Problems with SLP 85mm MAF?
Problems with SLP 85mm MAF? I was just wondering if anybody has had any problems with or heard of any problems with the SLP 85 mm MAF? I just installed mine last week and when I was at the track I noticed my times were consistenly down .300 to .400 from the last time I was at the track. Now it was alittle hotter than last time but would that really equate to such a drop in my times?
On The Tree
Joined: Oct 2002
Posts: 128
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From: Mission Viejo, CA
Re: Problems with SLP 85mm MAF? How does your trans shift with the slp maf? I've heard that the maf effects trans line pressure so it's not a good idea to have a aftermarket one on a auto.
On The Tree
Joined: Nov 2001
Posts: 115
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From: bay area
Re: Problems with SLP 85mm MAF? you should go back to the stock maf. The after market maf's have frequencies that go outside what the pcm can understand so the car doesnt run right. soon as you change it, reset the pcm and let it relearn.
TECH Addict
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From: sojourning....looking for my city whose builder and maker is God.
Re: Problems with SLP 85mm MAF? Don’t make the mistake of blaming all the loss on your MAF. The weather can make a BIG difference in your ET at the track. I have been a weekly racer for a few years now and have been down the track more than hundred times. Every 10 degrees warmer can make my car run about .10 slower ETs.
If you know the date of your previous trip to the track, you can compare the weather conditions of the two days. Go to http://www.wunderground.com/ and type in the zip code of the track you race at. Scroll down towards the middle of the page and you will see where you can enter a date and get the weather conditions of that day.
BTW, I have the SLP 85mm MAF and I gained .15 in the 1/8 mile track. But I also have LS1Edit so I have it tuned in for it.
Hope this helps, Becky
If you know the date of your previous trip to the track, you can compare the weather conditions of the two days. Go to http://www.wunderground.com/ and type in the zip code of the track you race at. Scroll down towards the middle of the page and you will see where you can enter a date and get the weather conditions of that day.
BTW, I have the SLP 85mm MAF and I gained .15 in the 1/8 mile track. But I also have LS1Edit so I have it tuned in for it.
Hope this helps, Becky
On The Tree
Joined: Jun 2003
Posts: 150
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Re: Problems with SLP 85mm MAF? First of all, your MAF has nothing to do with your tansmission. I don't know what that guy was thinking. The SLP MAF gives you HP in 4 ways: It is bigger, so you get more air, it is smoother, so you get more air, it is plastic, so you get colder air, and it tricks the computer into leaning out your fuel/air mixture, which may or may not be cool. If you have a hypertech reprogramming or something similar, that will already lean out the fuel\air to the best ratio. If you get an aftermarket MAF that leans it out more, you will only get trouble. What you need is AutoTap or some other diagnostic software to tell you what is happening to your fuel\air ratio. I'm told that the effects of the SLP MAF get figured out by the computer in a few hundred miles anyway, so this problem might fix itself. You might want to check with Granetelli. They make MAFs that don't lean out your mixture, but you'll have to make it a special order, and they arn't cheap. The stock MAF may be your best bet.
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Re: Problems with SLP 85mm MAF? There are at least 4 85mm MAFs out there (if you
count both of the SLP variants as one). Z06, GMAF,
Pace and SLP (a worked-over truck MAF).
I have no problems with my SLP MAF ('02). Others
have different tales to tell. Any MAF that makes
your mixture lean, is bad news and you would have
to correct the side effects. One of which is low
demand signaling which makes the automatic
transmission soft-shifting when you need it to be
strong.
With Predator & SLP MAF I have put my WOT O2s
anywhere from 940mV to mid-800s. Certainly can go
lower, but who wants to go there? So we're not
talking any kind of lean bias here. On my near-
stock '02 there was no obvious difference from
the OEM MAF and that meant no tuning needed
(not to say the tweaking urge doesn't make you
go tune it anyway).
Totally different story from what you can hear
on ported MAFs, GMAF, etc. and I think '98-'00
SLP MAF may be more this way too.
If this business weren't all just a snake oil
sideshow the manufacturers would publish (or,
give you for the asking) decent frequency-flow
data or curves compared to stock and then the
consumer would have a clue what they're doing to
the car. But it's all just happy words that say
nothing, pretty much, at best. Buyer beware.
I'm happy as a pig with my used $85 SLP MAF.
Yeah, probably I'd be just as happy with stock.
