The 5.7 gen Maxima Latest dyno= 301.58HP 277.27 TQ Closed cutout, stock cams.....
I would assume you've done a wonderful job on the fuel tuning so I wouldn't say it was that. When I see chart go flat my first thought is airflow restriction. Perhaps there isn't much you can do about it idk. Something is obviously hitting peak air velocity. The question is what exactly is it? One guy mentioned the intake manifold, yes perhaps it could be. or it could be other things. We're all here to learn from each other by exchanging ideas. I am only curious.
Yeah, Id like to get a custom intake manifold with a 87 or 90 dbw TB. But I can say for stock the 09 intake manifold is INSANE. It flows great even a stock 09 i/m with vias and all that.
Also going from 3.5 to 4" intake pipe did not change the flatness at all. It just pushed the whole line up!
I would like to see what this can do with stock cams though! longtubes and custom i/m could really push it far.
http://www.sg-motorsport.com/?p=1110
The 2ed graph shows:
So the first step was to free up the intake and add long-tube headers. This is what our race engine looked like with stock cams, longtube headers and an open intake:
From 6000 rpm on its relatively flat power. Even with cams.
It was not untill they used a different intake manifold that after 6k it started making more power, then as they rev further and use ITbs it really takes off after 6k
Thing is they started out with long tubes so as that starting point, the intake manifold is pretty much what makes power after 6k rpm. Once you can rev to 8k you really have to let it breathe to make more power.
All that means $$$$$$$$$$
The 2ed graph shows:
So the first step was to free up the intake and add long-tube headers. This is what our race engine looked like with stock cams, longtube headers and an open intake:
From 6000 rpm on its relatively flat power. Even with cams.
It was not untill they used a different intake manifold that after 6k it started making more power, then as they rev further and use ITbs it really takes off after 6k
Thing is they started out with long tubes so as that starting point, the intake manifold is pretty much what makes power after 6k rpm. Once you can rev to 8k you really have to let it breathe to make more power.
All that means $$$$$$$$$$
Yeah, Id like to get a custom intake manifold with a 87 or 90 dbw TB. But I can say for stock the 09 intake manifold is INSANE. It flows great even a stock 09 i/m with vias and all that.
Also going from 3.5 to 4" intake pipe did not change the flatness at all. It just pushed the whole line up!
I would like to see what this can do with stock cams though! longtubes and custom i/m could really push it far.
Also going from 3.5 to 4" intake pipe did not change the flatness at all. It just pushed the whole line up!
I would like to see what this can do with stock cams though! longtubes and custom i/m could really push it far.
Granted on Surra's car you might see a larger gain as he is pushing out roughly 15% more air than most NA. But for anyone without the engine swap I think the gains would be marginal at best. If you arn't sucking in more air there is no need to have a larger exhaust. To suck in more air you need cams and a better IM. Both the new headers, cams, and a custom IM are basically the same price. Cams would make more sense as the exhaust as it is already upgraded imo. He can always throw on a 3'' Y pipe for small money if he really feels the exhaust starts to be a restriction. Everything I have read on our motors leads me to believe the real restriction is getting air in, not out. Hence the massive cams and crazy intake manifolds SG used and everyone else uses who make high NA HP numbers. The Fontana 350z basically proves that as well.
Surra have you contacted GTM for cam advice? Or just JWT?
Last edited by FastnFuriousMax; Jul 9, 2012 at 06:49 AM.
Thanks for the info....
If those are ever built I don't think we will see huge gains personally. If you compare maxima w/ Cattman against a 350z with longtubes they are close enough imo not like there are huge differences...
Granted on Surra's car you might see a larger gain as he is pushing out roughly 15% more air than most NA. But for anyone without the engine swap I think the gains would be marginal at best. If you arn't sucking in more air there is no need to have a larger exhaust. To suck in more air you need cams and a better IM. Both the new headers, cams, and a custom IM are basically the same price. Cams would make more sense as the exhaust as it is already upgraded imo. He can always throw on a 3'' Y pipe for small money if he really feels the exhaust starts to be a restriction. Everything I have read on our motors leads me to believe the real restriction is getting air in, not out. Hence the massive cams and crazy intake manifolds SG used and everyone else uses who make high NA HP numbers. The Fontana 350z basically proves that as well.
Surra have you contacted GTM for cam advice? Or just JWT?
Granted on Surra's car you might see a larger gain as he is pushing out roughly 15% more air than most NA. But for anyone without the engine swap I think the gains would be marginal at best. If you arn't sucking in more air there is no need to have a larger exhaust. To suck in more air you need cams and a better IM. Both the new headers, cams, and a custom IM are basically the same price. Cams would make more sense as the exhaust as it is already upgraded imo. He can always throw on a 3'' Y pipe for small money if he really feels the exhaust starts to be a restriction. Everything I have read on our motors leads me to believe the real restriction is getting air in, not out. Hence the massive cams and crazy intake manifolds SG used and everyone else uses who make high NA HP numbers. The Fontana 350z basically proves that as well.
Surra have you contacted GTM for cam advice? Or just JWT?
Senior Member
Joined: Jun 2011
Posts: 1,218
From: Mississauga, ON, CANADA
WOW! another sick build! +dyno :D
just got into the max world with my 00vi swap, started thinking about vq35 swap and now this... it never ends! awesome
2nd gen rwd vg30det build, "07vi" swaps, 5.7 swapped maxima. I love maxima.org!!!
2nd gen rwd vg30det build, "07vi" swaps, 5.7 swapped maxima. I love maxima.org!!!
even though he is auto
I'm really impressed with the 5.7th gen setup, and that will be a target if I get to the point of my 03 being a problem....with the Haltech tuning it really turns that 7th gen engine into a World Class sprinter, I'm sure that setup can reach 325-350 without cams or even larger headers tubes....I'm, sure with a little bit of port clean up those numbers can be reached along w/Haltech..congrats and keep doing it dude...
I'm really impressed with the 5.7th gen setup, and that will be a target if I get to the point of my 03 being a problem....with the Haltech tuning it really turns that 7th gen engine into a World Class sprinter, I'm sure that setup can reach 325-350 without cams or even larger headers tubes....I'm, sure with a little bit of port clean up those numbers can be reached along w/Haltech..congrats and keep doing it dude...
Thanks man! It sure was worth all the work Ive put into it. It could benefit from a more experienced VQ + Haltech tuner but for now its fine. The Long term goal is 350whp n/a. That could be 2+years away though aha.
They have to be HR Specific cams (due to trigger wheel differences). what do you have?
thanks!
seems fine, i do want to get a thermostatic cooler one day.
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