LS1Edit warning about maxing the maf
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From: Richmond, VA Where fast cars, well......are hard to come by.
LS1Edit warning about maxing the maf I found out tonight, almost at the expense of my engine, that if you have any suspicion that you will come close to the maf high fail limit (about 5psi will do it) that is listed in the engine diagnostics screen, then you need to raise that number. Once it hits that number it stops reading the maf, and I assume goes to speed density which is a no no with our map sensor. If you set the fail freq higher, it will still max the flow reading according to the maf table, but will continue to read that number. When I hit the limit (11250 in 98, 12000 for others I believe) the flow rate went to 0 g/s, while pushing about 9 psi. I just happened to let off the gas at that exact time, so it spiked 4* kr and then 0. Since I have been woring with MIGHTYMOUSE on his car, which maxed the maf before mine did, I never saw this problem because he had raised his fail number. I always figured the code just told you that it was over the reading limit, not that it was cutting the maf off. Just some fyi, maybe I should buy a lotto ticket. 
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Re: LS1Edit warning about maxing the maf Now what is the solution to having the maf read more?? also what table in ls1edit is this in?
Would this effect nitrous users as well who are spraying 200+ shots of dry nitrous kits in, and possibly maxing out the maf?
Would this effect nitrous users as well who are spraying 200+ shots of dry nitrous kits in, and possibly maxing out the maf?
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Re: LS1Edit warning about maxing the maf I had flowed up to the 11250 where it flatlined, but for some reason had the fail set at 11500. I was just barely nudging the 11500 before I guess, so briefly I never saw it since atap just wasn't fast enough to catch it, but I got the code.
c4, You'll have to do a search on higher reading maf solutions, there have been quite a few posts in this forum and the pcm forum. Setting the fail freq higher will keep it working, it just won't read anything over 439.2 g/s for 98 pcms, the newer ones go to 12000 Hz, but I don't know the g/s. The fail freq is under diagnostics, where you disable codes and work with misfire detection. I'd think it would affect n2o users, since you don't have 'plain air' coming in. The ve table would probably be closer for n2o, but would need adjustment. But for 200, I think I'd look at a wet or even better, a 2 stage. The more you go wet, the less you'll have to worry about maxing out the maf. I think on my old tnt kit I hit the limit on the 100 jets once or twice.
c4, You'll have to do a search on higher reading maf solutions, there have been quite a few posts in this forum and the pcm forum. Setting the fail freq higher will keep it working, it just won't read anything over 439.2 g/s for 98 pcms, the newer ones go to 12000 Hz, but I don't know the g/s. The fail freq is under diagnostics, where you disable codes and work with misfire detection. I'd think it would affect n2o users, since you don't have 'plain air' coming in. The ve table would probably be closer for n2o, but would need adjustment. But for 200, I think I'd look at a wet or even better, a 2 stage.
The more you go wet, the less you'll have to worry about maxing out the maf. I think on my old tnt kit I hit the limit on the 100 jets once or twice. 
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Re: LS1Edit warning about maxing the maf Mine max's out my extended MAF by the mid 5000 RPMs and maxed out the stock MAF in the high 4000's.
My Hi Fail Limit is set to like 14336 or someting similar... it's like that in the stock tune. I've never gotten higher than the 12000's.
My Hi Fail Limit is set to like 14336 or someting similar... it's like that in the stock tune. I've never gotten higher than the 12000's.
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Re: LS1Edit warning about maxing the maf
Has anyone considered running two parallel MAFs and halving the readings.But I was considering running twin MAFs with twin electronic throttlebodies.
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Re: LS1Edit warning about maxing the maf What I was considering was a intercooled Magnacharger intake with heat exchanger mounting a Autorotor twinscrew supercharger with a custom twin throttlebody intake coming from behind the supercharger like the Magnacharger with twin electronic throttlebodies facing forward mounting twin MAFs with twin airboxes pulleyed for 22lb of boost.Feeding a large displacement engine.
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Re: LS1Edit warning about maxing the maf whitt1 - I hate to sidetrack this thread but, what blower(model) were you thinking of to flow that much air? I don't know if there is one capable of producing the power you're talking about. Sounds like a cool project though.
If someone came out with a reliable setup that used two MAFs it seems that the stock computer could support ~1400hp with the appropriate tweaks.
I think somebody before was talking about using 2 MAFs and averaging their output. Then it seems you could just cut the injector size in half in the computer.
