foxsl

iTrader: (1)

I went through the sticky but it didn't have too much detail except how long before 5.3 and ls1s blew. It also said a good tune is key along with plenty of fuel but I'de like to know more.

Assuming the tune has adequate fueling with 11.0 or richer a/f under boost, is it mainly rpm limit?? If you were to have 2 perfectly tuned lq4s, but one revved daily to 6600 rpm and the other never saw past 6000 rpm, would the last one live significantly longer?

I'm trying to make a stock 6.0 with 500 rwhp(625 chp) last for over 5 years with daily driving and beating on it in boost 4 months out of the year. Is that realistic? I would like to do this without touching the bottom end at all, am I dreaming?

JoeNova

500 to the wheels for 4 years is very realistic.... Thats a very very mild goal for a 6.0 on boost.

foxsl

iTrader: (1)

That is good to hear. I was thinking of tuning to 550-600 rwhp but only visiting that level two track days a year and having fun with 500 rwhp (th400) in a 3000 lb car everywhere else.

pac 1218 valve springs and chromoly 5/16" pushrods (0.080") have been added for extra security

yenkomike

iTrader: (2)

I don't see any issue. mine never see's 6000 rpm and on 10# and 11 * timing it runs 10.50 I see no reason it wont last 100k that way. and it already has 175k on it lol.

foxsl

iTrader: (1)

That is impressive, how high do you spin it and what turbo?
Thanks

yenkomike

iTrader: (2)

I shift it around 5600 to 5700 , with a tc78 turbo, a 3000 stall converter and 3.23 gear with 28" tire. car is 3400# without me in it.

foxsl

iTrader: (1)

Wow that's all I could ever ask for as mine is 3000lb to 3100 without me in it. You must have a large turbine wheel I'm assuming as everyone says t4's choke 6.0's UNLESS they mean choke at high rpm like north of 6200 rpm.

foxsl

iTrader: (1)

Does torque converter coupling rpm also have a lot to do with longevity? I ask because I read somewhere on here that if it locks up before or during peak torque, there is too much stress on the bottom end.

yenkomike

iTrader: (2)

it has a .96 housing with a 68mm turbine. you can run a smaller turbine and it will give you great spool and makes for a fun streetcar just don't go with to much cam. my turbo is small for my 6.0 but it makes great midrange power so I just keep the rpm low and let it work . cam is a 206/212 comp efi truck cam.

foxsl

iTrader: (1)

Ah ok yes and for a while I'll run the stock 05 lq4 cam just to sort everything out before I step it up. Thanks and when you and everyone else say "small for a 6.0," do you mean at high rpm like 6000+ or at any rpm?

69-chvl

iTrader: (11)

Keep timing low on pump gas...never know if you get a **** batch of fuel.

I hit my LQ9 today with 16psi to impress my friend (which it did), but that's not really smart w/o race fuel at that point. I have timing set to 12* which is less than most run, but the LQ9 has a touch more compression than the LQ4.

foxsl

iTrader: (1)

The only fuel we have in my area is 91 octane with no ethanol and 94 octane with 10% ethanol..so yes I don't even know if 10 degrees will be safe but I hope so and will definitely keep the timing low.

I could also buy 110 vp but if I can safely get away with 91 I will go that route at 500 rwhp

stock48

iTrader: (17)

My truck has a 2005 or 06 lq4 in it and has been making over 900 hp for over 4 years. Has been daily driven A LOT.

foxsl

iTrader: (1)

s400 sx-75 with the 1.25 a/r and t4 housing should complete me Thanks Stock48, JoeNova, Yenkomike and 69-chvl

stock48

iTrader: (17)

No problem, and that turbo works really well for 800HP and under. Went 158mph with one on my nova while shaking it down.

RONIN LSX

iTrader: (44)

I hope you don't mind me jacking your post, but I will also be running a LQ4 (Pre 04) in my 02 WS6 vert.

Are your running an Fbody? What kit will your be using? I was thinking of going with the ON3, sine it retains the A/C (I live in Florida). But I was worried that since it was made for a small frame turbo, that it would be too small for a 6.0. I told to look into something around the 101mm trim.

Like everyone, I'd like to see as much potential as possible, without blowing it up, lol... and being that my car is much heavier than the T-Top/Hard Top, I need a few more HP to make up for the vert chassis and my fat ***, lol...

foxsl

iTrader: (1)

No worries as the more knowledge that's out there the better. Nope not an fbody and what I have gathered is that if you stay t4 with a 6.0, get a large A/r. I was recommended a 1.25 A/r and a turbine wheel of 83mm or larger. Compressor wheel of 75mm+ is also apparently what is preferred.

I, like many others, will be using flipped lq4 exhaust manifolds instead of a kit aside from an intercooler kit. I'm not sure if truck manifolds will clear A/C for you. It gets hot where I live as well in summer but I can live without a/c in my car as I'm not driving around all day. With on3 they let you upgrade the turbo for their kit so you probably won't have any issues getting a t4 from them that suits a 6.0

foxsl

iTrader: (1)

My power goals are 600 rwhp maximum however I will be supplying enough fuel for a safe 650+ rwhp as that along with a good tune is very important. I have heard great fueling capabilities of a 400 lph in-tank pump by people that continuously shoot to 700 rwhp and still haven't reached that pump's limit. Everyone will say -6AN feed and -6AN return will be sufficient for way over 600 rwhp however to alleviate extra strain due to bends and this and that, I'm going -8AN feed and -6AN return. 80 lb injectors(I'm not using e85 simply because I don't get access to it in my area). Will just be using the factory pcm for tuning and HP tuners for the program.

JoeNova

The On3 78mm should work great for your 6.0.

1bad03snake

iTrader: (16)

I have a 6.0ls in my mustang with a s475 th400 It made 706rwhp and 877 rwtq on 17lbs and meth I spin it to 6700 rpms. I had a tc78 on it last year and had back pressure issues