Search



Go Back   Third Generation F-Body Message Boards > Tech Boards > Power Adders
Register Forgot Password?

Power Adders Getting a Supercharger or Turbocharger? Thinking about using Nitrous? All forced induction and N2O topics discussed here.

Welcome to ThirdGen.org!
Welcome to ThirdGen.org.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, join the ThirdGen.org community today!


Reply
 
Thread Tools Search this Thread
Old 11-05-2005, 01:13 PM   #1
Supreme Member
 
rx7speed's Avatar
 
Join Date: Aug 2001
Location: Caldwell,ID
Posts: 5,373
Car: 2005 BMW 545i
Engine: 4.4L N62B44
Transmission: 6spd auto
Axle/Gears: Rotating

Classifieds Rating: (0)

Send a message via ICQ to rx7speed Send a message via AIM to rx7speed Send a message via MSN to rx7speed
turbo and carbed. blowthrough or drawthrough?

I'm just curious here as to what the differences are between them in operation and what you would need to set one up and tune.
__________________
www.txkingstock.com
imports are cool - r1cers suck
I play with my wankel
rotary---> <--- LS6
rx7speed is offline vBGarage Page   Reply With Quote
Old 11-05-2005, 08:56 PM   #2
Senior Member
 
Join Date: Dec 2002
Location: BC Canada
Posts: 531
Car: 81Malibu
Engine: SBC 355
Transmission: TH400

Classifieds Rating: (0)

have you tryed a
sleepybu is offline vBGarage Page   Reply With Quote
Old 11-05-2005, 09:12 PM   #3
Supreme Member
 
rx7speed's Avatar
 
Join Date: Aug 2001
Location: Caldwell,ID
Posts: 5,373
Car: 2005 BMW 545i
Engine: 4.4L N62B44
Transmission: 6spd auto
Axle/Gears: Rotating

Classifieds Rating: (0)

Send a message via ICQ to rx7speed Send a message via AIM to rx7speed Send a message via MSN to rx7speed
actually I did and didn't find a lot of the info I was looking for.

maybe you could lend a hand since your here?
rx7speed is offline vBGarage Page   Reply With Quote
Old 11-06-2005, 04:10 PM   #4
Member
 
Join Date: Dec 2004
Location: Garage
Posts: 208
Car: 85 Camaro Z28
Engine: 350
Transmission: 700-R4

Classifieds Rating: (0)
Draw through means the carbs sit on top. Like in a roots blower- PULLED through

Blow through means the air is PUSHED through...

Check out the turbo mustang site...TONS of info...people say blow thru doesn't work....lots of guys running insane setups with 25lb+ boost...one guy on the board has a 1200hp setup with a powerglide that he takes on the street regularly.
Project is offline vBGarage Page   Reply With Quote
Old 11-06-2005, 09:45 PM   #5
Supreme Member
 
rx7speed's Avatar
 
Join Date: Aug 2001
Location: Caldwell,ID
Posts: 5,373
Car: 2005 BMW 545i
Engine: 4.4L N62B44
Transmission: 6spd auto
Axle/Gears: Rotating

Classifieds Rating: (0)

Send a message via ICQ to rx7speed Send a message via AIM to rx7speed Send a message via MSN to rx7speed
understand the differences with how they work. but tuning differences?
would I need a blow off valve on a draw through setup.
how much worse is the lag going to be on a draw through?
what about mounting differences wit hthe draw through
rx7speed is offline vBGarage Page   Reply With Quote
Old 11-07-2005, 12:56 PM   #6
Senior Member
 
Join Date: Feb 2005
Location: Fort Lauderdale, FL
Posts: 1,034
Car: 91 Camaro RS
Engine: 305 TBI
Transmission: 700R4
Axle/Gears: 2.73 Posi w/Disc

Classifieds Rating: (0)
Send a message via AIM to PhLaXuS
According to Corky Bell, the draw-though is somewhat more inferior. I get the feeling that he also doesn't much care for carbs at all.

