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Author Topic: 98 4Runner  (Read 76170 times)

Offline Man4God

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Re: 98 4Runner
« Reply #150 on: October 24, 2009, 11:41:46 AM »
Outstanding thread!   ;D  I have PDFed the whole thing and several others for my files.  I have a 97 4Runner with 4x4 already and plan on doing the swap when the prices on 97 SC400s drop.  Between this thread, Smitherz and Cebby's transmission knowledge, putting this together will be a snap!

Offline avocadofarmer

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Re: 98 4Runner
« Reply #151 on: November 08, 2009, 08:17:21 PM »
Do you have any updates on the mileage?

12 seems pretty lousey.....

I am looking into a 2UZ swap into a 3rd gen, would be hoping for 20's or so...?


Offline Cebby

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Re: 98 4Runner
« Reply #152 on: November 09, 2009, 03:47:01 PM »
20's is a lofty goal for something that has the aerodynamics of a brick (and nice and heavy too).  Not to mention, gearing and tire size (ie unsprung mass) are important factors in mileage.

If you can get 15-18, that would be outstanding.  I'm hoping for 15 or so since I'll have 35" BFG KM2's with 5.29's.
« Last Edit: November 09, 2009, 04:00:25 PM by Cebby »
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Offline Chewy

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Re: 98 4Runner
« Reply #153 on: November 18, 2009, 05:53:32 PM »
Hey guys,
Sorry I haven
98 4Runner 1UZ V8
77 Celica

Offline Chewy

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Re: 98 4Runner
« Reply #154 on: November 18, 2009, 06:07:09 PM »
Do you have any updates on the mileage?

12 seems pretty lousey.....

I am looking into a 2UZ swap into a 3rd gen, would be hoping for 20's or so...?

20's is a lofty goal for something that has the aerodynamics of a brick (and nice and heavy too).  Not to mention, gearing and tire size (ie unsprung mass) are important factors in mileage.

If you can get 15-18, that would be outstanding.  I'm hoping for 15 or so since I'll have 35" BFG KM2's with 5.29's.

Here's an update on the MPG...
Every time I fill up, I put in 15 gallons.  With that, I'm getting about 280 miles on one tank.  So if my math is correct, that
98 4Runner 1UZ V8
77 Celica

Offline Smitherz

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Re: 98 4Runner
« Reply #155 on: November 19, 2009, 08:33:33 AM »
Great MPG! I'm thinking the same for my 1UZ swap when it's done. My 3RZ 4cyl was getting like 17MPG no matter if I was in town or on the HWY taking a trip. How annoying when you don't have much power to speak about. I'm hoping for 20+ with my conversion with a conservative fuel map put in my ECU. Good work getting 18+ out of your heavier Runner. And with that huge bumper too! lol. ::)

On a side note I went to Vegas with a friend in his lifted Nissan Titan. Talk about a kick in the balls at the pump - 220 miles on 18 gallons of fuel!! He just laughs as it's a write off for him but damn!  :o
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Offline Chewy

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Re: 98 4Runner
« Reply #156 on: March 06, 2010, 02:20:32 PM »
Hey fellas,
Wow, it's awesome to see other guys getting closer/completing their swaps!  It's worth it in the end!  Anyway, here's my periodic update...

The truck runs great!  As I've said before, this was the best mod I've ever done!!  But nothing is ever absolutely perfect as I'm sure you guys know!  Here are some issue that have been ongoing after logging ~10K miles post-swap...

Exhaust:  I went with compression-bent, 2.5" piping from the manifolds back, into two Magnaflow cats, then into a dual-in/single-out Flowmaster SUV 50 muffler, with a 3" tailpipe.  It worked great until I eventually got used to the new sound of the engine, then I heard it...the drone.  I would be cruising around 2K RPM/65 MPH and the engine/exhaust would be SOOOO drone-y inside the cab.  I mean to the point of not being able to hear someone speak!!  I dealt with it for awhile since I was rarely was driving in that regime, except for a few miles on the freeway each day.  Anyway, I finally decided to do something about it and redid all the floor insulation.  I laid down some Damplifier Pro from Second Skin Audio, followed by 8# carpet padding from Home Depot.  In the front, I added a thermal blanket in between the Damplifier and padding.  "That should do it!" I thought.  Not quite.  Although muffled, the drone was still loud & annoying.  So I decided to move to the exhaust itself.  After a little bit of research on lextreme, most guys were installing 2.25" piping into their SC/LS400's.  That apparently was the magic number for the exhaust unless they were planning on super/turbo charging.  Anything bigger than that, and you got the drone.  So it seemed my 2.5/3" exhaust set up was a little too big for a naturally aspirated 1UZ.  Anyway, I took the 4Runner in and had the Flowmaster replaced with a 24" Magnaflow and had the 3" tailpipe replaced with 2.5".  It helped, but still the drone continues.  I considered replacing all the piping with 2.25, but that's just ALOT more money.  I think the next step is to install a resonator in-line in the tailpipe.  What do you guys think?  Anyone have similar problems with their exhaust set-up?

