what is my 96 wrx bottom end/piston able to handle?
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engines are amazing things as long as they are warmed up corectly, kept in good oil and water, ran on quality fuel and are not asked to make too much power for a sustained time.
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Be aware that the gearbox will no doubt be on borrowed time over 360bhp though! See the note at the bottom of the level 3 tune:-
http://www.andyforrestperformance.co.uk/58637.html
Personally, I would be happier running the early TY752 5-sp at <340bhp!...
Obviously, driving style/how you treat the 'box accounts for a lot though. Plus there is the element of 'luck' too...
http://www.andyforrestperformance.co.uk/58637.html
Personally, I would be happier running the early TY752 5-sp at <340bhp!...
Obviously, driving style/how you treat the 'box accounts for a lot though. Plus there is the element of 'luck' too...
Last edited by joz8968; 05 April 2011 at 12:36 PM.
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Don't forget that the WRX doesn't have 'forged' pistons (even then, the MY94-96 STi's "dogbone" forged ones aren't exactly that 'great' either). Plus, the bearings won't exactly be fresh as daisies on an original MY96 bottom end.
I agree with Tidgy and timmy.
I agree with Tidgy and timmy.
Last edited by joz8968; 05 April 2011 at 12:50 PM.
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this always amazes me. Fuji Heavy Industries invested tens of million of dollars designing and engine that was capable of 260 horsepower. tolerance allowances for say 10 - 15 % would make that about 300 horsepower. yet people reckon they can get 400 horsepower (an increase of nearly 54%) out of and enfine designed for 260.
They then wonder why the engine fails and gearboxes are spat out?
They then wonder why the engine fails and gearboxes are spat out?
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Bit off topic as mines a uk turbo. I ran mine at 385bhp for two years before mine started knocking on big ends. Engine was totally standard. Gearbox lasted 2 wks, so ended up having 6 SPd fitted. There is a certain amount of luck involved I'm sure. I would say you ate better arroubd the 300 mark. Gearbox and engine will be under less stress, and it will still be a very respectable road car none the less.
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the most i want out of the engine is 350, i will be more than happy with 320bhp. i know the engine wont last forever as its already 15years old!! currently running around 290bhp but would like a little more
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Really need a FMIC, and at least 440cc injectors, for 320+ (I'd fit 550s though, if it was me).
Also, a Walbro 255; cone filter (if fitting a FMIC); NGK PFR7 plugs; and possibly a later MY99/00 MAP sensor. Finally a remap (I assume you're already currently running a mappable ECU if you're already at c.290...?)
Last edited by joz8968; 05 April 2011 at 05:16 PM.
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I ran my WRX Wagon MY95 at 385 bhp for a long period and with methanol we had a few runs over 400 bhp but when quoting these figures a lot depends on what rolling road(s) you are using. The engine ran like this no problem. I then fitted STi pistons and forged rods and ran at 420 bhp for a long time with no difficulty.
As already pointed out, your gearbox will give up the ghost before a well looked after engine running 380 bhp.
As already pointed out, your gearbox will give up the ghost before a well looked after engine running 380 bhp.
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