N/A Performance Chips

[sonett1]

Gorper is spot on about power, fuelling is very easy to deal with, the tricky part with most N/A engines is improving the amount of air it can flow.

The driveability 'trade off' is probably caused by the wrong components for the desired objective, on a track or race car, this is not really an issue, but a car that is to be driven on the road for fun or everyday use can be tuned for driveability if it's done right, even a carb engined car can be almost as good as a car with mapable ECU. More often than not people go for a cam that is to wild and end up being dissapointed.

Going to the library for information is also absolutely spot on! But don't throw the baby out with the bath water, there are some excellent websites out there with priceless information on them and also some very helpfull knowledgeable people with real life experiences of what works and what doesn't.........the hard part is finding them!

[sonett1]

Ok I'll start...


http://www.sdsefi.com/sds3.gif
http://www.pumaracing.co.uk/

[gorper]

Originally Posted by sonett1

Ok I'll start...


http://www.sdsefi.com/
http://www.pumaracing.co.uk/

Fixed your SDS link above.

I agree, there is a lot of good stuff on the 'net.

I'll play...

Fuel Injection:
http://www.megasquirt.info (forum here: http://www.msefi.com)

Engines:
http://speedtalk.com/

Turbocharging:
http://www.gnttype.org/
http://www.turboford.net/faq/index.shtml
http://www.homemadeturbo.com/

Miscellaneous:
Car forum where you're more likely to talk with people who know what they're talking about than those who don't: http://grassrootsmotorsports.com/board/

Calcs, turbos, etc.: http://www.not2fast.com

Chassis:
Alignment 101: http://www.tirerack.com/tires-techpage-1/4.shtml
Handling & Stuff: http://en.wikipedia.org/wiki/Vehicle_dynamics
More Handling & Stuff: http://www.turnfast.com/tech_handling/handling.shtml

[RWElphinstone]

Originally Posted by RWElphinstone

Hey - they say that, "if something sounds too good to be true, it likely is"... ...which may be evident with this little beauty. I did a quick Google search for "chip Saab 900S" and this came up:

http://www.speedydelivery.co.uk/car-...saab-900.shtml

Now, can anyone tell me what the hell it is, or what it does?

Any answer to this one? Anybody?

[Jokke A]

Originally Posted by RWElphinstone

Any answer to this one? Anybody?

Our Power Mod fools your cars computer into thinking that your carss engine is sucking in air at a lower temperature, hence the timing is advanced. Timing advance helps produce more power by igniting the sparks sooner, providing more time for the fuel / air mixture to burn completely, increasing cylinder pressure, thus providing more power.

Quite simple, eh? I'd change the engine for a turbocharged one or start with basic hardware mods (head etc.).

[Saab-Daniel]

Although timing isn't controlled by the fuel-ECU on a saab like this one, so it would be worth nothing...
Daniel.

[93SAABJADE]

So I'm guessing I shouldn't go for the fuel chip and exhaust system. Not worth it?

But I do have a question about my rpms.

Why is it that when I step on it in 3rd gear and it shifts down to 2nd, my rpms go up really slow. I know if I can get the rpms to fly up it would pick up a lot better. Is there some adjusting I could do to fix that? Because when I floor it in 2nd and it shifts to 1st it picks up nicely (not to mention it sounds awesome with the cone filter).

[gorper]

Originally Posted by Saab-Daniel

Although timing isn't controlled by the fuel-ECU on a saab like this one, so it would be worth nothing...
Daniel.

The Jetronic ECU (fuel only) is connected to the EZK (timing only). On Volvos, the EZK is said to receive a signal from the coolant temp sensor. On Saabs, there is no direct connection between the EZK and the coolant temp sensor; however, it may be that this signal comes via the Jetronic ECU. I do not have sufficient EZK documentation to confirm that it gets info re: coolant temp, but if the Volvo stuff does, then it stands to reason that the Saab stuff does, too...

[93SAABJADE]

Can anybody answer my question?

[Saab-Daniel]

What question????
Jokke answered that ages ago...
Daniel

[93SAABJADE]

About the rpms.

