Help!, Boost Spike!...
#1
- Make Haste -
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Help!, Boost Spike!...
As the name says, i have a question, my mods are as listed:
- 3" Racing Beat Turbo-Back Exhaust
- Blitz SS BOV
- Tein Coilovers and springs
- Centerforce Dual-Friction clutch
- HKS PFC F-Con
- HKS GCC
- HKS Turbo-Timer
- FCD
- SRP Boost controller
- Autometer boost and A/F guages
- MazdaSpeed steering wheel
- MazdaSpeed racing pedels
- Manaray 6spoke 16" rims
- Yokohama Z-Rated rubber
When i floor it in 4th and 5th and boost is made it spikes at 15psi then goes back too 10psi, other gears it goes from 13psi spike too 10psi, i was wondering, i have a manual boost controller and want to install it, what do you guys think, i am buying a walbro 255lph fuel pump soon aswell but wanted your guys' opinions, can i put the boost controller in and somewhat help this situation of mine and level boost at 11-12psi or wait for the fuel pump, how could i control the ammount of fuel going in if i get the pump?...
anyways, thanx in advance, there was other things i would like to ask but not right now, i cant remember some....
Oh, when should i upgrade the fuel system, i have a good hunch RIGHT AWAY, i watched my A/F guage and all seams normal throughout the power band so i'm confused, even with the 15psi spike, help!...
- 3" Racing Beat Turbo-Back Exhaust
- Blitz SS BOV
- Tein Coilovers and springs
- Centerforce Dual-Friction clutch
- HKS PFC F-Con
- HKS GCC
- HKS Turbo-Timer
- FCD
- SRP Boost controller
- Autometer boost and A/F guages
- MazdaSpeed steering wheel
- MazdaSpeed racing pedels
- Manaray 6spoke 16" rims
- Yokohama Z-Rated rubber
When i floor it in 4th and 5th and boost is made it spikes at 15psi then goes back too 10psi, other gears it goes from 13psi spike too 10psi, i was wondering, i have a manual boost controller and want to install it, what do you guys think, i am buying a walbro 255lph fuel pump soon aswell but wanted your guys' opinions, can i put the boost controller in and somewhat help this situation of mine and level boost at 11-12psi or wait for the fuel pump, how could i control the ammount of fuel going in if i get the pump?...
anyways, thanx in advance, there was other things i would like to ask but not right now, i cant remember some....
Oh, when should i upgrade the fuel system, i have a good hunch RIGHT AWAY, i watched my A/F guage and all seams normal throughout the power band so i'm confused, even with the 15psi spike, help!...
Last edited by Archangels; 04-29-05 at 03:19 AM.
#3
- Make Haste -
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can i do anything in the mean time...?
i was going to send my whole turbo off too BNR when winter sets in....
plus is it anything to worry about if i do the fuel pump and boost controller?...
i was going to send my whole turbo off too BNR when winter sets in....
plus is it anything to worry about if i do the fuel pump and boost controller?...
#5
- Make Haste -
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very true, i was told a boost controller will help a little, but if it's nothing too too major to worry about i'll let BNR do the whole turbo later....
#7
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Originally Posted by Archangels
very true, i was told a boost controller will help a little, but if it's nothing too too major to worry about i'll let BNR do the whole turbo later....
If you're on stock injectors, that motor won't last long running 15 psi. Port the wastegate ASAP.
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#10
Nurse I need 1300cc's NOW
reguardless your turbo isnt gonna last. the stock turbo really isnt rated for past 10 psi for long periods of time. port your wastegate. i think it takes about 1.5 hours to pull the turbo . if you have put on a downpipe you might want to put the stock cat back on to help lower the boost being made untill you can sent your turbo out to BNR. BTW Brain will do a 30 mm port job with the plaining of the manifold for a extra 100 bucks during the rebuild.
#11
- Make Haste -
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hmm, i'll keep that in mind, if all else fails and the turbo goes i'll buy another, my friend said i could get a hybrid for around $500 canadian if i'm lucky....
i know the turbo wont last all that long, but it has low KM's on it and it's doing fine for now, no signs of wear, i just want to know that my engine will last.... turbo is second on the list....
i know the turbo wont last all that long, but it has low KM's on it and it's doing fine for now, no signs of wear, i just want to know that my engine will last.... turbo is second on the list....
#12
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Originally Posted by Archangels
i just want to know that my engine will last.... turbo is second on the list....
But, yeah, just incase you didn't read what the last 10 guys said, get the freaking wastegate ported.
#13
Rotary Enthusiast
You could be leaning out for some reason... Port the wastegate and get an egt gauge, if you are hitting close to 1400 you in deed are leaning out...
#14
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I have an ebc with no ported wastegate...I creep to 15 psi all the time mbc/ebc doesn't do crap unless the wastegate is ported. And to make sure I don't lean out when I get my bigger turbo I will put 720cc secondarys so I can run 15 psi when I race But yeah right now when it creeps to 15 psi I let off...don't want my turbo to pop yet
#15
I break Diff mounts
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Well the general idea(could be total BS) is that 10-12psi is the limits for safe psi on stock 550's.
I have myself hit 15psi on my car by accident and it did not detonate. I had a walbro and cleaned 550's in it with an Rtek 1.5.
I wouldn't be worried about the turbo. I'd be afraid of a $2k replacement engine.
I have myself hit 15psi on my car by accident and it did not detonate. I had a walbro and cleaned 550's in it with an Rtek 1.5.
I wouldn't be worried about the turbo. I'd be afraid of a $2k replacement engine.
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Originally Posted by slpin
guys................... boost SPIKE... not boost creep...............
