Skip to main content ↑ ↓
Topic: Speed density VS. MAF (Read 952 times) previous topic - next topic

Speed density VS. MAF

I am going to be building a motor for my car within the next year. It has the factory style dual exhaust but larger 2.5" into daul 2.25". It also has the HO upper intake, TB, and cold air intake. When I build the motor Im going to reuse the stock cougar roller cam with 1.7 roller rockers and GT40 cylinder heads. Im going to bore it .030 and use flat top pistons. My question is with this set up will I need to run MAF. If I do I might as well run a better cam but Im trying to stay away from spending the extra money on MAF.

Im sorry if this question has been done to death but the reason I ask is to see if the speed density will work with my particular set up.
88 Cougar LS 5.0 .030 over, ported E7s with GT40 valves & trickflow springs, Proform roller rockers, HO cam, removed air silencer, K&N filter, smog pump delete, 2.25" dual flowmasters, Pacestter H-pipe & headers, HO computer, 65mm TB, Explorer intake, 19# injecters, 3.45s, rebuilt posi, and TCI shift kit.

Speed density VS. MAF

Reply #1 –
you don't HAVE to go MAF, but i would recommend it. i'm not really sure if that setup will run well either way tbh. i'm sure someone will chime n that knows more than i.
:cougarsmily:5.0 HO, E303 cam, Exploder/Cobra intake, smog pump delete, Ford Taurus electric fan, MAF conversion, BBK headers, MAC 2.5" off-road exhaust w/x-pipe, AOD w/shift kit, 8.8 Trac-Loc rear w/disc brakes, 5-lug conversion w/'98 Mustang GT 17" wheels, Mach 1 springs:cougarsmily:

Speed density VS. MAF

Reply #2 –
From what I've read, speed density will work unless you do something to change vacuum characteristics. That being said, I'd stay away from using the stock Cougar speed density computer. If you're going to replace the pistons go with ones that have valve reliefs. Ditch the Cougar cam (SO cams really, really suck) and go with a stock HO cam, get some 19-pound injectors, then get a DA1 speed density computer from an 87-88 Mustang (it'll plug right into your Cougar's harness).
2015 Mustang GT Premium - 5.0, 6-speed, Guard Green - too much awesome for one car

1988 5.0 Thunderbird :birdsmily: SOLD SEPT 11 2010: TC front clip/hood ♣ Body & paint completed Oct 2007 ♣ 3.55 TC rear end and front brakes ♣ TC interior ♣ CHE rear control arms (adjustable lowers) ♣ 2001 Bullitt springs ♣ Energy suspension poly busings ♣ Kenne Brown subframe connectors ♣ CWE engine mounts ♣ Thundercat sequential turn signals ♣ Explorer overhead console (temp/compass display) ♣ 2.25" off-road dual exhaust ♣ T-5 transmission swap completed Jan 2009 ♣

Speed density VS. MAF

Reply #3 –
EDIT: yeah what Thunder Chicken said. :giggle:

It'll probably be fine on SD, but you're not gonna be able to keep the stock tune because of the 14lb injectors. For GT-40 heads you need at least 19s. So you could probably put in a Mustang cam and 87-88 Mustang ECM and keep speed density that way.
Matt
1984 Thunderbird - 89 302 HO, GT40 heads w/ Trick Flow springs, E303 cam, Edelbrock Performer 289 intake and 600 cfm 4bbl, Mustang headers, Jegs o/r H pipe, Dynomax lers, Mustang AOD and shifter, Mustang 8.8 w/ 3.73s, 3G alternator, Mustang front and rear sway bars, KYB 87-88 Turbo Coupe shocks and struts, and 11" front brakes.

1988 Mustang GT - GT40 heads, Explorer intake, 70mm throttle body, 70mm MAF, Crane 1.7 rrs, E303 cam, Kirban Kwik shifter w/ Pro 5.0 deluxe handle, aluminum clutch quadrant and firewall adjuster, o/r h pipe, Dynomax lers, 3G alternator, aluminum radiator, and 3.27 gears.
 
1986 Cougar 5.0, 1989 Mark VII LSC 5 speed, 1980 Mercury Zephyr 4 door (sold)

Speed density VS. MAF

Reply #4 –
Using your stock cougar 5.0SO cam is not a good idea.
It's a terrible cam that will drop out early in the rpm even with 1.7s and with those heads forget it.
My advice get yourself an HO cam,19lb injectors and an HO eec and use the 1.7s on that.
It will work fine with the SO pistons and will give you alot more power throughout the band and be a correct HO.
If your interested i have the injectors,SD eec and the HO cam all in perfect working order.
Yes the cam will work with you lifters.

Speed density VS. MAF

Reply #5 –
Quote from: Thunder Chicken;254772
From what I've read, speed density will work unless you do something to change vacuum characteristics. That being said, I'd stay away from using the stock Cougar speed density computer. If you're going to replace the pistons go with ones that have valve reliefs. Ditch the Cougar cam (SO cams really, really suck) and go with a stock HO cam, get some 19-pound injectors, then get a DA1 speed density computer from an 87-88 Mustang (it'll plug right into your Cougar's harness).


Thank you. I will be getting KB two valve relief flat tops. As for the HO cam if I can find one at the shop or junkyard it will a good option. The DA1 and 19-pound injectors are also a good idea. I will most likely go with them I didnt know there was a difference in the mustang and cougar.
88 Cougar LS 5.0 .030 over, ported E7s with GT40 valves & trickflow springs, Proform roller rockers, HO cam, removed air silencer, K&N filter, smog pump delete, 2.25" dual flowmasters, Pacestter H-pipe & headers, HO computer, 65mm TB, Explorer intake, 19# injecters, 3.45s, rebuilt posi, and TCI shift kit.
 

Speed density VS. MAF

Reply #6 –
Quote from: dominator;254774
Using your stock cougar 5.0SO cam is not a good idea.
It's a terrible cam that will drop out early in the rpm even with 1.7s and with those heads forget it.
My advice get yourself an HO cam,19lb injectors and an HO eec and use the 1.7s on that.
It will work fine with the SO pistons and will give you alot more power throughout the band and be a correct HO.
If your interested i have the injectors,SD eec and the HO cam all in perfect working order.
Yes the cam will work with you lifters.


Yes I am very interested. I would like to get every thing I need in one shoot insted of searching all over the place. Can you PM me an price.
88 Cougar LS 5.0 .030 over, ported E7s with GT40 valves & trickflow springs, Proform roller rockers, HO cam, removed air silencer, K&N filter, smog pump delete, 2.25" dual flowmasters, Pacestter H-pipe & headers, HO computer, 65mm TB, Explorer intake, 19# injecters, 3.45s, rebuilt posi, and TCI shift kit.