Thread: MZX 4-1 stepped header install

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2011-07-05 07:54:42

#21

Doctor G

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I think a lot of people forget to change exhaust cam timing with a new header as well. The flow of the header will require different exhaust valve timing to match.

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'93 Sentra - Full build thread here: http://www.nissanownersclub.co.za/forum/viewtopic.php?t=13186
'11 E92 335i Coupe DCT - daily

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2011-07-05 13:27:04

#22

wizaRd

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Originally Posted by alex_b13

That header looks great hope to see some good numbers man. they look similar to fujis but the fujis are not 4-1. What grade octane are u going to use?

Thanks Alex! I gotta tell you that costarrican fuel is quite polluted and due to that octane grades are not that high, 91 octane grade will be the one for this Daily Driver setup.

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2011-07-05 13:28:58

#23

wizaRd

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Originally Posted by nismo
Hey Im a newbie here but I purchased one the these header a couple months ago. Im was running a stock sr20vvl with stock cams and 3" exhaust all the way thru( no resonator) I dyno tune before header and got 188whp then install header and got 200whp. The dyno read high so the numbers to me wasnt real but I actually saw about 10-12 whp gain.

Here are some pics:

Graph after the header on pump gas

Sorry I cant find the graph for the run before the header.

Nismo Anju: What kind of electronic device you used on your setup? Piggyback, chipped daughterboard or EMS? Thanks bro, peace out!

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2011-07-05 13:31:29

#24

eguillenv

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Originally Posted by wizaRd

And now you are making me doubt about what I bought however, my objective here was not to create any controversy, just looking for further steps to have in mind in case this doesn't really fill all my expectations when hit the dyno.

Will come back to you guys when tuned charts are done and numbers set, I hope to pass my humble 200whp power band goal on a stock bottom end N/A engine. Down here is not happening quite frecuently as it's all over the world Thanks again!

...Tic Toc....Tic Toc... a fellow fan of that Sunny B13 NeoVVL and waiting for this Dyna Day to come (T-11 days) and after that my first ride on a NeoVVL over 200WHP. Can't Wait!

Expectations, not only on me and in STRT, but on Wizard are really hight (Hoping to see the hardest Legal NeoVVL over 200WHP in CR). Personally hoping to get 210-215 WHP. As you can notice expectations are way way over!! for this project.

Over the past months i started to gain thirsty for a NeoVVL and this will be my push towards it...

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2011-07-05 14:29:40

#25

nismo anju Online/offline status of nismo anju is unknown

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Originally Posted by wizaRd

Nismo Anju: What kind of electronic device you used on your setup? Piggyback, chipped daughterboard or EMS? Thanks bro, peace out!

Im using chipped ECU with an Evil vcon and on that run vvl was activated at 5200 rpm.

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2011-07-05 15:09:58

#26

Teal97

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Originally Posted by nismo
Im using chipped ECU with an Evil vcon and on that run vvl was activated at 5200 rpm.

looks like cams were switched separately @ 5200/5800. if so, try lowering the second switch point by 2-300 rpm to eliminate the dip.

gl

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2011-07-05 16:20:05

#27

wizaRd

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Originally Posted by nismo
Im using chipped ECU with an Evil vcon and on that run vvl was activated at 5200 rpm.

Good to know, and thanks for sharing...I'll be setting this up using MS II, VVL activation points are now set to crossover @ 5000rpm (both) but that's must be tested so we can match the best points where engine feels better.

Couple of weeks left, will keep ya'll posted, thanks again for your comments.

Last edited by wizaRd on 2011-07-05 at 19-34-58.

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2011-07-05 16:20:44

#28

jer_760

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Originally Posted by eguillenv

...Tic Toc....Tic Toc... a fellow fan of that Sunny B13 NeoVVL and waiting for this Dyna Day to come (T-11 days) and after that my first ride on a NeoVVL over 200WHP. Can't Wait!

Expectations, not only on me and in STRT, but on Wizard are really hight (Hoping to see the hardest Legal NeoVVL over 200WHP in CR). Personally hoping to get 210-215 WHP. As you can notice expectations are way way over!! for this project.

Over the past months i started to gain thirsty for a NeoVVL and this will be my push towards it...

With those mods, you will not get anywhere close to 215whp unless your dyno is way off. 200whp is doable and would be an accurate number though.

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2011-07-05 18:27:02

#29

enoehttemi Online/offline status of enoehttemi is unknown

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Does Mazworx still make these headers
and one thing i don't get people did not make the numbers they wanted from this header is it so hard to fix what wrong with it as in Length or size pipe

Last edited by enoehttemi on 2011-07-05 at 18-31-49.

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2011-07-05 19:13:35

#30

Vex630

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