[93SAABJADE]

Do autos just have bad response? Can somebody answer my question about the rpms?

[ejenner]

It's just because of the gear ratios. Like when you're riding a bike and you select a different gear. In some gears it's hard to turn the peddals but the bike moves much faster. In other gears the peddals move really eaisly but the bike is slower. 900's with manual gearboxes do the same thing.. i.e. the rpm's don't pick up as quick in the higher gears.

The automatic 3-speed is good with a turbo because of the long ratios. You also don't close the throttle between gear changes so you keep the boost going all the way through the range. Turbo/auto is a great combination. Not sure how tough an auto-box is though. Some people say they're weak and others say they're as strong as the manual box. Hard to tell.

[912 fanatic]

i sent a head out today get .050 shaved off it to get higher compression. going to start to experment.

[93SAABJADE]

Originally Posted by 912 fanatic

i sent a head out today get .050 shaved off it to get higher compression. going to start to experment.

What are mods are you going to do to your N/A and was the head work expensive?

[Jokke A]

Originally Posted by 93SAABJADE

What are mods are you going to do to your N/A and was the head work expensive?

I recommend you to study some basic facts about engines before tuning. Tuning a n/a engine is always a project that demands some know-how, especially with Saabs that don't have the same level of bolt-on kits than some japanese rivals.
http://en.wikipedia.org/wiki/Naturally_aspirated

[912 fanatic]

allright for the last 3 weeks i have raced my 2.1 non turbo on the dirt in a 4cylinder class. i am running my motor on a lh 2.4 fuel system because i used to have a turbo motor in my car for ice racing and it has a jak stage 2 chip in that does not have a rev limit runing with red top injectors too. but last week i need little extra power on the bottom side of the track and i mean just a little bit of power. so my uncle talked to brad a guy from Kansas city and he was told take a 2.0 liter head and shave .050 and put that on my 2.1 block. so i am going to try it.

the motor i am running is a 1993 2.1 that had 116000 miles on it. i have run 3 races on it turning the motor 6000-7000 for the hole race. i am running the motor with 5 quarts of oil in the past my turbo motor on only 4 would burn the bottom up the oil would get pushed to one side and starve the oil pump. i Checked the compression right across the board and each cylinder is 180 pounds.

so when i slap the new head on i will take another compression test to see the difference I hope I see noticeable change in the power of the motor. also my spark plugs are just the right color so i know at the high revs my moter is geting enough fuel

To get the head shaved it cost any where from 150-70 dollars but my father deals with fisher auto parts and is good friends with the owner im going to get it done for I think 20 dollars.

[TheRedBaron]

Originally Posted by 93SAABJADE

About the rpms.

A good mod for you to do would be to get a lighter aluminum flywheel. Swedish dynamics sells them, but they're $500 IIRC. Alternatively, you could get the stock flywheel lightened, depending on how much you trust your machinist.

[912 fanatic]

Got the new head on with .050 taking out of it. It brought the compression up to 215 psi in each cylinder about Their was not a huge difference but I could tell on the low side of the track that the car had a little bit more snot. It allowed me to go down a few extra rpms and still bring the car out of the turn with speed.

I think if I port and polish the head this winter, get a light weight fly wheel, shave the head even more and get the pistons cut where the valves will hit them. Maybe get the motor up to 150psi and get some cams made up the allow the motor to really work.

[spg1]

912finatic,

Im sure your motor is probably putting out that already. What about just by passing the ecu all together and running a mechanical fuel injection. I did this with an 1986 8V saab that I had and disconected everything and put a mechanical fuel valve that runs the fuel to the injectors (not sure at this moment what the proper name is). I got it off of a 1982 saab 8V and it worked great and it was easy to set up.
I really injoyed the power out put of a 1982 saab that I had and that gave me the idea. The 1982 that I had also had a turbo exhaust put on that I had from a parts car and that had some benifit also.
I may not have even unhooked anything but the fuel delevery unit and just put the 82 unit in and then tuned it with the screw on the top.
Dennis