S3TH

iTrader: (2)

Before i go around getting quotes from tuners would like to get a rough idea of what i will actually be asking for.

My STi 4 has done 60k, possibly has a head gasket problem at the moment, is due for cambelt and previous owner did not always run it on optimax/booster even though he had his boost controller whacked up to 21 psi

I am currently sourcing parts in order to make 380 Bhp (Headers, decat, hyperflow IC, TD05/06 20G, apexi ECU, 550cc injectors) but i am thinking that an engine rebuild first would be a sensible idea. Seeing as i am going for a rebuild think that i might want to build a bullet proof 400bhp car.

If i asked someone to rebuild the factory to OE spec with the exception of a few uprated parts what parts do you think i should uprate? Dont want to go overboard here, just want a reliable 400bhp engine.

S3TH

iTrader: (2)

after reading the mammoth 20g turbo thread, scrub 400bhp, a bullet proof 380 is what i will be aiming for.

Mark A

iTrader: (1)

I'm no expert but I would have thought for reliability you would be looking to change the pistons and rods if you are going to run above 1.4 bar or are wanting >360 bhp. Having said that a number of "standard" internal STi's are runinng around the 400bhp mark at the moment.

I'd speak to a couple of the regular tuners (David @ API, Conrad @ TRL & Mark @ Lateral to name but a few), and just ask for some advice recommendations.

timmyajmy93wrx

iTrader: (27)

yeh, give dave @ api a shout - top bloke sort you out with no bullpoo!

S3TH

iTrader: (2)

yes dave sorted me out a rear diff for a good price a month or so back. Was going to be my first point of call to be honest.

APIDavid

iTrader: (4)

Call me on Monday, l'm not in the office Saturday - sneaked another day off - that's two so far this year - gettin' to be a habit.

I can get you sorted.

David Api Engines / APi Impreza 01926 614333

Fuzz

Probably a lot cheaper and quicker to sling in a new age short motor and use everything you have from the Sti 4, by the time you faffed about buying bits to rebuild your current one the price over takes that of the new short motor.


Andy

S3TH

iTrader: (2)

when you say short motor, do you just mean the block and then i fit my STi heads etc?

Fuzz

Yep, block, pistons, crank and rods, straight out of an sti 7/8

bolt your heads, and all other ancillaries to it and in it goes.

Andy

S3TH

iTrader: (2)

ah i c, for some reason i was thinking of the us 2.5 block.

APIDavid

iTrader: (4)

The 7/8 short motor suits a vers 5 or 6 better than 4 and backwards due to piston compression height and squish area problems. lt can be mapped out but isn't ideal as a bolt in conversion.

l know it happens / can be done, but I also see failed ones with detted piston crowns and another rebuild needed way too soon.

David APi Engines / APi Impreza

Fuzz

Ok, not heard that...

Andy

Live and learn

S3TH

iTrader: (2)

would a complete STi 7/8 engine go into and STi 4 though?

Fuzz

size wise yes but the cost of a complete motor. your back to being better off doing the rebuild on that idea.


Andy

S3TH

iTrader: (2)

Ive seen an STi 8 engine complete for 2k, done 5000 miles.

Fuzz

not to mention hassle with VVT


Andy

S3TH

iTrader: (2)

Just worried about rebuild costs, seen people selling imprezas that have had rebuilds and saying the rebuild was 4k!!

Anyway thanks for all your replies on this one guy, i should stop stressing so much lol.

Fuzz

Cheapest option in my opinion would have been the ready built and run in short motor but if there are issues with squish volumes then fair enough, you just have to add in the additional cost of mapping it on top of the replacement if you go that route.

Andy

Houghton

iTrader: (1)

API did a 2.5 conversion on my STi3 in October. It's done over 10K miles now and runs sweet as a nut. Has most of the bits you've listed too.

API for the engine swap and Andy Forrest for the mapping and excellent advice from both.

APIDavid

iTrader: (4)

Thanks Gerry,

David APi engines / APi Impreza