Tune for boost creep?

[pickens]

Ever since I put my RNR downpipe on, my poor little small 16g can't pass enough gas through its wastegate hole. I currently can not run lower than 20-21psi. Needless to say, on my stock smic and crap 91 pump gas, I cannot go wot w/ out serious knock issues. Instead of trying to reduce the creep as so many do, I plan on letting the turbo put out what it wants while I add some mods to support the boost level. I'm planning on getting a fmic REAL soon, but do you think this would reduce my knock issues at 20-21psi on my 16g using 91 pump, or will the car still be untunable. I mean, I can always through gobs of fuel in to combat knock, but thats not the way I prefer to do it.

Mods:

small 16g
SAFC2
RC550
Full turboback exhaust

 

[kpt4321]

Fuel won't necessarily get rid of the knock by itself.

Don't ignore the problem and tune around it. If you don't want the boost that high, don't let it creep.

A FMIC and the proper sized fuel injectors should allow you to tune fine at 20 psi.

 

[boostedinaz]

You have to get rid of the creep to get a good tune. What happens when you are tuned for 20 psi and it only creeps to 16. then your tune is off and you have to do it again. I had the same problem when I put big exhaust on my car. I got beat pretty bad by my friends Mustang even messign with the tune a bit. When i cured the creep and had it set right I pulled him fairly well. Fix problems then mod. Repeat if necesary.

Michael

 

[pickens]

Don't miss the point here. I want to be able to run the turbo at what it wants to put out. I don't want to have to throw a lot of fuel at it either. However, I am really wondering if this 91 pump will allow for the boost, even when a fmic or WI is in the equation.

 

[boostedinaz]

Don't miss the point here. I want to be able to run the turbo at what it wants to put out. I don't want to have to throw a lot of fuel at it either. However, I am really wondering if this 91 pump will allow for the boost, even when a fmic or WI is in the equation.

The turbo puts out what you tell it to put out. If you want to thrrow a bunch of things at instead of fixing the problem then go ahead. WI and a FMIC will help, but not alot. i dont understand the fixation with just letting it creep. If you fix it and then set it up to run 20 lbs all the time you will be better off then trying to work around creep.

Michael

 

[kpt4321]

If you fix it and then set it up to run 20 lbs all the time you will be better off then trying to work around creep.

EXACTLY!

Pickens, I already told you what the sitution would be with a good FMIC and proper tuning. I already told you that you could run 20 psi like that. What more do you want to hear?

Like Mike said, fix the creep, set the boost where you want it, and then tune.

 

[saxrulez]

pull the turbo housing and o2 housing.

Port.

Be happy

I just did it

My little 14b INSISTED on going to 17-18 psi on 3rd gear no matter what....and thats during the hot weather! Cold weather and it wanted to do 20-21.

Turned it down to 13psi just to watch it, solid as a rock now.

 

[DJ23GSX]

Ok your boost creeps up to 20-21psi right? At what rpms do you hit that? My guess is in the higher rpms just like my old talon around 5-6k rpms. Fix the creep problem then set your boost control to 20psi. I fixed my creep and set the controller at 20psi and i was hitting that boost setting by 3500rpms and believe me it pulled a ton more than it did when i just let the boost creep up to 20psi. It was well worth the effort to eliminate the creep. I used a MKIV Supra sidemount i/c and it made a huge difference in knock counts so a front mount should definatly help but not really fix your problem. I use 94 octane gas also. I know its not the answer you were looking for but its probly your best option.