can't figure out where the overboost switch is. - Page 2

stevieturbo · Mar 16th, 2011, 23:31

Or just fit a proper management system and tune it properly and safely.

Enginer01 · Dec 23rd, 2019, 00:42

post for info only...
The ECU monitors the signal from the MAF and at about 225 hp (my 740T) turns off the injectors. I do not know (yet) if it just stops grounding the injectors, or if it turns off the Fuel Injection Relay, thus killing the Radio Interference Suppression Relay, BUT I Will FIND OUT!
Note, when this happens while passing a fast Mustang, it's embarrassing.

TonyS9 · Dec 23rd, 2019, 01:03

I think it just stops firing the injectors when it hits a certain air flow / load.

To remove it you need to change the fuel chip, plenty available on ebay or made to custom injectors or use the bigger maf with matching injectors etc

mhuk · Dec 24th, 2019, 10:18

I have an over boost switch. It goes from 10psi to 15psi and the fun starts. ;-)

I'll get my coat!

Dec 24th, 2019, 10:18	#14
mhuk Senior Member Last Online: Mar 1st, 2024 08:41 Join Date: Mar 2009 Location: London	I have an over boost switch. It goes from 10psi to 15psi and the fun starts. ;-) I'll get my coat! __________________ Volvo 940 19T, Charge cooled, Chipped.

Mar 16th, 2011, 23:31	#11
stevieturbo Member Last Online: May 10th, 2023 17:58 Join Date: Dec 2010 Location: Antrim	Or just fit a proper management system and tune it properly and safely.

Dec 23rd, 2019, 00:42	#12
Enginer01 New Member Last Online: Dec 23rd, 2019 00:44 Join Date: Dec 2019 Location: Lithia	post for info only... The ECU monitors the signal from the MAF and at about 225 hp (my 740T) turns off the injectors. I do not know (yet) if it just stops grounding the injectors, or if it turns off the Fuel Injection Relay, thus killing the Radio Interference Suppression Relay, BUT I Will FIND OUT! Note, when this happens while passing a fast Mustang, it's embarrassing.

Dec 23rd, 2019, 01:03	#13
TonyS9 Premier Member Last Online: May 19th, 2024 20:22 Join Date: Jul 2009 Location: Holywood	I think it just stops firing the injectors when it hits a certain air flow / load. To remove it you need to change the fuel chip, plenty available on ebay or made to custom injectors or use the bigger maf with matching injectors etc

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