Off the top of my head, I think the lack of an intercooler is your biggest challenge. That alone makes it worth discounting draw-through as a viable option.
__________________
"People do, in fact, act in a reasonable and responsible manner without constant government intervention."

http://www.motorists.com/pressreleases/montana.html

Last edited by PhLaXuS; 11-07-2005 at 12:59 PM.
PhLaXuS is offline vBGarage Page   Reply With Quote
Old 11-10-2005, 12:19 AM   #7
Supreme Member
 
rx7speed's Avatar
 
Join Date: Aug 2001
Location: Caldwell,ID
Posts: 5,373
Car: 2005 BMW 545i
Engine: 4.4L N62B44
Transmission: 6spd auto
Axle/Gears: Rotating

Classifieds Rating: (0)

Send a message via ICQ to rx7speed Send a message via AIM to rx7speed Send a message via MSN to rx7speed
for low boost (6-8psi) would you relaly need an intercooler?
aren't a lot of stock carbed turbo setups non-intercooled?
also I could swear there are guys running roots s/c without an intercooler.

but yeah if I could an intercooler would be something that would be nice.

what other complications would I need to look at with either design as tuning carbs isn't my strong point.
rx7speed is offline vBGarage Page   Reply With Quote
Old 11-10-2005, 10:16 AM   #8
Junior Member
 
tommyt's Avatar
 
Join Date: Jul 2004
Location: Hungary
Posts: 93
Car: 87 T/A
Engine: built NOS 350
Transmission: manual 700r4

Classifieds Rating: (0)

Draw-thru takes a special type of carb, with the seals set up to have gasoline being pulled thru the turbo. Most carbs are not set up for this. Blow-thru poses a different set of problems, which would be sealing the throttle shafts etc. but this is usually done pretty well, so they work ok, especially on lower boost motors. If had to choose, I would say blow-thru is better most of the time. The carb would have to be modified specifically for each type of setup. (Draw-thru would be more like a roots blower type carb, blow-thru more like a centrifugal blower type)
tommyt is offline vBGarage Page   Reply With Quote
Old 11-10-2005, 11:17 AM   #9
Senior Member
 
Join Date: Feb 2005
Location: Fort Lauderdale, FL
Posts: 1,034
Car: 91 Camaro RS
Engine: 305 TBI
Transmission: 700R4
Axle/Gears: 2.73 Posi w/Disc

Classifieds Rating: (0)
Send a message via AIM to PhLaXuS
Quote:
Originally posted by rx7speed
also I could swear there are guys running roots s/c without an intercooler.
Very true, but in my personal opinion, a forced induction setup without intercooling is a job not yet complete -- good for testing & proof-of-concept, but incomplete. I think OEMs are to blame as they sometimes leave the IC out for cost reasons. If the engineers had any say over the penny-crunchers, they'd have one in every car.

Roots looks cool, but not too efficient (I think they're around 50%).
__________________
"People do, in fact, act in a reasonable and responsible manner without constant government intervention."

http://www.motorists.com/pressreleases/montana.html

Last edited by PhLaXuS; 11-10-2005 at 11:19 AM.
PhLaXuS is offline vBGarage Page   Reply With Quote
Old 11-10-2005, 11:49 AM   #10
Supreme Member
 
rx7speed's Avatar
 
Join Date: Aug 2001
Location: Caldwell,ID
Posts: 5,373
Car: 2005 BMW 545i
Engine: 4.4L N62B44
Transmission: 6spd auto
Axle/Gears: Rotating

Classifieds Rating: (0)

Send a message via ICQ to rx7speed Send a message via AIM to rx7speed Send a message via MSN to rx7speed
Quote:
Originally posted by tommyt
Draw-thru takes a special type of carb, with the seals set up to have gasoline being pulled thru the turbo. Most carbs are not set up for this. Blow-thru poses a different set of problems, which would be sealing the throttle shafts etc. but this is usually done pretty well, so they work ok, especially on lower boost motors. If had to choose, I would say blow-thru is better most of the time. The carb would have to be modified specifically for each type of setup. (Draw-thru would be more like a roots blower type carb, blow-thru more like a centrifugal blower type)
isn't it the turbo that needs to be special with carbon seal or something like that.
this way when under load the turbo doesn't start getting oil sucked past it's seals.

as far as blow through I'm sure I would not go with just a hat on the carb but rather a whole box to surround the carb. this way pressure inside should be close to pressure outside so as not to leak air.

one of my worries with a blow through system though is tuning. it seems it would make it more difficult to tune and would require a fuel pressure regulator which I would have no idea how to setup for this application and I'm sure some type of BOV which wouldn't be that hard
rx7speed is offline vBGarage Page   Reply With Quote
Old 11-11-2005, 10:49 PM   #11
Member
 
Join Date: Dec 2004
Location: Garage
Posts: 208
Car: 85 Camaro Z28
Engine: 350
Transmission: 700-R4

Classifieds Rating: (0)
Intercoolers are totally optional. My VR4 Ball drive hits 14lbs of boost and I make MORE power without an intercooler...with an intercooler I was hitting 11lbs and loosing 2 tenths...

