want to run more then 15psi on stock turbos. cant make more boost thoug
09-17-07, 02:37 PM
#26
I have had no such problems. I've only had one of those little plastic check valves in front of the UIM split apart, which happened at a drag racing event where I should have won $200 cause I easily had the fastest car in the 6 cyl. class until the final round when I got that boost leak. And a couple of times a vacuum hose came off that black plastic pressure chamber in front of the UIM, I put a zip tie on that one hose and neither has come off recently.
09-17-07, 02:45 PM
#27
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The thing With the BNR's is that you can run 18 psi with them all day unlike the stockers who honestly start to shed to **** after 15 psi. Even though you said you've been running yours on 15 psi which good but just like you said they wont last for long. Its just reliability if you ask me. Your forcing the stock twins. With the BNR's your not forcing them, they want to spin at 18 psi 
Countless stockers have bee blown up, **** i just blew mine up but i dont ever remember hearing a set of stage 3's seq or non seq blowing up.
Countless stockers have bee blown up, **** i just blew mine up but i dont ever remember hearing a set of stage 3's seq or non seq blowing up.
09-17-07, 02:52 PM
#28
Since the BNRs are 20% larger, I'm sure they will make more airflow at the same boost level as the stocks, so more hp, that's one reason I've been thinking I may want those instead of a single in the future. I like the sequential twins for street driving, although I haven't driven a single turbo. I don't like how they feel when non-sequential, like when you boost past 5k, then let off the gas but don't let the revs drop below 3k, and then floor it, more boost lag that way.
How or why did yours blow up, any reason?
How or why did yours blow up, any reason?
09-17-07, 03:04 PM
#29
Eats, Sleeps, Dreams Rotary
Thread Starter
u can get they same or close to the same performance from the stockers. albeit u can run the bnrs daily at higher boost though. but u dont need a 18/19psi setting on any turbo all the time in my opinion.
also....lets see....spend 2500 bucks for 20 rwhp with the bnrs or spend 4k for 150rwhp from a single. no brainer. you have ur opinbion and i have mine.
also....lets see....spend 2500 bucks for 20 rwhp with the bnrs or spend 4k for 150rwhp from a single. no brainer. you have ur opinbion and i have mine.
09-17-07, 03:09 PM
#30
Eats, Sleeps, Dreams Rotary
Thread Starter
I think there is a chance it has to do with the boost control, although you could be right.
matty, did you get rid of the stock intercooler and the cat? I assume you did get rid of the stock IC, you probably need to get rid of the stock cat if you still have that.
I have a full exhaust with a resonated mid pipe (high flow muffler welded into mid pipe), and I never ported the wastegate and I don't have any problems controlling the high boost levels. Maybe you only need to port the wastegate to keep the boost levels low, I'm not sure.
matty, did you get rid of the stock intercooler and the cat? I assume you did get rid of the stock IC, you probably need to get rid of the stock cat if you still have that.
I have a full exhaust with a resonated mid pipe (high flow muffler welded into mid pipe), and I never ported the wastegate and I don't have any problems controlling the high boost levels. Maybe you only need to port the wastegate to keep the boost levels low, I'm not sure.
my wastegate is stock..no need to port it for me too.
my power fc controls my boost...i have a 12 psi setting and a 15psi setting. it controls boost perfectly. why it cant make more boost i have no clue buit i9 doubt its the pfc boost controllers fault. if it was then i wouldnt be able to change from 12 to 15 or whatever.its making more then 15psi thats the problem.
Does anyone have a power fc and is running more then 15 psi..if so post up your boost settings.
09-17-07, 03:10 PM
#31
Eats, Sleeps, Dreams Rotary
Thread Starter
so youve been running these twins at 15psi for a long time.. I may be wrong but ive read countless posts that they wont last long at that boost level... not flaming just curious, has the rules changed?? if so I want to run my non sequential twins at 16-17psi!! since i dont drive it much anyways but maybe 5000 miles a year max!! with no drag strip use why not??!!
crank up the boost....just make sure u have enough fuel.
