An introduction and a few questions...

[djr_81]

Hello to all.
I've been browsing this site for a couple weeks and I must say it's very helpful.
I purchased a 1998 LS400 (with 68K on it) a couple weeks ago and I would like to add some form of forced induction to it in the future.

Originally I had felt that a roots blower would be a good choice due to the low end benefits and the prevalence of used ones on the market.
After driving the car from Florida to New York I've decided against that (The fuel economy was a great deal better than expected...one of the three tankfulls was over 30 MPG).
Now I am looking into both turbos and centrifigal superchargers due to the better economy they will offer at lower RPMs.

The bottom line is I bought the car because it's both very luxurious and has a wonderful motor in it. I want to upgrade the performance of the motor, but I also plan on having the car for a long time, so I don't want to push it too hard and grenade it.

This brings me to a few questions:

The first is what will the 1UZFE motor reliably handle boost-wise on a fairly regular basis? I do not want to upgrade the internals if possible. I know the bottom end is very stout in the motors but I'm a bit worried about the high compression. Ultimately how many P.S.I. should I expect to run without any serious problems?

My second question is what are suitable centrifigal superchargers or turbos for the motor? Any possible links would be greatly appreciated as well.

Third, if anybody has done either to a series 4, will a FMIC fit anywhere? I'd definitely prefer to intercool if possible.

Thanks for any and all help.

 

[stevechumo]

The first is what will the 1UZFE motor reliably handle boost-wise on a fairly regular basis? I do not want to upgrade the internals if possible. I know the bottom end is very stout in the motors but I'm a bit worried about the high compression. Ultimately how many P.S.I. should I expect to run without any serious problems?

My second question is what are suitable centrifigal superchargers or turbos for the motor? Any possible links would be greatly appreciated as well.

Third, if anybody has done either to a series 4, will a FMIC fit anywhere? I'd definitely prefer to intercool if possible.

Thanks for any and all help.

Lextreme has boosted his LS400 up to 12 psi in stock condition using thicker head gasket and a rebuilt torque converter. Search around his web and you'll find some info. about how he built his turbo and centrifugal supercharger. However, I'll be putting either a single or twin turbo on my SC400 this summer, it's 1UZFE engine, and probably run about 6 psi to be safe because my car has a little high mileage. Nonetheless, on most Japan imported cars, you can safely boost them up to around 14 psi with good air/fuel tuning and timing.

About turbo or centrifugal supercharger, I'd prefer turbo over centrifugal supercharger because turbo would spool faster given the matched A/R and trim. I heard that on centrifugal supercharger, the supercharger has to wait for the pressure to build up to give boost; therefore, it boosts slower. Also, your LS has a better ground clearance than my SC, which makes me think running the turbo pipes wouldn't be a problem.

 

[Pro]

use an M90/MP112 kit as advertised on this site.

plenty of grunt and still good fuel economy.

 

[Zuffen]

Pro240C,

You've nailed it down.

An M90 or M112 will give low end boost ( where this engine needs it) and you won't need to rev it to 7,000rpm to extract some performance.

 

[stevechumo]

Pro240C,

You've nailed it down.

An M90 or M112 will give low end boost ( where this engine needs it) and you won't need to rev it to 7,000rpm to extract some performance.

That's right. This 1UZFE wouldn't make low end power until like 2500 rpm. For street driving, I would stay in the range of 6000 rpm.

 

[djr_81]

use an M90/MP112 kit as advertised on this site.

plenty of grunt and still good fuel economy.

Now those blowers sound like a good way to go. I looked into them a bit and I like how they bypass at a cruising RPM. I personally would prefer that low-end torque, just didn't realize that some blowers would go into a passive mode like that.

I spent about an hour searching the site and I've been unable to find the kit you said they advertised. I saw the manifold that Jordy's is selling and one or two other manifolds. I also saw the cent. blower that Lextreme is selling for the first gens.
Can somebody point me towards a thread about the kits or one on what I'd have to purchase to make it work?

I'd also like to state that I've never built up a forced induction setup on a car before but I am quite mechanical and an engineering student so I'm pretty confident that with a bit of guidance I can get this done. I am only planning on running low boost without reinforcing the internals so I don't think it'll be horrendously complicated.

