Welcome to the North American Subaru Impreza Owners Club Saturday April 19, 2014
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Technical > Pre-2002 Factory Turbo Powertrain

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

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, free of charge, 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, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 03-06-2005, 01:04 AM   #1
simple monkey
Scooby Newbie
 
Member#: 81067
Join Date: Feb 2005
Chapter/Region: NWIC
Location: port orchard, WA
Vehicle:
1989 RX, FX16
both white

Default rx turbo?

whats the biggest turbo i can put on my 89 RX without having too much lag?
* Registered users of the site do not see these ads.
simple monkey is offline   Reply With Quote
Old 03-06-2005, 04:50 AM   #2
Calebz
Scooby Specialist
 
Member#: 54398
Join Date: Feb 2004
Chapter/Region: NWIC
Location: Souf Central France
Vehicle:
1980 CB400 Hawk
1996 GrandCherokeeLimited

Default

Theres nothing that is a straight bolt on mod.. Zip, nada, zilch

However, there are a few people running VF10-12s and a few others, like myself that have TD04s.. I'm still experimenting with mine, but I did some other stuff at the same time and lag doesn't seem too bad.. Actually, with the compression boost I gave the motor while it was out, Lag is about the same as stock
Calebz is offline   Reply With Quote
Old 03-07-2005, 12:08 AM   #3
simple monkey
Scooby Newbie
 
Member#: 81067
Join Date: Feb 2005
Chapter/Region: NWIC
Location: port orchard, WA
Vehicle:
1989 RX, FX16
both white

Default

i know what a TD04 is, but what is a VF10-12 from?
simple monkey is offline   Reply With Quote
Old 03-07-2005, 01:11 AM   #4
jake15
Scooby Specialist
 
Member#: 36662
Join Date: May 2003
Chapter/Region: NWIC
Location: spanaway, Washington
Vehicle:
1990 legacy dohc 2.2
6speed w/ brembos bishes!

Default

vf-10-11's are turbo legacy, and i think vf-12's are from overseas legacy/libertys (they also have vf10-12, and a vf-8)
jake15 is offline   Reply With Quote
Old 03-07-2005, 01:27 AM   #5
ncarn8
Scooby Specialist
 
Member#: 71419
Join Date: Sep 2004
Default

auto gt legacy's have the VF10 its the smallest
Manual JDM RS got the VF8
Aussie delivered RS got the VF12
VF10 exh and VF8 or 12 comp cover works quite well.
The VF12 comp wheel IIRC is slightly different, maybe a mill or so bigger.
ncarn8 is offline   Reply With Quote
Old 03-08-2005, 10:49 PM   #6
simple monkey
Scooby Newbie
 
Member#: 81067
Join Date: Feb 2005
Chapter/Region: NWIC
Location: port orchard, WA
Vehicle:
1989 RX, FX16
both white

Default

are the size of these turbos bigger or smaller then that of a starion or a saab?
do diesel turbos work well?
simple monkey is offline   Reply With Quote
Old 03-09-2005, 09:14 AM   #7
Warp3
NASIOC Supporter
 
Member#: 161
Join Date: Aug 1999
Chapter/Region: South East
Location: WNC
Vehicle:
06 WRX TR (SGM)
89 MR2 (Ice Blue)

Default

Back when I still intended to upgrade my RX (I'm leaving it pretty much stock now that I have the Legacy Turbo), I was intending to have Jerry at Deadbolt Speed (http://www.deadboltspeed.com) build a hybrid turbo for me by putting a TD04 compressor in the stock VF7 housing (and retaining the stock VF7 turbine). My reasons for this were twofold: (1) it would spool faster than a TD04 due to the smaller turbine (though the max flow rate would be lower than a real TD04) and (2) it would still bolt on as it was using the stock housing.

Another option would be to hybridize it with another RHB5 turbo (like a VF10/11 from a Legacy Turbo or one of the turbos from the T-bird Turbo Coupes (the later models from that series, not the earlier ones which had T3 turbos instead)) or you could replace it outright with a TD04 or something similar and redo the exhaust and intake plumbing to accomodate it.

