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How much boost are you stock internals 3rd gen guys using on pump gas?

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Old 05-21-08, 10:39 PM
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How much boost are you stock internals 3rd gen guys using on pump gas?

Just curious what boost levels you guys are using for daily driving and using pump gas. Also what octane because in Cali high octane pump is 91 and what turbo are you running. I am asking because I will be dropping a stock FD motor into my FB with a single turbo 60 trim and want the motor to last until at least the end of the year.

So here is what I need to know?
1. boost?
2. Octane?
3. turbo?
4. Miles on the motor?

Thanks.
Old 05-21-08, 10:56 PM
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Stock internals? We can actually upgrade our internals? Blasphemy! Ceramic apex seals that can handle 2 detonations yay! Just wondering if I am wrong.
Old 05-21-08, 11:04 PM
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Originally Posted by FallenCho
Stock internals? We can actually upgrade our internals? Blasphemy! Ceramic apex seals that can handle 2 detonations yay! Just wondering if I am wrong.
Old 05-21-08, 11:25 PM
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Only thing I can think of is porting thats all I know of that can increase performance..
Old 05-21-08, 11:30 PM
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Originally Posted by Hit Redline
So here is what I need to know?
1. boost?
2. Octane?
3. turbo?
4. Miles on the motor?
*10 psi
*93 octane
*Stock sequenitlal twins
*About 87k before coolant seal failure...now about 850 into break-in.
Old 05-21-08, 11:34 PM
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On that 91 octane **** gas, I wouldnt run much more than 13 psi.

I run 17 psi on 93 octane with water injection on my 500R/67mm single.

Edit: unless you're changing your compression ration somehow, it doesnt matter if your internals are stock or not wrt 'safe' boost on pump gas.

Last edited by GoodfellaFD3S; 05-21-08 at 11:44 PM.
Old 05-21-08, 11:35 PM
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Originally Posted by Hit Redline
So here is what I need to know?
1. boost?
2. Octane?
3. turbo?
4. Miles on the motor?
1.) 15lbs
2.) 10 gal 100 octane, 6-8 gal 91 octane
3.) Stock Seq Twins
4.)8500 with new housings, rotors, plates
Old 05-21-08, 11:35 PM
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Originally Posted by GoodfellaFD3S
On that 91 octane **** gas, I wouldnt run much more than 13 psi.

I run 17 psi on 93 octane with water injection on my 500R/67mm single.
You have stock internals?
Old 05-21-08, 11:36 PM
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Originally Posted by Sgtblue
*10 psi
*93 octane
*Stock sequenitlal twins
*About 87k before coolant seal failure...now about 850 into break-in.

Thanks. I was beginning to wonder about the 3rd gen section.
Old 05-21-08, 11:40 PM
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I did 32k on a reman till the pickup tube got clogged by the oil pan gasket and the motor ate itself.... So far got 3k on my ported motor with black seals from JPR Imports
Old 05-21-08, 11:44 PM
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Originally Posted by GoodfellaFD3S
On that 91 octane **** gas, I wouldnt run much more than 13 psi.

I run 17 psi on 93 octane with water injection on my 500R/67mm single.
We do have have some pumps were we can get 100 octane its up to $7 a gallon. I was using methanol injection to compensate for the 91 and will be doing it on my new motor as well.

17 psi on 93? How long has your motor lasted?
Old 05-21-08, 11:45 PM
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Originally Posted by skir2222
I did 32k on a reman till the pickup tube got clogged by the oil pan gasket and the motor ate itself.... So far got 3k on my ported motor with black seals from JPR Imports
What turbo and boost level?
Old 05-22-08, 12:11 AM
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Originally Posted by Hit Redline
We do have have some pumps were we can get 100 octane its up to $7 a gallon. I was using methanol injection to compensate for the 91 and will be doing it on my new motor as well.
What about AVgas? I would think it would be pretty easy to come by and would be a lot cheaper than $7. Of course, it has been a lot of years since I filled an aircraft at an FBO, but it might be worth checking out if you have a general aviation airport nearby.
Old 05-22-08, 12:18 AM
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1. boost = 13 psi
2. Octane = 91 pump biatch! (yes it sucks)
3. turbo = stock non-sequential twins
4. Miles on the motor = 10,000 (with a few lean runs, overboosts, and a lot of... abuse... it seems to like it )

