Si BMS intake

2tone

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He has v1 Ktuner as opposed to the v1.2 or v2 models available now
Ahhh I forgot the v1 existed for a bit way back lol. I got real lucky and ordered my Ktuner one of the first days v1.2 started shipping instead of v1
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Myx

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Ancient hardware? Elaborate please I’m confused lol
Sorry for the confusion. I was just saying I am using Ktuner V1. Versus using a V1.2 or version 2. Just disregard the ancient reference.
 

Pur3MotioN770

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So I installed the BMS intake (Factory Calibration), with the stock Intake Hose, on my Sport Hatch Sunday evening, and have had it on since then.

The Intake sounds great, and Intake Air Temps seem to be lower than with the stock box, especially when the A/C is on. With the stock box, temps were usually 30-40 over ambient, although higher in traffic. With the BMS, seems temps are about 10 degrees lower than that.

One problem I had with the stock box, that the BMS remedies, is the temperatures after heatsoak. With the stock box, temperatures would get pretty hot, but not really come down much after the fact. With the BMS, while it does heatsoak, and temps get pretty high, once you're moving, they come down fairly significantly.

I'm not sure why, or if I did something wrong, but short term fuel trims so far don't appear to be ideal, as I've seen STFT as high as +40, although normally, with this Intake, they seem to flucuate from +15 -+30 ish. LTFT has stayed at a constant 0%. I've tried flashing to stock, and cleaning my MAF sensor, and I've checked that everything is connected properly, but haven't seen a change. Part of me thinks I was possibly sent the wrong MAF housing or something. I will include some logs and a couple videos

When installing initially, I lost one of the screws that secured the MAF sensor to the housing, which I thought could have been the cause of the odd fuel trims, but ended up replacing the screw, and still had issues.
 


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86salmon

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Thanks for your observations and the data logs. The sound clip is an added bonus. Mine sounds exactly like that.

Your temps are pretty awesome.

I find the trims a little concerning too. They seem overall high as opposed to your earlier, pre intake log. It almost looks like it could be a leak. You already checked the MAF sensor. Is your MAF housing seated and clamped down well? I had to adjust my clamps when using the stock hose to make sure it wasn't leaking.

Other thoughts. I noticed on your older log and these new ones your ltft is a rock at zero. Have you calibrated to this or is this a flex fuel thing? It doesn't really match with your stft fluctuations
 

Pur3MotioN770

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Thanks for your observations and the data logs. The sound clip is an added bonus. Mine sounds exactly like that.

Your temps are pretty awesome.

I find the trims a little concerning too. They seem overall high as opposed to your earlier, pre intake log. It almost looks like it could be a leak. You already checked the MAF sensor. Is your MAF housing seated and clamped down well? I had to adjust my clamps when using the stock hose to make sure it wasn't leaking.

Other thoughts. I noticed on your older log and these new ones your ltft is a rock at zero. Have you calibrated to this or is this a flex fuel thing? It doesn't really match with your stft fluctuations
I've been thinking it could be a leak too, although everything appears tight. I've also been thinking the spool up sound is slightly weird. I'll have to recheck the clamps. Is it necessary to use a socket to tighten them, cause all I used was a screw driver? Not sure why my LFTF stays at 0, can't be related to flex fuel, as my pump gas (93) custom tune also shows the same value.
 


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86salmon

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I've been thinking it could be a leak too, although everything appears tight. I've also been thinking the spool up sound is slightly weird. I'll have to recheck the clamps. Is it necessary to use a socket to tighten them, cause all I used was a screw driver? Not sure why my LFTF stays at 0, can't be related to flex fuel, as my pump gas (93) custom tune also shows the same value.
I used a socket wrench for mine. Hopefully that does it
 

Pur3MotioN770

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After making some minor adjustments, and post MAF cleaning,
Here's logs from today's drive to and from work.
Temp was 59-60 degrees in the AM.
STFT were better, hovering around +7 - +15 for the most part, although part throttle lower rpm trims were still a little high at times, in the +20 area.

Evening Temps were 65-67
Idle at start seemed higher than before intake, starting at about 1k, gradually going down, with STFT starting at around +20 and decreasing. Once they came down, in traffic, car idled at 700 rpms, with STFT at +8 - +12.
STFT still seemed elevated cruising at lower rpms (2500).

Gonna drive a day or two more, to see if anything else changes. Might also see if using the PRL Silicone Hose does anything.
 

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86salmon

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After making some minor adjustments, and post MAF cleaning,
Here's logs from today's drive to and from work.
Temp was 59-60 degrees in the AM.
STFT were better, hovering around +7 - +15 for the most part, although part throttle lower rpm trims were still a little high at times, in the +20 area.

Evening Temps were 65-67
Idle at start seemed higher than before intake, starting at about 1k, gradually going down, with STFT starting at around +20 and decreasing. Once they came down, in traffic, car idled at 700 rpms, with STFT at +8 - +12.
STFT still seemed elevated cruising at lower rpms (2500).

Gonna drive a day or two more, to see if anything else changes. Might also see if using the PRL Silicone Hose does anything.

My stft have peaks at both +/- 20 but my average trends are still very close to zero.

Yours are still pretty lean. +10-15 looks like the average trend. At higher rpms they come down.


I looked at your old log again. The trims for stock housing/airbox are really dialed in. Do you think it could be sensitive to the increased air flow?I hate for you to shelve your custom tune for an OTS base tune, but it's something to check and see

Another thought. Is it possible they may have sent you the race MAF housing by mistake?
 

Pur3MotioN770

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My stft have peaks at both +/- 20 but my average trends are still very close to zero.

Yours are still pretty lean. +10-15 looks like the average trend. At higher rpms they come down.


I looked at your old log again. The trims for stock housing/airbox are really dialed in. Do you think it could be sensitive to the increased air flow?I hate for you to shelve your custom tune for an OTS base tune, but it's something to check and see

Another thought. Is it possible they may have sent you the race MAF housing by mistake?
BMS mentioned that they're fuel trims for the race MAF were set to +12%, so yea I'm thinking it's possible this could be the wrong housing. I also think as you said, it may be sensitive to the increased airflow.
 

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My stft have peaks at both +/- 20 but my average trends are still very close to zero.

Yours are still pretty lean. +10-15 looks like the average trend. At higher rpms they come down.


I looked at your old log again. The trims for stock housing/airbox are really dialed in. Do you think it could be sensitive to the increased air flow?I hate for you to shelve your custom tune for an OTS base tune, but it's something to check and see

Another thought. Is it possible they may have sent you the race MAF housing by mistake?
Hi.
I am considering intake mod. What would you recommend? PRL CAI cobra or BMS?
Not too many users of BMS around...
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