how much extra power
#1
Full Member
Thread Starter
Join Date: Jan 2008
Location: townsville australia
Posts: 74
Likes: 0
Received 0 Likes
on
0 Posts
how much extra power
i have recently installed an apexi avcr i have wound the boost up to 15 psi wat power increases do i have over running at 1o psi .2000 model with stock twins, power fc, avcr, dual pod intake, standard pre cat ,mid pipe ,4" cannon jasma exhaust,diff locker,hks 2 plate clutch
#7
Just Boosting
iTrader: (8)
At 15psi those twins are really taking a real beating that’s pushing those twins to the max. As far as KFC3S goes I sure hope he was only kidding both stock twins and fuel system cant handle no 17psi. Plus I belive he is still running the stock IC and by standard pre cat I hope he doesnt mean stock pre cat.
Trending Topics
#9
Full Member
Thread Starter
Join Date: Jan 2008
Location: townsville australia
Posts: 74
Likes: 0
Received 0 Likes
on
0 Posts
maybe the jap model especially a series 8 has an improved fuel system etc ,duty cycle is 57% to achieve 15 psi ,intake temps are around the 40-50 deg c but it is 30 degc ambient, have stock intercooler and am running 98 octane pump petrol. on my previous series 8 i ran it at 15-17 psi for about 7 months till i wrote it off, on it i forgot to remove all the pipes when i installed the avcr it boosted to 24 psi and didnt blow up
#11
Full Member
Thread Starter
Join Date: Jan 2008
Location: townsville australia
Posts: 74
Likes: 0
Received 0 Likes
on
0 Posts
i wouldnt have the faintest but when it did boost at 24 it would splutter, but seems 2 b happy at 15 psi goes like a champion have the start duties set at +2% in all gears and it just wants to go yeah baby
#12
Moderator
iTrader: (7)
If you get any detonation doing this your engine is toast, I hope you realize that.
I'm not saying 15psi is wrong if it turns out the fuel system on a 2000 turns out to be different than my 94, but I can say with certainty that it would be a very bad idea on a US Spec FD. I suggest you research this further or talk with a tuner who is familiar with the fuel system capabilities to be sure.
I'm not saying 15psi is wrong if it turns out the fuel system on a 2000 turns out to be different than my 94, but I can say with certainty that it would be a very bad idea on a US Spec FD. I suggest you research this further or talk with a tuner who is familiar with the fuel system capabilities to be sure.
#17
Full Member
Thread Starter
Join Date: Jan 2008
Location: townsville australia
Posts: 74
Likes: 0
Received 0 Likes
on
0 Posts
ru guys serious i drove my last car a1999 model series 8 for at least 7 months on 15 psi and it didnt miss a beat until it hit a few signs and fences. even this one will run just as hard to 9000 rpm, engine has done 90000 km.this car and my last are driven daily and i rack up over 300km per week so it gets a fair run
#19
Full Member
iTrader: (1)
Join Date: Jan 2003
Location: www.allhandsracing.com
Posts: 70
Likes: 0
Received 0 Likes
on
0 Posts
I drove my 94 on stock injectors running 14psi on stock twins with a stock ECU. Only thing added was a rising rate fuel pressure regulator. I ran 42 road course track days with the set-up and also drove it on the street. Never missed a beat. Not even once.
Only thing that killed the motor was when I overheated it at a race. I even did another two event's after overheating it. Didn't give any signs until months later, when it started using coolant.
The idea that you need an aftermarket ECU to run up to 14psi, is highly over sold.
This is not just my opinion it is also my experience.
Only thing that killed the motor was when I overheated it at a race. I even did another two event's after overheating it. Didn't give any signs until months later, when it started using coolant.
The idea that you need an aftermarket ECU to run up to 14psi, is highly over sold.
This is not just my opinion it is also my experience.
#21
Moderator
iTrader: (7)
I drove my 94 on stock injectors running 14psi on stock twins with a stock ECU. Only thing added was a rising rate fuel pressure regulator. I ran 42 road course track days with the set-up and also drove it on the street. Never missed a beat. Not even once.
Only thing that killed the motor was when I overheated it at a race. I even did another two event's after overheating it. Didn't give any signs until months later, when it started using coolant.
The idea that you need an aftermarket ECU to run up to 14psi, is highly over sold.
This is not just my opinion it is also my experience.
Only thing that killed the motor was when I overheated it at a race. I even did another two event's after overheating it. Didn't give any signs until months later, when it started using coolant.
The idea that you need an aftermarket ECU to run up to 14psi, is highly over sold.
This is not just my opinion it is also my experience.
Dave
#22
rotorhead
iTrader: (3)
Don't let the terminology confuse you. A traditional FPR, like the factory one and your typical Aeromotive one, maintain the same pressure differential between the fuel and the manifold. So at 0psi boost you may have fuel pressure of 36psi. At 10psi boost you will have fuel pressure of 46psi. The fuel pressure increases at the same rate as the manifold pressure. This can be called a 1:1 FPR, although people sometimes mistakenly refer to it as "rising rate."
On a "real" rising rate fuel pressure regulator, the oldschool kind, the fuel pressure increases faster than the manifold pressure. So at 0psi you may have 36psi fuel pressure. At 10psi boost, instead of having 46psi fuel pressure you might have 50psi. I refer to this as an "oldschool" mod because back in the day when engine management was more limited people had to do it this way rather than having a computer to calibrate.
The fuel cut varies with rpm. Here is the graph for the series 6:
The ceiling could be higher on the later models. Do the '99+ models run higher boost from the factory?
On a "real" rising rate fuel pressure regulator, the oldschool kind, the fuel pressure increases faster than the manifold pressure. So at 0psi you may have 36psi fuel pressure. At 10psi boost, instead of having 46psi fuel pressure you might have 50psi. I refer to this as an "oldschool" mod because back in the day when engine management was more limited people had to do it this way rather than having a computer to calibrate.
The fuel cut varies with rpm. Here is the graph for the series 6:
The ceiling could be higher on the later models. Do the '99+ models run higher boost from the factory?
#24
rotorhead
iTrader: (3)
here's info on a "real" rising rate fuel pressure regulator, courtesy of a wise old sage by the name of Google.com http://www.cartech.net/fmu2020instruc.htm