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Plazmaman half intake

SLIXK

By SLIXK,
in Four Door Family & Wagoneers

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SLIXK

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Anyone have experience driving with this on their stagea without a tune? So basically the car stalls easily in first gear and acceleration is choppy in the low rpm’s once the car gets going it’s fine though. Is it just the fact that it doesn’t know what to do with all the extra air through the bigger throttle body? 

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joshuaho96 Veteran

joshuaho96

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13 minutes ago, SLIXK said:

So once tuned it should be fine surely ?

Probably yes, I'd make sure it isn't something else though with some experiments. Make sure the idle TPS voltage threshold is set correctly in the ECU and it's working correctly. I recommend pulling some ECU logs too to try and understand why it's behaving strangely.

GTSBoy Grand Master

GTSBoy

Posted
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Transient throttle shouldn't cause any problems on a MAF based ECU. Are we still stock ECU here?

The only real problem you can see from a larger TB (on stock MAF setup) is if the TB is simply too f**king large. Then even just a tiny amount of opening is too much for "just off idle" and it will always be a piece of crap to drive.

Joshua's mention of the TPS setting for throttle closed is a good one.

RBW49N Community Regular

RBW49N

Posted
Posted
2 hours ago, SLIXK said:

I didn’t carry out the work, one of the performance shops here in NZ did. But the Car idles fine if that helps..

So long as it’s connected to boosted air not just open as that will cause it to run a bit funny as well idle will still be good. How big is the throttle body? 66mm

SLIXK Collaborator

SLIXK

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2 hours ago, joshuaho96 said:

Probably yes, I'd make sure it isn't something else though with some experiments. Make sure the idle TPS voltage threshold is set correctly in the ECU and it's working correctly. I recommend pulling some ECU logs too to try and understand why it's behaving strangely.

How can I access this data, I’m still on factory ecu…

Edited by SLIXK
SLIXK Collaborator

SLIXK

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2 hours ago, GTSBoy said:

Transient throttle shouldn't cause any problems on a MAF based ECU. Are we still stock ECU here?

The only real problem you can see from a larger TB (on stock MAF setup) is if the TB is simply too f**king large. Then even just a tiny amount of opening is too much for "just off idle" and it will always be a piece of crap to drive.

Joshua's mention of the TPS setting for throttle closed is a good one.

I’m on stock ecu and stock MAF, I have haltech ready to go in when hotside is installed just waiting on appointments. Maybe the tuner will be able to tell me ?

SLIXK Collaborator

SLIXK

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1 hour ago, RBW49N said:

So long as it’s connected to boosted air not just open as that will cause it to run a bit funny as well idle will still be good. How big is the throttle body? 66mm

Im assuming it’s 72mm since I paid $585 through the workshop and it matches the size/price on the website..

joshuaho96 Veteran

joshuaho96

Posted
Posted
9 hours ago, SLIXK said:

How can I access this data, I’m still on factory ecu…

You need a consult cable unfortunately. If your tuner has one they can do some cursory checks on the dyno.

14 hours ago, GTSBoy said:

Transient throttle shouldn't cause any problems on a MAF based ECU. Are we still stock ECU here?

The only real problem you can see from a larger TB (on stock MAF setup) is if the TB is simply too f**king large. Then even just a tiny amount of opening is too much for "just off idle" and it will always be a piece of crap to drive.

Joshua's mention of the TPS setting for throttle closed is a good one.

Isn't transient throttle in these ECUs mapped based on the TPS voltage derivative? It's all kind of a vague guess but I would expect a bigger throttle body to potentially introduce too much air too quickly in transients.

GTSBoy Grand Master

GTSBoy

Posted
Posted
1 hour ago, joshuaho96 said:

Isn't transient throttle in these ECUs mapped based on the TPS voltage derivative?

Yeah, but it's only a bit of a massage around the outside edges of the MAF based load-TP calc anyway. In this particular instance, unless he put a simply massive TB on there, the factory mapping should be fine to handle it.

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