MEVI vs stiock intake manuifold porting
11-23-2002, 09:05 AM
#1
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MEVI vs stiock intake manuifold porting
Would it be possible to get greater flow through porting the stock intake manifold, than getting the MEVI? Are there any numbers to compare or has anyone got an EFI intake porting done on their Maxima?
11-23-2002, 09:39 AM
#2
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Re: MEVI vs stiock intake manuifold porting
Originally posted by speedemn
Would it be possible to get greater flow through porting the stock intake manifold, than getting the MEVI? Are there any numbers to compare or has anyone got an EFI intake porting done on their Maxima?
Would it be possible to get greater flow through porting the stock intake manifold, than getting the MEVI? Are there any numbers to compare or has anyone got an EFI intake porting done on their Maxima?
11-23-2002, 09:47 AM
#3
Keven97SE had an extrude hone intake manifold, but got rid of it for his MEVI. I imagine an extrude hone MEVI would flow better than an extrude hone OEM manifold though because you get the extra advantage of the resonance at the top end.
-hype
-hype
11-24-2002, 09:28 AM
#4
Originally posted by xHypex
Keven97SE had an extrude hone intake manifold, but got rid of it for his MEVI. I imagine an extrude hone MEVI would flow better than an extrude hone OEM manifold though because you get the extra advantage of the resonance at the top end.
-hype
Keven97SE had an extrude hone intake manifold, but got rid of it for his MEVI. I imagine an extrude hone MEVI would flow better than an extrude hone OEM manifold though because you get the extra advantage of the resonance at the top end.
-hype
11-24-2002, 10:24 AM
#5
But didn't the Extrude Honed manifold only give him a couple of hp according to the dyno? He was the one who said it wasn't really worth it I think. That the extra flow wasn't worth it and that the runners were just too long.
Originally posted by Nealoc187
By the same token, Keven's extrude honed USIM made him one of the most powerful 4th gens on the dyno. No doubt the longer lasting power of the MEVI is superior but he put up some very good numbers with the USIM extrude honed.
By the same token, Keven's extrude honed USIM made him one of the most powerful 4th gens on the dyno. No doubt the longer lasting power of the MEVI is superior but he put up some very good numbers with the USIM extrude honed.
11-24-2002, 11:34 AM
#7
The stock manifold even extruded and honed is not going to change the loss of breath in high rpm's. The overall band would get a couple of extra HP but it won't have gains like the VI. We're talking on average about 30 HP.
11-24-2002, 02:03 PM
#8
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- The only thing that the Extrude Hone process does is smooth everything down. On a Naturally Aspirated engine, this allows for a very, very slight increase in air velocity. If you've got the money to spend and you've already done everything else, then this is an okay thing to do. But, for the most part, it isn't worth the price.
- However, on a Forced Induction car, the smoothed over runners help to keep the intake air temperatures down. As you know, the denser/cooler the charge, the more power you can make. Extrude Honing is definitely worth it on a FI car.
- There are a number of turbocharged Miata's that have had their manifolds extrude honed and they got some very nice gains because of the cooler intake charge. Check out www.miata.net if you'd like to research it yourself.
- However, on a Forced Induction car, the smoothed over runners help to keep the intake air temperatures down. As you know, the denser/cooler the charge, the more power you can make. Extrude Honing is definitely worth it on a FI car.
- There are a number of turbocharged Miata's that have had their manifolds extrude honed and they got some very nice gains because of the cooler intake charge. Check out www.miata.net if you'd like to research it yourself.
11-25-2002, 07:49 AM
#14
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Sorry I'm jumping into this thread so late...
You can check out my dyno plot in my sig below for the results of the extrude honed intake manifold. What it did was slightly shift the resonance points to a higher rpm (~3-400 higher) and made the torque peaks higher. The car pulled a little harder than with the stock manifold. However, for the $550 price it wasn't a good bang for the buck. For $250 or so it might have been a better value.
The MEVI is worlds better than the EH intake. Although the peak torque is slightly less than with even the stock US manifold, the high-rpm gains are sooooo large it easily makes it the manifold of choice. On a steady-state flow bench, the stock US manifold flows a little better than the MEVI due to the turbulence below the butterflies on the MEVI. However, the resonance frequency of the MEVI is much higher once the butterflies are opened, so the MEVI will dynamically flow better at high rpms than the US manifold. An engine flows in a very on/off manner (dynamic). Steady-state flowbenches don't tell you much of anything when it comes to intake manifolds.
One thing I would like to see is an EH'd MEVI. I do think that performing that would help recooperate some of the torque loss. However, again I think it would be a poor value in terms of HP/$.
You can check out my dyno plot in my sig below for the results of the extrude honed intake manifold. What it did was slightly shift the resonance points to a higher rpm (~3-400 higher) and made the torque peaks higher. The car pulled a little harder than with the stock manifold. However, for the $550 price it wasn't a good bang for the buck. For $250 or so it might have been a better value.
The MEVI is worlds better than the EH intake. Although the peak torque is slightly less than with even the stock US manifold, the high-rpm gains are sooooo large it easily makes it the manifold of choice. On a steady-state flow bench, the stock US manifold flows a little better than the MEVI due to the turbulence below the butterflies on the MEVI. However, the resonance frequency of the MEVI is much higher once the butterflies are opened, so the MEVI will dynamically flow better at high rpms than the US manifold. An engine flows in a very on/off manner (dynamic). Steady-state flowbenches don't tell you much of anything when it comes to intake manifolds.
One thing I would like to see is an EH'd MEVI. I do think that performing that would help recooperate some of the torque loss. However, again I think it would be a poor value in terms of HP/$.
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