2.5 conversion
24 January 2006, 04:07 PM
#1
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2.5 conversion
Hey there........I've decided to go for it and am getting the 2.5 bottom end with sti pistons and all the trimmings......
Now i've got a VF34 turbo and I doubt i'll be able to keep this so what turbo should I be looking at?
I'm not going for the complete 2.5 conversion but am still looking at running lower boost, more power....any suggestions?
Now i've got a VF34 turbo and I doubt i'll be able to keep this so what turbo should I be looking at?
I'm not going for the complete 2.5 conversion but am still looking at running lower boost, more power....any suggestions?
24 January 2006, 07:07 PM
#4
I think the 20g would be superb. You don't HAVE to run it at 1.4 bar...
Remember a mappable ecu will be needed.
Wish i could have a big engine...but my 2 liter is about 380 now.
Graham
Remember a mappable ecu will be needed.
Wish i could have a big engine...but my 2 liter is about 380 now.
Graham
24 January 2006, 08:07 PM
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i had a vf34 hybrid on my 2.5 but found it run out of puff at around 5500rpm.im not sure if it was the turbo or the 2.5" system.i changed over to a md321 20g with a APS 3" full decat and now have abit more low down lag,but on the plus side it pulls like a train from 3000rpm to the red line.
http://img.photobucket.com/albums/v7...y/100_0353.jpg
i forgot to mention im on the standard ecu with a remap (ecutec)
http://img.photobucket.com/albums/v7...y/100_0353.jpg
i forgot to mention im on the standard ecu with a remap (ecutec)
Last edited by R25 sti; 24 January 2006 at 08:10 PM.
24 January 2006, 10:59 PM
#6
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Ive got the EJ257 block in place running an autronics ecu and am in the process of having forged pistons and rods fitted to run over 400bhp safely......the turbo im going for is the MD321 series turbo (its the one rated to 430bhp).This is all in my V4 type-r.....
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24 January 2006, 11:10 PM
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Originally Posted by petrol magnet
i have a vf 34 on my 2.5 and it does run out of steam above 5500rpm but theres no lag.Instant power in every gear,great on the road.nice work alyn...
.
25 January 2006, 08:15 AM
#10
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If I decide to go with the 2.5 conversion, I'm planning on running the engine in with my vf34 then when it goes for mapping, changing to a TDO5 20g...
But the vf34 on my 2 litre pulls like a train to 9K...
Still looking round for the best prices on a 2.5 block with uprated rods, pistons and oil pump...
But the vf34 on my 2 litre pulls like a train to 9K...
Still looking round for the best prices on a 2.5 block with uprated rods, pistons and oil pump...
25 January 2006, 09:59 AM
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Originally Posted by Scoobyslammed
But the vf34 on my 2 litre pulls like a train to 9K...
i assume you mean 9000 RPM and not the amount of miles it has managed to do without shi*ting itself!
25 January 2006, 10:08 AM
#12
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lol, got Gems ecu with anti-lag aswell... I've personally never took it that far, but it will do it... I found the VF34 works really well on my 2 litre... But would like more eva way... if I decide to go with the 2.5, or stick with the 2 litre...
25 January 2006, 02:30 PM
#15
Not much more than with the stock pistons (450/450) but it will at least last a bit longer...the stock pistons crack their ringlands when they feel like it 
It might be possible to enter the 500's, but for how long is unknown, and then the problems with the thin bore liners and head gaskets blowing begin
It might be possible to enter the 500's, but for how long is unknown, and then the problems with the thin bore liners and head gaskets blowing begin
25 January 2006, 02:43 PM
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The way i'm looking at things is to just do the 2.5 bottom end with my VF34 for starters......after the fmic........and then around xmas time i'll go for the bigger turbo..........but i'm only aiming for 400whp otherwise i've got to start going crazy 
Best quote ever 
25 January 2006, 02:54 PM
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In long, mistaking 180's.....butlets not go there.......
anyway I say only because I know it's do-able for the 500 mark with a complete re-build and I can't make up my mind. If I go for just the bottom end, am I gonna start worring about the top end cracking......etc etc
anyway I say only because I know it's do-able for the 500 mark with a complete re-build and I can't make up my mind. If I go for just the bottom end, am I gonna start worring about the top end cracking......etc etc
25 January 2006, 03:36 PM
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Originally Posted by Tripple'O G
The way i'm looking at things is to just do the 2.5 bottom end with my VF34 for starters......after the fmic........and then around xmas time i'll go for the bigger turbo..........but i'm only aiming for 400whp otherwise i've got to start going crazy
25 January 2006, 06:06 PM
#23
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Quote...I pray to god you have altered the valvetrain somehow, to know that it will happily rev to 9k!!!!
All I can say is, i'll keep you posted... as engine is being stripped for inspection in 2 weeks...
All I can say is, i'll keep you posted... as engine is being stripped for inspection in 2 weeks...
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