User Login    
 + Register
  • Main navigation
Main Menu
Login
Username:

Password:


Lost Password?

Register now!
Fast Search
Slow Search

Advanced Search
Google Ad

Browsing this Thread:   1 Anonymous Users



Topic options
Rate Thread
View mode
« 1 2 (3) 4 5 6 ... 9 »


A14force
Re: manufacturing turbo kits!?!?
#66
No life (a.k.a. DattoMaster)
Joined:
2003/12/3 7:56
From Christchurch NZ
Group:
Registered Users
Posts: 3706
Offline
Quote:

mad120y wrote:
Yep i see what your saying, If your using a decent size and quality turbo this wouldnt be a problem.

Also you could control boost with a restrictive exhuast i guess.

I would ask.... WHY??

you would def not remove the wastegate to make life harder.

a bonus which could be acheived cheaply would be keeping the wastegate gases seperate from the turbo gases for a couple of feet straight out of the flange.


If by decent size, you mean sensibley sized and carefully chosen than yes.

I don't know if a restrictive exhast could be enough to gaurantee that overboost wouldn't occour.

What would the objective be of plumbing the
wastegate discharge into the exhaust further down stream? This would certainly be easeir with an external wastegate.

Posted on: 2006/3/18 21:05
_________________
Forced Induction!
Because everyone knows you don't bring a knife to a gunfight!
Transfer the post to other applications Transfer


mad120y
Re: manufacturing turbo kits!?!?
#65
Home away from home
Joined:
2004/4/14 14:48
Group:
Registered Users
Posts: 371
Offline
Quote:
Once the turbo compressor aheives the desired boost, the wastegate diaphram pushes open the wastegate. This lets gas bypass the exhaust turbine, so that the compressor can't generate more boost. If you don't have this, (Unless the turbo is quite small, and very accurately sized to the engine) the turbo will continue to generate higher boost levels. This will cause the motor to sh1t itself. Motors with BIG turbo's need to run an external wastegate, to allow enough gas to bypass the exhaust turbine that the boost wont creep up


Yep i see what your saying, If your using a decent size and quality turbo this wouldnt be a problem.

Also you could control boost with a restrictive exhuast i guess.

I would ask.... WHY??

you would def not remove the wastegate to make life harder.

a bonus which could be acheived cheaply would be keeping the wastegate gases seperate from the turbo gases for a couple of feet straight out of the flange.

Posted on: 2006/3/18 2:26
Transfer the post to other applications Transfer


Daveman
Re: manufacturing turbo kits!?!?
#64
Home away from home
Joined:
2003/5/19 9:55
From Melbourne
Group:
Registered Users
Posts: 785
Offline
While I don't think our old mate Casper really understands what he is talking about, boost control through blow off valves is not quite as simple as how it was explained below.

It is true that you overwork your turbo to a degree through not allowing it to regulate it's speed by bypassing exhaust gas. However the turbo is regulated by the bov. This happens because the bov lets a proportion of the air that the turbo has just pumped, out to the athmosphere.This then means that not all the air the turbo as worked for will pass through the motor which equals less exhaust gas and hence less energy for the turbine(so it won't spin as fast).
So if you can get your head around that you'll see that the turbine speed is actually regulated. It's still not ideal but it's not as bad as it seems.


Posted on: 2006/3/18 1:54
Transfer the post to other applications Transfer


B210sleeper
Re: manufacturing turbo kits!?!?
#63
No life (a.k.a. DattoMaster)
Joined:
2003/12/3 0:49
From Burbank, CA
Group:
Registered Users
Posts: 2150
Offline
loud bov's are a wank.

bov's that vent to the atmosphere instead of back into the intake are kind of silly, to waste boost like that.

there have been many OEM mpfi non intercooled non-BOV turbo cars and they work just fine. not quite the same as a carb'd car with a turbo but still.

make the kit modular, that way everyone can add their own things they like. Of course the kit isn't engineered to work with the add ons and you experts will be responsible for doing it right.

i'd just be happy to buy the components and do the engineering myself.

Posted on: 2006/3/18 0:29
_________________
|||\ 81 KPB310 /|||
Transfer the post to other applications Transfer


LAGWAGON
Re: manufacturing turbo kits!?!?
#62
No life (a.k.a. DattoMaster)
Joined:
2004/4/15 3:25
From Melbourne Vic
Group:
Registered Users
Posts: 1664
Offline
well at least this discussion has some brains to it...

on the thread hijacking thing. Nispro are famous for not running wastegates and controlling boost through twin BOV's. they are also famous for being overpriced and #### tho.

some people still believe BOV's are a wank anyway.

