Outer Limits 4x4 Board

G'day, i was just wondering if anyone has put a blow off valve on TD42 and if so how did you go about it? Also what sort of mods have people done and sort of power are you making?

Cheers

No butterfly on the intake. So not much benefit.

turps wrote:No butterfly on the intake. So not much benefit.

from the last few time it was discussed, it wont work on a diesel. but if you want the bling sound, google for the electronic gig that makes the blowoff sounds...

You can put one on but it will be pretty much useless, unless you want your rig to be Fooley SIK!!!

Better off spending your money on other mods

Why? Just why?

possible, it does have some gain tho not a lot and will depend a lot on driving style. generally better to spend the $$ elsewhere on some real 4x4 mods.

the only time a blow off valve will work is if your waist gate on the turbo fails. There is actually already one on the intake of the TD42T for that.

darnoldrs wrote:the only time a blow off valve will work is if your waist gate on the turbo fails. There is actually already one on the intake of the TD42T for that.

no

you trigger them off idle and/or clutch switches.

tweak'e wrote:

darnoldrs wrote:the only time a blow off valve will work is if your waist gate on the turbo fails. There is actually already one on the intake of the TD42T for that.

no

you trigger them off idle and/or clutch switches.

Would be keen to hear more about this!

do a search, been discussed and done plenty times before.

simply put, use the brake/system vacuum onto the vacuum of the BOV. its control by a vacuum solenoid which is triggered by micro switch on throttle and/or clutch.
may need to play around with the springs in the BOV.
that way it will open up only when under boost and throttle is idle or clutch is used. it releases the boost thats still in the inlet pipes when you lift the throttle for a gear change. its helps keep the turbo spinning, especially if your running a big turbo.

some people make me laugh

bovs are used on turbo engines to prevent commpresor surge when u take your foot off the gas the air in in the piping going back through the turbo and spinning it the oposite way causeing problems, because the td42 dosent have a butterfly causeing air to be trapped no point to put one on your engine

tweak'e wrote:do a search, been discussed and done plenty times before.

simply put, use the brake/system vacuum onto the vacuum of the BOV. its control by a vacuum solenoid which is triggered by micro switch on throttle and/or clutch.
may need to play around with the springs in the BOV.
that way it will open up only when under boost and throttle is idle or clutch is used. it releases the boost thats still in the inlet pipes when you lift the throttle for a gear change. its helps keep the turbo spinning, especially if your running a big turbo.

With no throttle butterfly..? I'm not saying you're wrong but I would like to learn how this would be.

TURBOMQ wrote:bovs are used on turbo engines to prevent commpresor surge when u take your foot off the gas the air in in the piping going back through the turbo and spinning it the oposite way causeing problems, because the td42 dosent have a butterfly causeing air to be trapped no point to put one on your engine

quiet correct. the butterfly is the MAIN cause.

however there are secondary causes. even without the butterfly you still have the problem of nothing pushing the turbo, a slowing motor that gets in the way of the airflow and an intake full of compressed air which is trying to go back through the turbo. so you still have boost trying to push the turbo backwoulds and no exhaust to push it forwards. hence the turbo slows quiet quickly which then has to spin back up once your foot hits the gas again.

higher the boost you run the worse it gets, hence why BOV doesn't do jack on standard motors. only seen it done on those running fairly high boost.
i understand its quite common on some of the USA guys that run 40psi+.

as i mentioned before effect is small and its much better to spend the $$$$ elsewhere.
however if $$$ no object and your running high boost it may be worth doing to reduce lag on the gear changes.

yeah i have all ready got a few mods and i'm running reasonable boost but i'm looking at putting a bit more into it, plus a mate has got a BOV that i can have. What other mods are people running and with what results?

I think you are after one of these....

http://cgi.ebay.com.au/Turbo-Dose-Pigeo ... 33001r6492

if u wanna be a wanker get a vl turbo, an c how far u get in the bush wif that, wanker

its easy to tell who knows what they are talking about and who dense tard

jemmos wrote:if u wanna be a wanker get a vl turbo, an c how far u get in the bush wif that, wanker

hey theres nothing wrong with vl turbo's

patrol_uterus wrote:its easy to tell who knows what they are talking about and who dense tard

Dunno about that, I can tell who is a dense tard but I still can't tell who knows what they are talking about.

Factory GU 4.2 turbo diesel ...

TURBOMQ wrote:bovs are used on turbo engines to prevent commpresor surge when u take your foot off the gas the air in in the piping going back through the turbo and spinning it the oposite way causeing problems, because the td42 dosent have a butterfly causeing air to be trapped no point to put one on your engine

the turbo does NOT spin the opposite way.

this is a common misconception, which when you think about it, is completely impossible.. Dont forget the exhaust is still pumping through the exhaust housing, keeping the turbo spinning the correct way. The fact that there is now an obstruction in the intake will cause the wheels to slow but no spin the opposite direction..

On topic, unless its purely for the sound, i dont see that a bov on a td will be at all useful.

If you want noise.... No bov works better

http://www.youtube.com/watch?v=8g89Utv1 ... re=channel

Youll just need to be making 650hp before your gonna get that kinda noise tho

I have heard trucks with all manner of mad surge noise in the past, so im sure it is possible on a diesel.

What other mods have people done and how much power are you getting?

I use to get surge all the time with a T3 running 20psi on a TD42. Drive into a bog at full noise and just take the foot off. Turbo would surge every time. A BOV would help stop this and so would be about protecting the turbo not performance gain. And if it was plumed back into the intake there is very little noise anyway.

Don't confuse boy racer shit with real performance mods!

nzdarin wrote:I use to get surge all the time with a T3 running 20psi on a TD42. Drive into a bog at full noise and just take the foot off. Turbo would surge every time. A BOV would help stop this and so would be about protecting the turbo not performance gain. And if it was plumed back into the intake there is very little noise anyway.

Don't confuse boy racer shit with real performance mods!

Correct a BOV is only to protect the turbo.. it gives a slight gain on spool up times in a petrol but other wise is just to save the bearing/shaft in the turbo...

the turbo is spinning at about 120,000 RPM in a petrol when the butterfly closes and there is no where for the boost to go.. it stops the wheel from spining breifly multiple times..giving that effect..

there is a specail diesel BOV you can get.. or with a bit of fiddling around you could make a normal one work.. but id leave it unless your getting hektic mad turbo surge and its killing your turbo every 5000kms.. then id be looking at something..

Theres a guy called Shaun Swaffield up this way that has a hotty GQ Turbo Deisel...

He's a deisel mech up this way and owns Swaftec Industries in Gracemere.

He's got his own pump, manifold and turbo combo with a air to air intercooler and nitros and it puts out upwards of 260HP at the wheels thru an auto.

It's pretty crazy and gives alot of the turbo petrol/v8s a run for their money.

It was at Mud Bulls and Music this year racing around.



I don't think he's got a BOV though... he he