Seen plenty of others spend more money and get
more headaches. Hell, you can get the headaches
for free with nothing but a Dremel tool and
some bad advice. Or, you can spend no money and
no time, and have no problems. But what fun would
that be?
count both of the SLP variants as one). Z06, GMAF,
Pace and SLP (a worked-over truck MAF).
I have no problems with my SLP MAF ('02). Others
have different tales to tell. Any MAF that makes
your mixture lean, is bad news and you would have
to correct the side effects. One of which is low
demand signaling which makes the automatic
transmission soft-shifting when you need it to be
strong.
With Predator & SLP MAF I have put my WOT O2s
anywhere from 940mV to mid-800s. Certainly can go
lower, but who wants to go there? So we're not
talking any kind of lean bias here. On my near-
stock '02 there was no obvious difference from
the OEM MAF and that meant no tuning needed
(not to say the tweaking urge doesn't make you
go tune it anyway).
Totally different story from what you can hear
on ported MAFs, GMAF, etc. and I think '98-'00
SLP MAF may be more this way too.
If this business weren't all just a snake oil
sideshow the manufacturers would publish (or,
give you for the asking) decent frequency-flow
data or curves compared to stock and then the
consumer would have a clue what they're doing to
the car. But it's all just happy words that say
nothing, pretty much, at best. Buyer beware.
I'm happy as a pig with my used $85 SLP MAF.
Yeah, probably I'd be just as happy with stock.
Seen plenty of others spend more money and get
more headaches. Hell, you can get the headaches
for free with nothing but a Dremel tool and
some bad advice. Or, you can spend no money and
no time, and have no problems. But what fun would
that be?
Re: Problems with SLP 85mm MAF? I've had no problems out of mine but I didn't pick up anything over a home ported stocker. It was a waste of my money.
I can swap them at the track and I don't see anything in MPH at all. Horse Pucky!!!!
Port your stocker and use the money that you would have spent to go toward tuning.
BTW, I think that looking at your MPH is a more consistant measure than your ET. Might be wrong though. Any different opinions?
I can swap them at the track and I don't see anything in MPH at all. Horse Pucky!!!!
Port your stocker and use the money that you would have spent to go toward tuning.
BTW, I think that looking at your MPH is a more consistant measure than your ET. Might be wrong though. Any different opinions?
Re: Problems with SLP 85mm MAF? Weatherman -
Your engine setup looks pretty much like mine.
Since you have(?) wideband O2 data, can you
line that up against engine O2 sensor volts
for me? I'd like to get an idea of what my
O2 readings really mean and this looks like
a good calibration candidate.
If you had charts or tabular data that line
these up I'd love to get ahold of that info.
Your engine setup looks pretty much like mine.
Since you have(?) wideband O2 data, can you
line that up against engine O2 sensor volts
for me? I'd like to get an idea of what my
O2 readings really mean and this looks like
a good calibration candidate.
If you had charts or tabular data that line
these up I'd love to get ahold of that info.
On The Tree
Joined: Nov 2001
Posts: 115
Likes: 0
From: bay area
Re: Problems with SLP 85mm MAF? your stock maf flows 750 cfm why would you change it.
plus the transmission is affected considering torque management runs the drivetrain and torque management takes readings from the maf
plus the transmission is affected considering torque management runs the drivetrain and torque management takes readings from the maf
Re: Problems with SLP 85mm MAF? according to gm hight tech the slp maf will intially net a loss in hp BUT after the computer learns in the sensor in you will see a gain even for a stock engine addtionally they went on to say that the maf will work fine with hpp3. From personal expirence i noticed a difference in exaust note and power after adding the maf. Although when i had a stock exaust i did have to remove my hpp3 tunning beacouse i was getting minor high rmp knock on the hottest days 95+ deg. after doing my slp y pipe and borla cayback i decided to add back the tunning and i could immedatlly tell a good difference. some do say a ported maf wan cause trans line pressure problems but i dont think the slp one will cause any problems cause one its not ported just larger and two its made to work with ls1 6.0L engines. I can personally say im happy running the slp\hypertech combo (using the 75% firmness increase on shifts option) and besides running too lean on a stock exause on the hottest days (which now appears to be solved) the two have given me no probples. finally according to slp and hypertech you may expirence high rmp detnoation when using their products in some climates (like i did for a while) if so thell refund the product BUt maddbost id say if your not getting any knockthen just run arround on it for like 1000 miles and break it in so to speak your not gonna get much if your stock but it will help down the road if you do a cam or headders (IMO)
