Horsepower seems to be down.
Thread Starter
Staging Lane
Joined: Nov 2009
Posts: 68
Likes: 0
From: Norman Park, GA
Reason for cam choice was i called comp cam and that was the cam they recommended. But after looking for a few days now I’m liking the torquer v2 from Texas speed. Seems a lot of people have good luck with it
Tuner done leak down test and found no issues with that. As far as spinning the motor, I’m really comfortable with spinning it to 6400-6600 rpms. The cylinder heads are Texas speed prc 2.5 5.3 heads with 58cc. I chose that to try and bump compression up to. In my opinion this should’ve been a 500+ motor at the flywheel but the dyno is showing it to be 450-475.
Thread Starter
Staging Lane
Joined: Nov 2009
Posts: 68
Likes: 0
From: Norman Park, GA
Agreed on the torque being so low. It did have a problem before with plug wires being on header but bought msd wires that stick out past the headers fixed that problem. I’m really just baffled at this point. I thought head, cam, intake 6.0 would make good power but it’s making power as just a cammed 5.3.
I've never seen more than 5-8hp and tq difference between the two intakes if he has the mid rise that will be some of his lower peak power number problem, I'm not sure what makes you think it is by his picture posted, I cant tell. the tq number are down due to the intake, if you want a better tq curve take the high ram off and trade for a nnbs but be ready for peak hp numbers to go down. he needs to decide what's more important peak numbers or power under the curve.
I've never seen more than 5-8hp and tq difference between the two intakes if he has the mid rise that will be some of his lower peak power number problem, I'm not sure what makes you think it is by his picture posted, I cant tell. the tq number are down due to the intake, if you want a better tq curve take the high ram off and trade for a nnbs but be ready for peak hp numbers to go down. he needs to decide what's more important peak numbers or power under the curve.
Thread Starter
Staging Lane
Joined: Nov 2009
Posts: 68
Likes: 0
From: Norman Park, GA
The intake i have is a hi ram. I really want this truck to make great power considering it’s not just stock 6.0 with a cam and the power it’s putting down is replicating that. I do know the intake is killing down low but from 4500 and above it should be outshining the nnbs intake. I’m just trying to find the missing puzzle piece here as to why this combo didn’t lay down 400 or more to the tire when I’ve seen very similar combos lay down that or more.
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Verdad Gallardo true but you do need hi rpms to make the loss of tq down low worth it. is it worth losing 25-35 tq from 1500-4500 for the 15-20 that you only see from 5500 to his 6300-6400 shift point? if he was spinning to a 7200 shift point then yea the 35-40 hp may be worth the trade. only the op can decide. its his build. just for *****, id let it gofer now and find a dyno day in your area this spring and try a different dyno out. hopefully a dynojet.
one thought, how inefficient is a truck driveline vs a 4th gen? i know not 50 hp worth but maybe its a combo of a bunch of little things adding up to it all......maybe exhaust is 10, inefficient truck driveline and big tires 10, cam choice 10......not saying these are issues, just thoughts.
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Joined: Mar 2014
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From: Ohio
Seems like a waste giving 6200 RPM worth of losses for a 100-200 RPM gain.
Should he have made more peak? Yes, but it also makes me wonder If there aren't other things in the combination holding power back. Like wrong pushrod length, bad cam timing, dead cylinder from bad plug/wire, etc.
Btw, my experience with high stall yank converters on the dyno has always been lower numbers.
My 200,000 mile 5.7 put down 390 hp 370? Tq on the base tune prior to breaking on the dyno. Sbe 5.7 home ported 243s 224 cam yank 3600 unlocked. Something is askew with his combo. OP, did you degree that cam? It could be a bad grind. It's been known to happen.
In the hot rod intake test, the high ram didn't make any more power than the NNBS/TBSS until about 6200-6300 RPM. He's only turning 6400.
Seems like a waste giving 6200 RPM worth of losses for a 100-200 RPM gain.
Should he have made more peak? Yes, but it also makes me wonder If there aren't other things in the combination holding power back. Like wrong pushrod length, bad cam timing, dead cylinder from bad plug/wire, etc.
Btw, my experience with high stall yank converters on the dyno has always been lower numbers.
Seems like a waste giving 6200 RPM worth of losses for a 100-200 RPM gain.
Should he have made more peak? Yes, but it also makes me wonder If there aren't other things in the combination holding power back. Like wrong pushrod length, bad cam timing, dead cylinder from bad plug/wire, etc.
Btw, my experience with high stall yank converters on the dyno has always been lower numbers.
http://www.hotrod.com/articles/20-ls...ifolds-tested/
Also,
Thread Starter
Staging Lane
Joined: Nov 2009
Posts: 68
Likes: 0
From: Norman Park, GA
Cam wasn’t degreed because comp cam said in doing so would make a little more power down low and we were looking for power up top. Called Texas speed today and they recommend the tsunami v2 cam for my setup. It’s a 235/240 .629/.615 on a 111 lsa.
on a side note, it used to be well known around here that the 5.7s used to thrive with a cam in the very high 220s to under 235 range on both int and exh. now it seems like all the sponsors are on the "you wanna make power? gotta have a 240+ exh duration." maybe im wrong but thats just what ive been seeing and a lot of ppl are running. it seems people are running the 2 ends of the spectrum on their 5.7s lately, either low 220s on both int and exh, or high 230s touching 240s lately. did something change?
Last edited by Floorman279; Mar 8, 2018 at 03:56 PM. Reason: ....
I feel like something is off or restricting airflow somewhere and I doubt swapping the cam will help.
If you already checked the stuff out on the thread that were suggestions, disregard, but before I swapped in a larger cam, I would definitely make sure nothing simple was out of whack
As to degreeing the cam, I do not think it was being suggested to change your cam timing so much as to verify it is what it's supposed to be. I had a cam ground nine degrees off once.
If you already checked the stuff out on the thread that were suggestions, disregard, but before I swapped in a larger cam, I would definitely make sure nothing simple was out of whack
As to degreeing the cam, I do not think it was being suggested to change your cam timing so much as to verify it is what it's supposed to be. I had a cam ground nine degrees off once.
