More cheap power from Lo-po.

[90ltd]

The most I wrung out of the the Lo-po was 155hp 274 tq (at the wheels and that car had 190k) The only mods were: HO throttle body, bored out egr spacer and bored out Lo-po upper, and dual 2.25 exhaust. In my opinion it has 3 liming factors that don't allow more power: 1st: #14 injectors (they maxed out) , 2nd: computer has limited capabilities ( I do have a tweecer, I read somewhere that it works on lo po computers too). 3rd: stock exhaust manifolds have 1.75" outlets ( by using exhaust calculator those are capable of supporting 200hp at the crank) so 200-23%=155 (23% being drive train loss).
I think even stock cam and E6SE heads are capable of more.

So my future plan is: learn tweecer how to, mate #19 to stock cam, use either 5.8 truck exhaust manifolds (if they fit the will be capable of supporting 220hp), and I'll add a ported and welded lower intake. I just to see whats the limit of a lo po. I think it'll be around 175hp 300 tq at the wheels. All of this things other than exhaust and tweecer don't cost anything.
Also I was doing some research on E6 heads. Mustang and truck ones are E6AE and E6TE 62-65cc, Crown vic and others are 69+cc. So I'm thinking by swapping them in I'll gain torque everywhere. The compression will go from 8.9:1 to 9.4:1. Anyways those heads are free .

So first I'm going to swap truck E6's together with 351w truck manifolds (or if I can find cop car 5.8 manifolds) or Mustang headers to my Semi-ho and dyno it. And of course I'll put premium gas in.

So yeah. It isn't my daily. Just my toy.

[Tiggie]

Interesting. What rpm were your peaks?

Consider a gasket match port job on the exhaust ports and manifolds if you're going that route.

I am no engine expert but, from what I see in desktop dyno (yeah I know it's not real), the e6 heads are fine for low rpm high torque stuff under 3k rpm. That's where I drive anyway and non of my junk ever gets past 4K rpm where bigger heads and can really help.

I intend to run e6se heads on my '68 Mustang, because like you said they are free. Will be using an HO cam though, and it's staying carb'd. I want a smooth cruiser instead of a racer.

[gadget73]

I think you'll find the exhaust is the bigger problem in that mix. Unless the injectors are running near max duty cycle and/or its lean the computer and injectors won't get you much. With exhaust that moves, you might actually find that the lower intake becomes a problem. I know everyone says its the heads, and they are not wrong, but I got noticeable improvements on a stock HO just by changing the lower intake to a ported one. It evens out the airflow if nothing else and that can't be a bad thing. Strict airflow numbers on the E6 head vs the E7 really are not that different either.

http://www.diyporting.com/E6TE.html


Their testing shows its comparable up to 1/2" of lift and both the lopo and HO cams are under that.

[Brown_Muscle]

Hmm this is an interesting experiment, I'm interested in seeing the results. As far as the 351 manifolds go, the lower won't bolt to a 302, and I would think you would have hood clearance issues with the upper, assuming it bolts to the lower stock lo-po.

Also can you post a picture of your first dyno run?

If you have any tuning questions I have some experience with it, using a quarterhorse, not tweecer, but the theory and what it does should be the same.

[knucklehead0202]

This is interesting, curious to see how it plays out. I'm dumping all this shit for a mustang computer, built motor, and mostly aftermarket stuff, but it will be neat to see what a budget-built lopo turd can pull out. Decided to trade the heads I got for something a bit more conservative; RHS 200's with port work are for a serious-effort engine, and I'm going mild and hopefully "smog legal". Cool thread and look forward to more news.

[pantera77]

Your not maxing out the injectors with a throttle body and exhaust.

Here's my combo for a cheap "maxed" out lopo. Stock computer, stock 14# injectors, stock fuel pressure. This was in my old wagon, that had 250k miles on it, a dying stock AOD with stock converter, and 3.55's. Best 1/4 was a 16.3, and best MPG was a trip to Detroit where I averaged 24 @ 75mph. It had a very noisy bottom end, and I once seized it solid when I lost my rad and overheated it bad. I let it cool down, through a rad in it and drove it 400 miles home and then put another 5k on it.

I absolutely loved this engine and would gladly swap out the HO in my current wagon for it.

