ExileLakai

iTrader: (4)

I see a lot of turbos going on 400 and 430s but I'm looking for the peak NA numbers people have seen. I'm still scraping together money to finish my GS racecar. I sold the LS1/T56 combo. I'm thinking once money comes back my way if I should keep the engine in the toyota family by matching a manual tranny to a 1UZ. I would think the 4.3 is a better place to start. My goal is a reasonable 400 rwhp na with the 1UZ.

please no one tell me 1j or 2j I know they are available and make gobs of power and they are up for consideration. I just want to talk about the 1UZ for right now.

thanks
Rob

Solo_D33A

there's a NA ITB cammed 1uz 86 that's making only 330whp....
http://www.a1turbos.co.nz/index.html

ExileLakai

iTrader: (4)

^^^yeah the research I've done so far only yields lower then marginal gains vs the amount of time and money put into it. 1UZ FI is a different story. I'm trying to keep FI away from my next motor for reliability issues. And Im not talking about just the engine I'm talking about everything. The more parts you have hanging off the engine = the more stuff that could break or go wrong. I want a solid 400whp NA V8 engine. I guess the LSx is still the way to go. I just might have to by another one when money gets better. I was also thinking of the 5.7 tundra engine. problem with that is it weights 481 pounds by itself. All the extra weight to make the engine quad-cam really adds up.

GS300-2002

i think rock a lex has the fastest NA 4xx

v8soarer91

Ed's JZA80 Supra 1UZ (www.v-eight.com)

308rwkw (412hp) @ 10,000rpm with VVTi Turned OFF

ExileLakai

iTrader: (4)

I've seen ed's motor before. In a video without a the HP number. I think it would be super cool to run around a track with a 9300 to 10000 rpm v8 but the money is unrealistic for only 407 whp. Its probably a really sick 400 but the ITBs alone would buy a whole engine swap. Sick motor.

speedaddic

iTrader: (10)

nothing is cheap for these motors...going NA definately isnt cheap. I was looking up parts for our motors and man....I just gave up

JBrady

The ONLY way you will get 400rwhp NA is to go with a stand alone management system that will allow at least 8000rpm operation and BUILD the engine to handle high RPM this means at a minimum premium forged rods and probably different pistons and rings.

To make the power will require aggressive camshafts, expert porting, proper intake and exhaust manifolding and expert tuning.

The engines make excellent torque stock so the challenge is keep this torque as the RPMs increase.

Stock GS430 flywheel torque is 325tq at (IRC) 3600rpm. You will need to maintain this amount of torque to 7300rpm to make 450 flywheel horsepower. This will NOT be easy. If torque drops to 300 you will need to turn the engine to 7900rpm and even THAT will be a challenge.

To get camshafts to produce the power above you will sacrifice low end power to a substantial degree.

For the best 400rwhp go two small turbos. The 400rwhp turbo engine will easily outrun the 400rwhp NA engine.

GS FONZy

iTrader: (6)

You do know that's the older 1uz that was rated 250hp.

denut-L

iTrader: (11)

I say slap on a 5.7L block and call it a day

ed_jza80

wow, didnt realise i had a login for clublexus, but seems i do! haha

your goal is a reasonable 400rwhp NA, but then say money and effort is unrealistic? how else to you expect to make 400rwhp NA? at 4.0L you need about 120-125hp/L performance, and the only way to do that is cams/rpm. simple reality of engines and physics unfortunately. you may not need the whole ITB setup, but whatever you new custom intake is its not going to be that much cheaper. i dont think you can start an engine project like this, and have the 'budget and shortcuts' mindset.

cams mean a sacrifice of low end power? look at dyno curve... 175rwkw @ 5800rpm. thats MORE than the stock engine for that rpm point! no loss there. and when an engine is then matched to a correct final drive ratio, the rpm of the engine becomes negligent. its all about gear length and roadspeed. id also like to know why a turbo 400 easily beats a na 400? depends entirely on area under the curve doesnt it? very easy statement to make, and not one easily proved

vwynn

iTrader: (4)

dont the SuperGT supra/SC430 use a built 3uz??

kit cat

iTrader: (6)

holy crap, this would be so much fun...except the GS weighs a lot so i'd be a bit of an oxymoron. I bet it's fun in a JZA80!!!!

GS FONZy

iTrader: (6)

How so? They weigh almost the same.

kit cat

iTrader: (6)

huh, just googled it...didn't know they were within 100kg of each other.