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View Full Version : Boost and EGT (Exhaus. temp.) on Z16LER.



GOLANt
2nd September 2011, 12:50 PM
Hi guys,

Does anybody know how much bost the stock engine Z16LER has?
And second questions, did anybody measure EGT for this engine?

Tom_Y2K4
2nd September 2011, 01:03 PM
http://www.vxronline.co.uk/forum/showthread.php?124892-CORSA-VXR-Boost&highlight=boost+pressure

;)

As for EGT not that i know of.

GOLANt
2nd September 2011, 01:09 PM
http://www.vxronline.co.uk/forum/showthread.php?124892-CORSA-VXR-Boost&highlight=boost+pressure

;)
lol sorry ;)



As for EGT not that i know of.
:(

Tom_Y2K4
2nd September 2011, 01:10 PM
lol sorry ;)

:(

It's a common question :lol: So its also easily answered when posed :D Hope it helps ;)

Why are you asking about EGT?

I think these guys might be able to help if you're looking to measure it....

http://www.vxronline.co.uk/forum/showthread.php?120742-Digital-LCD-Based-Gauges&highlight=zada

CH07 ALL
2nd September 2011, 01:11 PM
I have egt mate

Tom_Y2K4
2nd September 2011, 01:13 PM
I have egt temp mate

There's always one :lol:

GOLANt
2nd September 2011, 01:45 PM
Why are you asking about EGT?
Because i want use pistons from Z16LE* with different turbo engine A16DMS (Daewoo Lanos).


I have egt mate
How much on different range rpm and boost?

Rabbid
2nd September 2011, 01:47 PM
I wouldn't the stock corsa vxr pistons are worse then chocolate lol

I would get yourself some cosworth or other brand forged pistons. The cast ones in the corsa are weak.

Rabbid
2nd September 2011, 01:48 PM
http://theimghost.com/images/860_1_Medium_.jpg

Uprated on the left, broken standard on the right :)

Tom_Y2K4
2nd September 2011, 01:49 PM
I wouldn't the stock corsa vxr pistons are worse then chocolate lol

I would get yourself some cosworth or other brand forged pistons. The cast ones in the corsa are weak.

Happen to agree.

Cosworth - http://www.courtenaysport.co.uk/engine-rebuild-components-z16lex/info_169.html
Regal - http://www.regal-shop.co.uk/vauxhall/acatalog/Corsa_VXR_Engine_Internals.html

GOLANt
2nd September 2011, 01:50 PM
I wouldn't the stock corsa vxr pistons are worse then chocolate lol

I would get yourself some cosworth or other brand forged pistons. The cast ones in the corsa are weak.
I don't want use forged pistons, they are have some problem with cold start and i will use not much boost, about 1.0-1.5 bar.

Rabbid
2nd September 2011, 01:51 PM
No they don't if you get 79.5mm oversized ones and have your blocked bored to match they'll sit nice and tight.

Seriously though corsas are breaking pistons even as standard.

GOLANt
2nd September 2011, 01:52 PM
http://theimghost.com/images/860_1_Medium_.jpg

Uprated on the left, broken standard on the right :)

Are you have top photo this pistons?
What problem was right piston?
What upgrade piston?

Tom_Y2K4
2nd September 2011, 01:53 PM
Are you have top photo this pistons?
What problem was right piston?
What upgrade piston?

The standard cast piston (Piston #4) suffers from thermoshock when abused from cold.

Rabbid
2nd September 2011, 01:54 PM
The left one is Regal's uprated one, the right one is the damage usually observed to corsa pistons they usually crack round the rings.

Standard corsa VXR is 8.8 compression ratio but you can get both 8.5 and 9.2 uprated ones depending on your spec.

Point is if you're going to change your pistons you might as well do it properly with decent parts while the engines open. I'd even be doing uprated rods at the same time.

GOLANt
2nd September 2011, 02:06 PM
My comp. ratio will be about 8.2-8.5:1.
Am I right stok pistons will work well in my engine with boost 1.0-1.5 bar and 10.3-10.7 AFR or wrong?

Rabbid
2nd September 2011, 02:10 PM
AFR of 10.3 seems too rich?? Normally you'd be looking around 12.5:1

Well if you want 8.5:1 you'll need the cosworth pistons. I'd get the courts kit 79.5mm oversized including rods for 970 and get the block rebored to take the extra size. They'll not slap when cold to much if you do this. If you kept the standard 79mm then you might find some piston slap on cold starts with standard bore.

What turbo are you running and whats your HP goals?

Of course I'm assuming the bore and stroke of your engine is still the same as the Z16LER which is bore 79mm stroke 81.5mm

Rabbid
2nd September 2011, 02:14 PM
See here:

http://www.courtenaysport.co.uk/engine-rebuild-components-z16lex/info_169.html

Here is the deal for Pistons Rods and Bolts:

http://www.courtenaysport.co.uk/buy-online/shop-by-category/tuning-components/cosworth-pistons-and-steel-rods-z16lex-z20lex-turbo/prod_598.html

GOLANt
2nd September 2011, 02:20 PM
AFR of 10.3 seems too rich?? Normally you'd be looking around 12.5:1

Therefore I also ask about stock EGT to control AFR. How AFR in stock engine with boost?



