EJ257 Built, what heads are better?, UK98 or STI 2
04 February 2007, 02:24 PM
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EJ257 Built, what heads are better?, UK98 or STI 2
I am building a EJ257 for my Euro GT98
, what heads are better for this block?.
- Euro 98 Heads (211 hp)
- JDM WRX 95-96 (260 hp)
- JDM STI V2 96 (275 hp)
I know that the best ones are the STI V3-V4 but they are very difficult to find.
, what heads are better for this block?.- Euro 98 Heads (211 hp)
- JDM WRX 95-96 (260 hp)
- JDM STI V2 96 (275 hp)
I know that the best ones are the STI V3-V4
but they are very difficult to find.
04 February 2007, 09:25 PM
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the 95~96WRX are the worse of the three.
The UK98 have good cams but only hydraulic tappets..
the Sti2 have solid lifters etc.. so can rev but not 100% sure how wild the cams are compared to the UK98 which I know are reasonable.
I would probably plumb for Sti2 given that choice.
The alternative - depending on how much work you are willing to do / have done.. go for phase 2 heads whcih are easier to come by and get an inlet manifold altered to fit..
Simon
The UK98 have good cams but only hydraulic tappets..
the Sti2 have solid lifters etc.. so can rev but not 100% sure how wild the cams are compared to the UK98 which I know are reasonable.
I would probably plumb for Sti2 given that choice.
The alternative - depending on how much work you are willing to do / have done.. go for phase 2 heads whcih are easier to come by and get an inlet manifold altered to fit..
Simon
05 February 2007, 09:54 AM
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Assuming that the EJ257 won't be going past 7.5k rpm I don't think there will be much gained/lost between the UK98 and STI2 heads.
Whichever option is available 1st IMO
Whichever option is available 1st IMO
05 February 2007, 01:14 PM
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05 February 2007, 05:35 PM
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talking about heads and 2.5's
is there any issue using 2 litre heads on a 2.5 with regards gaskets and compression ratios
is it best to get the chambers altered
is there any issue using 2 litre heads on a 2.5 with regards gaskets and compression ratios
is it best to get the chambers altered
05 February 2007, 09:41 PM
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the 95~96WRX are the worse of the three.
The UK98 have good cams but only hydraulic tappets..
the Sti2 have solid lifters etc.. so can rev but not 100% sure how wild the cams are compared to the UK98 which I know are reasonable.
I would probably plumb for Sti2 given that choice.
The UK98 have good cams but only hydraulic tappets..
the Sti2 have solid lifters etc.. so can rev but not 100% sure how wild the cams are compared to the UK98 which I know are reasonable.
I would probably plumb for Sti2 given that choice.
If it must be phase 1, and you can't find a set of Sti 2 RA, or Sti 3/4 heads then stick with the UK ones...or get them ported and flowed and do what ever you like
As for Chambers, ideally you want to relieve the edges a bit or better still open them out to suit the larger bore...
05 February 2007, 09:44 PM
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I thought the uk 98 was the same cast and flow as the sti 3 just different running gear.
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