hey guys - im currently in the "ordering parts" stage of putting a turbo on my 97 z24, ive ordered a manifold and a t3/t4 internally gated turbo and i have a couple questions regarding fuel management. Now at first I am only going to run 5psi but would like to bring them up eventually. Would just putting in better injectors do the trick or am I going to have to do fuel pump and fmu, and if so what should I be looking for in injectors fuel pumps and a fmu?
Thanks alot fo all your help
Well injectors are just part of it. The Injectors are what actually feed the motor the fuel, it would help to get a fuel pump to keep a steady flow of fuel and not to burn out your stock fuel pump. Now, with that said, you need something to control how much fuel you are spraying per boost...meaning when you are in X PSI, you should be in a certain A/F ratio...the FMU will help with that.
If you plan on tuning it yourself, a wideband if necessary, that will tell you your a/f ratio to the "T" and from that you will be able to tune with your FMU.
A side note, are you sure that your T3/T4 is internally wastegated? Did it come like that brand new or was it modified to be internally wastegated? The reason I'm asking is because I could have sworn that T3/T4s did not come that way. Also, what brand is it?
If you need more help, just ask.
www.kronosperformance.com / 732-742-8837
thank you so much - I am not rely sure how a fuel management unit works. Is it just "plug and play" easy install and im done and if i buy one that is a set ratio (5:1 for example) will it just let my engine run rich if that is too much pressure? I guess what i am asking is it possible to go too big.
As for the turbo - it is by a brand i never heard of before so now you have me all nervous - "xs power" it is "new in box" and by the pictures and the reviews it seems to be the real deal. I know its probably not the best turbo but hopefully it will work for my low boost needs?
chris abtosway wrote:thank you so much - I am not rely sure how a fuel management unit works. Is it just "plug and play" easy install and im done and if i buy one that is a set ratio (5:1 for example) will it just let my engine run rich if that is too much pressure? I guess what i am asking is it possible to go too big.
As for the turbo - it is by a brand i never heard of before so now you have me all nervous - "xs power" it is "new in box" and by the pictures and the reviews it seems to be the real deal. I know its probably not the best turbo but hopefully it will work for my low boost needs?
It's no problem.
Well, I couldn't give you an off the top of my head answer on the FMU cause I haven't personally dealt with one and it's installation. I found this info that can be helpful:
Vortech Tech Talk wrote:What is an FMU?
The letters FMU stand for "Fuel Management Unit". Basically, an FMU is a fuel pressure regulator. The FMU is used on fuel injected, supercharged engines using the factory electronic engine management system.
When an engine is supercharged the air delivered to it is greatly increased. For the engine to run properly and make max power a 11.5:1 air/fuel ratio must be maintained. Since the factory electronic controller can compensate for this increased air flow (it was not designed for supercharger use) another way has to be found to supply the necessary additional fuel. The FMU is the device that does this.
The FMU is installed just down stream of the stock fuel pressure regulator. It does not control fuel pressure until the engine manifold pressure comes under boost from the supercharger. As the manifold pressure increases, a pressure line from the manifold to the FMU causes the FMU to increase the fuel injector rail pressure. The increased fuel pressure causes the injectors to deliver more fuel to the engine. With this system the stock factory electronic controller can be used without modification on a supercharged engine with good results. The reason the Vortech supercharging systems are smog legal is because the stock controller is retained unmodified and at part throttle the engine's performance and emissions are not effected.
Basically, just replace the parts where it says supercharger with turbo lol
Now, as far as the XS Power turbo...how can I say this...
DON'T BUY IT!
They are EXTREMELY known to just go to crap, fall apart and just made of crap quality. With that said, either read the descriptions on ebay again because they are not internally wastegated. I highly suggest ONLY getting a Garrett Turbo if you want a T3/T4 turbo. This will say you time and headaches down the line. Last thing you want to do is hook up your turbo kit take it for a run and 2 miles later it just goes to s**t.
Read this thread for more reasons why you shouldn't buy their turbos:
http://www.j-body.org/forums/read.php?f=40&i=67204&t=67204#67204
If you want a licensed place that sells a real Garrett Turbo, let me know. Trust me, spend the extra money for a Quality working turbo.
Anymore questions, just ask.
www.kronosperformance.com / 732-742-8837
installing a FPR (fuel pressure riser) is super easy. it takes about 15 minutes to put in, but a couple dyno runs to tune.
It goes into the return fuel line after your factory regulator. you can buy adjustacle ones (ei. BEGI car tech) or a set (12:1, 8:1 Vortech) I would recommend the fully adjustable.
installation pretty much includes cutting you return line and attaching the two hose ends to the FPR, If you are going with larger injectors you will need to turn down your idle fuel pressure with the FMU (areomotive) ask stevefire how those work. From what I understand if you up injector size 20% you will have to lower your idle FP 20% to use the same amount of fuel, but at 5 psi (I know psi means nothing) factory injectors should be good with just a FPR, IMO
HP Tuners | Garrett T3/T04B | 2.5" Charge Pipes | 2.5" Downpipe | 650 Injectors | HO Manifold | Addco front/rear | Motor Mounts | HKS SSQV | Spec stage 3 | AEM UEGO Wideband | Team Green LSD | FMIC | 2.3 cams | 2.3 oil pump swap | 280WHP | Now ECOTECED
An FMU will help you in boost and you can purchase an adjustable FMU to suit your needs. In this case you still have to watch out for the "how big is too big" phrase because if you opt for a non-adjustable FMU like a Vortech 12:1 FMU, you're stuck with the 12:1 setting. Depending on the motor, pressure, and everything else it could cause you to either run very lean or very rich. I'm pretty sure you can change the discs to something other than 12:1, but that means you will have to purchase them. If I were you, I'd look into an adjustable FMU like Cartech (model number CAR-2025). You can use it to adjust the fuel pressure at any stage of boost.
Keep in mind that larger injectors and fuel pump may mean that you're running lean/rich at idle. Look into fuel pressure regulators (fpr's) or adjustable fpr's (afpr's). These will help adjust the fuel pressure at idle since FMU's only deal with boost. I still have some research to do on afpr's because I've heard that they can increase pressure in boost, too, but don't quote me on that.
Hope that helped.
Blown.
well thank you for all your help. I will order a cartech fmu and i was wondering if you all would happen to know of a fuel pump that I could pull out of the junkyard that would work for my turbo purposes or do I have to get a new one as im on a super tight budget!!
Oh - one more fuel question- what type/size of injectors would you guys recomend for running low boost because I want to order them soon but I have no clue what I need. Sorry for all the "new kid on the turbo side of the street" questions.
And based on your advice I will try and send the xs power turbo back when I get it because it sounds more like a bomb than a turbo. Wish I had asked first. Crap.
Thanks Again.
