Budget 4bd1t -> '94 FZJ80 Build

[ThreeEyedBandit]

Good job on the trailer! When your in a tinkering mood start loosening the wastegate until you start to see a little drop in boost. If the egt's drop turn the fuel screw in while bumping the wastegate up, might be surprised at the results

 

[ThreeEyedBandit]

Also balancing is the proper way to do it, but I've pulled many apart, marked the orientation and reassembled without a hitch. Only time I screwed up was swapping a wheel without balancing, actually broke the shaft on that turbo!

 

[lostih]

Good job on the trailer! When your in a tinkering mood start loosening the wastegate until you start to see a little drop in boost. If the egt's drop turn the fuel screw in while bumping the wastegate up, might be surprised at the results

Hmm...I'm not sure I totally follow. Do you mean loosen the pre-load on the wastegate or change to a lighter spring? I'm pretty sure my wastegate is staying closed all the time. Seems like I could get the same result by just turning the fuel up slowly. Yea or nay?

 

[ThreeEyedBandit]

Yup! You got it. Loosen the wastegate allowing the exhaust gasses to more freely bypass the turbine, allowing the egt's to drop. Then increase fuel while increasing boost to balance the egt's, kind of a round about way to sneak up on it. But if it was me I'd just crank the fuel screw and see what happens!

 

[Dougal]

When your in a tinkering mood start loosening the wastegate until you start to see a little drop in boost. If the egt's drop turn the fuel screw in while bumping the wastegate up, might be surprised at the results

Yup! You got it. Loosen the wastegate allowing the exhaust gasses to more freely bypass the turbine, allowing the egt's to drop. Then increase fuel while increasing boost to balance the egt's, kind of a round about way to sneak up on it. But if it was me I'd just crank the fuel screw and see what happens!

Sorry mate, but that's all wrong.

Dropping boost increases EGT. The idea that EGT is caused by a turbos restriction is false. The contribution of temp due to pressure is minor and completely over-ridden by the loss of intake air density and mass flow.

More boost = lower EGT. It stays this way until you hit the limits of your turbochargers.

 

[ThreeEyedBandit]

Sorry mate, but that's all wrong.

Dropping boost increases EGT. The idea that EGT is caused by a turbos restriction is false. The contribution of temp due to pressure is minor and completely over-ridden by the loss of intake air density and mass flow.

More boost = lower EGT. It stays this way until you hit the limits of your turbochargers.

I know dropping boost raises EGT, but what if we are staying at the same boost but allowing the wastegate to open? I know this wokred with my little c223t in my pup, but there are a many factors I dont understand.

Sounds like he has been tightening the wastegate without gaining anything, which to me says he is light on fuel. I'm just curioua on this whole situation too.

 

[Dougal]

I know dropping boost raises EGT, but what if we are staying at the same boost but allowing the wastegate to open?

Opening the wastegate removes power that is driving the turbine so boost is lost. It's not possible to keep boost the same while opening the gate unless you've just put a lot more rpm on to increase the flow.

 

[ThreeEyedBandit]

Opening the wastegate removes power that is driving the turbine so boost is lost. It's not possible to keep boost the same while opening the gate unless you've just put a lot more rpm on to increase the flow.

Gotcha, that makes sense. Back to me wondering why it worked for me before, or what else changed.

 

[ThreeEyedBandit]

Did you decide what to do about turbos?

 

[lostih]

Yup...mhi rebuild kit ordered. I'm gonna stick with the 18t wheel for now. I think it will be fine for my needs and my 'budget' build is getting a little less budget all the time

I've been reading about turbo rebuilding and called around a few places to get it balanced. The local place balances the wheels disassembled and then just puts everything together without rebalancing. I've also read some about folks just marking the position of the wheels with respect to each other and reassembling without balancing. Seems like if the balancing is do e piecemeal this would be an acceptable practice. Anyone done it that way? Anyone know a shop that will balance the entire assembly in Portland metro area?

 

[Fromage]

For what it's worth, I bought a 16T that I am going to try first, while the 19T CHRA is out for balancing. I am doing the mark and reassemble as per marking method on the 16T. I figure once the turbine housing is on the manifold, I will be able to switch to a 19T in a few minutes, since everything else is the same - The volvo factory 16T compressor housing and the 19T Kinugawa have the same outlet size.

What application is the 18T from? Volvo?

 

[lostih]

Yup. Volvo. 1999 v70 R.

 

[lostih]

Yup. Volvo. 1999 v70 R.

 

[lostih]

Took the truck on a 400ish mile camping trip pulling the trailer this weekend. Did great. I only noticed the trailer a bit on the steepest grades but that's fine. I also took it out in the sand dunes. Super happy I lowered the bump stops before doing that as I hit them...a lot. Not jumping, just going over big rollers and the occasional oops where the sand kind of disappears below ya. Surprisingly I didn't get my best mileage in the dunes

Turbo rebuild kit came while I was gone but I'll have to wait a week to get to it I think.

 

[lostih]

Been slow to work on things lately but slowly picking away at it. Rebuilt the turbo.

I also turned the fuel up. I think my aneroid is preventing the pump from supplying all the fuel I've asked for but at least now I get a puff of black smoke when I take off from a stop. Still top out at 13psi, but it's much peppier. I need to look for boost leaks and possibly remove the aneroid.

Also still working on the throttle cable for the trans. No matter what I do I can't get it to shift unless I let off the fuel. Any A440 experts know if there is something in the valve body that could cause this problem? The trans shifts on if you let off the fuel but won't shift even at lightish throttle no matter how loose or tight the throttle cable is.

 

[lostih]

Been slow to work on things lately but slowly picking away at it. Rebuilt the turbo.

View attachment 935632View attachment 935633

I also turned the fuel up. I think my aneroid is preventing the pump from supplying all the fuel I've asked for but at least now I get a puff of black smoke when I take off from a stop. Still top out at 13psi, but it's much peppier. I need to look for boost leaks and possibly remove the aneroid.

Also still working on the throttle cable for the trans. No matter what I do I can't get it to shift unless I let off the fuel. Any A440 experts know if there is something in the valve body that could cause this problem? The trans shifts on if you let off the fuel but won't shift even at lightish throttle no matter how loose or tight the throttle cable is.

 

[lostih]

Once again the tech of Wheelingnoob proves invaluable. I changed my throttle cable linkage to be similar to his...and the trans shifts great! I don't get why it needs the shorter than spec throw, but it works perfect.

 

[ylexot]

Woot!

 

[Wheelingnoob]

Once again the tech of Wheelingnoob proves invaluable. I changed my throttle cable linkage to be similar to his...and the trans shifts great! I don't get why it needs the shorter than spec throw, but it works perfect. View attachment 935680

Glad we got that sorted out, makes driving so much more pleasant.

Congrats!


...via IH8MUD app

 

[lostih]

End of summer camping trip to the beach. With the added fuel and better shifting the truck drives WAY nicer! EGT's would go past 1200 now if one didn't manage them in locked up overdrive pulling a trailer over a pass...but I can deal with that

Still need to work on boost a bit but very happy with the swap. Nice power. Nice economy.