Alright i've been doing a little bit of research trying to see the positives and negatives about destroking an engine. Nissan GT2 race teams did it to the DE motor to achieve high rpm's that are better for road course racing. From what I could tell if that 3.0l DE crank will fit in the HR motor and the rods and pistons for destroking that motor will work than it would pretty much cost the same as stroking the motor to 4.0l. I already know that destroking will lose tq, but you can gain much higher rpm's and more top end hp. My HR motor already has the Greddy 20g kit on it, and i'm getting to the point where I want to turn up the boost but not on stock internals obviously. I also want to stay away from the cookie cutter stroker kits and just switching over to low compression that everyone else is doing so that's another reason why i'd like figure out how to go about this seemingly uncharted territory with the HR motor.

Nissan Motorsports has this listed in their catalog "VQ30DET crankshaft. 73.3mm stroke; 50mm rod journal. This crankshaft is used primarily for GT2 competition."

Carrillo also makes connecting rods specifically for the destroked 3.0l DE motor.

 

Is your car a designated track car? If not I wouldn't bother. How often are u going to be doing 7k+ rpms daily driving. Not worth the cost/effort if its an everyday car

 

How high are you trying to rev? For reference adam@Z1 can rev to like 8800 with the 3.5L. Is there a reason you want to go to all that effort for more? And lose torque?

 

8800RPM is pretty high. Do you know if it was an HR motor, and what internals did he use?

 

I have personally taken it up to 8400 while driving it and no it is not an HR.

Any more info about it is in this thread
https://my350z.com/forum/na-builds/2...p-to-nuts.html

 

Im taking my Stock Block and head HR Right now to 8K with no problems.

 

Yeah I was thinking for road course racing it would be beneficial to be able to go all the way up to 10,000rpm, but after doing more research I found that the Nissan team for the GT2 series dumped the destroked turbo for the 4.5l V8 NA motor. I'll try and rack my brain to figure out something else a little more original with these 20g's without going broke.

 

vq30 crank won't fill the main journals of an HR

HR block + 09-11 VR38DETT (GTR) crank= 380RS motor...

long rods, custom pistons, GTR valve springs, haltec ECU, trick *** exhaust system= 400hp... been done before just the path less traveled... and only 1 that I know of stateside

you could be #2

 

Where can I read up on this? Thanks.

 

 

I'd also would like to know where I can read up on this. I came from the honda world where people are always switching oem internals, but no one here really has experience with it.

 

A VQ37 crank is cheaper that the GTR VR38 crank last i checked. It was around $600 new IIRC. You would just have to use VQ37 rods then with your stock pistons too ( should work based on the piston comp heights being the same i believe) That would be the cheaper stroker setup for a 3.5L...

As for destroking, if you wanted to rev higher more, and all the time, or needed less displacement, then you could run a VQ30 crank and an HR rod is very close to the correct length in a DE block and that would be about a 3140cc motor with the stock bore.

 

Well, with no actual experience with it, if i were to use a vq37 crank, i would use the rods, and pistons to get that extra bump in compression as well, the rods and pistons were not that expensive either. If I wanted another bump, again, no written data there was one guy that said hes seen it done, I would get the crank out of a pathfinder vq40, just not sure which rods and pistons to use. That crank is hollow and the vq40 had a redesigned bottom end similar to the hr bottom end. Which should have an exact fit on the bearing journals.

 

The VQ37 pistons have deeper intake valve reliefs but the exhaust reliefs are no where near as deep and may hit with larger than stock cams. I will check my FSM's to see if the pistons have the same comp height.

 

Any more info on this?