I've been looking a bit today for something to go alongside our 2012 STI and it is going to get some serious track abuse. I'm after a Blob as the Mrs doesn't like the bugs, but I'd be very interested to know if there's any significant advantages to buying a JDM Blobeye WRX over a UK car?

Also does the Bug STI have any decent selling points that might be worth a shot to change the Mrs' mind?

I'd quite like a Blob STI, pre widetrack of course, and would push to £6k for one. I do think I'd take a well specced enthusiast owned and built WRX up to about £5k over a standard £6k STI though. i.e. if it had decent brand coilovers, mapped by someone reputable and was ready to go straight on track, spec wise.

Which newages have and haven't got forged pistons?

Cheers folks. I appreciate some of this stuff will have been answered before but I'm about to leave work so wrote this in the hope I'd have some decent answers by the time I get home

 

If it's for track a bug STI is far better than a blob WRX

better

engine
brakes
suspension
gearbox
turbo


etc

 

No newages have fuly forged pistons either.

 

Echo the above for track use

Decent brakes
Stronger gearbox
Stronger engine
Same power as a modded wrx but a lot stronger

 

Apart from the JDM bug STi

 

I said fully forged.

 

Which are the same pistons as the UK bug STi

 

The bug STI front seats are also more supportive than the blobs by all accounts.

 

Hypereutectic (sp) iirc

 

Theres a few cheap classic RA's kicking about at the moment for that price, good base for a track car and significant weight advantage to a newage. Doesnt take much power in an RA for it to be entertaining.

 

V7 (bug) JDM and UK pistons were forged.
V8 (non widetrack blob) pistons were forged on UK cars and hypereutectic on JDM cars.
All V9 (widetrack blob) and V10 (hawk) pistons are hypereutectic.

 

hi mate...are you sure thats correct?? the uk non widetracks blobs have forged pistons??

 

The UK blob STI has hypereutectic pistons.

 

cheers pal...i didnt think they were forged

 

So Bug is the better engine then by the sounds of it? Out of the box at least. Interesting, thank you guys.

When did JDM STIs get twin scroll turbos?

 

sorry to go off topic but do these hypereutectic pistons make piston slap like forged ones aswell??

 

2003 onward (blob)

 

I standard corrected, Plenty is correct.

Looking at Subarus own part numbers the part number for the UK Bug STI piston is the same as the Uk blob STI....So it would appear they are forged and not hypereutectic.

 

Yes - there was a long debate about this on nasioc.com - with the conclusion summarised by John Felstead here.

Also substantiated by Zen Performance here.

TBH it's moot anyway, as even the hypereutectic pistons are proven to be reliable up to 450 bhp.

 

Would consider selling my classic 99 RA 555 for 5k , very clean original spec apart from exhaust and coilovers and great base for a track car

 

nice one pal

 

From what I know as we had this discussion with Luke and all non twinscroll ej207 have true forged Pistons including the jdm.
The twinscroll got the hypereuctic pistons.

 

Subarus own part numbers suggest otherwise.

 

For which one? Widetrack?

 

Uk bug STI, JDM Bug STI and UK Blob Sti upto 05 all share the same piston part number.

The JDM MY03/MY04/MY05 have a different piston part number than above.

 

That's basically what I said, all non twinscroll ej207s (newage of course) have forged Pistons the jdm 03/04/05 are twinscroll
part numbers for bug, blob
Grade A 12006AB430
Grade B 12006AB440
2001 to 2005

And I'd think the widetrack comes into this too?

 

AB430 for the forged and AC430 for the hypereutectic.

 

I stand corrected too.

 

I quoted part number for bug and blob just for reference