HR Valvesprings, Retainers, and Seats Compatibility

*Deckdout2* · 08-07-2009, 11:14 AM

I have all of these components and they were going to be matted up to the JWT Knockoff Cams that I have as well. I was considering going with a more aggressive grind, something like Tomei 264's or 268's, or Brian Crower 264 cams. My question, will these components be ok to use with these more aggressive cam profiles or should I get the set that's for example "proprietary" to the Brian Crower cams?

As well, my other question is what is an ideal cam spec that will work well with what I'm looking for? There are numerous options out there as we all know and there are so many distinguishable characteristics of each, making a decision has been somewhat discerning for me.

What I'm looking for is something that is as aggressive as I can go while retaining streetability, pump gas, and the highest peak horsepower along with a substantial increase throughout the powerband. I plan on raising the rev limiter upwards of 8000k rpms, and would like something that will still provide gains in that portion of the powerband. The motor will be matted to 4.087 final drive if that encourages any decisions.

I have played with the idea of going with "Something 272's" or higher, but I don't see where that will suit my needs of not only achieving higher numbers, but an equal increase in the entire powerband.

I've done tremendous searching to see what people use here and what the 350z guys tend to mainstream, but everyone is just all over the place on this particular subject. Initially, this was going to be a budget build with the JWT knockoffs, but I'm willing to not skimp on a set of good cams that will be my fence on whether I reach my goals or not.

I know I'm asking for the sky here, but any assistance would be appreciated as always. I've already starting tearing down the motor, and have failed to have time to start a build thread. I'll surely start one soon........maybe in the next few.

throttlehappy46 · 08-07-2009, 06:21 PM

If your looking at a 7500rpm rev limit, then I would be chasing something that is strong from 5500rpm up, so that on each 7200rpm+ gearchange, your next gear is falling to around 5500rpm which gives a nice strong and consistent torque 'wave'

For this, the smaller of the Tomei cams would be ideal and give a strong cruising torque for better fuel economy and stop/start driving.

**nismology** · 08-07-2009, 10:06 PM

Any headwork planned? Which IM setup? With 264'ish cams and no headwork I can guarantee you won't be seeing any worthwhile power past 7500.

For reference adam from Z1 had EXTENSIVE headwork done (porting plus bowl and valve seat work) and porting/reshaping of a standard 350Z non-revup plenum with 268 tomei cams and saw peak HP @ 6800 with a slow flat decline to the 8000 RPM redline.

As for valvesprings, HR springs are good if you're on a budget. If you plan on revving to 8k+ with serious cams you should look into double springs. I believe the crower springs are interference fit doubles. Supertech and ferrea make non-interference doubles. Every other aftermarket springs that i know of (nismo,JWT,tomei, etc.) are single springs and not worth your time.

kzoosho · 08-07-2009, 10:15 PM

Quote:

Originally Posted by nismology

Any headwork planned? Which IM setup? With 264'ish cams and no headwork I can guarantee you won't be seeing any worthwhile power past 7500.

For reference adam from Z1 had EXTENSIVE headwork done (porting plus bowl and valve seat work) and porting/reshaping of a standard 350Z non-revup plenum with 268 tomei cams and saw peak HP @ 6800 with a slow flat decline to the 8000 RPM redline.

As for valvesprings, HR springs are good if you're on a budget. If you plan on revving to 8k+ with serious cams you should look into double springs. I believe the crower springs are interference fit doubles. Supertech and ferrea make non-interference doubles. Every other aftermarket springs that i know of (nismo,JWT,tomei, etc.) are single springs and not worth your time.

I wondered how hard it is to install doubles? I just installed my rev up springs and i tell you it was not fun. How much harder are the doubles?

throttlehappy46 · 08-07-2009, 10:26 PM

Doubles are quite possibly easier, they fall into place and are retained better.

