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> Dangers of Running Rich, 3sgte owners
post Sep 29, 2004 - 11:02 AM
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jgreening

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Well, ten days into ownership of the 3sgte and I can safely confirm what everyone else has said over and over....these engines run very rich. I have read many posts about this and about the fact that Toyota made it this way to avoid lean conditions. However, I would imagine that running an overly rich condition cannot be good for the engine over time either. I am wondering whether for engine longevity and reliability purposes, us 3sgte owners should take action either through an S-AFC or stand alone to lean out the A/F ratio. Obviously, we can see some horsepower gains from doing so but I am particularly interested in responses dealing with engine life.


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QUOTE(lagos @ Jul 10, 2006 - 1:55 PM) [snapback]454118[/snapback]

i know your trying to do the right thing for your motor, but this is one of those times where you should just trust the guys who have had their swaps for a while and have done a ton of research into this.
 
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post Sep 30, 2004 - 10:06 AM
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thedevilmaycrie



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QUOTE (Doge @ Sep 29, 2004 - 6:07 PM)
QUOTE (jgreening @ Sep 29, 2004 - 9:12 AM)
Lagos, I am still running the 5sfe pump.  Jayson claims it will be fine up to 18 p.s.i.  Even with the 5s pump, the mixture is way rich.  Anyway, the pump only supplies what is demanded from the ECU so, in general, the pump shouldn't act to cause rich conditions even if it is way overkill.

Also, there is a very interesting thread over on mr2oc.com that suggests you should never upgrade to a supra pump unless you upgrade the fuel rail.  It was started by Wolfkatz (sp?) and has a lot of testing to back up his claims - although I must admit, I couldn't follow much of the fluids engineering hyper talk.  Also, its quite possible that the conclusions only refer to conditions above the horsepower levels we find ourselves at - so far.

Running the N/A pump is dangerous. You're seriously just playing with fire... our pumps can pump enough fuel for the 3s.. but its RIGHT on the line. Any more power and its going to cause alot of problems. And if your pump is however many years old... its going to decrease in efficiency. I wouldn't risk it JGreening, you should get a pump asap. Here's the proof. Read the whole thing... you'll be glad you did!

N/A Fuel Pump BAD!
Turbo Fuel Pump GOOD!

The walbro fuel pump is $80 and is a piece of cake to install.. its just worth it knowing your engine will get all the fuel it needs.

And that test about the fuel pump that you talked about on mr2oc... that was a test on 550 injectors on the stock fuel rail. Having a upgraded fuel pump will do no harm to our engines... we are pretty much putting in a fuel pump that is pretty close to the alltrac ones that the engine was meant to run with.


also on the fuel pump resistor... all it does is, at idle it kicks downt the amps that is allowed to the pump... making it work less (basically turning it down) at anything above idle it kicks it back up to full power. Fuel pumps are either on full blast or off... there is no in between, unless you have a resistor... which isnt necessary

doge is right i fried my #4 piston from that.... luckly the cylider just ended up needing a little bit of honing i learned my lesson and you dont wanna use a walbo without the use of a high power regulator..... i say use the mr2 stock fuel pump but thats just my opinion from trail and error

Posts in this topic
- jgreening   Dangers of Running Rich   Sep 29, 2004 - 11:02 AM
- - Jdog1385   you should try to lean it out a bit. nothing craz...   Sep 29, 2004 - 11:05 AM
- - lagos   my theory is that the swap runs richer then a norm...   Sep 29, 2004 - 11:07 AM
- - jgreening   Lagos, I am still running the 5sfe pump. Jayson c...   Sep 29, 2004 - 11:12 AM
- - Supersprynt   Keep in mind they have 3sgte fuel pumps that are r...   Sep 29, 2004 - 11:22 AM
- - jgreening   QUOTE Keep in mind they have 3sgte fuel pumps that...   Sep 29, 2004 - 11:25 AM
- - Supersprynt   I figure because they are a different generation. ...   Sep 29, 2004 - 11:27 AM
- - jgreening   Whats a TC? Also, are you going to do any engine ...   Sep 29, 2004 - 11:46 AM
- - Supersprynt   tc - turbocharger, my bad I start shortening thing...   Sep 29, 2004 - 12:12 PM
- - 97sccelica   it fouls o2 sensors sooner(only if very very very ...   Sep 29, 2004 - 12:17 PM
- - Supersprynt   ECU's dont dump more fuel they retard timing. ...   Sep 29, 2004 - 12:22 PM
- - shid   I think the issue about fuel pumps might be someth...   Sep 29, 2004 - 12:38 PM
- - Supersprynt   No, that doesnt make any sense at all, LOL sorry I...   Sep 29, 2004 - 2:17 PM
- - Kwanza26   Running a bit rich doesn't hurt the engine. I...   Sep 29, 2004 - 5:04 PM
- - shid   QUOTE (Supersprynt @ Sep 29, 2004 - 7:17 PM) No, t...   Sep 29, 2004 - 8:34 PM
- - Doge   QUOTE (jgreening @ Sep 29, 2004 - 9:12 AM) Lagos, ...   Sep 29, 2004 - 9:07 PM
- - Doge   QUOTE (lagos @ Sep 29, 2004 - 9:07 AM) my theory i...   Sep 29, 2004 - 9:13 PM
- - jgreening   Thanks for the post Doge. It looks like up to 12p...   Sep 29, 2004 - 9:26 PM
- - Supersprynt   QUOTE (jgreening @ Sep 29, 2004 - 10:26 PM) T...   Sep 30, 2004 - 7:30 AM
- - thedevilmaycrie   QUOTE (Doge @ Sep 29, 2004 - 6:07 PM) QUOTE (jgree...   Sep 30, 2004 - 10:06 AM
- - jgreening   QUOTE How do you figure 180whp at 12psi? The JDM 3...   Sep 30, 2004 - 12:25 PM
- - Supersprynt   I've never heard 221 stock, only 225. Now, 10%...   Sep 30, 2004 - 12:54 PM
- - Doge   QUOTE (thedevilmaycrie @ Sep 30, 2004 - 8:06 AM) Q...   Sep 30, 2004 - 5:56 PM
- - Coomer   QUOTE (Supersprynt @ Sep 30, 2004 - 10:54 AM) I...   Sep 30, 2004 - 6:26 PM
- - Supersprynt   http://www.mr2oc.com/showthread.php?s=&threadid=55...   Oct 4, 2004 - 4:42 PM
- - lagos   so.... if fuel pressure is controled by the inject...   Oct 4, 2004 - 7:21 PM
- - Supersprynt   we do have FPRs, stock FPRs.   Oct 4, 2004 - 11:18 PM
- - jgreening   QUOTE After reading through this <very long...   Oct 5, 2004 - 1:47 PM
- - YellowTwo   QUOTE (97sccelica @ Sep 29, 2004 - 10:17 AM) but o...   Oct 10, 2004 - 12:30 AM
- - Doge   Yeah you have to know what you're doing to get...   Oct 10, 2004 - 3:30 AM
- - YellowTwo   QUOTE (Doge @ Oct 10, 2004 - 1:30 AM) Yeah you hav...   Oct 10, 2004 - 4:15 PM
- - jgreening   I just thought I would share this answer to my ori...   Oct 15, 2004 - 3:17 PM

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