how to get 300hp withn speed density
- Thread starter stangguy87
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302fordracer
New Member
if it is even possible I would say I highly do not suggest the attempt...switching to MAF isn't very expensive, and there was a good reason ford did it...When you mod a speed density car it changes the amount of air coming into the engine at every rpm and the computer relies on set value of air density to know how much fuel to add...modding a speed density car can cause it to run like total crap man...I was only putting down 244/292 at the wheels right after my swap to MAF and right before the swap with all the same parts...the car stumbled and jerked around while accelerating...the computer just didn't know how much fuel the engine needed...
poneypower89
Now everyone in the world will know I wanna bang t
didnt boosted joe lay down over 300hp on the dyno with his speed density car and a supercharger 
Of course, I would NOT ATTEMPT ANYTHING that man did...
unless you like lots of problems and wheels flying off... that sorta stuff.
Of course, I would NOT ATTEMPT ANYTHING that man did...
unless you like lots of problems and wheels flying off... that sorta stuff.
302fordracer
New Member
I am not saying it isn't possible...I just thought I should share my experience and warn that you may have trouble attempting such a thing..I am sure it could be done with a chip and a tune to tell the computer the updated air density numbers...I am just saying it isn't all that expensive or difficult to do, to switch to MAF...and the benefits are great...there as I said is a good reason why ford did the upgrade...
I don't see what the big deal is. I'm still running speed density even though i've had a mass air conversion now for over 4 years. I just don't feel there is a need to yet. You can still do all the other mods and there are even SD-friendly cams.
So a good set of heads, intake, tb and all the supporting bolt ons can still take you over 300HP.
So a good set of heads, intake, tb and all the supporting bolt ons can still take you over 300HP.
795.0pacecar
lover of pudgy polygamists
I was making 260 rwhp with speed density and the car ran fine, it didn't like to idle very well, but other than that it ran like a raped ape. I converted to mass air to improve my idle quality, but I think I also gained some power throughout the powerband with mass air.
The pro's of a MAF system is it helps "adapt" by adjusting fuel/spark according to how much air it measures going into th engine. Speed/density takes engine speed, along with the MAP reading, and adjusts fuel from there. The TPS "prepares" in both system and the final adjustments are done through the 02 sensors. If you reduce vacuum, or anything on a speed density system, it will not run right.
A con of the MAF is that vacuum leaks, turbulance, and a host of other factors can influence the readings. Many vehicles do not have MAF sensors, and do just fine without them. If you had an aftermarket computer, you could get rid of one or more sensors. I know people who run no O2's (because they run a lot of race gas) and those who run no MAF as well, they have thier car's dynotuned though and there are some setbacks, such as it has many of the same characteristics as a carbed car, but for the most part, it makes things more simple.
A con of the MAF is that vacuum leaks, turbulance, and a host of other factors can influence the readings. Many vehicles do not have MAF sensors, and do just fine without them. If you had an aftermarket computer, you could get rid of one or more sensors. I know people who run no O2's (because they run a lot of race gas) and those who run no MAF as well, they have thier car's dynotuned though and there are some setbacks, such as it has many of the same characteristics as a carbed car, but for the most part, it makes things more simple.
troyGT03
New Member
more than that can be done with sd. my current setup on my saleen is a fresh 306 with gt-40 aluminum heads and gt-40 intake with a novi 1000 pulleyed for 6lbs. 300hp is no problem. i havent put it on the dyno yet but the 300 mark is way low for my combo... i will post some new pics later
25thmustang
Mustang Master
My brothers 86 right now is SD, and with my dads GT40P motor it put down 292 to the wheels before. It is the same motor and was running fine. We have since switched to 19 lb injectors (for emissions) so it is probably in the high 280 range for power!
troyGT03
New Member
yes sd loves nitrous. i had many sd cars with nitrous. my setup was kind of a project for me to see how far i could go with sd. does it run like a raped ape...absoutely. driveability problems...none. would it make more hp with a maf conversion...sure. i am at the limit of sd and have to upgrade. it runs awesome and i have no problems.
Roland69
Sergeant Tangnet
302fordracer
New Member
All you people had success with this eh? I wonder what can be different about my car...maybe it was the e-cam? I don't quite know...all I can say is mine lacked power and stumbled all over the place with my mods and speed density...threw a MAF sensor on there and all was well...
795.0pacecar
lover of pudgy polygamists
It is MORE than possible to run 300 HP with SD. If there weren't such a lack of support for the Ford SD computers and the expense of running an aftermarket SD computer, I'd STILL be running SD.
My old engine combo (stock 86 upper and lower end) ran 317 ft/lbs and 375 tq (roughly) at the wheels with a 2.2L KB and 9 lbs of boost.
There are still a few places that have the software/hardware to electronically tune Ford SD comuters but they're getting harder and harder to find.
I imagine that a custom grind SD friendly cam and a good set of heads with my KB could have put me well into block splitting territory. Alas... I went with a DART block and lots of goodies so a MAF conversion was the best bang-for-the-buck option under those circumstances.
I've always wanted to do a high compression SD friendly and streetable setup for an 85 or 86. One day, when I have nothing but time and money......
My old engine combo (stock 86 upper and lower end) ran 317 ft/lbs and 375 tq (roughly) at the wheels with a 2.2L KB and 9 lbs of boost.
There are still a few places that have the software/hardware to electronically tune Ford SD comuters but they're getting harder and harder to find.
I imagine that a custom grind SD friendly cam and a good set of heads with my KB could have put me well into block splitting territory. Alas... I went with a DART block and lots of goodies so a MAF conversion was the best bang-for-the-buck option under those circumstances.
I've always wanted to do a high compression SD friendly and streetable setup for an 85 or 86. One day, when I have nothing but time and money......
troyGT03
New Member
survey says.......noooooo.....please try a sd friendly cam. all of the fms cams have too much lift/duration for sd. it will run but idle and driveability probs will be huge.
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