RE: Turbo Help!!!
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RE: Turbo Help!!! - 3/12/2006 12:00:20 AM
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mbo1985
Posts: 778
Joined: 12/11/2005
From: Florida
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yeah, my friend has a SFAC 2 he'll give me for cheap, maybe I'll tune things down with that...
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RE: Turbo Help!!! - 3/12/2006 3:23:33 PM
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lightshow
Posts: 1775
Joined: 1/6/2006
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the injectors are still controlled by the computor..........they wont run at full when the car is idling. the o2 will still monitor how rich or lean the mixture is, if the mixture is too rich, the computor will reduce the pulse width to the injector. when the boost rolls on, the computer will increase the pulse width, and this combined with the rising rate fuel pressure will make the A/f correct under boost. marbro.....with your car right now with the stock injectors, they dont run at full when your at idle. as you hit the gas, the computer realizes that if it doesnt do something, the engine will start to run very lean. so it fattens the pulse to increase the delivery of fuel, when you take your foot off the gas the pulse is reduced or the motor would run rich.
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RE: Turbo Help!!! - 3/12/2006 4:46:25 PM
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marbro
Posts: 1478
Joined: 1/16/2006
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In order to control the flow of fuel of the larger injectors, you'll need some form of a fuel management system. The factory system simply cannot control the changes that are going to be made beyond the factory specs. Thats why people redo the ecu of earlier obd's. Cause if you could just upgrade everything and not worry about the computer no one would change or chip them. Thats why stand alone fuel management exists and if mbo is going to take the turbo up higher then 10psi hes going to have to change the injectors again to 550cc or higher and heaven forbid he would goto over 25psi, running a second fuel line and pump sucks. ^_^ But yeah, the computer only accounts for so much
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RE: Turbo Help!!! - 3/12/2006 6:39:33 PM
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lightshow
Posts: 1775
Joined: 1/6/2006
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well i was just talking about 10 right now. if he goes over that i would recommend him closing the deck. no need to add things that arnt needed right now. the 450's will work perfectly with his stock ecu. the computer doesnt have a set parameter. it takes signals from different sensors and makes its own set of outputs. even right now, the pulse width is wayyyy larger now with the turbo than when he had it stock. that is way out of the normal parameters of the stock engine, but it is working great right now because the computer knows what it needs to do to keep the a/f correct. with the correct size injectors, the computer will actually feel more at home because the signals will actually be closer to what they were stock. lets just put a number on it lets say the pulse is 2 milliseconds stock, and now under boost with the stock injectors, it had to be increased to 4. well with the correct sized injectors it will probably be closer to 2 again. but you are absolutely right, if he does go over 10, then he will need a bunch of heavy duty engine management systems to keep the engine running well, and possibly even water injection. im just trying to help him out a little step by step. he has a hondata, which in sure that hell use later on down the line. i dont want mbo to think that anything else has to be done to run larger injectors because thats already a pretty big step. mbo all you need is
those wiring connectors, because you stock ones dont fit. you can use DSM ones like were in that link earlier or you can by them from RC.
fuel rail. a new aem one or one from RC is perfect....also a dsm rail will fit perfectly too
and then the injectors.
this setup will support 10psi, and you car will run better. for me though, 10 psi would be plenty. shit if im taking on z28's and shit, thats just impressive. mbo if you go to the strip they might tell you that you can even come back until you have a roll cage and kill switches for all kinds of stuff cause i think at like 13.99 or 12.99 they require a cage here in az.
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RE: Turbo Help!!! - 3/12/2006 9:45:41 PM
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mbo1985
Posts: 778
Joined: 12/11/2005
From: Florida
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So if I need new connectors, I'll probably go for the DSMs. 10 psi will be plenty of pop for me for a long time.
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RE: Turbo Help!!! - 3/13/2006 11:52:34 AM
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sir_nasty
Posts: 6303
Joined: 2/23/2006
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How do you estimate HP output based on boost? Any ideas what you may be running at now? I noticed an earlier post that suggested like 225 is that correct??
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RE: Turbo Help!!! - 3/13/2006 1:47:20 PM
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lightshow
Posts: 1775
Joined: 1/6/2006
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great question....and its rediculously simple. its based on atmospheric pressure. there is natually 14.7 psi of pressure on everything on the planet at all times, including the combustion chamber of your motor. so its directly related to the hp of your motor in stock form. so if you add any boost just add it to the 14.7 already in the system. so if you have a 8psi turbo system the new number you will use for the equation will be 22.7 ....so if your motor has 140 hp stock
(14.7/ 140) = (22.7/ X)
so 140 * 22.7 = 3178
3178/14.7 = 216.19 hp
now this is an estimate, true hp can only be told on the dyno, but even then almost every dyno will show a little different number. and if you retard the timing with the MSD it will lower hp, but increase gas mileage
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RE: Turbo Help!!! - 3/13/2006 2:14:35 PM
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sir_nasty
Posts: 6303
Joined: 2/23/2006
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Thanks for the response that's exactly what I wanted to know.... Now, that being said. Do you by chance (or anyone for that matter) know approximate weight/HP ratios and 1/4 mile times or 0-60 times? Basically how much HP would I need to drop to say a 12 second 1/4 mile for my car's weight... I know there are a TON of other factors in this but are there any estimates or general rules?
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RE: Turbo Help!!! - 3/13/2006 3:36:56 PM
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lightshow
Posts: 1775
Joined: 1/6/2006
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you know i cant remember, it is in one of my hod rod magazines though. if i happen to be taking a shit, and see it again, i will definately post it though.
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RE: Turbo Help!!! - 3/13/2006 7:44:54 PM
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marbro
Posts: 1478
Joined: 1/16/2006
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ok youre going to need over 500 whp to hit the 12's most likely 600whp. Theres a 2 door accord with 689 whp and it only got 10.86@136.3mph in the 1/4. So yeah, a lot of engine work and a big turbo.
lightshow, is that equation in consideration of crank or wheel?
Either way i cant run the setup i want on my stock trany lol and this is less then 2000 dollars for the setup....
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