did the early sti's have forged pistons?
29 November 2008, 12:49 PM
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did the early sti's have forged pistons?
well i was always told they did.
so i paid for a set of sti v4 pistons for my uk.
side by side, they did shine alot more.
so was i told right, or it the person on her told me wrong....
when i looked into getting the pistons. i asked on here, and was told only the sti v2 onwards had these forged type.
advice please guys
so i paid for a set of sti v4 pistons for my uk.
side by side, they did shine alot more.
so was i told right, or it the person on her told me wrong....
when i looked into getting the pistons. i asked on here, and was told only the sti v2 onwards had these forged type.
advice please guys
29 November 2008, 05:43 PM
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29 November 2008, 06:43 PM
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right then, that clears that up.
they are forged, but they will take less power than the performance pistons wich will take 600+
well, i can amend what i said then.
thanks guys
they are forged, but they will take less power than the performance pistons wich will take 600+
well, i can amend what i said then.
thanks guys
29 November 2008, 09:02 PM
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when i changed the pistons, the rods in my uk engine were the same as the sti ones. well at least the engine will take what im after.
mapping here we come.
mapping here we come.
29 November 2008, 09:19 PM
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You know, I read a book about impreza's and that said the V1 was just a retuned WRX, standard cast pistons but different ecu map (240ps standard on a wrx, 250ps on the v1 or STi as it was known as).
The car was just removed off the production line and had a few goodies added, but the book stated the engine was still the wrx engine (but you probably have a closed deck block though
).
Tony
The car was just removed off the production line and had a few goodies added, but the book stated the engine was still the wrx engine (but you probably have a closed deck block though
).Tony
29 November 2008, 09:51 PM
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the pistons were out of a sti v4, and my engine is a uk. which is the same as the wrx, open deck.
my engine is almost every thing sti, bar the heads, still the uk ones. pistons injectors ect, even the headers are sti.
i was told also that the sti v1 was almost standard apart from the closed deck. and that forged pistons started on the sti v2, so i was after pistons from a v2 onwards. but got sti v4 ones in the end. and re did the engine my self, uprating most parts to take more power
my engine is almost every thing sti, bar the heads, still the uk ones. pistons injectors ect, even the headers are sti.
i was told also that the sti v1 was almost standard apart from the closed deck. and that forged pistons started on the sti v2, so i was after pistons from a v2 onwards. but got sti v4 ones in the end. and re did the engine my self, uprating most parts to take more power
29 November 2008, 10:37 PM
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I have a V1 and it has forged pistons!! Now i stripped the car down last year to rebuild the engine and found std forged subaru pistons in the closed deck block. Now whether these were added after it was born i could not say but i have owned the car 5 years now so they could have easily been fitted in Japan. I did note however that when i stripped the engine it looked like it had never been opened up but who knows!
There is all sorts of conflicting stuff on the net about the so called V1 blueprinted engine all sorts only sti know for sure what they did. They also say the stock ecu was 250ps and 310lbsft torque!
There is all sorts of conflicting stuff on the net about the so called V1 blueprinted engine all sorts only sti know for sure what they did. They also say the stock ecu was 250ps and 310lbsft torque!
29 November 2008, 10:46 PM
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The stock ecu would never produce 310lbs on the original STI, think it was more like 240lbs, even the v4/5/6 cars only produced around 256lbs, but the book I read had information direct from subaru in it 
Tony
Tony
29 November 2008, 10:48 PM
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29 November 2008, 11:12 PM
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Agree Tony, although it would be nice to have that torque lol. Im not convinced it was only 250ps either! Ive had my ecu open no chip or board in it, my mates car has a proven 311 at the fly but he cant get close to me im 4/5 car lengths ahead. I keep meaning to get it on the rollers!
Too much conflicting stuff on the forums to know exactly what the first sti had in it!
Too much conflicting stuff on the forums to know exactly what the first sti had in it!
29 November 2008, 11:19 PM
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Just found this, bold statements being made!
