1.6bar IS 23psi

 

I know what IT is...

You mentioned running 21lbs on 93...

 

Nope, I didn't. I said the stock turbo usually tapers to 21-22psi by redline,which is usually regardless how much higher you set the peak boost.








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Let me clarify...

You said the most you usually see people run safely is 23psi on 93 octane...

This makes me think that you think 23psi on 91 octane is NOT safe?? (I assumed)

Sorry for the confusion...

 

I only stated 93 because that he was tuned with. 23psi is possible with 91 but with less aggressive timing usually.

 

There's no way it can be running on pump gas alone, with meth or race gas maybe but it's pretty pointless to go that high due to (A) your timing is probably pulled to all hell, and (B) your compressor is so far out of it's efficiency range at that pressure that it's blowing nothing but forced heat. Honestly if you're on pump you should turn it down quite a bit. I've pulled roughly 24psi out of my stock 8 turbo on 93 pump before but the loss of timing made no difference when compared to a lower safer number with more of an advance to the timing.


To evo_man_06...love the sig btw, being a former Honda owner and I can say it's completely true lol.

 

I check for knock and there is no knock when it hits 28 and also in the entired pull at the dyno. Probably the drop of boost is also the internal waste gate. The afr is fine even dough it hits 28psi. I also check the afr in the streets and its running 11.5 almost all the way. I own an evo 8 but the one that is mention is an evo9 mr. Also I forgot to metion that has the pipping for the intercooler and a big intercooler 4". I tried to reset the numbers of the mivec but no good results. The most horsepower I could get was from the timing. Believe me that is more than safe when it hits 28psi at 6,000rpms. The first pull of this day was 328hp. We went to the tracks with 328 hp and made 12.5 at 108mph. Not a good pass at the tracks but it was ok for my first time. The horse power curve looks nice.
I will post the sheet as soon I scanned it. thanks for all your comments.

 

28psi at 6K??????????????????????? How is that even possible with the stock turbo???

 

There is no way it is holding 28psi with a manual boost controller. EBC, maybe but still unlikely.

With the ECU controlled boost and pill, I would spike 28psi and it would taper down to 21/22 at redline (7k). It held 28 psi for all of 500-700 rpm tops.

 

Agreed. Posting the spike is kind of deceiving, it would be better to say that your pressure spikes at "x" psi at such and such rpm and drops to a steady "y" psi by "this" rpm to redline.

 

id check your knock sensor and see if the damn thing still works

 

well let me clarify, looking at the chart....the 28psi goes at 4,200 rpm and at 5,000rpm the boost drops to 25psi....i forgot to mention that the car has a forge adjustable waste gate actuator ...... I'm not using the stock celenoid... the car has profet b boost controler.....

 

Not at his elevation.

1.6 bar @ 6300 feet = 20.56 PSI.

 

+1

Although cheap mechanical pressure guages, which measure differential, will still read higher because they don't compensate for lower ambient pressure.

To the more general audience: You really have to look at absolute pressure. At 7000' I run 24psi of boost. At sealevel, that same amount of pressure would only be 21 psi above ambient.

d

 

that quite a bit boost for pump gas. I would lower the boost to around 23ish, add more timing. Post up a log, lets see your timing/afr's. Maybe we can help you make more power. Turnin up the boost doesnt always mean more power.