ECU/Injector questions.

[drEameRvaJ]

How is the performance with a top-feed injector vs. an side-feed?And I am lost on how tuned ECU's are suppose to work.Tuned ECU's can be tuned to whatever injector sizes correct?So if I want to run 650CC's but not gonna be using that much fuel is it gonna affect the car's performance?And how does Enthaply or JWT know what boosts we can and cannot run?Is a boost-controller still needed?Ahh I have a bunch of questions, and trust me I've searched for the past few days on all this stuff.Thanks for reading.I'll love to read some replies.

[hannibal]

ECUs can be tuned for nearly any sized injectors. It needs to know how big they are so I work tell them to open for the correct amount of time. Once the ECU knows youre running injectors say twice as big as stock, it can tell them to open for half the time of stock injectors.

No tuned ECUs that I know of have built in boost controllers, so thats something you'll have to get separately.

I know Enthalpy asks how boost youre running when you get an ECU from him. I dont think JWT asks. Go with Enthalpy. He tunes them much more liberally than JWT does, so you should see more power from his ECU.

[BlackHat]

If you get too large of injectors you start to run into problems where they have to turn on then off too quickly (otherwise it's dumping too much fuel). Basically, if you were to run a stock ka with 650cc injectors, the ecu would have to be able to run a pulse width that was way too small for the injector to even use. It's best to choose an injector that can run at 80% at WOT (someone verify that last sentence, I think that was it). You would definately have idle problems with oversized injectors.

Yes, you will need to do something with your ecu to accomidate larger injectors. The ecu has to keep track of your pulse width based on a bunch of engine conditions. (pulse width basically being how long to keep the injector on) If you change the size of your injectors, then your settings in your ecu are incorrect. You have several options on what to do with your ecu. Either send your ecu to someone who can modify it (JWT, Enthralpy, etc.) or get another standalone (AEM EMS?, MegaSquirt, etc). I'm not sure if a piggy back can manage injector size changes... maybe someone else can anwser that.

"And how does Enthaply or JWT know what boosts we can and cannot run?"This was just covered in a post and it got a little confusing for me. I'll see if I can find the post and put the link up rather than try to anwser it.

Sorry, maybe the next guy can fill you in on the rest.

[drEameRvaJ]

Can't you just lean out some of the fuel with the S-AFC?And has anyone heard from Enthaply?I e-mailed him about a week and a half ago, and he hasn't e-mailed me back.I bought my turbo stuff knowing I wanted him to tune my ECU.Well any suggestions would be greatly appreciate.Thanks!

[Chezedik]

Enthalpy is a ***** to get at. Here is the deal: like Blackhat said, you will need to reduce the duty on a larger injector. For that you change the K value. To get full use of 650's you will need a larger AFM like the N60, N62, Q45, or Cobra MAF. Then, to truly do justice to those injectors boost will have to go up. This will require a higher boost setting (controller, electronic, although more expensive will allow you a lot of opportunities that mechanical will not). If you decide to go tuned ECU, the preferred choice is Enthalpy, because the timing is not supposed to be as conservitive (sp?). But MPG will hurt for this unless the tune is flawless. The biggest deal about Enthalpy vs JWT is that Enthalpy is much more ready to re-tune if your dyno results show probs. It is supposed to be free, so long as you send back the old prom. Me?, I am running Emanage (blue) with ignition and injection harnesses, will be buying the knock and MAP harnesses, so it basically will be (nearly) standalone with self-control.

[drEameRvaJ]

Tuning an e-manage, you need a labtop don't you?What's the biggest pros and cons with a e-manage vs. a S-AFC?I'm about to buy an S-AFC.Let me know.Thanks!

[s14noob]

my ecu is being tuned by enthalpy. this is what he needed to know

Turbo specs Injector size and manufacturer. Z32 Maf Internal Engine work Headwork Cam selection Intake manifold selections Turbo manifold selection. Fuel octane to be used.

[Chezedik]

Emanage is nice because it is expandable, and with ultimate being out now you can get them very affordably. The downside is if you get it you can spend a small fortune to do everything you want. Also, it is a little tougher to work with than SAFC (from what I have heard).

[drEameRvaJ]

It's been soo long since I posted this topic, and I'm still not TURBO'ed.

I didn't want to make another topic cause I wanted to save NICO widthband.

Anyways, has anyone heard anything about Scott (Enthalpy) tuning ECU's? Is he still doin' it? I will need one SOON!

Thanks!

[WDRacing]

Nope, I haven't heard of anyone using him as of late.

[drEameRvaJ]

Mmm.... JWT is my only choice than?

I guess no one gets their ECU tune anymore, since more and more KA-T guys are just doing it on their own now. I wish I could do it myself, but I don't trust myself enough to be doing that kind of stuff. L O L.

[WDRacing]

Nothing wrong with knowing your limits...

[drEameRvaJ]

I would rather get a ECU tuned, plug and play and smooth out rough spots with my S-AFC. That was my plan from the beginning.