[jassi]

completely understand psycho - which is why i am thinking if a primary safely modded car (eg peted getz or rd601 + ffe + cai swift petrol) and a secondary all out mods car (eg zen/esteem) makes sense.

BTW - can a ffe be done on a diesel vgt (eg getz/verna vgt crdi) - i don't think anyone on this forum has yet confirmed it ??

[TomRider]

Originally Posted by jassi

BTW - can a ffe be done on a diesel vgt (eg getz/verna vgt crdi) - i don't think anyone on this forum has yet confirmed it ??

I checked with automec. They have not done yet.

Quoting from their email.

"We have not developed free flow exhausts for diesels. As for teh Getz and Swift CRDis, there is little that can be done, that too after the turbocharger. The changes might yield some performance benefit, but then it will have to be done on the car itself, as we have got no enquiries for these cars."

"all the development work is done here at our workshop in Mumbai. So, unless you make a trip to Mumbai, there is little chance of getting it done elsewhere."

[jassi]

besides i have heard that diesels don't sound that tasty after a ffe if an ffe or even a minor exhaust change is possible in the first place!!

[TomRider]

Our Ambassador had an insanely loud exhaust, back home.

I have seen a couple of diesel cars with a good exhaust note. Even I am planning to go for a Getz D of Swift D after coming back to India.

[greenhorn]

I Believe some of the tourist buses I've seen ( or rather, heard ) run some kind of FFE, judging by their exhaust notes. I guess it is do-able after all

[jassi]

loud exhaust notes are not always good - i was referring to something with lot of bass in it and not actually that loud but pleasant to an auto-enthusiast

I haven't actually heard of any diesel with an ffe so far given that accent crdis have been there for quite some time, plus we have the mail from automech saying nothing much can be done for getz crdi or swift ddis

[v1p3r]

Originally Posted by headers

BOSS, guess you could just add a BOV and an intercooler to any Turbo? I'm afraid not unless you understand engine design and thermodynamics!

Guess we should not throw all the words that we see / read onto the forum without a proper understanding of the function. No offense though!

I'm sorry, but you CAN add a BOV and intercooler to almost any turbo setup, if it doesn't already have one. I say almost because I cannot think of one where this addition is not applicable. Guess we should also do a little more research. No offense here either.

Originally Posted by PatienceWins

Its not easy as it sounds. These engines/ parts are designed by experts and all the parts need to be in sync to perform optimally. If understanding the technology and replicating or enhancing it was easy, car manufactures would not be lending technology from others. I would recommend not to get into experiments.

Nothing venture, nothing won. If no one wanted to experiment, we'd still all be riding horses and living under trees. Actually make that walking.

Originally Posted by pawan

problem is the cost of a getz and petes it is going to work out costly if i am right around 8l odd.

rather a zen with a honda mill like a b series motor for say around 4-5l including car which makes more sense but again some money should be spent on chassis and handling mods like better suspension and a roll cage.
should make the car fast some 250+ bhp per tonne.but again time problem with the zen build is quite sure.

Of all people, you should know that Zens and plans for cheap and fast build are just that, plans. And I'd like to see a B series engine actually fit and run in a Zen.

[headers]

Originally Posted by v1p3r

I'm sorry, but you CAN add a BOV and intercooler to almost any turbo setup, if it doesn't already have one. I say almost because I cannot think of one where this addition is not applicable. Guess we should also do a little more research.

Hi, can you add a BOV setup to the Indica/Indigo 1.4litre? I'd doubt that.

A BOV is added where the turbo develops more boost than required by the engine, and the BOV is opened to save the Turbo from the excess pressure build up. This happens more so in high revving engines where the sudden drop in engine rpm will leave the turbo in full boost and the engine does not require that boost..hence the BOV is opened to release to atmosphere.

Not all turbos need to have a BOV..but thats my opinion...lets explore a little more on that!!

A BOV adds more cost to the turbo build too.

[Psycho]

Originally Posted by headers

A BOV is added where the turbo develops more boost than required by the engine, and the BOV is opened to save the Turbo from the excess pressure build up. This happens more so in high revving engines where the sudden drop in engine rpm will leave the turbo in full boost and the engine does not require that boost..hence the BOV is opened to release to atmosphere.

