My Megasquirt build, Volksbugly

[volksbugly]

Great install!
Post up your ignition curve, I'm curious

Here is my ignition curve.

[MarioVelotta]

I think you could gain some snap by puling that map back a little, your curve in the low map seems really drawn out. Although I do see you added the timing at the top and I am assuming that was to help when you wooded it from low rpm (but you don't do that right )

[volksbugly]

hehehe you said wooded...

Ok so 14 hour days and working weekends leaves me no time to play....
So, over the last few weeks I only was able to get my side access hole fully cut, cleaned up, mocked up and ready to weld. I'll get the other side done, then weld them both at the same time... (I hope.)

So for the fuel rail hitting I plan to also cut my fender in the same place that it overlaps with the current cut out. Then I am going to put some rubber between the fender bolts and the bolts/access panel.

I've denoted that in one of the images below with where the rubber will go.

extra cuts and mocked up access panel














This image shows what I plan to do with the extra hole that is outside of the frame.


green = rubber
lightbrown/yellow = contact area of fender and body
red trapazoid = area of fender I will cut out.

[panel]

What's the metal template from?

[volksbugly]

What's the metal template from?

Its actually an access panel kit built specifically for the bug its from
http://www.hookyspanelshop.com/
click the How to:

The panels are called HiPacs, Shipped here to California, I think the cost was about 128$, He is in the UK.

I can't rant enough about them they are really an excellent product!. If anyone has dual carbs / throttle bodies, or you just want to change spark plugs easier
Get this! well worth it.

so some details on the panels...
The panel itself (not shown) is a nice gauge stainless steel,
The frame is about 1/8th thick with holes drilled and tapped. It also
came with some nice SS screws

[volksbugly]

Ok I've totally been slacking at updating my build here.

Few new things,
725cc Injectors are in.
shes running great. Duty cycle now maxes around 14.
installed cb oil filler breather
did wiring on new tail lights, weather pack connectors all the pretty ness.
rebuilt pedal assembly, installed extended clutch shaft, big foot pedal.
heck here are some pictures and videos

oh also I now have a new fuel map and ignition map no pictures of that right now
lets just say my previous ignition map was pretty far off.

Injector Dynamics injectors





breather box:








pics to come, pedal rebuild, ignition table, fuel table, roller tube

[Max Welton]

Duty cycle now maxes around 14.

So I think 14% is saying that your injectors are a little too big (flow-wise) for the engine.

I had a similar situation. I reduced my fuel pressure from 40 lbs to 30, causing the injectors to flow less for each ms of open time. This had the effect of making the injectors act "smaller", forcing my VE table values to go up and making each VE cell step less significant resulting in greater tuning granularity. My AFR traces got more stable and repeatable.

Max

[volksbugly]

Duty cycle now maxes around 14.

So I think 14% is saying that your injectors are a little too big (flow-wise) for the engine.

I had a similar situation. I reduced my fuel pressure from 40 lbs to 30, causing the injectors to flow less for each ms of open time. This had the effect of making the injectors act "smaller", forcing my VE table values to go up and making each VE cell step less significant resulting in greater tuning granularity. My AFR traces got more stable and repeatable.

Max

True but the injector dynamic injectors have the best resolution available in injectors. No harm in going to big, means I only have to buy 1 set.

Also I haven't strapped on my turbo, and I eventually plan to build a 78x94 engine.
A little history, my old injectors were "maxing" out, (hehe I know lame pun) so I couldn't get the tune correct.

Oh and I plan to go E85 sometime in the future.

[volksbugly]

Here are my current tables.
I haven't driven this is all just revving. The car is still on jack stands.

[Max Welton]

Here are my current tables.
I haven't driven this is all just revving. The car is still on jack stands.

Ah! Disregard my previous statement. The max duty-cycle is meaningless as a sizing metric if there's no load on the engine.

Max

[andy198712]

Why only 24 max at WOT?

[volksbugly]

Why only 24 max at WOT?

That was just the default ignition curve. I don't have any drive time yet with the new injectors.

[andy198712]

ahhhh,

i enjoyed tuning my spark map, the gains are very noticable i found

[TouringBubble]

I was a little worried about the injector discussion ... I just changed my plans around to include some new injectors. Stock from an Evo ... 560cc. =) I'm running E85 and I don't expect IDC%s to go over 40%.

Thanks for sharing the wiring diagram. that helps me out a little figuring out everything with mine.

[volksbugly]

I just wanted to update everyone on this.. I got a taste of EFI and its awesome ness!... so of course I followed suit like many others...

Pulling out this engine, new engine being built:

specs:
2109cc 76mm x 94mm
tcs-20 engle cam
4340 crankshaft -bugpak
4340 H rods - cb performance
Mahle 94mm pistons
DRD L5 Turbo heads
cb performance hideaway turbo header 1 5/8
1 5/8 Heater boxes
T3/4b S trim with stg2 wheel and .48 a/r exhaust housing
Meth Injection

New things that I am going to install on this motor that I currently am not running
electronic fuel pressure sensor
fuel octane sensor
egt sensors 1 per cylinder
knock sensor

What I currently need to acquire:
cb header, positive side piping for dual carbs
have someone make the dump pipe / muffler setup -I'm thinking of possibly running it out the side like the g-down exhaust
waste gate
bov
electronic boost controller