I have seen the Jun upgrade located on a performance parts website. Does anyone have information on how relaible upgrading the VQ to 3.8? Will this affect installing a FI? What could be the expected HP gain at 3.8 liters? Does anyone who is selling or has the kits in stock?

 

JUN kit will cost you 12000$ just for the kit
i think it can hold more than 1200hp+

you can get it from

19355 Business Center Drive #5
Northridge, CA 91324
Phone #: 818-998-6005
http://www.upgrademotoring.com/

Mr. Kyle Puckett
SGP Racing
11715 Veterans Memorial Suite A1
Houston, TX 77067
Phone #: 281-444-9195
http://www.sgpracing.com/

Mr. Nero Deliwala
Titan Motorsports
1714 N. Goldenrod Rd Blg A
Orlando, FL 32807
Phone #: 407-277-8423
http://www.titanmotorsports.com/

 

Other cheaper ways to bump up to 3.8L IMO.. Figure the VQ puts out about 82HP per litre so you're looking at roughly a 24HP gain from this.

 

Go with the 4.3 liter

 

Here's what AEBS feels about boring & stroking their block for use with F/I. I bought Gurgen's AEBS block with the intent to use my T-trimmed Vortech on it after boring it to 100 mm w/Darton MID sleeves & throwing that $4200 stroker crank in there. After speaking with Dave @ AEBS he advised against using the stroker crank because in order to allow for the addition throw of the crank it is necessary to remove some material from the block & he was afraid that this could compromise the integrity of the block under high boost pressures. He never said what the boost threshold was but when I said I was shooting for 16#+ he seemed concerned. I went ahead & had them do the bore but I'll be running the factory crank ( yielding a displacement of 3.87 liters ).
I wanted the 4.3 liter displacement but not at the risk of destroying the motor OR backing off on the boost!! Not sure what JUN's take is on this but perhaps someone else will chime in?

Gene

 

Mean Gene,
Would've been nice to see what a bored and stroked SC'd Z would put out. Anyway, as far as removing material from the block usually it's just a little shaving above the pan rail and bottom of the cylinder bore so the rod big ends don't hit. Using a crank with that much throw may require more than just a shave though. I don't, however, think that you'd really be affecting the blocks intergity that much to where you couldn't run 16#+. The block is girdled to some degree..`

 

Dawg - I've never been into a VQ so I don't have firsthand experience on just how much material would need to be removed so I'm flying blind here!
The cost of the crank was another BIG factor in my decision. I agree that ( especially with the Darton sleeves ) the block is probably pretty rigid so now my concerns turn to the head-lifting issues that Sharif & others have encountered at the 16# boost range. Gonna try his suggestion of torquing the ARP studs just a little tighter ( 5 lb-ft or so ) & hang on!! John Isbell is doing my install & says that we should be able to hit the 20# boost mark & with all the internal work ( JWT S1 cams ) along with the Ferrea valvetrain in the reworked heads we should be able to hit 600 rwhp on the Vortech & I still will have the nitrous in reserve.
We'll see how the fuel system holds up with the upgraded RC injectors & full return system ( plus an AquaMist ) before we push the envelope further with the squeeze.
Now I need SGP to hurry up with those upgraded clutch packs for the Nissan 5 A/T!! Guess we'll see where we end up as I'm about to drive the car over to John tomorrow.

 

I carry JUN products if you are interested in the kit, they do have a lot of the info about the kit on the site http://www.junauto.co.jp/products/cy...t/vq35.html?en If you have any questions feel free to PM me or give me a call 1-877-CPRACE-1

 

I guess you right the price per liter is low. This would probablt be a go upgrade for those who are not planning on staying NA. It seems like a lot fo work goes into installing the kit. Installation is probably more than the price of the kit

 

The stock bore piston is 93mm, simply adding sleeves and going to a 100mm piston can yield 4.2 liters. You can also use a VQ30 crank and with 100mm pistons it will yeild 3.7 liters of displacement. A VQ40 crank in a VQ35 and 100mm pistons would yeild 4.7 liters. You could easily rev to the stock rev limit safely.

 

just use the VQ40DE block with VQ35 heads

 

The actual VQ40 block is taller, so I don't how it will effect anything else. I am not sure if heads are different or anything. You could look up part numbers at Nissan and see if they are the same.

 

Havnt tried it but we discussed it nemerous times and pretty sure it will work,fit, etc etc

 

Quit posting bad info

DISPLACEMENT: 3.5L / 215cu. in.
BORE: 95.5mm
STROKE: 81.4mm
COMP. RATIO: 10.3:1
COMBUSTION CHAMBER: 51.5cc

Sleeves and 100mm pistons make it a 3.8L. Ask any of the people currently doing it. Our .020" overbore is ~96mm.

 

Can you actually fit the crank from the VQ40 into the VQ35 engine? I have to buy a new block and crank so this could be an option.

 

King is correct. Overboring to 100mm will yield 3.8L displacement....this is what I have done on my new block with Darton sleeves.

Guys, I have hinted before on this, and recently started adding some of the GTM spec product to our website. But honestly, forget about the JUN and AEBS stroker kits. GTM has 3.8L and 4.2L stroker kits that are far superior in quality, and design, at a fraction of the cost.

As a teaser (should be ready to ship in 30-45days), the GTM 3.8L or 4.2L stroker kits are $6000 COMPLETE! We are GTM Master Distributors, and will have some additional detail on these kits loaded onto the website shortly.

 

Good to know for those who dont know there are other options.

 

Good to hear. I was wondering how long it would take for you to become the end-all be-all of the VQ world and complete motors was about all you were missing. Guess you don't have to worry about the headache of ordering bearings and all that. I hear Clevite now has sizes for the VQ even though they didn't have it in their catalog at PRI.

 

Hehe..thanks!

If you check out our website, under ENGINE COMPONENTS...we now have a section for engine packages. Take a look. http://www.forgedinternals.com/store/home.php?cat=264

 

I am already machining the VQ40crnk to fit to the Vq35block.I am not ready by this time.Also i will run 100mm pistons with Dartons.

I must say that it is a nightmare.

VQ40 has bigger pin journal diameter and main journal diameter also.