FP turbo decision

[spectr019]

Hey what's going on guys. I've been going back and forth between turbo upgrades for months and a little while ago I decided for the FP Big28 turbo. I'll be ordering the turbo in probably about two or three months, but I just want to be completely made up on the decisions for when I order it.

My main questions are whether or not to have the turbine housing ported. The turbo will be bolted up to an unported Evo III manifold (which I'm ordering tomorrow when I get my paycheck). I'll also be having an Evo III O2 housing (which will be arriving at my house tomorrow), so there will be a pretty constant airflow.
My other question is what effect does having the compressor housing polished do?
My main worry is boost creep, so if I leave the turbo unported and unpolished, will I have much/any creep?

So basically, should I have these done? I understand that technicaly they will give you more airflow, but I'm not going to be upgrading the fuel anymore than the rewired 190 pump and the other basic supportive mods, so definetely without the upgraded fuel components I won't get the full potential out of the ported and polished turbo anyway. So whaddya think?

 

[DSMDirkah]

I say do it now because you will prally want to do it later anyways so why tear it all back apart? Why didn't you just get the walboro 255lph pump to start with if you were going for performance? It costs the same. It doesnt matter how big of a turbo you have as long as you know the limits of your fuel system, so keep the boost low and monitor your engine with a wideband or atleast SOME sort of A/f ratio gauge. Get an adjustable fuel pressure regulator. Alot of people see making horse power like this "OoOooo I get this turbo and it makes alot of power!! Sweet!!!" Rather than looking at the whole picture of supporting mods that will safely harness that power. If you are going to do it just wait until you have your fuel system perfect or you are going to be ticking time bomb.. Just my $0.02

Matt

 

[DGajre777]

If you don't plan to go bigger than the FP Big T28 just stick with the 190 pump. Yes the 255 is the same price as the 190 but then you have to spend more money on an AFPR. The 190 will supply more than enough fuel for the Big T28. With the 190 pump and 550cc injectors you have NO REASON to spend money on an AFPR. Then all you'll need is an AFC and you are done with fuel mods. With all the mods in your profile, I think it is pointless to go that far and not get injectors and a fuel computer. You can find both of them cheaper in the Classifieds.

A narrow band A/F ratio is useless for tuning. Get an EGT gauge and if you have the money get a wideband o2. You'll need a logger for tuning too.

The FP Big T28 has a 7cm turbine housing. The Evo 3 exhaust manifold also has a 7cm opening. If you get the turbo ported have FP port the manifold to match the turbo. The evo o2 housing has a different angle when you hook it up to 2g downpipes. You can go around this by buying downpipes made for the evo o2 housing that is sold by RRE (www.roadraceengineering.com) or by buying bigger o2 housings with the 2G angles (kinda late for you since you ordered everything already).

The polished compressor housing is to make it look nice, it is not for performance increase. You might want to look into the 17psi wastegate actuator that FP sells for $99 too. It helps keep the wastegate closed at higher boost levels.

Boost creep trouble is mostly on the EVO III 16G turbos where you have to port the wastegate passage and the o2 housing. But since you have a 3" turbo back exhaust, I say get the turbo and both exhaust and o2 manifolds ported.

 

[DSMDirkah]

Yeah your pump will run it fine but I like the idea that for an extra $56 I have a fuel setup that can handle up to 500hp rather than go back and spend another $160 to buy parts you SHOULD have got in the first place. But, thats just me, you might like to work on your car alot . I agree that you should never tune on a narrow band but for something cheap they can give you some quick "OH SHIT I AM GOING TO BLOW UP!" information for a very rough tune.

 

[spectr019]

yeah I won't have time to do it right away but I definetely would be fine for putting in an AFC II and the injectors, that'll be no problem. I didn't mention it earler, but on my turbo timer (a'pex) it has a built in a/f ratio. It's obviously not as precise as a wide-band, but it'll give me a rough estimate as to whether I'm going to blow up very soon or not for awhile at least.

 

[DGajre777]

Yeah your pump will run it fine but I like the idea that for an extra $56 I have a fuel setup that can handle up to 500hp rather than go back and spend another $160 to buy parts you SHOULD have got in the first place. But, thats just me, you might like to work on your car alot . I agree that you should never tune on a narrow band but for something cheap they can give you some quick "OH SHIT I AM GOING TO BLOW UP!" information for a very rough tune.

Why get a fuel pump to handle 500HP when the FP Big T28 is good for 350HP?What AFPR is $56 that turns down fuel pressure? There are people on here running 22 psi on 50 trim turbos with the 190 fuel pump. The key to not "blowing up" is tuning. Dumping a big fuel pump and having fuel over run is not going to prevent blowing an engine up.

 

[spectr019]

haha yeeeah don't worry, I'm sticking with the re-wired 190 for sure. I don't even want to get the car powerful enough to need the 255, this is my daily driver that I would like to keep for a few years before I wear it out. I'm not too sure if I want to go through the hassle and danger of the AFC (I'm not too in depth with the manual fuel tuning unless it's like playstation, press the X button and see how the a/f measures up after) so I'll eventually go with the MAF setup if it starts looking like I need to.

But okay thank you guys, my question has successfully been answered about the porting and the polishing. Thanks again for your input.

 

[DGajre777]

haha yeeeah don't worry, I'm sticking with the re-wired 190 for sure. I don't even want to get the car powerful enough to need the 255, this is my daily driver that I would like to keep for a few years before I wear it out. I'm not too sure if I want to go through the hassle and danger of the AFC (I'm not too in depth with the manual fuel tuning unless it's like playstation, press the X button and see how the a/f measures up after) so I'll eventually go with the MAF setup if it starts looking like I need to.

But okay thank you guys, my question has successfully been answered about the porting and the polishing. Thanks again for your input.

About the MAF/MAFT combo. It seems to work fine with 550cc injectors (which will work fine for your setup), but not with 660+cc. With the MAF and MAFT setup you can vent your BOV and have less restriction before the turbo. You'll need to upgrade your intercooler too when you get all your fuel mods so you don't heat soak your stock SMIC, www.extremeintercoolers.com sells a 7" kit which has a curved pipe to fit the T25 and T28. See pic below.