how much can a standard 2.5 take
27 February 2013, 09:50 PM
#1
how much can a standard 2.5 take
As titled, im onabout a standard straight from the factory 2.5 engine, not looking for more than 350 just want a fast/torquey road car, currently got a 2.0 with td05 16g but its a bit laggy for me
27 February 2013, 10:18 PM
#5
Lol you waited a full 16 minutes between bumps lol,
The 2.5 can have head gasket troubles. It's a lot torquier than the 2.0 how ever,
People tend to forge the pistons, cops worth head gaskets and head bolts. And the. Your safe to map up to 380 with the standard turbo
The 2.5 can have head gasket troubles. It's a lot torquier than the 2.0 how ever,
People tend to forge the pistons, cops worth head gaskets and head bolts. And the. Your safe to map up to 380 with the standard turbo
27 February 2013, 10:33 PM
#7
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There used to be a saying when people said uninformed things, "you watch too much tv". I think the modern version is "you read to many internet opinions" 
Many always say the 2.5 is made of chocolate ect but they have never owned or driven one. Their comments come from things they have read from anonymous forum posters. You can tell because they just come out with off the cuff comments rather than informed fact and detail.
There are two types of 2.5 impreza engine, the ej255 wrx and the sti ej257. The wrx is not known for many problems and i believe 350bhp is fine but it does have the weaker 5 speed box.
The early sti 2.5 2006 had the earlier head gasket which was revised in the 2007 engines. the 2008 on had ringland issues which prompted subaru to revise the map which seemed to solve the problem on standard cars.
The ppp map to 316 bhp was said to be 10% below the engines limit on standard internals. There are many 2.5 cars that have achieved high trouble free mileage but like most cars if you read forums there will be reports of failures. Personally i would not go above 360bhp unless you have forged pistons and 11mm head studs as a minimum.
Internet forums are much like the press in general. You only read horror storys.
Many always say the 2.5 is made of chocolate ect but they have never owned or driven one. Their comments come from things they have read from anonymous forum posters. You can tell because they just come out with off the cuff comments rather than informed fact and detail.
There are two types of 2.5 impreza engine, the ej255 wrx and the sti ej257. The wrx is not known for many problems and i believe 350bhp is fine but it does have the weaker 5 speed box.
The early sti 2.5 2006 had the earlier head gasket which was revised in the 2007 engines. the 2008 on had ringland issues which prompted subaru to revise the map which seemed to solve the problem on standard cars.
The ppp map to 316 bhp was said to be 10% below the engines limit on standard internals. There are many 2.5 cars that have achieved high trouble free mileage but like most cars if you read forums there will be reports of failures. Personally i would not go above 360bhp unless you have forged pistons and 11mm head studs as a minimum.
Internet forums are much like the press in general. You only read horror storys.
Last edited by chopperman; 27 February 2013 at 10:35 PM.
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27 February 2013, 10:34 PM
#8
Lol I get very impatient lol, well how much can I get a 2.5 block for itself? I could build it up with uprated parts, im not really for more than a engine thats capable off 400 but il keep it at 359 to keep it safe and jist want a nice spooly/torquey car for the road, atm my 2.0 on td05 16g doesnt really do much below 3k rpm and ive just come off a td04 which is spooly!!
27 February 2013, 10:41 PM
#9
There used to be a saying when people said uninformed things, "you watch too much tv". I think the modern version is "you read to many internet opinions"
Many always say the 2.5 is made of chocolate ect but they have never owned or driven one. Their comments come from things they have read from anonymous forum posters. You can tell because they just come out with off the cuff comments rather than informed fact and detail.
There are two types of 2.5 impreza engine, the ej255 wrx and the sti ej257. The wrx is not known for many problems and i believe 350bhp is fine but it does have the weaker 5 speed box.
The early sti 2.5 2006 had the earlier head gasket which was revised in the 2007 engines. the 2008 on had ringland issues which prompted subaru to revise the map which seemed to solve the problem on standard cars.
The ppp map to 316 bhp was said to be 10% below the engines limit on standard internals. There are many 2.5 cars that have achieved high trouble free mileage but like most cars if you read forums there will be reports of failures. Personally i would not go above 360bhp unless you have forged pistons and 11mm head studs as a minimum.
