Ls1bozo

Stock lq4 . intercooled 80mm turbo with 80lbs injectors on e85 and 799 heads. People say they pushing 15lbs boost on stock internals and 15* timing but never Specifying turbo size or anything else or fuel. Especially since all of that matters. I'm just trying to see what I can squeeze out of this stock block. And if I want more what would I have to upgrade? Forged pistons? Or piston and rods?

jordoza

People have pushed far more then 15 pounds on stock internals. Turbo needs to be as efficent as possible. Tune needs to be spot on. E85 for the win in my opinion. Pay attention to timing in the torque peak area.

As for stuff to upgrade to get more. Depends on the year of your lq4. If it gen 3 upgrade those rods if its gen 4 pour the boost to it. Either way on e85 youll be out of injector before you hurt anything if your tune is good. In my opinion.

Nismo Kid

iTrader: (3)

An engine is basically an air pump. Boost is a measure of the efficiency of the system. The more efficient your air pump, the more air you flow through it, the more fuel you can add, the more power you get. A better flowing cylinder head and intake manifold, also known as a more efficient system, Will absolutely make more hp at the same boost pressure than a poorly flowing cylinder head. This will also lower intake air temps creating even more power. Your exhaust, cam overlap, back pressure, & many other variables can impact your boost psi also. A 30psi system @ 1:1 back pressure is going to make more than a 30 psi system with 1.5:1 back pressure. Really what you'll need to do is set goals. Blindly trying to build a car with no goals exhausts way more resources & funds than a properly goal ordinated build.

jordoza

Nismo is correct. Setting a goal like "i wanna build a 800hp lq4" would be alot easier to help with then what should i upgrade to make more. I went for weakest link but i could have just as easily said heads, block, forged rotating assembly, 210 injectors etc. Set a goal and start towards that. It will make you happier in the end all around.

Ls1bozo

I'm aiming for 900rwhp. That a my goal to wise

Ls1bozo

more specifically it's either an lq4 or lq9 as far as what generation it's out of a 2004 or 2005 I believe.

Ls1bozo

Apparently I have a gen 3. It's a 2005 and gen 3 didn't switch till 2007.5. So I'll have to up grade rods then. I'll prolly just buy rods and pistons sets. Easier and more worth it. I've seen some people swap and use "old piston rings" good idea or moron idea

jordoza

Why chance it to save 100 bucks. IMHO

kbracing96

iTrader: (25)

All lq9's had flat top pistons, floating pins and the gen 4 style rods. And most engines 04 and up have the gen 4 rods as well.

Kyle11784

iTrader: (14)

for what its worth I have a stock lq4, stock heads, ebay head studs, btr stage 2 turbo cam and of course dual valve springs. Running a Borg Warner S484 (96/88) at 15lbs right now on E85 as well. Only drive this car hard and it's only driven on the street. Just make sure you have a lot of fuel. I'm not sure 80lbs injectors will get you to 800rwhp on e85. I'm running 130's right now with dual 450s. Previous guy made 1100rwhp on e85 maxing them out. Again this is what I heard I am not 100% sure. I'll be going back this spring to turn boost up to mid 20s gunna make this sbe work.

Ls1bozo

what afr should I aim for.

Kyle11784

iTrader: (14)

My gauge reads my e85 in gasoline levels so at wide open throttle I sit around 11.2~afr. What kind of pump are running?

Ls1bozo

I'm going to stay using the fuel pressure regular on the rail.

Kyle11784

iTrader: (14)

should make some nice numbers. Stock cam in the block still? also what car is this in?

Ls1bozo

it's in a 86 mustang coupe. I just want to touch or get close to 800 rwhp. And it has an ls9 cam. Ls9 lifters

Ls1bozo

yenkomike

iTrader: (2)

that single walbro 400 will not get you there on e85 it will get you to about 10 or 11 psi boost then it will start to loose afr going lean in high gear. add a second one or go to a aem 380 second pump if you do that the 80# injectors will go pretty fast.

my nova is setup like that and 17 psi boost it still has fuel left. my buddys 5.3 ran 9.17 at 147 last time out on 80# injectors on e85 23 psi boost 55 psi fuel pressure.on all stock 220.000 mile internals rings,bearings,and rod bolts are all stock

if your lq4 is a 2005 just gap the rings and use ls9 head gaskets and a boost cam and it will live just fine . my nova engine is a 2005 lq4 with 187.000 miles and has been running as a turbo engine for 5 years and in the 9s for half that time. ring gaps are .025, ls9 gaskets , e85,stock truck intake and brackets. single borg 80/83.

Ls1bozo

can't I just go 1 big fuel pump? And I have my fuel system ran to stock truck fuel pressure regulator. And if I do have to run another fuel pump do I run it in sync with the main one? Also I was going to keep the stock ls9 cam with the .600 single springs. And ls9 lifters. As for head gasket I'm using a gm mls head gasket and ls9 gaskets.

yenkomike

iTrader: (2)

you mean the stock lq9 cam? if that is what you meen yes you can just use the gm blue springs and they run pretty good. my brothers Silverado ran 11.30 with a stock lq4 with just springs only at 4300 lbs. but the cam is done by about 5800 rpm

Ls1bozo

the previous owner told me ls9 or ls6 cam