09-17-07, 03:12 PM
#32
Eats, Sleeps, Dreams Rotary
Thread Starter
I have been for 1-2 years, and countless runs at the drag strip. If you got a Power FC, fuel system (850s and 1600s), FMIC, wideband to tune AFR yourself so you don't run lean, and maybe some more mods I'm not thinking of, then I guess your good to go like me. you can run 16-17 on stock map sensor too. Oh and I only run 93 pump gas too (too bad they got rid of 94 at the local Sunocos), but I just ordered a AEM water/methanol injection kit for safety and hopefully a little more power. 105k miles
09-17-07, 03:13 PM
#33
Eats, Sleeps, Dreams Rotary
Thread Starter
what are u talking about?
09-17-07, 03:18 PM
#34
Eats, Sleeps, Dreams Rotary
Thread Starter
Since the BNRs are 20% larger, I'm sure they will make more airflow at the same boost level as the stocks, so more hp, that's one reason I've been thinking I may want those instead of a single in the future. I like the sequential twins for street driving, although I haven't driven a single turbo. I don't like how they feel when non-sequential, like when you boost past 5k, then let off the gas but don't let the revs drop below 3k, and then floor it, more boost lag that way.
How or why did yours blow up, any reason?
How or why did yours blow up, any reason?
i like sequential too for the street. but from what i have read over the past 2-3yrs is that the bnrs have only done some impressive stuff in non seq mode. people are getting 360-380 in seq on the bnrs....and as we know tons of guys make 360 on the twins at 15psi...i am one for for 5 yrs.
anyways screw the bnrs lets get back on subject....i;de like to hear from some others who run high boost on the stockers....is jodeny around or mrrx7tt.....anyone??
i am going for a ride....gonna try to crank the boost in this cooler weather....will be back soon. hehhe....she gonna blow...lol?
09-17-07, 03:22 PM
#35
Nope. My last run at the track I turned up the boost a little, when I was in 4th gear I looked and the boost gauge was at 20, I looked at my wideband and it said 11.4 AFR, and my greddy boost controller said the max boost was 20.2. And I had the PFC on map tracer and I was in the 2nd to last row at the bottom. And at 17-19psi I always see 11.1 to 11.4 AFR..
So it does confuse me a little that I was able to run that much boost without leaning out, when people say the map sensor is good up to 17 psi. Maybe the turbos are not pushing much more air at 20 compared to 18psi.
So it does confuse me a little that I was able to run that much boost without leaning out, when people say the map sensor is good up to 17 psi. Maybe the turbos are not pushing much more air at 20 compared to 18psi.
09-17-07, 03:36 PM
#37
My PowerFC boost settings are 1.30 and 20% Maybe try adjusting the % number also.
And my PIM volt value for 4.5 volts is 103.1%, 4v is 101.9%
PIM 8k and 7k rpms is 107%
That's so there is more fuel injected at those higher boost levels so I don't lean out. And the INJ map numbers were increased too.
And my PIM volt value for 4.5 volts is 103.1%, 4v is 101.9%
PIM 8k and 7k rpms is 107%
That's so there is more fuel injected at those higher boost levels so I don't lean out. And the INJ map numbers were increased too.
09-17-07, 04:22 PM
#39
when I get my apexi 3 bar map sensor (ordered last night), my AEM Methanol/water injection kit (ordered last night), 99 spec y-pipe, and I think I will run some sunoco race gas. Might need some 4.30 gears to do it
09-17-07, 06:22 PM
#40
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Cool, now I know I can go up to 23psi and possibly run a 10.9 ET when I get my apexi 3 bar map sensor (ordered last night), my AEM Methanol/water injection kit (ordered last night), 99 spec y-pipe, and I think I will run some sunoco race gas. Might need some 4.30 gears to do it
when I get my apexi 3 bar map sensor (ordered last night), my AEM Methanol/water injection kit (ordered last night), 99 spec y-pipe, and I think I will run some sunoco race gas. Might need some 4.30 gears to do it
09-17-07, 06:28 PM
#41
93 pump gas. I'm getting the water/methanol inj. for detonation safety and hopefully some more hp. The race gas I used a couple of times killed my wideband 02 sensors, but I think I found a sunoco that has unleaded race gas that doesn't hurt the sensors, so I may start using some of that too. Mine is tuned for pump gas.
