stockA4

Thanks for the kind words man. This car has always been such a strong runner I think I'll always keep it a simple n/a setup. I hope to see a small gain from the cam swap and then maybe I'll add some worked over 706 heads and do a little light dieting lol

Tuskyz28

Gotta love that n/a power

War Prayer

Awesome results. I'm curious about the pressures, tires must be hooking well at 25 since you didn't go any lower, but I'm surprised since I usually run that on the street and drop down to 18 at the track.

stockA4

Thanks! If you look closely at post #14 you can see the that the outer edge of the tire wasn't even on the ground lol. Next time out I'll try a few less psi and try to hit them a little harder

stockA4

here's an old dyno of the btr stage III truck cam in an otherwise stock 02 LS1 Z28 with 3.73's in 3rd and the stock converter locked on a mustang dyno, I have another Data sheet somewhere with the conversion factor, lotsa tourqe with this cam in a stock 5.7 though I still need to try the 8714 to see where I gained and where I Lost

TimsLS1

Hi that is of great interest to me I have exactly same cam a BTR stage 3 low lift truck cam in my LS1 here in Australia and Yesterday I purchased a SUM 8714 cam, its on it way from USA and now I read your post and you did exactly same. Let me know what you think of it, it will be a little while yet before I install mine. Did you get it on the dyno ??
Regards Tim

stockA4

No Dyno or track numbers yet I'm still tuning it, I'm very slow when I'm not at the dragstrip lol. the 8714 is going to be hungry for air and a little bit lighter off idle than the BTR stage III truck but really it sounds like you are aren't getting the most out of yours yet because your worried about timing chains breaking with hammers chains don't break and neither do 4L60e's--- they are broken by idiots, instead worry about valve events and so I would consider a wideband street tune to get the true potential out of it. It needs good boltons and tuning to really work it like it should 5600rpm sucks. I bet the 8713 would have even better dynamic compression and pull way higher than 6500 with stock heads and be even more fun with fewer boltons and less converter on the street but that is splitting hairs between the two it's the tuning that counts most!

TimsLS1

Thanks, my BTR 219/224+3 cam (really a 216/221) made 356 rwhp at a low 5700 rpm on low octane which tuner thought was good. 100 rwhp up from stock. I started with around 253 rwhp (most Aussie LS1s are about that stock) and this with only a baby cam and bolts ons, so not too bad but don't like the drop in power after 5900.
I am really impressed with your results look forward to hearing how you go.
I had a look at the low lift high lift versions of the TSP stage 3 truck cam dynos on you tube today in a 5.3 LS,
There is only 13.7 rwhp (15% drivetrain loss M6) 9 rwkw between them and must rev higher to get it. I would like to know what difference that would make to times.

In this article Lunati’s Pochon is quoted as saying,

"At the track, 40 horsepower less will barely get you 1/10 of a second"

article
https://www.lsxmag.com/tech-stories/engine/understanding-ls-valvetrain-upgrades/

stockA4

In this article Lunati’s Pochon is quoted as saying,

"At the track, 40 horsepower less will barely get you 1/10 of a second"

article
https://www.lsxmag.com/tech-stories/...rain-upgrades/[/QUOTE]

If that is true then the Texas speed off road y-pipe is worth 80hp haha

TimsLS1

Yes I find it hard to believe also, I wish someone would chime in and tell us how much a HP increase (10,20,30,40, HP) typically makes in actual times in a LS1, the majority on forums measure success by dyno HP which doesnt always tell us where max benefit for dollar spent is, there is a law of diminishing returns at some point where the little more to be gained must be done at greater expense. It's good that people like yourself are posting times, helps more.

stockA4

There are plenty of online calculators to try, I like the ones at Wallace Racing. Its a lot more than just the amount of peak hp added 10-20 ect, to see gains at the track, it matters more at what rpms those gains are seen, and most importantly how much time the car spends at those rpms when accelerating. I have a great stall converter that keeps my revs well above 5k for the entire run after the first 60 ft so the low end tourqey BTR cam was kinda wasted on my setup, hence why I chose a cam with more duration and overlap to better match my converter and rpm range

ddnspider

iTrader: (26)

Law of diminishing returns....the faster you go the more hp it takes to go faster.

stockA4

That is true, though I still think I'll see a decent gain under similar conditions just because those few extra horses I got from the 8714 over the BTR stage III truck cam will be in use during the entire run down the track at a higher RPM than where peak tourqe occurs with my setup. My butt dyno is already feeling the gains lol

ddnspider

iTrader: (26)

Makes sense, you dont race at 2000 rpms. More fun around town with lowend power but it doesn't win races, area under the curve in the actual RPM used does.

stockA4

Yes but I still have to live at 2000 rpms the rest of the time so a "truck" camshaft works great for what I want. I can deliver pizza in this car and I do sometimes it's so reliable. The 218/224 had brutal useable tourqe everywhere with the stock converter and 3.73's so I would totally do that again, and I really hope my car makes a rockstar out of my new 8714 as well.

*Off topic*

I usually use my high mileage 4.8 swapped camaro instead to sling pie on the weekends(tough job for any St. Louis Camaro haha the roads here are really really bad and there are hardly any 4th gens on the road around here anymore)

Anyways yes I want to love my n/a LS1 forever and it's super quick but Mrspider you are really whooing me with that rearmount build thread sir! I have already built the perfect reliable ride for a "sensible" rearmount that needs to work everyday and I think and you make me want to believe it will work! I've been trying to figure how I would fit stock z28 exhaust outlets and so I've been scribbling some blueprints with my crayons lol maybe I'll make another thread

ddnspider

iTrader: (26)

That's what I'm hear for

LSleeper1500

I'm ready to see the results on the cam swap! Very simple setup for 11's!

stockA4

Thanks I'm ready to see the results too! Unfortunately I wouldn't be able to get a comparable dyno pull with this converter as it is not the type you want to lock at Wot, so it will just be track times once I get it sorted. I'm dragging my feet anyways because the air has been so bad, I'm hoping for a night of at least no more than 500-800ft air density and below 80 degrees if possible but I race at gateway so i should lower my expectations lol

TimsLS1

Did you use the LS6 springs with your BTR stage 3 truck cam? From what I've read lobes a fairly aggressive on this cam despite being low lift, I emailed BTR and they advised against 1.8 ratio rockers.
Regards
Tim

stockA4

Yes I use the ls6 springs on all my stuff and I love them. To find lobe intensity you subtract the advertised duration (@ 0.006) from the typical duration @ 0.050. so for the btrtruck cam you get 269-218=51 for the intake and 276-224=52 for so that's really not that agressive but it does have a bit more of that sewing machine noise under the hood than either the comp cam in my 4.8 (53 for both lobes) or my new summit cam (52 for both). 1.8 rockers are for guys that are scared to change cams lol.

That BTR stage III truck cam is now spinning inside the 706 headed ls6 sprung flat top 5.3 that I slapped together for my 04' suburban with 4.10 gears and it couldn't be happier in there. Turned my truck into a rocketship!!!