Date: Fri, 2 Apr 2004 09:20:41 +0100
From: MeatballTurbo <>
Subject: Intercooler heatsoak, and peak boost lower.......

Well, after being stuck in traffic for 15mins, and the rad fan kicking in, then getting free onto a nice dual carriageway, I noticed the boost gauge isn't boosting quite so high as it was 2 weeks ago. Now for those not in the UK, we have had a particularly mild last couple of weeks with temps far higher than normal. This morning, same dual carriageway, nice normal engine temps with the needle in the lower third of green (never normally goes much above that), I noticed that the boost is still not peaking quite so high, and dropping back slightly more (nowhere near baseboost level though). I'm guessing that the warmer less dense air is causing the APC and knock sensor to back off the boost with the warmer less dense charge going in. Now I don't have the money or time to perfect a decent water injection system, and I'm already running Shell Optimax (cheapest super locally ATM), so I'm guessing if it still knocking (or getting backed off pre- knocking) I need to cool the intercooler/inlet charge. I'm considering an intercooler fan on my original side mounted all alloy IC (can't really go the FMIC route on a flat front without some butchery). Has anyone done this? Was thinking something small like a Fiat 127 Rad fan (puller fan if possible to avoid dismantiling the original IC to fit it. Was thinking basing the operation on either a VAC/Boost switch, or on temp sensor in the inlet pipe, post IC, so it will trigger if the temps get above a certain level as they exit the IC. Apart from a cone filter, and alloy recirc valves and replaced vac hoses, the engine is pretty much standard, haven't tweaked the APC yet, and if I'm losing boost in spring temps, I hate to think what will happen mid summer on the few scorching days we get in the UK. Any experience anyone? -- The poster formerly known as Skodapilot.

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