Well if you want 8.5:1 you'll need the cosworth pistons. I'd get the courts kit 79.5mm oversized including rods for 970 and get the block rebored to take the extra size. They'll not slap when cold to much if you do this. If you kept the standard 79mm then you might find some piston slap on cold starts with standard bore.

What turbo are you running and whats your HP goals?

Of course I'm assuming the bore and stroke of your engine is still the same as the Z16LER which is bore 79mm stroke 81.5mm
Rabbid, i don't want use forged pistons, price for me too much. I will use stock Z16LE* piston because i want know stock EGT, BOOST and AFR.

CH07 ALL
2nd September 2011, 02:27 PM
i havent studied it to the degree of rpm to boost through the range. i tracked the car the other month and at full boost i was getting around 750 deg @20 psi. on a normal drive with bosot around 5-10psi im getting around 3-400.

but as rabbit says forged pistons are the way to go, if standard cars with standard boost are failing than tuning is going to highly increases the risk

Rabbid
2nd September 2011, 02:29 PM
Well its your engine to do as you wish but I would strongly recommend not using a cast piston in a tuned turbo engine.

Whats the standard compression ratio stroke and bore of your engine currently as you'll need to know what the corsa piston will do to your compression ratio?

The stock piston will give you 8.8:1 compression on a corsa VXR so I make the size of the combustion chamber size is about 51.24cc. If you want to run standard VXR pistons you may need to use a thicker gasket or have head work done to drop your compression ratio unless your engine is different.

GOLANt
2nd September 2011, 02:39 PM
i havent studied it to the degree of rpm to boost through the range. i tracked the car the other month and at full boost i was getting around 750 deg @20 psi. on a normal drive with bosot around 5-10psi im getting around 3-400.
Thanx very much!



but as rabbit says forged pistons are the way to go, if standard cars with standard boost are failing than tuning is going to highly increases the risk
My engine N/A in stock so this pistons is tuning for it.

Rabbid
2nd September 2011, 02:41 PM
Yeah but if your combustion chamber size, stoke and bore are not the same as the corsa vxr then you'll get different compression ratios. From looking up what I can find out about the A16DMS the stoke and bore do seem to be the same as the VXR however I cannot find the stoke combustion chamber size to tell you what compression ratio you'll get on corsa VXR pistons. Nor can I find your stock compression ratio..

GOLANt
2nd September 2011, 02:48 PM
Well its your engine to do as you wish but I would strongly recommend not using a cast piston in a tuned turbo engine.

Whats the standard compression ratio stroke and bore of your engine currently as you'll need to know what the corsa piston will do to your compression ratio?

Stock comp. ratio 9.5



The stock piston will give you 8.8:1 compression on a corsa VXR so I make the size of the combustion chamber size is about 51.24cc. If you want to run standard VXR pistons you may need to use a thicker gasket or have head work done to drop your compression ratio unless your engine is different.
My comb. chamber is 42cc. Yes, i will use thicker gasket about 2mm. How thick stok gasket in Z16LE* ?

Rabbid
2nd September 2011, 02:51 PM
Not sure on the thickness on the stock gasket, but you should be ok with a 2mm increase.

Rabbid
2nd September 2011, 02:53 PM
Just a random thought, what about using a Corsa VXR engine itself you can find second hand units for not that much.

GOLANt
2nd September 2011, 02:56 PM
Not sure on the thickness on the stock gasket, but you should be ok with a 2mm increase.
Are you know thick stock gasket on the Z16LE*?

Rabbid
2nd September 2011, 02:59 PM
Not sure on the standard gasket side but you usually can get thicker ones designed for when people have had to have the head skimmed. So I'm sure there will be something out there.

GOLANt
2nd September 2011, 03:02 PM
Not sure on the standard gasket side but you usually can get thicker ones designed for when people have had to have the head skimmed. So I'm sure there will be something out there.
Your gasker from 2 layer stil? If yes then it have thick about 0,4-0,5 mm.

Rabbid
2nd September 2011, 03:50 PM
I believe stock is 3 layer but don't quote me on that lol

GOLANt
2nd September 2011, 03:54 PM
I believe stock is 3 layer but don't quote me on that lol
ok :)

Tom_Y2K4
2nd September 2011, 04:06 PM
http://www.vxronline.co.uk/forum/showthread.php?141999-uprated-headgasket&highlight=gasket

;)

GOLANt
5th September 2011, 08:05 AM
http://www.vxronline.co.uk/forum/showthread.php?141999-uprated-headgasket&highlight=gasket

;)
You are the best ;) Thx!