Mass air conversion results ?
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Mountain Pass
Joined: Apr 2017
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Mass air conversion results ?
Hey guys I’m having a hard time finding reviews and trucks that have done the mass air conversion from SD. I’m at a cross road with my truck right now. I’m holding back on spending money on the motor cause I’m leaning towards dropping a 3.9 Cummins in it for the mileage and power. But if a mass air conversion is really going to open it up I’ll got that way.
Last spring I put gt40p heads, headers,msd coil and rotor, edelbrock intake, and a torquey cam (can’t rmember exactly what one) and all that definitely helped for power and mileage. But I still want more. So is the mas air going to blow me away or is it just going to be a drop in the bucket?
Last spring I put gt40p heads, headers,msd coil and rotor, edelbrock intake, and a torquey cam (can’t rmember exactly what one) and all that definitely helped for power and mileage. But I still want more. So is the mas air going to blow me away or is it just going to be a drop in the bucket?
Fleet Mechanic
Joined: Aug 2015
Posts: 1,838
Likes: 367
From: Candy Mountain
At the end of the day, what you have built so far is a maximized version of the stock setup - which has advantages and limits.
A mass air conversion will get you close to maximizing your setup but it will not be earth shattering. Only other step in terms of management would be a custom tune.
I would look into deeper gears, and then if not satisfied look at a stroker kit before I contemplated a Cummins swap in an F150. Forced induction is a possibility as well...
What did you think of the Edelbrock 3881 and GT40 head combination?
A mass air conversion will get you close to maximizing your setup but it will not be earth shattering. Only other step in terms of management would be a custom tune.
I would look into deeper gears, and then if not satisfied look at a stroker kit before I contemplated a Cummins swap in an F150. Forced induction is a possibility as well...
What did you think of the Edelbrock 3881 and GT40 head combination?
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Mountain Pass
Joined: Apr 2017
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Ok thanks for the reply I should have mentioned that the cam technically isn’t compatible with SD. I’m planning on doing 4:10s this summer.
I put the heads cam and headers in at the same time and there was more power for sure but I wasn’t happy with it. So bought the intake a few weeks later. The intake was a game changer. If I had to do it again I probably wouldn’t have done the cam and just did heads intake and headers. The intake made power from idle and all the way into higher rpms. And it’s nice that I can take off the passenger side valve cover with it still on
I put the heads cam and headers in at the same time and there was more power for sure but I wasn’t happy with it. So bought the intake a few weeks later. The intake was a game changer. If I had to do it again I probably wouldn’t have done the cam and just did heads intake and headers. The intake made power from idle and all the way into higher rpms. And it’s nice that I can take off the passenger side valve cover with it still on
Laughing Gas
Joined: Oct 2014
Posts: 949
Likes: 187
From: Carnation, Wah
If I had to do it again I probably wouldn’t have done the cam and just did heads intake and headers.
I too am interested in the answer to this question, as standard internet lore says that the
speed density system really doesn't respond as well to breathing mods like you've done.
Especially a cam with some overlap.
t
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
Yeah the stock 5.8 intake is restrictive even with stock heads. Your motor would run better overall with a MAF conversion but don't expect any MPG gains.. it could even end up using more gas as the SD system is probably lean in spots now.
Laughing Gas
Joined: Dec 2005
Posts: 904
Likes: 115
From: Laurel, MS
Isn't it possible that he could gain MPG after a MAF conversion due to using sequential injector firing instead of batch injector firing?
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Mountain Pass
Joined: Apr 2017
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I Feel like it would help out with mpg’s as well but I don’t know for sure. When I got the truck it was only getting about 550km out of both tanks. Now it’s nearly 800km
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Lead Driver
Joined: May 2011
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Don't do the swap for mpg gains, you'll be sorely disappointed.
Now, the swap and a *good tune* would probably yield an improvement, but again, you've already made the setup so much more efficient over stock that what you've done already *is* the bulk of the improvement.
Now, the swap and a *good tune* would probably yield an improvement, but again, you've already made the setup so much more efficient over stock that what you've done already *is* the bulk of the improvement.
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
No. The batch fired SD system generally runs leaner overall so there won't be any fuel consumption improvements form MAF itself.
Lead Driver
Joined: Jan 2003
Posts: 9,893
Likes: 12
From: Ohio
The 351 was always a gas hog in these trucks. With your improvements what kind of mileage are you getting? Town/Highway?
With my 302 in my other '95, 3.31 gears it would get 19-20 mpg on the highway, flat road, 65 mph cruising. My current '95 only gets 17~ with 3.08 gears.
With my 302 in my other '95, 3.31 gears it would get 19-20 mpg on the highway, flat road, 65 mph cruising. My current '95 only gets 17~ with 3.08 gears.
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