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1995 STi Type RA tune

Old 20 January 2019, 04:06 PM
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Scooby95RA
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Default 1995 STi Type RA tune

Looking for the best "bang for your buck" ways of tuning a 95 STi RA. Already has some mods from a prev owner (ie 22psi, dog box tranny, full roll cage, endless pads and rotors, skid plates, tein flex z with active pro) I believe mostly stock internals. I estimate right now about 310-315 at the wheels and 370 at the crank. Not sure if an ECU tune has ever been done. Any thoughts or tips would be helpful.
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Old 20 January 2019, 04:39 PM
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Pete
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Well firstly if it’s stock internals @ 370 it’ll not last long, lol.
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Old 20 January 2019, 04:44 PM
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Well, whoever had it before me took good care of it and mechanically it's very sound for a 20+ y.o. car. Though at some point I will get it overhauled. Looking to get a port and polish done though first to get a look at the internals a little better. I'm at about 146,000km right now.

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Old 20 January 2019, 04:46 PM
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Yes just get a good health check done, fueling etc. Are you still on the 5 speed OE box too??

Post some pics up of the old girl
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Old 20 January 2019, 04:49 PM
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No, prev owner put a dog box in it. still have the OEM tranny and gearset though.
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Old 20 January 2019, 05:10 PM
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Originally Posted by Pete View Post
Yes just get a good health check done, fueling etc. Are you still on the 5 speed OE box too??

Post some pics up of the old girl
Once I get out of work I will. Don't have any pics on me at the moment.
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Old 20 January 2019, 06:34 PM
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Note then likely 310 at the crank
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Old 20 January 2019, 06:41 PM
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Originally Posted by RAGGY DOO View Post
Note then likely 310 at the crank
I haven't had it on dyno yet. I would estimate more as I am pushing 22lbs of boost when stock is only around 15-16 for the MY95 STI RAs. You figure on rough estimate 1 psi = 15hp added to stock (271bhp) and it works out to roughly 370bhp figure between 20-25% loss in the powertrain and it comes out to over 300whp. Just guestimates, but it feels like well over 300.
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Old 20 January 2019, 07:08 PM
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*note this is a JDM spec STI RA I am referring to, not sure if the Euro / Aus Spec cars are different. Any of yuinz know?
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Old 21 January 2019, 08:58 AM
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on the std turbo for that age of car (TD05-16G) and without supporting mods like larger injectors, fuel pump, higher target MAP sensor, etc. then they struggle to do early 300's and approx 340-350 once all completed

what other mods (if any) doe it have??
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Old 21 January 2019, 11:51 AM
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as above unless it's hard the turbo switched out it's unlikely to be much over 330hp at the crank, the cars lack of weight usually makes them fairly rapid to drive tho at that level.

Pop the ECU cover off and see if its been fitted with a chip/daughter board already, if not then handiest way to go is usually an ESL board fitted and mapped to suit.
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Old 22 January 2019, 10:02 AM
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Originally Posted by Pete View Post
Yes just get a good health check done, fueling etc. Are you still on the 5 speed OE box too??

Post some pics up of the old girl

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Old 22 January 2019, 05:24 PM
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MY95 - 96 STI

Standard Injectors are 380cc Grey, Will struggle to get over 300ish - Common 1st stage mod is 440cc Yellow, good for 330 ish with upgraded fuel pump and fuel pressure regulator.
Standard Slanted TMIC Good for 300ish (maybe).
Standard Catted downpipe might allow 300ish.
Standard 95/96 Cylinder heads with hydraulic cam lifters not good for high revs and factory cams are "mild" and they will have trouble keeping up at high revs.
Standard Cast pistons and the stud and nut conrods are not the best design for big power - On borrowed time at 300ish.
Standard TD05 is a very capable turbo and good for 330bhp with supporting modifications.

All these parts are now 140k miles 24 years old so I would leave alone if original.

I own a 96 sti type ra currently making 390 but theres very little left of the standard engine, in its previous state of tune it made 330 at the crank with all of the above either modified or uprated parts. ESL daughter boards are the most cost-efficient ECU upgrade for these early cars.

If someone went to the trouble and expense of fitting a dog box, I would have thought they would have rebuilt the engine to a higher than factory spec. Maybe get some pics of the engine bay and we might be able to comment further?

Im not normally a fan of cars with Decals but I like the grey on white
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