BJX Engine Limits?

[KennyPOLO_Gti]

Does anyone know what the limits are on the standard internals on these engines? Lots of info one the BAM,AMK,AUQ been rated to 340bhp but nothing on the 150 (BJX). APR claim there Stage 3+ kit is fine on standard internals but no sure if they are talking about the 225 engines.

Kenny

 

[Joens]

I would say 300~ , but this is not a fact just a guess.

 

[B3NNO]

Yeah ive also got the BJX Engine in mine too, I can never find parts relating BJX is there another engine code that is associated to it?

 

[Ferryman]

BJX engine shares the internals with other 150-190bhp 1.8T engines.

The crankshaft and pistons won´t be a problem.
The connecting rods are.

It isn´t the power killing these rods, torque is.

With smooth torque curve they can take around 250lb/ft (350Nm) without any problems, but there has been cases where the rods have been bent or even completely blown (<- equals a new engine) with just over 220lb/ft (300Nm) of torque. This usually happens with small turbos which are spooling up very fast and reaching their limits (i.e K03 & K04).

If you want more power and torque safely, get the rods changed.
It is cheaper to get the rods done than getting a new engine (well atleast usually)

If you still plan to push it without changing the rods, take a look at these pictures.
These were the STRONGER (20mm) rods used in 1.8T BAM (225bhp) engine.
This happened with around 300lb/ft of torque, which is usually considered safe for the stronger 20mm rods.

Pictures by paul-murphys.

 

[ljpacey]

nice lol! the 1.8 t has semi forge pistons but yes the rod are weak and the exhaust cam is weak not to worry tho think you can get some forge rods for around £500 bit less may be, would be good idear the get a arp bolts then your safe ish, wen you start goin into bigs ish power you will get a grater risk off something major brakeing wach for the oil pick up line it dose get bloked i no a few who have had this problam but sorted it be for major failure. look on youtube theres a guy who builds the 1.8 turbo engine with all forge internals may help you.

 

[KennyPOLO_Gti]

Thanks guys

Saw that conrod that went in the guys build thread. Are conrods not more prone in going on K03 hybrids due to so much low down torque and the way it is delivered? Where as a GT2860RS is more top end.

So what do people think, just conrods to get done for internals.

P.S. Its the APR stage3+ kit i am getting. I know some people have ran this on standard but thats in Golf 1.8T (AUQ,AUM)

Kenny

 

[Yosh]

Running 224hp & 371nm (at the wheels and at 1300m altitude) on BBU 1.8T motor with all the bolt-ons & stock K03S...K04-022 going in and also considering doing IE rods...

 

[Ant FR]

i'd have a chat with someone who knows the 1.8 like the back of their hands, so maybe have a chat with Bager 5, Jabba or JBS who have all been doing big turbo conversions forlonger than most us have had hot dinners, They'll know what you need to change. But i would'nt skimp, if you want the big BHp you need to spend the money on protecting th engine too, no point being the fastest for 10 minutes.

 

[ibizatom]

Ok, so nearly a year on, does anybody know any more about the BJX engine?

 

[truss]

well, there appears to be lots of FR's/cupras running in excess of 265lb/ft of torque. it appears that some run up to 300lb/ft but are advised there running a risk with the rods.

 

[ibizatom]

Well I am over the 300lbs torque with my Stage 2 petrol FR. Was hoping there might be more info about BHP limits.

 

[truss]

i think its the torque you have to watch, power is the product of torque.

 

[truss]

Well I am over the 300lbs torque with my Stage 2 petrol FR. Was hoping there might be more info about BHP limits.

is that on standard turbo?!

 

[Chino_UK]

I'm a bit nervous when I read these threads about the torque too lol

 

[ibizatom]

is that on standard turbo?!

Standard K03s yeah.

 

[Yosh]

Well they seem to not like anything above 430nm at the wheels LOL!!! They tend to snap and make new holes in the block and sump...Silly k04-022 to be pulled off for GT30 on my new 2.0L stroker build...

 

[ibizatom]

I don't supose you know about how much more HP can be made out of the standard engine internals before changing the rods?.

I know the turbo is basically maxed out while still being safe but surely there has to be a few other mods to raise the HP?

I was gonna give the 3 inch tip a go but wait on dimensions for some silicone parts.

 

[truss]

Well they seem to not like anything above 430nm at the wheels LOL!!! They tend to snap and make new holes in the block and sump...Silly k04-022 to be pulled off for GT30 on my new 2.0L stroker build...

cannot wait to see this!