free5ty1e wrote:Anything the stock turbo can make?! As in... 20+ psi? (I thought I'd remembered someone running with the wastegate unplugged resulted in like 21, 22psi...) Whoa. um... at what point does the stock turbo start pumping out superheated plasma and becoming counterproductive??
That was me..lol and no, it was going pretty good.
As for the coupler, maybe you've got a different TB on your '91, but the 3" part is entirely too loose to fit on mine. The 2.5" side is just right for the IC outlet, however. The Autozones I went to had no other couplers but the two I listed. Hmm....
You can squeeze it down with a hose clamp.. it will work.
98 Ford Contour V6 24V 5MT
98 Chevy Camaro Z28 LS1 6MT
91 Rio Red SS 5MT Sold
91 Flat Black Wagon L+ 4EAT RIP
91 Pearl White SS 4EAT RIP
The hell you say. Well, I guess I'll give it a try this weekend, when I go back over to my friend's place. A garage makes this kind of work a whole lot easier than trying to do something in an apartment complex parking lot. Took about 10 minutes to install that FCD (one of the only things I'd done here in the lot) and by that time I was ready to jump in the pool.
I'm gonna go find a compressor map for the VF-11, and see how much I want to push it. I think I saw one somewheres in one of those PDFs posted in a sticky...
-Chris
91SS 4EAT stock, 200k mi
91SS 5MT rebuilt engine waiting for a shell
93TW 4EAT, Forester lift, 3" TBE, 11psi, 200k mi
94SS 5MT4.11+rLSD 311k km: RobTune550,TD05-16g @ 18psi,FMIC,3"TBE,Forester lift
Yeah, there's a compressor map at the end of the engine manual that Josh posted that's allegedly for our stock turbo.
The stock turbo easily pushed 20 psi on my car, and I definitely would not want to let it. I do not believe that the stock fuel system can't safely handle it.
91White-T, what kind of instrumentation did you use to determine that your car was running good on superheated plasma?
"Just reading vrg3's convoluted, information-packed posts made me feel better all over again." -- subyluvr2212
vrg3 wrote:91White-T, what kind of instrumentation did you use to determine that your car was running good on superheated plasma?
Butt dyno...lol Seriously though, I've had no problems whatsoever running max boost. I've checked plug #3 pretty often and it doesn't look like its running lean at all...
98 Ford Contour V6 24V 5MT
98 Chevy Camaro Z28 LS1 6MT
91 Rio Red SS 5MT Sold
91 Flat Black Wagon L+ 4EAT RIP
91 Pearl White SS 4EAT RIP
lol... well I've got problems where I didn't expect them. My BOV's piping is so smooth, that no matter how tight I make the hose clamps, anything above 14psi blows it right out of the tubing. The intercooler gets slammed up against the firewall, and a small gap appears between the BOV and its turbo-side coupler. I'm going to take it off and score the metal up on the outside of the BOV piping so the rubber/hose clamp has a good place to grip something. lol... I also zip-tied the wastegate line to my MBC - that blew off about the same time the BOV blew out of its coupler. So I'm running 11-12psi until I can be sure nothings going to slip apart again
Anyway - I'm trying to read that compressor map and its confusing as all hell. How do you read them things? What I want to know from it is, how hard should I realistically push the stock turbo to be within its efficiency range? I don't like the idea of superheated plasma pumping through my intercooler and engine, so I'd like to limit boost to below that threshold.
And vrg.. you seem to think the fuel system has a problem keeping up with the stock turbo's 20psi, is this due to the extreme heat of the air at that boost level with that turbo or just that the injectors shouldn't be able to keep up without going over 80% duty cycle or something? What's the safe limit for our fuel injectors with the stock turbo?
This will all change once I find me a t3 to hybrid with... then I have no idea how to determine what boost levels would be efficient and/or safe, I'd imagine after that point both the T3 map and the VF-11 map would be incorrect...
-Chris
91SS 4EAT stock, 200k mi
91SS 5MT rebuilt engine waiting for a shell
93TW 4EAT, Forester lift, 3" TBE, 11psi, 200k mi
94SS 5MT4.11+rLSD 311k km: RobTune550,TD05-16g @ 18psi,FMIC,3"TBE,Forester lift
Sometimes a little bit of hair spray on a pipe can help keep a hose on it. The Right Way is to have a bead that the clamp can go past, though...
I think that at 20 psi the stock fuel system would be unable to provide enough fuel to properly cool the intake charge, due to both the high pressure and high temperature. Combine that with no means of measuring intake air temperature and you'll get lots of knock and subsequent timing retard.
I don't know that for sure, but I have a hard time believing otherwise.
"Just reading vrg3's convoluted, information-packed posts made me feel better all over again." -- subyluvr2212
vrg3 wrote:Sometimes a little bit of hair spray on a pipe can help keep a hose on it. The Right Way is to have a bead that the clamp can go past, though...
I think that at 20 psi the stock fuel system would be unable to provide enough fuel to properly cool the intake charge, due to both the high pressure and high temperature. Combine that with no means of measuring intake air temperature and you'll get lots of knock and subsequent timing retard.
I don't know that for sure, but I have a hard time believing otherwise.
thought i would revive an old thread.
would water injection help w/this problem?
96 Impreza L sedan
97 legacy outback limited
00 Impreza RS sedan
No, basically all water injection does is acts as another form of intercooler, it will cool the charged air, but will not help the lean condition THAT YOU WILL HAVE if you are running 20 psi. Assuming 280 crank hp at 20 psi (10 hp per pound is usually a conservative estimate, especially since the legacy is not intercooled and if your running 20 psi I hope your intercooled) you would need at least 390 cc/min injectors running at 100% duty cycle to prevent a lean condition. It is not recomended to run above 80% duty cycle to prevent damage to the injectors, so you would need at least 486 cc/min injectors to be safe. You will also need a way to control the larger injectors as your stock ecu will not run them correctly. This is also assuming that the factory fuel pump can flow enough fuel at aprox 57 psi (I could not find numbers of what the factory pump flow is in the manual) which I doubt it can.
~Josh
Putting a EJ22T in a 1800 lb. car => should be fun :-)
