JKrawler

I'm building an LQ9 stroker and I'm trying to get an estimate on HP/Torque so I can make a decision on transmissions/tc combo. From most of the reading I've been doing it looks like around 400-500 hp. Thoughts???

Build List:
6.0 bored .040 over.
Forged Pistons, rods and crank.
Comp Cams XFI High Lift (54-428-11)
Lift
Intake Exhaust
0.571 0.573
Duration @.050
Intake Exhaust
228 230

317 Cylinder Heads (factory with the exception of valve springs and locks)
CC: 71.020 (After Machining)
CR: 10.5:1 (estimate)
Intake Port Volume: 210cc
Exhaust Port Volume: 75cc
Intake Valve Diameter: 2.00 inches
Exhaust Valve Diameter: 1.55 inches

Factory LS Truck Intake Manifold with the 80MM throttle body
I have a set of injectors but I'm not sure what the rating on them is right now.

imma_stocker

iTrader: (19)

you won't hit 500whp with that setup on motor, 450 maybe.

JKrawler

That's good, I'm not trying to break 500hp. This engine is going in my 2007 Jeep Wrangler Unlimited with 1 ton axles. It's still going to be a daily driver so the goal is to run on pump gas. I wouldn't have built a stroker but the short block included the forged rotating assembly. Got it on the cheap too.

RezinTexas

With that stroke and that cam, the factory truck intake will run out of breath at 3500-4000 rpms. It's junk for a modded motor.

JKrawler

This engine isn't supposed to twist 5-6k consistently... It's being built for crawling. Low end torque. Talking with TSP they should be fine.

Can you provide some more information as to how you've formed that opinion?

RezinTexas

How did you decide on that 228/230 cam? That will have peak HP around 6k rmps, and likely compromise on low end torque. If you don't care about 5-6k, then I would stick with the OEM intake and get a smaller cam. Just my opinion

If you want a 6k RPM motor with a 4" stroke and a 228/230 cam, the truck intake will fall on its face at 3500-4000 RPM. This is from my personal experience with my 383 motor (4" stroke) and 224/228 cam. I switched to a ported LSXRT and the difference above 3500 RPMs was night and day. I don't have any dyno numbers but the difference was huge. Below 3500 RPMs was the same, nothing lost.

good luck either way

JKrawler

This cam was recommended by Comp. Thanks for the info, it looks like I'll have to rethink my cam/intake combo.

How's the factory 4L80 holding up? I picked up a 4L60 for basically free but needs a rebuild, Monster Trans has a couple kits they advertise can handle some good numbers.

96capricemgr

iTrader: (1)

Monster doesn't even qualify high enough to be considered garbage. 4l60e can be built well but not by them.
Rossler, FLT, ProBuilt Automatics are among the few who can build the 4l60e, the deep first gear might be nice for crawling.

Don't know why you are worried about pump gas, you could add 100hp on top of what you will get with this cobbled mess and be fine on pump gas.
Asking Comp for a can spec was ignorant, you don't get knowledgeable help calling them, you get someone to read the catalog for you.

JKrawler

hot damn who pissed in your wheaties this morning lol. Do you have a recommendation or just some self-righteous criticism? Carry on, no need for a reply.

dr_whigham

iTrader: (49)

Martin at Tick Performance, or Kip at Cam Motion.

96capricemgr

iTrader: (1)

You mean recommendations like the three tranny shops I listed?
Search it Monster is really really bad.
You know how many ignorant, as in not yet educated on the subject, folks come to the forums with a build list that is a bad joke and want to be complimented, or make excuses for why it is OK like you have?
It is a common occurrence and if your ego will let you this forum can help you get a lot more out of the build.
All of us have made mistakes and most of us want to help the newbs avoid them unfortunately many like yourself want to swear by your mistakes rather than correct them.

Many vendors will decline to tell folks how poor a plan is because that would be viewed as "poor customer service" by the person with the bad plan.
Far as a cam probably a dozen vendors listed to the right that can do better than having a Comp catalog reader spec something.
As cast heads are going to choke the motor terribly though, heads are the foundation of power more than displacement, some porting and a valve job can go a LONG time ways.

JKrawler

Thanks Doc, I'll look them up.

RezinTexas

The OEM 4l80e is holding up great, no issues at all.

JKrawler

Thanks RezinTexas. The 6L80 would be ideal but they are extremely hard to find here in Hawaii and would require a separate trans controller so by default I'll be running an older 4 speed. The 3.8L and 42RLE is super weak for this application so the guy that owned this rig before me tried to compensate by running 5.38 gears. It's fine for off-roading as long as the trans doesn't overheat but it doesn't make up for the lack umph on the pavement. That goes back to the original question - estimated HP/Torque. The 4L80 is supposed to be much stronger but the 4L60 is geared better the application. There's no point in going through all of this to blow a transmission up on mountain hours away from any help so I may end up going with the 4L80 and and re-gear the front and rear, 4.88's or 4.56's would have been a much better choice for this application.

JKrawler

I tried to check out your build Rezin but the pictures aren't showing up. Might be me, not sure. I'll try again when I get home tonight.

We're starting all the block checks today to double check the machine shop. Hopefully we'll be installing the crankshaft and pistons today.