Shane
Warp3 is offline   Reply With Quote
Old 03-10-2005, 11:53 PM   #8
simple monkey
Scooby Newbie
 
Member#: 81067
Join Date: Feb 2005
Chapter/Region: NWIC
Location: port orchard, WA
Vehicle:
1989 RX, FX16
both white

Default

if you cant tell already im a bit of a penny-pincher (and im not very familiar with turbos), im very interested getting the most power for the least amount of money. would putting the TD04 in my stock housing cost less then getting a whole TD04 + all the other parts needed?
simple monkey is offline   Reply With Quote
Old 03-11-2005, 01:03 AM   #9
ncarn8
Scooby Specialist
 
Member#: 71419
Join Date: Sep 2004
Default

i wouldnt bother with the hybrid work bastardising IHI and mitsus. I dont think it works anyway.
Just get the td04. If you want to spend money on the hybrid scenario, that money would be better used in getting a later model turbo. after all, it is 2 rat**** factory turbos you are working with. TD 04 s are wuite small and do spool up n icely. They are newer and better designed thatn the old VF8 10 and 12s.
Theres a lot of maths and tech. going into turbo choice, but i really dont think your going to come up with something thats amazing better than STD with the hybrid idea.


PS warp 3 - VF7????
ncarn8 is offline   Reply With Quote
Old 03-11-2005, 02:42 AM   #10
Calebz
Scooby Specialist
 
Member#: 54398
Join Date: Feb 2004
Chapter/Region: NWIC
Location: Souf Central France
Vehicle:
1980 CB400 Hawk
1996 GrandCherokeeLimited

Default

Quote:
Originally Posted by ncarn8

PS warp 3 - VF7????
VF4 through 7

Factory turbos on EA81 and EA82 cars. Substantially smaller than a TD04
Calebz is offline   Reply With Quote
Old 03-11-2005, 05:21 AM   #11
ncarn8
Scooby Specialist
 
Member#: 71419
Join Date: Sep 2004
Default

Quote:
Originally Posted by Calebz
VF4 through 7

Factory turbos on EA81 and EA82 cars. Substantially smaller than a TD04
hahaha lol
ncarn8 is offline   Reply With Quote
Old 03-11-2005, 01:01 PM   #12
Warp3
NASIOC Supporter
 
Member#: 161
Join Date: Aug 1999
Chapter/Region: South East
Location: WNC
Vehicle:
06 WRX TR (SGM)
89 MR2 (Ice Blue)

Default

Quote:
Originally Posted by ncarn8
i wouldnt bother with the hybrid work bastardising IHI and mitsus. I dont think it works anyway.
It can, indeed, be made to work, but requires some major "clearancing" inside the VF7 housing due to the much larger TD04 wheel.

Quote:
PS warp 3 - VF7????
Yeah, the stock turbo on the RX.

A big thing to keep in mind is that everyone has a different definition of acceptable turbo lag. I forgot to mention that my build goal was autocross where low-end torque is important and lag is very bad. I was willing to sacrifice some high-end power to get a bit more low-end grunt and spool-up speed (plus the EA82Ts aren't exactly lag-free stock). The VF7/TD04 hybrid setup would give me extra power capability without increasing the lag as much as a full TD04 would.

For a normal street build, something along the lines of a regular TD04 should work perfectly fine and be still relatively lag free since it isn't exactly a huge turbo (though some exhaust/intake reworking will need to be done as the flanges and inlets aren't quite the same, also the TD04 may have to be clocked to have the inlets pointing in a useful direction as well).

Shane
Warp3 is offline   Reply With Quote
Old 03-11-2005, 01:06 PM   #13
Warp3
NASIOC Supporter
 
Member#: 161
Join Date: Aug 1999
Chapter/Region: South East
Location: WNC
Vehicle:
06 WRX TR (SGM)
89 MR2 (Ice Blue)

Default

Quote:
Originally Posted by simple monkey
if you cant tell already im a bit of a penny-pincher (and im not very familiar with turbos), im very interested getting the most power for the least amount of money. would putting the TD04 in my stock housing cost less then getting a whole TD04 + all the other parts needed?
Going for the TD04 should be the cheaper route. Sure you need to modify the connections a bit (like the exhaust flanges) as I've noted above, but TD04s can be had quite cheaply from WRX owners who are upgrading and no longer have a use for the stock turbo. The labor cost involved in the hybrid (especially since it is not a bolt-on affair to put a TD04 compressor wheel into a VF7 housing) would likely make it a more expensive option in the long run despite it being a "bolt-on" turbo once it is built.

Shane
Warp3 is offline   Reply With Quote
Old 03-11-2005, 02:46 PM   #14
Calebz
Scooby Specialist
 
Member#: 54398
Join Date: Feb 2004
Chapter/Region: NWIC
Location: Souf Central France
Vehicle:
1980 CB400 Hawk
1996 GrandCherokeeLimited

Default

Quote:
Originally Posted by Warp3
It can, indeed, be made to work, but requires some major "clearancing" inside the VF7 housing due to the much larger TD04 wheel.



Yeah, the stock turbo on the RX.

