Blow Off Valve On surf need help

[Wld_Srf]

I just put a blow off valve on my surf alot of people say it wont work coz diesels have no vacuum but because of a new fuel pump mine does we had it workin awesome but was blowing blue smoke we found out a few hoses were round the wrong way but since we put them back in the right place the blow off isnt unloading like it used too its taking alot my reving to make it go can anyone help me and tell me how to get it going better???

[RAY185]

It needs to be plumbed into this line going to your boost sensor.

Read this thread, there is a pic of the hose going to the boost sensor thats mounted on your air cleaner housing.

http://www.toyotasurf.asn.au/forum/view ... alve#76806

It should work fine UNLESS you or someone else has disabled the throttle butterfly (Disabled the EGR system).

[bastard]

WHY

[Ruffy]

WHY

Simple... Why??? Because you need a blow off valve To release the excess pressure trapped in the inlet tract when you snap off the throttle at high revs and stall the turbo.

Hang on... You ain't gunna get enough revs or air flow through a surf engine to warrant a blow off valve....
So you gotta ask...

WHY

[udlman]

I have done the blowoff valve on the surf trick. I hav mine open ay 12psi and u would be supprised how often it opens.

Make sure that U plumb it into the boost sensor line , and U will also have to put a softer spring in the valve as well. Ones for petrol cars are too heavy.

Cheers, Brad

[Shadow]

dow5or added a blow off valve one to a 2h in a HJ60, carts hj60 i think.

Apparently the boost spikes very briefly to over 17psi (running 12psi) which probably isnt an engine killing boost spike, but certainly is good to get rid of.

Could try pming them for some advice.

[NiftyNev]

I don't care what the others say. A BOV will work on a manual Surf if installed correctly. I have one to go on mine after I build the water/air intercooler. I suppose the intercooler won't work either.

Nev

[Wld_Srf]

thanks for the help guys fair few helpful people replied the rest r just sum bunch of geeks who need to pull their heads in

[Wld_Srf]

this is for all u geeks out their choppin out lip read this then jam it right in a pipe n spark it up ya losers

As for the blow off valve, I put one on my surf after I started running the higher boost, and it deffinetly kept the boost on harder when changing gears, and the engine didn't have to push as hard between gear changes as the boost was staying on longer.


so blow off valves have no advange ey doesnt seem like it by what i have found on a few other sites so pull ya heads in

[WICKED]

his car he can do what he want's too it.

i'm rather glad this was posted. i'm goin to turbo my shorty next yeart and i'll be puttin a top mount intercooler and the WICKEDist BOV i can find on it. i always wondered if it would work and now i know.

thanks

[Guy]

I cant see how a BOV will work to any great advantage on a diesel, it does not have throttle plates/butterflies like a petrol motor does .. so thee is nothing snapping closed, a diesel creates more power by adding more fuel to the combustion chamber, the additional (Airflow remains pretty much constant) boost is governed by the waste gate on the turbo opening at a preset pressure.


Unless a 2lte (I assume that's what you are running) has a butterfly vale somewhere in the intake I cant see any point .. ( I am not trying to give you "lip" here .. just trying to see how you believe it benefits you ..

Does anyone have a schematic of the 2LT-e intake ?


If there was a legitimate need or use for a BOV I am sure that companies that specialize in diesel performance like banks engineering in the US would offer a kit ..

Can you point me to a few of these other sites you have found BOV on diesals on ?

[udlman]

The 2L-TE is one of the only diesels that I know of that have a butterfly arrangement in the intake. ou can make a BOV work in a non-butterfly setup but it is a lot harder and doesn't really make any difference. The BOV is mainly there to stop turbo stall, which can happen on the surf when running higher boost. I run mine at between 14 and 16psi with some changes to the fuel pump.

In intercooler will work even better. I had an air/water intercooler on mine and one day the intercooler waterpump stopped working and I managed to boil all of the water/glycol in the intercooler system.

When it was working, it was quite good.


Brad.

