I've been screwed over! High Compression/TT/E85 only option.
#1
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I've been screwed over! High Compression/TT/E85 only option.
Almost two year ago my built VQ35DE TT hydrolocked and bent a connecting rod @ 40mph. While my car was at Lethal Performance in San Antonio, TX, the business was sold to PerformanceHQ. My car was transported without my knowledge, calls/visits were dodge by the previous owner turned manager, and my engine was in pieces for months for shop non payment. While all engine parts were order, it was soon discovered by only me that my special order Z1/Wiseco pistons were 11:1 96.5mm. Being that it has been over 20 months, there is NO way to return piston. Taking into consideration that there is no real market for .040/96.5 HCR pistons. I am stuck with upgrading to E85 for my GTM kit Garrett GT2871r's.
After doing some compression math with stock .7mm head gasket I will have a 12.1:1 compression. So my route of build will be 1200cc AUS injectors, dual AEM E85 320lph, fuel rail. My hope is to at least reach 12lbs. IDK
So my questions are:
Has anyone seen a build like this? What do you know about it? Should I get a thicker head gasket and if so what is too thick? I don't want to elongate screw holes if possible. head/motor have been worked twice. What max boost should I hope for? I know this is a lot but ANY INSIGHT WOULD HELP.
After doing some compression math with stock .7mm head gasket I will have a 12.1:1 compression. So my route of build will be 1200cc AUS injectors, dual AEM E85 320lph, fuel rail. My hope is to at least reach 12lbs. IDK
So my questions are:
Has anyone seen a build like this? What do you know about it? Should I get a thicker head gasket and if so what is too thick? I don't want to elongate screw holes if possible. head/motor have been worked twice. What max boost should I hope for? I know this is a lot but ANY INSIGHT WOULD HELP.
#3
My first question is what are your power goals? E85 with high compression and boost will be a good combo because you don't get spark knock with E85. Knock is what you have to worry about with high compression and boost. Now with that being said high compression engines will make significantly more hp per lb of boost than with a typical low compression boost combo. So you can run lower boost psi levels to make the power you want. My guess with a 320lph pump and 1200cc injectors you would be looking at around 600whp max with E85. If you want more power I would suggest going with a much larger pump or twin pump combo to keep up with the 37% more fuel E85 requires. The 1200cc injectors should be good up to around 700whp with E85. If you are looking to make more power with the setup you already have run C16 instead of E85. But that gets expensive real quick depending on how much you drive it. Good luck man keep us posted!
#4
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My first question is what are your power goals? E85 with high compression and boost will be a good combo because you don't get spark knock with E85. Knock is what you have to worry about with high compression and boost. Now with that being said high compression engines will make significantly more hp per lb of boost than with a typical low compression boost combo. So you can run lower boost psi levels to make the power you want. My guess with a 320lph pump and 1200cc injectors you would be looking at around 600whp max with E85. If you want more power I would suggest going with a much larger pump or twin pump combo to keep up with the 37% more fuel E85 requires. The 1200cc injectors should be good up to around 700whp with E85. If you are looking to make more power with the setup you already have run C16 instead of E85. But that gets expensive real quick depending on how much you drive it. Good luck man keep us posted!
#5
I'd stick with it as is and not worry about the hg's. As u know doing hg on that motor is very labor intensive. For what your going to gain going with a thicker gasket is not worth the reward in my book. Put E85 in the fuel tank tune it and call it day until u can upgrade the fuel system to make bigger power. Just my $.02.
#6
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I'd stick with it as is and not worry about the hg's. As u know doing hg on that motor is very labor intensive. For what your going to gain going with a thicker gasket is not worth the reward in my book. Put E85 in the fuel tank tune it and call it day until u can upgrade the fuel system to make bigger power. Just my $.02.
#7
I would look into doing HKS hg's. I've heard of people having problems with the Cometics. Maybe that was some time ago and they have changed since idk. U could also run the HR hg's just have to have the proper machine work done. I'm running HKS hg's and haven't had a problem. I've read about a lot of people prefering the HKS gaskets so that's what I went with.
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#9
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I didn't find HKS headgaskets for HR, so I went with Cometic v3 just recently. Got a link?
Edit: NVM, OP is a DE. I'll be doing a high compression TT HR build on E70(85), will post results once we get the motor back together and broken in.
Edit: NVM, OP is a DE. I'll be doing a high compression TT HR build on E70(85), will post results once we get the motor back together and broken in.
Last edited by Juztin; 05-25-2017 at 09:02 AM.
#10
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There is no secret; if you run high compression, pump gas, and high boost, you are asking for trouble. You can hope the knock sensor and a good tune holds it all together, but...
Race gas or E85 is the ticket for you if you can easily source either. And as stated above, use an HKS headgasket and L19s.
Race gas or E85 is the ticket for you if you can easily source either. And as stated above, use an HKS headgasket and L19s.
#12
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#16
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ok? And what's the power he is wanting to hit? -700 should be just fine, its not rocket science anymore as long as you have a good tuner.
I personally ran 10.6:1 CR at 621whp on 93 for 3 years no issues.
New build Im aiming low boost 700whp 10.5CR on 93, and then obviously much more on e85 high boost.
The only thing I can find OP is looking for is 500whp and that is peanuts on 93 with 11:1. Topspeed has tuned a few 370z with their 11:1 stock to around 650s on 93, no issues.
The question is whats his end goal, if it is 500-699whp on 93 , FontZ, I would not worry about it because personally I would not have even went below 11:1 CR. It'll make your power curve and bottom end feel great
I personally ran 10.6:1 CR at 621whp on 93 for 3 years no issues.
New build Im aiming low boost 700whp 10.5CR on 93, and then obviously much more on e85 high boost.
The only thing I can find OP is looking for is 500whp and that is peanuts on 93 with 11:1. Topspeed has tuned a few 370z with their 11:1 stock to around 650s on 93, no issues.
The question is whats his end goal, if it is 500-699whp on 93 , FontZ, I would not worry about it because personally I would not have even went below 11:1 CR. It'll make your power curve and bottom end feel great
Last edited by Nismo350z#0310; 09-19-2017 at 05:29 AM.
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