A big thing to keep in mind is that everyone has a different definition of acceptable turbo lag. I forgot to mention that my build goal was autocross where low-end torque is important and lag is very bad. I was willing to sacrifice some high-end power to get a bit more low-end grunt and spool-up speed (plus the EA82Ts aren't exactly lag-free stock). The VF7/TD04 hybrid setup would give me extra power capability without increasing the lag as much as a full TD04 would.

For a normal street build, something along the lines of a regular TD04 should work perfectly fine and be still relatively lag free since it isn't exactly a huge turbo (though some exhaust/intake reworking will need to be done as the flanges and inlets aren't quite the same, also the TD04 may have to be clocked to have the inlets pointing in a useful direction as well).

Shane

It can be done pretty easily without clocking. When I did mine, the only real issues I found were that the TDo4 outlet got in the way of the EGR solenoid (removed) and the throttle cable mount (relocated).

Like you, I was willing to sacrifice some top end for quicker spool up. So I went with 9.0:1 flat topped pistons instead of the 7.7:1 dished pistons that the EA82Ts came with. So far so good, bu I haven't had a chance to test it fully.. my neighbors don't particularily care for the sound of an open downpipe
Calebz is offline   Reply With Quote
Old 03-13-2005, 09:37 PM   #15
simple monkey
Scooby Newbie
 
Member#: 81067
Join Date: Feb 2005
Chapter/Region: NWIC
Location: port orchard, WA
Vehicle:
1989 RX, FX16
both white

Default

say i put new 8.5:1 pistons in my stock EA82T, would the connecting rods be able to withstand the new compression ratio?
simple monkey is offline   Reply With Quote
Old 03-14-2005, 11:06 AM   #16
Calebz
Scooby Specialist
 
Member#: 54398
Join Date: Feb 2004
Chapter/Region: NWIC
Location: Souf Central France
Vehicle:
1980 CB400 Hawk
1996 GrandCherokeeLimited

Default

If I say yes, one will blow. So I will say probably
Calebz is offline   Reply With Quote
Old 03-20-2005, 08:28 AM   #17
chet0213
Scooby Newbie
 
Member#: 51857
Join Date: Jan 2004
Location: frederick
Vehicle:
2002 wrx
platinum silver

Default

good info guys
i am getting ready to purchase a 88 rx
will be in touch
chet0213 is offline   Reply With Quote
Old 03-20-2005, 04:56 PM   #18
Kevin Thomas
Street Racing Instructor
Moderator
 
Member#: 110
Join Date: Jul 1999
Location: 1997 OBS, 1996 SVX, 1988 RX
Vehicle:
1989 1989 XT6

Default

Another option is to contact TechWorks Engineering in Canada to get a downpipe made so you can connect a GT17 turbo to it. I'm not sure if they can design it to connect to the stock uppipe though. I do know that it connects to their header. No lag! As a matter of fact, low end torque has been increased.
Kevin Thomas is offline   Reply With Quote
Old 03-20-2005, 11:49 PM   #19
simple monkey
Scooby Newbie
 
Member#: 81067
Join Date: Feb 2005
Chapter/Region: NWIC
Location: port orchard, WA
Vehicle:
1989 RX, FX16
both white

Default

how well do k24 or k26 turbos work on EA82T's? i can get those easily and cheaply too. are these turbos bigger than the stock one?
simple monkey is offline   Reply With Quote
Old 03-31-2005, 10:43 PM   #20
simple monkey
Scooby Newbie
 
Member#: 81067
Join Date: Feb 2005
Chapter/Region: NWIC
Location: port orchard, WA
Vehicle:
1989 RX, FX16
both white

Default

did i say something wrong? i didnt mean kkk as anything bad, im black, dont worry. i heard the german turbos have lots of seal problems, is this true?
simple monkey is offline   Reply With Quote
Reply

Thread Tools
Display Modes

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
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Turbo replacement for 88 rx turbo 88subarurxturbo 'Old School' Subaru Forum 4 08-16-2006 01:00 PM
89' Subaru RX turbo--Bigger turbos?? wighti Factory 2.0L Turbo Powertrain 7 02-26-2006 05:14 PM
Got a ride in a white subaru RX turbo tonight Handsdown Off-Topic 9 08-27-2003 03:16 AM
('93-'01) I need pix and specs on an 88 Subaru RX Turbo! BrysImpreza Impreza Forum 7 03-07-2003 02:19 PM
FS: 1985 Subaru RX Turbo Sedan Dennis ex24 Tri-State Area Forum 0 12-22-2002 01:13 PM


All times are GMT -4. The time now is 05:50 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.