so the numbers from here are http://www.mazzurisuper.com/images/is250_dyno.jpg
+31.4tq
+24.3hp
on the IS250

We have an IS350 dyno'd which should get the same numbers, and it's actually dyno'd -1hp? Did I miss something reading above? Toptier can drive his car 1000 miles and he is not going to somehow come up with 25hp. What did mazzuri say about the dyno results on the 350?

Toptier thanks for documenting everything.

 

Here is what he said before any 350 was dyno'd.

"After seeing the final numbers I was able to pull out of the 250, I don't think I need to dyno the 350 to know it will make well over 30 whp and I would say over 40 wtq."

"After seeing the final results from the 250, I no longer have any plans to dyno the 350. I am very confident it will make huge numbers."

 

that is no good we want some real numbers.... thats the only thing stopping me from buying these lol i wanna know what kinda numbers im spending this kinda money on

 

so what the heck is going on? Im really confused. Some people are saying let the headers break in on the 350 then dyno it and some people are saying if no results came up after the first dyno, then nothing's gonna change....I dont see how the headers can give such massive gains on the 250 and actually hurt the gains on the 350.....can someone enlighten me?

 

I tried helping out around post# 105..

.. but I was ignored.!

 

I'm taking an edjucated guess but.... the 250's have a 'swirl control' feature built into the intake manifold. This, along with the VVT-i that both the 350 and 250 have is used to give the 250 a flat torque curve starting in the lower RPMs and up. I don't believe that the 350 has or needs this 'tuning' feature.

Is it possbile that the 350 engine can't make use of the increased exhaust flow due to a tuning (resonance) issue?

I have always though that the 350 engine was near perfect as it has power like a much bigger motor. Maybe there is just little room for improvment? There is a lot of common intake and exhaust parts used on the 250 and 350. Since the 350 is a bigger displacment, these common parts used on the 250 would be less then ideal without some tuning (restricting) to make them work well.

Just a thought. A final dyno tune of the 350 headers may shed some light on things.

 

The 2GRFSE is nowhere near "perfect" when you compare it to the 8 year old Honda S2000 that produces over 30% more power per liter.

 

Yea, i guess the 2GR-FSE would need to make over 100hp / liter to back up my claim. Maybe class leading power would be a better claim.

 

Yeah you did actually.

 

If it even made 90 hp / liter ...

 

bottom line is this product WILL NOT sell if there's no hard numbers for the 350s.

 

two ways to look at it. The product will sell because the numbers are great for the 250. Every is250 person out there wants to make their car faster, and this one dyno of mazzuri's is good for that car.

The one caveat is that the 350 owners typically seem to be the more willing to actually test and try new things on their car. Whether it's putting NOS, Superchargers/custom exhaust work, whatever. It's always the 350 dudes that first implement these changes. I know there is a demand for this product for the 350 owners for sure.

I guess from a manufacturing point of view you have to look at which market has more potential. Isn't there 9 is250's for every 1 350 made?

 

I do agree with you. I am very interested as well. However, I believe if you're going to make the header for the 350 then you need to prove that it's worth the 800 or whatever it cost and not base on the gain from the 250. For example, JoeZ pipe...the product was dyno'd proven for both 250 and 350 and it's selling like a hot cake.

any 250s dyno'd their car with the headers? I really hope it gained as much as what mazzuri claimed.

 

What is this swirl control feature thy speak of? doth my car haveth it? how can one tell? (is300 Mid east spec) ?

 

the "Swirl Control" is holding your head steady to keep it from spinning from all the talk back and forth on this thread about whether the headers will improve an IS350.