Oil Pan:  After investigating a leaking oil pan, it looked as though the custom pan I had built was a little too tight between the front differential and front cross member.  When I took the measurements for it, I failed to take into account the torquing of the engine under load and settling of the rubber in the motor mounts.  I'm sure the pan had been contacting the frame every time I gunned the engine.  So I replaced the custom set-up with a stock LS400 pan.  Here's where I found a new problem!  When I was originally fitting the 1UZ and taking measurements for the motor mounts, I had a pretty banged-up oil pan installed on the motor.  I didn't realize just how dented it was until I went to install a near new oil pan...it wouldn't fit!  The engine sits too low in the vehicle and a "normal" oil pan contacts the front cross member.  I'm either gonna have to make new motor mounts or install a spacer place somewhere to raise the motor in the engine bay, away from the cross member.

Oil Leaks :  I noticed this shortly after driving the car after the swap.  The seal on the black oil pan was leaking along with the front crankshaft seal.  After replacing the custom oil pan, the leak around the top went away.  But every morning I find a nice fresh oil spot on the driveway.  I've looked and looked and found both the front and rear crankshaft seals are leaking pretty bad.  I replaced the front seal when I rebuilt the engine but not the rear.  Plus I remember on the front seal, that I had a bitch of a time getting it to seat correctly.  Obviously it wasn't!

The last big issue I've been having is a near constant CEL with a code of P0420: "Catalyst System Efficiency Below Threshold (Bank 1)".  I keep resetting it but it comes back within 50-75 miles.  I've already replaced the front O2 sensors (they came with the motor) but I still get the same code.  My exhaust guy thinks it might be because the exhaust is flowing TOO well.  I don't seem to have any exhaust leaks so my next guess is to replace the cat on the left side.  You guys have any suggestions?

Anyway, that's about it for the update!  I think my next big project will be to buy another 1UZ and have it rebuilt professionally.  I replaced all the necessary seals, gaskets, etc before installation of this one, but it still leaks!  Plus, I want to go all out and have this thing ported & polished, etc.  Smitherz did it right from the beginning!   :)
98 4Runner 1UZ V8
77 Celica

Offline lonczakd

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Re: 98 4Runner
« Reply #157 on: May 14, 2013, 09:20:53 PM »
did you do a body lift on this swap?

Offline Chewy

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Re: 98 4Runner
« Reply #158 on: October 02, 2014, 09:41:12 PM »
Good to see this site is back online but wow...it feels like I'm walking through an abandoned town after a nuclear blast!  Hellllo?  Anybody?  Cebby?  ;-)

did you do a body lift on this swap?
Yes sir, I used a 1" body lift with this swap.  Not entirely sure it was necessary but it was nice to have the extra room!
98 4Runner 1UZ V8
77 Celica

Offline Chewy

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Re: 98 4Runner
« Reply #159 on: October 02, 2014, 09:53:33 PM »
Figured I'd post an update while here...

Truck is still running great.  ZERO issues at all.  The oil leak I was experiencing before turned out to be predominately from an uneven oil pan lip (it was bent).  Once I replaced the LS400 set up with a Tundra setup, it was perfect.

I'm coming up on 60K after installing the 1UZ so time to start thinking about the maintenance check-up.  Not looking forward to the timing belt as it will require removing the radiator, fan, bumper, etc...LOTS of time I have none of anymore.  I actually was going to take it into town and have a shop do the work but after calling around last year to ask about changing the front crank seal, I was unpleasantly surprised to hear repeatedly from shops "oh its a modified vehicle?  Yeah sorry, we won't work on it."  :-/  I know it just a CYA liability thing, but come on...

But anyway, it's STILL the best mod I've done to my 4Runner!!
98 4Runner 1UZ V8
77 Celica