| Author | Topic |
|---|
Location:
Adelaide
Registered:
July 2002
|
|
how hot is to hot [air intake]
|
Sat, 08 January 2005 05:54
|
 |
how hot is too hot for air entering the intake on a boosted car? 70c? 80c? 100c?
Cheers
|
|
|
Location:
nth ringwood, Victoria
Registered:
August 2002
|
|
Re: how hot is to hot [air intake]
|
Sat, 08 January 2005 06:13
|
|
|
50 celius in air temp is when my motec shuts down on the dyno
|
|
|
Location:
Adelaide
Registered:
December 2004
|
|
Re: how hot is to hot [air intake]
|
Sat, 08 January 2005 16:02
|
|
The lower the heat the better. That said I wouldnt be too hung up on the exact temp. Most sensors that you would use to read it arent too accurate anyway. What you do want to do is keep it as low as you can.
Above 100 or so inlet you will start having detonation problems.
If the car is NA you might want to consider a cold air intake with a seperate airflow to the engine bay.
Force induction? get a bigger/more efficient intercooler, a water spray or water injection.
Depending on how you tune it a small nos kit (about 25hp) can do a lot for reducing inlet temp as well.
|
|
|
Location:
Adelaide, SA
Registered:
May 2002
|
|
Re: how hot is to hot [air intake]
|
Sat, 08 January 2005 23:15
|
|
Cold air seems to make a bigger difference with forced induction. Maybe not so much with NA, but it'll still be better than hot air 
Feed the intake the coldest air you can, and if you have an intercooler (for forced induction) then make sure it's getting plenty of air and is nicely sized.
|
|
|
Location:
Montrose, VIC
Registered:
May 2002
|
|
Re: how hot is to hot [air intake]
|
Sun, 09 January 2005 01:19
|
|
This is a great question - obviously, if you can keep it to 55 on a 50 degree day, you're doing pretty well, whereas if it was at 55 while dodging icecaps on the south pole, you'd be doing pretty badly... Aim is to have it as close to ambient temperature as possible. Or below if you're using ice/nitrous 
|
|
|
I supported Toymods
Location:
Australia
Registered:
November 2003
|
|
Re: how hot is to hot [air intake]
|
Sun, 09 January 2005 03:00
|
|
Think of it this way, the colder the air, the more timing you can run, the more power you will make.
My intake temps (with Delco airtemp sensor) is about 20deg above ambient (stupid pod filter).
Maybe closer to 10-15 under full throttle.
Creeps up to 40deg above ambient sitting at lights.
And it was at 79deg according to the Dyno Dynamics on the last tune.
No pinging too.
But then again, it wasn't tuned within a poofteenth of detonation.
|
|
|
Location:
Adelaide
Registered:
July 2002
|
|
Re: how hot is to hot [air intake]
|
Sun, 09 January 2005 03:46
|
|
cheers for your answers, i'll try to clarify a bit more
i have an electronic thermometer that i've managed to fit to just before the throttle body butterfly so i can see what intake temperature the engine is sucking in, this is on the 4age in the rolla.
The main reason i ask is that i can set the thing to alarm when a certain temperature is reached. now im not too concerned about temps in the rolla as they seem to be quite close to ambient, 2-5c above ambient when cruising or acclerating at WOT with my setup, but i am thinking more towards my next car, mr2 turbo and i wanted to do the same thing hook up the thermometer to the intake to make sure it doesnt get "too hot" so thats why i was looking for a number. The engine will be kept stock, and depending on intake temps, boost might be upped a couple PSI
CelicaRA45-> 50c? that sounds pretty low is ur car N/A or turbo?
so would you say setting a warning at 80c?
i'm not to worried about the loss of power with air @ 80c vs air@ 30c, but more interested in keeping detonation away
thanks for all the replies
|
|
|
Location:
nth ringwood, Victoria
Registered:
August 2002
|
|
Re: how hot is to hot [air intake]
|
Sun, 09 January 2005 08:42
|
|
|
normaly on the race track its a couple degrees below the whether temp ,but on the dyno and in ambient temp the motec wont compensate after the air temp is 50 c also you lose to much power as well .(example 20 degrees in the air temp between 16 and 17 goes up a bit hi in the revs
|
|
|
Location:
Wollongong
Registered:
November 2004
|
|
Re: how hot is to hot [air intake]
|
Sun, 09 January 2005 10:11
|
|
Air temps... Hmm...