Posted on: 2006/3/17 23:19
_________________
CA18DET 1200 lagwagon retired
LAG510 - SR20DET 1600 sedan
1000 wagon daily - A series magic
Transfer the post to other applications Transfer


A14force
Re: manufacturing turbo kits!?!?
#61
No life (a.k.a. DattoMaster)
Joined:
2003/12/3 7:56
From Christchurch NZ
Group:
Registered Users
Posts: 3706
Offline
Quote:

mad120y wrote:
Quote:
There will be nowhere for the surplus gas to bypass, and either the motor will destroy the pistons


I dont think thats corect. A restrictive exhaust does the same, simple u just dont make the grunt.

You can bleed excess boost off the intake side. Whether or not this is reliable i would veyr much doubt.


Once the turbo compressor aheives the desired boost, the wastegate diaphram pushes open the wastegate. This lets gas bypass the exhaust turbine, so that the compressor can't generate more boost. If you don't have this, (Unless the turbo is quite small, and very accurately sized to the engine) the turbo will continue to generate higher boost levels. This will cause the motor to sh1t itself.
Motors with BIG turbo's need to run an external wastegate, to allow enough gas to bypass the exhaust turbine that the boost wont creep up.

Posted on: 2006/3/17 21:24
_________________
Forced Induction!
Because everyone knows you don't bring a knife to a gunfight!
Transfer the post to other applications Transfer


731200
Re: manufacturing turbo kits!?!?
#60
Home away from home
Joined:
2003/11/2 6:50
From Sydney Australia
Group:
Registered Users
Posts: 469
Offline
So is the blow through going to use the side draft webber too? and how many?

Posted on: 2006/3/17 14:22
_________________
Quote:
Currently own a 73 1200 with sr20de and a 71 1200 with almost finished a14 blow through
Transfer the post to other applications Transfer


mad120y
Re: manufacturing turbo kits!?!?
#59
Home away from home
Joined:
2004/4/14 14:48
Group:
Registered Users
Posts: 371
Offline
Quote:
There will be nowhere for the surplus gas to bypass, and either the motor will destroy the pistons


I dont think thats corect. A restrictive exhaust does the same, simple u just dont make the grunt.

You can bleed excess boost off the intake side. Whether or not this is reliable i would veyr much doubt.

Posted on: 2006/3/17 10:13
Transfer the post to other applications Transfer


A14force
Re: manufacturing turbo kits!?!?
#58
No life (a.k.a. DattoMaster)
Joined:
2003/12/3 7:56
From Christchurch NZ
Group:
Registered Users
Posts: 3706
Offline
DOOD!
I must interject here.
FYI, a wastegate is the mechanism which allows the exhast gases to bypass the exhast driven impeller in the turbo when the compressor side of the turbo acheives the predetermined boost level.
If you remove it, A, all the exuast gas will bypass the exhuast impeller, and NO BOOST will be made, or B, if you remove the wastegate diaphram. There will be nowhere for the surplus gas to bypass, and either the motor will destroy the pistons, (Quite likely) or (if it's quite worn) the turbo will "expire".
A BOV, is a devise which vents the body of compressed air between the turbo, and the throttle body. This allows the turbo to continue spinning during gear changes, and reduces lag by allowing the turbo to not have to spool up against a body of pressurised air.

I'm not throwing sh1t at your abiltiy to manufacture items of a murchantable quality, but maybe you need to undertake some further research before you attempt to produce something which people are expected to buy.



Posted on: 2006/3/17 10:05
_________________
Forced Induction!
Because everyone knows you don't bring a knife to a gunfight!
Transfer the post to other applications Transfer


mad120y
Re: manufacturing turbo kits!?!?
#57
Home away from home
Joined:
2004/4/14 14:48
Group:
Registered Users
Posts: 371
Offline
confused between blow off and pop off (indy cars)? which use a valve to release the the excess boost

I would assume that they do not have the thaughts of the turbo in mind when doing this. It would be working its arse off!

Posted on: 2006/3/17 10:00
Transfer the post to other applications Transfer



« 1 2 (3) 4 5 6 ... 9 »



You can view topic.
You cannot start a new topic.
You cannot reply to posts.
You cannot edit your posts.
You cannot delete your posts.
You cannot add new polls.
You cannot vote in polls.
You cannot attach files to posts.
You cannot post without approval.

[Advanced Search]