| cgroppi | 03-07-2005 11:29 PM |
Fuel pump legal for STU
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Are high capacity fuel pumps legal for use in STU (i.e. Walbro 255LPH)? The 2005 rules don't mention anything about fuel pumps in the ST catagory (just fuel pressure regulators), and no search here turned up anything specific to STX or STU.
| Butt Dyno | 03-08-2005 12:48 AM |
No clue whether it's legal, but if you can't run more boost and bigger injectors, why would you upgrade the fuel pump?
| BAN SUVS | 03-08-2005 01:20 AM |
Not legal, but as BD said, you don't need one in an STU legal STi anyway.
| Snakebot | 03-09-2005 12:18 AM |
As a general rule, if it doesn't say it's legal in the rulebook, it's not legal.
The only legal ST fuel system mods are mechanical fuel pressure regulators OR electronic fuel ratio devices, ie. Apex-i AFC.
The only legal ST fuel system mods are mechanical fuel pressure regulators OR electronic fuel ratio devices, ie. Apex-i AFC.
| Midnight_Gold | 03-09-2005 02:51 AM |
Weeeeelllllllll.........
95% of tuned STi's need new fuel pumps. I'm pretty sure you're allowed to replace them (and I don't believe they have to be OEM parts - but I don't know for sure). Many STi's run at 95+% capacity out of the box... BEFORE you get the car's tuning taken care of.
~ Miranda
95% of tuned STi's need new fuel pumps. I'm pretty sure you're allowed to replace them (and I don't believe they have to be OEM parts - but I don't know for sure). Many STi's run at 95+% capacity out of the box... BEFORE you get the car's tuning taken care of.
~ Miranda
| antimullet | 03-09-2005 07:41 AM |
What they know don't hurt them.
| dwx | 03-09-2005 08:12 AM |
Oops, wrong class.
Anyways, in STU they aren't legal.
Anyways, in STU they aren't legal.
| DrBiggly | 03-09-2005 11:04 AM |
The fuel pump isn't legal in STX, nor is it legal in STU. I had to remove one for just those reasons from my first Subaru last year. :)
| Scooby South | 03-09-2005 11:59 AM |
[QUOTE=Snakebot]As a general rule, if it doesn't say it's legal in the rulebook, it's not legal.
The only legal ST fuel system mods are mechanical fuel pressure regulators OR electronic fuel ratio devices, ie. Apex-i AFC.[/QUOTE]
Ding....WinnA
The only legal ST fuel system mods are mechanical fuel pressure regulators OR electronic fuel ratio devices, ie. Apex-i AFC.[/QUOTE]
Ding....WinnA
| Got Pink? | 03-09-2005 02:42 PM |
Is a reprogrammed ECU and fuel pressure regulator legal or is that part of the or statement like electronic fuel ratio devices?
| afpdl | 03-09-2005 02:48 PM |
If you change the fuel control via ECU than you cant touch the FPR. But there is nothing in the rules that says you cant reflash the ecu for timing and use an FPR for fuel. Basically you are allowed one method of controlling fuel.
| BAN SUVS | 03-09-2005 07:08 PM |
And you can't touch boost control in any way. this is why you don't [i]need[/i] a fuel pump in an ST or SP STi. A properly tuned, non-autocross STi, yes.
| afpdl | 03-09-2005 07:52 PM |
You dont NEED one but you could use one. On my stock ecu my injectors are hitting 110% dutycycle on a delta dash, why it scales past 100% I have no idea but it means the injectors dont have that much more room to go. Its not going to make more power or anything but it would provide you with more of a saftey margin.
| subieworx | 03-10-2005 11:17 AM |
[QUOTE=afpdl]You dont NEED one but you could use one. On my stock ecu my injectors are hitting 110% dutycycle on a delta dash, why it scales past 100% I have no idea but it means the injectors dont have that much more room to go. Its not going to make more power or anything but it would provide you with more of a saftey margin.[/QUOTE]
Isn't it nice to see the injectors giving it their all. :cool:
Isn't it nice to see the injectors giving it their all. :cool:
| Scooby South | 03-10-2005 12:54 PM |
[QUOTE=subieworx]Isn't it nice to see the injectors giving it their all. :cool:[/QUOTE]
ditto... Static isn't good but what do you do...????