Originally Posted by mazda se
Get the wastegate ported that should help
Originally Posted by Mx6-Rx7 Addict
Port the wastegate. As far as i know, that will be the only solution to your problems.
-Justin
-Justin
Originally Posted by tjeter
yeah, your best bet is to get your wastegate ported.
Originally Posted by jon88se
Port the wastegate ASAP.
Originally Posted by alwayssideways
...port your wastegate...
Originally Posted by bigdv519
But, yeah, just incase you didn't read what the last 10 guys said, get the freaking wastegate ported.
Originally Posted by SmogSUX
mbc/ebc doesn't do crap unless the wastegate is ported
Originally Posted by kd86rx7
either way he should port the wastegate, it would solve the boost problems.
Last edited by bigdv519; 05-02-05 at 11:31 PM.
#20
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*sigh*
except boost spike happens at the beginning of the boost
while creep happens in high gear, and goes up slowly
you do not even know the difference between them
the problem in his case... is most likely a leaking vacuum hose that goes into the wastegate
remember.... he has a 89... that brittle vacuum line has 16 years for it to crack and leak...
see.... this is seriously a pathetic forum.... with the exception of a few intelligent members, the rest are just followers, saying the same thing over and over again....
from people who thinks they know everything and couldnt even type... to well... people who just follow everyone else and say the same thing over and over....
how would porting the wastegate help when the wastegate isnt even opening at the beginning of the boost...
lets weight something out, ok? port the wastegate, drop exhaust, take turbo out, port it, REUSE his old compressor to wastegate vacuum line... STILL spike....
or just replace the vacuum line, and NOT have it spike....
go ahead... waste your time... be ignorant....
this place sucks... im going home
except boost spike happens at the beginning of the boost
while creep happens in high gear, and goes up slowly
you do not even know the difference between them
the problem in his case... is most likely a leaking vacuum hose that goes into the wastegate
remember.... he has a 89... that brittle vacuum line has 16 years for it to crack and leak...
see.... this is seriously a pathetic forum.... with the exception of a few intelligent members, the rest are just followers, saying the same thing over and over again....
from people who thinks they know everything and couldnt even type... to well... people who just follow everyone else and say the same thing over and over....
how would porting the wastegate help when the wastegate isnt even opening at the beginning of the boost...
lets weight something out, ok? port the wastegate, drop exhaust, take turbo out, port it, REUSE his old compressor to wastegate vacuum line... STILL spike....
or just replace the vacuum line, and NOT have it spike....
go ahead... waste your time... be ignorant....
this place sucks... im going home
Last edited by slpin; 05-02-05 at 11:42 PM.
#21
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Ahhhhh, dont leave us. Ok, ok, so when I pulled my turbo, I replaced all the wastegate lines, so no, I have never experienced boost spike. So the point goes to you. Whatever you do, please don't leave us though!!! JK, go home already, your correct about checking the lines first.
#22
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Originally Posted by slpin
*sigh*
except boost spike happens at the beginning of the boost
while creep happens in high gear, and goes up slowly
you do not even know the difference between them
the problem in his case... is most likely a leaking vacuum hose that goes into the wastegate
remember.... he has a 89... that brittle vacuum line has 16 years for it to crack and leak...
see.... this is seriously a pathetic forum.... with the exception of a few intelligent members, the rest are just followers, saying the same thing over and over again....
from people who thinks they know everything and couldnt even type... to well... people who just follow everyone else and say the same thing over and over....
how would porting the wastegate help when the wastegate isnt even opening at the beginning of the boost...
lets weight something out, ok? port the wastegate, drop exhaust, take turbo out, port it, REUSE his old compressor to wastegate vacuum line... STILL spike....
or just replace the vacuum line, and NOT have it spike....
go ahead... waste your time... be ignorant....
this place sucks... im going home
except boost spike happens at the beginning of the boost
while creep happens in high gear, and goes up slowly
you do not even know the difference between them
the problem in his case... is most likely a leaking vacuum hose that goes into the wastegate
remember.... he has a 89... that brittle vacuum line has 16 years for it to crack and leak...
see.... this is seriously a pathetic forum.... with the exception of a few intelligent members, the rest are just followers, saying the same thing over and over again....
from people who thinks they know everything and couldnt even type... to well... people who just follow everyone else and say the same thing over and over....
how would porting the wastegate help when the wastegate isnt even opening at the beginning of the boost...
lets weight something out, ok? port the wastegate, drop exhaust, take turbo out, port it, REUSE his old compressor to wastegate vacuum line... STILL spike....
or just replace the vacuum line, and NOT have it spike....
go ahead... waste your time... be ignorant....
this place sucks... im going home
So just check your vac lines.
#23
Haven't we ALL heard this
Make sure the line that goes to your WG is short as you can make it.
Also, you could try putting a restrictor pill inside the wastegate vac line.
I am trying to think what would cause spike. So, you floor it and it jumps to 15psi. then drops back to a controable 10psi.
That really sounds like a vacuum line problem. Make the line as short as possible. Also, take the line and run it staright from the compressor housing to the WG actuator and see what that does.
I would guess the reason it spikes is because your WG gets temporally over whelmed by the rapid exhaust flow. So, try that restrictor pill.
James
Also, you could try putting a restrictor pill inside the wastegate vac line.
I am trying to think what would cause spike. So, you floor it and it jumps to 15psi. then drops back to a controable 10psi.
That really sounds like a vacuum line problem. Make the line as short as possible. Also, take the line and run it staright from the compressor housing to the WG actuator and see what that does.
I would guess the reason it spikes is because your WG gets temporally over whelmed by the rapid exhaust flow. So, try that restrictor pill.
James
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