Grenade180sx

i think the vvl head is a great thing it's one more solid part to put into these touchy SR's

JTunedMotorsports

i plan on running the mazworx. trans. turbo and vvl kit

not sure on the 63 or 82 ar

there kit is not available in twin scroll..they dont recomend it.

not sure i can run stock cams. n1, or 16s...hope for 500whp..dyno jet or like 480 dyno dynamics...i was thinking of keeping the rev to 9-9.5k so I dont have to shift in turns mid drift,

fyi i will have a fully build 2.0 bottom end
head. 3 angle. valves, springs, retainers, guides,

Chuvy

can you pm all info and price on the kit please.

juggernaut1

So you have happy engine dynos as well?

Based on the manufacturers power claims, the DD dyno's are spot on in terms of drivetrain loss.

For instance, Nissan quotes 147kw (197 hp) at the engine for an ADM S15 with SR20DET. On the DD they typically make 120rwks (160 rwhp) to 125rwks (167.5 rwhp) - so we're talking between 18% and 24% drivetrain loss here. Nothing unusual about that sort of drivetrain loss and nothing has melted on my s15 yet. I could quote other manufactures claims and DD rwhp to support the drivetrain loss is fairly consistent.

Also the DD don't put more load on the engine. With a DD you can specifiy a ramp rate and this can be changed by the operator through the software from one run to the next from one car to the next....the ramp rate is the rate at which the DD will allow the tyres to turn the rollers and therefore the engine to rev.



Back on topic.......the VVL head conversion and ability to rev to 8500/9000 and beyond is great an all.....however how long is the bottom end going to last....piston speeds are going to go through the roof, crank starts walking around and.......are bearings and oil pumps etc going to become "consumables".

Don't get me wrong, the converson sounds great.......but are we chasing our tails......and creating a 4 cylinder rotary?

shagspeed

Well an SR20 should sit safely at around 8700 RPM for a long time...Calculates to just under 25MPS .. So the occasional 9000-9500 should be okay .. Its prolonged exposure to exceeding 25MPS creates massive friction and yes can do catastrophic damage.. Running the then SR16VE-N1 Pump that dam little 1.6 can sit at 9K all day long actually more like 10.5K 25MPS on a 1.6 is right at 10.9K so I am not worried about the pump... As far as crank walk... Not so sure about that you might have a point there .. Though the SR16 that turn 9K from the factory are the same bottom end minus the crank girdle & reinforcements and they do just fine.. Though I would run the full 8 counterweight crank with girdle like I am doing and take out as much weight from the Piston and rod side of the rotating mass to try to get it as balanced as possible ... I think there is no worries on the VVL stuff. SR's are dam near bulletproof. as far as bearings go the 17mm wide bearings seem to do fine in the SR16's @ high RPM. You can also run a custom rod with.. I have a set of rods with double tangs 1 to run 17mm wide and another to run 19mm aka the 54C/GTI-R bearings

I have been messing with this dam SR engine for almost 13 years now... I have had a GTI-R engine I got about 130K on one build sitting at 380-400WHP on Pump Gas I drove every day anywhere .. This engines are Stout..

Mazworx_Sales

Dont blame alot of people being sketchy on what the VVL is capable of. Not many people know of the motor or even its existance. So its pretty much expected why people dont believe half the stuff that's posted up there about it.

The N1 motor from the factory had 8 injectors over 200+whp a/m. The thing revs out to like no tomorrow. I mean we have the exact same setup(VE/DET) in our S15 drag car and that thing revs to 11K making over 1400whp.

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doug200t

Mazworx, Shagspeed and I have actively followed your S15 Drag car, it proved our research on the VVL head. Just you guys had the funding for such a great project and beat us to it. Shagspeeds project 180sx is going to be released soon as it also will be a wicked head turner and confuse the current sr20 crowd we where making power on SR20s before any of these kids knew what they where. 500hp ins the 90s+ was unheard of and the cover of sport compact car we got to show the power off. Vipers had no idea why a sentra was pulling them on the freeway 10 car lengths.

