Any alternatives to APEXI NEO
Rotary Freak
Joined: Jul 2016
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From: Beeton, Ontario
There are also the older models. IIRC it went Apexi SAFC, SAFC II, then SAFC Neo. So you could save some money buying used and looking for an older model.
Is there a specific reason you don't want the Neo?
Is there a specific reason you don't want the Neo?
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Full Member
Joined: Aug 2020
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From: North Dakota
only reason is I hear it’s a pain. And not that good of a solution I guess
Rotary Freak
Joined: Jul 2016
Posts: 1,838
Likes: 597
From: Beeton, Ontario
The main benefit to the SAFC is that it is significantly cheaper than a standalone ECU. It's a bit crude but IIRC the issue you were having in your other thread was a lean mixture. All things being equal, the SAFC will let you tune that out.
The happy-medium is something like an rTek. They aren't produced anymore unfortunately but if you can find one used it gives you control over fuel, timing, etc. You don't have to cut the stock harness, which is a plus.
The best solution is a standalone that will let you have complete control, but obviously this costs significantly more to install. Plus you need a custom harness, connectors, etc. Not to mention a tune if you can't do it yourself.
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Joined: Aug 2020
Posts: 220
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From: North Dakota
Its a good solution relative to budget and ease of installation. It's not the best solution, but it's okay if all you need to do is fuel correction.
The main benefit to the SAFC is that it is significantly cheaper than a standalone ECU. It's a bit crude but IIRC the issue you were having in your other thread was a lean mixture. All things being equal, the SAFC will let you tune that out.
The happy-medium is something like an rTek. They aren't produced anymore unfortunately but if you can find one used it gives you control over fuel, timing, etc. You don't have to cut the stock harness, which is a plus.
The best solution is a standalone that will let you have complete control, but obviously this costs significantly more to install. Plus you need a custom harness, connectors, etc. Not to mention a tune if you can't do it yourself.
The main benefit to the SAFC is that it is significantly cheaper than a standalone ECU. It's a bit crude but IIRC the issue you were having in your other thread was a lean mixture. All things being equal, the SAFC will let you tune that out.
The happy-medium is something like an rTek. They aren't produced anymore unfortunately but if you can find one used it gives you control over fuel, timing, etc. You don't have to cut the stock harness, which is a plus.
The best solution is a standalone that will let you have complete control, but obviously this costs significantly more to install. Plus you need a custom harness, connectors, etc. Not to mention a tune if you can't do it yourself.
Rotary Freak
Joined: Jul 2016
Posts: 1,838
Likes: 597
From: Beeton, Ontario
Based on your description in your other thread it sounds like the Neo would do what you want. On S4s we only have a narrow range TPS, so it sounds like you'll just need to set the low throttle map in the 2000rpm area to be richer.
I'm no expert, but I'd also do what DR Knight mentioned in that thread and double check the fuel system. I find it a bit weird that you're running that lean in that range, since a stock TII shouldn't do that. This would be expected at high rpm since you have a freer flowing exhaust, but at low rpm it seems a bit unusual.
I'm no expert, but I'd also do what DR Knight mentioned in that thread and double check the fuel system. I find it a bit weird that you're running that lean in that range, since a stock TII shouldn't do that. This would be expected at high rpm since you have a freer flowing exhaust, but at low rpm it seems a bit unusual.
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