RobDon's Leon -

[RobDon]

I have a brand new bracket infront of me if you want that one?

Bracket received and fitted, great stuff! Part number is 06A121066D so Roly was right.

 

[PhilW]

http://www.mototuneusa.com/break_in_secrets.htm

 

[RobDon]

Seen that before, I think I'm doing the right thing going by everything I've read. I'm going raise the boost to 1.2 BAR at 500 miles then 1.5 BAR at 1k miles.

 

[RobDon]

Alternator pulley removal tool is here so can do all 3 pulleys soon. I have raised the boost to 1.3 BAR and so far it doesn't feel like the JBS manifold is restricting anything yet, so far so good. I'm going to set the Apexi to 1.3 BAR for low boost and 1.6 BAR for high boost. Almost at 500 miles so half way there!

 

[Willie]

Rob, might get a shot of the pulley puller when your finished with them.
I need to pull the pulley attached to the crank as my crank case seal is is leaking will do this when i do my timing belt and oil pump change.
500 miles till fun time

 

[brightsideteeem]

good stuff

 

[RobDon]

The alternator tool isn't suitable for the crank, it's only for clutch-type alternator pulleys.

 

[Willie]

Ah, thanks

 

[RobDon]

Well I think the JBS manifold IS a restriction, I took the boost up to 1.6 BAR today and to get it there I had to increase the duty cycle on the Apexi from 62% to 70%, so the turbo is having to try harder to make boost, previously 1.5 BAR was at 62% duty cycle. It doesn't feel like it pulls as hard as before either.

Now I wish I hadn't sold the tubular manifold.

 

[air121005]

.......so are you planning on replacing the JBS manifold, getting another tubular one maybe?

 

[barnsley]

Well I think the JBS manifold IS a restriction, I took the boost up to 1.6 BAR today and to get it there I had to increase the duty cycle on the Apexi from 62% to 70%, so the turbo is having to try harder to make boost, previously 1.5 BAR was at 62% duty cycle. It doesn't feel like it pulls as hard as before either.

Now I wish I hadn't sold the tubular manifold.

not good

if you selling the apexi im looking for one Rob

 

[Murdered LCR]

My mate adam brought the tig art mani off you I must admit its an awesome bit of kit the car pulls so much better and spool up is silly quick now . Shame the jbs one isn't as good / better than the tig art one

 

[RobDon]

Looks like I'll be taking the JBS one off yes, to be replaced with what I don't know - another TIG-ART tubular one most likely yes. I'll reserve full judgement for now though and wait until the engine is fully run in, it is possible that things are still tight from the rebuild, hence not pulling as hard.

Yes I will probably be selling the Apexi yes, going to fit a Forge UNOS MBC and try it out first though.

 

[JBS Sales]

Well I think the JBS manifold IS a restriction, I took the boost up to 1.6 BAR today and to get it there I had to increase the duty cycle on the Apexi from 62% to 70%, so the turbo is having to try harder to make boost, previously 1.5 BAR was at 62% duty cycle. It doesn't feel like it pulls as hard as before either.

Now I wish I hadn't sold the tubular manifold.

Hi Rob,

We have run our JBS04 to 1.8 bar spike and 1.5 constant and have no flow
issues at all, we are very happy with the flow of the cast manifold.

As we have said in other posts, the cast manifold is an OEM upgrade and not a direct replacement for the tubular item.

Let us know of your progress with the cast manifold.

Thanks

JBS Developments

 

[RobDon]

I'll run the engine fully in before making any decisions on it - but so far it pulls well and holds boost, just doesn't feel as strong as it used to with the tubular manifold.

Maybe I should buy a hybrid K03S turbo!

 

[JBS Sales]

I'll run the engine fully in before making any decisions on it - but so far it pulls well and holds boost, just doesn't feel as strong as it used to with the tubular manifold.

Maybe I should buy a hybrid K03S turbo!

Hi Rob,

If you have had a full engine rebuild, then your engine will be tight.

An 8% change in the duty cycle doesn’t directly correlate to a poor flowing manifold. You are effectively running a different engine, so the change in duty cycle could be due to a number of things caused by splitting the engine, for example a small air leak or actuator adjusted slightly different?

We have spent thousands of pounds designing and developing this manifold, using the latest flow analysis and flow testing equipment and software.

As we have said many times, all the runners have an equal internal cross sectional area, all the way from the head flange, into the turbo. So the fact that it “looks” restrictive does not mean a great deal. Improved flow figures mean nothing if the exhaust gasses don’t flow in the right direction.

The JBS cast manifold design improves spool time as the exhaust gas energy is used more efficiently due to no port sharing and the design of the collector, flowing the exhaust gasses directly into the turbo.

This is shown by the fact the manifold will allow your turbo hold 1.5 bar all the way through the rev range.

Along with the time spent concentrating on improving flow, we have also made the manifold easy to fit and with the use of modern cast stainless steel alloys, extremely reliable compared to the cast iron “performance” manifolds.

So we might be able to help you out, have you measured the current EGT’s, do you know what they were before the manifold was fitted? What cylinder filling is being requested by the ECU (requested boost)??


Thanks

JBS Developments

 

[Robbie C]

*watches with anticipation

 

[RobDon]

Excellent points, perhaps I was harsh in saying what I said, given it's the first time I've turned the boost up since the rebuild - my apologies. Time will tell how things go once the engine is run in.

 

[RobDon]

Having done the rods recently, I am now looking for more power because I know the engine can handle it now! The two options I'm considering is the JBS IHI turbo kit or a CR Turbos hybrid K04-022 and the JBS K04 manifold, Piper RS downpipe and CAT, etc., both offer around the 350bhp mark. I think both end up around the same price, around £2300 and I think after looking at all my existing turbo parts I could get around £1200 for my stuff.

We'll see what the new year brings!

 

[Damoegan]

Have you seen this, Rob ? http://www.seatcupra.net/forums/showthread.php?t=241026