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I supported Toymods
Location:
Brisbane, QLD
Registered:
May 2002
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Intercoolers and lag
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Sun, 15 December 2002 07:47
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Does anyone have anecdotal or analytical insight into the lag introduced by large intercoolers?
cheers
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Location:
Cabramatta, NSW
Registered:
May 2002
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 Re: Intercoolers and lag
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Sun, 15 December 2002 08:17
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You've increased the volume of air in your plumbing (ie: bigger intercooler) so the turbos have to push more air in there before you see the boost at the inlet manifold...
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I supported Toymods
Location:
Perth
Registered:
May 2002
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Re: Intercoolers and lag
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Sun, 15 December 2002 08:19
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Mind you, with good piping and a quality core, the restriction with a lot of bigger intercoolers is much less than that of many factory IC's.
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I supported Toymods
Location:
Brisbane, QLD
Registered:
May 2002
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Re: Intercoolers and lag
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Sun, 15 December 2002 08:37
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Well,
Couple of things really. Please feel free to correct me.
Firstly, what would be most important to me is the flow rate. See when people say the intercooler has 0.2psi drop, that doesn't mean shit. They can be trying to flow 25cfm@20psi and experience a 0.2psi drop or 15000cfm@15psi and experience a 0.2psi drop. What I would want in an intercooler is that it should support the flow I am interested in, at a lower restriction (and hence, psi drop) as possible.
This leads to the second issue. A larger intercooler would introduce a lag and the lag would be dependent on the turbo pressure, flow and the intercooler and piping volume, for the most part. How bad is this in real life? Any experience?
The other thing is the thermal efficiency. If its a tube an fin design, then more smaller tubes in the core is better than bigger tubes, even though the bigger tube core would flow better (due to the decreased wall area) but the thermal efficiency would suffer.
As far as I am concerned, I don't care about a 2 - 3 psi pressure drop across the intercooler at the flow rate I am interested in given it has a good thermal efficiency. Getting extra 2 - 3 psi off a turbo setup is much better imho than to have a shitty intercooler that doesn't work too well.
Do you guys know any place that would make a custom intercooler, if I was to give them the specifications I wanted?
Cheers
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Location:
North Sydney
Registered:
May 2002
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Re: Intercoolers and lag
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Sun, 15 December 2002 09:42
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Hey Humble,
I've just been going through all of this for my new intercooler. Spent past two weeks getting more info besides the obvious characteristics of a good intercooler setup.
As you know i'm running a high-flow T04E which some people say is quite laggy.
I've got 2.5 inch piping and was running two mx6 turbo cores welded together and had 225rwkw. I think it was very restictive around 4psi drop accross the core as is has very small runners being designed for a 2.2lt with 7psi.
The factory tank designs were very poor but it did the job. Now i'm getting a custom tube and fin intercooler with some large tanks. The tanks will greatly affect the final pressure drop and flow potential.
Unless your running a very large single turbo, you wont have any worries. Especially with 3lts of engine capacity as you do with your 2jz. The off boost performance is very nice thanks to this compared with smaller capacity turbo engines.
The cooling efficiency of bar and plate cores are about 30% better than an equivalent sized decent quality tube and fin core. Problem is, they dont flow as well.
For me this most important. More flow is more air in the engine, the more air added with more fuel the more power.
I'll PM you the details of the guy who is doing my new intercooler, he is fairly inexpensive and his tanks are really good.
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I supported Toymods
Location:
Brisbane, QLD
Registered:
May 2002
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Re: Intercoolers and lag
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Sun, 15 December 2002 09:45
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Thanks heaps Paul. Did you get your exhaust all sorted out now? I might have to get an exhaust done too...
Cheers
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I supported Toymods
Location:
Perth
Registered:
May 2002
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Re: Intercoolers and lag
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Sun, 15 December 2002 09:46
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So Paul, you're saying that a decent size tube and fin is the go, this is what i was thinking.
What dimensions are you going for, and if you don't mind, what is a rough estimate for what you're IC is going to cost you?
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Location:
North Sydney
Registered:
May 2002
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Re: Intercoolers and lag
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Sun, 15 December 2002 10:03
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No worries humble exhaust is done too, it's ok, not completely happy with it but it will have to do before i go a 3.5inch system.
Frank, yep a decent sized aftermarket core is your best go from my point of view. We did some measurments on saturday and i think we had a core that's 380mm tall by about 550mm wide and 3inch thick. This is with some good tanks and the piping coming into the cooler from the driver side and leaving passenger up to the throttle body. Not doubling back as the factory setup usually goes and adding at least 500mm of un-necesary piping for the turbo to pressurise before i come on boost.
The piping i have managed to rescue most of it from my orginal car. I made it out of 2.5inch mild steel with mandrel bends and welded it together. Cost me about $90 in just steel from Liverpool exhausts about 2 years ago. I then got it all cermaic coated inside and out over the lot for about $120.
The IC will be $1000, i gotta remove the front of the car etc to help and have all the ic piping in place to make it easier.
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I supported Toymods
Location:
Perth
Registered:
May 2002
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Re: Intercoolers and lag
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Sun, 15 December 2002 10:06
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Nice dude,
thanks for the info. I'll look into it for what I want to achieve 
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