Max bhp
19 April 2009, 12:47 PM
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Max bhp
Hi guys made a start on a engine rebuild an spec is as follows
V9 crank
Steel rods
rcm water pump
rcm oil pump
rcl race bearings
arp bolts and studs
mahle piston rings
All of this is going to a low millage p1 casings with exclent bores and pistons.What would the max bhp of the std sti pistons,only im looking at around the 400 figure and the pistons being forged I would expect them to.The whistler is a hybred gt3078r brand fire new, apexi pfc,fmic,550 injectors.Would like your views about pistons cheers Andy
V9 crank
Steel rods
rcm water pump
rcm oil pump
rcl race bearings
arp bolts and studs
mahle piston rings
All of this is going to a low millage p1 casings with exclent bores and pistons.What would the max bhp of the std sti pistons,only im looking at around the 400 figure and the pistons being forged I would expect them to.The whistler is a hybred gt3078r brand fire new, apexi pfc,fmic,550 injectors.Would like your views about pistons cheers Andy
19 April 2009, 12:54 PM
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19 April 2009, 01:14 PM
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Yes, forged and forged, design and materials used, doesnt matter if its forged, lower grade materials and bad design make them considerably weaker.
To the OP, there is a reason an STI "forged" piston is considerably cheaper than say a cosworth forged piston
Tony
To the OP, there is a reason an STI "forged" piston is considerably cheaper than say a cosworth forged piston
Tony
21 April 2009, 01:05 PM
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21 April 2009, 01:13 PM
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Can you explain the differences between "forged" and "FORGED"? (apart from CAPS lock).
Can you alos post up comparative costs for the differing pistons.
Can you alos post up comparative costs for the differing pistons.
21 April 2009, 01:21 PM
#9
The way I understand it is that the STi rods and pistons, although forged, aren't really 'worthy' of the name.
Presumably, it's a typically mass-produced, cost-cutting 'half-hearted' attempt at doing it.
Contact APIDavid - he'll tell you some interesting stories of STi internals
...
Presumably, it's a typically mass-produced, cost-cutting 'half-hearted' attempt at doing it.
Contact APIDavid - he'll tell you some interesting stories of STi internals
...
21 April 2009, 01:25 PM
#10
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Why should I contact API, I have had no running issues with mine for them last 2 years.
GRD are managing to run in excess of 500bhp on standard internals. There appears to be confusion about what pistons are in what model and age.
GRD are managing to run in excess of 500bhp on standard internals. There appears to be confusion about what pistons are in what model and age.
21 April 2009, 04:41 PM
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Luckily the driver had plently of time to get out, thats what 500bhp does on standard internals
Tony
21 April 2009, 05:00 PM
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My only concession to the increased power is to change the oil and filter every 3-4000 miles or so.
Last edited by lunar tick; 21 April 2009 at 05:01 PM.
21 April 2009, 08:25 PM
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Running 500bhp and running 500bhp reliably are 2 different things, hence why people dont normally exceed 400bhp in the new age cars, on the other hand there was a nice thread not long back with a 500bhp standard internalled JDM MY01/02 plate that quite nicely exploded and quickly burnt out on the motorway when the engine let go catastrophically
Luckily the driver had plently of time to get out, thats what 500bhp does on standard internals
Tony
Luckily the driver had plently of time to get out, thats what 500bhp does on standard internals
Tony
My advice has always been that, if you are happy to accept that something could go wrong (Regardless of spec) and just move on from it if it does, then push it and see how for it'll go !
21 April 2009, 08:33 PM
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What MartynJ say is correct - I've already done over 13k on my new age since I took her over 400 and its is fine.
22 April 2009, 04:42 PM
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400bhp+ has been considered safe on Newage Sti's for quite a while now, four of ours (Including our good friend JD's) have been running in excess of 450hp for over 2 years without issue. The right components, careful mapping and regular servicing have all contributed to this.
My advice has always been that, if you are happy to accept that something could go wrong (Regardless of spec) and just move on from it if it does, then push it and see how for it'll go !
My advice has always been that, if you are happy to accept that something could go wrong (Regardless of spec) and just move on from it if it does, then push it and see how for it'll go !
but thats not the point, its not a new age engine the OP is talking about Tony
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