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Registered:
June 2003
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Hmm, upgrades.
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Fri, 16 July 2004 16:07
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Well for anyone that cares I just thought I'd post a little more progress on my baby. For those unfamiliar it's an MA61 with a 7MGTE in it. Had it inspected on the dyno the other day, and found it was leaning out a fair bit (13.1 at one stage). A few tests later and we found the fuel pressure was down by about 10 psi. Well, time for a new fuel pump!
In goes the little walbro 700HP number.
A few more tests, and now the fuel pressure is about 30 psi too high! Tracked the high psi problem down to the stock fuel flow regulator. Poor little thing just wasn't up to the task of 255 litres/hour - was proving to be a bit of a restriction, hence the fuel pressure increase.
In goes the adjustable fuel flow regulator.
Now all seems peachy at 38psi fuel pressure. Back on the dyno, and the afr's are sitting pretty on 11.5. A little richer than I'd like it, but much closer to what Mr Toyota ordered from the factory.
Now the head has been off my 7M, I know that much. As for what black magic was been waved under there I do not know - except that there's a non-standard gasget in there, different head bolts, and probably some kind of port work. The sort of things you want to do to 7M's.
Anyway, half an hour or so of tuning later and I've cracked the 600Nm mark, and I'm happy enough to leave it at that (it was a bit over 5500N tractive effort for all you purists). Wasn't really going for peak power, but all the same busted well over the 180rwkw mark - good enough for me, especially considering I limited myself to 9psi.
As they say, power wins dyno trophies, torque wins races.
The brakes have also been fixed up a treat. In fact now I find myself chewing on the steering wheel as soon as my brain registers the thought "brake". Took a little getting used to, but loving it now.
Well, enough babbling about baby.
-J-
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