Tmclaurin

So I've been reading these forums a lot, and digging a lot. I've found the fish bracket, buying one soon, going with a vortech v1 or v2, with about 4 or 5 pounds of boost. Then I plan on running a 50 to 75 shot every once in a while, and after about 6 more months do a manual swap. Supercharger plus nitrous i plan to be at 300 whp, so auto tranny shout handle it, but nitrous wont be often. Any advice?

timmy0tool

iTrader: (7)

sounds overwhelming to me, and very expensive but hey if you have the means to do this, that is awesome!

how you will compensate for more fuel with the extra air in the engine? not familiar with aftermarket ECU tuning on our cars. throw nitrous in there and that add another level of complexity in things. interested to see this pull through. check out lextreme forums for crazier builds. things over here tend to be tame and more about maintenance than high performance.

Moarpower

My advice is dont bother with such low boost. If you have a first gen aim for more boost and do the swap. Dont bother with the nitrous. If you have a later model, I wouldnt do either.

Sc0pe

iTrader: (1)

What you're looking to do isn't really a common modification in this forum. You would have a little better luck checking out the Lextreme Forums, as they lean more toward the performance side of things.

Moarpower

Don't be deterred. Manual swaps are by no means common but have been done many times. Especially here in Australia. As for the supercharger, be careful of the height as you may need to alter the hood.

Our ls400 will be undergoing a manual swap soon ND the charger won't get put on this we rebuild a spare motor. Our goal is to experiment with a combo of itbs and cams before we decide to charge it. Would love to see how itbs would work with a SC on these motors just for the sake of science

Tmclaurin

Thank you for the advice everyone, I wasn't sure how active this site was so I didn't expect much feedback. The nitrous is a maybe, not a must, and will be no more than 3 or 4 times a year. The reason I want low boost is so that I'm not constantly putting extra stress on the engine to hit that 300whp, so add in nitrous whenever I decide to. I can't go to the drag strip often, and I work a lot, but for the times I do go the nitrous would help. For everyday driving 4 or 5 pounds of boost is enough to put a smile on my face, and since its non vvti, it's a bit stronger and even boosted it will still be a bit reliable. I got the idea for this after digging through lextreme forum, and found a few interesting builds. I was just seeing if there was anything on this forum I might have overlooked. It'll cost a pretty penny, but I got time. As for how it will fit, I'll be relocating my battery to the trunk and with the fish bracket I will be installing a vortech v1 or v2. Also, I like the idea of cams and itb's, I've thought of it myself, but its not as cost efficient.

Moarpower

Go for it man. The manual swap completely changes the power that these engines Hines put down at the wheels. You will see the biggest change there. 4 psi will give a little more but not as much as the manual swap. If you had the money, I'd do that first.

Tmclaurin

I didn't think the manual swap would change the amount of power, but I would assume it would definitely change the feel of wot.

Moarpower

Depending on the trans you will salvage quite a bit of the low end and hp that gets lost after the flywheel.

Moarpower

The biggest issue is the cost of the swap. In Aus the completed swap including fab, labour and part is between 4.5-6k.

Having driven a manual LS, I would prefer the swap over a 4psi boost.

YODAONE

Try Extrude Honing your intake manifold;

https://www.clublexus.com/forums/ls-1st-and-2nd-gen-1990-2000/846076-1998-2000-ls400-2001-2006-ls430-intake-manifold-extrude-hone.html

Moarpower

Interesting write up mate. Something to add to the list of potential gains. Wonder if there is anywhere near me in Aus that would offer that service. Port matching would be good to do at the same time. My trans has started leaking like mad so Ill be looking at a hefty repair and may be getting a swap done instead. If so Ill post up the process.