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PostPosted: Fri Jun 29, 2012 11:30 pm 
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Reading a couple of threads regarding where fuel cut is. Does anyone actually know at what boost level fuel cut occurs. Everyone has a different idea and i have not found mine yet.

I'm running 1.31 bar of boost externally waste gated and managed by a HKS EVC with no problem.

Also does anyone know the limit of the head gasket and failure.

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PostPosted: Sat Jun 30, 2012 12:17 am 
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Location: Camberley, Surrey
Car Model: ST205
What model car do you have?

Assuming its a ST205 fuel cut is at 1.2 bar. Clearly this will be subject to some differences depending on the car but running a consistent 1.3+ bar would suggest to me that you may have an FCD hiding somewhere or a pressure leak in the line to the MAP sensor.

The head gasket on a ST205 is generally not a problem being an all metal type as standard. On the ST185 the limit of the head gasket is around 1.0 bar.

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PostPosted: Sat Jun 30, 2012 11:00 am 
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Sirius,

The car is ST205 WRC i cannot seem to find any FCD as its very very bare on the inside being a track car, nor is there any pressure leak on the MAP sensor because we checked all that. Its a bit puzzling to be honest.

If the head gasket is a multi layed type i will up the boost a bit more and see what happens.

It is due to go for a Syvec ECU shortly so Ryan may be able to shed some light on it

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PostPosted: Sat Jun 30, 2012 11:10 am 
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Location: Camberley, Surrey
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Yes that is quite strange. The FCD is usually quite small and tucked in the wiring loom somewhere.

When I bought my car it had a HKS FCD fitted that I quickly removed this was hidden behind the glovebox near the ECU.

I wouldn't really recommend upping the boost much more, the temperatures will start getting high and if an FCD is fitted your fueling may not be correct. It is generally considered that 1.2 bar is the 'safe' limit of the stock setup. Many people do run more boost than this but typically not for very long.

A few other things to consider:

Is it s JDM version? These cars often have hidden goodies fitted such as alternative ECU's etc.

Is the car running a standard ECU?

Where are you measuring your 1.3 bar from? Is that the boost as reported by the HKS EVC? I had one of these on my car originally (the EVC 5) and found it to be quite poor at both controlling the boost and reporting it - my boost gauge usually indicated different boost levels.

If you don't have a separate boost gauge fitting one would be an easy way to verify the figures. :)

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PostPosted: Sat Jun 30, 2012 8:25 pm 
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Yes it is a Mr Jap import, I never gave it much thought regarding any sort of after market ecu. Because I always knew it was going to be fitted with a syvec one so therefore never bothered looking to see what it's running. I will have a look tomorrow. I don't have much dash board left in the car as it was removed when roll cage was welded in.

The car is externally waste gated and holds a very steady 1 bar when the hks EVC is off. Once on it will happly hold 1.31 bar which is consistent when compared with the defi bf boost gauge also fitted. Both read identical levels throughout any duty cycle.

I closely monitor all air fuel ratios via a aem wide band sensor, a whole host of defi gauges including egt. All are in very happy limits.

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PostPosted: Sun Jul 01, 2012 12:12 am 
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Location: Camberley, Surrey
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A mystery then! :D

Do you have any pictures of your car?

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PostPosted: Sun Jul 01, 2012 12:29 pm 
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PostPosted: Sun Jul 01, 2012 1:03 pm 
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Location: Camberley, Surrey
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Great looking car with whats looks to be a nicely thought out set of modifications. :)

Did you do much of it yourself or previous owner?

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PostPosted: Sun Jul 01, 2012 4:56 pm 
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Yes all my hard work along with a good friend Nito (forum member).

Things left to complete include
1) Flocking dash board
2) MSA fire extinguisher
3) MSA Kill switch
4) Phormula Knock control close loop to ecu
5) Syvec S6 ecu
6) Get rid of the crap Tein coilovers and get Nitron
7) Secure sponsership GT4DC perhaps?

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PostPosted: Mon Jul 02, 2012 10:33 am 
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Pagey. Your build is very logical and probably one of the most sensible one I've seen.
Can you tell me who built your roll cage?
Also are you till running stock turbo?
Are you still using stock manifold with a welded external wast gate?
Is the screamer pipe welded back into the down pipe?
Who made this for you or where did you get it from?