Gear drive s/c make a ton more heat vs old ball bearing style.
Project is offline vBGarage Page   Reply With Quote
Old 11-14-2005, 02:05 AM   #12
Senior Member
 
Join Date: Jan 2004
Location: Chagrin Falls, Ohio
Posts: 391

Classifieds Rating: (0)
Send a message via AIM to nightrider87
Quote:
Originally posted by tommyt
Draw-thru takes a special type of carb, with the seals set up to have gasoline being pulled thru the turbo. Most carbs are not set up for this. Blow-thru poses a different set of problems, which would be sealing the throttle shafts etc. but this is usually done pretty well, so they work ok, especially on lower boost motors. If had to choose, I would say blow-thru is better most of the time. The carb would have to be modified specifically for each type of setup. (Draw-thru would be more like a roots blower type carb, blow-thru more like a centrifugal blower type)
That's twice in the 2 min i've been browsing the power adder forum that i've gone after reading one of your posts.

A draw through carb doesn't need any modification to work, its metering air just like it thinks it should be. You'll barely have to fatten up jets.

Blow through carbs need a bit of modification. Removal of the choke tower and solid nitrophyl floats are really the most necessary. Throttle shafts on the holleys are decent and those on the edelbrocks are better....but either is going to do just fine up to high boost levels...like 20+

oh and in regards to hat or box. The extreme velocity hat is getting great reviews from everyone. I'm ordering one this week.
nightrider87 is offline vBGarage Page   Reply With Quote
Old 11-14-2005, 06:35 AM   #13
Junior Member
 
tommyt's Avatar
 
Join Date: Jul 2004
Location: Hungary
Posts: 93
Car: 87 T/A
Engine: built NOS 350
Transmission: manual 700r4

Classifieds Rating: (0)

Sorry, that was a typo...I meant specially set up turbo...as can be seen from the rest of the sentence...
So, You dont think the power valves on a draw thru setup should be boost referenced ?
tommyt is offline vBGarage Page   Reply With Quote
Old 11-14-2005, 07:23 AM   #14
Junior Member
 
tommyt's Avatar
 
Join Date: Jul 2004
Location: Hungary
Posts: 93
Car: 87 T/A
Engine: built NOS 350
Transmission: manual 700r4

Classifieds Rating: (0)

As for blow-thru, the floats are needed, the choke tower milling also, but I started with a HP carb, and it had those done out of the box, so didnt have to worry about that. BUT:
here is what I did: o-ringed throttle shafts, enlarged PVCR holes, and installed big needle and seat assemblies. The HP also has the screw in air bleeds, so that will help too. I still dont know, only hope that the carb will be able to flow enough fuel...will have to wait and see. This is for my twin t76 BBC with A2W...I will make my own hat , I dont like the tight turning radius of the EV or similar hats, even tho they do have a divider built into them...
But never mind me, I'm just a noob
tommyt is offline vBGarage Page   Reply With Quote
Old 03-26-2007, 10:43 PM   #15
Member
 
Join Date: Mar 2007
Location: Casper, Wyoming
Posts: 205
Car: 1982 Camaro Z28 w/ RS groundfx
Engine: 350
Transmission: Tranzparts 700r4
Axle/Gears: 3.23's

Classifieds Rating: (0)
Re: turbo and carbed. blowthrough or drawthrough?

how do you control the amount of boost you want to run with a draw thru setup??
blue82_z28 is offline vBGarage Page   Reply With Quote
Old 03-29-2007, 05:07 AM   #16
Supreme Member
 
83 Crossfire TA's Avatar
 
Join Date: Jun 2001
Location: DC Metro Area
Posts: 7,011
Car: 87TA 87Form 71Mach1 12SHO 04Cummins

Classifieds Rating: (2)

Re: turbo and carbed. blowthrough or drawthrough?

