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Old 26-11-2013, 02:59 PM
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Default Thoughts..? Stuttering on Boost!

Hey Guys

I just installed a VF28 STi turbo onto my MY99 wrx. Also installed a new exhaust as the old 3 inch was rusted out. While installing this I also put a new genuine O2 sensor. Since installing the VF28 my car stutters on boost. The idle is smooth, not erratic at all. No different to before the install but as soon as I hit boost the stuttering occurs. What are peoples thoughts..?


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Old 26-11-2013, 03:20 PM
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Has it been tuned since the install? Be my first stab..
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Old 26-11-2013, 03:30 PM
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Not tuned but I didn't think the VF28 was a huge upgrade over the TD04. Hence the MY99 ECU would relearn the new parameters.
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Old 26-11-2013, 03:35 PM
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What sort of condition was the turbo in? Ie the bearins, fins?
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Old 26-11-2013, 04:08 PM
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AFM is a possibility.

Computer to suit would help.
I changed from a TD04 to a VF35, but changed from a MY00 WRX ECU to a V6 STi ECU.
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Old 26-11-2013, 05:07 PM
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No play, fins undamaged. Can hear it spooling on boost.

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What sort of condition was the turbo in? Ie the bearins, fins?
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Old 26-11-2013, 05:15 PM
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Might have to get my V5 STi ecu installed aswell but will try a few other things first. Like AFM...

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AFM is a possibility.

Computer to suit would help.
I changed from a TD04 to a VF35, but changed from a MY00 WRX ECU to a V6 STi ECU.
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Old 26-11-2013, 05:21 PM
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Quote:
Originally Posted by Saint_23 View Post
AFM is a possibility.

Computer to suit would help.
I changed from a TD04 to a VF35, but changed from a MY00 WRX ECU to a V6 STi ECU.

I had same done to my MY00 thanks to Maximum Motorsport.

VF24 turbo, swapped ECU to V6 STI ECU (couple of wires to be swapped over).

Goes like a mofo!
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Old 26-11-2013, 06:27 PM
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In my previous wrx (97) it did this, would cough on boost had me worried might be map sensor.
Got in there and had a look, gave it a clean... Good as new.
Might not be this, however was a simple fix for a similar issue so I thought is throw this in here.


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Old 26-11-2013, 06:50 PM
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Too much boost? Injectors not keeping up?


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