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LS engine questions

onetoncrawler

onetoncrawler

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I'm building an LS engine for my new rig and I'm trying to determine the least amount of stall I can get away with. I want to trail ride this buggy as much as possible, but I really like to gas it so I'm trying to bump the HP up. I was talked into the cam that I got, but I'm a little leery that it may be too much.
1. Can you guys give some real world experience on this, any experience with similar size cam/engine combo? I know that Andrew and Gregg have been through the LS engine build process
2. Also, I'm wondering can I get away with running 100 octane Aviation fuel? I live next to a grass strip run-way where I can get it cheap.
3. can I get away without running a MAF? I know people who don't run them using Holley EFI, but I've always ran them before using a stock computer

specs
408 iron block stroker (4" stroke)
custom Ross pistons, 4.030" - 13:1 compression
custom Comp cam - GVL - .622 intake/.615 exh.... Duration @ .050 237 intake/250 exhaust
Trick Flow LS2 fast as cast heads (BTR blended valve job, BTR rockers and trunion upgrade, 65 CC chambers, PM guides, BTR .055" head gaskets, .660 lift BTR platinum springs w/ titanium ret.)
summit fabbed intake with 102 mm DBC throttle boddy
Holley 120 lb injectors
LQ4 computer and harness - Lane Culver did the initial tune, will be dyno tuned there or at DBR

Thanks for any feedback guys, I'm nervous that I'm spending money and going to have to pull it out to change the cam after I ride it :-\
 
onetoncrawler said:
I'm building an LS engine for my new rig and I'm trying to determine the least amount of stall I can get away with. I want to trail ride this buggy as much as possible, but I really like to gas it so I'm trying to bump the HP up. I was talked into the cam that I got, but I'm a little leery that it may be too much.
1. Can you guys give some real world experience on this, any experience with similar size cam/engine combo? I know that Andrew and Gregg have been through the LS engine build process
2. Also, I'm wondering can I get away with running 100 octane Aviation fuel? I live next to a grass strip run-way where I can get it cheap.
3. can I get away without running a MAF? I know people who don't run them using Holley EFI, but I've always ran them before using a stock computer

specs
408 iron block stroker (4" stroke)
custom Ross pistons, 4.030" - 13:1 compression
custom Comp cam - GVL - .622 intake/.615 exh.... Duration @ .050 237 intake/250 exhaust
Trick Flow LS2 fast as cast heads (BTR blended valve job, BTR rockers and trunion upgrade, 65 CC chambers, PM guides, BTR .055" head gaskets, .660 lift BTR platinum springs w/ titanium ret.)
summit fabbed intake with 102 mm DBC throttle boddy
Holley 120 lb injectors
LQ4 computer and harness - Lane Culver did the initial tune, will be dyno tuned there or at DBR

Thanks for any feedback guys, I'm nervous that I'm spending money and going to have to pull it out to change the cam after I ride it :-\
Click to expand...

I'm no cam expert, you gotta rely on your builder/tuner to dial in a cam for your needs. But I can give you real world feedback on my setup...

LS2 stroker
Displacement: 405 ci
Compression Ratio: 11.2:1
Cam: Cam Motion custom grind
233/240 @.050
.629/.612 on a 114 LSA +4
580hp

I run a 2500rpm billet race converter. 4.56 gears and 3.0 case and absolutely love the setup. Motor rips but I'm a trail riding guy and I can ride miss daisy all day long, crawl creek beds, **** around or smash the gas and let it eat. Nothing gets hot. Really best of both worlds. Power band is super smooth, has a nice slightly lumpy idle and is totally controllable from idle all the way to WOT. Just looking at your motor specs sounds like you might have a monster on your hands. I would think you're going to need around a 3k stall for that beast (some may say more I err on a lower stall when possible) and I don't think it is going to be a super pleasant experience to trail ride but I could be wrong. It is difficult to build a race motor and have it be a good trail motor and vise versa. You always have to be willing to give up something to get the other. The good news is it's pretty easy to swap cams if you don't like it.

Aviation fuel? No clue. Talk to your tuner. If it is leaded or has different types of additives you may have problems with sensors be sure to clarify that.

I would run a MAF, that's just me.

