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      09-25-2020, 10:38 PM   #1
darkrom
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Hp numbers on 93 octane with various setups?

Are there many people with upgraded twins or single turbos that either run 93 octane only, or 93 + meth?

What's your setup and what do you dyno? No e85 around this region so I'm trying to figure out which direction I want to take my 135 (N54) next year after the winter.

I want to know how limited I will be with 93 octane.
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      09-26-2020, 10:01 PM   #2
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I've got stg2 twins. I do have an e85 tune im supposed to be working on with motiv but e85 is a pain here as well and the 1 station is 45 min away. So I haven't done any logs for it. Plus my car on 93 oct holds pretty much 23 psi to redline and its plenty fast for me. Dyno numbers I dont know and doubt I ever will. But my guess( someone who's had several cars in the 350-450 hp range) its around 500 to the wheels. It could be less than that with better torque than im used to. Don't think you can get much more power from pump gas from these engines.
Plus I feel your really going to stress that engine out with any more power. But that's just me.
Let us know which way you go.
I bought RB "the twos" and nearing 7500 miles on them I couldn't be happier
Good luck
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      09-26-2020, 11:42 PM   #3
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Quote:
Originally Posted by Petro135 View Post
I've got stg2 twins. I do have an e85 tune im supposed to be working on with motiv but e85 is a pain here as well and the 1 station is 45 min away. So I haven't done any logs for it. Plus my car on 93 oct holds pretty much 23 psi to redline and its plenty fast for me. Dyno numbers I dont know and doubt I ever will. But my guess( someone who's had several cars in the 350-450 hp range) its around 500 to the wheels. It could be less than that with better torque than im used to. Don't think you can get much more power from pump gas from these engines.
Plus I feel your really going to stress that engine out with any more power. But that's just me.
Let us know which way you go.
I bought RB "the twos" and nearing 7500 miles on them I couldn't be happier
Good luck
I'm just wondering if it's worth it then on pump gas.


How much higher does meth raise that ceiling? I have a jb4 installed but disabled so I can run MHD stage 2+ v9 map. I find the car doesn't stumble and throw CEL like it does with the jb4 on and the backend flash. It seems smoother all around as well. I only have jb4 installed so I can have no lift shift, which I'm understanding hasn't been accomplished by flash only yet correct?

Is it possible to use the jb4 as a meth controller without using it in place of the MHD tune? What's the safest meth setup these days do you know?

E85 just isn't an option where I'm at or it would be my first choice.
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      09-27-2020, 05:10 AM   #4
Petro135
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I like the straight up 93oct. Never thought about meth for my car. My hopes were to make it fast enough to keep me happy without ethanol or meth. For now I'm there but I am moving soon and if there is more e85 stations around me, that could change.
As far as tune. My good friend has been using jb4 for along time and always complained about it, now he has recently pulled it out of his car. When i got my car he told me to go straight to mhd and not touch a jb4. I listened so i really know nothing about it.
If i was in your shoes I'd settle the turbos first, then get a custom tune for them, then worry about meth or eth, down the road. See how you like 93 oct on upgraded turbos first. It only cost $100 add on for another map through most tuners after you pay for the 93 map and do lots of logs.
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      10-11-2020, 06:30 PM   #5
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What about single turbo setups on 93 or 93+meth
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      10-12-2020, 01:12 PM   #6
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Still think twins are best. I have a different setup with ported N53 head cams and big twins aiming for 550-625 on 93 should be about 15-18psi

You're gonna need a custom tune regardless.

Jb4/custom BEF vs MHF only is your/your tuners choice.
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