I believe Crower only have single springs and it was Cosworth who have the doubles? The Supertech duals appear to have some good specs though if you dont have the budget for the Cosworth dual kit(around half the price for the Supertechs!)

**nismology** · 08-07-2009, 10:44 PM

Quote:

Originally Posted by throttlehappy46

I believe Crower only have single springs and it was Cosworth who have the doubles?

BC (brian crower) definitely offers interference-fit (can't seperate them) double valve springs. Whether or not they offer them for the VQ35 application is what remains to be seen.

Here's one:

kzoosho · 08-07-2009, 11:16 PM

Dammit , i wish i knew this before i went ahead with my rev up springs.

*Deckdout2* · 08-08-2009, 01:38 AM

Quote:

Originally Posted by throttlehappy46

If your looking at a 7500rpm rev limit, then I would be chasing something that is strong from 5500rpm up, so that on each 7200rpm+ gearchange, your next gear is falling to around 5500rpm which gives a nice strong and consistent torque 'wave'

For this, the smaller of the Tomei cams would be ideal and give a strong cruising torque for better fuel economy and stop/start driving.

Thanks for the options. I'll have to look further into other's testimonies on this set.

Quote:

Originally Posted by nismology

Any headwork planned? Which IM setup? With 264'ish cams and no headwork I can guarantee you won't be seeing any worthwhile power past 7500.

For reference adam from Z1 had EXTENSIVE headwork done (porting plus bowl and valve seat work) and porting/reshaping of a standard 350Z non-revup plenum with 268 tomei cams and saw peak HP @ 6800 with a slow flat decline to the 8000 RPM redline.

As for valvesprings, HR springs are good if you're on a budget. If you plan on revving to 8k+ with serious cams you should look into double springs. I believe the crower springs are interference fit doubles. Supertech and ferrea make non-interference doubles. Every other aftermarket springs that i know of (nismo,JWT,tomei, etc.) are single springs and not worth your time.

From what I've heard, the VQ35DE heads flow pretty good as they come. However, I am planning on having a 3 angle valve job performed along with anything else needed and will fit the budget. I was going to go with 11.1:1 Weisco pistons and take your suggestion of milling down the deck to gain a little bit higher compression. Then I saw the JE 11.7:1, and considered just dropping those in and calling it a day. I want to be right under 12.1:1 CR for my goal.

I read Adam's build, all 3542 pages in that thread. ha. He's got a tremendous amount of work done to those heads and plenum. I'm going to figure out my plenum situation on the dyno when the build is complete. I'm going to tune with my SSIM and as well with the 350z spacers and plenum off Matt's car and see which will yield better numbers as well as perform better. Considering throwing on the MREV as well. So that's in the air till I get something solid.

I was looking into the BC Valvetrain, and I'll do some searching for the double interfaced springs. That sounds like a good idea. I wonder even if it is offered for the VQ35, how much more that would be over the single set. I just want to make sure I'm on the safe side of things.

Quote:

Originally Posted by nismology

BC (brian crower) definitely offers interference-fit (can't seperate them) double valve springs. Whether or not they offer them for the VQ35 application is what remains to be seen.

Here's one:

I've seen those before. Looks like they'd get the job done.

throttlehappy46 · 08-08-2009, 02:44 AM

JE pistons? I thought it was JUN that had that compression ratio, as JE still list theirs at 10.5:1?

*Deckdout2* · 08-08-2009, 07:20 AM

Quote:

Originally Posted by throttlehappy46

JE pistons? I thought it was JUN that had that compression ratio, as JE still list theirs at 10.5:1?

Jeremy when he used to own Performance Factory down in Florida was able to obtain the 11.7:1 CR from JE for one of the 350z guys. I believe it might have been a custom order at that particular time, but I saw somewhere else that these were available for the VQ35.