Bone stock lopo longblock
Stock SEFI lower
HO upper
bored EGR spacer
HO TB
1.7 RR's
Stock stang shorties
2.5" off road H pipe
Asspacks dumped at the axle
Full A/C and Smog delete
EGR delete
Electric Fan (later removed)
Underdrive pulley
Timing at ~12*
Stock airbox

Again, this combo had perfect drivability, ran great, and had no issues what so ever. I put nearly 50k miles on it, again, with stock injectors and computer. The only thing I would have liked to change was the shitty stock SEFI lower for one of those old systemax II lowers. And the trans, that trans was awful in every single way.


There is zero support for a lopo computer. In fact I believe the tweecer doesn't support any SD comps but I could be wrong, since I run a QH instead. Either way if you want to tune it you'd be stupid not to do a mass air swap anyways.

Why the fuck would you swap E6's for E6's? Slightly smaller combustion chamber or not that's like saying you'd rather piss yourself than shit yourself. And even if the heads are free, head gaskets, intake gaskets, fluids and time sure as hell aren't.

351 truck manifolds aren't going to fit for shit and why would you swap cast iron bolt anchor manifolds for cast iron bolt anchor manifolds? Would you rather vomit on your pants or shirt?

I'm all for experimenting and trying to make as much power as cheap as possible, but this has diarrhea fest written all over it.

[turbo2256b]

Tuning a SD is a real pain. Converted a Alfa Romao to SD using SEFI from a Honda. took over 200 dyno runs and still might have needed a bit more tweeking.

mY ORIG SET UP WAS
Ford Motor Sport Mass Air conversion kit
HO cam
19# injectors 4 hole
Ported E7 heads 1.84 intakes think 1.54 exh
Ported lower
Ported LOPO upper
Bored EGR spacer port matched to upper
HO TB
Eqi length shorties (think 1 5/8 FMS unequis would have been better)
Mustang off road X pipe
Hooked up to factory 2" mufflers
think inital timing setting was around 13 or 14 with spout removed (this can verry greatly depending on engine)
Ran a water crosover in the rear of the intake into the EGR spacer
Probably had air pump removed at time of dyno runs.
Other tweaks cant remember at this time

Pulled 270 FTlbs @ 2400 RPM, almost 300 @ 3200/3400, down to around 270 again at 4800. fell quick past that point
RWHP ran from 190 to 270 back to 190 about the same RPM as the torq figures

Got 32.9 MPG 3.55 gears

Tried a HO upper and a ported HO upper both seemed to loose low end possibly improved top end by 200 RPM But liked the ported LOPO better.
Some better valve springs might have helped extend the RPM a bit more wasnt really sure if the intake or springs limited the RPM

tHINK THE Tweecer purchased for the 2nd engine might have helped mostly with timing and timing affected calculations in programs in the ECM

[90ltd]

I knew that not everyone will agree (or get angry at me) when I started this thread. I just explained what I did. I very least I'll swap to a ported lower. Maybe I didn't max out the injectors it could've been weak fuel pump. Also the cat converters are required here and those dyno pulls were ran with stock cats. Just catback was different and no mufflers. I just think that stock exhaust manifolds are the biggest bottleneck.

[turbo2256b]

If I remember correctly the factory mustang tube headers added maybe 10 hp when they were firs introduced

[pivichot]

For the tweecer, it does not support all EEC IV ecu's? ask me how I know. Just try to find an ecu which will work with the tweecer so you could modify it. I went with a W4H0 or wh40 code ECU, supposedly it is supported by the tweecer, still need to find out. This ecu came from a 94 mustang.

[turbo2256b]

I think it does but there are some things that year the ecm had hooked up to it that dont in a car of your year. One is the modual on the side of the dizzy was relocated to the fender. Sensors connected to the brakes , steering, eletric fans, dont rember if they had AODEs or not. Some other stuf fpossible. Test leads might be different. It been years since I WORKED ON A 94.

[90ltd]

The thing is that the car became a lot of fun to drive with those mods and would keep up with newer cars up to 85+. My car would out accelerate them and keep distance of about a car length till my speedo got buried. It had happened more than once. Then I would get a thumbs up from them.
My technic was giving just enough throttle so it wouldn't spin the tires and then mash the loud pedal.

[sxcpotatoes]

Why the fuck would you swap E6's for E6's? Slightly smaller combustion chamber or not that's like saying you'd rather piss yourself than shit yourself.

If we have our choice, I'd rather piss myself than shit myself, pantera77. Namely because urine is usually sterile when it exits the body.

[tjc78]

Alrighty then....

[gadget73]

It is. True story. If its not, you've probably got the clap or something. Its also why dink piercings heal reasonably well, they are regularly flushed with a sterile fluid. Just in case you were contemplating some accessories.