VG30ET piston compatibility and rebuild questions - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Nevyn04 · 01-17-2015, 03:20 PM

I'm getting parts together to rebuild my '87 300zx turbo. I've decided to up my compression and was originally just going to swap in NA pistons. But I will be upgrading the turbo, and increasing boost, looking for between 400-500 rwhp. So I'm going to put forged pistons in. This way I don't have to worry about them and have room to grow later if I decide I want to. I can't seem to find forged for the VG30ET. I've found an abundance of VG30DETT. What I've gathered is these will fit but due to cylinder head differences compression will be lower. Is this correct? Can I swap the z32 heads over to correct this? If not, how much is the difference? I'm lookin for around 9.5:1 cr.

Any help is appreciated. Thanks.

Nevyn04 · 01-21-2015, 02:31 PM

Nobody knows?

[email protected] · 01-22-2015, 10:25 AM

The Z32 Pistons work, but due to the difference in cylinder head design your compression ratio will be lower. if you are looking to achieve 9.5:1 CR you would basically have to get custom pistons made.

the only pistons available for Z32 off the shelf is

8.5:1
9:1
10:1 (N/A)
11:1 (n/A)

I would suggest the 9:1 TT pistons to leave you with a nice CR for high boost, otherwise I would highly recommend talking to the guys at CP or Wiseco for a custom set.

-Juan

Nevyn04 · 01-22-2015, 05:26 PM

Thanks for your response. I found on one forum that I'll lose about a full point in cr using z32. IE: 9:1 z32= 8:1z31. I'm at 7.8:1 now. Looking to increase for quick off boost response and quick spool, not necessarily high peak hp.

adamvann3 · 01-27-2015, 10:22 AM

EPR Performance has been dealing with building VGs for some time. I know a few SOHC that have ordered pistons through him with good luck.

http://epracing.net/

Nevyn04 · 01-30-2015, 06:49 PM

Awesome. Thanks for the link. I emailed him and got a quick response with exactly what I wanted. Now just gotta get z32 rods.

01-17-2015, 03:20 PM	#1
Nevyn04 Join Date: Aug 2013 Location: Florida Age: 34 Posts: 16 Trader Rating: (0) Feedback Score: 0 reviews	VG30ET piston compatibility and rebuild questions I'm getting parts together to rebuild my '87 300zx turbo. I've decided to up my compression and was originally just going to swap in NA pistons. But I will be upgrading the turbo, and increasing boost, looking for between 400-500 rwhp. So I'm going to put forged pistons in. This way I don't have to worry about them and have room to grow later if I decide I want to. I can't seem to find forged for the VG30ET. I've found an abundance of VG30DETT. What I've gathered is these will fit but due to cylinder head differences compression will be lower. Is this correct? Can I swap the z32 heads over to correct this? If not, how much is the difference? I'm lookin for around 9.5:1 cr. Any help is appreciated. Thanks.

01-22-2015, 10:25 AM	#3
[email protected] Zilvia Junkie Join Date: Dec 2009 Location: Fontana, CA Posts: 479 Trader Rating: (4) Feedback Score: 4 reviews	The Z32 Pistons work, but due to the difference in cylinder head design your compression ratio will be lower. if you are looking to achieve 9.5:1 CR you would basically have to get custom pistons made. the only pistons available for Z32 off the shelf is 8.5:1 9:1 10:1 (N/A) 11:1 (n/A) I would suggest the 9:1 TT pistons to leave you with a nice CR for high boost, otherwise I would highly recommend talking to the guys at CP or Wiseco for a custom set. -Juan __________________ Juan Vargas - Motorsports Specialist Fontana Nissan/Nissanraceshop.com email: [email protected] Scott's Personal Website/Blog: http://www.scottandkerryann.com

01-27-2015, 10:22 AM	#5
adamvann3 Leaky Injector Join Date: Dec 2010 Location: SE Wi Posts: 92 Trader Rating: (0) Feedback Score: 0 reviews	EPR Performance has been dealing with building VGs for some time. I know a few SOHC that have ordered pistons through him with good luck. http://epracing.net/ __________________ 88ss 368

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01-21-2015, 02:31 PM	#2
Nevyn04 Join Date: Aug 2013 Location: Florida Age: 34 Posts: 16 Trader Rating: (0) Feedback Score: 0 reviews	Nobody knows?

01-22-2015, 05:26 PM	#4
Nevyn04 Join Date: Aug 2013 Location: Florida Age: 34 Posts: 16 Trader Rating: (0) Feedback Score: 0 reviews	Thanks for your response. I found on one forum that I'll lose about a full point in cr using z32. IE: 9:1 z32= 8:1z31. I'm at 7.8:1 now. Looking to increase for quick off boost response and quick spool, not necessarily high peak hp.

01-30-2015, 06:49 PM	#6
Nevyn04 Join Date: Aug 2013 Location: Florida Age: 34 Posts: 16 Trader Rating: (0) Feedback Score: 0 reviews	Awesome. Thanks for the link. I emailed him and got a quick response with exactly what I wanted. Now just gotta get z32 rods.