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Old 03-02-2010, 07:29 PM   #21
cliffyk
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It also says that it's a direct bolt in for the 05+, would that not lead you to think that it has the same transfer function as the stock 05+, or do you think they just mean that it will bolt in, but still need tuning.

If it's a direct bolt-in that has the same transfer function then it's a stone cold waste of money as it would be the functional equivalent of the OEM unit.
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Old 03-02-2010, 07:39 PM   #22
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I see, I'm not sure I completely understand your other post though. Do you think s/f has a maf t/f thats close, or did I not find the actual t/f of this sensor in the first place?
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Old 03-02-2010, 08:01 PM   #23
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I see, I'm not sure I completely understand your other post though. Do you think s/f has a maf t/f thats close, or did I not find the actual t/f of this sensor in the first place?
According to their worksheet, the 75mm housing you linked to, with the PMAS HPX sensor, can measure mass air flows of about the same at 5.0V (1240kg/h) as the Special Forces "24 lb" drop-down selection (1220kg/h), and has a similar curve.

However as I said earlier, this is quite a bit less than a plain ol' stock 80mm MAF from a '99 to '04 GT can measure. I don't understand why you want to use it on your car, why aren't you looking at the larger diameter housings VMP offers?

Also, in a blow-through installation you need yet a larger MAF as the elevated intake air temperatures make the air less dense, despite its being compressed...
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Old 03-02-2010, 08:09 PM   #24
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Idk, it said it can support the hp I was planning on making and thought that if I had a 3" pipe from the intercooler to the 95mm Bazooka or the BA series it would mess with the maf since it will be stepping up and then back down again to go the the t/b. Do you see no problem with that? Since I honestly don't know what maf would you suggest for a setup like this. Forged .020 over 4.6 with Trickflow heads, edelbrock intake, turbo cams, 60lb injectors, twin 255lph pumps and an on3turbo kit with the Masterpowers upgrade. Should I just go with the bazooka or the ba3000 and call it a day?
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Old 03-02-2010, 08:26 PM   #25
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I don't know, as I said actual mass air measurement gets strange in blow-through situations because of the extreme air temps. If your inter-cooler is 75mm then I suppose there really isn't any point of having a larger MAF housing, however I am certain that 2650lb/h of air (as is indicated at 5.0V output on their worksheet) will not support much more than 400 fwHP at 11.5:1 AFR. The stock 80mm unit can do better than this.

2650lb/h of air / 11.5:1 AFR = 231 lb/h of fuel. At a BSFC (Brake Specific Fuel Consumption) of 0.6lb/HP (rule of thumb for f/i) that's 384 fwHP.

I have never used a blow-through setup, don't like 'em (barring leaks there's nothing that happens to the air in a blower or intercooler that alters it's mass), so maybe there's some magic there, but the numbers they provide don't seem right to me...
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New ride (7/1/2013) 1998 Mercedes SL500-5.0L 32V VVT 326/347 HP/tq


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Old 03-02-2010, 08:27 PM   #26
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Appendix A. page 110...and I think you are correct as he says it affects only 2002+ EEC-V PCMs.

I just looked at a 2000 MY Special Forces template and found that the >1700 kg/h scaling indicator is not set...

Hey even a stopped watch is right twice a day

This would explain why my PCM does not experience this issue but most of the cars / trucks I have tuned have been affected. I never seem to touch anything that's not 2002+ and normally a lightning or a Cobra.
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Old 03-02-2010, 08:33 PM   #27
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Hey even a stopped watch is right twice a day
I have a Russian 24-hour watch that would only be right once a day were it stopped--this much better fits the workings of my 62 year-old brain...
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New ride (7/1/2013) 1998 Mercedes SL500-5.0L 32V VVT 326/347 HP/tq


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Old 03-02-2010, 08:52 PM   #28
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I thought Lizzyfan was running this maf on his blow through setup and making somewhere around 430rwhp.
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Old 03-02-2010, 09:06 PM   #29
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I thought Lizzyfan was running this maf on his blow through setup and making somewhere around 430rwhp.
That would be possible--it's a bit over the "rule-of-thumb" (RoT) sizing formulae, but not that far over...

The RoT sizing formulas are starting points for selecting the right components in the first place, not 100% infallible calculations.

Nonetheless, when someone say they are supporting 640 HP with 2650lb/h of air my meter goes:

Click the image to open in full size.
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New ride (7/1/2013) 1998 Mercedes SL500-5.0L 32V VVT 326/347 HP/tq


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Old 03-02-2010, 09:37 PM   #30
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Idk, it said it can support the hp I was planning on making and thought that if I had a 3" pipe from the intercooler to the 95mm Bazooka or the BA series it would mess with the maf since it will be stepping up and then back down again to go the the t/b. Do you see no problem with that? Since I honestly don't know what maf would you suggest for a setup like this. Forged .020 over 4.6 with Trickflow heads, edelbrock intake, turbo cams, 60lb injectors, twin 255lph pumps and an on3turbo kit with the Masterpowers upgrade. Should I just go with the bazooka or the ba3000 and call it a day?
I would go with the Bazooka. I am using the BA3000 and even though it was listed for use in special forces it was off and the car wouldn't run right. But Chris at Sniper emailed me a couple modified tunes based on my feedback and its running well now.
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Old 03-02-2010, 09:37 PM
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