Hello all,

I'm on the back end of my TII streetcar build and have a few things id love advice on. I am looking to make a fun street car with 300whp to 350whp and i want the correct equipment to do so.

I have a small street port 13b single turbo with external wastegate and BOV as well as FMIC. The emissions equipment is removed and i have a racing beat Y pipe exhaust. Engine MGMT is Adaptronic Modular which i am very new to.

I am looking at buying a fuel pump however i do not know if i want to run a FPR. For 350whp is an FPR required? Anyway I've had my eye on the Aeromotive stealth FP witch requires a FPR and was wondering what Fuel Pumps meet my needs and also wouldn't necessarily need an FPR?

 

*aftermarket fpr

all fuel injected systems require an fpr. It's part of how they work. The stock one is fine. You really only need to upgrade if changing your fuel pressure is part of your plan or if you instead to run larger than stock fuel lines.

use whatever fuel pump you want for your set up. For 350hp, any name brand aftermarket performance pump will be more than sufficient

 

Thanks for the correction and the quick response. I was worried tho that the aeromotive stealth 340LPH would burn itself out if it doesn't have an aftermarket FPR, would it not burnitself out?

 

I cant think of a reason why that would be the case. The stock fpr is doing the exact same thing an aftermarket one would. I cant think of a reason why an aftermarket fpr would be NEEDED for an upgraded pump. Are you reading something somewhere that says otherwise?

 

In another thread on the 340 stealth i found somebody had said
"i personally like the Aeromotive A1000 fuel pump, and thats what im running to 500 hp also. Downside to that fuel pump is overheating, so you MUST run a regulator (aeromotive part also) if you are going to drive the car on the street for moderate distances."

but i realized that he is only talking about an external pump that uses a specific regulator.

If what you're saying is true, that 340 stealth should be safe without an aftermarket regulator, and in the future i may run one anyway. thanks for the help tonight on such short notice.

 

When I ran a Walbro 255HP on my TII with fuel pump rewire and stock FPR the regulator could not bypass enough fuel and fuel pressure increased causing more rich running.

This has happened to me again with my FD when I went from Denso Supra pump to Walbro 450 (because 450 fit my Holley Hydramat) with stock FPR.

Which brings me to my other point.
would be good to have some protection against fuel starvation in the FC unbaffled tank. So, Walbro 450 and Hydramat along with an aftermarket FPR is my suggestion.

In my TII once I exceeded the Walbro 255hp flow I went with Bosch '044 in tank. Good pump, but fuel starved exiting corners anything under 1/2 tank because no baffles/foam/Hydramat.

 

Thanks for some more input, so is a Holley hydramat more sophisticated than the regular fuel filter socks that come with fuel pumps. And also Blue TII was that a setup for a track car with more than 350whp? It sounds like a good and safe setup none the less, but I am trying to meet my goals for a weekend street car and I'd likely be willing to upgrade for track in the future.

Thanks

 

Generally anything over 255LPH will overwhelm the OEM FPR. Base fuel pressure will be really high.

Edit I see someone else just mentioned this also..

 

I've been running a Walbro 400 on the stock fpr, fpd and lines with 850/1300 old school stock injector setup for a while now. Other than little rich idle (~12afr) its fine.

 

This is all good stuff, I haven't messed around with too many fuel systems so I'm glad I'm getting good feedback. Looks like I'm gonna likely go with an aeromotive FPR as well. I would be more fine a little rich than lean, however ideally for tuning I would like more control over tuning not less.

if anybody has anything more to add to this they are more than welcome but i hope it pertains to fuel systems in the 350whp range.

 

There are some circumstances mentioned here that I've nere heard of before.... what is the reasoning why a stock fpr would be insufficient to run an aftermarket pump? Is it a diaphragm surface area thing?

 

Yes, the flow of the FPR bypass is not sufficient to keep fuel pressure in check.

With the stock fuel pump resistor in place on my FD it seems to be just when the pump kicks up to 12V (well, full voltage).

On My S4 FC with fuel pump rewire (bigger wire and full voltage through a relay) it was a constant problem.

Of course, if you have programmable ECU the rich fueling due to increased fuel pressure can be tuned out..

Beware if you then upgrage FPR.

 

Air cannot pass through the Holley Hydramat so as long as any part of it is touching fuel it sucks only fuel up.

Check out the cool videos of it.

When there is no fuel touching the Hydramat I experience a hard fuel cut (as opposed to a gradual lean out.)

I routed my fuel return line onto the Hydramat and seem to always have enough fuel for that tip in throttle at corner exit.
If you pooch a corner and can actually WOT out of it instead of tip in throttle IDK if there would be enough fuel.

 

Hey Blue, I might have asked you before, but do you premix with the hydramat? I would love to run one, but have been scared of it filtering the 2stroke oil.

 

definitely looking into the the hydramat, also good question Does the hydramat work with premix

 

I dont premix myself.

There was a thread on here about the Hydeamat and premixing- forget what the final word was :/

 

FWIW my hydramat **** itself after ~4 years running 100-200:1

 

ive been running hydramat for 5 years or so with premix zero issues. they are really a fancy 10u fuel filter that also solves fuel slosh.. replace every 5 years

 

It seems like premix is safe to do and potentially swap the mat a little before the 5 year mark but that's affordable.

did you use a smaller mat to fit In the stock fc fuel tank baffle? I'm now "shopping" for the correct size and fittings that would be an appropriate setup. Again it does not have to get that last ounce of fuel but i dont want to have worry about my less than a quarter full tank.

 

i run aeromotive stealth 340LPH for 5 years. no issue. makes 350whp

 

it was already stated at least a year or more ago from Holley in their info as no problem with 2 cycle type oils. I had submitted the inquiry to them, but probably was not alone in doing that.