Going to the dyno soon...

[gomer23]

Since the 240 is finally running pretty well, its time I get it tuned. Basically the mods are:

-RB25DET S1-Walbro 255-Nismo FPR-Turbonetics T3/T4 ball bearing 50trim-3" Exhaust-FMIC-S-AFC2

Just looking to get it mildly tuned, probably set the timing at 18degrees and boost at 8psi. I am on stock injectors and I realize that is holding me back which is why I figured I should stay at 8psi, unless you guys think it would be safe to go to 9-10. But I'll be sure to post results when I get them.

[eh?]

Really no point with a s-afc and stock ecu. The ecu will probably go into rich&retard.

[l0nestar]

eh?,

Are you saying that an S-AFC2 is not that useful for lightly tuned vehicles with the stock ECU? If so, what are they good for? Or are you suggesting to upgrade the stock ECU to an enthalpy?

[Shocker]

dont be a bum get some 520's then tune her.. whats the point in throwing the stock injectors past 80% duty to get a number? that can terminoly hurt your motor in the long run.. better to be safe than sorry.. not to mention the money to get it tuned could be thrown towards some injectors also.

[krayton]

Really no point with a s-afc and stock ecu. The ecu will probably go into rich&retard.

exactly. get something nice to tune. no need to waste dyno time

[lucky7]

i agree. drive it as is while you get a PFC and injectors.

[eh?]

Due to the nature of the stock RB25 ecu and the price of a used Power fc, it's my opinion the s-afc is a waste of money. (I've owned an s-afc [not used], power fc and now the aem ems) The stock rb25 ecu is very aggressive when it sees to much load. The S-afc can't compensate for the timing the ecu pulls. I don't think it's worth the dyno time if you're not covering all the bases...

BTW: I don't think enthalpy does RB25 ecu's.

[l0nestar]

eh?,

I realized when you said that about Enthalpy, he only tunes S-13 / 14 ecu's. I get the feeling that I may have wasted $200 when I purchased the S-AFC2 then. Thanks for the info. Are there any places that you suggest to purchase the PFC from? Is the Hand Commander a good idea? Maybe I'm just an ididot, but I thought when I get my harness re-wired, I would be using the S-13 ecu, not the RB25 ecu... PFC says it replaces the ECU as well..

I'm reading the documentation from A'Pexi now..

[gawdzilla]

eh?,

I realized when you said that about Enthalpy, he only tunes S-13 / 14 ecu's. I get the feeling that I may have wasted $200 when I purchased the S-AFC2 then. Thanks for the info. Are there any places that you suggest to purchase the PFC from? Is the Hand Commander a good idea? Maybe I'm just an ididot, but I thought when I get my harness re-wired, I would be using the S-13 ecu, not the RB25 ecu... PFC says it replaces the ECU as well..

I'm reading the documentation from A'Pexi now..

the ECU you use is for the MOTOR, not the car. to install the pfc you take out your ecu and plug the pfc in place of it. its a new ecu. the hand commander is good for doing basic diagnostics and monitoring. changing anything but large gross adjustments with it sucks and you should get fc datalogit or apexi power excel for that (which is a hidden cost on top of the pfc+commander cost most people dont realize they're getting into). so in the end its about $730 (pfc+hand controller) + $350 (datalogit). IMO thats when you have a "complete" tuning setup that you can adjust/log/tune how you want. if you dont have datalogit you pretty much need to go to your "local tuner" and dump money every time your setup changes or the weather changes dramatically.

[gomer23]

Yes I realized what I got myself into with the S-AFC2. I bought with the impression I got from people I know that it would be better than nothing for the time being. I got it pretty cheap and will be able to resell if for what I paid for it when I am done using it so that was my reasoning behind it. But if its not worth paying someone to tune with I will get a little done myself then just go see what its putting down and compare the Dyno's AFR reading to my wideband (which is really what I want to check out).

While on the subject of injectors what injectors do most people step up to from the stock ones?

[l0nestar]

550cc from Datchwerks (also a sponsor). If your injectors are in decent shape, you can get $150 credit for them.

[l0nestar]

Gawdzilla,

I see. How would this compare to just going for the Emanage Ultimate? I already have a laptop that I can use to tune it with. The nearest dyno is either 170 miles (St. Louis) or 80 miles (Avon / Indianapolis) that I know of. (I can ask around for shops in Indy. RepoMan would have a good idea of this..)

I'm running a stock S1 RB25, is there really a need for a different ECU ATM? The only additions I'm looking at are a FMIC and possibly a tubular exhaust header.I should probably just start a new thread for me instead of jacking Gomer's

Anyways, thanks for the help.

[gomer23]

Haha, I dont care, I am trying to soak up as much as this "tuning" stuff as I can.

[l0nestar]

Aye,

Thanks man

[gawdzilla]

Gawdzilla,

I see. How would this compare to just going for the Emanage Ultimate? I already have a laptop that I can use to tune it with. The nearest dyno is either 170 miles (St. Louis) or 80 miles (Avon / Indianapolis) that I know of. (I can ask around for shops in Indy. RepoMan would have a good idea of this..)

I'm running a stock S1 RB25, is there really a need for a different ECU ATM? The only additions I'm looking at are a FMIC and possibly a tubular exhaust header.I should probably just start a new thread for me instead of jacking Gomer's

Anyways, thanks for the help.

you don't really need any engine management until you change turbos, injectors, maf, or cams... the rest can pretty much be handled by the stock ecu. i've never seen the e-manage so i dont know how or how well it works. keep in mind that going to a dyno isnt really the "end all" to your tuning. you can't always assume a shop is going to know how your motor behaves to adjustments, nor can you assume they are familiar with your EMS to make adjustments...

from my experience with the pfc, i like it a lot. its just that you need to have datalogit or power excel to take advantage of it. otherwise its just a slightly fancier safc with more monitoring capability. i've tuned my car mostly on the street, and once on the dyno just to get a number... the shop didnt really do anything except put my car on the rollers and give me the numbers..

[l0nestar]

I see. I guess I should have researched the SAFC before purchasing it thanks for the info.

[gomer23]

mine seems to be working ok for the time being. But you should be able to sell it for what you paid for it.....at least I am counting on that haha.

[l0nestar]

$200 for an S-AFC2 unused in box. (well, it has been out of the box, but the unit is like new. Also has the mounting bracket. That a fair price?

[gomer23]

I paid 170 for mine shipped, only thing it didnt have was the mounting bracket or instructions.

And quick question about the Power FC, is there any limitations on power or anything like that for it? I just briefly read the overview of it on Apexi's website and was curious what power levels people use these at. Also are there any good forums or other sites to research further about it?

[eh?]

RB25 pfc is limited to the resolution of the Z32 maf which is around ~550whp.

[gomer23]

Oh well thats plenty then for me haha. Well then a PFC will be coming this winter.

[300Plus]

Im thinking of going mega squirt whatcha think?

[gomer23]

Well we had a pretty well known Megasquirt tuner here that now works elsewhere and It seems like a real cool system if you know how to work and install it. Its a pretty DIY system. Someone on here (DETurbine) will be running it whenever he get his car up and running. He might be able to answer some more questions that I can.