Engine cutting at full boost

Sjuforti · Feb 10th, 2020, 11:44

struggles with cutting at full turbo pressure, but if I'm very careful on the gas I can pull it further.
If the car is at a standstill and one gases it is apparently completely fresh.

Recently converted to lh2.4 from 240 and b230fk from 940

Setup:
org nozzles with working resistance
China turbo which charges 0.6-0.7
Org high pressure pump in tank
962 petrol brain with viking chip
gold Brain

Things checked:
Knock sensor
Temp Sensor
AMM
Both brains
Ignition Module
Plug wires and plugs are replaced
Distributor lid and rotor
Flywheel Sensor
pump relay
gasoline Press

Also have problems with it dripping oil from air filter, pretty sure it comes from turbo due to poor oil return, is turbo throw then? Is a fairly new.

Laird Scooby · Feb 10th, 2020, 12:08

It sounds as if your PCV system needs a good clean out for a start, second, was the LH2.4 system for a turbo car or not?

Also whn you say full boost, what pressure?

Sjuforti · Feb 10th, 2020, 12:37

The lh2.4 is from a car without turbo, but its all the same, it just misses the resistance in front of the nozzels, but i have fixed that. It runs on 0,6 bar

Laird Scooby · Feb 10th, 2020, 12:41

Quote:

Originally Posted by Sjuforti

The lh2.4 is from a car without turbo, but its all the same, it just misses the resistance in front of the nozzels, but i have fixed that. It runs on 0,6 bar

That's higher than a normal FK and the advance/retard curves for the ignition are different for the turbo ECUs. I take it from what you've said you've added an injector resistor pack then?

TonyS9 · Feb 10th, 2020, 12:50

So you have a chip without any air flow limit cut out?

Does the rpm need drop suddenly in the fault condition or remain correct to the rpms?

Does the engine cut completely or just lose some power?

Nozzles = injectors?
You are measuring 0.7bar boost on a gauge?

Can you check the O2 sensor output? Are you getting lean condition before cut? Should be rich at 0.7bar. Starting to get lean at 0.9bar, but orginal injectore can support 1bar without going so leans it cuts out.

Sjuforti · Feb 10th, 2020, 12:57

Yes, i added resistor pack and im driving with chipped 962 fuel brain. It cuts completely. Yes injectors. Im measuring the boost. It is possible to not make it cut, if i push the trottle down slow. I can check o2 output when i get home.

martin_r_smith · Feb 10th, 2020, 19:24

Sounds like spark blow out. Reduce the gap on the plugs to 0.6mm and try again, Ngk br7es work well with higher boost too.

TonyS9 · Feb 11th, 2020, 02:56

What about the rpm needle question?

Also is this in a 940?

The O2 is difficult to get at, but you can access a small bit of unshielded green cable at the connector in the engine bay.

Feb 10th, 2020, 11:44	#1
Sjuforti New Member Last Online: Feb 12th, 2020 07:27 Join Date: Feb 2020 Location: Søndeled	Engine cutting at full boost struggles with cutting at full turbo pressure, but if I'm very careful on the gas I can pull it further. If the car is at a standstill and one gases it is apparently completely fresh. Recently converted to lh2.4 from 240 and b230fk from 940 Setup: org nozzles with working resistance China turbo which charges 0.6-0.7 Org high pressure pump in tank 962 petrol brain with viking chip gold Brain Things checked: Knock sensor Temp Sensor AMM Both brains Ignition Module Plug wires and plugs are replaced Distributor lid and rotor Flywheel Sensor pump relay gasoline Press Also have problems with it dripping oil from air filter, pretty sure it comes from turbo due to poor oil return, is turbo throw then? Is a fairly new.

Feb 10th, 2020, 12:08	#2
Laird Scooby Premier Member Last Online: Today 00:28 Join Date: May 2012 Location: Lakenheath	It sounds as if your PCV system needs a good clean out for a start, second, was the LH2.4 system for a turbo car or not? Also whn you say full boost, what pressure? __________________ Cheers Dave Next Door to Top-Gun with a Honda CR-V & S Type Jag Volvo gone but not forgotten........

Feb 10th, 2020, 12:57	#6
Sjuforti New Member Last Online: Feb 12th, 2020 07:27 Join Date: Feb 2020 Location: Søndeled	Yes, i added resistor pack and im driving with chipped 962 fuel brain. It cuts completely. Yes injectors. Im measuring the boost. It is possible to not make it cut, if i push the trottle down slow. I can check o2 output when i get home. Last edited by Sjuforti; Feb 10th, 2020 at 13:04.

Feb 10th, 2020, 19:24	#7
martin_r_smith Premier Member Last Online: May 10th, 2022 21:01 Join Date: May 2009 Location: Wiltshire	Sounds like spark blow out. Reduce the gap on the plugs to 0.6mm and try again, Ngk br7es work well with higher boost too. __________________ 1983 244

Feb 10th, 2020, 12:37	#3
Sjuforti New Member Last Online: Feb 12th, 2020 07:27 Join Date: Feb 2020 Location: Søndeled	The lh2.4 is from a car without turbo, but its all the same, it just misses the resistance in front of the nozzels, but i have fixed that. It runs on 0,6 bar

Feb 10th, 2020, 12:50	#5
TonyS9 Premier Member Last Online: Apr 9th, 2024 21:44 Join Date: Jul 2009 Location: Holywood	So you have a chip without any air flow limit cut out? Does the rpm need drop suddenly in the fault condition or remain correct to the rpms? Does the engine cut completely or just lose some power? Nozzles = injectors? You are measuring 0.7bar boost on a gauge? Can you check the O2 sensor output? Are you getting lean condition before cut? Should be rich at 0.7bar. Starting to get lean at 0.9bar, but orginal injectore can support 1bar without going so leans it cuts out.

Feb 11th, 2020, 02:56	#8
TonyS9 Premier Member Last Online: Apr 9th, 2024 21:44 Join Date: Jul 2009 Location: Holywood	What about the rpm needle question? Also is this in a 940? The O2 is difficult to get at, but you can access a small bit of unshielded green cable at the connector in the engine bay.

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