ECU or safc

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IanS13
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ECU or safc

Postby IanS13 » Wed Sep 15, 2004 4:01 pm

well after talking to a few turbo experts, i have been advised to use some other fuel management rather then just a FMU, the ecu is $500+ and is plug and play am guessing, but i don't have that coin to spend rigtht now so a safc is like $249 but will need some wireing. am leaning to the safc because it's cheaper but will be just as good as a ecu upgrade and how hard are they to install.


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574-240sx
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Re: ECU or safc (IanS13)

Postby 574-240sx » Wed Sep 15, 2004 4:10 pm

What size injectors will you be controlling. Yes Safc is better than a FMU, but I would get a wideband to tune your air/fuels. Also with the SAFC you can change to different MAF, and control up to 50% larger injectors with the new SAFCII. Nick

IanS13
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Re: ECU or safc (574-240sx)

Postby IanS13 » Wed Sep 15, 2004 4:23 pm

well the thing i will be running stock injectors and 6psi,also my FMU came with a 12:1 ratio should i even start the car with this ratio, am trying to get a recalibration kit.

Structure240sx
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Postby Structure240sx » Wed Sep 15, 2004 4:31 pm

that fmu will make you run way too rich. i also would not push 6psi on stock injectors unless you were running a t25 or smaller turbo.

jsut get some 370's, safc, and a wideband. the safc's can be had for under $200 like mine

IanS13
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Re: (Structure240sx)

Postby IanS13 » Wed Sep 15, 2004 4:36 pm

were can i get one for under $200 also it's a t3 50trim .why would i need a wide band if i have the safc don't they monitor the air fuel ratio.
Modified by IanS13 at 3:51 AM 9/16/2004

:: orion ::
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Postby :: orion :: » Wed Sep 15, 2004 6:31 pm

S-AFC or FMU...neither offers any type of timing control.

You need something to retard timing if you're planning on any more than 4-5psi from that T3.

You can knock the base back a few degrees and be OK in most cases...but that's not a definite.

A retuned ECU (like the JWT setup) is very safe and reliable, but will not make the most power, due to the conservative nature of the timing curve.

Bear in mind, fuel is only half of "tuning".

Timing is what blows KA-Ts...you can run pretty lean and not detonate, but too much timing will kill it quickly. FYI...

- Brian

IanS13
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Re: (:: orion ::)

Postby IanS13 » Thu Sep 16, 2004 1:37 pm

so i might get away with turning the timing down a little or should i not even risk it.

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Jookmasta
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Postby Jookmasta » Thu Sep 16, 2004 9:03 pm

i still struggle with this question and would love to have some feedback on it. i do have an safc and 370cc injectors. nothing is installed yet but i am wondering what options us ka-t people have when it comes to timing. i hear that the best way, as said by brian, is the jwt ecu. peace of mind is definite when u use the jwt ecu. my problem is the 500 dollars for the ecu. some people say to just retard the timing a few degrees or to run a msd btm. also i think the emanage may solve this problem also.what do yall suggest? im leaning towards the jwt route but has anyone gone a different route and if so how have the results been?

by the way, lookin to run 8 pounds and it is a daily driver

NateDogg
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Postby NateDogg » Thu Sep 16, 2004 9:10 pm

The MSD BTM is a great way to keep your stock maps and driveability while keeping your engine safe and pockets healthy. People have had issues "Structure240sx" I believe, with the Emanage, because it alters the MAF and that puts the timing maps way outta whack.

Honestly, I don't know why more people aren't running a BTM.

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virus77
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Postby virus77 » Fri Sep 17, 2004 5:34 am

If you are running only 370cc injectors on the emanage then it will not throw off the timing maps enough to matter. I use it and retard timing based on boost at any increment I want and it works great, I might even try it with big injectors and retard enough timing based on boost that it compenstates for the advanced timing.

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98s14inaz
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Re: ECU or safc (IanS13)

Postby 98s14inaz » Fri Sep 17, 2004 12:53 pm

Well my friend you can either spend the $ now or spend more $ later when it detonates. The ecu does more than control fuel. It also retards the timing under boost something the safc doen't do. If you want reliable power you should do it right the first time.

