Newest APC-mod! - Page 2 - SaabCentral Forums
* site search:  
Home Saab Pictures Saab Classifieds Saab Dealer Listings Saab Forum Saab Forum

Go Back   SaabCentral Forums > Saab Classic 900, 1979-1993 & '94 Convertible > Saab Classic 900 Performance, Mods & Tuning
Saab Classic 900 Performance, Mods & Tuning Covers Tuning & Performance modifications for the Classic Saab 900

SaabCentral.com is the premier Saab Forum on the internet. Registered Users do not see the above ads.
Reply
 
Thread Tools Display Modes
  #21  
Old 11-05-05
Saab-Daniel's Avatar
Saab-Daniel Saab-Daniel is offline
Saab Lunatic
 
Join Date: Jul 2003                                                
Location: Orlando, Florida
My Saabs: '91 Monte Carlo 'vert
Posts: 2,876
Default

Hi Tadek...
This mod alters the 40-ohm resistor, instead, the 50-ohm potentiometer will help you out. I think mine is adjusted to around 45 ohms or so, giving me 0.350 volts over the pot. The old 40-ohm mod was made to a few box's here in Denmark aswell, and I have yet to see your results. I will look into it, and ask people to try out what you did on the motor-way. Hope we can figure this out, but if it's the mod that causes it, we will have to look into that aswell, of course...
Daniel.
__________________
Still preaching MS...!
They call him... "The Reverend"....

Now with C900 Monte Carlo Convertible, weekend-cruiser :-)
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #22  
Old 11-05-05
martin.nicoll's Avatar
martin.nicoll martin.nicoll is offline
SaabNut!
 
Join Date: Feb 2005                                                
Location: London
My Saabs: 270 bhp '02 9-3 Aero-HOT
Posts: 493
Default

Quote:
Originally Posted by trackside
"The car did a 15.01 1/4 mile run on a semi-wet track" -I do find this a little hard to believe from only an APC adjustment. 15 sec 1/4 mile times from FWD cars need some serious power and expert launching.
I can believe that, my T8 ran 16.2 with just a de-restricted exhaust and MBC.
__________________
2002 Saab 9-3 Aero - 270bhp (approx.)

Abbott Trionic 7 upgraded ECU, Abbott 3" downpipe/race cat/exhaust, PiperX panel filter and air induction feed, Red top injectors, Bilstein B8 Sprint shock absorbers, Koni lowering springs, 25mm rear ARB, Abbott steering rack brace and clamp, Abbott suspension bushes, Removed heat shield under bonnet

Coming soon....
Viggen big break conversion, New IC, New hybrid turbo
Reply With Quote Quick reply to this message
  #23  
Old 11-05-05
Basre Basre is offline
Banned
 
Join Date: Nov 2004                                                
Location: canada
Posts: 637
Default

Wellllll... Mate.. A Lot of us HAVE been wasting our time with Fuel Mods and Ic Upgrades :-)
Extra Fuel is not really needed up to 18 Psi.. and then water injection is the prefferable route.
OEM Ic's are lindeed limiting.. at 20 psi .. but much less so at 16psi.
There is a LOT of hearsay and anecdotal evidence in the Saab worlld about what is needed and what does what.. But this IS the internet and all manner of Sillyness gets passed off as Gospel :-)
Do yr own experiments and you may get different ideas than the generally posted ones :-)
Reply With Quote Quick reply to this message
  #24  
Old 12-05-05
Jezzadee's Avatar
Jezzadee Jezzadee is offline
Saab on the Brain!
 
Join Date: May 2003                                                
Location: Southwold UK
My Saabs: Yamaha FZ6 Fazer
Posts: 9,170
Default

As stated earlier by Alex, there seems to be quite a difference when it comes to fuelling between Lucas and Bosch systems. Stock Lucas cars seem to cope far better with higher levels of boost. Not very scientific I know, but I peak at 1.25 bar using an MBC with a stock Lucas system, except for the FPR which is only 2.5 bar instead of 3 bar. No knock detected on several rolling roads, and it has surprised a few people when they see the lower rated FPR. I think it just shows the potential of the other components in the system. My boost drops off after 4000 rpm though, so at 5500 rpm I'm at about 0.7 bar. I would have thought 1 bar up to 6000 rpm is certainly possible on stock Lucas fuelling, but not recommended.

(Not that I suggest anyone else tries my setup at home - it just happens to work for me.)
__________________
Go Dutch
Reply With Quote Quick reply to this message
  #25  
Old 12-05-05
-Frank-'s Avatar
-Frank- -Frank- is offline
SaabNut!
 
Join Date: Jun 2004                                                
Location: UK Herts/Beds
My Saabs: 93 1.9 tid 55
Posts: 394
Thumbs up

I have just got my K&N cone filter and battery cables to move the battery to put the exhaust on. I think i might do this mod at the same time.

