Outer Limits 4x4 Board

ahaha look what i have started. all this to make a wank factor sound come from a hilux diesel.

Little useless fact for everyone, as i work for a Kia Dealership.
Test driving the new Kia Soul CRDi the other day with the computer on it, just looking at specs and what not. at an idle they make 15psi of boost and full open throttle they make a max of 35psi. all this from a little 1.5 VGT.

Dont mean to be rude but i call bullshitt

That is pointless, a hugely strengthend motor for no reason. A diesel as they are run huge compression, an atmosphere being 14.rah rah psi, your then throwing another 2 atmospeheres into the motor. For no sensible reason as it is a stock get around work car/ute/van, huge heat levels would need to be dealt with just to bring it into something sensible

For something to be producing 15psi at idle it would not have the legs to make 35psi efficiently throughtout the rev range, 15psi is just over an atmosphere as mentioned that means from nothing it is producing enough energy to make 100% what a n/a would make.

Most turbos on diesels run 0 on idle, and dont have the legs to run 15-20psi throughout the rev range, A variable vein turbo "could" do it but would still be unrealistic, especially for kia.

If im wrong then my bad and i take it all back

I didnt believe it at first, but talked to a few of the tech guys confirmed that its correct. they do run a variable geometry turbo so it definately is possible not to mention a front mount intercooler. i'll have to print off a graph from the scan tool. when i get back to work.

That be good, speak to them and ask them why on earth they went with a turbo that runs so much positive pressure on idle, excess heat for no reason other than a little fuel economy which imo is just asking for problems.

yeah im not sure. i was looking at egts and they didnt seem to get that hot. under full throttle it got up to about 480 before i was going to fast.

when they for a burn off for the particle filter the egt get up to around 700 at the filter. pretty crazy

not uncommon tho that sound on the extrem range.

i'll bet the little kia runs very low compession.
nissan D40 is 15:1 compession, i think runs 5psi at idle and max of around 20psi. variable turbo can throw the rule book out the window.
the high boost low compession enables to burn lots off fuel for the motor size. that way you can have a smaller lighter motor in a smaller vechile with decent power output.

they run 17.3:1 comp ratio. which is fairly low i guess.

There are electronic blowoff valves avalable for diesels but they are expensive and realy not much point.
A front mount intercooler could also fall in the waste of time bin
on a standard diesel with a small turbo

cooler air on any forced induction motor is always going to help.
might only make 2hp extra but its still a gain.

a friend recently cleaned out his intercooler off a TD42Ti. inside and out. dropped about 70-80degrees in egt.

So would putting a bigger radiator ,Putting a front mounted intercooler on a standard or non modified diesel engine with a small turbo you may drop temp alittle bit but youll create turbo lag

bollocks.
bigger radiator may drop engine temp but it won't drop EGT's. don't confuse engine temp with exhaust gas temps.

some of the these stock engine have turbo outlet temps of over 100 degrees C. any cooling is an advantage as long as th gain from cooling offsets the bit of lag the extra pipes make.

Bollocks Diesels dont run high exhaust temps any way so a cooler engine intake temp will reduce every thing
Oh so your say a high engine temp wont efect any thing what a load of rubbish. Running a front mount on a diesel enging will have very limited in crease in anything and would be off set by the amount of lag thats created

a front mount cooler (unless its stupidly big) will not cause a lot of lag on a diesel as turbo are generally set up to boost at low revs and boost pressure is not blown off between gears, so the front mount will act as a plenum chamber.

An intercooler will lower temps, but on its own may not see any gain in power unless the engine is already being overfueled. The cooler air lets you add more fuel to make more power without increasing EGTs overall.

If a diesel is overfueled it will see very high EGTs, I have seen mine rocket from 500c to 850c + within seconds and still climbing fast under hard acceleration while fiddleng with the tuning

80's_delirious wrote:a front mount cooler (unless its stupidly big) will not cause a lot of lag on a diesel as turbo are generally set up to boost at low revs and boost pressure is not blown off between gears, so the front mount will act as a plenum chamber.

An intercooler will lower temps, but on its own may not see any gain in power unless the engine is already being overfueled. The cooler air lets you add more fuel to make more power without increasing EGTs overall.

If a diesel is overfueled it will see very high EGTs, I have seen mine rocket from 500c to 850c + within seconds and still climbing fast under hard acceleration while fiddleng with the tuning

Sorry man well have to disagree even a top mount intercooler will create lag and enough to be slightly annoying ( I have dyno graphs to show it to)
A front mount is worse and i kind of get what your saying about it acting as plenum chamber but acts more like a dam blocking the turbo from boosting quickly as it has to force all the extra air throught the line to the engine (A BOV in a petrol engine allows this to escape) an intercooler will not all ways lower intake temp

beinthemud wrote:Diesels dont run high exhaust temps any way so a cooler engine intake temp will reduce every thing
Oh so your say a high engine temp wont efect any thing what a load of rubbish. Running a front mount on a diesel enging will have very limited in crease in anything and would be off set by the amount of lag thats created

they can easily run high enough EGT's to melt pistons.
high engine temp may seize pistons etc but it won't cause big increases in EGT's and melt pistons. high EGT's can cause increase engine temp but not the other way around.
excessive EGT's will kill a motor even if its stone cold.

typically the cooler intake air and increase in exhaust flow due to it, can off set the lag. however if intercooler is badly designed it certainly will cause lag.
besides, these are 4x4's not race cars

80's_delirious wrote:I have seen mine rocket from 500c to 850c + within seconds

gotta love it

Course they can melt tweak ,All most all intercoolers will create lag its just the amount that verys if were saying the engine is the same the turbo is the same then any good or shiit intercooler will create lag ,
If you tripple the distance the air has to flow to the engine and and at least double the size of the pipping which in most cases has been done then anyone for lag.
High engine temps can seize pistons is and understatement
A 5dec engine temp increase above operating temp in a F1 race car can destroy an engine
so your saying if engine temp increases to an excesive amount as long as EGTs dont increase then your engine will be fine

these are 4x4's not race cars

couldnt agree more, some have had that much money spent on them.

I think what Tweek is saying is. High Engine Temp is not going to directly affect EGT's, they will increase but not as dramatically as the engine temp has. only a small percentage.

high engine temp may seize pistons etc but it won't cause big increases in EGT's

Whereas a high EGT's will cause a rinse in engine temp obviously because the combustion process is running hotter than usual. aswell as the turbo is getting hotter and intake air temp is hotter aswell.

I completely agree with any setup of intercooler causes turbo lag. its fundermental mechanics. the longer intake/runners you have the bigger lag you're going to get. Whether or not its noticeable is another.

Ash

Ah I took he meant the other way round
Just thought it was getting late over there and the cuz was getting tyred just kidding

--------------------------------------------------------------------------------
For anyone wanting a "sick" noise when they change gears, if they havnt got the turbo bark im happy to post a cd for $200 which will have a bov noise over and over again for the length of 80 mins



lmfao....@ this .......bov ??? isnt he the norwegien god of unneccesary engine modifications.......

zoook wrote:--------------------------------------------------------------------------------
For anyone wanting a "sick" noise when they change gears, if they havnt got the turbo bark im happy to post a cd for $200 which will have a bov noise over and over again for the length of 80 mins



lmfao....@ this .......bov ??? isnt he the norwegien god of unneccesary engine modifications.......

wow that Zoook guy is really funny