View Full Version : Interesting about the Z20LEH
The 240PS Z20LEH as fitted to the forth coming Astra and Zafira VXR does not have balancer shafts installed like the Z20LET, this to reduce inertia on the crank, therefore does not have the ring gear on the crank itself, making it a little lighter.
The crank (apart from the ring gear) and rods are identical to the Z20LET. Still waiting to find out if the VXR head which is heavily modified from the Z20LET to increae cooling will fit the Z20LET block. Not sure if the water galleries are different.
The X20XEV didnt have balancer shafts until it was fitted to the MK4 Astra, They fitted them so they could decrease the size of the flywheel and still maintain a smooth idle etc.
I wonder how they have got around it now then.
The block is different too, as it comes with oil spray bars for increased cooling, I am sure there are 101 other differences too, but thats as much as i know:redface:
i thought it was a full alloy block as the 2.2. i understand its the same engine as used in america and on the saab's??
Here is a list of the exact differences between the Z20LET and Z20LEH
The pistons are High Yeild Forged pistons instead of the sand cast pistons like the ZLET.
The Block is pretty much the same apart from the oil spray bars for under piston cooling.
The head in extensivley modified for extra cooling.
Different spec turbo charger, some may call it a Hybrid.
Different Mapping
Full frontal intercooler
But it is a development of the Z20LET, I may be getting hold of one of these engines after Christmas for my Zaf if all goes to plan.
The question is though Mat, how much software changing will they take ?
Already heard that EDS can map the 170ps to 230....although not proved successfully yet :wink:)
i thought it was a full alloy block as the 2.2. i understand its the same engine as used in america and on the saab's??
That was the 170bhp(iirc) 2.0 turbo as used in the Vectra C.
Cheers for the info Matt!! :) Where you been hiding??!!?? Long time no hear?
That was the 170bhp(iirc) 2.0 turbo as used in the Vectra C.
Exactley right Ross, the 170-175bhp Vectra Turbo engine is the same all alloy unit as the 2.2 and 2.2 Direct Petrol.
Cheers for the info Matt!! :) Where you been hiding??!!?? Long time no hear?
Everywhere!!!! Working in the states for a time in April and May then on holiday for 2 weeks.
But back now and eager to catch up!!!!!:smile:
The question is though Mat, how much software changing will they take ?
Already heard that EDS can map the 170ps to 230....although not proved successfully yet :wink:)
To put it in simple terms, if you look at what I had fitted on my car with the 200bhp Z20LET :-
Front Mounted Intercooler (Bottom)
CS3 Map
Milltek Exhaust System
Sports Cat
Pre-Cat replacement pipe
K&N Filter
Air Box mods
This acheived between 255-260bhp.
Do the same mods to the new Z20LEH and you should be in the region of 280-290bhp but with much more reliability and durability due to the internal changes to the standard LEH engine.
But after talking to Jon at Courtenay, 300bhp will still be difficult because the new engine still uses the same exhaust manifold as the Z20LET. So once someone designs and offers a new manifold, 300BHP from the new engine will be very easy with the same mods that I did to mine.
In fact, once a new manifold is available, the mods I had as listed above with the addition of a Hybrid on the Z20LET will acheive 300bhp.
The Z20LEH will offer a good solid base (Way better than the ZLET) for some serious tuning in the future, I would even go as far as saying more so then the C20LET.
The question is though Mat, how much software changing will they take ?
Already heard that EDS can map the 170ps to 230....although not proved successfully yet :wink:)The 170ps Z20LEL is purely a 200PS Z20LET with a map to reduce the power, torque is the same as the Z20LET at 184 lb/ft. Everything else is identical, so the 170-230PS re-map is not as impressive as it sounds as in reality you are starting with a 200PS engine.
The 200PS Z20LER although has 200PS like the ZLET, has increased torque to 196lb/ft. I will be interested more to see how the re-maps on this engine performs when it comes out.
One thing is for sure, I have been told the Z20LEH VXR map will notbe suitable for the Z20LET,LEL,LER. Mainly because the VXR engine internally is a different beast and also has a different turbocharger.
The ZLET, ZLEL, ZLER all have the exact same turbo.
Shame they didnt design the Z20let properly in the first place, could have saved them selves some hassle and ££££££
The ZLET is designed properly and suited a purpose. It is an interesting point though, many people slate the ZLET for not being built the same way as the C20LET.
Regulations and of course cost had a big input, the CLET was only to be used in two models, where the ZLET was put into 6 models, and the later version into the two Astra mk 5's.
But know one ever slates the Z20NET from the Vectra, not built like the C20LET but it never gets slated.
Im not slating any of the engines.... just seems silly that they could have forseen the need for more power in the years ahead... why didnt they just use the right pistons and oil spray bars to start with... seems silly!
Im interested to see what boost the vxr runs, i dont recon the increase in boost will be much at all... Probably just cam and ignition changes to get the extra grunt!.... and also if they use a decent airflow meter that lasts longer than the warrenty period!
I would think they would use the same air flow meter to be honest.
I think the reason they did just the 200PS version initially, because when the engine was developed back in 1998/1999, I doubt Vauxhall/Opel even new that within 5 years a requirement for a 240PS version would be there.
But at least now they are 'over engineering' it for the VXR. Just think, the 170PS Astra H is working way below it's capabilities.