Gedi

What is the average intake temps of the 280bhp scoobs?

Also in comparison, what intake temp are people seeing on their modified (300+) scoobs? (please state whether TMIC or FMIC)

Thanks.

micared

Since no-one else has answered, I'll try. On Saturday mine ( MY00, tek3, a few other mods... maybe 270 bhp?...) was registering about 30 deg. c. at 4k rpm, measured at the i/c to throttle body hose. I live in the Southeast and it was a hot day. Hope this helps!

Gedi

Thanks micared.

Does anyone else have any more to add ?

micared

You're welcome, out of interest, are you monitoring yours, or is this for future reference?

Jolly Green Monster

iTrader: (4)

MY96 when it was running 1bar with TMIC it used to see upto 50ºC on WOT through the gears..

Now got a FMIC and running 1.17bar and seeing more like ambient temp.. + or sometimes minus a couples of degrees..
both measured at the throttle body.

JGM

micared

J.G.M., what sort of ambient temp was that, and is that with a standard topmount?

Jolly Green Monster

iTrader: (4)

I did some detailed measurements here

Simon

97 rExy

Air sensor readings from M48pro(motec) with in car digital display.
Running VF23,VF34 at 1.1-1.4bar boost and fmi.
Around 360bhp at the fly.

Cruising :ambient+ 0 to 2 C

Heavy traffic conditions:ambient+3 to 7 C

Under full boost:ambient + 3 to 4 C

Under full boost with water injection "on" : ambient or lower(1 to 3 C)

AndrewC

Can someone explain how an air-to-air heat exchanger can provide lower than ambient temps? Surely that would require a >100% efficiency which I thought was only possible when the cooling medium was below ambient, such as offshore powerboats using chargecoolers fed by seawater.

I can understand the WI helping as long as the water is below ambient air temp.

Andrew...

PS. MY98 280+WHP Hybrid FMIC with inlet temps at ambient +1-2 deg.

micared

Anybody still using a topmount taking readings? How hot is too hot? Personally not comfortable seeing 50 deg. c. at the t/b, but perhaps that's me being a drama queen, ( it's been said before !!) What do the more knowledgeable of you think is an acceptable limit for prolonged use?

Jolly Green Monster

iTrader: (4)

Andrew,

I presume it is something to do with the velocity of the air passing through the intercooler fins?

30ºC ambient air temp.. travel at 70mph and the bonnet which was at 30ºC or more when you set off will drop below 30ºC.

Likewise the intercooler will be lower than ambient and will then drop the air within it lower..

Could be wrong but just how I see it. Also hear what you are getting at though.


I was not happy with the 50ºC I was seeing with the TMIC hence bought a FMIC.

I don't recall seeing higher than 35º since fitting the FMIC and that is sitting in traffic idling, where the throttle body is heated byt the engine block.. pull off and it drops fairly quick.

micared

Thanks for your help , and the link, interesting stuff on there J.G.M. Did you ever conclude that removing the bonnet seal was of any significance regarding air intake gains? Think there'd be any point trying this with the standard airbox setup?

Jolly Green Monster

iTrader: (4)

I believe it dropped it slightly..

No need to with the original air intake system as it breathes in air from the wheel arch. You will gain a bit and some noise by removing the resonator in the wing it breathers through though.

scooby-k

waiting in the queue at santa pod last month top mount temp reached 65 C
dropped to 30 C after run.
ken

micared

Blimey, don't think I would have run it from 65 deg. Brave man!!!

Jolly Green Monster

iTrader: (4)

when I ran at Scoobyshoot out last year I put my foot on the throttle and idled at 2000rpm to keep throttle butterfly open and air going through the throttle body to help cool it.. I must have sounded like a right burk.. I think I kept temps to 35ºC while waiting to run.. only a couple of car queues and did a couple of runs then switched it off for a while.

dowser

Highest I've seen is ~61 degrees if I recall correctly (probably in the other post), but I've for sure had higher on track last summer (Knocklink's big red was my shift light ).

Since the 22b post I moved the turbo output temp sensor to be next to the cone filter. Interesting result - ambient +10 degrees when cruising at 120-130kmh (75-80mph) on the autobahn. I'd read previously that under bonnet temps with a cone weren't a problem once on the move, but my car would appear to be different.

It is, I suspect, related to the 6 speed gearbox I installed - but I didn't measure intake temps before it's fitment, so cannot say for sure. However, TB temps have risen ~4 degrees since 6MT fitment (which in itself is not an issue). Of concern is that the current saturation point seems much lower, which I wont be able to quantify until I can can cane it on track for 30 minutes at a time.

I've ordered a BMC filter box and will take a direct feed from the side of the radiator aperature (a la WRC ) in an attempt to improve. First serious track session in 2 weeks!

I'm also looking at a few tweaks to improve airflow through the engine bay....and finally ordered an oil temp gauge Question though, how much use is a sump mounted sender, when I've a temp issue between bonnet and engine? I'm concerned that the 6MT (by blocking airflow) is causing a hot spot around the top of the heads and inlet manifold. This will only get worse when my new engine (with manifold insulators) goes in.....

Richard

micared

Any advantage to be gained from mounting your filter in the wing cavity, or does this throw up other issues?

Floyd

iTrader: (9)

I've seen over 70C at the TB with a TMIC on the 'Ring in the height of summer. I didn't see much knock activity above greens at these temps though. Heat soak on those days could see the TB at 90C before a run. Water spray and OB was used...a lot! This was on a classic.

Usual temps on the road will see around 45C in summer and then I won't give it stick under those conditions of course.

F

scoobyslut

I have recently seen details that any temp above 40 deg C, will induce the ECu to lower performance output, as it monitors the intercooled air temp with an air sensor mounted just inside the manifold .

This was pointed out when a few people questioned BHP output from PPP kits and having them "rolling roaded".

Quote " If intake temperature is too high, an STi [UK spec] will produce indications of only 285 BHP" and not the printed 300 bhp.

So, yes, intake temps should concern you guys, especially "if" you want top mark BHP levels.

harvey

iTrader: (48)

Ambient plus 2deg typically in the cruise on both an APS FMIC and a HYBRID.

Jolly Green Monster

iTrader: (4)

APS and HYBRID! two intercoolers on one car Harvey

Simon

micared

Lol@ JGM, ....... hmmmmm, could be the way forward!

Jolly Green Monster

iTrader: (4)

micared

You've been suspiciously quiet, JGM, got those two i/cs working yet?

Jolly Green Monster

iTrader: (4)

No I am happy with my one large Lateral Performance intercooler



As to being quiet, I don;t visit here like I used too.. spend more time on other forums these days.

JGM

micared

Blimey mate, that's a big topmount! ......do you find that the intake temps on the side of your house are significantly affected by having that propped up there, like that?

Jolly Green Monster

iTrader: (4)

I did also try running the car with FMIC and TMIC!

pic1

But decided it was best with just the FMIC..

pic2



Made the house much cooller in the summer btw

harvey

iTrader: (48)

Two engines = two intercoolers.

Jolly Green Monster

iTrader: (4)

LOL..

I think someone should do that in one scoob..

Would be really something.. totally inpractical though etc..