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Location:
Mackay QLD
Registered:
November 2002
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 intercool
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Fri, 03 January 2003 20:30
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I am currently not running an intercooler with my 4age turbo. My question is what difference do you think I should expect by ading an intercooler even if it only be a 4agze one 
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Location:
Coffs
Registered:
May 2002
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Re: intercool
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Fri, 03 January 2003 23:04
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What turbo are you using??
Did you turbo a 4AGZE??
Have you done any internal work??
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Registered:
May 2002
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Re: intercool
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Sat, 04 January 2003 11:25
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I would say an intercooler would make your engine last alot longer unless you are using methanol!!
Even the little gze one would make a diference
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Location:
Mackay QLD
Registered:
November 2002
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Re: intercool
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Sat, 04 January 2003 12:54
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It is just a 4age with a ct20 turbo.I already run water methanol.I put the 4agze intercooler on went for a run.The intercooler robbed between 3 to 4 pounds. I came home and adjusted that.Took it for another burn. It feels like the mid to topend pull has increased a bit but I was never expecting much performance wise. It definately keeps it heaps cooler.
After a few good power runs the intake manifold is still good to touch before there was no chance.
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Location:
Sydney
Registered:
May 2002
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Re: intercool
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Sat, 04 January 2003 23:42
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i'd say a good response to your question would be as you've discovered you'll get some restriction in boost (the has to be forced through the cooler now) dont expect to many power gain but expect less power degredation.....
try a bigger coola i might put my chaser one up for sale soon keep an eye out or pm me
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Location:
Southern Sydney
Registered:
August 2002
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Re: intercool
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Sun, 05 January 2003 13:41
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I think as been said, an intercooler will not increase performance by itself.
It will howerver make room for further mods or higher boost levels.
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Location:
Brisbane
Registered:
May 2002
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Re: intercool
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Mon, 06 January 2003 00:51
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As a matter of fact, a good intercooler can increase performance by itself simply because it makes the inlet charge denser. Higher density = more oxygen = more power! In some cases you may have to tune the engine to take advantage of this (eg more ignition advance), but generally speaking you will get at least some extra power simply by installing an intercooler.
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Location:
Southern Sydney
Registered:
August 2002
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Re: intercool
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Mon, 06 January 2003 02:32
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Wow.... didn't know that.
Thats a good excuse for me to buy that Front Mount.
How exactly does it make the inlet charge denser? I thought they were basically a cooling device only.
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Location:
Parramatta
Registered:
July 2002
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Re: intercool
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Mon, 06 January 2003 02:56
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its denser because there is more air flow the more it can put through the inlet the denser it becomes think about it a larger pipe fits more then a smaller one, so therefore bigger is better to a degree. to big = turbo lag. anyways thats another story
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Location:
Parramatta
Registered:
July 2002
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Re: intercool
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Mon, 06 January 2003 03:01
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and also it becomes desnser because the i/c will reduce the temp. think about it like this when u have a cup of water what happens when its heated its steam then u put it in a frigde or frezer it becomes ice therefore its denser then steam. just a thought! have fun hope this helps
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Location:
Sydney
Registered:
May 2002
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Re: intercool
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Mon, 06 January 2003 04:05
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yeah...thats true depending on wether ect ect... which being in oz 99.9 % of the time you'll make gains
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Toymods Board Member
I supported Toymods
Location:
Turramurra, Sydney.
Registered:
May 2002
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Location:
South Australia
Registered:
July 2002
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Re: intercool
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Mon, 06 January 2003 07:21
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When air is colder it also has less of a tendency to pre-detonate, meaning you can advance the timing a bit more which is good for power (to an extent).
You could probably run a hell of a lot higher boost pressure too if you wanted to.
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Location:
Brisbane
Registered:
May 2002
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Re: intercool
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Mon, 06 January 2003 07:34
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Correct. Intercooling will also increase the life of your engine, so it's just a good idea no matter which way you look at it! Considering how cheap OEM coolers are these days, there's no reason not to do it.
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Location:
Mackay QLD
Registered:
November 2002
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Re: intercool
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Mon, 06 January 2003 10:48
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Well now that I am running the intercooler. Is there any advantage or disadvantage in disconnecting the water methanol injection?
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Location:
Brisbane
Registered:
May 2002
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Re: intercool
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Mon, 06 January 2003 12:52
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If it's there, you might as well leave it. Water injection will cool the inlet charge even further than the intercooler alone can, as as we have already established a cool inlet charge is a good thing. 
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Location:
Sydney
Registered:
May 2002
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Re: intercool
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Mon, 06 January 2003 23:05
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| BigWorm wrote on Mon, 06 January 2003 16:50 |
The colder air is the more dense it is, ie there is more air in a given volume. Therefore there is more oxygen in the given volume (the volume will end up being one of your cylinders), which means more fuel can be added, and then when you light it it will make a bigger bang & you will have more power.
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this is a great exlaination of wots happening
more about water injection though i'll start a new thred
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Location:
Mackay QLD
Registered:
November 2002
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Re: intercool
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Tue, 07 January 2003 00:28
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Does this mean that now that the air is more dense that I need to richen the mixture up?
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Location:
South Australia
Registered:
July 2002
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Re: intercool
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Tue, 07 January 2003 04:59
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Yeah the mixture would be slightly leaner now so you'd have to enrich it to get it back to a decent ratio.
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Location:
Brisbane
Registered:
May 2002
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Re: intercool
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Tue, 07 January 2003 05:33
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Actually it depends how the air is metered by your engine. If it uses a MAF sensor (mass airflow), no re-tuning is required because the ECU knows what mass of air is being consumed, regardless of density. If it's using a flapper-type airflow meter it's a different story, as these can only measure the volume of air going past, not the mass.
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Location:
South Australia
Registered:
July 2002
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Re: intercool
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Tue, 07 January 2003 05:38
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Stock 4A-GE engines (at least 1st gen) use a air volume meter, not mass - same as 1st gen 3S-GE.
I dunno about the later 4A-GEs though (100kW 4A-GE, 20v etc etc)
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Location:
Mackay QLD
Registered:
November 2002
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Re: intercool
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Tue, 07 January 2003 05:39
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Maf how cool is that  It seems to be running sweet as , probably the best it eva has.
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Location:
Madrid - Spain
Registered:
August 2002
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Re: intercool
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Wed, 08 January 2003 12:18
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If you want to know exactly how much effect an intercooler makes, do the maths. The difference in density directly proportional to the temperature ratio.
For a turbo/supercharged car, use the following equation.
Pressure Difference = (inlet air temp/outlet air temp)*pressure ratio.
Note that temp is in Kelvin, Kelvin = Celsius + 273
in your case, measure the inlet temp after the turbo, and divide by the outside air temp. My guess is that at say 0.5bar (7psi) boost (pressure ratio = 1.5), you will have an inlet temp say 80 degrees greater than ambient.
Density difference = (298/(298+80))*1.5 = 1.2
= 1.2 times non turbo density.
If you put on an intercooler that knocks off say 50 degrees, the difference equals
Density difference = (298/(298+30))*1.5 = 1.3
= 1.3 times non turbo density.
theoretically if your 4age puts out 100kw, with the turbo, it will put out 120kw and with an intercooler it will put out 130kw.
Not bad huh. Without making your turbo work any harder, you gained about half the increase that just the turbo gave you.
Have fun and ceep cool.
ps. have you seen the yellow RA28 with the twin turbo lexus V8 in it. He uses a liquid/air cooler and runs his coolant pipes through an eski full of dry ice. This gives him inlet temperatures a few degrees less than ambient, you do the maths.
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