1) A BOV is to release pressure when the the throttle plate is closed as it would build a sudden back surge to the turbo which could lead to a sudden stoppage in the spinning of the blades. This could cause the turbine shaft to shear. hence the need of a BOV to release the excessive boost.

2) Boost pressure is maintained by a Wastegate that lets exhaust gasses bypass the exhaust turbine hence reducing the amount of boost created.

3) You can add it to any sort of Turbo application, a bit difficult in diesels as they do not create vaccum to release the boost when you release the accelerator. You may need to use an electrical or mechanical system to activate the same.

[kutlee]

psycho chetta, please explain point3.
you mean to say that diesel 'accelerator' is actually an actuator that put more fuel to the air and hence no 'plate' kind of things in petrol where the air (or is it mixture?) is contolled. Since there is no plate to shut of the supply necessitating the need for a sytem to control the "air hammer" effect?

[Sankar]

Psycho, in Petrol engines when the throttle plate shuts the boost pressure is vented through the BOV. So in Diesel engines where there is no throttle plate a BOV is not necessary, or is it?

And what are the benefits of installing a BOV in a Diesel?

[v1p3r]

Originally Posted by headers

Hi, can you add a BOV setup to the Indica/Indigo 1.4litre? I'd doubt that.

Yes you can.

Originally Posted by headers

A BOV is added where the turbo develops more boost than required by the engine, and the BOV is opened to save the Turbo from the excess pressure build up. This happens more so in high revving engines where the sudden drop in engine rpm will leave the turbo in full boost and the engine does not require that boost..hence the BOV is opened to release to atmosphere.

If you drive a diesel hard and powershift, you will hear a rattling/krr-krr sound. Most people think it is clutch play of some kind. That is actually backpressure hitting the impeller of the turbine and causing it to sometimes shift on the shaft, scraping the inside of the housing. As you can imagine, on a turbine wheel spinning at 200,000 rpm, this is not healthy. More so if you do it often. This can easily be avoided with the use of a BOV. Other advantages include much quicker spool-up between shifts.

Originally Posted by headers

Not all turbos need to have a BOV..but thats my opinion...lets explore a little more on that!!

A BOV adds more cost to the turbo build too

Not all of us need CRDxs or tubeless tyres or better braking, but we buy them for the superior technology, which may translate into long term savings and safety, sometimes at the cost of a higher immediate purchase price.

Originally Posted by Sankar

Psycho, in Petrol engines when the throttle plate shuts the boost pressure is vented through the BOV. So in Diesel engines where there is no throttle plate a BOV is not necessary, or is it?

A BOV is necessary everywhere. Using a throttle plate, it can be actuated via a pressure difference. In a diesel, there is no TP, and thus you cannot use a mechanical actuator. You need a throttle-based or clutch-based solenoid actuator. This has been done abroad. HKS sells a diesel BOV which is rather expensive. quicker spool-up.

Originally Posted by Sankar

And what are the benefits of installing a BOV in a Diesel?

The advantages are the same, longer turbo life,

[vabs78]

Originally Posted by v1p3r

If you drive a diesel hard and powershift, you will hear a rattling/krr-krr sound. Most people think it is clutch play of some kind. That is actually backpressure hitting the impeller of the turbine and causing it to sometimes shift on the shaft, scraping the inside of the housing.

Question.
If there is no throttle plate then how this happens?
How is air quantity regulated in diesel?

[headers]

Originally Posted by v1p3r

That is actually backpressure hitting the impeller of the turbine and causing it to sometimes shift on the shaft, scraping the inside of the housing. As you can imagine, on a turbine wheel spinning at 200,000 rpm, this is not healthy.

I agree to the purpose of a BOV..but cant imagine the impeller touching any part of the turbocharger as it will definitely break into pieces..

Also, agreee that the wastegate does the basic function of controlling the boost hence the BOV is not necessary!

It may be good to have one for crazy hard driving individuals like me..but if the turbo does not break, something else will: LOL
cheers:

[Psycho]

Well just imagine a diesel turbo spinning and producing boost even when you lift off and the engine getting excessive air and not receiving not enough fuel to support what do you think happens?

There is a definite chance of a knock. now imagine that you have a chance to relieve the pressure from the system and allow the engine to breathe easily.

Next imagine the diesel engine dropping revs and not being able to use the boost that has been built up and the wastegate opens to relieve pressure that slow