Who makes the best 5VZ-FE headers?
12-10-2008, 02:01 PM
#21
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Oh, in that case get the headers FOR SURE! You will HATE yourself if you don't get them now and then have to install them while the engine is in the truck.
12-10-2008, 04:37 PM
#23
Contributing Member
Otherwise the design is about as good as you can get, plus they also fit.
TRD is way overpriced IMO, i have never been a fan of TRD proudcts except the superchargers.
12-10-2008, 06:44 PM
#24
Thats the best reason for headers/exhaust work. You might only gain a few horses in the lower range, but it evens out the torque/hp curve that plagues the 5vz.
I'd rather have a flatter tq/hp line than a higher PEAK tq/hp line.
I dont like revving my engine over 4000rpm to get top power out of it. If I wanted a high revving engine, I'd get a small car.
I'd rather have a flatter tq/hp line than a higher PEAK tq/hp line.
I dont like revving my engine over 4000rpm to get top power out of it. If I wanted a high revving engine, I'd get a small car.
12-10-2008, 08:42 PM
#25
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Reason or not, the dyno says that it gets power from idle on up.
12-11-2008, 08:53 AM
#26
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Thread Starter
Ok, so where is the cheapest place to buy top of the line Doug Throley headers? I want to compare them with Downey. i dont think i will use TRD because of the price.
12-11-2008, 08:56 AM
#27
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12-11-2008, 09:10 AM
#28
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Let's see the dyno plots for the Thorley headers on some NA trucks!
I'm semi interested in these. A nice gain of 10-15hp would be pretty nice IMO, and would really improve the day to day driving characteristics of these engines.
I'm semi interested in these. A nice gain of 10-15hp would be pretty nice IMO, and would really improve the day to day driving characteristics of these engines.
12-11-2008, 09:25 AM
#29
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I just wish i had saved the dyno i did see.
12-11-2008, 10:07 AM
#30
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They ran it on my truck when it was NA search here in the group buy thread and you should find it. It is also on CT. If i grab my laptop out of the 4-runner i will post it
12-11-2008, 02:55 PM
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12-11-2008, 03:16 PM
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12-11-2008, 03:21 PM
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12-11-2008, 04:30 PM
#35
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Read the dyno below, i now have it saved so i can post it when this comes up next time.
Plus with tuned headers you will get gains thoughout, these were not designed to be tuned that i know of but it looks like they lucked out and hit at least part of the tuning sweet spot. Which is why it has gains from idle on up.
You are correct that extra flow alone doesn't help much down low, but tuned header on the other hand can help a lot.
12-12-2008, 10:21 AM
#36
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Thread Starter
Now here is my problem...Doug Thorley Headers have the crossover pipe which you all know causes problems with the swap into 2nd gens. Where as Downey Headers permit me to run two pipes separate from each other and no crossover needed. So is it worth the hassle to get Doug Thorley Headers?
12-12-2008, 11:05 AM
#37
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Now here is my problem...Doug Thorley Headers have the crossover pipe which you all know causes problems with the swap into 2nd gens. Where as Downey Headers permit me to run two pipes separate from each other and no crossover needed. So is it worth the hassle to get Doug Thorley Headers?
If you are putting it in a 2nd gen you might want to go with another brand.
12-12-2008, 04:07 PM
#39
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