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Looking for troubleshooting help /starting points. My car is 416ci, 9:1, A&A heads and A&A Ti Trim (spinning 54k) 1000cc injectors, Aeromotive Stealth in tank C6 pump(#6fuel line), stock TB,1.78 headers E85, meth. My issue is after Dyno tune only made 675 RWHP. Tuner states and graph shows at 6200 power curve starts to flatten out up to 7k instead of strap climb to 7k typical of centrifugal blower. Blower is making 16#s boost. Please provide any examples of similar experiences. No oil consumption. I’m thinking leak down test, valve springs maybe fuel line size?
Stock TB is fine. I guess stock intake manifold not work well after 6000rpm. I have 402 with YSI, i get 1008hp in 6300rpm. Boost rise after that almost 0.3 bar but it not give more power and red line was 7000rpm. Also VE-table have to lean after 5000rpm.
Did your dynosheet look similar?
You're probably out of blower. I'm guessing you have some sort of cam upgrade too. 9:1 compression ratio isn't going to be good until you get the airflow/boost way up there. A6 transmission?
You're probably out of blower. I'm guessing you have some sort of cam upgrade too. 9:1 compression ratio isn't going to be good until you get the airflow/boost way up there. A6 transmission?
No way hes out of blower, That blower will make 8-900hp on a stock cube LS3. The Ti makes 800 on my car with E85 and meth as well through an A6.
something else is going on here. Are you sure your aren't out or fuel or injector? 1000cc seems really small.
No way hes out of blower, That blower will make 8-900hp on a stock cube LS3. The Ti makes 800 on my car with E85 and meth as well through an A6.
something else is going on here. Are you sure your aren't out or fuel or injector? 1000cc seems really small.
I'm sure it's a great blower. It's fighting an uphill battle dealing with a crazy low static compression ratio and 416 cubic inches. The fact that it is able to push enough air to see 16psi is all good. It's just going to take more air flow than that to make better power. 9:1 static is better suited to a much bigger blower pushing way more air than that blower is capable of. If the static CR was 11.5:1 or even greater with E85 and meth, it would be a different story.
I agree that 1000cc is small for 800+rwhp. I bet the injectors are not the limiting factor as configured though.
Just my opinion. The OP asked. I could be way wrong, but I don't think so.
Stock TB is fine. I guess stock intake manifold not work well after 6000rpm. I have 402 with YSI, i get 1008hp in 6300rpm. Boost rise after that almost 0.3 bar but it not give more power and red line was 7000rpm. Also VE-table have to lean after 5000rpm.
Did your dynosheet look similar?
Stock TB is fine. I guess stock intake manifold not work well after 6000rpm. I have 402 with YSI, i get 1008hp in 6300rpm. Boost rise after that almost 0.3 bar but it not give more power and red line was 7000rpm. Also VE-table have to lean after 5000rpm.
Did your dynosheet look similar?
Stock TB is fine. I guess stock intake manifold not work well after 6000rpm. I have 402 with YSI, i get 1008hp in 6300rpm. Boost rise after that almost 0.3 bar but it not give more power and red line was 7000rpm. Also VE-table have to lean after 5000rpm.
Did your dynosheet look similar?
Originally Posted by schpenxel
Those are also higher compression ratio, he's only at 9:1 (which is a mistake IMO, but I digress).
What pulleys are you running? What's the injector duty cycle at? How much timing? What fuel? Any meth or no?
blower is at 55k , 52k is max recommended ,65%, 16 degrees is all it would take, meth and can not run full E85 only about E45 by blending 93 and E85. with meth
That’s pretty much what I was thinking summed up better than I could have said it. Low compression, higher displacement and smaller blower are all factors IMO.
Stock TB is fine. I guess stock intake manifold not work well after 6000rpm. I have 402 with YSI, i get 1008hp in 6300rpm. Boost rise after that almost 0.3 bar but it not give more power and red line was 7000rpm. Also VE-table have to lean after 5000rpm.
Did your dynosheet look similar?
I have 10.0:1 CR. I dont think your 9:1 CR is reason why not get power after 5500rpm. Yes you can loose maybe 5% power with that CR, but its not really much.
What cam you have? And can you take pic how your VE-table look?
I have 10.0:1 CR. I dont think your 9:1 CR is reason why not get power after 5500rpm. Yes you can loose maybe 5% power with that CR, but its not really much.
What cam you have? And can you take pic how your VE-table look?
Not sure what VE table is , I posted dyno sheet? My plan is , leakdown test, if good change springs, the cam if still low on power? What’s your opinion?
Ve or volumetric efficiency table is your main fuel table when tune without MAF-sensor. I guess you dont have MAF? Your plan sound good. If you have stock spring, sure those should change. And if you have stock cam, then cam change would give easy 50hp.
Hello Your power is low. I have a 416" LS3 8.8CR with IDC 1050 injectors and 917 rwhp at 6600 rpm, 79% duty cycle. I am using about 1/2 point of alcohol injection # 5 jet 4 on the alky control unit. I have a D1X Procharger running 54.2K @ 6600 and making 16.5 lbs. also fast 102 intake and 103mm NW throttle body and ported AFR cathedral heads. I have 18 degrees of timing @ full throttle.
It would be informative if you posted your dyno read out with A/F.
Good Luck
06-23-2021, 03:36 PM
Need Assistance Stroked LS3, SC, HP
