max safe boost pressure .

[burnt_servo]

right now my car spools up really fast to around 18 psi , with a medium haze , not even black .  

i've read in other posts , that around 18 psi is pushing the limit of the turbo , and i risk breaking  the turbo shaft

anyways to what boost psi should i turn my waste gate down too ?


i was thinking around 16 psi , thoughts , idea's ?

[Black Smokin' Diesel]

right now my car spools up really fast to around 18 psi , with a medium haze , not even black .  

i've read in other posts , that around 18 psi is pushing the limit of the turbo , and i risk breaking  the turbo shaft

anyways to what boost psi should i turn my waste gate down too ?


i was thinking around 16 psi , thoughts , idea's ?

Does the engine still have its original headgasket? If so, I wouldn't go higher.

I've got the metal 1.9TD HG in my TD, pushing 23 psi when I floor it.

[jtanguay]

right now my car spools up really fast to around 18 psi , with a medium haze , not even black .  

i've read in other posts , that around 18 psi is pushing the limit of the turbo , and i risk breaking  the turbo shaft

anyways to what boost psi should i turn my waste gate down too ?


i was thinking around 16 psi , thoughts , idea's ?

do you have the 2.5 inch exhaust from the turbo right to the back? if so i wouldn't be worried about 20 psi or so.  that will really help cut egt's.  then again that is just boost.  turning up the fuel i would watch the black smoke.  i've taken my turbo to 20 psi and a bit higher.  it had a lot of go power at that boost level  :twisted:  the problem is that once you go above 15 psi or so, the turbo becomes a heat pump and is doing less good than bad.  to overcome this you need to install an intercooler.

and like black smokin said the metal HG really helps hold the pressure where it should be.

[jimfoo]

What turbo do you have anyway?

[burnt_servo]

What turbo do you have anyway?

what ever was stock in 1988 ... (  i replaced the motor with a lower millage one from a wrecker )  . i beleive it has "kkk" on the housing .

i'm pretty sure it's the same turbo as my 1990 engine .

i'm more concerned about over spooling the turbo , and breaking the shaft ,  than anything ( i'm going on a trip on the long weekend , and need it to stay in one piece ) .

engine temp seems about the same , and i'm not getting black smoke , but a medium-ish haze that you can see through .

yep 2.5 inch exhaust front to back , the cone in the exhaust , that mounts onto the turbo , was a pain to cut bigger with a hole saw , very hard steel .

[jtanguay]

some people have run the K24 turbo up to 25+ psi without much problems.  and i think that was with the stock exhaust.  with your bigger exhaust, the EGT's & backpressure should be much lower, enabling the turbo to pump more air with ease.   an EGT gauge would be quite handy to see what is going on inside.

[burnt_servo]

yes definately , a egt gauge is the next thing i'm buying ,   but it will have to wait till  my income tax money comes in .....

[zukgod1]

I took my car out for a test run last night.

30+ psi wasnt a probem and I'm @ 4500'.

Good thing i have ARP's and the AAZ head gasket.

Hauls ass BTW, no smoke above 20 psi, now I need a intercooler bad.

[burnt_servo]

so basicly , don't worry about the turbo so much , as heat , and poping the headgasket .........

adding  studs and metal headgasket to my list

[zukgod1]

so basicly , don't worry about the turbo so much , as heat , and poping the headgasket .........

DING DING DING!!!!

Head gasket is the problem.

[jtanguay]

i've seen some TD's handle 20 psi on the stock 1.6 gasket without failure.  i guess you take your chances though

[burnt_servo]

i've seen some TD's handle 20 psi on the stock 1.6 gasket without failure.  i guess you take your chances though

at 4500 rpm the govener kicks in hard now , that is also when it  hit 18 psi .

just driving it semi normally i rarely take  it over 12- 14 psi , and it  burns way cleaner than it did before , unless i stand on it and rev it out .

it's almost as fun to drive as the dodge spirit turbo i had a few years ago .

[gldgti]

can i chime in here with a question or 2?

my AAZ mk3 is at the repairers now (some oldy hit me in the back in a carpark) but once it gets back its new exhaust time... i have all the parts sitting here waiting for 2.5" all the way back.

i already have an intercooler on it, and i figure with the new exhaust it shouldnt get too hot... i  have held off touching the wastegate so far, its still on stock boost settings... i cant hit 14psi in a spike but generally its about 11.5.

once the exhaust is on and i can increase the boost, what will be safe for the k14 thats on it?


also, can anyone point me to the thread that discusses putting the AAZ metal HG on a 1.6? i am building a 1.6TD for my other car...

[burn_your_money]

also, can anyone point me to the thread that discusses putting the AAZ metal HG on a 1.6? i am building a 1.6TD for my other car...

If the 1.6 is hydraulic it's a bolt on

[gldgti]

cheers mate... woohoo, big boost 1.6 here i come...