GTM Performance Engineering VQ45VHR-Our Journey to The 1000 HP and Beyond

WarmAndSCSI · 10-27-2010, 07:07 PM

I wish people would leave this kind of discussion to actual engine builders.

1.) The rods in the VHR are forged. I can't think of a single import V6 engine that has come with cast connecting rods since 1993.
2.) Stock Japanese crankshafts are all forged now, with little need for upgrading unless you want to stroke the engine or are pushing some serious specific output.
3.) Many newer high-performance import engines come with forged pistons, but not of the strongest 2618 alloy and instead 4032 or similar alloys. This is due to the low silicon content of 2618 causing greater piston expansion during operation. A factory engine cannot be built to proper specs with emissions and reliability in mind with 2618 alloy pistons - the piston-to-cylinder wall clearance must be very high in comparison to stock hypereutectic or 4032 alloy pistons (0.003-0.005" vs. 0.0008-0.0012" or so).

That said, the forged rods that come with the VHR may or may not be strong enough to handle a certain amount of torque output. As with the rod cap fasteners as far as being able to handle abuse at a certain power level or RPM. In addition, the stock pistons - even if 4032 forged (looks are deceiving, they may still look like cast pistons) - aren't very strong given the 11:1 CR.

racerxj17 · 10-27-2010, 07:37 PM

Quote:

Originally Posted by WarmAndSCSI

I wish people would leave this kind of discussion to actual engine builders.

1.) The rods in the VHR are forged. I can't think of a single import V6 engine that has come with cast connecting rods since 1993.
2.) Stock Japanese crankshafts are all forged now, with little need for upgrading unless you want to stroke the engine or are pushing some serious specific output.
3.) Many newer high-performance import engines come with forged pistons, but not of the strongest 2618 alloy and instead 4032 or similar alloys. This is due to the low silicon content of 2618 causing greater piston expansion during operation. A factory engine cannot be built to proper specs with emissions and reliability in mind with 2618 alloy pistons - the piston-to-cylinder wall clearance must be very high in comparison to stock hypereutectic or 4032 alloy pistons (0.003-0.005" vs. 0.0008-0.0012" or so).

That said, the forged rods that come with the VHR may or may not be strong enough to handle a certain amount of torque output. As with the rod cap fasteners as far as being able to handle abuse at a certain power level or RPM. In addition, the stock pistons - even if 4032 forged (looks are deceiving, they may still look like cast pistons) - aren't very strong given the 11:1 CR.

1GR engine uses powered metal rods, as do several other engines these days. far cry from a solid forged rod....

WarmAndSCSI · 10-27-2010, 08:46 PM

Quote:

Originally Posted by racerxj17

1GR engine uses powered metal rods, as do several other engines these days. far cry from a solid forged rod....

Many powder-based sintered rods are stronger than their conventional forged counterparts, especially if the big end is fracture split. Far cry from a weak connecting rod

BTW, powder-based rods are classified as "forged" for all intents and purposes, due to the process involved.

1slow370 · 10-28-2010, 04:30 AM

6 vhr rods > 8 stock chevy 350 '83 camaro rods. they aren't bad people here are running 500hp across 6 rods without problems.

dnasty370z · 10-28-2010, 09:16 AM

Is this Manifold ever gonna happen???

destinyZ · 10-28-2010, 09:18 AM

Quote:

Originally Posted by dnasty370z

Is this Manifold ever gonna happen???

Give it time, it will happen.

racerxj17 · 10-28-2010, 07:32 PM

Quote:

Originally Posted by WarmAndSCSI

Many powder-based sintered rods are stronger than their conventional forged counterparts, especially if the big end is fracture split. Far cry from a weak connecting rod

BTW, powder-based rods are classified as "forged" for all intents and purposes, due to the process involved.

while that might be true, they shatter like glass under detonation. trust me...

bullitt5897 · 10-29-2010, 08:05 AM

Quote:

Originally Posted by dnasty370z

Is this Manifold ever gonna happen???

GTM is making their own version of the GTR Intake... There is a LOT of work involved in making this fit perfectly. Be patient... if you think you have it hard you have NO IDEA! this is my baby and I saw it a couple weeks ago for the magazine shoot and now I get to hang around the car for a whole week and cant even start her up!!!!

DIGItonium · 10-29-2010, 09:30 AM

Quote:

Originally Posted by bullitt5897

GTM is making their own version of the GTR Intake... There is a LOT of work involved in making this fit perfectly. Be patient... if you think you have it hard you have NO IDEA! this is my baby and I saw it a couple weeks ago for the magazine shoot and now I get to hang around the car for a whole week and cant even start her up!!!!

Just to clarify, are you referring to the lower intake manifold? I just want to make sure nothing has changed from the prototype photos released recently, and that we will still be able to use the existing VR38 upper intake collector.

bullitt5897 · 10-29-2010, 09:57 AM

Quote:

Originally Posted by DIGItonium

Just to clarify, are you referring to the lower intake manifold? I just want to make sure nothing has changed from the prototype photos released recently, and that we will still be able to use the existing VR38 upper intake collector.

