New Owner - Help/advice please

New Owner - Help/advice please

Author
Discussion

QBee

21,371 posts

150 months

Friday 25th July 2014
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Simple rule. If you left the lambdas in the exhaust manifolds, you don't need the tune resistor. And vice versa

SirSagalot

Original Poster:

176 posts

187 months

Friday 25th July 2014
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Thanks. Andy at APM fitted the Y piece as the manifold gaskets needed changing and the pre cats were removed so I don't know the answer. I've had the Y piece on for a few hundred miles now and the problems only started after the breather hoses and trumpets were changed.

QBee

21,371 posts

150 months

Friday 25th July 2014
quotequote all
He doubtless got it right. Mat Smith installed mine, left the lambdas in (you would) and didn't install the multi position resistor as it wasn't needed. Yours is a 99 car IIRC, so will be like mine, lambdas still in, no resistor

SirSagalot

Original Poster:

176 posts

187 months

Friday 25th July 2014
quotequote all
Thanks Anthony. Hope you are well.

QBee

21,371 posts

150 months

Friday 25th July 2014
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Fine thanks Lev. Hope you are too. Very pleased to see you have seen sense and bought a proper TVR at last hehe

How's the sporty satsuma going?

blitzracing

6,409 posts

226 months

Saturday 26th July 2014
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You dont need to change the tune resistor- this is a bad thing to do unless you know what the non catalyts map is in your chip- its very likely to be stock Range Rover. I have a TVR 3.9 catalyst map in my Ginetta, but when I switch to non cat it feels OK, but is see it runs horribly lean at 3500 plus RPM. I would not have known without an AFR meter. As for the stepper motor- if you line the old and new one up side by side- look at the lengh of the shaft behind the cone- the pattern ones can be about 3mm longer, so the travel is wrong

davep

1,143 posts

290 months

Saturday 26th July 2014
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If you do not have a NAS version of the 14CUX code, where the code is locked to Map 5, or have not modified the Tune Resistor code to do the same, the car will need a tune resistor irrespective of whether lambda sensors are fitted or not. The value of the resistor will define whether the EMS will run in open loop or closed loop (when appropriate). When there is no tune resistor fitted to the 14CUX ECU or the resistance value is too high the code will cause Map 0 (Limp Home Map) to be selected.

QBee

21,371 posts

150 months

Saturday 26th July 2014
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Funny you should say that. It's what I would have expected, but it's not what I was told by Clive, as far as I remember. My tune resistor is sitting on top of Mat's filing cabinet and the car has never selected map 0. I will email Clive to see what he says.

davep

1,143 posts

290 months

Saturday 26th July 2014
quotequote all
QBee said:
Funny you should say that. It's what I would have expected, but it's not what I was told by Clive, as far as I remember. My tune resistor is sitting on top of Mat's filing cabinet and the car has never selected map 0. I will email Clive to see what he says.
QBee if you have RoverGauge would you mind connecting it in and with the car running in idle do a screen capture? If you could post it here or send via a PM, I'd appreciate it.

OleVix

1,438 posts

154 months

Saturday 26th July 2014
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Tried the non cat map my self, with a resistor, went like a dog, horrible response!

QBee

21,371 posts

150 months

Saturday 26th July 2014
quotequote all
davep said:
QBee said:
Funny you should say that. It's what I would have expected, but it's not what I was told by Clive, as far as I remember. My tune resistor is sitting on top of Mat's filing cabinet and the car has never selected map 0. I will email Clive to see what he says.
QBee if you have RoverGauge would you mind connecting it in and with the car running in idle do a screen capture? If you could post it here or send via a PM, I'd appreciate it.
Mislaid the cable when I moved house last year. If I come across it I will do so.