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TDI Power Enhancements Discussions about increasing the power of your TDI engine. i.e. chips, injectors, powerboxes, clutches, etc. Handling, suspensions, wheels, type discussion should be put into the "Upgrades (non TDI Engine related)" forum. Non TDI vehicle related postings will be moved or removed. Please note the Performance Disclaimer.

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Old January 13th, 2017, 10:13   #61
Markus L
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My 1.9 VE made over 370 bhp with just slightly ported head so why CR wouldn't do big power? These are not naturally aspirated engines so if you want more air just add boost. 2260 is not even near to choke with 250 bhp.
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Old January 13th, 2017, 12:43   #62
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I literally give up.
Clearly some people are beyond reading.
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Old January 13th, 2017, 17:07   #63
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Quote:
Originally Posted by xjay1337 View Post
I literally give up.
Clearly some people are beyond reading.
Not me, i'm still reading, all this is very good info.

You have a very nice car btw... congrats.

I've reread again your build thread, so with your set-up you'r still running on Lambda calculation in the ECU?

The only thing I find strange, is the linear figure of what's supposed to be maxed out, the VE efficiency of that engine is not linear, when there is not enough air, you should have more and more smoke as the RPM increase.

I'll be curious to see VCDS log of the various fueling parameter of your car.
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Old January 14th, 2017, 01:20   #64
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Quote:
Originally Posted by Markus L View Post
My 1.9 VE made over 370 bhp with just slightly ported head so why CR wouldn't do big power? These are not naturally aspirated engines so if you want more air just add boost. 2260 is not even near to choke with 250 bhp.
16 valve heads easily outflow even slightly ported 8v heads. Problem with those is valve control when having increased flow on boost and emp. Luckily there is a fix for that. gtb2260vk is indeed good for 300+ hp so plenty of room there.
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Old January 14th, 2017, 02:00   #65
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There is also a 297hp tune in US i think, A3 big turbo audi here on forum with WMI
I imagine a dyno being 10-15 hp too optimistic but 45-50 difficult to believe.
From what i've been told its a matter of fuel atomization, quality of burn and timing and not an air flow question to make hp on the CR engine.
Numbers show it flows enough air, more than any BKD 16v engine, and much more than 8v heads.
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Old January 14th, 2017, 03:54   #66
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Originally Posted by diffas View Post
16 valve heads easily outflow even slightly ported 8v heads. Problem with those is valve control when having increased flow on boost and emp. Luckily there is a fix for that. gtb2260vk is indeed good for 300+ hp so plenty of room there.
Well, this kind of basic stuff like stiffer valve springs should be done before you judge the head is too restrictive. Of course if you ask vendors what to do they recommend head porting and lots of other stuff they want to sell you. I think it's just wasting money.

I'm sure 400 bhp could be done with stock ports.
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Old January 14th, 2017, 04:37   #67
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Van Vught Tuning in Holland , Johan is present on forum ..he can enlighten us if he wants
Following his tunes on FB and seems he does a freakin' good job
IIRC his 2.0 CR Golf has 270hp on stock pump

295+hp and 540Nm

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Last edited by Macradiators.com; January 14th, 2017 at 04:41.
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Old January 14th, 2017, 09:34   #68
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Johan has consistently gotten 270 to 280 hp on his cr tunes. He would also agree that 28xhp is the flow limit of the head. You can put a bigger turbo on to try and push more through but emp just goes much to high for gains to be reasonable. The emp will have direct impact on peak cylinder pressure and how long your engine will last before it destroys itself, for those who think just putting a bigger turbo is answer. As already pointed out, head work is necessary. Johan and myself have already test a regrind cam on OEM head and it did not help. There has to be head work done to support the cam grind. Head work includes valve changes.
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Old January 14th, 2017, 09:43   #69
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Like pointed earlier the problem is not in the head flow.
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Old January 14th, 2017, 11:06   #70
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Here is flow measurements I have collected about stock diesel cylinder heads:
http://npsheads.com/index.php/flow-database
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Old January 14th, 2017, 11:26   #71
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Yeah Marko, great having some number to back up the claims.

3 angle valve job done , camshafts and some head work




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Old January 14th, 2017, 13:52   #72
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Quote:
Originally Posted by TDIsyncro View Post
Johan has consistently gotten 270 to 280 hp on his cr tunes. He would also agree that 28xhp is the flow limit of the head. You can put a bigger turbo on to try and push more through but emp just goes much to high for gains to be reasonable. The emp will have direct impact on peak cylinder pressure and how long your engine will last before it destroys itself, for those who think just putting a bigger turbo is answer.
No need for bigger turbo, GTB2260VK is good for 300+ bhp.

Quote:
As already pointed out, head work is necessary. Johan and myself have already test a regrind cam on OEM head and it did not help. There has to be head work done to support the cam grind. Head work includes valve changes.
It's quite obvious that you don't get any gains with regrind cam if valves are already floating. I agree that a headwork needs to be done; stiffer valve springs are definitely needed.
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Old January 14th, 2017, 14:35   #73
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Is it possible for valve float to manifest on a 5000rpm diesel engine in our case?
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Old January 14th, 2017, 14:42   #74
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Quote:
Originally Posted by diffas View Post
Like pointed earlier the problem is not in the head flow.
What is it exactly then?

Quote:
Originally Posted by named tintin View Post
Not me, i'm still reading, all this is very good info.

You have a very nice car btw... congrats.

I've reread again your build thread, so with your set-up you'r still running on Lambda calculation in the ECU?

The only thing I find strange, is the linear figure of what's supposed to be maxed out, the VE efficiency of that engine is not linear, when there is not enough air, you should have more and more smoke as the RPM increase.

I'll be curious to see VCDS log of the various fueling parameter of your car.

Thank you.
Im not putting logs up I'm afraid. We have proven headflow is limited, oh well.
People will only blame the terrible tune

We will have special turbo and head built soon.

Terminal speed and 1/4 mile times speak words over claimed dyno figures anyway.
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Old January 14th, 2017, 14:46   #75
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Quote:
Originally Posted by Markus L View Post
No need for bigger turbo, GTB2260VK is good for 300+ bhp.

It's quite obvious that you don't get any gains with regrind cam if valves are already floating. I agree that a headwork needs to be done; stiffer valve springs are definitely needed.
I think you need to reread my post. Gtb2260 is good for more than 300+hp on lots of engines but not on OEM cr engine. You missed my point.
I have not done the calcs to see if there is float due to emp and imp at those low boost levels. Certainly on my engine it would be a problem without upgraded springs. I am doubtful it is a problem on 280 hp cr. "It's quit obvious..." lol.
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