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Anyone have direct comparisons with an SSR intake swap of any kind on a 4.8?
I have an LS1 and an SSR intake to choose from on my 4.8 project. I like the looks and hood clearance of the LS1 much better. I know the recent intake shootout showed some seriously impressive gains with the SSR over the LS1 intake. This was also on a pretty healthy cam/head 6.0 engine. Wondering if gains would be less stellar on a smaller/mild engine.
I’m curious what a near factory 4.8 would gain between the 2. I’ll be running the Howards version of the GM hot cam (219/228 @ 112 .525) and untouched 241 heads with dual springs. Should be a pretty low back pressure setup with Twin 72/68’s.
I went with a 90mm ebay throttle body when I did the swap. Once boost starts to hit around 2800, it comes in HARD. At 10 PSI, I had to add 20% fuel across the board, and full boost hit about 220 RPM sooner.
Those are impressive gains with that SSR intake for sure. I'd consider a small hood scoop or something to clear that intake and let the hot air vent from the engine bay at the same time.
Wondering if alot of the gain is from the larger TB. Also wouldn't be near as impressive on a mild 4.8 I'd bet. I'll try to make it fit. I have a little extra clearance with the hood I'm running. Just been too lazy to test fit it. It's a Cervinis Cobra R hood 2.5" cowl I think.
Didn't think it would fit initially. But with that tight cast 3" 90 firing down it may.
That intake looked like it gained everywhere in the dyno graph. If it just picked up on the top end I wouldn't worry about it on a 4.8. Since it gained everywhere I would think it could still pick up on the 4.8.
I would blame the increased throttle response on the throttle body, but I wouldn't be so quick to give it the credit for the torque gains. Maybe the power holding better above 5500-6600 would be a throttle body benefit, but I think the torque gains comes from a better plenum/runner design. It hits much harder/faster now, boost climbs quicker, and the tires spin easier. I'm going to guess I probably picked up ~50 ft-lbs at peak torque.
Power gains from increased CFM are always going to be smaller with less cubic inches. For this one, you'll have to rely on better runner/plenum design.
I'm sure it will pickup, just curious if it's worth the time/effort/$ and ugliness.
They tested a 78mm TB on the LS1 and a 90mm TB on the Truck intake. I'll have to buy a 90mm TB to run the TBSS. I'm nervous about running a china TB and even those aren't cheap with the senors and all. I have the LS1 intake and TB/sensors ready to go now. I could buy the adapter cheap and run the LS1 TB on the TBSS intake... but will that defeat the purpose of the intake upgrade?
Figure looking at the average numbers the TBSS picked up 26hp and 26tq. Roughly 6.3% of the NA power of the tested engine. 6% NA power increase on a 300hp 4.8 is like 18 hp. Not sure I'll even make 300 NA.
Alot of bench racing I know, just curious to see a real world test. I've seen 20whp improvements going from a 78mm to a 90mm on an ls6 manifold on bone stock LS1's. So the TB can make a big diff on the NA deals. Would be better if they used the 3 to 4 bolt adapters and ran the same TB on all the manifolds.
Last edited by Forcefed86; 05-27-2016 at 01:36 PM.
I had alot of problems with my 4 bolt ebay TB on my TBSS intake. The TPS gave me all kinds of trouble, tried 3 different ones. I couldnt get that TB to respond accel enrichment with my turbo setup the way I wanted. But Im sure my tuning skills had someting to do with it. I finally just got a 4 bolt to 3 bolt TB adapter plate off ebay and used a stock LS TB. Its perfect, I can fine tune my enrichment super well now.
My advice if you can get the truck/tbss style intake to fit just use a stock 3 bolt TB with a adapter.
05-27-2016, 10:59 AM
Anyone have direct comparisons with an SSR intake swap of any kind on a 4.8? 
