SoCal07HR

iTrader: (17)

Okay I know I'm going to get flamed for this post but I would really like to have a discussion about an N/A built HR and what kind of performance could be expected.

I searched and came up with thes threads:

This one is a little discussion on cams but yields no solid info.
https://my350z.com/forum/vq35hr/405667-na-builds.html

This one is just a flame fest then becomes a discussion on gears toward the end.
https://my350z.com/forum/vq35hr/4798...l-the-way.html

I've seen some of the guys with headers and cams who are making good power but I would like to know what a more complete N/A build would make.

What's your best guess on power and torque numbers for:

3.8L stroker

12:1 compression

Aggressive cams (tomei 272's or 280's, or possibly GTM depending on further research)

Mild port job

Headers

Running on E85

I was thinking possibly 360 whp and maybe 340 wtq but it could be even higher, I don't know. What do you guys think?

I know turbos or a supercharger would yield more power at the same cost but I'm really still considering building my car NA because I just love that NA scream and believe there will be less cooling issues at the track with an NA build.

I would really like to have an intelligent discussion on this so I beg you guys to keep the flaming to a minimum.

What power and torque numbers could be expected?
What cam options should be considered for a build such as this?
Where would the powerband be?
The 3.8 will make more TQ at low RPM, but based on using very aggressive cams how high of an RPM could peak power be expected?
I was thinking E85 and somewhere around 12:1 compression any reason to consider a higher or lower ratio?

If I decide to pursue this route I will begin amassing part for this over the next 4-5 months. Thanks guys, flame suit on.

johnwigs

AM performance make 380whp with a 3.7 crank and nismo N10 cams that are available soon, it is possible to get around 13.1 compression before you are sacrificing valve releifs causing loss of compression. E85 would require Motec
PM for info on the engine builder of these monsters (here in San Diego)

0jiggy0

iTrader: (13)

380whp on what dyno? Post a link or something, those are lofty claims.

SoCal07HR

iTrader: (17)

Any links??

SoCal07HR

iTrader: (17)

Okay googled AM performance and came up with a dyno vid!

http://www.youtube.com/watch?v=px2PF...e_gdata_player

No power numbers at all though.

This is a pretty random vid from AM performance talking about how they set up the dyno for a late night pull, no numbers in this one either but he does mention 9000 rpm.
http://www.youtube.com/watch?v=uaiV9...e_gdata_player

So they are using a dynapack dyno which could explain the 380 horse power number. My bolt-on HR made the numbers in my sig on a dynapack.

0jiggy0

iTrader: (13)

Thats a vhr, completely different motor. That website also shows a fullout racecar.

SoCal07HR

iTrader: (17)

Yep definitely a VHR, but still good info for reference on what a built NA HR might make power wise.

Rubidium

iTrader: (6)

Get some FI LTH's! I too may forgo this project once I get back to sea.

SoCal07HR

iTrader: (17)

The headers designed for the 370z right? I was reading about that and I thought it was still untested as far as fittment on our cars. New news on the subject?

johnwigs

not a VHR... I know that a 370z has VHR but in simple terms it is a 3.7 shortblock with HR heads and cam control with some insane cams +13.0:1 compression, race gas, 380RS intake, LTHs ... there is alot of full race car voodoo involved... which means if you want to know you need to pay the piper and join the club about $23,000 into these motors

johnwigs

http://www.youtube.com/watch?v=fTB7f...eature=related
at about 3:50 you can see exhaust retarder timing cover (VHR doesn't have exhaust retarders)

SoCal07HR

iTrader: (17)

Good info, thank you.

Naut

iTrader: (13)

You can also reference the 380rs which is a mildly built 3.8 HR @12.4 CR good for advertised 350hp/293tq . Then you have the Amuse 380rs which I believe was built on-top of the 380rs with these parts below adding up to 380hp/302tq. The first number is most likely not whp but i'm not entirely sure on the amuse #'s.

Model-based vehicle: CBA-Z33
Engine type: VQ35HR (modified 3.8 litre)
Exhaust volume: 3798cc
Maximum output: 386ps/7100rpm
Maximum torque: 41.8kgm/4860rpm
Compression ratio: 13.6:1

Engine
Amuse R1 camshafts, Amuse R1 titanium headers, Amuse R1 sports catalysts, Amuse R1 titanium front pipes, Amuse R1 Extra titanium exhaust system, Amuse Hi-Tec Rom ECU

johnwigs

a real 380RS uses a GTR crank (with and oil pump groove cut in and front snout cut shorter) I don't know why it shows oil squirters... HRs come with those already... all of the magic is in the cam's... Nismo N10's that will be avilable soon are so big that full advance is not achievable anymore (takeing some compression out will help), I think it is in the 300* range!!!!

Rubidium

iTrader: (6)

I've actually had a lot of conversations with Tony from Fast Intentions, I would only gain about 10hp and 15tq over my stock headers and ART pipes. Tony mentions that they fit just fine minus some under body adjustment, under the driver of passenger side you'd have to kock back a panel just a smidge but not enough to damage the body in any way. I want to do it but decided to buy some wheels instead and when I do my built block I'll buy them but untill then.

SoCal07HR

iTrader: (17)

When you say 380rs intake, do you mean this one?



I just want to clarify because the road going 380rs looks to have the standard HR intake. But if it was different it might be something to look into.

johnwigs

Sorry I didn't specify 380rsC... yes the black box that has nissan voodoo in it... to buy one you need to have a motorsports account # and a ludicrous bank account... and the road going 380RS has an aluminum catch can integrated with the coolant overflow tank

SoCal07HR

iTrader: (17)

Thanks for the info, but I think you might have been posting from a phone because it's not real clear on what needs to be knocked back. Under the driver of passenger side? So both sides? So I'm thinking one of the lips where two panels come together needs to be rolled flat. More info please. I'll dig up that thread on those headers.

Good info again. I'm not even close to wanting anything that extreme.

I want snappy throttle response, more power, and a higher redline, maybe 8500-9000 rpm depending on where peak power ends up. Some really big cams and the springs to control them, with rods and high compression pistons, running on 100-105 octane E85 should do it I'm thinking. I'm on the fence about stroking it.

SoCal07HR

iTrader: (17)

Rubidium, I can't find that thread on those headers but I remember reading it a while back, do you remember what it was called?

Rubidium

iTrader: (6)

The information Tony sent me was in a PM on the 3 7 0 z :
On the car I installed them on they fit perfect with the exception of one small area. On the driver side almost at the bottom the heat shield and floor needed to be clearanced a little bit so the headers would not touch them. Aside of that you should have no issues.

Once they are ordered they ship in about 8-10 weeks. I only require a $200 deposit when you place the order and will not charge you the remaining balance until they are built and ready to ship.

If you have any more questions or would like to place an order, please do not hesitate to call me directly...

Thank you, Tony

The thread labeled:
370z Long Tube Headers