*Deckdout2* · 08-08-2009, 10:02 PM

It looks as if Brian Crower does offer dual valvesprings for the VQ35DE.

http://www.horsepowerfreaks.com/part...Springs//10429

**nismology** · 08-09-2009, 12:00 PM

Yes the picture they have associated with the VQ35 part # appears to be a dual spring.

http://www.briancrower.com/view.php?pn=BC0220

*Deckdout2* · 08-09-2009, 03:17 PM

Just picked up a set of Brian Crower 264/264 Stage 2 Cams. Got a great deal on them, and I know it's not as aggressive as the 272/272's but I didn't want to mess with having to find a way to adjust the VTC's and the time involved with tuning them. As well, this is as aggressive as I wanted to go. Now I'm off to search for the BC Dual Valvesprings Valvetrain at a great price.....

http://g35driver.com/forums/engine-f...cams-sale.html

MOHFpro90 · 08-09-2009, 03:54 PM

Not sure exactly what you're looking for, but you might want to check http://www.importperformanceparts.net/

They have dual springs from Supertech and Ferrea and singles from Eibach and Manley. Just a heads up.

*Deckdout2* · 08-09-2009, 04:35 PM

Quote:

Originally Posted by MOHFpro90

Not sure exactly what you're looking for, but you might want to check http://www.importperformanceparts.net/

They have dual springs from Supertech and Ferrea and singles from Eibach and Manley. Just a heads up.

Thanks Brotha- I'll take a look there as well.

Here's my For Sale Thread for my JWT S1 Knockoffs, and New HR Valvetrain if anyone is interested in picking these up from me.

FS: Goodies for you Power-Hungry VQ30 & VQ35 Drivers

MOHFpro90 · 08-09-2009, 07:24 PM

No prob. Also, if I remember correctly, the ARP bolts for the 3.5 do not fit the 3.0

But, dont quote me on that.

**nismology** · 08-09-2009, 07:31 PM

Quote:

Originally Posted by MOHFpro90

Also, if I remember correctly, the ARP bolts for the 3.5 do not fit the 3.0

But, dont quote me on that.

They won't because the 3.0 rods use a stud/nut.

You wouldn't need them in any case since the stock 3.0 setup has proven itself to be reliable to VERY high RPM.

TurboS13Hatch · 08-12-2009, 06:59 AM

Quote:

Originally Posted by nismology

Any headwork planned? Which IM setup? With 264'ish cams and no headwork I can guarantee you won't be seeing any worthwhile power past 7500.

For reference adam from Z1 had EXTENSIVE headwork done (porting plus bowl and valve seat work) and porting/reshaping of a standard 350Z non-revup plenum with 268 tomei cams and saw peak HP @ 6800 with a slow flat decline to the 8000 RPM redline.

As for valvesprings, HR springs are good if you're on a budget. If you plan on revving to 8k+ with serious cams you should look into double springs. I believe the crower springs are interference fit doubles. Supertech and ferrea make non-interference doubles. Every other aftermarket springs that i know of (nismo,JWT,tomei, etc.) are single springs and not worth your time.

I've taken JWT's single spring (with thicker shim), to 8K rpm, using their C8 camshafts, without any valve float. This was on a ported head VQ swapped Spec V. This was backed up by Clark Steppler.. No problems after a year+ of abuse.

Travis

**nismology** · 08-12-2009, 07:25 AM

Well that may be fine for the C8 profile but maybe not for cams with more aggresive ramp profiles; especially since he stated he planned on revving in excess of 8k RPM. Just wanted to throw some other options out there.

*Deckdout2* · 08-12-2009, 07:41 AM

Suitable should be more accurate, I'm willing to go as high as the power will take me.

**nismology** · 08-12-2009, 10:14 AM

Well it's true that the powerband should dictate the rev limit but you should also have a measure accidental overrev protection. You don't want to be at the limit of a spring at the intended rev limit. With that said, the crowers are probably overkill for those 264's.

CPBOYZ · 08-23-2009, 01:30 AM

U still got them things for sale