 

[Zuffen]

DJR 81,

Rush Imports does a full bolt on kit but is contractually excluded from selling to the States.

You could try purchasing from Jordy or buy a F.A.T. manifold and build your own setup.

 

[Pro]

I'd be PM'ing Jordy about one of his kits.

LOVELY welding - but that's just my opinion and doesn't reflect the opinion of Lextreme.com or any of it's sponsors.

 

[KDog]

You could buy the Kit part from Rush Imports. Then buy the actual SC in the US, this would be fine.
Rush just isn't allowed to sell the SC in the US, but can sell everything else.

 

[djr_81]

So many choices, so little money.

Everything's going to have to wait a bit until I've paid off a good chunk on the car. I really just wanted to get a heads up on who/where stuff was available as well as a ballpark on price. If it's reasonable maybe I'll find a way to get the extra money quicker.

As much as I really like what I've seen in regards to Jordy's work on here I'm a bit tempted by the almost complete setup from Rush (although the price is a bit high). Does anybody know if the intake manifold on that is designed for both clearance under the LS's hood and fitment to a series 4?

At this point it seems I may be doing quite a bit of planning and then some true hot-rodding.

 

[stevechumo]

I'd be PM'ing Jordy about one of his kits.

LOVELY welding - but that's just my opinion and doesn't reflect the opinion of Lextreme.com or any of it's sponsors.

I've the same opinion about the manifold from FAT. It's realy nice casted but there's no fuel injector holes, which in turn costs $1000 U.S. dollars. I can't think how I can line up at the right angles for the fuel injectors if I want to cut the holes and retain the stock fuel rails.

 

[Lextreme II]

I think the best combo would be FAT manifold with Whipple Twin Screw supercharger..... The goal is to fit a largest blower into your setup for future upgrades and boost. 112 and whipple will have plenty of room for improvement. I wonder why Rush can not sell his kit in the US?

I thought Jordy's stop making them. I tried to contact him but no respond.

 

[Zuffen]

Lex,

Neil is contractually restrained from selling into the States.

I'm not sure he wants to sell part kits as there are too many potential problems.

 

[Blown SC]

Now don't flood me with inquiries or info please.
BUT,
The drawings are at the CAD Engineer's for the altering of my manifold to except the MP90 which is available from Magnason for about $1,400 USD.
Will also make a Throttle to Blower assembly.
The MP90 has internal Bypass (Makes easier fitment).
So what I will have available (When time permits completion) will be a Manifold & Throttle adaptor to send to the US.The rest you can source over there.Ok

Yes..Will fit SC400,,LS400,, (GS400 ? Good chance)

Now a little torment for you's..heheheh
How would you like a V8 (1UZ & 3UZ) 4 Door 4WD,,4WS Sedan ??
YES,,They are Genuine Toyota's
Now that will make a Great Blown Sedan
No,,Its not the 4WD Aristo (JDM GS400)

 

[Lextreme II]

Neil,

Is like a kid in a candy store. lol...... Share some of your candies brother.......

 

[djr_81]

Now don't flood me with inquiries or info please.
BUT,
The drawings are at the CAD Engineer's for the altering of my manifold to except the MP90 which is available from Magnason for about $1,400 USD.
Will also make a Throttle to Blower assembly.
The MP90 has internal Bypass (Makes easier fitment).
So what I will have available (When time permits completion) will be a Manifold & Throttle adaptor to send to the US.The rest you can source over there.Ok

Yes..Will fit SC400,,LS400,, (GS400 ? Good chance)

Now a little torment for you's..heheheh
How would you like a V8 (1UZ & 3UZ) 4 Door 4WD,,4WS Sedan ??
YES,,They are Genuine Toyota's
Now that will make a Great Blown Sedan
No,,Its not the 4WD Aristo (JDM GS400)

Excellent. Time is the one resource I have an abundance of right now so I'll definitely keep an eye out on here for when everything is ready for production. Thanks for the heads up on it. Hopefully by next summer I'll make this a reality.

And yes, the car mentioned sounds amazing. I'd love something with the 1UZFE and 4wd. The 4ws isn't too shabby either.