Internet forums are much like the press in general. You only read horror storys.
Many always say the 2.5 is made of chocolate ect but they have never owned or driven one. Their comments come from things they have read from anonymous forum posters. You can tell because they just come out with off the cuff comments rather than informed fact and detail.
There are two types of 2.5 impreza engine, the ej255 wrx and the sti ej257. The wrx is not known for many problems and i believe 350bhp is fine but it does have the weaker 5 speed box.
The early sti 2.5 2006 had the earlier head gasket which was revised in the 2007 engines. the 2008 on had ringland issues which prompted subaru to revise the map which seemed to solve the problem on standard cars.
The ppp map to 316 bhp was said to be 10% below the engines limit on standard internals. There are many 2.5 cars that have achieved high trouble free mileage but like most cars if you read forums there will be reports of failures. Personally i would not go above 360bhp unless you have forged pistons and 11mm head studs as a minimum.
Internet forums are much like the press in general. You only read horror storys.
27 February 2013, 10:50 PM
#12
Depends what your used to. I've had a lot of Leon cupra r and the spool really quick, that's why I personally don't like the 2.0 engine. Personal opinion it's laggy as hell
27 February 2013, 11:06 PM
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27 February 2013, 11:35 PM
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Back in 2006 ran a 2.5 Wrx at 419hp. Its still running now.
However the pistons are a little hit and miss and fail sometimes on standard power.
Generally class 380bhp as sensible. 350 bhp should be a problem.
Simon
However the pistons are a little hit and miss and fail sometimes on standard power.
Generally class 380bhp as sensible. 350 bhp should be a problem.
Simon
27 February 2013, 11:39 PM
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The vf43 can go to about 380-390 bhp. Maybe a bit less if like me you run a sport cat rather than de-cat. Just be strict on running 99ron as standard pistons are not detonation resistant. If you can get your hands on a forged car or strike a deal when buying that allows for you to get forged then you will have a great car. If you want over 500 then the 2.5 is not the engine to go for really.
28 February 2013, 07:51 AM
#20
If on standard internals keep it below 360bhp. Get it mapped for torque. i have the ecutek racerom by Bob Rawle. I make my max torque at 3200rpm and max bhp at 4200 rpm. Makes for a car that pulls very low down without revving the nuts off it. i hold the power right to the red line with the torque starting to drop off slightly at about 5500rpm. You would be looking at around 440 ft/lb or torque The vf43 can go to about 380-390 bhp. Maybe a bit less if like me you run a sport cat rather than de-cat. Just be strict on running 99ron as standard pistons are not detonation resistant. If you can get your hands on a forged car or strike a deal when buying that allows for you to get forged then you will have a great car. If you want over 500 then the 2.5 is not the engine to go for really.
The vf43 can go to about 380-390 bhp. Maybe a bit less if like me you run a sport cat rather than de-cat. Just be strict on running 99ron as standard pistons are not detonation resistant. If you can get your hands on a forged car or strike a deal when buying that allows for you to get forged then you will have a great car. If you want over 500 then the 2.5 is not the engine to go for really.
28 February 2013, 08:44 AM
#25
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mines been rebuilt with rods and pistons and will get taken up to 450 once all supporting mods been added, i wouldn;t go more than decat and map on the standard engine myself.
on a slight side note im not actualy sure what made the engine let go in mine (bought it with rebuilot engine) shall ask the question i think.
on a slight side note im not actualy sure what made the engine let go in mine (bought it with rebuilot engine) shall ask the question i think.
28 February 2013, 08:52 AM
#29
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mines been rebuilt with rods and pistons and will get taken up to 450 once all supporting mods been added, i wouldn;t go more than decat and map on the standard engine myself.
on a slight side note im not actualy sure what made the engine let go in mine (bought it with rebuilot engine) shall ask the question i think.
on a slight side note im not actualy sure what made the engine let go in mine (bought it with rebuilot engine) shall ask the question i think.
What was the failure?
28 February 2013, 08:57 AM
#30
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, fired up for the first time on monday, it's alive, its alive!!!!! 