1991 LJ78 3b turbo swap.

[yotahed]

I just returned from a 2500 km run from Salmon Arm B.c. to chilliwack (450km). and from chilliwack to port coquitlam everyday for a week (70km one way) and from chilliwack to salmon arm to kelowna and back to salmon arm. I played with the boost and fuel small amounts along the way, and found a good all around setting that works well and keeps the egts from going crazy. EGT tops out at 1000 up loooong hills in 4th gear. boost is set at 10-12 psi. Truck ran great, nothing broke lol, the one and only problem was on my way home, the #2 injector pipe at the pump was leaking from the part that screws into the pump itself. limped it home about 100kms, tightened it all up and good to go. One other thing is that with a 30inch tire(245/75-16) and a h55f and 4.88's, the revs are way high for use on the highway as well as the speedo being about 20% high. Revs were about 2600 at 80km/h. A set of 33's went on as soon as i got home, and all is much better. 90-100km/h at 2600rpm, speedo is out about 16% or lower. All in all a good trip, im quite pleased with how it turned out.

Cheers all

 

[Traveller]

Hi Yotahead,
Didn't you make any changes to your governor? i did (on my 3b with 1kz turbo) and it made a lot af diference.

 

[yotahed]

Governor

Im not really sure on how to adjust it. I just replaced the diaphram, and turned the fuel up a bit,
Shed some light on what to do with the governor?

 

[Traveller]

The govenor gives more fuel as the vacum in the throtle valve changes. When you put in a longer spring with less tension (mines from a merc a240) your able to give more fuel on the fulload without smoking at low revs. Your govener can be adjsted to work almost the same as a boost compensator like onnthe 1hd-t.

 

[yotahed]

Got any pics of the spring lengths/wire thickness?
So you're talkin about the spring in the diaphram cover, correct? I think i understand the principle. Longer spring, less tension= more range of fuel delivery?

are there only certain types of cars to pull these from? Is the back of that diaphram cover adjustable? I see a bolt/nut end on the very far end....

cheers bro.

 

[Traveller]

Got any pics of the spring lengths/wire thickness?
So you're talkin about the spring in the diaphram cover, correct? I think i understand the principle. Longer spring, less tension= more range of fuel delivery?

are there only certain types of cars to pull these from? Is the back of that diaphram cover adjustable? I see a bolt/nut end on the very far end....

cheers bro.

Hi yotahed, this weekend i'll take some measurement and photo's.
With he change of spring the enrichment patern changes witch folows the turbo better. A spring changes strenght in lenght and thicknes so you get a differend patern. It took some time to find the best spring. read 3b engine manual FU74 if you are interested..
The adjusting bolt at the end of the cap is the idle spring, this keeps your idle revs up (thats wats so nice on the 3b) it wont stall.

Regard,

 

[yotahed]

okay thanks a bunch. I really like playing around with this thing. minor adjustments here and there. no electronics. truly awesome

 

[Traveller]

okay thanks a bunch. I really like playing around with this thing. minor adjustments here and there. no electronics. truly awesome

Hi yotahed, finaly got the time to remove spring and take picture... As you probably know in spite of al the other parts of toyota, the fuel pumps may vary.... I have 3 pumps were 2 of them run like the devil and 1 stays behind.....the best result i could get with my favorit pump is in the picture.... Beware.... I dont use inches
Regards,
Mike

 

[yotahed]

Good stuff my freind. Thats a big help actually seeing them side by side. Thanks very much for doing that I know what a b1tch it is to get at those little screws. I might have to find some allen heads to replace the gay flat heads....dunno what Mr T was thinkin there lol.
So in essence with youre setup, you can back the main fuel off to a lower setting and the spring will manage the top end(high boost) fuel delivery?

Cheers mike

 

[Traveller]

Good stuff my freind. Thats a big help actually seeing them side by side. Thanks very much for doing that I know what a b1tch it is to get at those little screws. I might have to find some allen heads to replace the gay flat heads....dunno what Mr T was thinkin there lol.
So in essence with youre setup, you can back the main fuel off to a lower setting and the spring will manage the top end(high boost) fuel delivery?

Cheers mike

Just like that....maximum power whitout smoking your neighbour out of his house... Took me some time to find out how it worked, but now its near to perfect. Try you nearest bosch diesel service and ask for the mercedes govener spring...
Good luck!

Regards
Mike

 

[yotahed]

Update

Just did a head gasket job. Original gasket wasnt up to the job, coolant and oil leaking out the head.
After a few oil changes it was decided the oil filter location was a bit retarded to get at, interfering with the turbo oil dump and frame rail brake line junction. Oil filter relocation is up next.

