Help Troubleshoot Rb20 Cutting Out And Back In

[joe blo]

Hi mates need some help troubleshooting my beast. Rb20 with gt35. Haltech e11v2. Gt35. Surge tank,044, unknown feed pump.21psi high boost 12psi low

So I had it going good. Could pull through second gear on boost and slide all through second as long as you wanna hold it.

One day it was going good apart from a coil pack clip broke on cylinder 1 and when it comes loose it would misfire.

Only difference between that and the next day was I crimped the connectors down lore so it didn't come loose again and wasn't experiencing the misfire issue when new thing started.

I took it to drags and from first run was having problems. Would pull through first and then in second the whole car would basically cut in and out enough to throw your head forward then back she. It came back on then forward when it cut out again. Turned it to low boost and it cut out once at the start if second gear then pulled the rest of about another hundred metres.

Leads me to believe its fuel issue?

Some details about fuel setup. I ran the tank pretty low on gas when I moved house about a week prior to issue starting. Went to start it about 2 days later and the 044 that was I. It was dead. Turned out to be a chinarie I believe. Didn't have any markings like the genuine 044 I replaced it with.

Car was pulling all through second up the highway after replacement so not sure where problem is. Didn't drive for two more days after replacement and car running good the. Out fill tank of fuel in and went to drags.

Could it possibly be fuel filter?

Thanks mates

[joe blo]

On high boost it would cut in and out about 3 or 4 times in 200 metres. Low boost did it just once

[joe blo]

Any ideas mates?

[GTSBoy]

Did you change the fuel filter yet?

[Lrs94]

Boost leak ?

[Ben C34]

Get it to a dyno and get the tune checked.

That's a huge turbo for a 20 .

I would consider getting something better suited for some sensible response.

[Ben C34]

What injectors? I noticed in a wtb where you wanted a single rb20 injector......

[Joshbigt62r]

Get it on a dyno. Tune could be out now due to replacing the fuel pump.

[joe blo]

I replaced a 044 with a 044 so would think its the same tho the first one was prob china. Wouldn't the fuel reg accommodate any variances tho?

I haven't changed the fuel filter yet, haven't done anything.

My theory now is that the lift pump is dying and not keeping up enough allowing the 044 feed pump to drain the surge tank. Is that plausible. After some thinking the cutting out reminds me of pumping donuts in the old r33 without a surge tank back in the old days.

Is that theory plausible? The receipt from 2012 for the lift pump was $30 new so it prob wasn't a real good thing to begin with but was doing the job at least initially

[joe blo]

I wanna put a new lift pump in and beef up the wiring and fuel filter before I test drive it again

[GTSBoy]

I replaced a 044 with a 044 so would think its the same tho the first one was prob china. Wouldn't the fuel reg accommodate any variances tho?

No. If an old pump is low on pressure at high flow, then replacing it with a pump that doesn't fall off pressure at high flow results in rich mixtures up top. The pressure reg can't make pressure happen where it doesn't exist. Can only drop pressure down to a target.