Boost Precaution
#11
I already have a power fc... have not installed it yet but i have it... I was planning on running the engine in with the old ecu and then putting in the Power FC... What do you guys suggest?
I think my Power Fc came pretuned to 12 psi
thanks
I think my Power Fc came pretuned to 12 psi
thanks
#12
If you mean the stock ECU when you say "the old ECU", that would not be a good idea, especially with all the mods you have.
Your PFC is going to have to "learn" a lot of stuff when you install it, so you might as well put it in now. Problem is, you need to have it tuned correctly; don't just think that just because it is "tuned for 12 psi" that you can just run it up without any problems, even while breaking in a motor. Every motor is different, so one person's map won't necessarily work for another. The extreme tuning capability is one of the great things about the PFC, but it's also one of its great disadvantages for those who don't know how to work with it.
Your PFC is going to have to "learn" a lot of stuff when you install it, so you might as well put it in now. Problem is, you need to have it tuned correctly; don't just think that just because it is "tuned for 12 psi" that you can just run it up without any problems, even while breaking in a motor. Every motor is different, so one person's map won't necessarily work for another. The extreme tuning capability is one of the great things about the PFC, but it's also one of its great disadvantages for those who don't know how to work with it.
#13
I am very new to the PFC... I have no idea how to tune it... New good tuners around... What should i do?
Should i run the engine in with the original PFC settings keeping the revs under 4500...
Any suggestions
Thanks
Should i run the engine in with the original PFC settings keeping the revs under 4500...
Any suggestions
Thanks
#15
Originally Posted by RX73rdgen' date='Oct 24 2003, 09:02 PM
Well you don't port your wastegate to make exhaust flow more efficient. You port your wastegate because you've increased the airflow to the turbo so much that the stock size wastegate can't bypass air around the turbo fast enough to keep boost under control. This is called boost creep. As rpms rise your boost pressure will continue to rise even higher than you want it to because the wastegate can't keep up. It will usually happen on a stock motor if you remove the all the cats and get a high flow muffler. A ported motor would probably make it even worse.
That is a good point. I hadn't thought about the possibility of boost creep occurring on the turbine side of the turbo. I do know that I am running a stock turbo system with a ported engine; down pipe and cat back exhaust. I have not had any problem with this setup yet. However, I do still have the stock main cat. Perhaps this is saving me.
Still doesn’t sound like a good idea to me somehow though. If you did it wrong, couldn’t you destroy your turbine housing. Also, wouldn’t the wastegate be leaking all the time? I would really want to be absolutely sure that this was necessary before attempting it.
I apologize if I misinformed you Rotorfreak. Anyway, if you can, I would say the best people to ask would be the guys porting the motor. They will have the best idea as to what effects their port job will have on the characteristics of the engine.
#16
I spoke to my guy in japan who is supplying the engine... One thing he said he is using some new kind of 1 piece seals... which are even better than the 99 spec engine...
Also regarding the engine break in... he recommended i run it in below 5000rpms for 5000 kms !!!!!!!!!!!!!!! isn't that a bit too much??? I mean i drive my car that much in 10 months maybe....
Please advise what to do
Thanks
Also regarding the engine break in... he recommended i run it in below 5000rpms for 5000 kms !!!!!!!!!!!!!!! isn't that a bit too much??? I mean i drive my car that much in 10 months maybe....
Please advise what to do
Thanks
#17
ok you know about porting the wastegate you need to do that when your engine and mods are very free flowing so you dont boost too much
-even when i set my car to 7psi on a ported engine and full exhaust it would go to 11psi by 7800rpms
you have a high flow cat so it may not be as bad
as far as new seals and stuff I'd stick with traditional stuff
and for breakin if the engine has all new bearings and new housings and rotors I'd do a couple thousand miles maybe 3000. If that stuff was reused then maybe 1500 miles just drive real easy. You have to do it gradual. Like the first day dont go above 2,500 rpms and don't boost. Then after 500 miles go to 3000rpms and boost to 2-3 psi keep continuing like that just slowly let it get used to revs and boost. You can't let the car bog though don't let it get under 2100rpms while cruising and change the oil every 500 miles.
this might be overkill but it's what I'd do if I spent a hardcore amount on an engine and didn't want to do this engine thing again
SNook
-even when i set my car to 7psi on a ported engine and full exhaust it would go to 11psi by 7800rpms
you have a high flow cat so it may not be as bad
as far as new seals and stuff I'd stick with traditional stuff
and for breakin if the engine has all new bearings and new housings and rotors I'd do a couple thousand miles maybe 3000. If that stuff was reused then maybe 1500 miles just drive real easy. You have to do it gradual. Like the first day dont go above 2,500 rpms and don't boost. Then after 500 miles go to 3000rpms and boost to 2-3 psi keep continuing like that just slowly let it get used to revs and boost. You can't let the car bog though don't let it get under 2100rpms while cruising and change the oil every 500 miles.
this might be overkill but it's what I'd do if I spent a hardcore amount on an engine and didn't want to do this engine thing again
SNook
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