Im also having an issue with the first run each day after doing the head gasket. Starts up fine with a little glow, and idles nice after a minute or so, then about 10 mins down the road it will sputter and lack power in 3rd gear accelerating to hwy speed. Like theres air in the lines or something. then it will go away just as fast as it came. wierd. I have my leakage pipe returning to the tank so air cant circ through the system, and bled all the injectors after the HG job. and seems only to do it for a minute or so, then its gone for the rest of the day....maybe an air leak in between the sedimenter and the tank somewhere? Thinking that because it shows up after about 10 minutes of running, going through the fuel in the stock filter and aftermarket water seperator should take about that long i would figure?

Also, "ported" the precups a bit when doing the HG. seems to pick up better and EGTs run a bit lower... The chevy guys do this to their 6.x motors and report higher power and response. to a certain extent mind u, I wouldnt go too crazy with them, I just took the sharp edges off and tried to make all transitions as smooth as possible. Inside the pre cup there is a ridge around the hole, almost like a seam. I figured this would be the most critical area to smooth out as well as the edges on the bottom side. didnt make the hole any bigger though.

Otherwise, 13,000km on the swap and running strong.
got a brand new clutch sitting here calling my name in my sleep........

 

[Traveller]

4.88s with a turbo 3B ...
what size boots you going to be running?
i did the PZ turbo / 5 speed install into a LJ78 and ran 35s, works real nice.
the 3B and the PZ are almost identical in displacement and you will be happy with the results....

pics?

Hi Crushers, i'm driving a 3b turbo with 4.88, 37x12,5 15 , speedo almost identical with GPS. before with H55f and now with A440f( with advantage of AT overdive)
2600 rpm at 120 kmh.

Regard
Mike

 

[yotahed]

Hey mike. The spring for that car is discontinued.... any suggestions? What year 240d was the spring from? The pump number i referenced for the shop was RW375/2200MW27

cheers
Jon

 

[yotahed]

Governor Spring Replacement

So, Im wondering why nobody else has done/tried this spring mod? Or have they and theyre keeping it a secret?
Im intriqued at Traveller's succes with it.




Cheers

 

[Traveller]

So, Im wondering why nobody else has done/tried this spring mod? Or have they and theyre keeping it a secret?
Im intriqued at Traveller's succes with it.
I have exhausted myself phoning diesel shops inquiring about a merc. 240d governor spring, and they either dont phone me back. say its not available, or they say "bring it in and we'll put it on the bench, and see what spring works well"=$$$$$$$

So Im taking it upon myself to get a batch of springs made up custom to the specs on the photo above. Anyone interested? Ill do around 50 peices depending on the price. Let me know if you want one.

Cheers

Hi Yotahed, well i'll tell you the secret, i had my learning scool with a famous toyota guy in holland who tought me these things. if you're curios just visit his site All American Imports BV - 4WD Accessoires
Regards
Mike

 

[Traveller]

Thanks Mike. I really appreciate you giving up this info to share. I think a lot of guys can benefit from this knowledge. I was really disappointed that the bosch part was discontinued.

As far as the custom replacement springs go, theyll be around $15 per spring+ a few bucks for shipping. measurements are 86mm free length, 8.5 coils, 1.56 wire thickness, closed ends, stainless steel. I just got the quote today, and theyll be around 3 weeks to manufacture. I dont know if this is cheaper or more expensive than the genuine bosch part, but a similar spring at lordco(smaller diameter) is around $8CDN.
This could be a great upgrade for all the guys with turbo's 3b's running high fuel/boost levels or any turbo 3B for that matter.
Let me know what you all think

cheers

Hi yotahed, just like you i like to fiddle with the settings, in tried adjusting the pillars in the throtle housing (turnd them) witch changes the vacuum , mounted a 2h throttle housing (this gives better response) , adjusted the max rpm, because this starts turning the fuel back from about 3000 rpm's due to the centrifugal sytem in it. Increased the injecture presure and advance the pump timing...The best result was in the spring, so for a few bucks you can play around.... All i can say... No one believes its a turboed 3b in my cruiser... They're trying to keep up...

Regards
Mike

 

[yotahed]

Is the throttle body/venturi on the 2h a direct fit? Bigger bore? How much advance did u give and how much max rpm increase? Do think with just the spring i would get decent results? Or should i play with advance and max rpm, 2h venturi. If it all helps im in! I have access to cheap used parts. And not scared to play a bit

Thanks mike

 

[Traveller]

Just take it step by step...start with the spring...

The 2h trottle valve is a bigger bore, can be made to fit a 3b intake manifold.

Mike