View Poll Results: Going from 2in exhaust,to a 3in, longtube header, 2.25 Ypipe,on 8000K ITB Rev make?
1-5WHP
10
12.66%
5-10WHP
17
21.52%
10-15WHP
13
16.46%
15-20WHP
20
25.32%
20-30WHP
19
24.05%
Voters: 79. You may not vote on this poll
Kevin's VQ35DE NA Build Epilogue..
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I finally understand your graph now! I've been wondering what the top dyno run connected to below 5k, but it's basically you plotting it based on your other video.
It's really interesting that both setup realizes max power at a very similar rpm and by looking at your previous manifold I noticed that it's a log style one. It seems that the entire power curve is just shifted upwards by 20-25whp, is that also true down low? I would have expected a more gradual increase in power as rpm climbs. Too bad you don't have a torque curve on there.
It's really interesting that both setup realizes max power at a very similar rpm and by looking at your previous manifold I noticed that it's a log style one. It seems that the entire power curve is just shifted upwards by 20-25whp, is that also true down low? I would have expected a more gradual increase in power as rpm climbs. Too bad you don't have a torque curve on there.
The cams are a limiting factor too though, small cams 261s. Its basically an increase in the entire powerband. And extending the power out further in the rpm. VS the restrictive stock IM where power peaks and drops immediately.
At first I was expecting a drastic change in peak power location similar to the car that Injected did with the ITB, where it saw a lateral shift of 1000 rpms. Your car didn't exhibit this but the peak power and the way the power drops off on your car and theirs are almost identical with the ITB. His BC272 cams wouldn't be considered too large by any means either and on top of the 4.15L displacement it would be considered even less so. It just seems that the stock log like manifold on your maxima engine seems to be quite rev friendly. Do you plan to swap out the cams any time soon?
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From: WA
At first I was expecting a drastic change in peak power location similar to the car that Injected did with the ITB, where it saw a lateral shift of 1000 rpms. Your car didn't exhibit this but the peak power and the way the power drops off on your car and theirs are almost identical with the ITB. His BC272 cams wouldn't be considered too large by any means either and on top of the 4.15L displacement it would be considered even less so. It just seems that the stock log like manifold on your maxima engine seems to be quite rev friendly. Do you plan to swap out the cams any time soon?
I've done some research on using the maxima intake manifold on a Z. Has anyone here tried it? I've read about guys putting Z lower and uppers on there Maxi's and loosing power. Guy's with Maximas are easily putting 270 to the wheels with bolt ons, wondering if the manifold is a big contributor.
Putting on the Maxima manifold requires the lower and upper peice, lower has the fuel rail on it I believe. This along with the SSID modification might yield a better system than the stock 350.
Anyone wanna try?
Would most likely require an extensive re-tune to take advantage of it.
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From: South Florida
At first I was expecting a drastic change in peak power location similar to the car that Injected did with the ITB, where it saw a lateral shift of 1000 rpms. Your car didn't exhibit this but the peak power and the way the power drops off on your car and theirs are almost identical with the ITB. His BC272 cams wouldn't be considered too large by any means either and on top of the 4.15L displacement it would be considered even less so. It just seems that the stock log like manifold on your maxima engine seems to be quite rev friendly. Do you plan to swap out the cams any time soon?
I'll fine tune it though in the coming months when the shop has time and isn't busy as hell. I would do 290 cams probably if/when I do go back in
Keep in mind the front wheel drive powertrain is naturally more efficient at putting power down to the wheels. They can easily dyno 5% higher due to being FWD alone (dependent on dyno of course). Now, max's laying down over 300fwhp with their manifolds would be interesting.
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From: WA
Keep in mind the front wheel drive powertrain is naturally more efficient at putting power down to the wheels. They can easily dyno 5% higher due to being FWD alone (dependent on dyno of course). Now, max's laying down over 300fwhp with their manifolds would be interesting.
I've always been under the impression FWD trannys are less efficient. Maybe I've always assumed the FWD is an auto. Auto is less efficient obviously. But a FWD manual is more efficient than a RWD manual? Less drive train mass i guess.
Learn something new every day. Sorry for getting off topic.
No one with a Maxima intake mani on a Z?
Thanks
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With no means of getting cold air from outside the car (horns hover at the top of the hood), I had the hood vented to release all the heat rising to the top of the hood that the horns are sucking in. While running the car hard, the horns end up sucking up a ton of heat as you can see they're located right at the top. Intake temps entering the horns should see up to a 30degree temp drop because of the setup we're using. My wife picked out the design and the waterjet did the work. Gota get some mesh and we'll be good to go.
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Alright, just a little update. I made 315whp. On ebay shorty header, VQ30 ypipe, and a 2.25OD, around a 2in ID exhaust at its smallest choke point... Don't ask why I'm just an idiot for not measuring what I paid for 3 years back. Anyway long story short.
I'm pulling the motor out to correct a couple things while I'm pissed about the whole exhaust ordeal. A few photos to entertain the eyes.
Torn bushings in my control arms...
New stillen front sway bar while is is convenient to get to. My boy standing in the engine bay without motor haha.
Engine just hangin.
I'm pulling the motor out to correct a couple things while I'm pissed about the whole exhaust ordeal. A few photos to entertain the eyes.
Torn bushings in my control arms...
New stillen front sway bar while is is convenient to get to. My boy standing in the engine bay without motor haha.
Engine just hangin.
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Added a fun poll too. VOTE!
The question, I made it as short as possible to fit. The long version of the question is the following:
What will going from an ebay shorty header/VQ30 ypipe 1.90in I think or so, 2.25OD / 2in ID exhaust at its smallest choke hold TO an Altima long tube header, 2.25 Y-Pipe, and a 3in ID exhaust (1in ID upgrade) proper exhaust make on a cammed etc. 8000 revving ITB motor make?
Let me know your opinion! Should be interesting. Post your guesses on the HP difference. As you can see 315 whp was made on a choked motor... Let us see what she really makes with proper back pressure relief. Especially at 8k RPM, lota lota air flow there.
The question, I made it as short as possible to fit. The long version of the question is the following:
What will going from an ebay shorty header/VQ30 ypipe 1.90in I think or so, 2.25OD / 2in ID exhaust at its smallest choke hold TO an Altima long tube header, 2.25 Y-Pipe, and a 3in ID exhaust (1in ID upgrade) proper exhaust make on a cammed etc. 8000 revving ITB motor make?
Let me know your opinion! Should be interesting. Post your guesses on the HP difference. As you can see 315 whp was made on a choked motor... Let us see what she really makes with proper back pressure relief. Especially at 8k RPM, lota lota air flow there.
Last edited by kgkeen101; Jun 4, 2010 at 03:17 PM.