Compression Elbows: GReddy vs FEED
#1
Compression Elbows: GReddy vs FEED
Hello All,
So I have seen many posts in which people are asking if there is any value in spending ~$400 on the FEED elbow vs ~$100 on the GReddy one, but never an actual comparison, so here goes!
I purchased both and from what I see, other than having a brand preference, there are two major benefits to the FEED elbow:
1) The FEED elbow is 2 5/8" internal diameter at the entry vs the GReddy at 2 1/2".
2) The FEED elbow bulges to a much larger internal diameter and has a much smoother curve. In addition the way the elbow is shaped will produce a much better flow into the throttlebody, see pictures below (FEED is on the "top" or "right" of the photos).
In my opinion the FEED elbow is superior to the GReddy one. However, I think the $300 price difference is better spent elsewhere.
So unless you are a FEED obsessive I believe that this part will only be worthwhile to the few people who are really pushing their setup hard.
Thanks for reading, any questions welcome.
Tom
So I have seen many posts in which people are asking if there is any value in spending ~$400 on the FEED elbow vs ~$100 on the GReddy one, but never an actual comparison, so here goes!
I purchased both and from what I see, other than having a brand preference, there are two major benefits to the FEED elbow:
1) The FEED elbow is 2 5/8" internal diameter at the entry vs the GReddy at 2 1/2".
2) The FEED elbow bulges to a much larger internal diameter and has a much smoother curve. In addition the way the elbow is shaped will produce a much better flow into the throttlebody, see pictures below (FEED is on the "top" or "right" of the photos).
In my opinion the FEED elbow is superior to the GReddy one. However, I think the $300 price difference is better spent elsewhere.
So unless you are a FEED obsessive I believe that this part will only be worthwhile to the few people who are really pushing their setup hard.
Thanks for reading, any questions welcome.
Tom
Last edited by TomSmy; 04-01-17 at 07:03 PM.
#2
Rx7 Wagon
iTrader: (16)
Looks like the FEED has a tube cast in for the AWS system, which might be nice for those trying to keep it somehow.
The difference in ID at the entry might be from the "step" in the Greddy design to work with couplers and the rest of their pipe kit.
Tough to armchair the air flow analysis, but the more gradual inner curve of Greddy might help with air flow to the front throttle blade.
Looks nice, though. The FEED one definitely stands out from the crowd.
The difference in ID at the entry might be from the "step" in the Greddy design to work with couplers and the rest of their pipe kit.
Tough to armchair the air flow analysis, but the more gradual inner curve of Greddy might help with air flow to the front throttle blade.
Looks nice, though. The FEED one definitely stands out from the crowd.
#3
Hopefully it shows in the pictures (is very obvious in person) - the big difference between the two for flow, is that the inside of the FEED curved section is way wider, the "bottom" is much lower and kind of bulges down.
Both are great items and the GReddy really is awesome value for the price point.
Last edited by TomSmy; 04-01-17 at 09:51 PM.
#6
RX-7 Bad Ass
iTrader: (55)
I don't know if this would make THAT big of a difference power-wise. I think a lot of it is aesthetic.
Probably a few horsepower on the top end IMHO. I think the real value is having the cool, rare part and it looks cooler .
Dale
Probably a few horsepower on the top end IMHO. I think the real value is having the cool, rare part and it looks cooler .
Dale
#7
endless build
iTrader: (15)
Nice comparaison Tom!
I was always wondering if there was a difference.
I agree with those Gentlemen's.
I feel like that's one of parts that never got "changed" in 20years of technology and wayyy oversell due to its unbeatable price.
I mean 99% of the time buddy pop his hood it's a Greedy elbow
There was also the HKS version.
I also found this , but it might of simply got cut
Anyways
The Rotary-works is nice because it's 3"
BUT it's shitty that it need some cutting to fit.
I mean , no one ever taught of having a 3" Elbow
That's fits directly , no cutting ?
I was always wondering if there was a difference.
I agree with those Gentlemen's.
I feel like that's one of parts that never got "changed" in 20years of technology and wayyy oversell due to its unbeatable price.
I mean 99% of the time buddy pop his hood it's a Greedy elbow
There was also the HKS version.
I also found this , but it might of simply got cut
Anyways
The Rotary-works is nice because it's 3"
BUT it's shitty that it need some cutting to fit.
I mean , no one ever taught of having a 3" Elbow
That's fits directly , no cutting ?
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#9
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#13
Beyond
iTrader: (36)
Yeah, this CF piece elbow is really expensive, and one of a kind.
??????????? ?RX7? - LEG MOTOR SPORT???????
The website stated approx a 10hp gain though,
??????????? ?RX7? - LEG MOTOR SPORT???????
The website stated approx a 10hp gain though,
#16
I'm only asking questions
iTrader: (6)
Have there been comparison studies done with these aftermarket elbows and OEM?
I haven't searched yet, but was wondering.
Quick results: but looking for others
https://www.rx7club.com/single-turbo...lastic-420777/
I haven't searched yet, but was wondering.
Quick results: but looking for others
https://www.rx7club.com/single-turbo...lastic-420777/
Last edited by MK3Brent; 04-05-17 at 03:42 PM.
#20
Senior Member
iTrader: (7)
If you're at the track running lap after lap, or you're sitting in stop and go traffic for an extended period, you will have heat soak, no matter what materials you're using. The added cost to prevent heat soak in a two or three foot section of intercooler piping, isn't merited.
Having said all that, the carbon fiber looks really cool, save for the fact it's the only carbon piece in the system. If you had all carbon fiber for all the piping and maybe the UIM, it'd look sick. But, the one piece just looks out of place to me.
Nick
#22
Senior Member
iTrader: (7)
To answer your question though, yes the engine bay heat will radiate into the intake and have an effect on the AIT's. But, again because it heats up quickly, it also cools down quickly. So, as long as you have an efficient intercooler that's cooling that charge well enough, the aluminum piping will cool relatively quickly and thus the effect of the heat soak will
be lessened.
Having said all that, a little methanol injection would cure all of this and make whatever material you chose almost irrelevant.
Nick