Has anyone tried a Granatelli Motorsports mass airflow sensor? Supposedly flows 45% more air than stock with a gain of 10 to 15 hp. Is it worth $340.00 is what I'm really asking? 2001 SOHC 4.0L. :confused:

Check a little bit further down the board. I put up a post about Granatelli's being on sale at truckperformance.com for $269. A little bit better than $340.

I still wouldn't buy one of those things though. I'm going to go with a 75mm Pro-M for $200. Actually, the guys over on the S-series board have found out that the Granatelli MAF's are actually costing them power. Please don't ask me anything about their trucks or their setup. I have no clue. That is just what a friend told me.

Also, if you're set on spending that much money for a MAF, check out these, Vanir Tech (http://www.vanirtech.com). A lot of people like these for their adjustablity.

One other thing.... Is the rest of your truck stock? I HIGHLY doubt you'll see anything close to 10-15hp gain on a stock truck just by swapping out MAF's. Didn't mean to burst your bubble if I did.

Thanks for the info. I some mods already, Superchip, Gibson Cat-Back, Custom Air Box Modification. Thinking of a larger trottle body and high flow mass sensor.

The new MAF and Throttle Body will definantly help your HP and throttle response but companys always claim certain HP increases that are not realistic. I say those would be your next mods unless you go with an electric fan.

Later

Matt

Sweet man, I wasn't sure if you were stock or not. You sound like you've got about the same mods as I. Upgrading your TB and MAF is probably a good next step. Also remember though, a MAF gets most of its power from making the spark curve more aggressive, the same as your Superchip does [right Sven? :)]. To make sure everything is going to coorperate with each other, you need to plan on getting your chip re-programmed for your mods when you switch MAFs. You also might look into switching out your stock engine driven fan for some electric ones. I did that to mine this past weekend and it's definitely, as some would say, a 'seat of your pants' mod. I've also swapped out my stock cats for a Bassani unit. That combined with my fans have really freed up some power.

Anyways, sorry to drag on and on. Let us know how it goes!!

Any suggestions on what size trottle body since stock is 65mm and suggestions on size of mass sensor? Got any links to some suppliers?
Far as electric fans, It's been a thought. Installation any problem?
Thanks, Jason

Jason
Not too sure on TB size. Are you sure that 65mm is the STOCK size? Seems pretty big. you could be right though. I'm not too sure on that one.

As for the fan install, hahahaha. Check this out...Need help removing my stock fan... (http://www.rangerforum.com/showthread.php?s=&threadid=501)

I have been read the long list of problems while you were typing my reply. Now that you know my stock trottle body size, any ideas? Thinking about going with the electric fans. This may sound Dumb, but do I us the stock thermostat sensor for the wiring installation? Thanks, Jason

The stock TB on a SOHC engine is 65mm, vs the 55-57mm on the OHV engines. I remember Sven saying one time the TB was plenty big enough. You might try a larger MAF, but I doubt a bigger TB would do you much good. You're still pulling strong above 5500 rpm aren't you?

Yes, It's pulling hard in the upper RPM range. Think I may Shy away from touching the trottle body and the mass. Looking into the electric fan option now.
Any word on a supercharger yet for this motor? I had heard that they are having problems adapting a supercharger to the 2001 SOHC 4.0L because of the compression ratio of 9.5. Have you heard this? Thanks, Jason

Hadn't heard that Jason. That's the first time I've heard the compression ration was 9.5-1, probably would have to drop in some flat tops or something to run any kind of significant boost. I've been thinking about an electric fan too, mine sure gets noisy when you drive it in traffic a while and the fan clutch locks up. Does yours still have the timing chain noise? Getting any worse? I found this a while ago. I wonder why just "some". Good thing is, it's apparently the primary chain and not the two secondary ones. Primary should be easier to fix.

Service Bulletin Number: 14823
Bulletin Sequence Number: 192
Date of Bulletin: 0104
NHTSA Item Number: SB619317
Make: FORD TRUCK
Model: RANGER
Year: 2001
Component: ENGINE
Summary: SOME VEHICLES EQUIPPED WITH THE 4.0 SOHC ENGINE MAY EXHIBIT A PRIMARY CHAIN RATTLE NOISE BETWEEN 2000 - 3000 RPM (SOMETIMES DESCRIBED AS A SPARK KNOCK-TYPE NOISE). *TT

Yes, mine still has the chain noise. I have about 12,000 miles on it now. I have seen alot of posts with people saying that after the motor comes up to full operational temp that it goes away. Not in my case, it may be a little quiter but it's always there. I wish Ford would find a way to fix this problem. Later, Jason
:drunk:

That's odd Jason. Mine goes away completely after it's warmed up. It takes a little longer than just the temp gauge getting to its normal position, but it does go away. If the truck sits for more than an hour, it's right back again though. I don't think it's as bad now as it was back in the winter. And as long as I stay below 2500 rpm, it never shows up. Either that, or keep it above 3000.