qwik86iroc

Has anyone used the Granatelli Adjustable MAF sensor? It claims 47% more airflow. I was wondering if this product works and how reliable it is. I figure for about $30 more than an OEM replacement I would rather buy a performance product. The rebuilt ones just don't seem to last, and they aren't cheap either. Any info would be helpful. Thanks.

DJP87Z28

Waste of money, do a search for test results. Buy a Wells Maf for more air flow.

Dave87IROCZ

I just installed the Granatelli on my car after I broke my old maf doing the tpis mod. Expensive mistake. My car idles better than ever and I noticed alot more power and better throtle response. I havent adjusted it yet to dial in proper a/f so Im expecting even better performance. I checked on the wells through carquest they wanted $280 so I decided to go with the Granatelli for $329 from summit.

Vader

Ouch! That's a sizable increase. The Wells unit used to be priced at around $170.

ThirdGenFire

I thought about the Granatelli one as well but I needed the MAF now so I bought a rebuil one. Oh well maybe nex time.

firebirdjones

Yep Vader, the price has jumped on the wells unit or other stock replacements, I recently checked into this myself when I thought I was having maf problems. I thought for that kind of money I may as well just go for the granatelli and hope for a slight performance increase. Seems like the LS1 guys love those granatelli's but the general concensus over here on the TPI board is they are junk. That is what I have found anyway, still not sure myself since opinions seem to be 50/50 on the subject, since mine just turned out to be a relay and I didn't need the MAF afterall, oh well. Maybe next time I will experiment and see for myself. Larry.

Dave87IROCZ

Yeah talk about steep prices. I went to Murrays and they wanted $480 for a stock one and $6oo for the Bosch.

DJP87Z28

After reading these Posts, I thought why not check the Price.
I went to World Dicounts web site or(1-800-288-6728) where I last bought my WELLS Su-145 MAF and guess what. They are available at $161.85 +S/H $16.81 (the shipping went up) for a total of $178.03. Just in case anyone is interested.

Rob Wade

I've never heard of this Wells maf before. Is it a higher flowing than stock piece? Adjustable?

Vader

The replacement Wells SU-145 is a new part, not remanufactured. Very much like the later Hitachi, LT1, and LS1 units, it uses a thick-film transducer on a single, flat circuit card instead of the sensitive hot-wire element placed in a sampling tube inside the housing that can fail so easily. Because of the reduced switching current required since there is no wire to heat up, it also has no internal heat sink fins. In place of the round wire screens that occupy each end of the stock Bosch sensor housing, there is a single flat metal matrix at the inlet end only to delaminate air flow for a more accurate reading. The I.D. of the sensor body is larger, and the cross-sectional are of the sensor (minus the internals) is a lot larger.

Although the two are not scaled exactly the same, this may demonstrate the differences:

Rob Wade

So now I have no use for a burn off relay and a maf power relay, so how does it get wired in? Is it a straight swap? I believe my stock bosch is a 4 pin?

Vader

It's a direct plug-in replacement through the same five-pin connector used by the stock Bosch MAF sensor. The power is still provided via the MAF power relay. The sensor has a dummy load and resistor/diode network that provides a signal to the ECM when the MAF power relay is energized. This "fools" the ECM into thinking a successful burn off cycle has been completed, even though it isn't necessary on this MAF. As a result, the ECM never stores a fault code.

All that's necessary is to clamp it in place of the original and plug it in.

Rob Wade

Very nice. Thanks for the info. I was wondering how to try and get around the restriction of the maf. One more thing off the list for this winter's engine project. Thanks again.

big black bird

onething to look out for when installing the wells unit is to not overtightenthe clamp or it will break the plastic material that they have used is more softer than oem it aint as sturdy as the bosch unit

Vader

While you may get a larger hole, and better WOT flow with any larger MAF, the problem of MAF scaling still exists. Regardless of the MAF sensor that is plugged in, the ECM firmware can still only recognize a maximum of 255g/S intake flow in closed loop mode. Once you go to WOT, the ECM goes open loop and all tuning is done with programming and fuel pressure.

mystikkal_69

iTrader: (2)

has anyone ordered a well su-145 recently? i asked world discounts about the product. they say that the wells unit now being sold are reman bosch units. ie original style. anyone care to chime in?

firebirdjones

Yep I tried to find one a few months back with no success, all I could find were reman bosch units,,,,,YUK .... and they were nearly the price of a brand new Granatelli. That is the whole reason why I brought up the Granatelli subject a couple months back since I was considering one and the LS1 guys love them. General consensus here is they are junk but I am not so sure. I think that is mainly beacuse most of the guys here seem to lean towards map sensors instead. Granatelli now has an application for our cars that are a direct fit with the flat circuit card and no heated wires to deal with, sounds good to me. Just have to cough up the dough to buy it. I think this is the route I will go reguardless of the price,,,Larry.

mystikkal_69

iTrader: (2)

go to advance auto parts website and type in the search field, 49-1018. this is the part # for the microtech thick film MAF(like the previous Wells SU145).it is for 86-89 305-350 tpi V8's(165 based systems). it also has a lifetime warranty. i'm going to order it next month and see how good it is. funds are low this month.

Vader

Try a recent search for "Wells" and "MAF". There is some availability information about them.

cdartz

I'm running the Micro-Tech unit in my 87. It works great!!!!!!!

firebirdjosh

iTrader: (1)

Speed Density conversion... I just finished and I'm pleased with the results.

Rob Wade

I debated about that choice, but in the end its more expensive than the granetelli adjustable maf. I still don't know what combination I'm going to build so I'm just seeing what options are out there.

87zjeff

iTrader: (4)

i tried a microtech unit and my car ran like garbage. threw a code within seconds of starting. i had the dubious pleasure of taking it back to the manufacturing plant and showing them proof when they didn't believe me. i got my refund even though they said electronics weren't refundable.

firebirdjosh

iTrader: (1)

SD is by far cheaper, I'm not going to argue it in this post but doing a search will show alot of results.

Kennerz

my well SU-145 started causing my car to stall unexpectedly at any time/ any speed,which was very scary! ( after rougly 1 1/2 years of trouble free service) had to do full diagnostics to narrow it down to the maf. ( major PITA)

anyhow got a replacement from world auto, they were very good about letting me return the old wells ( took a total of 4 weeks, not enirely their fualt, they did give good service, just their policy took time)

Anyhow my replacement SU-145 is the bosch style, not the wafer filament style they had previously sold me.

Definetly not as much power on my combo, with a screened bosch vs. the stock wells SU-145 wafer style, was very noticeable.

until I did the unthinkable to the bosch and removed both maf screens, now power is back close to where it was or better and the car runs well - there goes my core...

irocbadboy

i put a microtech on my iroc and ,my car (engine cold),check engine light come on,i verified the code,it was a code of oxygen sensor run rich,I adjusted my maf(less in advance) and my iroc run great with the better performance,i love my maf.

Bobby_80s

iTrader: (2)

so what would you guys say I should buy for an adjustable MAF? everyone has mentiuoned at least 3-4 different types buy which one will really give you ur money's worth and is a direct swap into the intake clamp setup and wire plug in working with stock maf burnoff and power relays?

firebirdjones

I am pretty sure that the aftermarket adjustable MAF still uses your factory connector, but the burnoff mechanism is no longer there and the burnoff relays are no longer needed. No mods to the car are necessary for that stuff as far as I remember. I believe it was Granatelli. Larry.