ITB's on my 1.6L

[i12drivemyMP5]

And I'm still wiggin over just adding a piggyback MPI NA tuner..........Gonzo project, good info floating around, keep the encouragement flowing. Subbing the coolness.......

 

[Alamo1]

7) "extreme hard mode" is something i've only done once - with varying success - and that is to build a patch harness to allow easy swap backs to stock ECU. This uses nylon male/female plugs, crimps, lots more soldering and a requirement test every connection once they are made. On the car I did this to, we had problems for weeks tracking down phantom wiring problems. Car runs well now...if you're lucky the owner of the vehicle might come and give a testimonial to this method of installation.

One thing i can't save you from is the inevitable soldering iron burns

This is what I have done so far on my Microtech install and I hope it works well. I'll have it up in my build thread soon, maybe this weekend if the baby doesn't come on time. The burns are just battle scars to show you've got balls to do things yourself.

 

[LordWorm]

This is what I have done so far on my Microtech install and I hope it works well. I'll have it up in my build thread soon, maybe this weekend if the baby doesn't come on time. The burns are just battle scars to show you've got balls to do things yourself.

yeah pretty sure now i've done this i wont ever try again - it was a special request...future answers will be basically be get ******.... haha

burns are fine... except when you get burnt in the crease of a knuckle and it doesn't heal because you move your finger around.... ouch!

 

[ajkulish]

And I'm still wiggin over just adding a piggyback MPI NA tuner..........Gonzo project, good info floating around, keep the encouragement flowing. Subbing the coolness.......

**** mpi. i just installed one last weekend. big waste of time, i had a 10.0 afr idle that sounded like a cammed v8 with visible unburnt fuel spitting out the tail pipe. if i revved it brapped like a rotary. i tried to change the tune, but to no avail. its a s*** product.

 

[AzteCypher]

Yup, still working on this. Just trying to sell some of my turbo stuff to fund this project. So if you'd like to help please check out my for sale thread in my signature. Remember, I'd be happy to ship outside of the US.

I've been mostly reading and working with the equations to determine a good runner length. Trying to figure out if it's just as effective to have "x" length runners vs "x" length velocity stacks to achieve "y" overall length from head flange to end of velocity stack.

During one my Google sessions I found this bit of interesting reading. Here's the PDF on Induction Systems and the originating website if anybody is interested.

 

[AzteCypher]

LordWorm, do you have an updated Engine Calc spreadsheet you'd be willing to share/post? I have the one you posted a while back in 2008. Is there an updated one or is that one current?

 

[Ice88]

Te runner length should be from the valve to throttle plate afaik. Also that calculator is the only one I know of that lw posted if he has another one he either slipped it in sneaky like or hasn't updated it.

 

[LordWorm]

There have been no sneaky updates...the maths is still relatively valid (you can do things in the constants page to fiddle with the speed of sound and what not if you want to trick it out for your specific altitude, but from memory i went with speed of sound at sea level....) - its been a long while since i've looked at the principles behind it so can probably not offer anything beyond what is there.

Length is calculated from the valve seat to the throttle plate - and your runned diameter needs to take into account the width of the throttleblade if you want it "perfect" (but probably neither here nor there)...

The calc is meant for use on a tunnel ram intake...i see no reason why it wont work on ITBs either though...

 

[AzteCypher]

I thought length was calculated from valve seat to where the velocity stack starts flaring out?

 

[LordWorm]

I thought length was calculated from valve seat to where the velocity stack starts flaring out?

on a tunnel ram, its the effective length to the end of the runner... (where the runner meets the plenum)

I'd assume (and its just an assumption) that the "end of the runner" in an ITB setup would in fact be the throttle blade.

you can play with the maths, and see what the worst case will be for +/- an inch or so in terms of where it will bias the power...

The inverse shockwave is created when the pressure wave passes the opening - pressure is reflected back down the runner. - its either going to be the throttleblade, or the leading edge of the velocity stack.

 

[lizardman743]

Swwwwweeeet!