[Shadow]

2H also has a butterfly on the intake

[Guy]

from reading the surf forum thread ... it sounds like a massive PITA for a gain that can be had by pretty simply disabling the intake throttle vacum butterfly. (right or wrong here)
Also from that thread the thing that seems to be paramount is the "pfft" nosie a BOV makes ...

[Shadow]

from reading the surf forum thread ... it sounds like a massive PITA for a gain that can be had by pretty simply disabling the intake throttle vacum butterfly. (right or wrong here)
Also from that thread the thing that seems to be paramount is the "pfft" nosie a BOV makes ...

On a 2H, (dunno about the 2LTE) it uses the butterfly etc to create a pressure differential which is used by the fuel pump to regulate the fuel. Like a venturi does on a carby.

Disabling it could lead to unpredictable operation when your off the accelerator.

[Guy]

from reading the surf forum thread ... it sounds like a massive PITA for a gain that can be had by pretty simply disabling the intake throttle vacum butterfly. (right or wrong here)
Also from that thread the thing that seems to be paramount is the "pfft" nosie a BOV makes ...

On a 2H, (dunno about the 2LTE) it uses the butterfly etc to create a pressure differential which is used by the fuel pump to regulate the fuel. Like a venturi does on a carby.

Disabling it could lead to unpredictable operation when your off the accelerator.

The LTE uses and electronic delivery system ... (I really have no idea )

[tweak'e]

The 2L-TE is one of the only diesels that I know of that have a butterfly arrangement in the intake.

most modern 4cyl deisels i've seen all have butterflys in the intake. somtimes its just for shutoff but also it can be used as part of the EGR system.

it sounds like a massive PITA for a gain that can be had by pretty simply disabling the intake throttle vacum butterfly. (right or wrong here)

exactly right. most people simply disable the butterfly which means a BOV is of no use. downside is a rough shutdown.

i would be interesting to know if anyone has one used on a dual manifold motor eg nissian ZD30. as they have a butterfly which shuts off one manifold for low rpm use. i havn't checked out a toyota D4 to see if they run anything similar.

[bribiesurf]

My first reaction a few years ago with BOV's on T/D's was WTF?, but now having a Surf, I have considered it. The 2LTE has a butterfly (actually 2, on for the Idle Air Control IAC) it drives the Throttle Postion Switch TPS, this provides an indication to the ECU as to the desired fuel mixture, using a combination of engine temp,air temp, boost pressure and fuel temp(density), quite simple when you nut it out.
The BOV's function in this setup is to bleed excess manifold pressure off when the butterfly is shut so the turbo doesn't get loaded up between gear changes and slowed down. Turbo boost/lag is all related to inertia of the turbine wheel, small turbo=quick boost, but lower output, big turbo=slower to boost, but bigger output, so the trick is to keep the Hampsters happy and have the wheel spinning as free as possible, Thus BOV=better power delivery THROUGH the gears.
if you have seen some rally cars throwing great flames, some had injectors fitted to the exhaust so the ignited the spent gasses and stopped any turbo lag, just kept it spinnig full noise and let the BOV do the work, but for an old shitter of a surf, just bleed it off the crossover pipe, and it can vent to the atmosphere as it is only air, not air fuel which is a no no.

[Shadow]

but for an old shitter of a surf, just bleed it off the crossover pipe, and it can vent to the atmosphere as it is only air, not air fuel which is a no no.

venting to atmosphere is more about the gases etc from your crank case ventilation which is fed into your inlet pre turbo.

thus, any venting to atmosphere is a no no.

[NiftyNev]

venting to atmosphere is more about the gases etc from your crank case ventilation which is fed into your inlet pre turbo.

thus, any venting to atmosphere is a no no.

Correct

Nev

[bribiesurf]

I should have witten more carefully, I set up the CC ventilation via a catch can and directly into the port off the intake manifold post butterfly on my old dungheap, so yes you are right, PCV loop cannot vent to atmosphere

[Shadow]

I should have witten more carefully, I set up the CC ventilation via a catch can and directly into the port off the intake manifold post butterfly on my old dungheap, so yes you are right, PCV loop cannot vent to atmosphere

on a turbo you cant run it to the manifold as the manifold is pressurised. need to patch it in pre turbo.