Ls3 H/C/I Dyno guess?
04-15-2019, 10:15 PM
#1
Ls3 H/C/I Dyno guess? So I’m selling all my lsa stuff and just going to build a N/A setup since I found out it’s best for the goals I’m looking to use the car for. I’m hoping I will get close to 500rwhp with my mild cam I was thinking of getting a big cam but since my car will have ac I prefer something more drivable. Here is a list of the mods my car will have
ls3 with lpe ported heads
fast lsxrT intake
227/235 619/625 lift 114 LSA
4” custom cold air intake with 85mm maf
1 7/8 long tube headers
25% udp
electric water pump
t56 with 8.8 rear 4.10 gears
by my research I should be pretty close to my goal what do you guys think?
ls3 with lpe ported heads
fast lsxrT intake
227/235 619/625 lift 114 LSA
4” custom cold air intake with 85mm maf
1 7/8 long tube headers
25% udp
electric water pump
t56 with 8.8 rear 4.10 gears
by my research I should be pretty close to my goal what do you guys think?
04-23-2019, 11:24 AM
#5
What you are running is the FAST LSXRT not the LSXR correct?
IMO I wouldn't run an off the shelf cam that isn't spec for your car it will work and make some power but you are leaving some meat on the bone.
I'm a firm believer in spec'in a cam to your compression ratio, weight of the car, gear ratio, tire height, type of fuel, desired rpm range, head specs like chamber size and flow data between .600" to .700" what lifters etc.
All this plays a major role when running a true custom tailored cam shaft. These off the shelf cams were spec god knows when.
Only reason I mentioned this is back in 2011 I bought a cam from 3 places dyno'd and track tested which all were very close on ET and MPH the tailored on I got from Cam Motion was 2/10s and 3mph better at the track made more under the curve but peak numbers we very similar as well.
IMO I wouldn't run an off the shelf cam that isn't spec for your car it will work and make some power but you are leaving some meat on the bone.
I'm a firm believer in spec'in a cam to your compression ratio, weight of the car, gear ratio, tire height, type of fuel, desired rpm range, head specs like chamber size and flow data between .600" to .700" what lifters etc.
All this plays a major role when running a true custom tailored cam shaft. These off the shelf cams were spec god knows when.
Only reason I mentioned this is back in 2011 I bought a cam from 3 places dyno'd and track tested which all were very close on ET and MPH the tailored on I got from Cam Motion was 2/10s and 3mph better at the track made more under the curve but peak numbers we very similar as well.
04-23-2019, 06:49 PM
#7
That’s actually something I was thinking of doing since I am pretty much getting everything else brand new as far as valvetrain goes. Just since I do have this cam already that was a reason I opted with it. Might go custom though been thinking a lot about it.
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04-23-2019, 08:07 PM
#9
I have a bigger cam in an L77, which is a smaller engine, and the AC works fine in 100 degree weather. Why would AC not work with a big cam? Seems like driveability would become a concern before AC operation would.
04-23-2019, 08:13 PM
#10
04-23-2019, 09:30 PM
#12
Well I ended up sending a custom cam form with cam motion. The more I thought about it especially after keep on hearing from you guys it convinced me into getting a custom cam made for my setup. I will post what I end up with and results as well.
04-23-2019, 09:37 PM
#14
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I actually think you will be between 475-500 RWHP with that Cam with ~11.0:1 comp, true duals, and making sure the 85 MAF
does not provide to much restriction. Could you make more with a bigger cam, or LLSR?.... absolutely, but that cam should drive
very well and the Mid-Length Runners will help carry peak to ~6800+.
Just my .02
does not provide to much restriction. Could you make more with a bigger cam, or LLSR?.... absolutely, but that cam should drive
very well and the Mid-Length Runners will help carry peak to ~6800+.
Just my .02
04-23-2019, 10:15 PM
#15
Post #5 Hio...same cost with mph and et to spare. Why accept what's made for everyone and there's nothing wrong with that.
Or have it your way ...like burger king.. @ the same cost.
Or have it your way ...like burger king.. @ the same cost.
Last edited by Smokey B; 04-23-2019 at 10:23 PM.
04-24-2019, 12:44 PM
#16
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Oh i get optimizing a combo and matching the cam to it. But most peoples stuff is so far off they would never see your results in differences.
Key to these ls3's is first to get a intake that will can feed the heads. It seems thet like alot of plenum volume from our testing and results.
Op is already choking it with a 85mm maf and a 4" cai. Nothing in the intake track should be smaller than the tb.
Key to these ls3's is first to get a intake that will can feed the heads. It seems thet like alot of plenum volume from our testing and results.
Op is already choking it with a 85mm maf and a 4" cai. Nothing in the intake track should be smaller than the tb.
04-24-2019, 09:34 PM
#17
Well since I’m located in California my custom cam form did not go through because of emissions stuff.
So as of now I’m stuck either running the cam I have or shipping the cam to a relative out of state then have them shipping it to me. If you guys think I would gain power by swapping out my maf and cold air I have no issue swapping it out to a 100mm maf or even going SD tune setup.
So as of now I’m stuck either running the cam I have or shipping the cam to a relative out of state then have them shipping it to me. If you guys think I would gain power by swapping out my maf and cold air I have no issue swapping it out to a 100mm maf or even going SD tune setup.
04-24-2019, 10:51 PM
#19
TECH Senior Member
It's not a matter of out thinking the state. Many companies will not ship emission-related parts to California as they get in legal trouble if the parts are for emission-controlled cars, which here means anything after 1974.