Jam Performance

iTrader: (3)

Check this out, Sti5 Type R on standard internals running a GT30 mapped by Steve from FC Tuning..

Subaru Impreza Type R

stu1984

nice ,,,,

I should be ok , im looking to run about 350bhp on std internals when i get my car back on the road.

Jam Performance

iTrader: (3)

Easily Just shows what the standard EJ20 engine is capable of

dazdavies

iTrader: (22)

Until the crappy Classic OEM rods give out. The Forged pistons are fine at that level but the rods are sh*te and have been known to frequently fail at significantly lower power levels!!!!!

I wouldn't want to run over 300bhp on Classic OEM rods.

duncatr

iTrader: (18)

Well my STI engine ran fine at 340BHP for long enough and its now handling just shy of 400BHP on a 20G with no problems so far.

T5OLF

iTrader: (4)

Mine has been running well over 300 brake on standard internals for 4 years now with no problems.

Pavlo

Nice result!

I wouldn't rely on the rods at that!

dazdavies

iTrader: (22)

Rather you than me, It's not a strategy I'd be taking considering the dozens of rod failures on Classics.

When a rod let's go it's messy, very messy. Inevitably that means its expensive too.

joey_turbo

iTrader: (26)

There is a 400+ in the latest Banzai or the one with dazdavies car in, thats a UK turbo on standard internals. So thats not even CDB.

marc1941

iTrader: (1)

Currently running 457bhp and 399lbft on uk turbo with standard rods with no problems at all

eggy790

iTrader: (20)

lol at above , mad guy

Pete

Good on ya pal, admire your madness.........

KareenaBaby

u have a nice lookin car babes x x

Mus

iTrader: (2)

rods do not fail due to POWER

they fail due to TORQUE

its the force of torque and reciprocating mass that will force A bolt to stretch

its when the bolt stretches and fails to clamp down on the cracnkshaft

dazdavies

iTrader: (22)

The open deck block isn't the weak part of the equation nor are the pistons.

Its the CLASSIC oem Rods.

If you're running a true 457 bhp on an original engine from a classic shaped UK car then you're on borrowed time and you won't be far away from a massive engine failure.
Because in an engine from a UK classic both the rods and pistons are crap.


If it was a newage then fair enough as the rod design is totally different.

All these people quoting reasonable power from UK Classic are they on untouched original UK Classic Bottom ends???

Pete

Daz,

Excuse my ignorance, SO an Import classic is stronger internally then, that,s what you,re saying?? so what,s the max i could run my V3 internals too??

T5OLF

iTrader: (4)

I ran ARP rod bolts in my astra 16v engine. Shame these engines are not as easy to work on or I would do the same.

Are the import rods able to stand more than the Uk ones - anyone?

jd5217

Daz suggest you pick up the Winter 2008 copy of Total Impreza.

Pavlo

Rods from the newage car seem much more durable than those on the classic shape engines.

jd5217

fingers crossed the newage are better, no issues on mine to date.

Mus

iTrader: (2)

what turbo are using and how long has been like that?

fc tuning sent me a link the other day of him tuning a bike he seems to tune anything with engine and ecu.lol

thats some impresive figures up there then gain he had two mag featured cars within the last 2months.

Neil..

iTrader: (35)

Marc, yours is a UK turbo, with an STi8 bottom end in, so far superior to std classic set up.

Jam Performance

iTrader: (3)

Makes sense now, I was thinking how those power/torque levels were possible on standard uk turbo bottom end

dazdavies

iTrader: (22)

Right lets try and starighten some of this out I don't need to read magaine articles.

I'm saying that original bottom ends from a classic UK scooby are weak. This weakness is caused by crappy OEM rods and crappy cast pistons!!

We are talking about original untouched bottom ends, not ones that have been replaced with short motors from later models i.e Newage STI 8 bottom ends which have a completely different rod design and slightly better pistons.

Pete

Even import Classic STI's use the same crappy rods so the same problem exists. import WRX bottom ends are usually the same as the crappy UK bottom ends. SOME classic STI's came with forged pistons which makes them stronger than the uk engine but the rods are the same.

In short Pete yours is an STI so it will still have the weak rods but should have forged pistons. Your rods are still the limiting factor. I wouldn't want more than an absolute maximium of 350bhp going through standard rods and I wouldn't have 100% faith in that holding together.


I thought 457bhp and 399ftlb was too good to be true for a standard classic bottom end.

Remember folks we are talking about a standard UK engine or a WRX engine from a classic. Not STI's and certainly not bottom end transplants from Newage STI's.

stevie1982

iTrader: (16)

if the bottom end in a classic can take 400bhp with similar torque, is it not worth just uprating the rods? Say to new age or arp rods or similar Can this be done with the lump left in or is it still an engine out and strip down?

MartynJ

Not unless you know a good gynaecologist, lmao.

dazdavies

iTrader: (22)

I'm dizzy I keep going round in circles.

A bottom end from a classic is not good for 400bhp. The only parts of it that are capable are the crank and the block and the STI forged pistons if you have them.

Repeat after me

In short for a reliable 400bhp from a classic bottom end you would ideally replace the rods, pistons and bearings.

I'm not going to say it again lol

ps ARP don't make rods

john banks

That's the reason I can't do it, I only have a diploma from the Royal College of Obstetricians and Gynaecologists, if I was good I'd have a membership, then I could buy a Subaru and change the rods and pistons with the engine in place like you can on an Evo, but without the crappy Evo gearbox

BTW, I had 406 BHP on a stock internals MY00 UK turbo years ago but I didn't trust it to stay in one piece so had a series of rattly forged 2.3s and then moved to 2.5s.

dazdavies

iTrader: (22)

2.5's FTW especially the sleeved closed deck variety with forged internals!!

stevebt

iTrader: (8)

Daz, so if I want a reliable 400bhp on a UK block I pnly need new bearings and thats it????