Adj, Fuel Press. Regs. Why aren't they considered a MANDATORY Mod???

Turbostangman · Dec 26, 2001

I'm just wondering.

AFPRs are considered a Mandatory Mod by late Model Mustang, Camaro, Firebird, Grand National, Typhoon, Cyclone owners but yet A LOT of DSM owners REFUSE to take advantage of their ability to allow a smaller inj. take care of their needs when they don't NEED bigger Injectors.

I mean a LOT of guys Spend HUNDREDS on Fuel Pumps, Injectors, AFCs and the like before even CONSIDERING a AFPR. WHY is that???

Is it because of the selection that's out there? Is it that the majority of you don't know why you might need them or why they work? Is it because it isn't listed by "Retailers" as a "Primary" mod?

Come on, let me know!!!

Chris Anderson
AHP Products

ProjectGSX · Dec 26, 2001

Most are either expensive or require modification to the fuel rail - both of which deter buyers.

shabby · Dec 26, 2001

Agreed, most dont want to hack up their fpr and fear that it might leak.
But Mike from spoolinup came to the rescue and developed a bolt on afpr for us 1g's(2g's coming soon) and mine will be here soon. So i think ill wait on my 550 injector upgrade.

Van · Dec 26, 2001

Turbostangman said:
Is it that the majority of you don't know why you might need them or why they work?

I think that's it in a nutshell.

Most newer DSM'rs, it seems, are just now learning that a datalogger is pretty much a mandatory mod to tune correctly...
The symptoms of having too high a base fuel pressure, because of the bigger pump overrunning the stock FPR, can be hard to see.

There is also the mod factor hassle of it mentioned above...

And it seems as though the 2g stock FPR has more problems with being overran. For example with my regular Walbro 255lph and stock 1G FPR, I've never noticed any problems.

Also, most think that an engine compartment mounted FP gauge is fine too, but they can't see the FP when they really need to.

And standard electrical FP gauges can be expensive. Most typically prefer to spend BIG money on other expensive GReddy type gauges and ignore their FP as a major factor. When it could be used as a tuning tool, a diagnostic tool, etc.

But it sounds as though you are referring more to upping the base fuel pressure to squeak some more from the injectors. I haven't personally done this yet, but plan on sticking in a stock 1G N/T FPR very soon, just to see. The 1G turbo 5-speeds suffer from having a low base fuel pressure to begin with. Lower than just about all injectors are tested and rated at.

Most DSM'rs, it seems, end up using an aftermarket AFPR to LOWER their base fuel pressure after installing a pump that is way too big for their needs, because it overruns the stock FPR and makes tuning a biotch. It makes for a non-linear FP curve, especially in the low boost area of the curve... So FPR's like the B&M Command-Flo are cheap and basically useless junk.

terminaltsi · Dec 26, 2001

yeah i wish some of these companies would make a bolt on FPR like they do for honduhs. i would have bought one long ago, but ofor th fact that i don't want ot hack it up...i want it done right, bolt on like on a 127 HP civic.

Rodman · Dec 26, 2001

Ther is a nice bolt on AFPR, Shabby hit the nail on the head with spoolins AFPR. This is a nice peace so I am told.

terminaltsi · Dec 27, 2001

well i want one. is there a website?

Rodman · Dec 27, 2001

Keep it in your pants dude, they don't make one for your 2G yet (he,he) but they say that one is on its way. You have to get on a list first. I don't know if ther's a web site or not. I emailed him, but can't think of the address off hand. Hang in there.

terminaltsi · Dec 27, 2001

I have a 1G! look closely.

greenstreak · Dec 27, 2001

www.spoolinup.com

Rodman · Dec 27, 2001

termin, sorry man It looked like a 2G from the front, were did you get the front bumper from? It looks like you could put a monster of a FMIC on that thing!

terminaltsi · Dec 28, 2001

? It looks like you could put a monster of a FMIC on that thing!

that's the plan! spring time! it's from streetweapon.

91eclipsegsx16boy · Dec 28, 2001

raising the fuel pressure to make your injectors work like bigger ones will kill gas mileage sans afc won't it?

also, doesnt the stock one a rising rate anyway - so more boost will get the proper fuel and if you upgrade pump and dont OVERRUN stock fpr, why bother?...

-aaron

4G63Rydah · Dec 28, 2001

For the guys that are praising the Spoolinup AFPR and recommending it to people, are you actually running them on your cars? As far as I've heard he hasn't even shipped out more than a handful yet (if that much). Simple moral is, don't recommend a product that doesn't even exist yet.

Now, to answer the question of the thread, the "Bling-bling, look-at-me-I'm-cool, give-me-the-most-expensive-part-because-it-makes-me-look-fast, I-have-no-idea-what-I'm-doing-on-cars" crowd are the only people that don't consider it a mandatory mod. The people that know a decent amount about DSM and are running respectable times are pretty much all equipped with AFPRs.

These same people are also the ones that are running big turbos and pushing close to (if not exactly) 30psi at the track. Running boost that high doesn't really allow you to bump up the fuel pressure all that much to make up for small injectors. Above 90psi the injector spray pattern goes to shit, and in the high 80s is where it starts to get unreliable. This means in order for your injectors to work fine with 30psi of boost you really shouldn't be going too far up with the base fuel pressure (~50psi max).

Also remember that the stock pump doesn't flow all that much at high pressure levels, so no matter what you'll need a bigger pump.

Nick 92 TSi AWD · Dec 28, 2001

But then there's people with 16gs that just run mid 12s and are fine with a 190lph pump

darkstarGSX · Dec 28, 2001

from what I have been told even if you use it then the ecu will adjust and put it back. A fail safe. Now I don't know if this is completely true since it came from a not so reliable source (if it aint buschur or RRE then who is?!?! LOL) But I think they told me from their experiences. by the way this was on a turbo RS from hahn.

We all know it is used time and time again but for the most part if it doesnt work for us then we arent going to use it

Adj, Fuel Press. Regs. Why aren't they considered a MANDATORY Mod???

Turbostangman

ProjectGSX

shabby

Van

terminaltsi

Rodman

terminaltsi

Rodman

terminaltsi

greenstreak

Rodman

terminaltsi

91eclipsegsx16boy

4G63Rydah

Nick 92 TSi AWD

darkstarGSX

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