VF52 fueling?

[BAC5.2]

Fine. I'll get a Walbro. Happy? I think I'll get one from Mike, though. That'll cut down on install time for sure. I am absolutely not interested in taking time to mod the bucket myself. Everything is PNP, right?

 

I guess that's a good thing. Then the ground work will be laid for injectors later. I'll probably do ID1000's and an 18G or something like that. Something like 330whp/360ft-lbs would probably be about as far as I'd want to go. It's a street car, afterall.

[rao]

Boost A Pump

 

 

I know, I know, that is only for people who actually want something that works

[BAC5.2]

Should I run 1/2" fuel lines too? I hear you need 1/2" to make any powar.

[rao]

1/2" is on the small side, but in any case you do need a fuel pump that actually works

[BAC5.2]

I actually DO have a FuelLab Prodigy sitting on my desk...

 

Is 200GPH @ 45psi enough?

 

http://fuelab.com/prodigy-fuel-pumps/42402-prodigy-fuel-pump-high-power-efi-in-line

[rao]

45 psi? Are you running a carburetor?

[BAC5.2]

Aren't we supposed to?

[rao]

It does make it easier to tune.

[CTATV]

Aren't we supposed to?

 

I also recommend Klots Super-Techniplate castor bean/syn 2 stroke oil premix for that extra oomph...

[BAC5.2]

Good idea. I was thinking about installing an aftermarket choke, too.

[CTATV]

Good idea. I was thinking about installing an aftermarket choke, too.

 

wiht that kind of power your in muffler bearing territory...

[BAC5.2]

Really? I didn't think I'd have to worry about those.

 

Boy, this kind of thing really snowballs on you, doesn't it? Maybe I should just stick with stock parts and start making shit up about how they are better anyway?

[fahr_side]

Maybe I should just stick with stock parts and start making shit up about how they are better anyway?

 

That only works if you have no data to back up your claims. Without faith the gains are nothing.

[BAC5.2]

This car thing is hard.

 

Someone brought up the idea of a BNR16G in a PM. Anyone have any input on the differences between the VF42 and the 16G? I'm not really interested in the 16G, since I can get a VF52 for almost free. But the person that sent me the message made 276 wheel with gutted cats and a Walbro.

[iNVAR]

So lemme get this straight. With stock fueling, with a VF52, the limiting factor would be my pump?

 

And if I upgrade the pump, the limited actor becomes the injectors?

 

And if I upgrade the injectors, the limiting factor becomes the turbo?

 

Does the same hold true with the BNR16G? Or should I be looking at a BNR18G?

[CTATV]

So lemme get this straight. With stock fueling, with a VF52, the limiting factor would be my pump?

 

And if I upgrade the pump, the limited actor becomes the injectors?

 

And if I upgrade the injectors, the limiting factor becomes the turbo?

 

Far as I know, yes.

 

Does the same hold true with the BNR16G? Or should I be looking at a BNR18G?

 

no idea

[BAC5.2]

A pump with any turbo seems like a pretty good idea. You don't want to run out of fuel because the pump can't keep up. I guess I just assumed that the WRX had the same pump as us.

[iNVAR]

You can run the stock injectors and pump on the VF52. Your tune will need to taper boost on the high end..so some power (not a ton) is left on the table if you do not upgrade pump/injectors.

 

Yeah you'll get near 300whp (290+) on the stock fueling system before it craps out on you.

 

you can push it for another 15-20 with fueling an fmic and complete turbo back.

and another 30-40 on top of that if you go e85

And are these two things true as far as you guys know? If I taper off the boost at the high end, I won't have to upgrade the pump? Or it's one of those things like the stock TMIC where I should probably replace the pump anyway since the new turbo/tune will be pushing it and it might just crap out?

[BAC5.2]

I was thinking the same thing, but in reality I think swapping the fuel pump is just the better solution. It's relatively innexpensive and easy to do.

[CTATV]

And are these two things true as far as you guys know? If I taper off the boost at the high end, I won't have to upgrade the pump? Or it's one of those things like the stock TMIC where I should probably replace the pump anyway since the new turbo/tune will be pushing it and it might just crap out?

 

sure you can de-tune so to speak and run it with stock stuff but then why upgrade the turbo?

[fahr_side]

You can run either the VF-52 or the 16G on the stock fuel system. Either way I'd upgrade the pump as it's just good insurance. On either turbo you will be wringing the pump's neck at the top-end so there are questions as to how long it will last. It's simple risk analysis. Chances of failure are moderate, but cost of the upgrade is low and the cost of failure can be very high.

 

VF-52 typically does a little better on the low-end than the 16G where the 16G holds on a bit longer at the top-end. I saw about 280~290whp on the 16G with stock fuel, gutted DP and stock catback. If there had been a low-cost VF-52 on offer I'd have gone that way. Upgrade your pump, gut the DP or get a cheap aftermarket one and go play.

The 18G on the other hand doesn't really make sense unless you are going to do an injector upgrade as you'd have to taper it up top to about 16G power levels so as not to run out of fuel. With injectors and a proper tune you're well into the territory of early clutch slippage and transmission failure. Think hard about this before making that leap.

 

Of course, the VF-52 is the stock '09~ WRX turbo and we know stock parts are best. Claim that you are a race car driver five times in one thread and you are unbeatable!

 

The other option with the fuel pump is the STi item. Again stock Subaru parts for the best undocumented gains known to science-fiction, and you can pick them up with little use on them for low cost. I got one for $35 and next time the tank is empty it's going in. 100% plug and play. For a VF-52 or 16G and pump gas it will be adequate.

[sumfoo1]

Do 16gs have stronger CRHAs than VF turbos?

[fahr_side]

Do 16gs have stronger CRHAs than VF turbos?

How many threads have you seen that started 'My TD0x is making strange noises'?

 

Not all IHI CHRAs are bad. The BB stuff seems to be fine. Some models have bigger bearing housings than others and seem to go longer. Bigger issue is the lack of rebuild parts. MHI sell spare parts, overhaul kits, replacement bearings. IHI don't.

When I was looking at this upgrade a new VF-52 was in the $1,000 range. There were few used ones and those available were in the $700 range. For $25 more I got the BNR and the only thing I'd have done differently would be to make my own oil line rather than buy the FP item.

[sumfoo1]

those are my thoughts too.. Really i'm kinda stuck between an

FP Green (seems to have everything i want but i heard they break more frequently than the others)

Dom 2.5xtr ( seems to make the same power but with more lag)

20g (seems to be a little less powerful but the same spool as the FP green)

for my next turbo.

 

Honestly i should be building up the VF52 since i'm getting ready to sell one lol.

[BAC5.2]

Fahr - I think that sounds like a good plan. I'll see if I can source the OE STi pump. I'm only going with pump gas, so it should be adequate and it means I don't have to worry about sealing or modding the bucket. Did you get the whole assembly, or just the pump alone? My car, quite literally, spends the majority of its life below 4500rpm and plots from the 52 seem to support the left end of the tach. I don't really need to max it out on the top end, as long as it makes more power than I do now I'll be happy.

 

Have you heard of any reliability problems coming from the 52? I haven't seen many, but I also haven't really looked.

 

Which turbo is lighter? The 52 or the 16G? I don't want my CG to change too much and the turbo sits up pretty high.

 

Will I need a new timing belt?