BBT K418T Porting hot side - worth it?

badger5 · Nov 18, 2015

Another Example of today of what you will end up with if you for example buy a hybrid and pair it with a V4...

Unportmatched, there is a step. turbo inlet smaller than the mating manifold flange face.
But is fixable by port matching as below. No shocker as to which one you think will run nicer, flow better etc etc etc... thus helping enable the hybrid to perform..

All these hotsides, regardless of make/supplier/origin vary in the concentricity of the as cast bore to the 3 x machined fixings.. They are inconsistent. Some better centred than others. Another variable (unwanted) in the quest for getting the best out of a hybrid.

Help yourselves folks.. make the best of what you have. Optimise it.

daz-20vt · Nov 18, 2015

speaking of optimising it.
should I sell my pro4 and get a b5 manifold. cough cough
obviously going to port my hybrid

S3 Hilife · Nov 18, 2015

badger5 said:
Help yourselves folks.. make the best of what you have. Optimise it.

My Mrs keeps telling me the exact same thing

RB S3 · Nov 18, 2015

badger5 said:
Another Example of today of what you will end up with if you for example buy a hybrid and pair it with a V4...

Unportmatched, there is a step. turbo inlet smaller than the mating manifold flange face.
But is fixable by port matching as below. No shocker as to which one you think will run nicer, flow better etc etc etc... thus helping enable the hybrid to perform..

All these hotsides, regardless of make/supplier/origin vary in the concentricity of the as cast bore to the 3 x machined fixings.. They are inconsistent. Some better centred than others. Another variable (unwanted) in the quest for getting the best out of a hybrid.

Help yourselves folks.. make the best of what you have. Optimise it.

Is that my k418t? ;-)

badger5 · Nov 19, 2015

RB S3 said:
Is that my k418t? ;-)

yes

S3 Hilife · Nov 19, 2015

Anyone done before and after (porting) dyno runs? That would be interesting to see how much can be achieved just from port matching the turbo to manifold

Steve

daz-20vt · Nov 19, 2015

pro4 or b5 mani
come on so.eone must have the balls to answer.

S3 Hilife · Nov 19, 2015

daz-20vt said:
pro4 or b5 mani
come on so.eone must have the balls to answer.

I know which I'd rather have

but I couldn't find one anywhere

I must add though thats just personal preference and can't personally compare the two performance wise but surely they should both be capable of out performing the capability of any hybrid K04

daz-20vt · Nov 19, 2015

Yeh I see what you mean but if it's all about flow then one will be better than the other and I want the better one!

and I get what I want or I stomp my feet and hold my breath till I pass out!

also people keep saying about torque drop on the pro 4 and I don't want torque drop I want torque rise!

scotty_24 · Nov 19, 2015

Exactly. Even though mine had other issues it has torque drop at 5500k rpm. Could be coincidence. Could be the mani. Could be the pixies. God knows.
Its booked into Badger 5 early next year to have a dyno run to see what the map is now making with all the "fixes" and a possible map tweak if possible.

superkarl · Nov 19, 2015

scotty_24 said:
mine had other issues it has torque drop at 5500k rpm. .

This is cam related. All cars with stock cams will do this

badger5 · Nov 19, 2015

superkarl said:
This is cam related. All cars with stock cams will do this

except they dont all do this

daz-20vt · Nov 19, 2015

oh for God sake

I hate 1.8t's

superkarl · Nov 19, 2015

badger5 said:
except they dont all do this

Stock cams don't have torque drop off???

badger5 · Nov 19, 2015

superkarl said:
Stock cams don't have torque drop off???

~Context Karl

of course they do.. but the RATE of drop off is what varies a lot.. The "system" and how well its all working changes the rate at which the fall off occurs and how well it will cope with the demanded flow at the rpm.. Poor flowing systems die off on torque much quicker than happier setups..
I've had some cars come thru here with stock cams and making 500bhp... which obviously is'nt dead torque past 5krpm..

Your statement is too general, hence my comment. Past 6krpms and on hybrids, the torque indeed will fall away.. Baby turbos still in the scheme of things

I've not seen a v4 make good top end power apart from the one mutant, JE pistoned, low CR motor, and that only had peak power but way less torque than the lupo for example.. Interesting comparison of hybrids.. and their respective power/torque curves... The 2 best ones I've had here. My mani/hybrid/lupo.bog_stock aum engine compared to v4/hybrid/je_pistoned car.

superkarl · Nov 19, 2015

badger5 said:
~Context Karl

of course they do.. but the RATE of drop off is what varies a lot.. The "system" and how well its all working changes the rate at which the fall off occurs and how well it will cope with the demanded flow at the rpm.. Poor flowing systems die off on torque much quicker than happier setups..
I've had some cars come thru here with stock cams and making 500bhp... which obviously is'nt dead torque past 5krpm..

Your statement is too general, hence my comment.

I see. Thanks for elaborating

Miguel_S# · Nov 20, 2015

daz-20vt said:
oh for God sake

I hate 1.8t's

1.8t its lovely, but they need to breathe.
The best is B5 mani, a lot of dynos showing, there is no dought

scotty_24 · Mar 15, 2016

Just going through threads ive started making sure they are complete in case anyone has the same trials and tribulations I have had.
Just in case anyone ever needs this thread, with the new cylinder head (old one was cracked causing loss of compression. Refurbed BAM head with Supertech exhaust valves fitted)) the car made the power she was meant to!

First runs on the dyno with no map tweaks at all!
Graph shows last years Dyno for referance.

Bill then dialed in some more timing, no extra boosts and finally got up to this

And here's last years disappointment graphed up against what she runs today ! One happy Scotty.

To conclude this thread, porting from Bill at Badger5 was 100% worth it and in my opinion should be taken as a standard when fitting a hybrid.
Also make sure you compression test the car once its rebuilt from fitting rods and dont overlook the head.

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BBT K418T Porting hot side - worth it?

badger5

www.badger5.co.uk

daz-20vt

Registered User

S3 Hilife

It's an addiction

RB S3

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badger5

www.badger5.co.uk

S3 Hilife

It's an addiction

daz-20vt

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S3 Hilife

It's an addiction

daz-20vt

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scotty_24

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superkarl

MAN OF STEEL

badger5

www.badger5.co.uk

daz-20vt

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superkarl

MAN OF STEEL

badger5

www.badger5.co.uk

superkarl

MAN OF STEEL

Miguel_S#

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scotty_24

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