15 psi on pump gas with BNRs or Stockers
Let's get a vote from the vets here
what is the risk level associated with running 15 psi on a ported engine, upgraded IC (at least M2 med), free flowing exhaust (straight through style with baffles only) and all fuel upgrades with Power FC (PLENTY of fuel, high 10s to low 11s AFR) I've been told anything above 14 psi and you are rolling the dice with 93 octane pump gas...opinions/experience? |
Just get some AI if your worried.
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Ive never heard that over 14PSI is not good on 93. As long as it is tuned right there shouldn't be a problem. 15 pounds is a lot for the stock turbos though.
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I thought 15 or 16psi was the limit to 93 octane, but now gas stations all have ethanol in the gas. Which could lower the chances for detonation.
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Are we talking Rx-7's specifically or all turbo cars?
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Originally Posted by skir2222
(Post 7931954)
I thought 15 or 16psi was the limit to 93 octane, but now gas stations all have ethanol in the gas. Which could lower the chances for detonation.
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Originally Posted by skir2222
(Post 7931954)
I thought 15 or 16psi was the limit to 93 octane, but now gas stations all have ethanol in the gas. Which could lower the chances for detonation.
I have my low boost setting on 10 and high on 15 but not with twins. I have not had any problems so far. |
Originally Posted by mikeric
(Post 7932441)
Yeah, please back this up with some supporting data.
I have my low boost setting on 10 and high on 15 but not with twins. I have not had any problems so far. |
Maybe this is only in NJ, I don't know. Have you guys checked out Tom94RX7, he runs 19psi on stock twins and pump.
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The stock twins won't last long at elevated boost levels, but it can be done. I ran about 16 psi for 2 years before I started seeing excessive shaft play. If you plan to do it for extended periods then go for an upgrade. There comes a point where you are just generating more heat than relevant power. The stock twins are really out of their efficiency range so I don't feel it is a good idea.
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Originally Posted by Rotary Experiment Seven
(Post 7932791)
The stock twins won't last long at elevated boost levels, but it can be done. I ran about 16 psi for 2 years before I started seeing excessive shaft play. If you plan to do it for extended periods then go for an upgrade. There comes a point where you are just generating more heat than relevant power. The stock twins are really out of their efficiency range so I don't feel it is a good idea.
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Originally Posted by skir2222
(Post 7932556)
You should look at the gas pump next time you fill up, all the gas stations I have been to. I have seen a sticker on the pump that states there is a percentage of ethanol in the gas(10%).
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Originally Posted by Rotary Experiment Seven
(Post 7932791)
I ran about 16 psi for 2 years before I started seeing excessive shaft play.
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Originally Posted by 2007 ZX-10R
(Post 7932437)
news to me (that all gas now has ethanol)
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I run 15 to 16 but mix a few gallons of 100 in to up octane a bit. Like 4 gallons per fill up. No problems for 12000 miles. I have changed out a set of turbos at 7000. I am running a used set for $200 right now. They old set had 60k on them previously.
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Originally Posted by fendamonky
(Post 7934175)
I believe they instituted it about a year or so ago... all gas in the states is now 10% Ethanol.
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I ran my twins at 15 psi for about 15k miles (from 75k to 90k) until they blew.
There are a lot of variables involved......my attitude was, 'let's see how long the little bastards will last' :lol: |
stock twins wont last long on 14+psi , i ran my 13b with 60-1 and 20psi on pump for months without problems , its all in the tunning
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Originally Posted by GoodfellaFD3S
(Post 7937711)
I ran my twins at 15 psi for about 15k miles (from 75k to 90k) until they blew.
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detonation, air-fuel ratios, & alcohol/ethanol
Originally Posted by skir2222
(Post 7931954)
I thought 15 or 16psi was the limit to 93 octane, but now gas stations all have ethanol in the gas. Which could lower the chances for detonation.
https://www.rx7club.com/showthread.p...ght=enrichment |
heck if you have a good ignition, 93 octane, a excellent intercooler.. i dont see why you couldnt run safely 15psi on the twins for a while.. as long as you have a good tune.. Id like to try it.
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actually I'm running BNR Stage 2s which should be a little more efficient than the stockers at 15 psi
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what are the stage 2's like? do they have the 360 degree bearing same as the stage 3's?
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nope, and Bryan doesn't make them anymore, but they spool faster than the Stage 3s
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Stage 2s have upgraded compressor wheels. They spool faster than the 'new' stage 3s (brian's only current offering) because of the smaller stock turbine wheels, vs the larger beefier turbine wheels of the new 3s.
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