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it goes way back. it was a major problem with DE's and effected all the early builds. Guys were chasing all kinds of non-existent issues like boiling coolant etc trying to figure out why it was happening. Some were even going so far as replacing the coolant plugs in the head with giant allen bolts and torquing them down to create pressure on the headgaskets between the cylinders (LOL). Eventually everyone went to 1/2" headstuds, boom, problem solved. Until the L19s came out which allowed getting real torque on the head studs without drilling and tapping the block.
I forget, what is the torque spec on the standard ARP? 65-75lb ft? Thats not going to cut it. At least, it didnt on my 350z. Made it about 5-6 blocks from the dyno. Then I swapped the block for one that was drilled and tapped for 1/2" studs, and now we are about 10 years since that engine went in the car and its still doing great! So, I like to get about 90-95ft lb on the headstuds (with moly lube). |
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So how did you get that conversion made? I'm very interested! Please do share! |
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On topic; OP I must agree with my man Charles though approach boosting your factory block. Hell I would still be on my factory block had I had a competent tune done. After having rebuild both my DE and VHR blocks now I can tell you there are several stout improvements in our block. I can assure you technology in both the bottom and top end of the block in our car has definitely been improved. |
85ft lbs should be good to go. Perhaps they raised the torque specs or changed material of their standard studs to allow more torque? Because I am pretty sure that the stud threads and length and everything are the same as the DE arent they? Its been many years, its just burned into my brain that all the 2003-2004 DE builds were blowing headgaskets with the normal ones and then it became a non-issue when we all went to 1/2" threads.
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My built engine was a big investment, but siting at nearly 600whp at 13lbs boost on 91 octagon fuel is very nice. It makes me comfortable I can beat on the engine on hot hot days without worry.
When I upgrade my fuel system to deal with any starvation I will push her higher to 18ish. 650-700whp should be fun. |
One of the reasons people build their engines is to drop compression to a decent enough level for boost. The OEM compression ratio is too high for pump fuel.
You also need to keep in mind that traction is a major issue on our cars, and the increased torque makes breaking parts in your drivetrain much easier. If you're building a dyno queen you'll be fine but anything you plan to race requires serious consideration in terms of traction and strength. |
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Thanks! |
But see he's a 7AT, where are you going ro get the valvebody to help your tanny hold all that torque??? As far as I've read through here our 7At tranny can only hold up to 400 torque and that's pushing it if it was on a good tune? Unless I missed something please elaborate as I too plan on going boosted...Btw between ID's and Bosch injectors whoch would you go with and what about Deatschwerks??? I plan on going with 1000cc for E85..
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I am running 13PSI peak (settles in around 12.5 under most scenarios). I had to upgrade to the CJM return fuel system to be able to support fueling at that boost (the stock system would drop ~15psi under boost). Car has been running great. Nissan did right with these engines in my book.
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So, getting back to topic - how much boost pressure can a built VQ37VHR withstand? :) 16,17 psi ?
Mine block is 9.0:1, arps l19, without e85 or water/meth injection. Isn't the stock intake plenum the max limiter of boost we can go with? |
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That's not a question that can be answered without a lot more info. 25 psi out of a tiny turbo is a lot less air than 25 psi out of a large one. The motor may hold up fine with 15 psi out of a gt28 and explode at 15 psi out of a gt42. |
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