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shagspeed

N1 head is also milled .40 as well from the standard 1.6L... Though the best head when it comes to VVL is the 20V head water passages are improved in such a way it allows for more porting to be done..

Also outside a race car that S15 is a piece of art work.. Very well done car... Yes I wish my pockets where as deep looks like that car has well over 100K in it.. Big Props on that car guys...

shagspeed

Yes toughs where the days.. Also Hyabussas wounder why this dam Sentra is side by side the whole way.. Though Road Racing is where its at for me now.. I will be happy with 450-475WHP on Pump Gas!!! I didn't sleeve my block so I think I am limited to 550 is about all I want to push it.. This will be pleanty to set some lap records if possible..

BTW what is the most anyone has got on a stock block???

juggernaut1

Shagspeed......as you pointed out they will live at those rpm however it sounds like you are customising parts/reciprocating mass to do so. Hope it all goes well for you....and keep us updated.

Mazworx as you've pointed out earlier quite a few Aussies are keen on the conversion and yes the conversion seems to be gathering momentum in Australia with a few builds in the process. The conversion has been done in prior years however, the results weren't overly convincing for one reason or another. Hopefully, it will be good to see a few more conversions in Australia finished to establish what is the "norm" rather than one off dyno's etc on our DD dyno's as seeing dynojet dyno numbers leaves things up in the air a little as we are not used to seeing such power numbers.......i.e. what factor do we apply to the the dynojet numbrs to get a DD number.

More importantly it will be good to see what the conversion is capable of in competition as I for one don't solely rely on WOT dyno numbers when assessing a package as I'm more into road racing.

P.S. I would love to see this conversion with a twin scroll T4 GT35 - could this be the ultimate street/circuit/drag package.....of course assuming you could get the power to the ground?

shagspeed

All I did was use the 8 counterweight crank as this is what is available to everyone easy as it was for me... So nothing crazy just simple ..

Also on getting power to the ground.. All you can get to the ground is TQ so this is why I think the VVL will work so well makes TQ and should go flat across while HP climbs to the moon.. Also though not too knowledgeable on TQ vs Traction I would think as speed goes up so does your available traction vector as down force will increase .. Speed based boost! I do believe the Haltech Platinum I am getting has that..

Teambadrun

How come all the charts im reading are all dyno queen charts? not one car there makes anywhere near 350rwhp at 4000-4200rpm?????? they all make power after 5,000rpm(abit late! for a GT3071/ or 76R)

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whitey240

Here is a video from Import vs Domestic: *Note, this was my first time racing the car for about a year and a half. With more seat time and a few changes I know it will be a 10 second car.

The car has been a blast to drive and I can't say enough about the service and quality from Mazworx. I am glad I could help them in creating the kit. Daily driving the car is a dream now. The power is delivered so linear and smooth that is makes a ~500hp car predictable. If you have any questions on my experiences with Mazworx, the kit, or how it drives feel free to reach out to me.

The car is currently for sale on Ebay as I have another project burning in my mind. But if it does not sell next year it will see a few more goodies. Two things are currently holding it back from making peak power. I think we reached the max on the fuel setup and the Z32 MAF. That needs addressed as well as better gearing for drag racing.

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S13 curtis

hold your breath.

whomiked

Can't see the before and after dyno numbers. Can someone post em?

KaranS14

Hi I'm from the Uk and not really anyone using these heads here...

I have a s14 I use mainly on track specifically trips to the nurburgring, currently running unopened engine with a 2871r 0.64 at about 20psi 340bhp on rolling rd. It's been super reliable for a long time however recently with all the chassis improvements I've been craving more power. I bought a sr16ve head a while back and have been thinking of fitting this along with a slightly larger turbo, maybe gt3071r-wg, keeping the low mount setup I have.

Couple of questions... Will stock pistons be ok with the high lift sr16 cams or will I need cutouts? Will the turbo run out of puff...I may want t rev to 8000 and would be happy with 400hp.

Plan on using the mazworx kit, and sticking to my power fc with 740s

Many thanks
Karan