We recently did a comparison dyno with the Performance Designs 102 LS3 intake vs the Stock LS3 Intake. The engine is a 416 LS3 based motor, 11:1, Trick Flow Gen X 255 heads, Comp cams 239/255 .624 114 lsa cam, 1 7/8" long tubes with 3" exhaust. The car is a 1971 Camaro, with T56 Magnum and a 9" rear with 3.50 gear. all dyno runs were performed on a Dynojet chassis dyno at the same location. A significant part of what I do is tuning, specifically with the Holley EFI system.

Stock LS3 manifold was run with a 95mm Holley cable throttle body and a Holley Dominator ECU. Timming was run at 24-28* at WOT and we didn't see any appreciable differences on the dynojet dyno. We ended with 25* total timing and an AFR of 12.5

Perfromance Designs 102 Manifold was run with a 103 mm Nick Williams DBW throttle body. All timing and fuel were kept the same as the Stock intake as the motor was happy there with both intakes. I really didn't like the drivability with the DBW throttle body and the big cammed motor and light flywheel, so I fabricated a custom adaptor to run a cable throttle body. I then redyno'd the car and was able to compare a 92mm and 102mm throttle bodies to test for power, as well as drivability between them. This video will be out soon as of 5/2/24

I bought this intake from Pro-touring store, this is my personal car that I use for autocross and track days. No one paid me to do this testing and all results are unbiased and completely objective. Part of having a dyno is learning what is fact and what is myth. I'm going to suggest watching my video on the intital Dyno comparrison rather than me just posting the results. I spent a lot of money and hours of time on the dyno to test this, you can at least watch my video! like, subscribe, comment as well please. I also have other dyno videos.

 

Throw a Rod Modded LS3 intake manifold on there.

 

If someone wants to send us one, we can. Just like all of you, I want the absolute BEST for my car and what I use it for

 

This intake has seen such a wide range of results from euphoric to losing power. Crazy. I wonder why it is so sensitive, and what is causing it?

 

watch the video! I have a haunch that this intake was inspired by the Atomic LS3 intake that never was. I was told by (Sensored) that they couldn't significantly improve on the stock LS3 intake enough to put it in production. The PD intake looks A LOT like an Atomic intake inside, and PD is who makes the Atomic, Fast, and GM intakes. It is a wonderful piece, manufactured very well and looks much cooler than stock. Again, watch the video!

 

Yes I gotcha, but there's also a forum member with 700whp+ HPR 468 in his corvette that has tried many different intake combinations and has been teasing extremely positive results with this intake + flange adapters vs the MSD and Hi ram each with extensive modifications to max them out in power production.

I believe he is working on getting shorter runners and a native ls7 version with PTR currently.

There is major inconsistency in results with this intake so far. I suppose it happens any time something is new.

 

I just tuned one of these on a LS3/525 and all I can tell you at the moment is that idle manners are not great.

Andrew

 

You need to look at what the intake was intended to do. You showed an extreme case way at the high hp end of the spectrum. I haven't seen anything on a stock corvette or camaro yet, which I feel the PD intake was designed to work with because of the fitment they designed it to fit without really any mods. My case I felt was an example of an engine that was near or past the limits of a stock LS3 intake. I could have put a Holley Hi Ram on mine and seen hp gains over stock LS3, but the loss down low for what I use the car for would have bee horrible. I don't think that this manifold is any different than any manifold, in that it has its range of power based on RPM and displacement. My goals were to increase power from 3000-6500 rpm, which I was told this manifold and larger 102 throttle body would do over the stock manifold because the stock runners were not large enough, and the throttle body was a restriction (95 vs 102). This is from PD themselves. Again, watch the video. as well as the next one where I compare a 92 vs 102 throttle body with this intake, again on MY combination

 

Did you watch my video? I had a hard time with the 103 DBW on a Holley dominator. Idle took a day to get it to start, idle, and come back to idle reasonably, not good, just ok. My motor has a big cam, and I feel the holley is also mediocre at DBW, also the bigger the throttle opening, the touchier it is. I put a cable throttle body on it, after designing a custom bracket. I used 92 and 102, idle and off idle seem not as great as the stock manifold, but that might be contributed to the 92 and 102 were china junk, vs Holley $700 95mm unit. I would suggest watching the video

 

I just mailed one to Tony Mamo for porting…

 

Nice to see your not “fudging” the results. If you’re building a hydraulic cammed LS3 I don’t think you can beat the LS3 or L92 intake. I’m going to build a GS dry sumped 6.2 some day with a solid roller and I’ll definitely put a “spider” single plane intake on that build. Right now I’m refreshing a 172K mile L92 and I’ll use that $1000 for forged pistons & rods in my build. I bought some take-out LS3 intake valves along with some PAC beehive springs. Should make around 500HP when it’s done and under $4500 for all the parts & labor. GM did a great job on the LS3 intake👍

 

lmao

 

have tony swing it by here and we can do a direct test agains a stock intake!

 

I have had this intake in & out of my shopping cart probably at least over 5 times in the past year. Even almost bought one used from a guy going for a SBE record that was kind of disappointment by it.
-Have seen OPs vids on it
-Have seen a YouTuber mikeMyke or something like that have problems with the internal fuel rails leaking https://www.youtube.com/@Its_Mike_Myke
-Have seen Cordes Performance (a really great high-end LS shop in AZ) post some great results at 1st, then some issues that they had with one. They are also saying stay stock if planning on a centri blower at all via Facebook
-Have seen a YouTuber make decent gains over stock but then got a vacuum leak they couldn't find or cure.
A very mixed bag indeed. Gut is telling me its not worth a $1000 headache for probably 10RWHP at best. But man does it look way cooler than a boring stock intake.

Any other real world results or reviews yet???

 

It does look great. So I have had it on my car for about 1 year, 416 LS3 Trickflow heads, comp 238/254 .624 cam. As you know I lost 10-18hp/tq up to 5k rpm, and made nothing on the top end really. It looks great. It is manufactured nicely. If fits perfect. I even make a bracket to use a cable throttle body if anybody wants one. I am going to take it off and sell it. I think the folks a Performance Designs are not great people and I would rather not promote their products on my car. I'm putting the all stock LS3 back on it. It won't look as cool, but it will get the throttle response back up a little, and its a whole lot easier to take off and put on if necessary. If anyone is interested in buying my manifold, and/or a bracket to use a cable throttle PM me. I'm willing to lose a few $ on this manifold. I also have the 90* fuel inlet fitting (not installed)

 

Dang just now seeing this. Picked one up for $700 local, so saved on tax & shipping. Figured it might be worth a try at that price point.

 

GPI Ported Rod Mod intake FTW'! I picked up 18 RWHP with it. Much cheaper and no headaches to install.

 

how was torque curve with GPI intake. Any dyno sheets? I have one to go on LS416 getting ready to build. .

 

I have a dyno sheet somewhere, but technically no before/after direct comparison. I'll see if I can dig it out.

 

I ended up making great power (593/525) on the 403” I put this MMS ported intake on. We used a 112 TB. Link…..https://ls1tech.com/forums/generatio...-n-buildo.html