Show full size 924Board.org
Discussion Forum of 924.org
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 
 Technical FAQ924 FAQ (Technical)   Technical924 Technical Section   Jump to 924.org924.org   Jump to PCA 924 Registry924 Registry

basic questions for you turbo kids

 
Post new topic   Reply to topic    924Board.org Forum Index -> 931 Discussion
View previous topic :: View next topic  
Author Message
-nick  



Joined: 16 Nov 2002
Posts: 2700
Location: Cambridge, MA

PostPosted: Fri Mar 07, 2003 9:58 am    Post subject: basic questions for you turbo kids Reply with quote

i've come across quite a few turbos now in my search for another 924. i'm curious about some of the differences between the early/late/euro cars.

i know the late cars have the digital ignition. what is the real benefit of it? just more precise timing? the benefits of tuneable digital ignition is obvious, but i'm curious if the factory system is really noticeable?

also where does that extra ~20hp come from on the euro's? the US and RoW '80's had the same compression so it doesn't come from there. that's a fare bit of hp to loose by going across the pond.

i've read the info on this site about problems with the intake seals on the early cars. any other areas to be concerned about with them? the Porsche is obviously finicky.

finally, what sort of engine performance is attainable withouth intercooling? it looks like a mess to plumb the 951 IC through the nose.

thanks
-nick
Back to top
View user's profile Send private message Send e-mail Visit poster's website
81turbo  



Joined: 03 Nov 2002
Posts: 1065
Location: Oakland, CA

PostPosted: Fri Mar 07, 2003 10:15 am    Post subject: Reply with quote

Digital ignition make a huge difference in how the car runs. It idles smooth, it feels more like a new car. The 81+ exhaust manifold was redesigned to reduce cracking.

The 20hp comes from higher boost. .45 bar for the US cars and .65 and .7 (depending on year and compression ratio) for the Euro cars.

I am not farmiliar with any problems with the intake seals.

If you just add a boost controler you can run up to 1 bar (some do I choose not to) you can easily get 200hp. I run .75 on an 81 I would estimate my horsepower to be around 180.
Back to top
View user's profile Send private message Send e-mail Visit poster's website
Alex Roy  



Joined: 03 Nov 2002
Posts: 694
Location: Springfield Oregon USA

PostPosted: Fri Mar 07, 2003 10:22 am    Post subject: Reply with quote

okay, now I have to ask........I put a boost gauge in my 1980, and it consistently runs 15psi........but it doesn't go over 15psi. I was guessing that could be because maybe the PO put in a higher rate boost spring. I don't think it is a problem with the wastegate because it always tops out at 15psi and stops rock solid at 15psi (could actually be 14.7). Should I worry about a broken waste gate, or is it more likely that they put in a 1 bar spring?

Also, after I put the intercooler in, I was planning on raising the boost higher, maybe 17psi with an electronic boost controller (I already have parts for a rebuild incase the engine blows up, it already has a new head gasket).
Back to top
View user's profile Send private message Visit poster's website
-nick  



Joined: 16 Nov 2002
Posts: 2700
Location: Cambridge, MA

PostPosted: Fri Mar 07, 2003 10:42 am    Post subject: Reply with quote

thanks, that pretty much clears up all my questions. fwiw, i read about the turbo to intake seal problem is in the tech section.

-nick
Back to top
View user's profile Send private message Send e-mail Visit poster's website
Smoothie  



Joined: 01 Jan 2003
Posts: 8029
Location: DE (the one near MD, PA, NJ)

PostPosted: Fri Mar 07, 2003 10:44 am    Post subject: Reply with quote

Alex - Unless there's a well hidden boost control valve in there somewhere, my best guess would be you have a stiffer wastegate spring - assuming the gauge isn't lying. Mine goes up to about 7 psi with my added-on boost valve fully open (inactive state). I have the VDO combined boost-vacuum gauge.
_________________
"..it's made in Germany. You know the Germans always make good stuff."
- shamwow guy

'82 924T, US version, dark green metallic, 5 speed Audi 016G gearbox
Back to top
View user's profile Send private message Visit poster's website
924martinirossi  



Joined: 04 Nov 2002
Posts: 605
Location: Seattle, Washington, USA

PostPosted: Sat Mar 15, 2003 1:04 pm    Post subject: Reply with quote

Alex, as far as I know the car is completly stock. I did not put a stiffer spring in. Over all how is the car doing? Today I commented to a mechanic that I should of kept the 80 and sold the 81 or go buy a NA.

