I have a slight stumble at full throttle what do you think is up- I do have a leaking injector but ran good before I boosted it but I plan to fix anyway dont worry just need some opinions thanks
well being that the corsica is definitly not a popular platform to modifiy and it does have all the same engine and drivetrain parts as a cavalier etc.. this is the only place I can go for help
I am sure I need more fuel but I am at a stand still not enough money for all these fancy fuel upgrades Im not trying to make a race car just want my car to run right. Is there injectors that can be put in the 2.2 ohv that can create the proper AF mixture with t3/t4 7psi. I need to make the mixture richer and for pretty cheap.
Cody@RD Fabs wrote:Corsica forums?
As a driver of a Beretta I hate comments like that. Obviously if there were people on the Corsica/Beretta forums that could assist us we wouldn't be on JBody. People like him and myself don't come here for mindless(and I do mean mindless) comments like this. Hopefully this MEMBER can find an answer to his question as I too seek the same advice. Without having to weave through ass clown comments.
Excuse me..end rant. been wanting to get that out for the past couple years.
Today we plan for the future, tomorrow we make history.
Cody Thompson wrote:I am sure I need more fuel but I am at a stand still not enough money for all these fancy fuel upgrades Im not trying to make a race car just want my car to run right. Is there injectors that can be put in the 2.2 ohv that can create the proper AF mixture with t3/t4 7psi. I need to make the mixture richer and for pretty cheap.
I'm not saying this to be an ass at all, just to inform you. There is no way to do it cheap really. Since you decided to go turbo, you made the decision to spend money....and the fuel system is one thing you HAVE to look at.
To do it right and not be concerned with blowing your motor you need an accurate way to monitor your a/f ratios....meaning a wideband o2 sensor such as
this one .
Next you will need a way to get more fuel in there, you can try a fmu, but your injectors can only run a certain duty cycle before they'll just end up puking or dying all out.
If you are being cost conscience, get the wideband first and then an adjustable fpr that WILL raise 1:1 with boost such as
this one. You can up your base FP with an AFPR by simply taking the vacuum hose off the regulator at idle and adjust from there. I would up the base pressure about 5 psi at first, then with your wideband hooked up, take it out for a spin and see where your a/f ratio is at. If you start to get anything above 12.5 at WOT, get out of it immediately and bump up that base pressure some more. Ideal a/f @ WOT with a turbo motor is 11-12.
You have to be careful like I mentioned though, you don't want to overdue the injectors. Another thing is, by upping your base fuel pressure you will notice a loss in fuel economy and a lack of part throttle power. This is due to the excess amount of fuel being dumped in at anything other than WOT.
If after upping the pressure and you're still not getting a good WOT a/f ratio, then upgrade the fuel pump. Finally, if you still can't get it after upgrading the pump you will need to run larger injectors and then to run larger injectors you will need a reflash of the ECM or a piggyback system of some sort. I think there are a few threads around here about which injectors to get out of certain vehicles in the junkyards. I believe one option is the Ford 2.3 turbo 35# "brown top" injectors. I am not too familiar with the GM motors at this point so I don't know if they'll fit the fuel rail or be the right impedance, but a search should yield the answers.
The fuel system is honestly the most critical part to any turbo system and should not be half-assed by any means....it's absolutely vital to the motors survival.
Hope this helps!
i have always thought ideal A/F was between 10-11... but that could just be an SRT-4 thing. and as far as the fuel pump goes i would go with a walbro 255lph... i have the MSD pump and i can't stand it, i have it mounted as low as i can and when i get low on gas i get ALOT of fuel cut. and by low on gas i mean below HALF a tank. if i get to a quarter tank my car barely runs.
Veritas Aequitas
peteyparker311 wrote:i have always thought ideal A/F was between 10-11... but that could just be an SRT-4 thing. and as far as the fuel pump goes i would go with a walbro 255lph... i have the MSD pump and i can't stand it, i have it mounted as low as i can and when i get low on gas i get ALOT of fuel cut. and by low on gas i mean below HALF a tank. if i get to a quarter tank my car barely runs.
10's is really too fat. If you read up on turbocharging most of the books suggest 11-12. A great book to read up on is called "Street Turbocharging" by Corky Bell. You should be able to find it at your local Barnes and Nobles.
The SRT guys are probably saying 10-11 as a bit of an overkill to be on the safe side, but there really isn't anything to gain by running that fat. Theoretically, the leaner you can run without the risk of detonation the more power you are going to generate. Now like you stated though, it might be more a SRT thing.
All in all though, 11 is the best A/F to shoot for.
good to know, thanks for the info. and i have heard that when you have a turbocharged engine leaner is sometimes better. but im rather scared of detonating my car right now so ill keep her just a touch on the rich side...
Veritas Aequitas
So if I get the AFPR and the wideband O2 and dont dog the piss out of it i'll probably be okay right? Can the O2 sensor be hooked up to the computer also so that the SES(service engine soon) light goes out? My corsica is a 1994 model so it has OBD-I.
I dont think I can reflash the ECM so injectors are out of the question for me I guess.
On another note I realized that before my car warms up and before the SES light comes on My car seems to run like a dream, only when it goes to open loop looking for the O2 sensor does it seem to run bad at wot.
thanks for the advise, I just wanted to know the basics if there are anymore things you can think of please holla.
Well if your car doesn't have an O2 sensor it really doesnt know how to run. Every little sensor in the car is there for a reason and each one tells the computer how to react to the environment its in. The O2 sensor tells the engine fuel mixture and oxygen levels, so if it can't read that then your car is not going to know how to run.
Learned that one from experience and a good teachin from the old man.
Veritas Aequitas
