Fuel Supply or Other problem

epj7900

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May 18, 2005
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Greetings Sifus,

I hope to seek some advice.

As I have posted before on 4G63T Engine Block. Just to inform all that my car is almost done but I have a query.

My engine had been started and now I noticed that my Banana Manifold glows red in a short while. Any particular reason. It is the normal steel type and not the stainless steel. I have wrapped is with Thermal Wrap. Just after one round of testing - around the factory lot it's glwoing red. Even got flames !

Secondly I have fuel supply problem ! I suppose. The boost is at 0.7 bar and I have a SARD fuel pressure regulator. It is set at 3 bar. I am unable to hit 4k RPM because there seems to be fuel lag. WHen I rev the idling also does not come back to normal. Does the wastegate open when we ram at still ? Or is it only supposed to open when you are on the move ?

I need some professional advice on what are the areas I need to check. Plugs are new NGK Iriway 8. All injectors are original.

Thanks in advance people !
 

dolly

500 RPM
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Dec 24, 2003
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got flames at ur manifold? O_O

could be you are running extremely lean / have ignition timing issues. good luck! let us know whats up with it
 

epj7900

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May 18, 2005
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Ignition timing - could be the possible reason. Because engine is okay when we start - good idling but after pressing till 4 - 5K rpm it seems to come back unstable.

As you know I just did my overhaul - The engine had been left for days for running in. It has been stable. When it came down for testing thats when the issue started.

Initially it was very light.. I mean after getting rid of the balance shaft and doing engine balancing - the engine was cekap. Now it seems heavy.. I know it's got to do with the timing and fuel supply. Anyhow I suppose have to plug in the diagnostic tool to check the fuel burning.

Will update you guys.. but please also give me areas which could be the possible cause.

Cheers
 

EFN

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Dec 28, 2003
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3 BAR (44PSI) is a bit too high for your engine. I have installed and tuned a lot of 4G63T (VR4, EVOs) and 4G93T GSRs. Not one of them use anything above 44PSI no matter how big their turbo is. One EVO3 even run as low as 31PSI and one GSR 28PSI - tried and tested. So it might be a good idea tu tune down the fuel pressure a bit to around 36PSI and test it out.

Another thing is, you are running Cold Plug rating 8, so expect to see your engine behave weirdly while it is still not operating at maximum temp. It might be a good idea to set the ignition timing a bit Adcanced too.

Hope this helps.
 

epj7900

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May 18, 2005
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Johor Bahru
EFN said:
3 BAR (44PSI) is a bit too high for your engine. I have installed and tuned a lot of 4G63T (VR4, EVOs) and 4G93T GSRs. Not one of them use anything above 44PSI no matter how big their turbo is. One EVO3 even run as low as 31PSI and one GSR 28PSI - tried and tested. So it might be a good idea tu tune down the fuel pressure a bit to around 36PSI and test it out.

Another thing is, you are running Cold Plug rating 8, so expect to see your engine behave weirdly while it is still not operating at maximum temp. It might be a good idea to set the ignition timing a bit Adcanced too.

Hope this helps.
Somehow the problem had been solved.

It was the airflow sensor.

Very strange but after we took it out and cleaned it. It was perfect. But my Banana Manifold wastegate pipe broke. I suppose due to extreme heat.

Anyhow now they have sent it for welding.

I have reduced the fuel pressure to 2.8bar. Seems okay.

Thanks dude ! Cheers
 

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