What is included in the Boost Logic 4.1L Stroker Kit for R35?

The 4.1L Stroker Kit for R35 includes a billet 4340 steel crankshaft with a 94 millimeter stroke, Manley custom stroker H beam connecting rods and custom Diamond pistons. Boost Logic does not list bearings, piston rings, gaskets or block machining as included, so confirm those with Bulletproof Automotive and your engine builder before the build starts.

How much displacement does the stroker kit add?

The 94 millimeter stroke crankshaft raises the VR38DETT from its factory 3.8 liters to 4.1 liters. Boost Logic says the added displacement gives better engine response. It does not publish a power figure for the kit alone, because the final output depends on the turbochargers, fuel system and tuning chosen for the rest of the build.

Which compression ratio are the pistons?

Boost Logic supplies custom Diamond pistons in custom compression ratios rather than one fixed figure. The right ratio depends on the boost level, fuel and tune planned for the engine, so Bulletproof Automotive will confirm the ratio with Boost Logic when the order is placed. Choosing it with your tuner first avoids delays.

What is the Pro Mod wrist pin upgrade?

It is an optional C350 wrist pin upgrade sold as a set of six. Boost Logic describes C350 as a unique material sourced from Austria that is used across Pro Mod level platforms making more than 3,000 horsepower. It adds margin at the pin for builds pushing toward the limits of the rods and pistons, and it costs extra.

Can I install the kit myself?

Only with engine building experience. The crankshaft, rods and pistons are fitted with the block apart and the clearances checked during assembly, so it is a job for an experienced engine builder. Owners who want to skip that step can choose the Boost Logic 4.1L stroker short block, which arrives assembled with Boost Logic coated bearings.

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Description

Boost Logic 4.1L Stroker Kit for R35 Nissan GT-R

Boost Logic’s 4.1L Stroker Kit for R35 Nissan GT-R supplies the rotating assembly parts to take the VR38DETT from 3.8 to 4.1 liters: a billet 4340 steel crankshaft with a 94mm stroke, Manley custom stroker H-beam connecting rods and custom Diamond pistons in custom compression ratios. Boost Logic places it at the top of its high horsepower engine builds and says owners can expect better engine response. It is a kit for an engine builder to install with the block apart, so it suits a shop-built engine; owners who want the bottom end delivered assembled should look at Boost Logic’s stroker short block.

Features

Billet 4340 steel crankshaft with a 94mm stroke
Raises VR38 displacement to 4.1 liters
Manley custom stroker H-beam connecting rods
Custom Diamond pistons in custom compression ratios
Better engine response, per Boost Logic

What’s Included

Billet 4340 steel crankshaft, 94mm stroke
Manley custom stroker H-beam connecting rods
Custom Diamond pistons

Applications

Nissan GT-R: R35 | 2009-2024 | 3.8L VR38DETT V6

Notes

Boost Logic lists the crankshaft, connecting rods and pistons as the kit contents; bearings, rings, gaskets and machining are not listed and should be confirmed before ordering
Pistons are made in custom compression ratios; confirm the ratio with Bulletproof Automotive to suit the planned boost, fuel and tune
An optional Pro Mod C350 wrist pin upgrade, sold as a set of 6 in a material sourced from Austria, is available through Bulletproof Automotive
The 4.1L Stroker Kit for R35 is installed with the engine apart by an engine builder
For a bottom end delivered assembled, Boost Logic builds the Boost Logic 4.1L Stroker Short Block for R35 Nissan GT-R (BL41SVR38GTRSB)

Frequently Asked Questions

What is included in the Boost Logic 4.1L Stroker Kit for R35? The 4.1L Stroker Kit for R35 includes a billet 4340 steel crankshaft with a 94 millimeter stroke, Manley custom stroker H beam connecting rods and custom Diamond pistons. Boost Logic does not list bearings, piston rings, gaskets or block machining as included, so confirm those with Bulletproof Automotive and your engine builder before the build starts.
How much displacement does the stroker kit add? The 94 millimeter stroke crankshaft raises the VR38DETT from its factory 3.8 liters to 4.1 liters. Boost Logic says the added displacement gives better engine response. It does not publish a power figure for the kit alone, because the final output depends on the turbochargers, fuel system and tuning chosen for the rest of the build.
Which compression ratio are the pistons? Boost Logic supplies custom Diamond pistons in custom compression ratios rather than one fixed figure. The right ratio depends on the boost level, fuel and tune planned for the engine, so Bulletproof Automotive will confirm the ratio with Boost Logic when the order is placed. Choosing it with your tuner first avoids delays.
What is the Pro Mod wrist pin upgrade? It is an optional C350 wrist pin upgrade sold as a set of six. Boost Logic describes C350 as a unique material sourced from Austria that is used across Pro Mod level platforms making more than 3,000 horsepower. It adds margin at the pin for builds pushing toward the limits of the rods and pistons, and it costs extra.
Can I install the kit myself? Only with engine building experience. The crankshaft, rods and pistons are fitted with the block apart and the clearances checked during assembly, so it is a job for an experienced engine builder. Owners who want to skip that step can choose the Boost Logic 4.1L stroker short block, which arrives assembled with Boost Logic coated bearings.

