Renix and boost

[cliché guevara]

Where does the black wire goto that feeds the Renix unit.I'm talking about the black wire that is on the double bullit connector which then goes into the loom then through the bulkhead.The grey wire goes to one of the green relays.

I had a sudden death experience the other day and would like to know if I have actually fixed the problem or if this will happen again.I suspect a relay has shat out but want to be sure as I have used the last of my Dad's get me home cards.

Also what pressure should my turbo be boosting at (in Bars please)?

 

[spryboy1974]

Sounds like an earth to me cliche,but can't be sure as haven't worked on one for a long time! :shock:
As for boost i think tou should be looking around 0.7 BAR standard.I used to run mine at 1 BAR with no problems.

 

[cliché guevara]

Well what I have is 7.5 volts on the grey on that goes to the relay and 3.5volts from the black one that goes wkw? The renix wont work unlessits bolted down and earthed with its "proper" earth.I get these readings with a working car however I dont know where the voltages can be dropped.If this is all normal then I'll stop worrying about it.However if I have an intermittent fault and not a dodgy relay I would like to sort it before I go to pose at the beach :wink:

 

[spryboy1974]

Sorry cliche,not sure then!

 

[supermario]

Hi,

I think the relais you're talking about shuts off the ignition in case of too much boost (0.7 bar) . The grey wire should be 12V (to ignition) If not, the relais could be bad. The black one should be the signal for your rev counter.
My relais was bad too and the car wouldn't start every now and then, so I remove it all.

 

[cliché guevara]

Hotdiggetydog!!!!Supermario you are indeed super

All my relays ar fine,the penny dropped when you said that the ignition shuts off in case of too much boost.My boost sensor has stayed open of shut (whichever)thus permanant shut down of the ignition.

Cheers all,off for a pose

 

[r5gordini]

Yes, that's how it works...

My contribution to this thread is that the standard boost pressure is 0.45bar, or 7psi...

Andrew

 

[cliché guevara]

Hello again on this subject.Car is now running very very well.I fitted a different boost guage to the original and the pressure is spot on what it should be.It just tries to hit the .5bar but wont.I have another little niggle though.If I'm in 2nd or 3rd gear and floor it to over take or just take off I get a cough before the magic happens.Just one big cough.Could I be running too rich?I already suspect that I'm running too rich but would like to sort this cough out.I'm using a K&N "Camembert" style air filter and 98 unleaded.

And lastly what bar can I safely take the pressure up to? :wink:

 

[supermario]

Glad to hear the car is running better
I think the car could be running to lean, this can cause a backfire. And you installed a K&N so the mixture is leaner unless you rejetted the carb. I would install the original airfilter and see how the engine reacts to that.
About the pressure I think you can go as far as when the engine starts to ping. That will be the first problem.

 

[sparkie]

check that your accelerator pump jet and assembly is working on the carb.

on the gt turbo SOLEX 32 DIS, there is a brass jet that squirts down the venturi as you stamp on the pedal. if it gets blocked or the mechanism gets stuck, then the car stutters and tries to die before picking up in between gear changes as you accelerate.
im assuming most carbs have the same mechanism....

 

[supermario]

Yes it has.

 

[cliché guevara]

I'll investigate but without any book it must be like looking for a piece of straw in a big stack of needles

 

[supermario]

http://www.ruddies-berlin.de/weber32DIR.htm

partnr. 29/30

 

[sparkie]

yeah thats the part.

the diaphram has a steel shaft set into it. and this slides inside the cover. it gets pushed in and out by the see-saw affair. the see saw and the shaft can corrode into the cover.

 

[cliché guevara]

OK interesting.28 29 30 have been changed as the original diaphraghm was leaking.I will have to check that the jet aint stuffed.