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12 August 2008, 00:06 wrx287 Scooby Regular Join Date: Aug 2007 Location: In search of more power!! Posts: 1,166	BIG POWER BUILD Just a quick question guys. Would it be possible to build a 2.5 that could reliably handle 550-600bhp? Im thinking of doing a build over a year or so, would this be achieveable? Obviously be doing gearbox,brakes,suspension etc to cope wrx287 is thinking of going for a full WRC style interior
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12 August 2008, 00:26 frayz frayz-engineering Join Date: Sep 2005 Location: Way out in front!!, wheels spinnin, flame spittin, turbo spoolin!!!........ On the quest for 450/450 Posts: 13,290

RCM Gobstopper. As far as im aware that car has run circa 800bhp for over 3 seasons now without a rebuild. Someone may correct me if im wrong. Id say its do-able, speak to teh guys at Area52 Autosport for bombproof big bhp builds. They did a WR1 made to reliably run 550bhp in cyprus on pump gas. __________________ FORGED 2.5 UNDER CONSTRUCTION GT30, Tial, Fuelab, APS DR725, GT Spec, Exedy Hyper, Innovate, KWs, AP Racing, Whiteline, Noltec, Recaro, Speedline, Simpson & Carbon galore!!... frayz is forwards, backwards, 180, downturn backwards 180, 360 left, 360 right, kiteside 180, backside 180, backside 360, 2 wheels, 2 wheels one handed, 2 wheels 1 handed fotout, and arials. Blade IVs... and freestyle buggy. NO SPREADSHEETS QUEER!

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12 August 2008, 01:35 Mocom Racing Track prep specialist Join Date: Feb 2005 Location: M11 junction7 01992 570572 Posts: 672

Quote: Originally Posted by frayz RCM Gobstopper. As far as im aware that car has run circa 800bhp for over 3 seasons now without a rebuild. Someone may correct me if im wrong. Id say its do-able, speak to teh guys at Area52 Autosport for bombproof big bhp builds. They did a WR1 made to reliably run 550bhp in cyprus on pump gas. Frayz the RCMS car, although a wonderful feet of engineering, is not a 2.5 Has the Area52 car secured any points in the Time Attack; surely the proving ground for any tuning company? My car runs close to 480ftlbs on the road yet this has to be lowered to less than 400ftlbs for sustained track use (with STi TIMC), I can happily make the numbers for a one off dyno print out with the T. Didn't Andy claim 600ftlbs at one point, no doubt achieveble, but sustainable? __________________ Brakes from AP, Ferodo, Performance Friction Suspension by KW, KYB, Moton, Noltec & Whiteline Performance by Mocom Racing Mocom Racing is Mapping Adaptronics, Apexi Power FC, ESL, GEM's, Hydra, Simtek and Subaru ECU's and currently has 13 points in the 'Time Attack' after 3 rounds

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12 August 2008, 01:39 frayz frayz-engineering Join Date: Sep 2005 Location: Way out in front!!, wheels spinnin, flame spittin, turbo spoolin!!!........ On the quest for 450/450 Posts: 13,290

Sorry, i missed the 2.5 part. Yes the RCM gobstopper is a 2.35 AFAIK. He didnt say he wanted to compete in it. He said he wanted a bhp figure that was reliable mate. IMO a car running that sort of power to be used as a DD in Cyprus on pump gas is a pretty good testament to the build. Maybe if the OP clarifies what he/she intends to use the car for, their questions maybe easier to answer more accurately. __________________ FORGED 2.5 UNDER CONSTRUCTION GT30, Tial, Fuelab, APS DR725, GT Spec, Exedy Hyper, Innovate, KWs, AP Racing, Whiteline, Noltec, Recaro, Speedline, Simpson & Carbon galore!!... frayz is forwards, backwards, 180, downturn backwards 180, 360 left, 360 right, kiteside 180, backside 180, backside 360, 2 wheels, 2 wheels one handed, 2 wheels 1 handed fotout, and arials. Blade IVs... and freestyle buggy. NO SPREADSHEETS QUEER!

