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Mates LCR produces constant 1.6 bar
and the same code as mine in another LCR reaches 1.5.
Don't think its a K04 thing, just my K04.
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Constant 1.6 bar?
Where?
1.6 bar at the red line?
I just can't see that...
Or do you mean it constantly produces 1.6 bar peak...each time?
The K04 can make big peak boost, but simply cannot produce big boost further up the rev range...the compressor is simply too small. Even if you rag the turbo to death, using re-maps, N75s, boost machines etc you still strugle to maintain 1.2+ bar at the top of the rev range.
Certainly on standard ICs you can't run it there...the turbo gets so damn hot, the inlet charge temperature goes through the roof and the ECU ******* the timing to protect the engine - making the engine loose performance. Not ideal.
With modified turbo pipework, 2 x efficient ICs (including a FMIC), Samco Hoses, aggressive re-map and N75 you will struggle to get more than 1.2 to 1.3 bar held to peak power - and the K04 is absolutely flat out at that - way outside it's afficiency range.
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Anyone think I should try a different N75 ?
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Without logging EGTs, Inlet charge temps, IC efficiency, Timing, AF ratio etc...no I don't think you should try it.
But, log all the pertinent parameters on a decent rolling road and convince yourself it's not going to damage the engine, and prove that you are getting a gain...fine, by all means try a different N75.
But, you still may not be able to run an alternative N75 out on the road...it all depends on whether the limp mode activation point has been raised, or not.
If it hasn't - or hasn't been raised enough - you hit limp mode out on the road.
Changing the N75 on a re-mapped engine is not the best idea unless you are aware of what it's doing, and if your engine is able to cope. Just be wary.
