JBA headers on a 2006 tundra

Search again here and in the engine forum. You loose low end torque with the jba's on the newer vvti engines. How often are you driving around at 4k rpms? Check jba's torque/hp curves for the 05 and 06 and see where the 21 or so hp gain is located. About the only thing to do with these engines is replace the muffler, unless someone designes a long tube header.

jkib said:

Search again here and in the engine forum. You loose low end torque with the jba's on the newer vvti engines. How often are you driving around at 4k rpms? Check jba's torque/hp curves for the 05 and 06 and see where the 21 or so hp gain is located. About the only thing to do with these engines is replace the muffler, unless someone designes a long tube header.

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--I've wondered about these and other aftermarket headers myself. While I would hate to lose low end torque and horsepower, I would think the gain at the higher end of the rpm range would be ok, though. While I don't always drive at 4k rpm, I would think a gain of 20+ HP would be beneficial when passing on the highway. Would these header be beneficial in the long run? I don't know. I figure I will keep mine stock. Good luck!

P.S.
Why did the 2006 Tundras lose HP and Torque from the 2005? I just noticed it lost 11 HP, and 12 Ft. lb. Torque. What can be done to "get back" that lost power?

Correct me if im wrong, but isnt what appears to be loss in low end just the dyno operator being light on the throttle to avoid downshifting?

According to JBA the dyno figure discrepancy on their website is due to the trans risking to kick down at lower rpms, so they couldn't put their foot into it as much as with the stock manifolds. Apparently they did a 3rd gear pull with it. To their defense there's no way you can loose that much low end with the headers.

Nonetheless, their headers primaries are too large for the lower rpms. They don't make any more low end power than the stockers, but they do increase the midrange torque considerably. This isn't a surprise because of the stock manifold's poor design. It's pretty clear bean counters were involved with the design process here.

The JBAs are your only option if you have a vvti 05/06. Stay tuned, because i'm going to change this situation in the near future - won't be cheap, but it'll be done right.

It is nice to finally see some folks quoting some facts and not the tired old answer about losing low end performance. VVTI V8 engine only comes with a auto tranny. You can't stomp on it in the low end without it down-shifting and throwing the dyno readings off. The added performace even in the low end would make it easier to downshift. The reason JBA had to 'roll in' the power which makes it look like the low end power suffered. I don't know anyone that has really driven an VVTI engine before and after JBA header installs thinks they lost any low end power. The JBA's along with hi flow Magnaflow (or other performance muffler) makes for a great addition to any VVTI engine!

:tu: Hi, BBKid. I bit the bullet and ordered a set today for my '06 4X4 Access Cab. Hopefully, they will be in by this Friday, but more than likely they will get in Monday or Tuesday, because they are shipping from Florida. Heck, as soon as I get those babies on, I will be posting about them, haha! This will be it as far as engine enhancements go. I put on a longer echo tip today, haha. Later.

I don't know about losing any low end, but I can feel the perfomance boost throughout on my 05 DC. I'm thinking of having my truck put on the dyno to see what it can really do. JBAs are a plus.

so anyone dyno their 05+ tundra yet? and did the 05 vvt-i tundras really have more power?