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post #1 of 28 Old 6th April 2019, 01:03 PM Thread Starter
Awbimmer
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Charged - ESS VT2 675

Hi guys,

I recently installed my charger in my garage and man oh man, what a beast it has become now. It drives so well and goes like bat out a cave. Literally pins me back to the seat with much more mid range torque. I will do a full review of fitting and my initial thoughts plus dyno results in a few weeks but I have an issue since charging, and hope someone can help me with it.

My cold starts are great / normal but warm starts are not. It hesitates to fire up even though it'll crank. Sometimes it'll keep cranking and not fire up. Sometimes it'll crank a lot more than normal and fire up. One other time, I had to press the gas pedal while it was cranking to get it to fire up but that was an anomaly. If I had a leak in my fuel system the car wouldn't drive so well or it'll misfire or it'll idle rough. But it doesn't it idles around 925rpm.

Some background info:
75.5k miles (owned since 62.5k)
New battery 2 years ago - Bosch AGM 850cca
Batt voltage 14.1v running // 13.1v with IGN on
Fuel pressure is 3.5 - 4bar on idle / 7bar on startup
Fuel pump changed / fuel filter changed / carbon canister changed / fuel cap changed / fuel tank changed / spark plugs changed / new larger injectors as part of ESS kit installed - all in the last 100 miles
Throttle actuators changed

Lots of other preventative things done but this problem has started since installing the charger. I'm confident it cannot be anything big because it drives and runs like a dream. I will be doing a smoke test sometime to check there but can anyone think of anything please?
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post #2 of 28 Old 6th April 2019, 08:19 PM
Craze
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I think it may take time to adapt

Best to ask ess

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post #3 of 28 Old 6th April 2019, 09:47 PM Thread Starter
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Quote:
Originally Posted by Craze View Post
I think it may take time to adapt

Best to ask ess
I have asked several times and they've said to reload the tune which hasn't helped. They've also said to check other things but I've already tackled them.

Very interesting situation....

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post #4 of 28 Old 6th April 2019, 11:48 PM
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I might be wrong cause I don't remember exactly, but fuel pressure range should be more narrow around 3.9-4bar. I would double check that on ISTA

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post #5 of 28 Old 7th April 2019, 12:57 AM
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Ive owned a number of cars and once ive modded them heavily eg motors or heads and cam etc ive always had niggling issues starting from time to time depending on ambient temps and elevation etc
Ive learned to live with it as annoying as it can be

But when it runs it never cuts out? I had an issue with mine cutting out (non sc m5 e60) and was from the power pulley
Tuners dont compensate for charging reduction and idle calculations etc
New battery and stock pulleys never had an issue
Spent like $5000 trying to fix that problem

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post #6 of 28 Old 7th April 2019, 01:05 AM Thread Starter
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Quote:
Originally Posted by Pav View Post
I might be wrong cause I don't remember exactly, but fuel pressure range should be more narrow around 3.9-4bar. I would double check that on ISTA

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That's right. Pretty sure mine is in that range.

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post #7 of 28 Old 7th April 2019, 01:07 AM Thread Starter
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Quote:
Originally Posted by Craze View Post
Ive owned a number of cars and once ive modded them heavily eg motors or heads and cam etc ive always had niggling issues starting from time to time depending on ambient temps and elevation etc
Ive learned to live with it as annoying as it can be

But when it runs it never cuts out? I had an issue with mine cutting out (non sc m5 e60) and was from the power pulley
Tuners dont compensate for charging reduction and idle calculations etc
New battery and stock pulleys never had an issue
Spent like $5000 trying to fix that problem
When it starts it never cuts out or I'm yet to experience that (hopefully it doesn't happen). Wow, $5k is not a small amount trying to chase down an issue.

At this rate it could be one of many things:

Crankshaft Sensor
Camshaft sensors
Alternator
Battery
Coolant temp sensor
Leaking fuel injector
Etc.

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post #8 of 28 Old 7th April 2019, 03:53 AM
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Personally id try a battery next

Surely it cant be a sensor otherwise it wouldnt run correctly

how hot is it where u live?

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post #9 of 28 Old 7th April 2019, 08:04 AM Thread Starter
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Quote:
Originally Posted by Craze View Post
Personally id try a battery next

Surely it cant be a sensor otherwise it wouldnt run correctly

how hot is it where u live?
Live in the UK not far from London so currently on average its 55 Fahrenheit.

My battery is 12.1v with ign and 14.1v idling. Does that show its weak?

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post #10 of 28 Old 7th April 2019, 08:42 AM
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