[e.n335]

I currently make my own experience with quite some datalogging involved, everything looks fine ( using 95 octane AKI / 100 octane RON gas ) and the car runs great . I'm curious what you think about boosting 16 PSI in terms of reliability. Please keep in mind that our turbos are used in the Alpina B3 TT with 16 PSI max by their ´stock´ tune.

I quote scalbert from another thread:

Originally Posted by scalbert

I find some irony in this. The fact that 16+ PSI is run, with supporting modifications of course, is now commonly accepted. And I do firmly beleive that GIAC tested this well and know what they are doing. However, I do recall a recent time when one tuner said that 14.5 PSI was the most the turbos could handle and this was from "extensive testing of compressor speeds" (BS if you ask me). But that was due to limitation of hardware and now that the issue has been over come, it is fine to run higher.

Anyway, again, that looks good and a testament to GIAC's knowledge on tuning turbo vehicles.

The GIAC stage 2 flash provides 16 PSI as well and I have seen quite some PROcede datalogs recently with such boost pressure numbers. I expect an upgraded FMIC is highly recommended although Alpina uses the stock one.

[cronus]

The B3 has 9.4:1 compression ratio. Stock is 10.2:1.

I like my warranty...

[enrita]

i have been boosting at those levels for quite sometime without any issues. Frequent oil changes and spark plugs with the right mods should help the car cope with that.
Get an FMIC though, really important at those boost levels .

[MFKN3]

95 oct should be fine

[cn555ic]

Originally Posted by enrita

i have been boosting at those levels for quite sometime without any issues. Frequent oil changes and spark plugs with the right mods should help the car cope with that.
Get an FMIC though, really important at those boost levels .

+1 proper maintenance and supporting mods will help running those psi...

[e.n335]

I use an FMIC, Forge DV's, VKM oilcooler, High-Flow metallic primary catalysts and a drop-in filter.

Came back from datalogging right now, did a couple of WOT pulls 3rd and 4th gear. Everything works great and the car is really fast.

[scalbert]

If everything is set up to support it and the logs do not show knock, you should be fine.

[e.n335]

Originally Posted by scalbert

If everything is set up to support it and the logs do not show knock, you should be fine.

Isn't it normal that the BT-logs show some knock counts very rare ? Mine do, mostly in low rpm range and on 25% - 50% trottle position. I thought this is part of the continuous ECU adaption. Timing is not pulled on these occations. ECU is error-free.

[scalbert]

Originally Posted by e.n335

Isn't it normal that the BT-logs show some knock counts very rare ? Mine do, mostly in low rpm range and not on 25% - 50% position.

The Knock Status isn't very reliable. But looking at the ignition timing curve can show evidence under load.

[e.n335]

Originally Posted by scalbert

The Knock Status isn't very reliable. But looking at the ignition timing curve can show evidence under load.

I edited my posting. Timing is not pulled, no audible knock signs, no misfiring codes, no super-knock codes. engine feels strong and healthy. All I'd have to do is to don't exceed 16 PSI in any environment, IMO.

[dmurray14]

My question is, turbos aside, what can the engine reliably handle? It seems the boost keeps getting higher and higher, I'm just curious whether anyone has any speculation or comments on what the engine itself is strong enough to handle?

[scalbert]

More than what we are currently seeingg and more than what our current fuel system can support.

[enrita]

Till we dont start seeing upgraded turbos running we wont know what the limit is but i would guess 500 whp.

[e.n335]

From a different thread:

Originally Posted by enrita

Thought i would post my logs with the GIAC stage 2 EU Beta 94 octane
Car runs like a dream and never had a limp or code so far after 2 months.
Car pushes really hard on top with incredible smooth and quick shifts and response:

This information is really great ! I could verify that my timing-curve looks quite similar. However, my current EVOtech variant (Daehler) flash and JB+ (flash version) on top of it provide more timing at comparable boost pressure levels and 100 octane RON gas. Should I reduce boost pressure a hair or is this ok ?

BTW - can we log AFR using the BT tool ?

[enrita]

Originally Posted by e.n335

From a different thread:



This information is really great ! I could verify that my timing-curve looks quite similar. However, my current EVOtech variant (Daehler) flash and JB+ (flash version) on top of it provide more timing at comparable boost pressure levels and 100 octane RON gas. Should I reduce boost pressure a hair or is this ok ?

BTW - can we log AFR using the BT tool ?

is fine as long as the car runs well and its not pulling timings or limping. the 95 RON gas probably does the trick :-). My Stage 2 still has room for more advanced timings but i need more octane .

[hotrod182]

Before switching over to 2.0, I did a run on JB3 map#7 1.4 so you can see the boost gauge in the lower right hand corner. For the most part, boost is 14psi or lower.

Still got 0-60 in 3.8 sec
Soft 2nd gear launch.
1/4 mile: 12.0 sec over 120mph trap.
It really doesn't take crazy boost levels to get some pretty good power.
This was Map 7 on 91octane/meth.

[E92murdered]

how long do you change your oil? intervals of 7500?

Originally Posted by hotrod182

Before switching over to 2.0, I did a run on JB3 map#7 1.4 so you can see the boost gauge in the lower right hand corner. For the most part, boost is 14psi or lower.

Still got 0-60 in 3.8 sec
Soft 2nd gear launch.
1/4 mile: 12.0 sec over 120mph trap.
It really doesn't take crazy boost levels to get some pretty good power.
This was Map 7 on 91octane/meth.

[e.n335]

I change oil every 6500 miles. If I would race, I would change oil more often.

[hotrod182]

Originally Posted by bmwowner619

how long do you change your oil? intervals of 7500?

I do mine about every 10,000 miles, which happens to be how often the car oil service reminder comes on.