How much boost pressure can a built VQ37VHR withstand?

TopgunZ · 11-04-2014, 09:20 AM

Sorry just re-chiming in here. I have never tuned off pump. Always E.

That max psi is situational. The #'s may be off. That's why when I stated "I may be off here but I cant see this turbo hitting more than 21", was due to the condition of my readings.

Basically, I only had that turbo spooled up like that for a short amount of time. I never even hit 5250 to cross the two line curves. As you can see though, the torque does flatten out and the boost wasn't appearing to climb much at that point.

This reading happened because I was told incorrectly by everyone and their dog how to hook up my dual wastegates to a MBC. Everyone was wrong so my turbo basically was unrestricted and spooled as much as possible. I of course figured out how to hook it up correctly and then made 533whp 480tq on 10psi (converted to DJ).

Converting the 570 to DJ would be more like 655tq. No idea what my HP would have been but it would be over 700 for sure.

We never got to play with timing or anything cuz we couldn't run that amount of boost to map it correctly on the stock block. But I can tell you that this turbo means business! Hearing it spool at that psi was insane. Cant wait to see what it can do with a proper engine and tune.

jwick · 11-04-2014, 09:37 AM

Quote:

Originally Posted by TopgunZ

Sorry just re-chiming in here. I have never tuned off pump. Always E.

That max psi is situational. The #'s may be off. That's why when I stated "I may be off here but I cant see this turbo hitting more than 21", was due to the condition of my readings.

Basically, I only had that turbo spooled up like that for a short amount of time. I never even hit 5250 to cross the two line curves. As you can see though, the torque does flatten out and the boost wasn't appearing to climb much at that point.

This reading happened because I was told incorrectly by everyone and their dog how to hook up my dual wastegates to a MBC. Everyone was wrong so my turbo basically was unrestricted and spooled as much as possible. I of course figured out how to hook it up correctly and then made 533whp 480tq on 10psi (converted to DJ).

Converting the 570 to DJ would be more like 655tq. No idea what my HP would have been but it would be over 700 for sure.

Back up the truck! I clearly remember having a Sunday morning conversation with you about this issue and how you should have plumbed the WGs. It was post-tune so maybe your comment is prior to tuning and then maybe you did get some bad advice.

You told me that your MBC failed and you just removed it and plumbed the two lines together. That action basically welded your WGs shut because you were adding equal pressure holding them closed as you were adding to open them.

TopgunZ · 11-04-2014, 09:44 AM

Quote:

Originally Posted by jwick

Back up the truck! I clearly remember having a Sunday morning conversation with you about this issue and how you should have plumbed the WGs. It was post-tune so maybe your comment is prior to tuning and then maybe you did get some bad advice.

You told me that your MBC failed and you just removed it and plumbed the two lines together. That action basically welded your WGs shut because you were adding equal pressure holding them closed as you were adding to open them.

Jwick,

When I spoke to you, you had advised me to hook it up the same way everyone else had. Even my tuner during the dyno and the 4 guys that worked at the shop said that the way it was, was correct. So we had all assumed that the MBC was bad. I eventually figured out you leave both top ends open, T into the bottom and into the MBC. I proved this out on the street when I was able to adjust it around 2 psi over spring pressure.

By removing the MBC I was then just running off of WG spring pressure.

jwick · 11-04-2014, 10:36 AM

Quote:

Originally Posted by TopgunZ

Jwick,

When I spoke to you, you had advised me to hook it up the same way everyone else had. Even my tuner during the dyno and the 4 guys that worked at the shop said that the way it was, was correct. So we had all assumed that the MBC was bad. I eventually figured out you leave both top ends open, T into the bottom and into the MBC. I proved this out on the street when I was able to adjust it around 2 psi over spring pressure.

By removing the MBC I was then just running off of WG spring pressure.

Not true. I told you how to hook up a typical MBC with the caveat that you needed to research the requirements of your specific one because I was not familiar with it.

When you removed the MBC you told me that you plumbed those two lines off the controller together and continued the tuning session. That is definitely not running off WG pressure. I really wish I still had the diagram you sent me.

Don't take shots at people trying to help you when you didn't do the research you needed to get it right.

Sorry OP for the thread jack

TopgunZ · 11-04-2014, 10:44 AM

Quote:

Originally Posted by jwick

Not true. I told you how to hook up a typical MBC with the caveat that you needed to research the requirements of your specific one because I was not familiar with it.

