Thread: Maxing out G/Sec on MAF Frequency Table

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  1. #1 Maxing out G/Sec on MAF Frequency Table 
    GT Level Member 94GrandPrixSE's Avatar
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    Has anyone ran into the problem of maxing out your maf table? Not the frequency but the max g/sec in the horizontal chart. It has a max of 4,XXX something and im right at that at around 10,000 Hz. I am using a mini afc at 70%.
    02 GTP - Cartuning Turbo Kit VS67 3" DP, 80#INJ, N*,LQ4 MAF, Custom Cam, Roller Rockers, 130#, P&P Heads, Meth, AL103's, Corn fed, 522WHP on a mustang dyno, HP Tuners by me.
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  2. #2 Re: Maxing out G/Sec on MAF Frequency Table 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    In HP Tuners?

    Some values in HPT do just stop so using Hz or dynamic airflow is used.

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  3. #3 Re: Maxing out G/Sec on MAF Frequency Table 
    GT Level Member 94GrandPrixSE's Avatar
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    image — imgbb.com in the pic you can see the max is 4,063 lb/hr I am just about there at 3,824 and my buddy’s car is maxed out at 4.063 from 10,000 on up. I’m not sure what you mean.
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  4. #4 Re: Maxing out G/Sec on MAF Frequency Table 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    Without the picture it seemed like you are talking about the scanner function at first. My response was about certain parameters in the scanner that have a max value they will report.


    If you are reaching the max of the actual airflow in the MAF table you need to change to a different MAF sensor to gain back resolution. The MAF you pick needs to have a larger diameter housing so it can keep you within the limits of the MAF table.

    I don't know the sizes off hand that well but say you are using a 78mm MAF housing, going to a 85mm MAF housing would be the way to go. I can't remember if the LS1 or LT1 MAF's are the ones larger than the truck MAF.

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  5. #5 Re: Maxing out G/Sec on MAF Frequency Table 
    GT Level Member 94GrandPrixSE's Avatar
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    I thought the frequency was directly related with the lb/hr measurement. So my buddies car that is E-85 has way less are flow than my turbo setup as im using a afc controller at 70% and around the same frequency as him wot. His is completely maxed out at 4,063 lb/hr passed 10,00 hz. We are both using an LQ4 MAF. Is there any other walk around besides a new maf? which I believe would be the ls7 one.
    02 GTP - Cartuning Turbo Kit VS67 3" DP, 80#INJ, N*,LQ4 MAF, Custom Cam, Roller Rockers, 130#, P&P Heads, Meth, AL103's, Corn fed, 522WHP on a mustang dyno, HP Tuners by me.
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  6. #6 Re: Maxing out G/Sec on MAF Frequency Table 
    GXP Level Member GTPpower's Avatar
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    A bigger maf isn't really the best answer, especially with the issues people have with the ls7's.

    Scale back both the maf table and the ifr table the same amount. (90% or something). This will get you away from the hard limit.
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  7. #7 Re: Maxing out G/Sec on MAF Frequency Table 
    GT Level Member 94GrandPrixSE's Avatar
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    Scale these just in the tune themselves correct?
    02 GTP - Cartuning Turbo Kit VS67 3" DP, 80#INJ, N*,LQ4 MAF, Custom Cam, Roller Rockers, 130#, P&P Heads, Meth, AL103's, Corn fed, 522WHP on a mustang dyno, HP Tuners by me.
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  8. #8 Re: Maxing out G/Sec on MAF Frequency Table 
    GXP Level Member GTPpower's Avatar
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    Yes


    2001 GTP Drag Car - XPZ, Tischler heads, Upsidedown M90 IC'd, e85, Gen V, 2.3 w/ 5%OD
    2005 F350 6.0 - studded, deleted, tuned
    2001 GTP - cam, headers, nitrous, stock trans - 11.83 @ 116 <$2k in mods - sold
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  9. #9 Re: Maxing out G/Sec on MAF Frequency Table 
    SE Level Member jaydubb71's Avatar
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    !!!RESURRECTION FROM THE DEAD!!!

    Im in the same boat here. Remote tuning "Hellboi" and maxed the flow rate of the MAF table. Will be scaling soon. I will this forum would get more action. We need more info.
    1998 GTP Coupe: Self-tuned with HPTuners, 3.4, FWI w/ 12 inch K&N, Autolite 103's, hot-wired FP, Caspers fan override, 180 t-stat, Speed Daddy headers, SLP exhaust w/ GTX tips, 12 inch brakes (Riviera/Impala), 6000K HID's, solid rubber engine and trans mounts, poly dogbone inserts (SOLD 3/2020!!! )
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  10. #10 Re: Maxing out G/Sec on MAF Frequency Table 
    GXP Level Member Turbocharged400sbc's Avatar
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    yeah you have to lie to the pcm, alot in some cases.

    the TR runs 127lbhr injectors, however the IFR table is that of 60's, and thankfully we have a vintage range scalable AFC with 10khz and up at 50% tapering down to 80% at 4k and down.



    bee carefull when double checking yourself that you keep in mind that your only telling it about half the air...and half the fuel (or 2/3rds/3/4 etc wherever your range is needed, try not to shoot for too much headroom.leaving 50-75 gps (dhp) headroom is fine but much more than that and your killing resolution.

    what now nearly 4 years ago when we shredded the TR's 11th trans....we hit 27psi before he spun the tires at 106 mph and the inj on time/maf and rpm said we were making about 500hp....which threw me for a loop....till i remembered that i needed to multiply it by 2

    i dont know if we did or not....but we may have made close to 1000 at the crank before we shredded the ISS reluctor wheel with the slip n grip at 105
    ~James~ Psychotic Gearhead
    projects: 84 Cressida waGN~ 90 LN3 3800, equal length headers, T70, 89 700r4, misc parts,
    1994 Oldsmobile 442 (462ci-4wd-2 engines) L67/4t80e^2,
    00 Turbo Regal 608 fwhp 575ftlbs at 5500rpm, 98 WhippledRiv, 97 GTP
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