Michael
Back to top
View user's profile Send private message Send e-mail Visit poster's website
porsche931US  



Joined: 05 Apr 2003
Posts: 5

PostPosted: Fri May 23, 2003 7:45 am    Post subject: Boost controller Reply with quote

Ya i was just wondering if anyone knew if there was a place online that sold aftermarket boost controllers.I dont really care whether it is a manual or digital. If u would pleace just let me know if anyone knows of any sites.
Back to top
View user's profile Send private message
Alex Roy  



Joined: 03 Nov 2002
Posts: 694
Location: Springfield Oregon USA

PostPosted: Fri May 23, 2003 7:54 am    Post subject: Reply with quote

best place I have seen is Ebay.....just search for "boost controller" and you will get 2-3 pages.
Back to top
View user's profile Send private message Visit poster's website
Lizard  



Joined: 03 Nov 2002
Posts: 9379
Location: Abbotsford BC. Canada

PostPosted: Fri May 23, 2003 8:24 am    Post subject: Reply with quote

http://www.lindseyracing.com/boost4.htm
_________________
3 928s,
Back to top
View user's profile Send private message Send e-mail
78porsche924  



Joined: 14 Dec 2002
Posts: 1217
Location: Newark, DE(near where DE,MD and PA meets)

PostPosted: Fri May 23, 2003 2:07 pm    Post subject: Reply with quote

u really love lindseyracing.com don't u lizard???
_________________
90 944 S2
78 924 NA <---now sold and killed by new owner
snailshell trans
Bae turbo kit
to check out my 944 S2 http://www.cardomain.com/member_pages/view_page.pl?page_id=388139
Back to top
View user's profile Send private message Send e-mail Visit poster's website AIM Address Yahoo Messenger
Lizard  



Joined: 03 Nov 2002
Posts: 9379
Location: Abbotsford BC. Canada

PostPosted: Sat May 24, 2003 3:35 am    Post subject: Reply with quote

78porsche924 wrote:
u really love lindseyracing.com don't u lizard???


they have some nice perf parts on there site, and they have a site in canada on the west coast which is perfect, no duties
_________________
3 928s,
Back to top
View user's profile Send private message Send e-mail
78porsche924  



Joined: 14 Dec 2002
Posts: 1217
Location: Newark, DE(near where DE,MD and PA meets)

PostPosted: Sat May 24, 2003 4:07 pm    Post subject: Reply with quote

U sure u don't work for them j/k. u just seem to mention them alot. See there is a p-car palce in canada.
_________________
90 944 S2
78 924 NA <---now sold and killed by new owner
snailshell trans
Bae turbo kit
to check out my 944 S2 http://www.cardomain.com/member_pages/view_page.pl?page_id=388139
Back to top
View user's profile Send private message Send e-mail Visit poster's website AIM Address Yahoo Messenger
Lizard  



Joined: 03 Nov 2002
Posts: 9379
Location: Abbotsford BC. Canada

PostPosted: Sat May 24, 2003 10:08 pm    Post subject: Reply with quote

78porsche924 wrote:
U sure u don't work for them j/k. u just seem to mention them alot. See there is a p-car palce in canada.

yah 1 maybe 2 but not alot that I have really easy access to
_________________
3 928s,
Back to top
View user's profile Send private message Send e-mail
78porsche924  



Joined: 14 Dec 2002
Posts: 1217
Location: Newark, DE(near where DE,MD and PA meets)

PostPosted: Sun May 25, 2003 1:05 pm    Post subject: Reply with quote

Yeah i feel you. My main parts places around me are the dealer....and pep boys. Basically i pay way too much for stuff or i get the wrong stuff(dumbasses still say the purolator fuel filter fits me car when purolator doesn't even make a filter that does). That is why i usually order online.
_________________
90 944 S2
78 924 NA <---now sold and killed by new owner
snailshell trans
Bae turbo kit
to check out my 944 S2 http://www.cardomain.com/member_pages/view_page.pl?page_id=388139
Back to top
View user's profile Send private message Send e-mail Visit poster's website AIM Address Yahoo Messenger
Display posts from previous:   
Post new topic   Reply to topic    924Board.org Forum Index -> 931 Discussion All times are GMT + 11 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group