the car feels after doing this to also see if it's worth the money, or whether just some time spent detailing some insulation around all the hot stuff would pay off better value for money or not.
[Updated on: Sun, 22 June 2003 23:05]
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Location:
Penrith
Registered:
July 2002
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Re: GZE interheater?
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Mon, 23 June 2003 10:06
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I have just been looking at the data logging from my 4agze on my buggy from oran pk on the weekend and there is no chance that the intercooler is getting hot from the exhaust or the radiator because its all out in the open and there is plenty of air flow around it, but with the top mounted intercooler my intake temp was around 120 degrees just from the heat radiated up from the motor. i have been told to move it and it would drop to about 30 degrees which means a big jump in horse power.
kevin
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Registered:
December 2002
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Re: GZE interheater?
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Mon, 23 June 2003 11:56
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I also want to put some sought of insulation between the top of the cam covers and the bottom of the cooler. What could be used for this? Wood? need something 8-11mm thick....
STeve AE92,
What gear did you reach 12.5psi in? I got 11.5psi max in 3rd the other night...it was freezing.
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I supported Toymods
Location:
South of Wollongong
Registered:
May 2002
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Re: GZE interheater?
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Tue, 24 June 2003 01:16
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| Seca Boy wrote on Mon, 23 June 2003 21:56 |
STeve AE92,
What gear did you reach 12.5psi in? I got 11.5psi max in 3rd the other night...it was freezing.
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3rd, going about 130km/h, then shift to 4th, same psi.
pretty sure im still getting ~12 too.. 
as i said, only ever used to just get above 11... weird..
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