interesting

 

very interesting...

 

Awesome numbers man! Ivey is the m*tha F****** man! lol I wish that I could have just waited a few more months to get the Red instead of the Green. Well atleast I kept my stock IX Turbo so I can just send it in for an upgrade...

 

Creep doesn't work that way ... it's a physical limit, and absolute minimum if you will. So, if you set boost to 18 psi and it creeps to 25, then setting it at 23 psi should still only let it creep to 25 as the WG will still do all it can to lower the boost level and essentially end up at the same minimum level.

Unless my understanding of the cause and effect of creep is incorrect ...

 

There's nothing that can affect boost creap between the 93 oct setup and the 100oct setups other than the target boost.

Try running the same boost on 100oct as on 93oct and you should see the same boost creap. Accordingly, running more boost on the 93oct tune should solve the creap issue... I could be wrong, but it's worth a try imo.


Nice numbers, and good luck with your car

 

^^^ +1


my Green with the FP HD WGA used to creep like that on pump gas - it would slowly creep from 22psi to 25.5psi on pump, which I didn't feel comfortable about. However, when we switched over to the stock IX WGA, the standard Evo torque spike came back and the creep lessened.


Now I run pump+meth for higher boost and don't get any creep.

 

Im gonna give that a try tonite raise the boost to 23-24 and see if it still creeps past 25-26psi. I do miss that initial torque spike the stock IX turbo had. The Red atleast on my car is more of a gradual climb in torque. Still pulls great in upper rpms either way and holds to 8k.

 

Great Numbers man. I'm going to try and mimick your numbers with my setup. I just ordered my Red today. The only real difference is that I'm trying this with 93+meth which I'm assuming is comparable to 100octane. I saw that you maxed out on the 780's so I went with 950's. This will be my third tune from Sean. Great guy and great tuner.

 

^^^^ Good Luck with it man your def gonna love the turbo and spool. 950's def a good call i ordered my injectors from Buschur and they talked me out of anything above 780's on stock ecu. I now regret that b/c i now have to get bigger ones, when i should have just got the 880's or 1000's that i intended on. Sean said he has no problem tuning on 1000cc stock ecu.

 

So i set it to 24psi and now it creeps to 27-28psi by 5k rpms. The intilial torque spike is back but its still creeping. I'm afraid to go to high on 93oct. so i'm gonna lower it back down to avoid any issues.

I have talked to a few others with the same problem on "93oct pump gas boost levels 22-25psi". We came to the conclusion that on the 10.5 Hot Side the wastegate hole and flapper are not large to let out enough exhaust to keep boost steady. This is the only reason it is creeping. I'm not gonna put the stock actuator on b/c that will hinder performance on 100oct. Its not the 02 dump(gasket matched) if anything that would help reduce boost creep. If anyone else wants to chime in i'm open for ideas!!!

 

That is really odd man ... have you tried a stock actuator yet? I don't see how it would really affect the unusual response you're getting (upping boost = more creep), but it's worth a shot.

I know that this is an overly asked question, but have you done a boost leak test? It could be an odd occurrence where there is a leak that really shows itself at low RPM but as VE increases the turbine overcomes it and causes the boost to spike. I know it's a long shot, but maybe worth considering.

I agree that the stock WG can't flow enough to completely eliminate creep, but yours is a bit high and responding unlike most creep I've seen.

 

Have you checked the preload on the actuator? You may have way too much.

 

if you set boost to 18 psi and it creeps to 25, then setting it at 23 psi should still only let it creep to 25....[/quote]
Following your line of reasoning, Bubble, if peak boost were raised to 25#, then the boost would not creep beyond 25, huh?

 

nice numbers.

 

Yes, that's correct. My understanding is that boost creep is *usually* caused by a physical limitation. The limitation wouldn't change with increased boost. Boost is controlled by regulating pressure to the WGA and is a self-regulating system once set (in the case of a MBC/standard EBC).

If the creep level rises w/ increased boost then I'd lean toward an issue directly related to the boost control system ... the WGA specifically. Too much preload could cause the issues mentioned as it would limit the ability the regulate lower pressures.

I had to tune a car with a bad creep issue once ... the issue was restriction in the O2 housing. Boost was set to 24 psi and crept to 27 psi at around 5500. To test, we sent direct manifold pressure to the WGA (11.5 psi) and it crept the the exact same level ... 27 psi.