UNLEASHED
__________________
Is it a brid? Is it a plane?
Its a SAAB

Reply With Quote Quick reply to this message
  #26  
Old 12-05-05
nick900 nick900 is offline
Active Member
 
Join Date: Feb 2003                                                
Location: Cardiff, Wales, UK
Posts: 65
Default

If you look at the picture, he has removed the headlamp for better airflow to the intercooler. I am sure that this would help quite a bit. If you think of full boost for most of those 15 sec then the standard intercooler would benefit greatly from headlamp removal, so it might not be just the APC tweak.
Reply With Quote Quick reply to this message
  #27  
Old 12-05-05
Saab-Daniel's Avatar
Saab-Daniel Saab-Daniel is offline
Saab Lunatic
 
Join Date: Jul 2003                                                
Location: Orlando, Florida
My Saabs: '91 Monte Carlo 'vert
Posts: 2,876
Default

I agree nick, that probably will help. I removed mine too And the weather was misty/wet with around 13 degrees celcsius, so pretty cold too. The car did idle every time the line moved, so must have heated some then... I think the head-lamp removal help though, nice airflow to the IC!
Daniel.
__________________
Still preaching MS...!
They call him... "The Reverend"....

Now with C900 Monte Carlo Convertible, weekend-cruiser :-)
Reply With Quote Quick reply to this message
  #28  
Old 16-05-05
Tadek's Avatar
Tadek Tadek is offline
Senior Member
 
Join Date: Feb 2005                                                
Location: Hannover/Germany
Posts: 167
Default

Hi guys!

Just to keep you informed: I removed the "new mod" and now run the "old mod" from 900aero.com. Boost ist nice and stable with the old setup again.
The new mod is no good for me, as stable boost without spiking and overboosting is more important to me than the boost taper "problem" at high rpm.
Enjoy the boost,

Tadek
Reply With Quote Quick reply to this message
  #29  
Old 16-05-05
trackside trackside is offline
Saab Crazy
 
Join Date: Oct 2004                                                
Location: London
Posts: 883
Default

"Extra Fuel is not really needed up to 18 Psi.. and then water injection is the prefferable route." - at high rpm and 18psi - stock fueling is inadequate.
"OEM Ic's are lindeed limiting.. at 20 psi .. but much less so at 16psi." - even at 16psi there is a large pressure drop and their small size and poor position means that they soon become heatsoaked and ineffective.
Reply With Quote Quick reply to this message
  #30  
Old 16-05-05
Alex's Avatar
Alex Alex is offline
Saab Lunatic
 
Join Date: Aug 2001                                                
Location: Crossing the England/Wales border
My Saabs: 3dr c900 T16RA, 9-5 Aero Estate
Posts: 4,666
Default

Quote:
Originally Posted by Basre
Extra Fuel is not really needed up to 18 Psi.. and then water injection is the prefferable route.
Is this 18psi from a T3, TE-05 or hybrid turbo? Running Bosch or Lucas injection?

Water injection shouldn't be used as an alternative to inadequate fuelling either.

Quote:
Originally Posted by Basre
OEM Ic's are lindeed limiting.. at 20 psi .. but much less so at 16psi.
The stock IC will heatsoak very quickly even on a car running standard boost and will take up to 4miles of gentle(ish) driving to cool down again, and this effect on performance is very noticeable even in the UK climate. Changing to a FMIC, which can be done cheaply if using a 2nd hand Volvo unit, is one of the best initial modifications that can be carried out and will allow the car to perform consistently on every throttle application. This is before the boost is even increased.
Reply With Quote Quick reply to this message
  #31  
Old 16-05-05
Si's Avatar
Si Si is offline
Saab on the Brain!
 
Join Date: Jan 2003                                                
Location: 5225′34″N 00152′19″W
My Saabs: Sensonic NG900T, a gagle of rusty c900's
Posts: 5,975
Default Alternative to Volvo

.......nearly finished my modded intercooler, I've welded together 2 standard coolers and made 2 single outlet endcaps for it, just got to seal up the ends properly now and then fit it. I'll post some pic's when it's done(also got to sort out a lame website to host pics), will be interesting to see how it copes, I'm also trying to reduce the intercooler pipes down as much as poss as they seem quite long on the volvo mod.

Anyway , I concur, when i've been a bit heavy footed you can tell the standard intercooler gets saturated very quickly and you loose performance, fingers crossed the modded one with double the flow rate/volume should help.
Reply With Quote Quick reply to this message
  #32  
Old 16-05-05
Tadek's Avatar
Tadek Tadek is offline
Senior Member
 
Join Date: Feb 2005                                                
Location: Hannover/Germany
Posts: 167
Default

@ Alex: Water injection shouldn't be used as an alternative to inadequate fuelling either.