Could it be that easy??
I know it can't.
John
If someone came out with a reliable setup that used two MAFs it seems that the stock computer could support ~1400hp with the appropriate tweaks.
I think somebody before was talking about using 2 MAFs and averaging their output. Then it seems you could just cut the injector size in half in the computer.
Could it be that easy??
I know it can't.John
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Re: LS1Edit warning about maxing the maf Here is that post I was talking about.
https://ls1tech.com/threads/showflat...t=all&vc=1
ChrisB is the one that was talking about the dual MAF setup. That would be so easy to make work(if I wasn't electrically handicapped
) and the stock computer could read almost 1400hp with some recal'd MAFs.
John
https://ls1tech.com/threads/showflat...t=all&vc=1
ChrisB is the one that was talking about the dual MAF setup. That would be so easy to make work(if I wasn't electrically handicapped
) and the stock computer could read almost 1400hp with some recal'd MAFs. John
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From: memphis tn
Re: LS1Edit warning about maxing the maf Whipple offers a 3.3 liter twinscrew supercharger that could easily make that kind of power,with twin throttlebodies you could easily flow 2000+cfm and the boost would be almost instant.You could make over 1000hp without reving past 6000rpm.The 3.3 liter could probably flow over 3000 cfm but I doubt you would need that much.
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Re: LS1Edit warning about maxing the maf I've seen the specs and performance charts for that 3.3L and I think it maxes out around 1300CFM. That would be around 900 flywheel hp.
Since your doing two of everything else, why not put two smaller 2.3L whipples in there?
Since your doing two of everything else, why not put two smaller 2.3L whipples in there?
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Re: LS1Edit warning about maxing the maf 1300CFM at what boost pressure?I'm talking 22psi I doubt the chart would read that high.One large blower would make packaging easier.Autorotor probably has a larger blower for big diesel engines.
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Re: LS1Edit warning about maxing the maf Whitt - 22psi doesn't really mean anything. If you had a 346 with 22psi it might only be 14psi on a big motor. At max rpm the 3.3L looks like it only will flow around 1300CFM. That's the number that counts. On a 408ci heads/cam/exhaust setup 14psi would probably max the 3.3L out, 22psi on that setup would probably be almost 1200hp and the 3.3L doesn't look like it's physically capable of flowing that much air.
I'm just looking at a chart though. In reality you might be able to overspin it a bit and get those numbers.
Here is the chart for the 3.3L blower.
http://www.rotor.se/lysholm/images/diagram/3300ax.gif
The bottom number which is in m^3/min translates to 1200+ CFM at it's max of 35m^3/min.
I'm just looking at a chart though. In reality you might be able to overspin it a bit and get those numbers.
Here is the chart for the 3.3L blower.
http://www.rotor.se/lysholm/images/diagram/3300ax.gif
The bottom number which is in m^3/min translates to 1200+ CFM at it's max of 35m^3/min.
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Re: LS1Edit warning about maxing the maf
Whipples Quadrotor setup will support 1600hp I guess you could just run two of everything.How big of injectors would the monster need?
For 1600HP you'd need injectors somewhere around 120lbs/hr @ 43.5psi.
This thread has now been officially hijacked. :p Sorry
John
Re: LS1Edit warning about maxing the maf My Aussie TSI controller clamps the MAF so it tunes WOT off the MAP sensor.
Harlan has a custom MAF setup that was a bit pricey, I'd like to see someone bring a MAF solution to the market that was not as pricey.
Harlan has a custom MAF setup that was a bit pricey, I'd like to see someone bring a MAF solution to the market that was not as pricey.
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Re: LS1Edit warning about maxing the maf I was at a Pontiac dealer getting some warranty work on a trim piece. I started talking to one of the mechanics and he showed me a customers TA (with nitrous) that he had put the 6.0 liter truck MAF sensor on. He said it was a larger diameter. Maybe it could read higher, I don't know. He said he had to rewire the plug because it was not a direct plug-in. I max out my MAF at 5000 rpm. Does anybody know if this sensor would read higher or is the limitation in the computer?
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Re: LS1Edit warning about maxing the maf The limitation is in the computer. 
The truck MAF is physically bigger than the LS1 MAF so some people may run it to have less intake restriction. It also has an integrated IAT sensor thus the reason for a different plug.
The truck MAF is physically bigger than the LS1 MAF so some people may run it to have less intake restriction. It also has an integrated IAT sensor thus the reason for a different plug.