JoeNova

Someone beat me to the punch, but I might take a shot at a TBSS vs old truck vs Ebay Fab intake on the dyno with the quad turbo 4.8.

Interesting results. Everyone says that the ebay fab intake doesn't perform so well out of boost, but once you add boost it doesn't matter.

The results are very different.
It made more peak HP way way up top N/A, but once you add boost to them, the power different between the 2 was almost eliminated.
Sadly, the point where the ebay fab intake overtook the LS6, was higher in the rev range than most people rev out their 5.3 turbo builds, which would make it a complete loss across the entire rev range for the average person.

BudRacing

iTrader: (3)

Good info. Thanks for sharing. I always love comparison tests with real measurable results.

ddnspider

iTrader: (26)

Boy isn't this a timely post. Well played.

TT427

iTrader: (1)

What were the cam spec's?

AnotherWs6

iTrader: (17)

F short runner ebay intakes. Look great, perform shitty. Like my ****. Wait, reverse that.....

RealQuick

iTrader: (14)

lol...

JoeNova

Just says a 227 comp.

There are only 2 comp camps with a 227 intake duration that would fit well with what they're doing.

54-458-11 - 227/235 .614/.621 113+4
54-480-11 - 227/223 .614/.610 115+3

RedRocketZ28

iTrader: (19)

Every winter I contemplate changing out my LS6 intake for something different. Needless to say, I will be sticking with it.

AnotherWs6

iTrader: (17)

Would love to see that same combo with a TBSS.

svslow

Depends on the application. During a pass my car is never below 6200rpm, so I may benefit from a different intake.

JoeNova

Absolutely, but for the average turbo guy, its a waste of money.

Seeing how much more capable a TBSS is than an LS6, he dropped his TBSS manifold in favor of one of these ebay intakes. His rev limiter is set at like 6300.

With the way the LS6 stays with the fab intake up top with boost, I imagine the TBSS would easily have stayed ahead of the fab intake up to 7000 or so.

You could always increase boost to compensate for the HP loss, which makes some of this irrelevant, but for those already stressing their pump gas combos or turbo efficiency with high boost, increasing it much isn't an option.

JoeNova

And someone I accidently highlighted and typed over my 2nd sentence.
"A buddy of mine recently swapped out his TBSS intake for an ebay fab thinking he would pick up some power with this small twin combination."

Lawhead

iTrader: (14)

You're also on a 4.8 with that shorter stroke that will move the RPM range around

JoeNova

Not to mention, the lower CFM of the 4.8 will force the crossing point for the intakes up higher, meaning it may take 6600 RPM for the ebay fab intake to overtake the LS6 with boost.

Lawhead

iTrader: (14)

I tried to use the TBSS intake but my baby cowl hood wouldn't work

Figured since the blow through set up worked this would have worked........

WRONG......Now I have a Mid-Rise and a TBSS intake just sitting here.

svslow

My thoughts exactly.

AnotherWs6

iTrader: (17)

I probably would of worked something out on that TBSS manifold. My Silverado keeps asking for one to go with its LS6. Oh well.

Lawhead

iTrader: (14)

I still have it

It's actually the *NNBS* which every where I read is the same thing

SLOW SEDAN

iTrader: (13)

x2 most street cars we launch ~4000RPM and shift ~7500RPM when we spec the parts, doesn't matter if its a 5.3, 6.0, or stroker. This example seems to be cammed small for the application on the aftermarket manifold test. If you use an aftermarket manifold choose your cam, springs, shift point correctly. I wouldn't stick an aftermarket manifold on a small cam engine, much like I wouldn't stick a stock manifold on a large cam engine. Some guys have decent success short shifting turbo cars but we always pickup noticeably revving them out assuming the combo is correct. Going from a stock truck intake to a hi-ram picked up ~35lbs/hr fuel usage over 6k RPM at ~25PSI on E85, more at 7500RPM. You can debate what that gain was worth in whp but it was certainly noticeable.

Doesn't the fastest SBE rev out to ~8300 with a hi-ram? Seems like its worth it assuming the combo is correct.

Forcefed86

iTrader: (4)

Hate how these LS magazine guys always put together a big money NA engine and run diddly for boost. 7lbs? What the hell is that… We need the comparison on a stockish build at big boy boost.

In general aren’t you looking for the highest average power over the entire run for the best ET? Since most of the ET is in the first half of the track, I’d think the TBSS or LS6 would be the obvious choice for the average street/strip setup. ESp in the power ranges they are testing in the article.

Most guys without OD or manuals are running a 3.2x-3.5x gear. I barely see 6400rpm at 160mph on what I consider street friendly gearing. My converter couldn’t handle the gearing load when I tried to rev it higher. I actually slowed way down when I dropped the tire size 2” and tried to rev it out more.

If you run a full out drag car and stall the thing to 6500 off the line with a short gear, that’s a different story all together. Street cars with street gearing/tires aren’t going to make the power to hit 7-7500+. I mean 7500 with a 3.27 and 28” tire would be 191! I get there’s slip to account for but most aren’t going to utilize that kind of rpm with a street gear IMO.