PRO SHOW CAR: STI V1 IMPREZA. Very LOW MILEAGE GTR GTS on eBay, also, Subaru, Cars, Cars, Parts Vehicles (end time 30-Nov-08 16:49:02 GMT)
PRO SHOW CAR: STI V1 IMPREZA. Very LOW MILEAGE GTR GTS on eBay, also, Subaru, Cars, Cars, Parts Vehicles (end time 30-Nov-08 16:49:02 GMT)
30 November 2008, 03:43 AM
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Oh well, looks like im wrong
Straight from the horses mouth as they say
Just click introduction when your in STI GLOBAL
The Impreza that had first appeared in November 1992 was entered in the WRC from the middle of the 1993 season. In order to take the fight to the might of the European veterans, the development of the model was ramped up, even though it was an Impreza running the standard 240PS power output. Based on the turbo "WRX" model, the "WRX STI" , featuring engines tuned by STI, had forged pistons, an exclusive ECU and large-diameter exhaust, and was announced in January 1994. This car showed an improvement in power output to 250PS, with all the one-at-a-time hand built machines instantly snapped up on order. In October of 1994, the Impreza underwent minor changes. With these changes came the "Drivers Control Centre Differential" (so called DCCD or EMCD) additionally installed. There also appeared an STI version, with a power increase to 275PS and featuring a reinforced cylinder head and an improvement in the turbo's supercharging pressure. This created a huge boom for the car. With this success came a limited model in 1995, called the version II. The car then became a mass-produced model available in the regular model catalogue. Following this success, there was an STI version III launched in 1996, featuring 280PS. The car kept evolving, the STI version of the GC8-shape first generation Impreza culminating in 1999 with the VI version.
Straight from the horses mouth as they say
Just click introduction when your in STI GLOBAL
The Impreza that had first appeared in November 1992 was entered in the WRC from the middle of the 1993 season. In order to take the fight to the might of the European veterans, the development of the model was ramped up, even though it was an Impreza running the standard 240PS power output. Based on the turbo "WRX" model, the "WRX STI" , featuring engines tuned by STI, had forged pistons, an exclusive ECU and large-diameter exhaust, and was announced in January 1994. This car showed an improvement in power output to 250PS, with all the one-at-a-time hand built machines instantly snapped up on order. In October of 1994, the Impreza underwent minor changes. With these changes came the "Drivers Control Centre Differential" (so called DCCD or EMCD) additionally installed. There also appeared an STI version, with a power increase to 275PS and featuring a reinforced cylinder head and an improvement in the turbo's supercharging pressure. This created a huge boom for the car. With this success came a limited model in 1995, called the version II. The car then became a mass-produced model available in the regular model catalogue. Following this success, there was an STI version III launched in 1996, featuring 280PS. The car kept evolving, the STI version of the GC8-shape first generation Impreza culminating in 1999 with the VI version.
30 November 2008, 07:32 AM
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I have a V1 and it has forged pistons!! Now i stripped the car down last year to rebuild the engine and found std forged subaru pistons in the closed deck block. Now whether these were added after it was born i could not say but i have owned the car 5 years now so they could have easily been fitted in Japan. I did note however that when i stripped the engine it looked like it had never been opened up but who knows!
There is all sorts of conflicting stuff on the net about the so called V1 blueprinted engine all sorts only sti know for sure what they did. They also say the stock ecu was 250ps and 310lbsft torque!
There is all sorts of conflicting stuff on the net about the so called V1 blueprinted engine all sorts only sti know for sure what they did. They also say the stock ecu was 250ps and 310lbsft torque!
30 November 2008, 09:43 AM
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Plenty of early WRX had closed deck blocks, not just the STi models. Rods are the same from WRX to STi throughout the 'classic' era. Pistons were the only difference between WRX and STi within the actual crankcase, and I'm not sure when they changed over to being cast vs forged but certainly at v3 onwards, STi was forged, WRX was cast.
The big differences were in STi heads vs WRX heads.
The big differences were in STi heads vs WRX heads.
30 November 2008, 09:57 AM
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i was told that, and found it true to.
but the ecu i have does have at the min an esl daughter board.
but with the td05 turbo/front mount. it kicking 277bhp.
but needs mapping. once this is done with in the next couple of weeks, including the esl live map thing
will be around 310/330
i got the pistons for strengh. multi layer gaskets, + other bits.
but the main thing i just wanted to know was the pistons, as some one posted on a htread of mine. telling me they were never forged...
to which the sti v4 pistons were.
but as this thread has some interesting facts. i can know upgrade the turbo to a 18g, and 550cc injectors. and the engine will still be happy
well, thanks for all the replys guys.
but the ecu i have does have at the min an esl daughter board.
but with the td05 turbo/front mount. it kicking 277bhp.
but needs mapping. once this is done with in the next couple of weeks, including the esl live map thing
will be around 310/330
i got the pistons for strengh. multi layer gaskets, + other bits.
but the main thing i just wanted to know was the pistons, as some one posted on a htread of mine. telling me they were never forged...
to which the sti v4 pistons were.
but as this thread has some interesting facts. i can know upgrade the turbo to a 18g, and 550cc injectors. and the engine will still be happy
well, thanks for all the replys guys.
