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Discussion Starter #1
I am about to have a T16S intercooler fitted to my low mileage C900S LPT ('93 on a K plate).

SOC forum suggested that this modification is good for the health of the car but will not boost the power output greatly. At £100 it is darned cheap as far as I am concerned, so I'm happy so long as it doesn't harm the old girl.

Can anyone please suggest any other value for money performance enhancements?
 

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Some people have effectively changed the length of the wastegate rod of the turbo to give the LPT's more boost. Just a lil more. I don't know exactly how the mod works, and it doesn't really do much if anything for the FPT, but you can just slightly raise the boost that the LPT's top out at by doing something to that rod.
 

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Hi Hannibal and welcome .

Adding an intercooler is absolutely the right first thing to do when in search of increased performance (more in a mo...) However paying £100 is probably a bit steep unless that includes fitting.

The action of turbocharging intake air to raise it's pressure and thus force more air in the the cylinders to be burnt, thus releasing more power unfortunately brings with it the unwanted side affect of raising the temperature of the air, which lowers the density... however the intercooler when fitted cools the intake air again, thus making it denser and giving you back some of the power you would have lost.

The addition of an intercooler then will have no adverse affect on your car but does enable you to safely raise the boost a little from stock. The easiest way to do this with existing parts as Adrian says is to shorten the wastegate actuator rod. For a more readily adjustable setup, get yourself a Manual Boost Control valve and fit it inline between the compressor and wastegate actuator.
 

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Discussion Starter #5
Thanks guys for the prompt replies & all the good advice so far...

(£100 is the fitted price by the way (my local specialist is fitting the intercooler).

I've checked out the manual boost valve from AR following your advice. At less than the price of a tank of petrol that's looks like another appealing tweak!
 

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Originally posted by Hannibal:
[qb]I've checked out the manual boost valve from AR following your advice.  At less than the price of a tank of petrol that's looks like another appealing tweak! [/qb][/b]
And well worth it - IC fitted to mine, wastegate rod wound in, MBC fitted, and my LPT Aero is like a different car...(I'm going to need some bigger brakes...)
 

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Originally posted by Stunut1:
[qb] QUOTE
Originally posted by Hannibal:
[qb] I've checked out the manual boost valve from AR following your advice.  At less than the price of a tank of petrol that's looks like another appealing tweak! [/qb][/b]
And well worth it - IC fitted to mine, wastegate rod wound in, MBC fitted, and my LPT Aero is like a different car...(I'm going to need some bigger brakes...) [/qb][/b][/quote]Can you explain the process of winding the wastegate rod in to me please? I want to start tweaking my father's 900s LPT for him, but currently don't know enough about these engines to understand what you're talking about!
 

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Well you'll want to fit an intercooler or water injection before you play with boost. (If you haven't one already.) An intercooler (including installation) should run about 100 British pounds or so ... water injection can be a DIY job for about 150 pounds, or from Aquamist for about 300 pounds. Obviously since interoolers are much cheaper and more readily available that's the way to go.

Once you have an intercooler then I believe the rod has a screw on it that turns (or the whole can turns I've not played with mine). But as I'm not 100% certain you'll hafta wait for a more experienced member to post something. hopefully with pictures. *winks at C900T owners*

You also might consider things like a free-er flowing exhaust and intake. Sometimes it's better to get more power through more conventional means before hiking up the boost pressure.

Oh ... and even if you don't play with the boost pressure, and intercooler will give a significant power increase even on the stock boost, which is good because without the APC system I would hesitate to crank the pressure up too quickly. Also if you up the boost you will have to run high grade petrol. Whereas with an intercooler exhaust and intake I believe you can still run lower grade (but will have more power than you do now).

Anyway, good luck with everything! And keep on Saabin'
 

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Fitting an intercooler was going to be the first port of call, I can't believe the LPT wasn't fitted with one as standard! There usually seem to be a few on Ebay fairly cheaply, is there anywhere cheap to source the necessary pipes from? Or a retro fit kit available from the likes of Abbott Racing?

I've heard good things about Aquamist injection - a friend got a 20bhp increase running it on his supercharged VW Polo, so I'm keen to try it on mine. I mentioned it to my father, but he wasn't keen on water being pumped into his engine.
 

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I found my Intercooler at a local dealer/enthusiast for a good price, and had the wastegate tweaked and bleed valve fitted at the same time. I had been looking at Abbott but was discouraged by the prices, and some people have found that the chargecooler kit has not given as much power as they thought. I'm enormously pleased with the setup I've got for the money I paid - it certainly feels as quick as a FPT and has faster spool-up from the Mitsubishi turbo. The only drawback is no APC and no boost gauge. But the LPT's respond extremely well to tweaking.
(1991 900 S Aero ex-LPT)
 

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A cautionary note,
If your going to increase boost then makes sure that you use higher octane fuel - ie Super Unleaded,Optimax or similar.
You have no apc to fall back on as a failsafe


Pete.
 

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I always thought these weren`t the best mods? Admitedly i have one but its turned down so i shouldn`t be running silly boost. When i can afford it i will hopefully get a new actuator and boost gauge and a few apc tweaks and... and..FMIC..and...

I would prefer to rely on the apc to stop my engine going bang.
 

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Welcome to saabscene !

You could find good advices to adjust your wasgate at www.quasimotors.com
, but, agreeing with the others, you should fit first an intercooler, as it will raise heat in your engine. and don't shorten it too much, only one turn at a time ! hope that helps !

Laurent
 
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