Ive been thinking about it again. I got the turbo bug. I want to run a turbo, but cant afford a kit. I can get a t3/t4 turbo and exhaust manifold for about 500 bucks. Could I just not run the turbo right off of the manifold, make a custom downpipe, run the piping to my intake and put an intake on the compressor side and it would work right? I mean it wont work at its full potential, but running only 5lbs of boost can't hurt anything right?
What im asking is, can i run the stock electronics and fuel system and use the turbo also? I'm going to run low boost and hardly ever see about 3k rpm.
I can get a t3/t4 turbo and exhaust manifold for about 500 bucks.
I hope its not from ebay.
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Could I just not run the turbo right off of the manifold, make a custom downpipe, run the piping to my intake and put an intake on the compressor side and it would work right?
without an intercooler you cant run high boost, but yeah it would work.
5psi.. gimme a break
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What im asking is, can i run the stock electronics and fuel system and use the turbo also? I'm going to run low boost and hardly ever see about 3k rpm.
Hmm. theoretically yes, you can, however your ECU wont realize positive intake manifold pressure, so you're gonna have to deal with that. Fuel system might be tad bit too small. I can also guarantee that you're not gonna drive below 3k with a turbocharger.
You're gonna boost it till the car dies
it runs at half the voltage, so I need 2x as large injectors to run at the stock fuel delivery. Also, it will support almost 13lbs of boost, more than enough to me, and the engines computer wont read overboost correct?
So how about this,
exhaust manifold
Turbo
downpipe
intercooler
int piping
intake tubing
2bar map sensor
~400cc injectors
am i getting close Flash? Theoretically it should work. Is this close to your setup?
Your ECU wont read positive pressure, so putting a 2 bar map wont work.
Yes it will, both map sensors (2bar and 1bar) have outputs from 0v to 5v
So it will read the map sensor no problem.
Will it run well, no probably not.
Will it run far to much advance, yes, yes it will.
A guy here in NZ turbo'd a 5afe with stock ECU and internals.
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Originally Posted by jeremiahnz
Here is a rough explaination
Standard setup is 1 bar map sensor and approx 175cc injectors:
At full vacuum (kind of 0 psi) the 1 bar map sensor sends 5 volt signal to the 175cc injectors to tell them to operate at full cycle. This will fuel it up appropriately for running N/A
New setup is 2 bar map sensor and approx 320cc injectors:
At full vacuum (kind of 0 psi) the 2 bar map sensor sends approx a 2.5Volt signal to 320cc injectors which sends approx the same fuel as the standard above.
At 14.7psi boost (although it won't boost this high on std internals) the 2 bar map sensor sends a 5 volt signal which tells the 320cc injectors to operate at full cycle.
So now you can fuel up appropriately for boost. Also needed is a fuel pump to support the fueling requirements and a FPR that can regulate appropriately. The ecu should also adjust fueling to some degree based on sensor feedback.
One thing this doesn't take care of is timing so the options are a boost timing retarding device or to mechanically retard the timing.
His car has been on a dyno, and the AFR's are fine, not the best but safe.
And I believe power was around 95kw at the wheels.
Its not the best option but it is an option.
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The ECM will see boost with a 2 bar map, but none of the table will be calibrated properly. The map sensor measures load, the main transmision, fueling & timing controls are all based on load. Basically the most of ECM tables would need to be completely redone for it to work right.
Twice the injector won't work, I guarentee it won't even idle with that.
The ECM will see boost with a 2 bar map, but none of the table will be calibrated properly. The map sensor measures load, the main transmision, fueling & timing controls are all based on load. Basically the most of ECM tables would need to be completely redone for it to work right.
Twice the injector won't work, I guarentee it won't even idle with that.
Then you better get in touch with this guy and tell him the car he drives everyday without a problem, infact runs like shit and doesn't idle.
The reason I say it won't "see" the boost is because of the different voltage output of the 2bar sensor. As far as the ECU can tell the manifold pressure never goes positive.
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Yeah, but using a 2 bar map to "cheat" the ecu to produce fuel will give a very lean mixture, because you're referring it to a table that is meant for naturally aspirated operation. Ok, so you replace the stock injectors with bigger injectors. You can get them to squirt fuel using the NA table, but however your idle will not be correct as during idle you're spraying according to the stock injectors, where as the bigger injectors will over richen the mixture.
Problem is really, you're risking alot if you take dumb shortcuts, do it right the first time, because if you fuck up your engine, because your fueling is shit, its gonna cost alot more.
(sorry if i burst any bubbles but..)I think you need to save your money & grasp the fact that your not ready to turbo your car yet lol once you do the resaearch & find what you need to accomplish your goals then go for it.
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"Straight Roads are for Fast cars... Curvy Roads are for Fast drivers "
completed 2004 huh... most stories i hear only last a few months... why dont you invest in a piggyback system ?
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"Straight Roads are for Fast cars... Curvy Roads are for Fast drivers "
If it doesn't work then how come it works fine for this guy?
Got any proof to backup your claim? Ever tried it? Or are you just making stuff up?
If it works, it works more from blind luck. Asuming that is all he did, I would have never guess it would work. It definately would be far from ideal. I would rather use an FMU, and those are a bandaid.
I have never fooled around with that ECM, but I am basing my expereince learning and fooling around with ecm's since the late 90's. Know what the fueling table looks like and where a 1 bar vs 2 bar map would put the fueling, I don't see how it would work with twice the injeector. In theory it should super rich, however Injectors sometime aren't very linear, so maybe that is help out. As I said before, more blind luck.
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