How do you run 24.5psi on 91 oct???
Feb 26, 2008, 11:53 PM
#16
Bryan I had seen that thread and I decided that I am going to go back to ECU based boost control. I havent had very good luck with the factory BCS and the Green, the Hallman I am using now was touchy till I rebuilt it, but that boost curve is exactly what I would like to be able to do.
Feb 27, 2008, 12:06 AM
#18
Well I am not really spiking to 29 so much as the turbo isnt keeping up because of VE. I would much rather just being holding 29 all the way to redline though. I am going to put my log up ( I dont like doing it because its not the complete one) for the time being until I get one tomorrow of the car as it is today. My last logging session I had inadvertently unselected save to file as I was just watching roll in knock counts on my knock gauge previous to a full pull.
I have decided the Mr. Shead is correct in his assessment though. Airflow beats timing everytime....well until the turbo is out of its efficiency range anyway.
JB
I have decided the Mr. Shead is correct in his assessment though. Airflow beats timing everytime....well until the turbo is out of its efficiency range anyway.
JB
Last edited by JohnBradley; Feb 27, 2008 at 12:10 AM.
Feb 27, 2008, 12:12 AM
#20
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well I know I am mr. little irrelevant, however,
with a TBE,MBC, fuelpump, and a Tune on Chevron 91 I am spiking 24-25 and holding 21 on 03 VIII.
Timing IIRC is about 6-7* at spike and coming up to I believe 12*.
sporadic 1 counts, and usually the tuner didnt see any at all.
The only bad thing was I was at 91% IDC at WOT (stock injectors of course).
with a TBE,MBC, fuelpump, and a Tune on Chevron 91 I am spiking 24-25 and holding 21 on 03 VIII.
Timing IIRC is about 6-7* at spike and coming up to I believe 12*.
sporadic 1 counts, and usually the tuner didnt see any at all.
The only bad thing was I was at 91% IDC at WOT (stock injectors of course).
Feb 27, 2008, 12:25 AM
#24
That was the incomplete log. Thats why I said I didnt really wanna post it up since it doesnt really prove my case. I will be going out and getting an actual documented log tomorrow and this time I will leave save log to file checked. 
Well I am not really spiking to 29 so much as the turbo isnt keeping up because of VE. I would much rather just being holding 29 all the way to redline though. I am going to put my log up ( I dont like doing it because its not the complete one) for the time being until I get one tomorrow of the car as it is today. My last logging session I had inadvertently unselected save to file as I was just watching roll in knock counts on my knock gauge previous to a full pull.
I have decided the Mr. Shead is correct in his assessment though. Airflow beats timing everytime....well until the turbo is out of its efficiency range anyway.
JB
I have decided the Mr. Shead is correct in his assessment though. Airflow beats timing everytime....well until the turbo is out of its efficiency range anyway.
JB
Originally Posted by JohnBradley
Best with 28.9 tapering to 25 and timing going from 0* to 9* was 405whp. I dont have an EGT probe, but there was also no knock. I have one log from testing running that level of boost but there was some knock but not till it tapered to almost 23 (that was just a simple miscalculation).
Last edited by JohnBradley; Feb 27, 2008 at 12:44 AM.
Feb 27, 2008, 12:37 AM
#25
Evolving Member
Recently I have done some extensive logging and research regarding my car and the boost levels and timing it can run. I started with ecubased boost control (Twin solenoid) and after that went to HKS EVC 6. Here are my findings for my car on 91 octane:
Please keep in mind that these findings are for my car only. (with JDM RS mivec)
1) Using ECUbased boost control, the car could spike to 24psi and hold 19.5 to 7K without any knock. Timing was 2-3 going up to 13-14. This was not possible with ebc.
2) I never knocked during the 3-3.5k range.
3) I could run with 23 psi at 3300rpm tapering to 22 at 6k to 21 psi till 7k without knock. Timing around 3-4 at peak boost to 13-14 at redline. But I found this boost level to be a bit volatile because I would do 3 back to back pulls with 0 knock but then suddenly I would see 6 counts out of no where. So I thought that timing might not be the factor here. So I reduced boost by 0.5 psi across the board and voila! no more knock on multiple back to back pulls.
So, right now with my minimal mods, very poor octane I am running 22.5 psi to 20.5 till redline.
Please keep in mind that these findings are for my car only. (with JDM RS mivec)
1) Using ECUbased boost control, the car could spike to 24psi and hold 19.5 to 7K without any knock. Timing was 2-3 going up to 13-14. This was not possible with ebc.
2) I never knocked during the 3-3.5k range.
3) I could run with 23 psi at 3300rpm tapering to 22 at 6k to 21 psi till 7k without knock. Timing around 3-4 at peak boost to 13-14 at redline. But I found this boost level to be a bit volatile because I would do 3 back to back pulls with 0 knock but then suddenly I would see 6 counts out of no where. So I thought that timing might not be the factor here. So I reduced boost by 0.5 psi across the board and voila! no more knock on multiple back to back pulls.
So, right now with my minimal mods, very poor octane I am running 22.5 psi to 20.5 till redline.
Feb 27, 2008, 03:53 AM
#29
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You might be interested in this post (which references the 1st post in the same thread):
https://www.evolutionm.net/forums/sh...88&postcount=6
https://www.evolutionm.net/forums/sh...88&postcount=6
Woah, so what that is telling me is that the 3-port, when tuned correctly, will hold boost better and have more at the top end than an MBC?
(Sorry, I have been out of the 3-port thing for awhile, but this might make me jump back in head first..)