Bill
ditto... Static isn't good but what do you do...????
Bill
| trhoppe | 03-10-2005 02:02 PM |
[quote]And you can't touch boost control in any way. this is why you don't need a fuel pump in an ST or SP STi. A properly tuned, non-autocross STi, yes.[/quote] Since when do you not need a fuel pump/injectors when making 350whp ;)
-Tom
-Tom
| AUTOwrXER | 03-10-2005 03:09 PM |
Seriously. I'm doing more than just the fuel pump to support the ESP car. That's with Water injection (probably) and C16 (without a doubt) leaning the car out.
| BAN SUVS | 03-10-2005 07:52 PM |
[QUOTE=trhoppe]Since when do you not need a fuel pump/injectors when making 350whp ;)
-Tom[/QUOTE]
:huh: In STU? 100 extra wheel horsepower without touching the turbo or boost is a neat trick.
-Tom[/QUOTE]
:huh: In STU? 100 extra wheel horsepower without touching the turbo or boost is a neat trick.
| trhoppe | 03-10-2005 10:27 PM |
He said SP ;)
-Tom
-Tom
| BAN SUVS | 03-11-2005 01:51 AM |
You can't touch boost in SP either though.
| trhoppe | 03-11-2005 09:12 AM |
:lol: :lol:
-Tom
-Tom
| AUTOwrXER | 03-11-2005 11:36 AM |
Don't need to ;)
| wm07 | 03-11-2005 01:36 PM |
A catless STi is going to spike to 18 psi or something. :banana:
| AUTOwrXER | 03-11-2005 04:14 PM |
Not quite, but well tuned the car will still outrun the injectors over about 6000 rpm. Situation is worse on pump gas.
| Got Pink? | 03-11-2005 06:29 PM |
So for STU i should be running race gas and since a single high flow cat is required boost will not spike quite as high and hope the injectors hold out. I will be using Cobb street tuner once i get my suspension all setup and need something else to play with.
| AUTOwrXER | 03-13-2005 11:20 PM |
Check the fuel section of the rule book. SP and up = race gas. Stock and ST = pump gas...
| dwx | 03-14-2005 08:57 AM |
You can run 100 octane gas.
| AUTOwrXER | 03-14-2005 10:30 AM |
3.6 A - Stock and Street Touring Class vehicles will use service station pump fuel only. Pump fuel is defined as that which is "Federally approved for use on public highways." This does not allow racing-type fuels which are available at service station pumps.
There are higher octane rated fuels which are federally approved, but I wouldn't consider them "race gas." They are unstable to the point where the extra octane gives little benefit.
There are higher octane rated fuels which are federally approved, but I wouldn't consider them "race gas." They are unstable to the point where the extra octane gives little benefit.
| Got Pink? | 03-14-2005 12:17 PM |
Well at least I can still get Sunoco Ultra 94 in PA and 93 everywhere else on the east coast. It must really suck to have to use the 91 in CA and other areas. Is there significant risk in running the stock injectors at 100%?
| dwx | 03-14-2005 12:39 PM |
100 octane is considered pump gas, and you can get a decent bump in power from running it over 91 or 93/94, especially 91.
| Got Pink? | 03-14-2005 01:18 PM |
Where exactly do I get 100 octane 'pump' gas? Can i run Ultra 94 and mix with toulene or xylene or is that not legal? Most likely i will just run 93/94 locally and only bother with it for divisionals/national tours.
| dwx | 03-14-2005 03:01 PM |
[url]www.racegas.com[/url] has locations of Sunoco GT100 gas. It's not really widely available. Best bet is to find a local place that sells Sunoco or some other brand of leaded race gas, and they can usually get it. You can't put in additives like toluene or xylene.
Anything above 100 you see at a pump is usually leaded and can't be pumped directly into a gas tank. The pump nozzles are oversized so you can't. It has to be pumped into a container.
Anything above 100 you see at a pump is usually leaded and can't be pumped directly into a gas tank. The pump nozzles are oversized so you can't. It has to be pumped into a container.
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