I see ecu's on this board and others for $400 all the time. Go to ebay for injectors/ fuel pump, JGY for the fuel rail. You are still way under a $1k for really good quality fuel supply and control. Unless your engine is in really bad shape you should be fine. Good luck.

IanS13
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Re: ECU or safc (98s14inaz)

Postby IanS13 » Fri Sep 17, 2004 3:38 pm

i got the 255 fuel pump am doing a blow tru system does it matter that it's blow tru and not pull tru.

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98s14inaz
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Postby 98s14inaz » Sat Sep 18, 2004 4:26 am

Nope. Just use hairspray on the silocon couplings to make sure they don't pop off. The mafs doesn't have a lip on it so be careful.

IanS13
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Re: (98s14inaz)

Postby IanS13 » Sat Sep 18, 2004 12:41 pm

tru thanks.

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Tx-Sx-FS
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Re: ECU or safc (IanS13)

Postby Tx-Sx-FS » Sat Sep 18, 2004 4:58 pm

so whats have people decided on the timing issue? can i just retard the timing a degree per psi or whatever? i will be running the ca18det 370cc injectors in my ka24e engine but need to find what size resistors to use to run safely.

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98s14inaz
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Re: ECU or safc (Tx-Sx-FS)

Postby 98s14inaz » Sat Sep 18, 2004 5:40 pm

You are missing the point. You can retard your timing for every psi and your car will run like $hit until you hit boost, then it might run right.

With a JWT ecu it automatically adjusts the timing so when you aren't boosting you car runs similar to NA and when you are on boost timing retards according to engine temps and other variables.

Also injectors 50lbs and under are usually high impedance, you will not need resistors for those.

If you want reliability that won't explode on you buy and install the following...

JWT ecu with appropriate injector/maf program

stage I minimum-walbro fuel pump-NGK bkr7e-11 spark plugs-370cc minimum injectors

stage II-walbro fuel pump-NGK bkr7e-11 spark plugs-500cc minimum injectors-upgraded mafs z32 or ford cobra

Run this with any turbo kit you want. It is always best to spend a little more to protect your investment in the long run. You wouldn't buy a stereo and sub and leave your car unlocked with no alarm? Do it right and as long as you motor isn't trashed you will be fine.

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98s14inaz
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Re: ECU or safc (Tx-Sx-FS)

Postby 98s14inaz » Sat Sep 18, 2004 5:44 pm

You are missing the point. You can retard your timing for every psi and your car will run like $hit until you hit boost, then it might run right.

With a JWT ecu it automatically adjusts the timing so when you aren't boosting you car runs similar to NA and when you are on boost timing retards according to engine temps and other variables.

If you want reliability that won't explode on you buy and install the following...

JWT ecu with appropriate injector/maf program

stage I minimum-walbro fuel pump-NGK bkr7e-11 spark plugs-370cc minimum injectors

stage II-walbro fuel pump-NGK bkr7e-11 spark plugs-500cc minimum injectors-upgraded mafs z32 or ford cobra

Run this with any turbo kit you want. It is always best to spend a little more to protect your investment in the long run. You wouldn't buy a stereo and sub and leave your car unlocked with no alarm? Do it right and as long as you motor isn't trashed you will be fine.

TomP1erce
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Re: yep I retarded my stock timing 4 degrees back from 18* (.5* per psi of boost)

Postby TomP1erce » Tue Aug 24, 2021 8:22 pm

But I did have to remove the ignition control circuit so the ecu didn't try to advance timing on me keeping it running a bit rough at idle but keeps cyl pressures safe in boost

TomP1erce
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Re: yep I retarded my stock timing 4 degrees back from 18* (.5* per psi of boost)

Postby TomP1erce » Tue Aug 24, 2021 8:24 pm

But I did have to remove the ignition control circuit so the ecu didn't try to advance timing on me keeping it running a bit rough at idle but keeps cyl pressures safe in boost


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