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12 August 2008, 07:27 banny sti Scooby Senior Join Date: Oct 2004 Location: Pennine Subaru 01422845007 and Lateral Performance Posts: 5,427 View My Scooby	Afaik the gobstopper is still a 2 litre engine. Banny
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12 August 2008, 08:49 Badbird Scooby Regular Join Date: Jun 2008 Location: Essex Posts: 257

RCM dont recomend over 2 litre for big hp We are going for a 600 hp build and are using a 2 litre block, filled with RCMS parts, there are so many experts with so many oppinions, none of them wrong ,just arrived at through personal experience, so its up to you who you beleive, but for me the RCM gobstopper is a testiment to sound engineering, I chose to follow their advise, Badbird thinks you should all buy American car world magazine and see a real badbird in the centre pages

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12 August 2008, 10:38 E_M_B Scooby Regular Join Date: Nov 2006 Posts: 872

Quote: Originally Posted by wrx287 Just a quick question guys. Would it be possible to build a 2.5 that could reliably handle 550-600bhp? Im thinking of doing a build over a year or so, would this be achieveable? Obviously be doing gearbox,brakes,suspension etc to cope Why do you want 550-600 bhp? Are you going for competition of some sort, or is it to be a road car, or do you just want to brag about power figures down the pub...? If you want a quick road car, go the 2.5 route, with 450-500 ish of both power and torque. For competition stick with 2.0/2.2 CDB plus usual internals... Just my 2 pence worth.

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12 August 2008, 10:39 dazdavies Scooby Regular Join Date: Oct 2000 Location: In the garage again!! New Project Underway. Posts: 2,461	In a word yes, I'm part way through doing just the thing. Start with a closed deck 2.0L Block Have it bored and sleeved to 2.5. Here's some pics of the work in progress Top Hat Steel liners Here's the engineers diagram of the liners The Block itself It's got these rods and pistons inside dazdavies wants to be covered in chocolate and thrown to the lesbians.
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12 August 2008, 10:48 wrx287 Scooby Regular Join Date: Aug 2007 Location: In search of more power!! Posts: 1,166	The car is going to be mainly used as a weekend play thing and the odd track day. But if it could be made reliable at about 500-550bhp i would be more than happy wrx287 is thinking of going for a full WRC style interior
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12 August 2008, 12:33 MonkiP1 Scooby Regular Join Date: Feb 2007 Location: Bristol Posts: 198 View My Scooby	I say fair play, a chap on the forum I am apart of has his Scooby very close to 600bhp, Its his toy and track car. Quality build and all the mod cons, as at that bhp Traction is a major factor
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12 August 2008, 16:53 p060064h Scooby Regular Join Date: Mar 2008 Location: The boot of my car. Posts: 173	mine is igetting a 2.5 transplant at the mo and they say its going to have 530bhp and over 550ftlbs or even more now they have decided to do a twisted turbo. they reasure me its going to be totaly realiable. and the original gearbox can take over 650bhp. so yes it will take that power
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12 August 2008, 17:33 dazdavies Scooby Regular Join Date: Oct 2000 Location: In the garage again!! New Project Underway. Posts: 2,461	Have they sleeved the 2.5 block? dazdavies wants to be covered in chocolate and thrown to the lesbians.
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12 August 2008, 18:37 merlin24 Scooby Regular Join Date: May 2006 Location: CARBON FOOTPRINT - MY ARSE!! Posts: 1,008	Quote: Originally Posted by p060064h mine is igetting a 2.5 transplant at the mo and they say its going to have 530bhp and over 550ftlbs or even more now they have decided to do a twisted turbo. they reasure me its going to be totaly realiable. and the original gearbox can take over 650bhp. so yes it will take that power Would be suprised if the original gearbox will take that sort of torque
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12 August 2008, 18:41 wrx287 Scooby Regular Join Date: Aug 2007 Location: In search of more power!! Posts: 1,166	Quote: Originally Posted by merlin24 Would be suprised if the original gearbox will take that sort of torque Me too. Im going for either a PPG kit or if i save up for a bit longer maybe a Quaife sequential wrx287 is thinking of going for a full WRC style interior
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12 August 2008, 19:18 banny sti Scooby Senior Join Date: Oct 2004 Location: Pennine Subaru 01422845007 and Lateral Performance Posts: 5,427 View My Scooby	If it is a 6 speed gearbox then it should handle that power, as that is what the Zen car runs. Banny
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12 August 2008, 20:38 Lateral Performance Scooby Regular Join Date: Oct 2006 Posts: 586