So much for the Blitz! $75 in the toilet.. Thanks Caymandive!

 

I really doubt any of the other drop in filters would yield different results than the Blitz filter. I'm not going to try K&N or any other filter that uses oil even if they did yield 1-2 more hp. Glad I did this test today even thought I was surprised by the results. I was really hoping to see at least 1 or 2hp gains or even better numbers throughout the curve, but didn't. Oh well. Time to throw the filter up on ebay and see who wants it.

Oh and something else I learned from this test. When I did the JOEZ intake dyno with the stock filter last time with close to 10k miles on it my results were damn near the same as today (within .25hp. That tells me that even with 10k miles on the stock filter it is still doing a very good job and Lexus engineered it well!

 

Kudos, cayman.

I'd like to encourage anyone who was thinking about getting the blitz to consider sending cayman $5 (which is a small % of what you would have spent.)

 

Thanks. Now I gotta get the Blitz filter up on ebay and see how much I can sell it for. It's brand new, so hopefully I can get $25+ out of it.

 

[QUOTE=caymandive]-

I'm assuming the OEM filter will protect my engine the best, but on the flip side since they are making almost identical numbers that maybe they are filtering almost identically. Thanks to all who contributed towards this dyno session. Always fun and interesting to see what the results yield.

[QUOTE]

 

Not really surprised... The exhaust is way more restrictive that the intake is so even if the Blitz or any other filter does flow better than the stock one, it makes little to no difference because the added flow goes widely unused.

 

You dont need to go that far to sell it.
https://www.clublexus.com/forums/sho...d.php?t=226019

Im sure you've seen this post about the second filter remove,that this people swears will give them HP maybe you can sell it to them they will probably gain more hp than you'll ever have since they only do BUTT dyno

hell for $25 i'll take it. my stock on's is so dirty and it cost $35 in the dealer.

pm if you serious

 

If increased flow out of the intake makes no difference due to the exhaust restriction, how do you explain the relatively significant gains from the Joe Z tube?

 

the only thing about that dyno that was done, the filters were being swapped quickly, from my experience it takes a car some time to adjust and those quick filter changes wouldnt show much of an increase...am i wrong?

 

I have to state that I am slightly confused now. I have two questions. First, I have researched the Joe Z intake and I was planning to buy one and add a Blitz filter. Now, correct me if I'm wrong, it appears that I would just get the intake and not the filter for some slightly increased performance. Right? Second, for those who have the Joe Z what difference do you actually feel regardless of numbers and is there a difference in sound. If so, please describe in your own words.
Thanks for your time.

 

4HP is significant??? Look at the gains you get from an exhaust, THAT is significant. If the exhaust gets freed up, the Joe-Z pipe would likely yield in an even higher gain.

I have the Joe-Z intake, the difference in sound is very very subtle. If you're not actually listening and paying attention to the difference in sound, you won't even notice it.

 

What are the gains from an exhaust. Plus, how does that change the sound. What exhaust do you have? thanks.

 

I don't have an exhaust... many others do though, maybe they can chime in... I can tell you that an exhaust will defiantly make a noticable difference in sound.

 

I was referring to the 250 which has a gain of 6rwhp w/ the Joe Z tube. That is a significant gain for just swapping out the stock resonator for a smoother tube. It's my understanding the 250 and 350 use the same exhaust system, you may free up some horsepower with a higher flowing exhaust but at the expense of torque, which maybe would benefit the 350 but I don't believe it would benefit the 250 w/ it's lower torque numbers being that the IS is relatively heavy for a small sedan.

You stated I should look at the gains you get from an exhaust, I imagine you are referring to the an IS exhaust? The only concrete dyno numbers I know showing an increase from aftermarket exahust is one system (I forget the brand) tfrom a post I read a while back hat basically is a race only set up, it does away with the cats...well duh, cut the cats out of any exhaust system and you have gains, but I'd rather not do something so drastic that has so much potential to violate my warranty. I'm thinking a throttle body port and some ecu reprogramming is our best bet...I would love to squeeze and extra N/A 20 horsepower out of my "little" 2.5 liter.

 

The 250 does not move as much air as the 350, so the exhaust isn't as big of a restriction which could very well be the reason for the added 2HP from the same intake setup.

As far as the cats are concerned, that is beside the point. Whatever the "reason" for the restriction doesn't matter, the fact remains that it is restrictive and any intake system you get will yield neglagable gains unless the other end is freed up. Again, weather you would want to remove cats or not is not the point. You not wanting to remove the cats does not make them any less restrictive.

Bottom line is having a free flowing intake with a restrictive exhaust is not going to get you much and vice versa. I am talking mainly about the 350 here, but the same principle holds true for any vehicle. The 250, if it is indeed using the same exhaust as the 350 has a bit of headroom before the exhaust would be as much of a concern.