See my sig for vids if you want some proof.
Old 05-22-08, 12:43 AM
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Originally Posted by mdpalmer
1. boost = 13 psi
2. Octane = 91 pump biatch! (yes it sucks)
3. turbo = stock non-sequential twins
4. Miles on the motor = 10,000 (with a few lean runs, overboosts, and a lot of... abuse... it seems to like it )

See my sig for vids if you want some proof.
Cool vids. I will be hitting the track this summer once I get my car running again. I will be doing both drag and road course.

what ecu are you running? looks like pfc
Old 05-22-08, 09:29 AM
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larger turbos can run a bit higher psi then the stock turbos because they are at a higher efficiency and dont heat the intake charge as much which is more likely to lead to detonation/preignition
Old 05-22-08, 02:36 PM
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Originally Posted by Dudemaaanownsanrx7
larger turbos can run a bit higher psi then the stock turbos because they are at a higher efficiency and dont heat the intake charge as much which is more likely to lead to detonation/preignition
Not true. Intake temps really aren't dependant on your type of turbo. That is, not when compared to the major factors of:
1)Compression pressure. The more you compress air, the hotter it gets.
2)Intercooler efficiency
Old 05-22-08, 02:56 PM
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So here is what I need to know?
1. boost?
2. Octane?
3. turbo?
4. Miles on the motor?

Thanks.[/QUOTE]

1.) 18lbs
2.) 93
3.) t70-1
4.) 7k
Old 05-22-08, 03:28 PM
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So here is what I need to know?
1. boost?
2. Octane?
3. turbo?
4. Miles on the motor?

1. 12psi
2. 91oct
3. stock twins
4. ~30k
Old 05-22-08, 03:44 PM
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1) .8 bar and 1.1 bar (depending on how much fuel I feel like burning)
2) 94 Octane
3) BNR Stage 3
4) About 20k

I'm running completely stock internals (as far as I know) and pulling very nice compression still (8.6-9.0). I think boost pressure capability has more to do with adequate fuel and efficient cooling. So long as you can keep the AFRs around 10.5-11.0 while under full boost w/o running out of IDC and keep intake temps below 50 C (highest) you should be fine.

10psi @ 15 AFR's under boost with 70+ C intake temps will be MUCH more likely to make your engine go pop than 20psi @ 10.5 AFR with intake temps in the 30's. Provided you have proper cooling and support modifications.

Just my $.02
Old 05-22-08, 04:17 PM
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1) 10psi
2) 93 octane
3) twins seq
4) 53k
Old 05-22-08, 04:25 PM
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Originally Posted by Hit Redline
Thanks. I was beginning to wonder about the 3rd gen section.

you're the one who said "stock internals" like we have a headgasket or rods that break at a certain boost or power level.

i clicked this thread expecting to read "how much boost can a rotary run without blowing up?"
"uhhh, as much as you want as long as you keep it from detonating."
Old 05-22-08, 06:22 PM
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7psi
93 octane
t04z single turbo
40k
Old 05-22-08, 07:57 PM
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Originally Posted by jacobcartmill
you're the one who said "stock internals" like we have a headgasket or rods that break at a certain boost or power level.

i clicked this thread expecting to read "how much boost can a rotary run without blowing up?"
"uhhh, as much as you want as long as you keep it from detonating."
Sorry, guess I just meant a stock motor. No porting or upgraded apex seals. Thanks for your input.
Old 05-22-08, 08:48 PM
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10-8-10 (I think), stock boost pattern
CA 91 octane
Stock sequential twins
96 K miles on original, stock engine


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