09-17-07, 07:05 PM
#42
Eats, Sleeps, Dreams Rotary
Thread Starter
i just tried to raise it again to 1.15 and 88% (i use pfc to control boost thats why % is alot higher) and still see only 1.03 peak. i see about 1.03 as peak even when its set to 1.05 and 78% or 80%. something is limiting me. even a couple yrs back when i tried to raise it i couldnt. this is annoying.
curious quest....does your power fc and profec b both read the same as far as peak is concerned?
09-17-07, 07:07 PM
#43
Eats, Sleeps, Dreams Rotary
Thread Starter
what are u using to control boost?
did u have trouble gettign mroe then 15psi?
what is your peak boost value on the power fc?
09-17-07, 07:39 PM
#44
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I don't understand how you guys are running more than 17psi on the stock map sensor with out blowing up your motors. The Power FC has to be tuned and mapped for boost above 16/17psi and unless you did and have a 3 bar map sensor then you should be fine. Its a well known fact that the factory map sensor is in accurate above 16/17 psi. Maybe someone else can chime in and explain this phenominon to me.
R.K.
R.K.
09-17-07, 07:55 PM
#45
Eats, Sleeps, Dreams Rotary
Thread Starter
I don't understand how you guys are running more than 17psi on the stock map sensor with out blowing up your motors. The Power FC has to be tuned and mapped for boost above 16/17psi and unless you did and have a 3 bar map sensor then you should be fine. Its a well known fact that the factory map sensor is in accurate above 16/17 psi. Maybe someone else can chime in and explain this phenominon to me.
R.K.
R.K.
Yeah i thought u needed a 3 bar map sensor to run that kind of boost too.
09-17-07, 08:43 PM
#46
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R.K.
09-17-07, 08:52 PM
#47
Doritos on a toothpick
i run 15.5psi on my stockers....but occasionally see over 16 when feelin frisky.. 
....i run the Blitz SBC-iD.....and a stock ECU...FCD, with AIC and 2x720's...supra pump....
....i run the Blitz SBC-iD.....and a stock ECU...FCD, with AIC and 2x720's...supra pump....
Last edited by BoostCrzy; 09-17-07 at 09:06 PM.
09-17-07, 09:11 PM
#48
nope 2nd gear gets same. maybe slightly lower.its normal to get lower boost in lower gears as u said.
i just tried to raise it again to 1.15 and 88% (i use pfc to control boost thats why % is alot higher) and still see only 1.03 peak. i see about 1.03 as peak even when its set to 1.05 and 78% or 80%. something is limiting me. even a couple yrs back when i tried to raise it i couldnt. this is annoying.
curious quest....does your power fc and profec b both read the same as far as peak is concerned?
i just tried to raise it again to 1.15 and 88% (i use pfc to control boost thats why % is alot higher) and still see only 1.03 peak. i see about 1.03 as peak even when its set to 1.05 and 78% or 80%. something is limiting me. even a couple yrs back when i tried to raise it i couldnt. this is annoying.
curious quest....does your power fc and profec b both read the same as far as peak is concerned?
I went out today, 19 max psi on my Greddy profec b and it read 1.18 max on the power fc.
Remember the Power FC is not accurate and reads lower than the actual boost pressure, so maybe I can run 19psi because the map sensor or Power FC thinks that is about 17psi, so any boost levels above that and it will read the same amount, this is why I don't want to go any higher than 19 or 20 without the 3 bar map sensor. I forgot to do the sensor check and see what the voltage was when I was under full boost, I should do that and see what it reads.
09-17-07, 09:35 PM
#49
And if I run around 17psi, in map tracer mode it is on the P18 row, 2 rows from the bottom. When I run 19 psi, the map goes down to the P19 row. This is how I know the map sensor is reading more boost than 17 psi, so the PowerFC does know the pressure is increasing so it does add more fuel according to the P19 row in the Inj map. 19 psi as shown on the profec b and boost gauge is actually like only 17psi according to the Power FC (it doesn't read the correct actual pressure). This is probably why I am able to run 19-20 psi without a problem. Now I can see how anything above actual 20 psi would be a problem, the stock map sensor probably won't read any pressure higher than what I'm currently running.