About Boost Logic

Boost Logic was founded in Austin, Texas in 2003 and made its name with Toyota Supra turbo kits, setting street car records at 6speed record days and the Texas Mile that stood long after the company stopped racing Supras competitively. It designs turbo systems, titanium exhausts, intercoolers and engine components for the Toyota Supra, Porsche 911 Turbo, Nissan GT-R, Ferrari and Lamborghini, and its R35 GT-R builds have trapped over 180 mph in the quarter mile and over 200 mph in the half mile.

Additional Information

The Bulletproof Automotive website contains many thousands of products purchased in multiple different currencies. All of the prices are entered manually and accurately at the time of entry. Due to the consistently fluctuating international exchange rates, at times prices may not be able to be honored at their original intended rate. We apologize for any inconvenience this may cause, unfortunately our website is unable to compensate dynamically for what can at times be volatile changes in the cost of items due to currency values fluctuating, changes in prices from suppliers, changes in shipping and import duties, and other factors. Rest assured that any order you place on line will be at zero risk to you in this area. If in the event your order cannot be fulfilled at the original intended website price we will offer you a 100% refund, no questions asked. We will continue to do our best to maintain updated prices and we will always continue to offer our price match guarantees as well to ensure our prices are always the best for you. In short, prices may change without notice. It is always advised to give us a call prior to placing your order online to confirm availability and to confirm current pricing.

Shipping Policy

Items that are in stock in the US, either at Bulletproof’s warehouse or at a supplier’s warehouse, are generally delivered within 7-10 days. Special order items from overseas take considerably longer. As a courtesy Bulletproof offers delivery estimates to our customers which take into consideration manufacturer availability and shipping schedule. These estimates represent our best guess based on previous orders from the manufacturer and do not in any way imply a guaranteed delivery window. Many manufacturers work in a “just in time” inventory system and often take 2-20+ weeks to produce an item once an order is submitted. All deliverable items are then sent to our Japanese warehouse. Bulletproof ships a minimum of one full ocean freight container every month from Japan, oftentimes more than one a month. Ocean freight takes an average of 4 weeks. Typically it breaks down to one week in Japan for paperwork and customs, two weeks by boat and one week in US customs/clearance. Due to the wide number of variables between manufacturer and shipping schedules, delivery estimates are simply just that – estimates. We attempt to estimate conservatively and we usually deliver faster than our estimates suggest. It is not Bulletproof’s policy to guarantee delivery time of any special order item, this is impossible for us to do. By ordering you acknowledge that there is no required delivery ETA and an order may not be canceled or altered due to manufacturing or shipping delays, all ETA’s are provided as a best guess only. Please review the full Terms & Conditions here.

BP Pricing Difference

We do pricing a little differently on our JDM brands and we believe in making things simple and clear. No hidden fees or surcharges. Every price you see includes the shipping cost to our office in Los Angeles, California and all the associated taxes/duties/fees for bringing the products into the US. The only shipping you ever pay is from our facility in the US to your location. Be wary of resellers that don’t include the cost of international shipping in their pricing on JDM parts. While we believe we’ll always have the lowest all-in price on JDM products, we offer a price match guarantee for all authentic parts purchased from authorized dealers as well. For many international customers, it’s much more affordable to ship from the USA than from Japan directly, as the air freight and ocean freight costs are typically much less. However, for customers looking to ship directly from Japan outside of North America, or domestically in Japan, we can provide pricing specifically for that scenario. Please do not hesitate to contact us with any pricing questions or concerns. Please email us at sales@bulletproofautomotive.com with any inquiries.

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Boost Logic 4.1L Stroker Kit for R35 Nissan GT-R [BL4.1SKNRG09]

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Boost Logic 4.1L Stroker Kit for R35 Nissan GT-R

Features

What’s Included

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Notes

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About Boost Logic

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