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2.5 Conversion In Classic


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hi just killed the crank the other day in my type r and now looking to put in a 2.5? who has done this and how did they do it? did you use complete standard 2.5 bottom end or did you uprate pistons and rods? any help much apreciated!

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If you're going to the hassle of fitting the 2.5 engine then I would definitely stretch that little bit further and fit uprated pistons and rods at the same time... makes more sense IMO. You will need to get the car custom mapped for the conversion though, even when running it in. I know a guy up north who didn't do this and ruined a perfectly good RCM 2.5 by running it on stock ECU while he was breaking the engine in.

I drove a 2.5 Classic with a 20g and an STi V5 Gearbox/Diffs.... it was mentally quick, so I'm guessing it'll be even faster in a TypeR. :thumbup:

Cheers,

Grant

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I've got a 2.5 in mine, it's great. It was a simple operation just a 2.5 sti short block so standard sti pistons, crank etc, kept my V3 heads and cams as the v3 has the best heads and cams of any scoobs. The only other upgrades that were really neccessary were uprated fuel pump, bigger injectors (650cc) and an Apexi power fc. And of course a trip to Mr Forrest. I did a few other upgrades too but not essential ones, decat downpipe full quota of samco hoses etc. Obviously you'll need a new oil pump and oil cooler too, they are definately essential.

I've got 343bhp and 360lb ft, car goes like turd off a well polished shovel :thumbup:

Edited by stevenhiggster
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cheers grant yeh i'm trying to way up all the options as different tuners keep saying different thing? for the price of a rebuid on my own engine i could a 2.5 or 2.1 strokers seems obviously the best option? i feeling the extra torque of the 2.5 would make best road car? all the been reading posts about them using alot of oil?

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cheers grant yeh i'm trying to way up all the options as different tuners keep saying different thing? for the price of a rebuid on my own engine i could a 2.5 or 2.1 strokers seems obviously the best option? i feeling the extra torque of the 2.5 would make best road car? all the been reading posts about them using alot of oil?

Mine honestly uses no oil at all, as long as you bed it all in properly it shouldn't. I did about 300 miles on the cheapest ****tiest mineral oil you can get, it lets everything bed in properly. Then changed to proper good stuff till about 1k miles then another oil change before my remap. All done without ever going above 3k rpm.

The trip home from Andy's was awesome fun :thumbup:

Greersport did all the work on mine just about a year ago and I haven't had any problems at all.

Edited by stevenhiggster
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Mine honestly uses no oil at all, as long as you bed it all in properly it shouldn't. I did about 300 miles on the cheapest ****tiest mineral oil you can get, it lets everything bed in properly. Then changed to proper good stuff till about 1k miles then another oil change before my remap. All done without ever going above 3k rpm.

The trip home from Andy's was awesome fun :thumbup:

Greersport did all the work on mine just about a year ago and I haven't had any problems at all.

cheers steve sorry your reply must have came up when i was replying to grants! what box are you running in yours? did you get it mapped for running in as grant says have heard of a couple of engines going bang due to still running the 2ltr map! i have uprated pump,full 3" system and decat! also have font mount waiting go on too!

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cheers steve sorry your reply must have came up when i was replying to grants! what box are you running in yours? did you get it mapped for running in as grant says have heard of a couple of engines going bang due to still running the 2ltr map! i have uprated pump,full 3" system and decat! also have font mount waiting go on too!

I didn't actually,I turned the boost pretty much off though and absolutely never went above 3k rpm or revved it even remotely hard. I pretty much wrapped it in cotton wool until it was mapped. The only people you hear about ruining engines while breakin em in probably haven't been taking enough care while doing it.

Bill [Greer] was telling me about a guy who had it done and broke the engine while bedding it in. The guy went back into them and said he wanted it fixed and that they hadn't done it properly. Luckily someone they knew had mobile phone footage of that same guy doing doughnuts in a carpark the night before, while still breaking in his engine! Thats the sort of people who ruin engines :thumbup:

Oh and I'm just running the standard V3 STi 5spd box and diff etc, Exedy organic clutch though to deal with the extra torque, and boy is there some extra torque B)

Edited by stevenhiggster
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I would say your playing a dodgy game running in a new engine thats not standard without a suitable map.....my new CDB 2.1 stoker engine is going into my car next week and with the advice of engine tuner who built the engine and the guy who is going to map my car they all say a run in map is essential.....its a large price to pay if a run in map only costs about £150.........just how its been put to me and from what ive read on the net!!!

Jase

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When i did the 2.5 conversion i sent the heads away to be skimmed,valves re-shimmed and new stem seals also the combustion chamber needs honed out a little.

I fitted 550cc injectors,fuel lab regulator and td05 20g all from Andy F. After it was all fitted up i ran it in with mineral oil and a base map from Andy aswell.Then after the first 250 miles i dropped the oil and put Fully synthetic in till 1000 miles was covered then it was full map 360bhp 380lbs torque.

Quick road car :thumbup:

Gus

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I would say your playing a dodgy game running in a new engine thats not standard without a suitable map.....my new CDB 2.1 stoker engine is going into my car next week and with the advice of engine tuner who built the engine and the guy who is going to map my car they all say a run in map is essential.....its a large price to pay if a run in map only costs about £150.........just how its been put to me and from what ive read on the net!!!

Jase

Really? thats odd alan told me the total opposite last week saying it wasnt needed, are you still getting the same guy to do your mapping jason? how far in advance do you need to book him for a run in map?

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