Not sure where to post this, quite a few pre-compressor injection topics lately...
Well, I was happy last night on the first few runs with the pre-compressor injection.
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Originally Posted by PuntoRex
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Anyway, it works!
Lukily I didn't experience the WOT bog down as Gelf. Yet not so lucky as Hodrod to get a rise in boost. Car just pulls harder on boost, especially in the midrange. The performance gain is easily sensible with a quiter turbo hiss.
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Today on my way to work & the short business trip, I noticed some fluctuation on WOT & the process from WOT to gradually lift-off. And the car felt softer, not so powerful & energetic as last night. ( the sparkle is fading so soon? No! )
The fluctuation on WOT was slight, feel like ripples. When lifting-off, some time it became waves. Funny that it's not every time. Maybe 50/50 in my impressions. And sometimes the engine felt harsh along with the fluctuation.
When it happened on WOT, the boost came up normally.
I'm running 0.5mm pre-compressor & 0.6 pre-throttle without check valves currently. When I pulled over & checked the engine bay, I noticed the water lines were almost empty between HSV & jets. Only some fine droplets on the inner wall randomly, water here was siphoned out almost completely.
This might cause some delay on supply, but I didn't notice any det on the sharp throttle action & fast rising boost, so the cooling effect should be sufficient & in time, I guess. (injection starting @10psi with IDC of about 40% and up, max boost 20 with 70~80% IDC in high rev range ).
The fluctuation was in the sustained high boost situation. On the wave-like fluctuation when slowly lifting off, the boost was still higher then 10psi. Under that, everything returned normal & smooth.
Some different conditions between last night & today are:
1. Ambient temp. High teens to low 20-ish 'C last night. High 20-ish to even 30 'C today (higher around noon)
2. Loading. Me only last night vs me plus a passenger today. ( my colleague is not very big though, maybe 70-ish kg I guess ) Please note that this is a tiny car. I can always feel the performance impact caused by passenger(s). And A/C off last night vs A/C on today.
3. Driving style. Hard-on-the-throttle/rev-to-the-red style last night vs much more calm & gentle style today. I just couldn't enjoy myself when there's any passenger. My colleague was amazed when I pushed it on the highway, while I was somewhat disappointed & frustrated.
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Any thoughts?