That’s a trick question, right?

Same way as you do a blow through…
83 Crossfire TA is offline vBGarage Page   Reply With Quote
Old 03-30-2007, 04:19 PM   #17
Supreme Member
 
rx7speed's Avatar
 
Join Date: Aug 2001
Location: Caldwell,ID
Posts: 5,373
Car: 2005 BMW 545i
Engine: 4.4L N62B44
Transmission: 6spd auto
Axle/Gears: Rotating

Classifieds Rating: (0)

Send a message via ICQ to rx7speed Send a message via AIM to rx7speed Send a message via MSN to rx7speed
Re: turbo and carbed. blowthrough or drawthrough?

so why do you need to mill the choke tower on a blow through setup?


and for a simple 6 psi lower power setup would you guys say for ease of install to just to do a draw through then? also how can I find oout for sure if the turbo is the positive seal type?
rx7speed is offline vBGarage Page   Reply With Quote
Old 04-26-2007, 09:38 PM   #18
Supreme Member
 
83 Crossfire TA's Avatar
 
Join Date: Jun 2001
Location: DC Metro Area
Posts: 7,011
Car: 87TA 87Form 71Mach1 12SHO 04Cummins

Classifieds Rating: (2)

Re: turbo and carbed. blowthrough or drawthrough?

[quote=rx7speed;3284732]so why do you need to mill the choke tower on a blow through setup?[quote]

So it doesn't blow shut or mess up airflow...
83 Crossfire TA is offline vBGarage Page   Reply With Quote
Old 06-04-2007, 07:55 PM   #19
Junior Member
 
Join Date: Jun 2007
Posts: 1

Classifieds Rating: (0)
Re: turbo and carbed. blowthrough or drawthrough?

Ok, I am not only new to this idea but new to this site. This topic was the topic that has drawn me in. I am building a Chevy 350 with my father right now. I have been entertaining the idea of turboing it. Which type of turboing would be the cheapest and easiest for me to do in my back yard. What parts are exactly needed? Does anyone have pictures of both methods of turboing?

Thanks,
Jimmy
harleyd2900 is offline vBGarage Page   Reply With Quote
Old 02-20-2012, 08:07 PM   #20
Senior Member
 
TheMonster's Avatar
 
Join Date: Jun 2009
Location: Evansville, IN
Posts: 510
Car: 1983 Z28
Engine: Forged 355
Transmission: 700r4
Axle/Gears: 2.73

Classifieds Rating: (0)
Re: turbo and carbed. blowthrough or drawthrough?

Jimmy I am in the same situation. My dad and I are rebuilding my motor (in the sig) and I have been thinking about a turbo. If you have a welder and can fab up a manifold and an ebay turbo, with a modified blow through holley double pumper. I have to do a ton of reading though.
__________________
1983 z28 Camaro
'78 355ci forged and balanced
700R4 with shift kit, stock stall
10 Bolt 2.74 open

Last edited by TheMonster; 02-20-2012 at 08:15 PM.
TheMonster is offline vBGarage Page   Reply With Quote
Old 02-20-2012, 08:07 PM
ThirdGen
1992 Camaro




Paid Advertisement


Reply

Go Back   Third Generation F-Body Message Boards > Tech Boards > Power Adders

Tags
49, ahu, big, block, blow, blower, camaro, carb, carbed, draw, drawthrough, garbus, manifold, mustang, setup, ta, turbo
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

 


1982 Camaro '82 || 1983 Camaro '83 || 1984 Camaro '84 || 1985 Camaro '85 || 1986 Camaro '86 || 1987 Camaro '87 || 1988 Camaro '88 || 1989 Camaro '89 || 1990 Camaro '90 || 1991 Camaro '91 || 1992 Camaro '92


All times are GMT -5. The time now is 08:43 AM.


Powered by vBulletin® Version 3.7.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
All content copyright © 1997 - 2014 ThirdGen.org. All rights reserved. No part of this website may be reproduced without the expressed, documented, and written consent of ThirdGen.org's Administrators.

Emails & Contact Details