True or False

 
Old 06-15-2010, 11:14 AM
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Default True or False

Figure this is the best place to ask this even though its a 1jz lol.

High compression Street Turbo motors Dont last as long as stock compression? (8.5:1)

Debate I had earlier when I mentioned wanting to do a 10 something to 1 C/r all e85 setup.

Consensus was the motor just wouldn't last as long particularly in the bottom end like rings and bearings. just because of the additional stress Higher compression adds to the parts. BS or some truth?
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Old 06-15-2010, 11:21 AM
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High compression typically don't last under boost...if your doing a street car I wouldnt do high compression if you want reliable
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Old 06-15-2010, 11:22 AM
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All e85 though, no pump gas
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Old 06-15-2010, 11:23 AM
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I still wouldn't do it personally like I said its your call will the car run and go yes will it haul probally but will it last not as long as low compression no
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Old 06-15-2010, 11:26 AM
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explain why.
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Old 06-15-2010, 11:29 AM
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First off I'm not a fan of E85 personal choice and I'm not a tech it's just been proven over years and years high compression and forced induction just doesn't work together. Your not the first one who wants to do this believe me but let me ask you a question its a pretty simple theory that I'm sure everyone on this board has thought about doing it...however no one has...there's a reason for that it doesn't work
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Old 06-15-2010, 11:34 AM
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Old 06-15-2010, 12:37 PM
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Default Re: True or False

Originally Posted by flatblackhatch View Post
I don't understand why the two diffrent motors would matter. For one if you plan on racing from stop light to stop sighn of course it won't last no matter what compression there bound to fail. If you have a 10:1 compression with a big turbo it won't make boost under 4000 rpm so if you daily it and don't drive like a jack *** the motor will last a long time.
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Old 06-15-2010, 12:46 PM
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Default Re: True or False

a good friend that races in EFI Renegade Street has always told me like this in terms of that.

with variables (more boost, higher comp, nitrous) your safe tuning window gets very small.

while it may work, you have little room for error.

and i am trying to remember people saying that the e85 from service stations is very inconsistent.

not saying it wont work, how long still remains the question.
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Old 06-15-2010, 05:07 PM
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Default Re: True or False

2JZ NA engines use 10:1 CR. A local here has been runing his setup with E85 on 12 lbs. He is a 6sp converted setup and makes over 350 whp. Engine has well over 100k miles on it.

Still using a dizzy but has been runing AEM EMS (yuck) on it. The next buildup he is planning to go with GTE pistons in a 2JZ-GE VVT-i with BC 264 vvt-i cams. The head gasket will be the stock 2JZ-GE to net 9.5:1. The switch over to wastefire ignition from the dizzy should help with a better controlled spark. He plans to push about 20 lbs. on that setup.

There are too many factors to consider about the buildup. I know that there have been guys running over 10:1 with lots of boost on the salt flats. I wouldn't have it on a street driven vehicle.

The bottom end of the JZ engines can take a lot and laugh at you in the process. The bearings are the largest compared to almost any engine out there. Rings don't wear out as easily as Honda rings so you won't see yourself have any issues with excessive blowby.
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