I am uncertain whether it is the upper or lower intake manifold. However, I believe along with you that it will most likely be the lower intake manifold.

dont worry your investment was well spent!

christian370z · 10-29-2010, 12:38 PM

Quote:

Originally Posted by bullitt5897

I am uncertain whether it is the upper or lower intake manifold. However, I believe along with you that it will most likely be the lower intake manifold.

dont worry your investment was well spent!

Do you personally think that there will be a benefit to this intake manifold for the N/A guys? I know that the most improvement to be had is in the lower intake manifold from the looks of it, it would be my next big mod if it helped out the N/A setups too!

Slynky · 10-29-2010, 01:43 PM

Quote:

Originally Posted by bullitt5897

GTM is making their own version of the GTR Intake... There is a LOT of work involved in making this fit perfectly. Be patient... if you think you have it hard you have NO IDEA! this is my baby and I saw it a couple weeks ago for the magazine shoot and now I get to hang around the car for a whole week and cant even start her up!!!!

Seriously ! I'd be going crazy !

bullitt5897 · 10-29-2010, 02:19 PM

Quote:

Originally Posted by christian370z

Do you personally think that there will be a benefit to this intake manifold for the N/A guys? I know that the most improvement to be had is in the lower intake manifold from the looks of it, it would be my next big mod if it helped out the N/A setups too!

Christian,

I would love to be able to give you a firm answer on this. However, we are still in the fitment stage of the development of the product. Give us a few weeks with the product after we finish the fitment and we should have some base numbers.

Mike

p.s. I havent seen the difference between the stock airbox and the GTR one... However, the runners on the GTR intake are able to flow some serious air!!! I personally think that everyone will see benefits from this system.

Jquad · 10-31-2010, 01:12 PM

Quote:

Originally Posted by bullitt5897

SAM and team have been working hard to improve on the GTR intake manifold design!!!!!!! when he told me my jaw dropped! From our conversation last night they should be finishing up the mods this week and will be getting the intake ready for CAD and 3D scanning when I get back from SEMA. A week or so after that I will have the new intake and then testing begins.

My only wish is to have my car back before christmas *fingers crossed*

Sweet werd

Seb@SZ · 10-31-2010, 05:35 PM

Quote:

Originally Posted by christian370z

Do you personally think that there will be a benefit to this intake manifold for the N/A guys? I know that the most improvement to be had is in the lower intake manifold from the looks of it, it would be my next big mod if it helped out the N/A setups too!

I thought we were TT'ing your car?

10-27-2010, 07:07 PM	#646 (permalink)
WarmAndSCSI A True Z Fanatic Join Date: May 2010 Location: SLC, UT Posts: 1,671 Drives: '08 Evo X \| '10 370Z Rep Power: 18	I wish people would leave this kind of discussion to actual engine builders. 1.) The rods in the VHR are forged. I can't think of a single import V6 engine that has come with cast connecting rods since 1993. 2.) Stock Japanese crankshafts are all forged now, with little need for upgrading unless you want to stroke the engine or are pushing some serious specific output. 3.) Many newer high-performance import engines come with forged pistons, but not of the strongest 2618 alloy and instead 4032 or similar alloys. This is due to the low silicon content of 2618 causing greater piston expansion during operation. A factory engine cannot be built to proper specs with emissions and reliability in mind with 2618 alloy pistons - the piston-to-cylinder wall clearance must be very high in comparison to stock hypereutectic or 4032 alloy pistons (0.003-0.005" vs. 0.0008-0.0012" or so). That said, the forged rods that come with the VHR may or may not be strong enough to handle a certain amount of torque output. As with the rod cap fasteners as far as being able to handle abuse at a certain power level or RPM. In addition, the stock pistons - even if 4032 forged (looks are deceiving, they may still look like cast pistons) - aren't very strong given the 11:1 CR. __________________ '10 PW 370Z 7AT - wife's car - Project Raspberry Cheesecake '08 Evo X - built motor+trans \| BB-X @ 32 psi \| CH3OH \| self-built+tuned - ??? WHP '01 Galant V6 - built motor \| GT35R \| self-built+tuned - 550+ WHP (retired) Last edited by WarmAndSCSI; 10-27-2010 at 07:15 PM.

10-28-2010, 04:30 AM	#649 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,732 Drives: v8 74 260z ;) Rep Power: 7250	6 vhr rods > 8 stock chevy 350 '83 camaro rods. they aren't bad people here are running 500hp across 6 rods without problems. __________________ ANSWER PRICE LIST Answers - - - - - - - - - - - - - - - - $0.75 Answers (requiring thought) - - - - $1.25 Answers (correct) - - - - - - - - - - $12.50

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10-28-2010, 09:16 AM	#650 (permalink)
dnasty370z Base Member Join Date: Aug 2010 Location: Miami Posts: 224 Drives: 09' 370z 7AT Rep Power: 14	Is this Manifold ever gonna happen???