2006 wrx VF39 swap

[Travis@COBB]

Your best bet for more power is a ProTune. We keep the OTS maps for aftermarket turbos conservative since it is difficult to predict how each vehicle will behave or respond to different modifications. I would also recommend larger injectors as you seem to be maxing out your injectors.

[derekrobertskilling]

Thanks travis. Would you say that the stock Fuel Pump should be OK? i live in Maryland and was thinking about going to Agile Automotive to get a protune, but they are $500 dollars which seems a little pricey. If i got a protune i would like to have as many modifications that i could afford so that i could try to maximize this turbos efficiency meanwhile potentially building a setup for a bigger turbo. Would you have any other suggestions for modifications of this type (preferably not mods that cost hundreds).

[wrx_02]

^^^ With that said you will want larger injector/intercooler/fuel pump/3 port boost controller. Those are your limiting factors with a larger turbo

[Travis@COBB]

If you do not have a walbro you will need one 100%. That is why your injectors are hitting 100% idc. Honestly, I would increase the size of your injectors along with the fuel pump and then get a tune. I realize that cost is a factor here, but you should be looking at dropping another $1,000 or so to get the car "right" for injectors, pump and a tune. But really, talk to the tuner and see what they recommend. If they say you just need a pump and a tune do that. You can also look into an E-tune if you are trying to save money. However, if you want to go faster, you need to be ready to lay the cash down.

[Charlie]

However, if you want to go faster, you need to be ready to lay the cash down.

"Speed is money, how fast do you want to go??!!"

[wrx_02]

This is why I started getting into motorcycles.

6k on a sportbike and you will **** your pants for months!

[XBelfast]

So i was looking at the map notes for the 2006 and 2007 sti and am wondering what is restricting my wrx from being able to push 19.5psi? is it the fuel pump and injector difference? i was under the impression that 2006 wrx injectors flow around the same as the sti?

The fuel pumps and injectors flow the same for the 2006 and 2007 WRX and STI (see the following thread). http://forums.nasioc.com/forums/show....php?t=1218460
I had an issue with my boost after the VF39 conversion too. I had a ProTune done and he couldn't raise it much further than Cobb's map. He said when he tried to, the ECU just clawed it back on the dyno pull, so the boost seems to be inherently limited by the computer itself. He did get me an extra 30whp and 30wtq (lower down, which was great) and the car is dramatically quicker than with the OTS map. Vendor is Jeff Evans (evanstuning.com) in PA and I couldn't be happier with his work.

[chrisbosssjake]

The fuel pumps and injectors flow the same for the 2006 and 2007 WRX and STI (see the following thread). http://forums.nasioc.com/forums/show....php?t=1218460
I had an issue with my boost after the VF39 conversion too. I had a ProTune done and he couldn't raise it much further than Cobb's map. He said when he tried to, the ECU just clawed it back on the dyno pull, so the boost seems to be inherently limited by the computer itself. He did get me an extra 30whp and 30wtq (lower down, which was great) and the car is dramatically quicker than with the OTS map. Vendor is Jeff Evans (evanstuning.com) in PA and I couldn't be happier with his work.

If everything is set up correctly THE ECU WILL DO WHAT IT IS SET TO DO! Just as long as all parameters are set correctly you can boost until you hit knock/fuel cut. So, with that said you might want to check into a new tuner.

What is holding boost back is most likely the stock boost controller and deffinately the pill! I just did a tune with the pill and a Perrin EBCS. Could not get it to boost over 17.5 PSI. Took out the pill and rerouted the lines to the EBCS and I could boost until I hit fuel cut @ ~25-26 PSI. I have since dialed it back a good amount and boost ~21 psi all day long.

[XBelfast]

I have since dialed it back a good amount and boost ~21 psi all day long.

What about all year long? Or all 5 years..? I'm no mechanic so when Cobb go on in big letters about how important the restrictor pill size is I get scared and believe them. If my tuner had told me to take the pill out to boost higher I'd have lost all confidence in him right there and taken my car home. If you've been running the higher boost for many thousands of miles with no problems then that's a testament to the basic strength of the engine, but you obviously have the skills to fix it if it goes wrong. I don't and this is my only car, so with the restrictor pill in place I stand by my happiness with the ProTune results.

[chrisbosssjake]

What about all year long? Or all 5 years..? I'm no mechanic so when Cobb go on in big letters about how important the restrictor pill size is I get scared and believe them. If my tuner had told me to take the pill out to boost higher I'd have lost all confidence in him right there and taken my car home. If you've been running the higher boost for many thousands of miles with no problems then that's a testament to the basic strength of the engine, but you obviously have the skills to fix it if it goes wrong. I don't and this is my only car, so with the restrictor pill in place I stand by my happiness with the ProTune results.

Whether the tune is going on a daily driver or a track car is not what was previously mentioned. And we are not talking about an OTS map where the pill is a requirement, we are talking about Protuning . You were saying that your tuner was telling you the ECU was holding back boost. I was just simply telling you your tuner might not know very much about the boost system and hence my response "If everything is set up correctly THE ECU WILL DO WHAT IT IS SET TO DO".

If you put on an aftermarket boost controller (3-port) that will handle the unrestricted (no pill) boost you will get higher boost numbers and potentially more power. So again if everything is set up correctly the ECU will do what it is set to do. In your cituation your boost was being held back mechanically not electrically (ECU).