When you removed the MBC you told me that you plumbed those two lines off the controller together and continued the tuning session. That is definitely not running off WG pressure. I really wish I still had the diagram you sent me.

Don't take shots at people trying to help you when you didn't do the research you needed to get it right.

Sorry OP for the thread jack

Chill out man. When exactly in this thread did I "take a shot at you". I said "everybody and their dog" and not, "Jwick and everybody else". Then you chimed in defending yourself, whom I didn't even mention, putting yourself in the spotlight.

Yeah I totally threw your name under the bus here.

BBRSpeedWorks · 11-04-2014, 09:40 AM

Quote:

Originally Posted by TopgunZ

Sorry just re-chiming in here. I have never tuned off pump. Always E.

That max psi is situational. The #'s may be off. That's why when I stated "I may be off here but I cant see this turbo hitting more than 21", was due to the condition of my readings.

Basically, I only had that turbo spooled up like that for a short amount of time. I never even hit 5250 to cross the two line curves. As you can see though, the torque does flatten out and the boost wasn't appearing to climb much at that point.

This reading happened because I was told incorrectly by everyone and their dog how to hook up my dual wastegates to a MBC. Everyone was wrong so my turbo basically was unrestricted and spooled as much as possible. I of course figured out how to hook it up correctly and then made 533whp 480tq on 10psi (converted to DJ).

Converting the 570 to DJ would be more like 655tq. No idea what my HP would have been but it would be over 700 for sure.

We never got to play with timing or anything cuz we couldn't run that amount of boost to map it correctly on the stock block. But I can tell you that this turbo means business! Hearing it spool at that psi was insane. Cant wait to see what it can do with a proper engine and tune.

I hope you don't think I was coming of wrong. I wasn't trying to. but the reason I don't think it was maxed it never fell off..maybe ur waste just opened at 20 cuz it held right there till the end of your run...and that was a stock wtf...lol..

TopgunZ · 11-04-2014, 09:47 AM

Quote:

Originally Posted by BBRSpeedWorks

I hope you don't think I was coming of wrong. I wasn't trying to. but the reason I don't think it was maxed it never fell off..maybe ur waste just opened at 20 cuz it held right there till the end of your run...and that was a stock wtf...lol..

Absolutely not man. I was just simply stating the condition of my pull. Like I said, it could have raised with a proper full pull. I was only able to pull into the high 4K range. Plus my injectors were at 110% duty cycle...LOl.. Amazed it held together even at that low rpm's. It may have been still climbing in psi and im sure it could have hit 2 to 3 more. The graph is what it is. I looked at it as kind of plateauing around that 20 range though. Maybe im looking at it wrong.

11-04-2014, 09:20 AM	#1 (permalink)
TopgunZ A True Z Fanatic Join Date: Jun 2012 Location: Minneapolis Posts: 2,651 Drives: 06 350Z , 09 370Z MT Rep Power: 6834	Sorry just re-chiming in here. I have never tuned off pump. Always E. That max psi is situational. The #'s may be off. That's why when I stated "I may be off here but I cant see this turbo hitting more than 21", was due to the condition of my readings. Basically, I only had that turbo spooled up like that for a short amount of time. I never even hit 5250 to cross the two line curves. As you can see though, the torque does flatten out and the boost wasn't appearing to climb much at that point. This reading happened because I was told incorrectly by everyone and their dog how to hook up my dual wastegates to a MBC. Everyone was wrong so my turbo basically was unrestricted and spooled as much as possible. I of course figured out how to hook it up correctly and then made 533whp 480tq on 10psi (converted to DJ). Converting the 570 to DJ would be more like 655tq. No idea what my HP would have been but it would be over 700 for sure. We never got to play with timing or anything cuz we couldn't run that amount of boost to map it correctly on the stock block. But I can tell you that this turbo means business! Hearing it spool at that psi was insane. Cant wait to see what it can do with a proper engine and tune. __________________ ROTREX SUPERCHARGER TUNER KITS - $6799/ CUSTOM STILLEN AIR TO AIR KITS -$2100/ 700+ WHP!! WWW.TOPGUNSPEEDWORKS.COM Last edited by TopgunZ; 11-04-2014 at 09:26 AM.

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