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Old 12-28-2020, 09:42 PM   #1
ChevyCav
 
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Opinions on NA build set up.

Hey all, I just recent had a Cam/CAI/Flex fuel/Ported heads/Long tubes/off road connection pipes installed on my car. It made a modest 535 HP and 477 TQ. I know Iím leaving horsepower on the table since Iím still running a stock throttle bottle and intake manifold. I want to have a pretty solid NA build, and ive been doing my research but still have trouble making a decision.

Iím wondering what the benefits are with running a ported LT2 vs. MSD vs. something else, and equipping this with a throttle body to get the most out of the build. Should I got with a ported 95mm or a 103mm? What would the you guys do?

What would my estimated numbers be with the addition? My end goal would be 600 whp all NA but I know without some serious engine modification and probably a bigger cam that ainít happening.

Any information would be greatly appreciated.
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Old 12-28-2020, 09:53 PM   #2
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I think since you already have a cam set up you won't benefit that much from the Lt2 as it may not make hp in the rpm range of your cam. Ported Msd or High Ram would make more since and probably the 95mm would suffice with your mods. The MSD will make more hp in the upper RPM range where you just won't see that with the Lt2 in my opinion.
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Old 12-28-2020, 11:00 PM   #3
ChevyCav
 
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Originally Posted by laynlo15 View Post
I think since you already have a cam set up you won't benefit that much from the Lt2 as it may not make hp in the rpm range of your cam. Ported Msd or High Ram would make more since and probably the 95mm would suffice with your mods. The MSD will make more hp in the upper RPM range where you just won't see that with the Lt2 in my opinion.
I attached my dyno graph, you make a few valid poiints. I just want to weigh my options being that the LT2 is significantly cheaper and some of my research has pointed to it being better in some aspects. I am also leaning towards the 95mm also has I feel thats what most people use in their builds. I just wasnít sure with the 103 mm and how people feel about it.
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File Type: pdf Dynojet Research.pdf (528.7 KB, 35 views)
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Old 12-28-2020, 11:47 PM   #4
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Originally Posted by ChevyCav View Post
I attached my dyno graph, you make a few valid poiints. I just want to weigh my options being that the LT2 is significantly cheaper and some of my research has pointed to it being better in some aspects. I am also leaning towards the 95mm also has I feel thats what most people use in their builds. I just wasnít sure with the 103 mm and how people feel about it.
The msd would be way more beneficial to a head/cam setup. As far as throttle bodyís go everyone has had different experiences and opinions. Iíve been through 2 different ported 95mm throttle bodies and both of my tuners had problems with them. Gpi recommended me going to a 103mm and thatís exactly what I did.
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Old 12-29-2020, 02:04 PM   #5
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The msd would be way more beneficial to a head/cam setup. As far as throttle bodyís go everyone has had different experiences and opinions. Iíve been through 2 different ported 95mm throttle bodies and both of my tuners had problems with them. Gpi recommended me going to a 103mm and thatís exactly what I did.
Yeah, Iím just stuck on if I should do 103mm vs 95mm. I see people go back and forth on the topic. I guess Iíll just reach out my tuner and see what they recommend. Thank you all for the input.
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Old 12-29-2020, 06:30 PM   #6
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600 na? i would throw the dyno number in the trash and simply look for a setup that will get you what you want. if a dyno number is what you want, get the car to 580 and shop dynos, you'll eventually find one generous enough to fulfill your goals.

if you want a high output na setup you will need a ported msd/hi ram, at least a 95 mm tb, 2" primary header, ethanol and worked cylinder heads to get started.

edit: an LT2/ZR1 tb will give the best bang for the buck, but not the most gains. id look to pick up 15-20 whp from the intake manifold/tb.

edit2: i now see you have ported cyl heads and ethanol. do you have any real performance measures on the car? those dynojet numbers look pretty soft, but dynos be doing dyno stuff.
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Old 12-29-2020, 09:02 PM   #7
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Originally Posted by s346k View Post
600 na? i would throw the dyno number in the trash and simply look for a setup that will get you what you want. if a dyno number is what you want, get the car to 580 and shop dynos, you'll eventually find one generous enough to fulfill your goals.

if you want a high output na setup you will need a ported msd/hi ram, at least a 95 mm tb, 2" primary header, ethanol and worked cylinder heads to get started.

edit: an LT2/ZR1 tb will give the best bang for the buck, but not the most gains. id look to pick up 15-20 whp from the intake manifold/tb.

edit2: i now see you have ported cyl heads and ethanol. do you have any real performance measures on the car? those dynojet numbers look pretty soft, but dynos be doing dyno stuff.
What? I literally said 600 would be sweet but I know unobtainable with what I have in it right now (this was obviously a theoretical statement and a hoop dream). Iím happy with gaining almost 130-135 whp with what I have. I just know without an IM and TB Iím leaving HP on the table. Just wanted opinions to be lead to the right direction. Iíll also ask my tuner, they did a really good job Iíd say the car drives awesome. But I guess Iíll be steering towards a 95mm TB and the IM is still kinda a toss up, but maybe the MSD? Idk
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Old 12-29-2020, 09:23 PM   #8
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Do it right the first time and get the MSD. or wait for Texas speeds high ram to come out that’s supposed to fit under the stock hood.
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Old 12-30-2020, 12:19 AM   #9
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btr is working on an LTx intake manifold, as well.
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Old 12-30-2020, 12:21 AM   #10
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Originally Posted by ChevyCav View Post
. I’m happy with gaining almost 130-135 whp...
its not uncommon to see fbo cars gain 90 whp. 40 whp more from heads/cam...? long as you're happy.
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Old 12-30-2020, 12:55 AM   #11
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its not uncommon to see fbo cars gain 90 whp. 40 whp more from heads/cam...? long as you're happy.
Thatís nice. Still forgetting the IM/TB, Iím sure itíll boost that +40... thanks for the input. Also to piggyback off your previous posts the dyno is just a tool. Iíll be scouring the market for a used ported MSD hopefully. Maybe when the numbers come out for the new IMís that could also be an option. Iíll keep an eye out. Thanks all for the input.
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Old 12-30-2020, 08:48 PM   #12
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Originally Posted by ChevyCav View Post
Yeah, Iím just stuck on if I should do 103mm vs 95mm. I see people go back and forth on the topic. I guess Iíll just reach out my tuner and see what they recommend. Thank you all for the input.
I'm running 103mm with msd intake manifold (unported) , going cam and heads soon so will have new numbers after. At 480/470 whp/wtq.
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