What would you do?

The 1UZFE EGR Delete Kit is available for sale here.
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Blizzy

New Member
Lets assume you have a 1996 SC400 with a healthy motor that has only 60k miles on the clock. You know that stock compression of 10.4 is a hurdle, but you are looking for extra juice through a twin turbo set up. You have streetability at the forefront of your mind.

Swapping injectors and/or running a larger fuel pump, mounting an intercooler, running the necessary blow off valves, and rearranging the engine bay is expected. You are not oppossed to running a thicker head gasket and aftermarket head studs to better capacitate boost nor are you oppossed to a v160 or r154 swap to handle the load, although you would prefer to push the limit of the stock compression and tranny first. Lastly, assume you are oppossed to rebuilding the engine with fully forged inners.

(1) What turbochargers would you choose to safely boost the stock engine with streetability in mind? Why?
(2) What ECU would you choose to compensate for the boost and safely manage fuel? Why?

I am intersted in hearing from as many of you experts as possible.

Thanks...
-Mark
 
I'm not an expert but I know a bit about these SC400's....

First off, transmission - 400whp and that's pushing it, even with a tranny cooler... Shifts may still be untimely, etc...So your goal if your keeping the stock tranny should really be two small turbo's or the single garrett GT35R turbo should work fine...No need for engine buildup if staying with the stock tranny...The stock 1uz-fe internals can handle 400whp easily...

If your going for a R154 5 speed tranny swap or even better the supra TT V160 6 speed then that opens up the door for big things...
 
I have read a couple accounts of the 10.4 compression 1UZ's having weaker bottom end components, limiting the horsepower potential of the engine prior to rebuild. Can anyone comment on this?

You mention 400whp as an easy number for the 1UZ internals. Is this possible at 10.4 compression?

You also mention two small turbos as an option for twins. This is what I want. What turbos: GT20? GT25?

I would have no problem swapping a v160. Assuming this and a stock engine at 10.4 compression, what numbers can I safely run?

Can anyone comment on a good ECU for the job?

Thanks...
 
ECU - SMT6 is a real good piggy and the SMT7 is even better...Great piggy backs but expensive..... There are many to choose from depending on your needs..

Your 1996 stock 1uz-fe engine can handle 400whp and 500 torque no problem with a proper tune... No need to worry.. Rods and pistons are going to break first before your bottom end goes...

If your going for a V160 swap which you say will be no problem...Then sky's the limit, throw in some forgies and go for big horse power... Not to sure what the bottom end can handle after your forged piston and rods are in...Studs, etc...

It is still unclear to me what your final power goal is?

If your going for the V160 swap which is a wonderful tranny and can hold four digit horsepower then you better build up the motor and twin turbo it..

Maybe someone else can chime in on the twin turbo setup...You could look at Lextreme's Single garrett turbo setup and or look at SC400tt thread on his twin turbo's.. There are many directions you can go in, but you need to know what kind of horsepower goal you are shooting for...Then you can size the proper turbo or turbo's for the desired application....
 
If the stock engine is able to handle 400whp and 500wtq no problem, why don't we establish goals of 350whp and 450wtq to avoid anything breaking anything in the bottom end. Those numbers are plenty big enough for my liking; I was not aware those numbers were possible from a stock bottom end.

Ultimately, I would prefer to run a simple twin turbo set up with a disturbingly wide and smooth power band that is very streetable. I would not be oppossed to running a dramatic set up, but I would prefer starting at the limitations of the bone stock engine given that they are robust enough for my liking.

Goal:
350whp and 450rwtq at stock compression

- What tranny is most cost effective for this set up? w58? r154? v160?
- What pair of turbos would be best for this set up?
- What ECU would be best for this set up?
 
As I am reading the post again, I see that you saying the rods and pistons would break before the bottom end goes. Are the rods and pistons not considered a part of the bottom end? I thought everything contained within the block was considered a part of the bottom end?

Can 350whp and 400wtq be run on stock compression with stock pistons and rods?

Can anyone else chime in on this topic?

Turbo selection? Is the SMT7 a good piggyback choice for this project?
 

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For the project I am in the middle of I went with a R151F, 5 speed transmission, Autronics SM4 ECU, Twin Garrett GTR25's. The plan was to use stock compression pistons and a thicker MLS head gasket with about 6 psi boost. Things being as they are, everything changed. Now it is Ross 8.5 pistons, 14 psi boost, low impedance injectors (550cc, when I find them) but then again this is a tranplant into a truck. Goal is 500 rwhp. Good luck with your project.
 
andrew k. said:
For the project I am in the middle of I went with a R151F, 5 speed transmission, Autronics SM4 ECU, Twin Garrett GTR25's. The plan was to use stock compression pistons and a thicker MLS head gasket with about 6 psi boost. Things being as they are, everything changed. Now it is Ross 8.5 pistons, 14 psi boost, low impedance injectors (550cc, when I find them) but then again this is a tranplant into a truck. Goal is 500 rwhp. Good luck with your project.
Click to expand...

Is 6psi even too much for stock compression?

What did your 8.5 pistons run you?

If GT25R's are good for 14 psi, are GT20's good for 6-8psi?

What truck: T100? Tacoma? Hilux?
 
Blizzy,
The GT25R was selected for my project. It would have enough air flow for any rwhp I wanted, even more than 500 rwhp. The A/R is .68 and it is a hybrid. There are many people on this forum that are very talented turbo people, I am not one of them. This is my first turbo.

What I was going to do was stock pistons and thicker head gasket but it all seemed like a waste of turbos not to build the engine and get some real boost on it. Another consideration was that I have a '97 engine which has connecting rods that are not as strong as the earlier engines.

The pistons are about $1,100.00 if I remember. That is through Lextreme BTW.

The truck is a 2007 Prerunner 3.0 turbo diesel 2wd. I do not know what it is like in the States. It is a Hilux but a larger one.
 
The stock 1uz will handle 10 psi without much problem, I cracked a ring land at 12 psi but the engine had voer 200K miles on it at the time. I wouldnt think twice about 6-8 psi. I am not sure that this will get you 400whp though. It didnt for me. Based upon my experience you will need to be at 10-12 psi to get 400whp out of it. but then your mmv I think I was at 10 psi for 389, if I remember correctly and at that time I was running a centrifugual Supercharger (vortech), which now that I think of it was robbing some hp. So you may get to 400 with 10psi. In fact Jamie was right at 395 runing on 7 psi with a turbo I believe.

Good luck
 
Mark,
I am installing the Carrillo rods available through Lextreme. Actually Hillbilly on this site is the one that convinced me to change my rebuild plans. I was going to go with a stock engine and have about 6 psi boost. It is now a total rebuild for the engine (90% of the parts through Lex) with intercooled twin turbos and 15-20 psi boost. Goal is 500 rwhp.
 
Sorry to all, my mistake. The rods I will install are not Carillo, they are the rods with the 800 hp rebuild package from this site.
 
I saw the rods and piston combo on the performance parts section but I didnt see the rods listed by themselves.
 
morris said:
I saw the rods and piston combo on the performance parts section but I didnt see the rods listed by themselves.
Click to expand...
You may ask David. I'm just wondering if you could take the pictures of your turbo setup and post them up. Mine is only 1/2 way done.
 
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