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PostPosted: Mon Jul 02, 2012 1:24 pm 
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Roll cage is by Nickson Motorsport

Turbos is Garret 3071r with 4 inch compressor housing anti surge ported. - The response and pick up is amazing.

Yes i am using stock manifold which have been informed will happly cope with power upto 500ish bhp (data given to me by TB Developments)

TB Developments custom made a sandwich plate that sat between the turbo and manifold.

Yes the screamer pipe returns back to the down pipe which TB Developments also custom made for me.

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PostPosted: Mon Jul 02, 2012 2:29 pm 
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How is the engine performing with the standard ECU controlling the large turbo?

The Syvec is also an interesting choice of ECU, what was your rational behind it? I am starting to research ECU's for my build and am investigating a few options although Syvec wasn't one of them.

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PostPosted: Mon Jul 02, 2012 8:37 pm 
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Sirius,

Your question about standard ecu managing the upgrades has brought me full cycle and why i started the thread in the first place. I have a feeling i'm not running a standard ecu.

Fuel cut? Don't seem to have one (nor FCD) when the car first arrived in the UK it was running without a boost controller but running over 1.2 bar.

At 1.3bar im seeing 840 degree egt and 10.8 on the AFM wide band which is very rich for standard ecu unless they were mapped very conservatively to begin with. These sort of readings i'm very happy with.

Last friday when i was out and about and doing a bit of testing etc i noticed that on a steady incline on half throttle motorway driving i saw 940 degree egt which i was a little suprised about. We put it down to bigger more effeifent turbo producing boost perhaps where the stock turbo may not of done therefore may of run a little lean.

As for ECU choice
HKS F-con - had one in my R32 GTR 723hp very good ecu old technology can't map it. Need to be f-con dealer

Apexi power FC - old technology and simply does not offer the features i'm after. Although can you map them yourself never looked into the software.

Link G4 - did give this sum serious consideration however good point software available to map yourself bad point no UK dealer support - offers all the same as syvec so still a good choice

Syvec i choose from reccommendation from time attack team SVA Imports, its packed full of features software available to map yourself, UK support, muiltiple maps switchable, i like that it continues to monitor all the cars life lines and takes action to completly safe guard the car. Completely compatible with closed loop phormula knock.

AEM - I would avoid like the plague Nito on this forum nearly blow his top secret R34 engine up on the rollers at Abbey Motorsport with this type of ecu it was a shocking ecu.

I would love to here what your thought's are on the ECU's you are considering, what are your options and why did Syvec not get a look in. I'm no expert but if racing teams are running them and doing well that's good enough for me.

PM me your number i wouldn't mind having a chat with you.

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PostPosted: Mon Jul 02, 2012 9:13 pm 
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If I were a betting man I would think odds on your not running the standard ECU. I might be wrong but particualy if you are still on standard injectors I am not sure the car would be running very well.

940deg is pretty high and would suggest that maybe its starting to run lean possibly under certain conditions.

10.8 AFR actually is fairly normal from my knowledge, lots of them run richer than that.

With regards to the ECU choice, I am only just starting my research and so far have considered:

Motec - widely used in the GT4 community but expensive and quite old tech for affordable ones.

Apexi PFC - widely used but now very expensive 2nd hand in my opinion. I had one a few years ago that I bought cheap and then sold due to not using it, I regret that now as I could have doubled my money!

Link - The current front runner due to plug and play and also a number of them in the community.

I had heard something about the Syvec being locked down somehow and you couldn't easily access the maps - I cant remember where I heard that or if there is any truth in it. There are so many systems out there the choice is bewildering.

I'll put the Syvec back on the list for consideration.

I'm also going to rename this thread to get some more attention from others. :)

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PostPosted: Mon Jul 02, 2012 9:44 pm 
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Both the Link and the Syvec can be locked down, stops idoits like me adjusting them to fine tune once on circuit. Locking them gives some protection to the original mappers if anything goes wrong. That's why the Syvec is so good if you completly screw the map up the ecu just turns the engine off! You can ask the mapper to leave the ecu unlocked its your ecu at the end of the day.

SVA's time attack car does not not even run with any guages anymore there is no need that's how confident they are with it.

I too thought Motec was a fortune and i don't think its as good as the Link G4

Good idea renaming thread i would love to know what other's are doing and the direction they are going in with regards to ecu management and who mapped theirs

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