Cruising in a customers car (Doing a street tune)
Temps sat at 34Degree celsius (forced induction)
That was under 3000RPM and under 20% throttle...
As soon as we booted it and hit boost with WOT, temps DROPPED to 30 degrees celsius...
This was on a night of around 25 Degrees celsius...
|
|
|
Location:
Sydney
Registered:
January 2003
|
|
Re: how hot is to hot [air intake]
|
Sun, 09 January 2005 12:26
|
|
Looks like we've convinced you to join the SW20 fold 
MR2's can get pretty toasty in the engine area, even more so with a F/I one. Unmodified they are usually fine, but if you start tinkering you may want to look at additional cooling.
A few places on the net offer a fan shroud designed to fit 2 thermo fans to sit just underneath engine cover.
You've got the snorkel, from what I've heard they do very little except look good, but I've got no evidence there.
Something else I've been meaning to do is run some of the A/C ducting from a side vent up to the airbox(you'll probably have a pod on the GTE, but the concept is the same).
I've no idea about intake temps, but even on really really hot days in traffic for 2.5 hours crawling along the water temp didn't get above half, ever.
|
|
|
Location:
Adelaide
Registered:
July 2002
|
|
|
Location:
Ebbw Vale, Qld
Registered:
January 2004
|
|
Re: how hot is to hot [air intake]
|
Mon, 10 January 2005 02:08
|
|
I have a 1GGTE and the problem I have is that the heat from the engine is heating up the intake pipe just before the throttle. Sometimes it gets so hot u can barely touch it! I'm sure that can't be good for intake temp 
|
|
|
Location:
Terrigal
Registered:
May 2002
|
|
Re: how hot is to hot [air intake]
|
Mon, 10 January 2005 03:12
|
|
Hi all, this topic got my interest and thought I might bring up charge temp. My autronic has a feature that trys to work out the charge temp which is based on the air temp and coolant temp. This is so it gets a more accurate temp of the air actually going into the cylinders (so I guess trys to take into account hot plenum/runners etc).
Anyone know how you actually work this out? Like the air speed is going to change this quite dramatically. In the Autronic you can plot some information in based on engine load I think.
Cheers
Joel
|
|
|
I supported Toymods
Location:
Australia
Registered:
November 2003
|
|
Re: how hot is to hot [air intake]
|
Mon, 10 January 2005 03:17
|
|
The autronic should have an air temp sensor input.
Get a Delco Airtemp sensor, wire it in, get the ecu programmed to suit, and bingo.
The don't do much, except retard the timing if the air temp is over a preset temp.
|
|
|
Location:
Terrigal
Registered:
May 2002
|
|
Re: how hot is to hot [air intake]
|
Mon, 10 January 2005 03:28
|
|
Sorry should have been more clear.. I have the air temp sensor.. I just wanted to understand more about charge temp, vs intake temp.
Cheers
Joel
|
|
|
I supported Toymods
Location:
Australia
Registered:
November 2003
|
|
Re: how hot is to hot [air intake]
|
Mon, 10 January 2005 03:33
|
|
| TurboRA28 wrote on Mon, 10 January 2005 11:28 |
Sorry should have been more clear.. I have the air temp sensor.. I just wanted to understand more about charge temp, vs intake temp.
Cheers
Joel
|
My airtemp sensor is the the middle of my plenum, (after the throttle body, where all should be), so it is actually measuring charge temps (providing I have the meaning of charge temp correct)
|
|
|
Location:
Sydney
Registered:
January 2003
|
|
Re: how hot is to hot [air intake]
|
Mon, 10 January 2005 05:15
|
|
Hunty, looks like a really nice buy! Curious to the price PM me if you want, when insurance gets a little cheaper I'm definately interested in a Turbo SW20.
A few things you should know...
Buy good rubber, true for any car, but if you have a SW20 you'll get a love for windy roads and good tyres really help.
Take it easy in the wet, these babies like to kick out the back in the wet if you give them too much, just drive it "normally" and you wont have any problems.
In warm dry weather it's like driving on train tracks, you've really got to be going hard to get it sideways, but you've got a turbo on your side so it may be a little easier
The standard suspension is pretty good, but I reckon stiffer springs are definately a good move.
Short shifter kits can make changing gears really really easy in a SW20 because it's like having your arm on a arm rest and flicking your wrist occasionally to change gear.
Enjoy your beast put up more pics when you get it.
Got nothing to do with heat, but you did say you had some questions....
|
|
|
mmm 3 t's turbo targa top