351c Turbo headers construction in its infancy

[floydamus]

if ya plan tp boost it alot you better change the block or your hard work will go up in flamesl. but that shit goign to be wiscked nasty. planning on doing bout the same with a 331 motor in my 93 mustang

[duplox]

I'm plannin to push 6-8psi on the street(95% of its life) and anywhere from 10-15psi on the track. 6 psi should give around 550hp, 15 closer to 800. The block will be filled within 1" of the deck with HardBlok, it should be able to hold up to 550hp. Much above 600 it gets shaky. Some have made cleveland blocks live over 1000hp. If it does fail, I'll probably end up with an aftermarket windsor block.

[floydamus]

yea same with the stock 302 block they have had a crap load of power put to them but ya never know when it will crack and spray oil and catch on fire. thats why im going with a dart iron block to eliminate alot of that chance. but im planning on soem where between 500 and 700 hp. it probably goign to be around the 625 650 mark maybe more. good luck to ya thought

[Cbass]

Lightwall would work fine, not sure but I think it's schedule 20... Sched 40 is really thick stuff, you don't need that thick material unless you're a very poor welder.

I would definately advise going with thinner stainless tubing, rather than mild steel pipe. It's more expensive and harder to weld, but it provides a much nicer product, lighter and more durable. Remember, the less weight you have in that piece, the less stress you're going to have on each of those welds while they're contracting and expanding.

[duplox]

Originally Posted by Cbass

I'd be really concerned about the weight of the headers themselves, sched 40 is pretty thick stuff, a foot of 1.5" sched 40 pipe weighs about 5.5lbs, so it adds up pretty fast. I would at least want to use lightwall pipe for making headers. It's not quite as easy to weld, but it's still plenty thick and as long as you keep moving the gun along at a steady pace, you're not going to blow through it easily.

I did a little research, 1.5" nom. diam. sched. 40 pipe weighs 2.8402lbs per foot. So it should only weigh 15-20lbs. I'll decide later what I want to do with my exhaust, I'm working on other things right now.

[Cbass]

Originally Posted by duplox

I did a little research, 1.5" nom. diam. sched. 40 pipe weighs 2.8402lbs per foot. So it should only weigh 15-20lbs. I'll decide later what I want to do with my exhaust, I'm working on other things right now.

Oops, my mistake, I was looking at the overall difference between ID and OD, forgot to half it for one wall.

[duplox]

No problem.. I gotta get my digital camera back, some of the fabrication is starting to come together... My intake now has runners! Just needs a plenum and injector bungs. Hopefully I'll have it done by Monday. It looks awesome so far.
I've also bought some high temperature adhesive to fill the bottom 'dog-leg' of my exhaust ports. The stuff is supposedly good to 2000*, and its machinable. After it hardens, if you wash it it looks like steel. Pretty sweet, but pricey at $35 a pound.

[TheSilentChamber]

what fuel injection kit are you going to use?

[duplox]

Megasquirt, its a speed density system. Using it because its cheep and easy to tune.
http://www.bgsoflex.com/megasquirt.html
already have it put together, sittin on my desk right now.

[TheSilentChamber]

thats cool, I'm definatly probably going to get one of those and do a fuel injection conversion on my gremlin if I ever get around to working on it again lol. Was it hard to put together? I have a fair amount of PCB assembly experience.

[duplox]

I've never put a pcb together, and it took me around 4-6 hours to do it. Once you get the hang of bending the legs just right and a feel for the solder, it goes by fast. Its actually pretty fun.
Its also got an output using a 9-pin connector, so you can hook it up to a computer and it shows 6 'guages' that tell you pretty much everything the megasquirt is doing. Engine RPM, manifold pressure, injector load, where on the volumetric effiency map you currently are, o2 sensor readings... I'm planning on putting a 7" lcd screen along with an old laptop computer in my dash so I can see all this while driving.

[Cbass]

So how easy is the megasquirt setup to tune for fuel enrichment under boost? I've only looked into using it for NA applications, although my brother might want to use it on his 931.

I plan on using megasquirt on my ZE project, with modified Ford EDIS ignition and a wideband O2 sensor. Piggybacking the EDIS would allow me to run different ignition maps for different grade fuels... Apparently not all gas stations have the 94 octane I'm used up here.

[duplox]

Originally Posted by Cbass

So how easy is the megasquirt setup to tune for fuel enrichment under boost? I've only looked into using it for NA applications, although my brother might want to use it on his 931.

I plan on using megasquirt on my ZE project, with modified Ford EDIS ignition and a wideband O2 sensor. Piggybacking the EDIS would allow me to run different ignition maps for different grade fuels... Apparently not all gas stations have the 94 octane I'm used up here.

If you've got a laptop, you can save and load fuel maps into megasquirt on the fly. As many as your computer can hold... so thousands upon thousands. I've got no idea how easy it is to tune, as I've never done it, but from what others say and the tutorials on thier website, it seems pretty straight foward. Being boosted vs not shouldn't make a lick of difference, its a speed density system. The two main factors it considers are pressure and RPM. The built in MAP sensor is good to around 21psi. You can order one that can go higher. There is also a parameter you can change in MS for it to use a wideband o2 sensor.

[Cbass]

Yeup, I've read a few threads on the MS forum about wideband O2 and ignition control, it's what sold me on MS in the first place. Post a thread here when you get it all together