Not getting full map readings? If the manifold is seeing boost, then the MAP sensor is maxed out at 5 volts. No matter what throttle position.
O noes!
Smokey wrote:Not getting full map readings? If the manifold is seeing boost, then the MAP sensor is maxed out at 5 volts. No matter what throttle position.
He should be running a check vavle so the map will never see boost. You TPS, and map readings are just as important.
FU Tuning
John Higgins wrote:Smokey wrote:Not getting full map readings? If the manifold is seeing boost, then the MAP sensor is maxed out at 5 volts. No matter what throttle position.
He should be running a check vavle so the map will never see boost. You TPS, and map readings are just as important.
Thats the point though, the stock MAP can only put out a maximum of 5 volts at 1 bar, no matter what pressure its seeing. You could put 20 psi to the factory map, and it won't read more than 5v...
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I am not following guys, are you trying to say that John is wrong, if so who can give a rational explanation why bothi my car and reaper are doing the same thing on partial throtlle and don't tell me it is a coincidence please. lol
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i was wondering wat is the cc's on a stock 2.4 injectors??? are venom any good???
Are you running a check valve? I don't see why you would want to.
Honestly, it could happen because it's running in closed loop at partial throttle or something to that nature. But when the manifold see any boost, the MAP is reading 5 volts, assuming a one bar MAP is used.
O noes!
Nexgen Cavy wrote:i was wondering wat is the cc's on a stock 2.4 injectors??? are venom any good???
Stay as far away from Venom injectors as you can. Stock 2k+ 2.4L injectors are 19lb/hr
Yeah, Smokey is right, the only place that its really a problem is at partial throttle where the turbo can create atmospheric pressure in the manifold, sometimes even at idle. Your ECU would get signals that you are not on the throttle, but there is no vac in the manifold, so it thinks your map sensor is faulty, throwing a map sensor high voltage code...
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who makes good injectors for 00' 2.4 ???thanxz shifted you actually answer Sh!t and not be a smart A$$ like some ppl!
im assuming ford red tops #30 will fit in 03+ ecotecs also shifted?
I think you'll need new clips, Shifted, the clips for Fords are like the older style ones.
I am pretty sure stock 2.4 injectors are 24 pounds. 20 pound injectors only support 145 at 100 duty cycle.
O noes!
The older 2.4's are definately 24lb/hr, but according to Mark Pain and having RC flow test and balance his 2k+ injectors, they were 19lb hr. Of course they could be using different pressure rates to rate thier injectors (aka GM using 50psi, RC using 43).
Yeah, I forgot about the clips. You'll have to get those off the donor vehicle, I think a lot of the older fords all use the same clips. Just slipped my mind because I bought my injectors with the clips
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I'm running stock 2.4 injectors with roughly 6-7 psi of boost and an 8:1 fmu. My air fuel ratios are between 11.5 to 12.5. Using a plx m-300 wideband in the downpipe.
Of course this is not by any means the best way to do it, but you can still make it work. I should also mention that if I up the boost to about 8 psi, the injectors will start to clip because of all the extra pressure.
I really should take the time to put my brown top t/c injectors in and do some tuning with the SAFC for a decent idle.
Ok, so I lied...this morning, with it being about 28 deg (F) outside, my air fuels were high 12's to almost 13 at 7 psi. Needless to say, I didn't really pound on it. When I was seeing the 11.5 - 12.5 ratios the other day, it was about 50 degrees outside. I'll probably back the boost back down to about 5-6 or add some fuel with the SAFC until I can find time to put in the bigger injectors.
All in all, I don't think 6 psi is completely unachievable with stock injectors, but like I said, it's definitely not the best or most reliable way.
Smokey wrote:Are you running a check valve? I don't see why you would want to.
Honestly, it could happen because it's running in closed loop at partial throttle or something to that nature. But when the manifold see any boost, the MAP is reading 5 volts, assuming a one bar MAP is used.
Ok, maybe I'm wrong about the map sensor, but if he is running a check valve it does not matter what the manifold has in it, be the map sensor will not see that because of the check valve. Why run a check valve? Wells oem people have had bad luck not running them, and others have not. I know on the ecotec when it see's boost the check engine light will flash.
if you are not at full throtte, or WOT you are not getting full benefit of the ECU. The ECU dumps more fuel at WOT, if you are not at WOT the FPR is not puting out as much pressure, so when the FMU increases it is increasefrom a lower FPR pressure then, if the car is at WOT at WOT FPR pressure.
FU Tuning
Check valve?? I don't know why, since the ECU has not once given a code for high manifold pressure or such. lol If there is a code for it.
But it is running good at 7-8 psi and 8:1.
I mean impressive little @!#$.lol
BTW, I blew another injector the other day and got it replaced yesterday, that is 2nd so far.Sucks.
Best time:"""11.946""" @ 114.73 mph @17psi 1.83--60"
11 second daily driver!!!!
Race Related 727-561-9440
Shop of choice for your 11 second J body!
Also, built bottom end and or top end LSJ and L61's available.
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you cant put a check valve on the ecotecs map sensor..its directly on the intake manifold.....
Deekster Jones wrote:you cant put a check valve on the ecotecs map sensor..its directly on the intake manifold.....
I know what you are saying, but we had one on it. This was a speedcraft kit, the first street turbo ecotec.
FU Tuning
Quote:
honestly, you can't boost nicely with a FMU. with the e-manage, you can adjust pulse frequencies and such, giving as much fuel as you want with stock pressure. it is more expensive, but turboing a car isn't cheap. my .02 cents.
not true. i ran w/ an fmu for the longest time and had good luck with it.
Quote:
you cant put a check valve on the ecotecs map sensor..its directly on the intake manifold.....
untrue. i ran a check valve just fine on mine for the entire time i owned it. the check valve itself sits on top of the intake manifold and is easy to put a check valve into.
also.....u are having trouble at partial throtle boost for this reason:
you car stock is na. it is setup to read from the map and tps sensor and adjust fuel according to that. Now throw boost into the mix and you need more fuel for combustion right? Well even with bigger injectors and an fmu the fuel mapping will be piss poor. The computer thinks ur at part throttle even tho ur map sensor is maxed out. it doesnt think u need all the fuel at that time so it limits the injectors.....meanwhile ur EGTs will spike up and u'll run lean.
This is why a stand alone is so important to do it right.
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