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Old 10-17-2020, 12:00 PM   #1
m5gorrf
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Default Differences when a VF48 replaces a TD04, Advice Pls

Thanks for reading!

I am looking for others experiences and any concerns when a VF48 replaces a TD04.

I am only looking for better top end power for passing for now. The motor has almost 200K miles on it and has had head gaskets in the last 25K, with reasonable compression.

2006 WRX Wagon
Larger aftermarket TMIC
Cobb DP and 3" to the rear
Stage 2 accessport tune with proper pill in vac line
Silicon inlet

If the VF48 for now, was forced to behave like the TD04 other then better top end for passing over 80mph, I would be find. I have a STI shortblock sitting waiting for B25 heads then when time allows an engine swap. Also a full tune at that time.

Should I remove the pill from the wastegate vac line?
Other suggestions or things I should be aware of.

Thanks again
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Old 10-17-2020, 01:10 PM   #2
Unabomber
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https://forums.nasioc.com/forums/sho....php?t=2740715 needs to be followed to the letter. Your care is old and there are things that need looked at. There is no way to make a VF48 behave like a TD04, that's an upgrade and needs supporting mods and a tune.
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Old 10-17-2020, 01:56 PM   #3
m5gorrf
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Thanks, owned from new, all fluids change well before normal schedule. All plastic / rubber parts inspected / stressed or changed.

'Not behave the same' what do you suspect the VF48 will do or how will it be different?
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Old 10-17-2020, 08:45 PM   #4
LAS04subie
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You would need some injectors and a tune at the very least. You canít just throw on the turbo and hope itíll work out.
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Old 10-17-2020, 10:28 PM   #5
Dave D.
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Quote:
Originally Posted by m5gorrf View Post
Thanks, owned from new, all fluids change well before normal schedule. All plastic / rubber parts inspected / stressed or changed.

'Not behave the same' what do you suspect the VF48 will do or how will it be different?

When I put a VF39 on top of my catted downpipe and stock exhaust, I gained nearly 70whp/tq compared to the TD04. It did need a new tune.

It's the single biggest bang for the buck on that car, as it already has the injectors to handle it (same as Sti injectors for the same year). You do NOT need new injectors! This argument has been settled numerous times. I did install an Sti intercooler I picked up for $150 at the time. A Walbro 255 fuel pump probably wouldn't hurt, either.



The car was a monster compared to its old self, with tremendous pulling power up top. (As time went on I got used to it, of course!)
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Old 10-18-2020, 12:20 AM   #6
m5gorrf
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Quote:
Originally Posted by Dave D. View Post
When I put a VF39 on top of my catted downpipe and stock exhaust, I gained nearly 70whp/tq compared to the TD04. It did need a new tune.

It's the single biggest bang for the buck on that car, as it already has the injectors to handle it (same as Sti injectors for the same year). You do NOT need new injectors! This argument has been settled numerous times. I did install an Sti intercooler I picked up for $150 at the time. A Walbro 255 fuel pump probably wouldn't hurt, either.



The car was a monster compared to its old self, with tremendous pulling power up top. (As time went on I got used to it, of course!)
Did the VF39 spool slower at bottom end compared to the TD04?

I was hoping to install the VF48 & drive it to the tuners.

I will most likely hold off installing the VF48 until the engine swap as it needs to be tuned for the STI motor anyway. Just thought the ECU might be able to control the VF48 & not let it change the performance envelope other then better power top end..

Thanks for all the input.
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Old 10-18-2020, 12:50 AM   #7
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You can install it and use a cobb ots vf39 map with all the other appropriate supporting mods to drive to the tuner. Just stay out of boost.
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Old 10-18-2020, 11:30 AM   #8
m5gorrf
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Great advice thanks
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