Targetnut

OK, Here's the latest,

I've been working on the head, manifold, and throttle. whenever I get a chance, in the meantime I've
been accumulating bits and pieces to fill in all the gaps. And finally have taken care of part one of the big upgrade.

Due to the fact that the head flows almost 60% more air, I need to increase the fuel supply to match the airflow.

This week I upgraded the fuel supply.

Lifted the bed off


Here you can get a good view of my exhaust and rear torque arms


The old rusty fuel pressure line


I used a bigger fuel pump from a Supra turbo


Modified the fuel pump bracket that goes in the tank with 3/8" stainless fuel line



routed the stainless fuel line and mounted a bigger fuel filter in a more convienient location


Adjustable fuel pressure regulator on the firewall


My old fuel pump has notbeen well for some time, when I got it apart I found out why.

The connector pin on the ground side was burnt up





It's scary thinking of that much heat inside the fuel tank.

I didn't get pictures of it, but I rewired the fuel pump bracket with heavier guage wire and the new pump has lugs with nuts for connections


Next I will install the larger injectors and airflow sensor and get that dialed in.

that will leave the mechanical upgrades

I don't know if I can stand the anticipation

Greg_Canada

Even if it did spark, it would only ignite if the tank was empty... not enough oxygen for it to go boom...

Targetnut

I know,

but what if.........

nate V

Hey if your gona go may as well go big
Fill it up all the way !!!

Nevermind I want to read the rest of this thread
and see how she runns haha

Targetnut

I'm in the middle of installing the modified manifold, Injectors, and larger AFM

I'm doing this before the head and cam install because I want to make sure I get it running OK first so that when I first start it up with the new cam I can break it in properly.

First I swapped the guts from my old AFM into the "new" larger AFM

Here's the old AFM


here's the "new" junkyard AFM


Here's the "new" AFM with the guts from my old one


next I got down to it and removed the intake manifold

here is the gasket that has been matched to the ported head and manifold on the existing head. you can see how much smaller the ports are.


So I did some "on vehicle porting"


here is the gasket on the "matched" ports


here's the manifold on the engine


right now I'm in the middle of wiring up the resistors for the low impedance injectors.

I still have to plumb the EGR, and air intake and get it running.

Last night my son and I did some baseline testing. accelerations from 3000 to 4000rpm and from 3000 to 5000rpm. I don't expect really big gains from the manifold on the new head, but I'll repeat the tests bfore and after I install the head and cam.

Gettin close.....

yotasavg

that's sweet!!! please keep it up!

idayota

keep us posted...looks great!

zlathim

Wow- You don't mess around. You are talented as well as ambitious!

That thing is gonna scream when you get it all together. Thanks for the write up and I am eagerly awaiting your next post.

Targetnut

still working on tweeking but the basic observation is that it definitely moved the sweet spot in the powerband up about 700 to 1000 rpm. when I first started it up it was running pretty rich, about 12.5/1.

I adjusted both the spring tension and the air bypass on the AFM and drove it several times while I adjusted the timing. When I first drove it the engine was pinging very bad. I've got the idle emmisions in line and now


I have to start doing some load testing to see where it's at . Right now I just want to get it close and experimaent with the adjustability because when I swap the head and cam I'll have to go back and adjust it again

Anyhow Here's how the underhood looks now.

Turbo4Runner

Very nice!

With all that additional flow, you should drop a turbo in that sucker!

It would really move..

cobra6syc

you should of looked here:

http://www.downeyoff-road.com/Engine...Injection.html

Targetnut

I tore it down to repace the head cam chain and such.

Hooked up a dial indicator and degree wheel to the engine to check the cam,

Uh Oh

My engine builder 268/.425 RV cam, Ain't

I found it to be 285/ .398 Hmm

I got an email in to them so we'll see what they have to say

In the meantime my ride is down for the count.

This sucks

cobra6syc

here is something for you:
http://www.downeyoff-road.com/Engine...Injection.html

Targetnut

Ted at engine builder replied to my E-mail within an hour and said to ship it back for a refund.

I have to admit, I was worried about how this would turn out due to past bad experiences with online vendors.

It's a relief to be treated fairly.

idayota

good news. sounds like a good company to work with.

shoes138

wow thats awesome hope all goes well from here!

Targetnut

in the course of some projects that you loose sight of the objective and start to loose confidence in what you are doing. The last week has been a trying time,

I got a new cam yesterday, it is a bit more than the one I wanted from engine builder, But I felt that with the increase in flow that I was able to achieve that some more cam might work well. I stayed late after work and checked the cam for clearance with the pistons then assembled the head and put everything together. keep in mind the truck has been torn down since Saturday. I filled the cooling systen and discovered a coolant leak at the front of the intake manifold gasket.

It turns out that I did not get the manifold surface flat enough when I blocked it down and the aftermarket gasket I used did not fill the gap. I had used the Toyota gasket fom the head set when I installed the manifold for testing on the old head. So I figured if it was going to leak that easy I should have it milled at the machine shop.

well the leak wasn't too bad just drip drip drip. so I figured I'd go ahead and run it to break in the cam. I got it started right up and ran it between 1600 and 3000 rpm for about 25 minutes. then shut it off and changed the oil and filter. I think this is overkill but it is what the cam manufacturer recommends. well then I figured it would be OK for a quick road test, after all I've been waiting for this for months. so I pull out of the shop and going down the driveway it really seem to have a lot more power. I pull out on the street and hammer it.....

OMG IT RIPS!
Then...

coolant starts spraying out from under the hood. Oh No!

I pull it quickly back into the shop and discover I forgot to tighten a heater hose and it blew off.

So I left it for today and had my wife come and pick me up.

Targetnut

and stripped it down and hauled it off to the machine shop and had it milled flat.

After work I reassembled it and tweaked the idle a bit, it's somewhat lopey,
and took it for a proper test drive.

OMG IT RIPS!!!

It's hard to explain how it runs. As most of you know these trucks strain to get past 5000rpms. But this thing just sings right on past that mark and keeps right on pulling. I guess I'm going to have to get a rev limiter.

Blasting around on streets is a hoot but the real appreciation is the highway. In 5th gear it pulls like it used to in 4th gear (maybe better!) It's like you have to hold it back, It just wants to go.

I've got some testing and dialing in to do and I'll get up some pics of the job in the next couple of days.

rockdawg84

great work . what year/motor supra did you get your fuel pump from? Thanks

beatenyota

sounds like you're gonna have some major rahhhhh