Okay, but what is inadequate? It depends on your setup! Most turbocharged cars run a very rich mixture at full load to prevent detonation. Therefore slight increases of boost / performance are possible without heavy changes to the injection system. On the other hand, if you still want more power and boost, the fueling has to be adjusted accordingly. You would probably want to run an even richer mixture with higher boost to be on the safe side.
But if you use water injection, the additional fuel won't do any good, because the water will do the job of cooling and knock prevention. As a matter of fact the additional fuel will cost you some power, because the engine will produce max. power at an air/ fuel ratio of approx. 12,5.
I aggree that water injection should not be used as an alternative to adequate fueling, but water injection changes your need for fuel.
I used a rising rate FPR, which was nice untill I installed WI. With WI I had to reduce the fuel pressure by installation of an 3.0 bar FPR (LH2.2) and the car runs noticably better with lower fuel pressure.
Cheers,

Tadek
Reply With Quote Quick reply to this message
  #33  
Old 16-05-05
Alex's Avatar
Alex Alex is offline
Saab Lunatic
 
Join Date: Aug 2001                                                
Location: Crossing the England/Wales border
My Saabs: 3dr c900 T16RA, 9-5 Aero Estate
Posts: 4,666
Default

I to use water injection as part of the overall engine tuning. As with your car it enables me to lean the mixture out slightly (and this is just as applicable if running lower boost pressures as well) and run increased timing.
Reply With Quote Quick reply to this message
  #34  
Old 19-05-05
SteveS's Avatar
SteveS SteveS is offline
Senior Member
 
Join Date: Dec 2002                                                
Location: down the pub
My Saabs: 900 Carlsson
Posts: 163
Default

Dan

Would it be possile for you to post a few pics of the mod? I have a spare Red APC which i would like to try out your mod on but this will be my first APC mod so don't want to get it wrong. it certainly sounds easy enough but better safe than a blown engine

Cheers
Reply With Quote Quick reply to this message
  #35  
Old 19-05-05
Saab-Daniel's Avatar
Saab-Daniel Saab-Daniel is offline
Saab Lunatic
 
Join Date: Jul 2003                                                
Location: Orlando, Florida
My Saabs: '91 Monte Carlo 'vert
Posts: 2,876
Default

Hi Steve. I only have a camera-phone, so can't take proper photos of it... But if I can borrow a digi-cam, I could deffo post pictures. It's not hard to do the mod...

Daniel.
__________________
Still preaching MS...!
They call him... "The Reverend"....

Now with C900 Monte Carlo Convertible, weekend-cruiser :-)
Reply With Quote Quick reply to this message
  #36  
Old 20-05-05
dr_zero dr_zero is offline
Junior Member
 
Join Date: May 2005                                                
Location: buffalo, new york
My Saabs: 1989 900 Turbo
Posts: 6
Default

at the risk of sounding like an idiot i have a couple questions.

when you say "mount" in the instructions do you mean that the existing resistor is left in place and that the new item is soldered to the same point on the board (or soldered to that side of the resistor, as if in parallel or 1/2 in parallel) ??

(i.e., a side of the resistor isn't taken from it's location and soldered to something else)

the only things "removed" from the board being R138 and the right side of R36 ??


also, is this mod is for any of the 16V turbos ?? i have an 89 900T and i am debating this with an extra APC box for the fun of it. are there different APC boxes out there for 16V turbos ?? also does this require changing the FPR to a 3.0 bar ??

thanks a lot.

sorry for my ignorance
Reply With Quote Quick reply to this message
  #37  
Old 20-05-05
Kaas Kaas is offline
Saab Crazy
 
Join Date: Jul 2004                                                
Location: Denmark
Posts: 604
Default

Quote:
Originally Posted by SteveS
Dan

Would it be possile for you to post a few pics of the mod? I have a spare Red APC which i would like to try out your mod on but this will be my first APC mod so don't want to get it wrong. it certainly sounds easy enough but better safe than a blown engine

Cheers
Hi Steve!
I think I have some pics at home on my puter somewhere! If I remember it I will look when I get home from work!

Cant you find a black box insted! And keep the red one! They are a bit rare! A black one dont cost much from the scrappy!
Reply With Quote Quick reply to this message
  #38  
Old 20-05-05
Kaas Kaas is offline
Saab Crazy
 
Join Date: Jul 2004                                                
Location: Denmark
Posts: 604
Default

Here is some pics of the new mod!






Reply With Quote Quick reply to this message
  #39  
Old 20-05-05
Bennie's Avatar
Bennie Bennie is offline
Active Member
 
Join Date: Apr 2005                                                
Location: Holland
My Saabs: 900s aero T5Suited stage 7
Posts: 87
Default

Hi! here some pics of my mod.

But the mod does not work properly.

What did i do wrong??
__________________
900s aero Trionic 5.5 and more hardware mods!
Reply With Quote Quick reply to this message
  #40  
Old 21-05-05
Kaas Kaas is offline
Saab Crazy
 
Join Date: Jul 2004                                                
Location: Denmark
Posts: 604
Default

Is your R36 "right side" On the same leg where the R102 is conneced to the pot? You see the yello wire!
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Bookmarks

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the SaabCentral Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Display Modes

Posting Rules
You may post new threads
You may 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


All times are GMT -4. The time now is 05:54 PM.



Powered by vBulletin® Copyright ©2000 - 2014, vBulletin Solutions, Inc.

top of page | sitemap | email us



copyright © 2003 - 2011 saabcentral.com, All rights reserved http://www.whiter.co.uk - valid xhtml - valid css
SaabCentral is an independently run website and is not affiliated in any way to Saab Automobile AB.


Garage Plus vBulletin Plugins by Drive Thru Online, Inc.