Its sitting in my room waiting to get installed and I was wondering before I put it in if it would be benifitial to have it extruded and honed before it was installed while its out ? I know there are some gaines with doing this to the stocky manifold but what about the VIM

-Matt

 

What gains exactly did you think the stock manifold got from EH?

 

Maybe he is referring to this dyno result:
http://forums.maxima.org/showthread....hreadid=135169

 

Could be. That's the only data I've got too.
Kev sent me an e-mail last summer when I asked about his gains.

"It sounds good until you look at the dyno chart. The gains are almost strictly in the 4400-5400 rpm range, with only minor increases before and after. Take a look at my dyno plot and you'll see. It'd probably be worth $200-300, but nowhere near the $550 or whatever it was I paid. The middle east variable intake is a wayyyyyy better modification...it's on it's way!"
Keven97SE

So would EHng the MEVI be limited to the same narrow range?

 

Apparently, the USIM was resonance tuned to work optimally at several resonance frequencies. The big jump on Kev97Se's dyno seems to suggest that the honing and extruding enhanced all the resonances, especially the last one. So, if you extrude hone an MEVI, the different range of resonances should be enhanced. In other words, where the MEVI really shines, from 5200 on up, even past redline, the power should increase. But is it worth all that money?

If you're going for that magic number, 200 whp, then I guess every little bit helps. 200 wheel hp on a 4th gen is like the sound barrier, the closer you get to it, the more you have to spend to actually reach it.

DW

 

I think that we're all aware now that one of the shortcomings of the VIM is that the torque peaks are neutered somewhat. I believe this is due to the VIM having weaker resonance energy compared to the US manifold due to turbulence and expansion waves at the secondary "tees". Extrude honing is a way of increasing the resonance energy via fluid friction reduction at the walls. I would therefore guess that EH'ing the VIM would reclaim some of those neutered torque peaks. You would likely see a good little torque peak at 3400 and 4500 rpm just like stock. Also, you can see from my EH US manifold dyno that high-rpm torque (>5000 rpm) was bumped up 8-10 ftlbs pretty consistently. I think one could assume the same would happen with a VIM, only in this case it would yield a 10-12 HP gain due to the higher peak HP rpm (~6300 rpm). This would certainly be one of the mods that could finally allow a N/A 4th gen Maxima to hit 200 FWHP.

Still, I think the overall benefit would be similar to what I saw on my US manifold, and in my opinion the gains would therefore not be high enough to justify the high price. It's damn expensive and you'd have to be without the car for a week since there certainly won't be any cores available.

 

Not necessarily

 

I have two USIM sitting in my attic if anyone needs any to do this mod PM me

 

Here's Keven's dyno. IMO, the gains are impressive and they're right where you want them....smack dab in the midrange and topend of the operating range.

 

By the VIM you mean MEVI or 2kv1?

 

matty after lookin at your pic I was curious about something, this is off topic but arent you suppose to use t clamps on boosted plumbing for a better seal?

 

judging by the date of this thread they are talking about the MEVI.

 

What's with raising all these threads from the dead lately? Seems like it's been happening alot.

 

is it even possible to extrude hone a mevi since there are butterfly valves. And if you extrude hone the whole thing then those clearances will not let the valves close the path fully? is it possible to EH the 00VI?

 

They don't seal it off fully anyways. They are far from airtight.

 

Holy old thread batman!