What kind of power do you expect to make? Those injectors are absolutely massive. Whatever you do I want videos of this thing running. Damn.


edit: What's the LSA?
 
I ran the cam by the buggy builder (Bryan Cole) this weekend and he is happy with the numbers on it, so I feel better in that aspect at least. I also spoke with Ed at PTC about the converter and I think I can get away with a 2500 stall also. I want it as low as possible of course.

I have been studying on the MAF and I agree, I'm going to go ahead and run one.

I did decide to scrap the factory computer and harness and run the Holley HP software.

A friend of mine is the lead technician at DBR so I sent him all the specs also and he is going to help me dial it in and put the rest of the puzzle together.

Based on your engine specs and what I learned over the weekend, I feel a little better about everything.
 
redneckengineered said:
What kind of power do you expect to make? Those injectors are absolutely massive. Whatever you do I want videos of this thing running. Damn.


edit: What's the LSA?
Click to expand...

I'm expecting around 600-650 at the crank as far as power goes -

Not sure what you mean by LSA? I'm not familiar with that acronym, except on the new LS supercharged engines haha
 
onetoncrawler said:
I ran the cam by the buggy builder (Bryan Cole) this weekend and he is happy with the numbers on it, so I feel better in that aspect at least. I also spoke with Ed at PTC about the converter and I think I can get away with a 2500 stall also. I want it as low as possible of course.

I have been studying on the MAF and I agree, I'm going to go ahead and run one.

I did decide to scrap the factory computer and harness and run the Holley HP software.

A friend of mine is the lead technician at DBR so I sent him all the specs also and he is going to help me dial it in and put the rest of the puzzle together.

Based on your engine specs and what I learned over the weekend, I feel a little better about everything.
Click to expand...

Awesome! I would definitely trust those guys judgement. If Ed thinks you can get away with 2500rpm stall definitely go with that. All the guys I ride with that have built LS motors are in the 2500-2800rpm stall range with zero issues. Anything over 3k in a trail rig is asking for trouble IMO. I have not heard about a Bryan Cole build in awhile. Any chance you can post some pictures? I bet it is going to be bad ass.

114 LSA should have a very manageable idle. That's good.
 
redneckengineered said:
Awesome! I would definitely trust those guys judgement. If Ed thinks you can get away with 2500rpm stall definitely go with that. All the guys I ride with that have built LS motors are in the 2500-2800rpm stall range with zero issues. Anything over 3k in a trail rig is asking for trouble IMO. I have not heard about a Bryan Cole build in awhile. Any chance you can post some pictures? I bet it is going to be bad ass.

114 LSA should have a very manageable idle. That's good.
Click to expand...

good deal, that is what I thought too.

Bryan is finishing up Mark Phillip's buggy right now, it should be completely done in a week or two at the latest. Then he will wrap up mine. He doesn't like to share pics along the way, because it takes away from the excitement of seeing it all together in the end. Doesn't really matter to me, but I try to respect that haha.

I would upload a cpl axle pics, but it won't let me
 
Info on 100LL which i have access too...doesn't sound ideal at all..j
Guess I'll have to bite the bullet and get a drum of VP
9677024448278ee7d1e2feba855c6b3e.jpg


Sent from my SM-G950U using Tapatalk
 
onetoncrawler said:
He thinks a little outside the box
8a30d9fcab7761d4c4ed79897e9842de.jpg
6e19b1744cd87a6b1c6454894507eced.jpg


Sent from my SM-G950U using Tapatalk
Click to expand...


Hot Damn, I need a moment and a cigarette.............................................................................................. flashemifyougotem




ADMINISTRATOR
 
Thanks guys haha

Another question.... do you run a wide band O2? If so, just when tuning or all the time?

Sent from my SM-G950U using Tapatalk
 
I've heard of guys that only tune with them and then remove them but i don't really understand the logic. I mean if the computer can utilize the sensor and make constant small adjustments to help your motor run better, why not use the technology?
 
I was specifically talking about the wide band 02, ill run the regular 02 all the time for sure. I've heard of people running the wide band during tuning and then removing it. But I don't know the ins and outs.

Sent from my SM-G950U using Tapatalk
 

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