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Tofuball's '94 XFi; It's all about city MPG
Topic Started: Mar 12 2011, 08:59 AM (39,447 Views)
Tofuball
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Strange Mechanic

HA! I found the vac leak! It was on the underside of one of the hoses on the bottom of the TB, and it would only open up with the engine warm! Sneaky!

I still haven't gotten the new manifolds in the mail yet, but I have painted the old ones to sell them.

I'm seriously debating adding material to the head to increase the quench area. Also adding material slightly after the injectors to increase turbulence and low RPM air velocity a bit. I spent a couple hours trying to find modern injectors to replace the stock turbo ones with to no avail. If anyone has any leads . . .

I have updated the first post to reflect progress. Please let me know what you think of my ideas.
Edited by Tofuball, Mar 20 2011, 08:58 PM.
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Tofuball
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Strange Mechanic

I've been looking in the wrong place this whole time.

The stock injectors are junk. Seriously look at the spray pattern. The mere existence of a cold start injector in this setup should have set off the red flag for me.

Even if I ran them sequential and timed perfectly, they still atomize by blasting the hot intake valve with a stream.

I am not going to use them. Instead I am going to see if I can source some from a Honda Insight (Or other Toyota\Honda hybrid, they have similar injectors for a lot of them, but a different size then the Insight I think) and if they don't fit, I'll make them fit.

They seem to shoot more of a mist. It's still aimed at the valve.

I'd imagine I'd need around 100cc/min, and going over 190 is iffy. I cannot sacrifice fine idle and cruise AFR control as that would impact drivability and MPG.

Insight: PN 195500-3840 ~140cc/min tested at 43.5 psi @ 3 bar - http://www.insightcentral.net/forums/modifications-technical-issues/17392-01-fuel-injector-specs.html
Edited by Tofuball, Mar 22 2011, 08:25 AM.
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Coche Blanco
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I wouldn't cut all the springs 3/4 of a coil. The front like 1/4 of a cut more than the back.
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Tofuball
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OK. I will take your advice. I can always cut them shorter, but I can't cut them longer :)

Do you mean cut the front 1/4 of a coil and the back 3/4? Or just cut 1/4 of the front and leave the back alone?
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mcmancuso
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Have you looked at the 16V sohc injectors? They fit the head and rail.
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bogs
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Duct tape heals all wounds

Quote:
 
| - Make friends with people who have parts cars. Bonus if they're Canadian or European with those MPFI Geos!
Best suggestion I saw :lol
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Coche Blanco
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Tofuball
Mar 22 2011, 09:50 AM
OK. I will take your advice. I can always cut them shorter, but I can't cut them longer :)

Do you mean cut the front 1/4 of a coil and the back 3/4? Or just cut 1/4 of the front and leave the back alone?
Front 1, rear 3/4.
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Tofuball
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Strange Mechanic

Yay, My 3tech valves and bolts have arrived!

mcmancuso
Mar 22 2011, 10:48 AM
Have you looked at the 16V sohc injectors? They fit the head and rail.
They seem even bigger and have about the same spray pattern, but not even aimed right for the G10 head. A downgrade IMHO.
Edited by Tofuball, Mar 22 2011, 02:17 PM.
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nerys
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Grr

if this works tofuball I AM BEGGING YOU help us make a toot so we can ALL do it as well :-) your in maryland. if your not great with pictures I will drive to you and take whatever pictures you think you will need for a good toot.

if you don't have a decent digicam with macro let me know I bet I can find an old one I don't need lying around I can send you anything 2mp or greater after all with decent glass and macro is perfect for this kind of thing. I bet I got a couple of them gathering dust somewhere.
Edited by nerys, Mar 22 2011, 02:29 PM.
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Tofuball
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Strange Mechanic

I got a decent camera, no macro. But if you want to make a "toot" you'll be driving up and down a lot, a lot of mods are going to have MPG measured between them.

What part of what I'm doing do you want the "toot" on? Hell, I'd be happy just to have someone to talk to about this stuff, lot of people's eyes glaze over when I talk about this kind of thing.
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mcmancuso
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I know how you feel...
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nerys
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Grr

all of it. when your all done and you have "maximized" it. I would come down and you could explain everything how you did it take video pictures etc.. details what parts what you had to do etc.. etc..
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Tofuball
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Sounds fine to me! Bow how many people do you know that say "I'm finished" when working on a car, except right before they sell it?

Got the instrumentation cluster cut to size last night, painted it flat black. Going to be EGT, AFR, and VAC. The other two EGTs will get added later. Haven't decided where to put the thermocouples yet (One for each cyl). Maybe I'll wait till I have long tube headers, or maybe I'll just install one thermocouple just ahead of the collector.

Previously I had assumed I'd be able to just drill and tap the exhaust runners in the head next to the spark plugs and get really fast operation, but that might limit the life of the thermocouples, especially at the temps I might run into while tuning.

Edited by Tofuball, Mar 23 2011, 08:05 AM.
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Tofuball
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It's been so tempting to use all these upgrade parts I have on the car right now, but I need to measure the effect each has on it's own and see what I'm coming from stock.

I think I'm more excited about this project then any other car project I've ever tried . . .
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nerys
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Grr

its getting me excited too! I am confident IT IS possible to make a relatively modern car that can do 75mpg for under $10k.

doing it DIY is just pure cream on top :-) I figure every sustained 10mpg you gain over 50mpg would make it worth a trip and some photo's and video. so when you can hit and sustain 60mpg (or 58 if your average 48) then its time for pics and video etc..
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