Mazda B2500TD and Courier 2.5TD

Submitted: Wednesday, Apr 25, 2007 at 19:01
ThreadID: 44717 Views:3740 Replies:1 FollowUps:1
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I am very happy with my Bravo B2500TD and hope the following is of assistance to fellow owners.
Please contemplate any potential effects prior to carrying out this modification (I was unable to come up with any negatives and to date have not experienced any).
Suggested mod to improve power on the above vehicles.
In the quest for improved performance I have experimented with the following modification on my 2001 Bravo 4x4 Dual Cab and have had pleasing results.
The mod consists of purchasing 2.0 meters of 4.7mm dia. (3/16") fuel hose and four clamps (cost <$20).
Remove hose connecting inlet manifold to fuel pump diaphram and remove hose connecting turbo waste gate actuator to turbo outlet. Use purchased hose to connect fuel pump diaphram to turbo outlet and connect turbo waste gate actuator to inlet manifold. Secure hoses over engine.
I have found improvements in performance in the range from 1500rpm to 3000rpm and the transition from below boost to over 2000rpm has smoothed out and generally the engine seems to rum better. I have not noticed a significant change in the higher engine rev range.
There does not appear to be any significant change in fuel consumption although this may depend on driving style.
Also, I have found that the following valve clearances (measured between camshaft and valve rocker when cold) work best - 0.08 mm for inlet and 0.18mm for exhaust (these are within the suggested range of 0.05mm - 0.15mm inlet and 0.15 mm - 0.25 mm exhaust).
I would be ineterested to here of results from anyone who tries or who has tried this mod.

Iceburg.
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Reply By: Jimbo 2121 - Thursday, Apr 26, 2007 at 20:10

Thursday, Apr 26, 2007 at 20:10
So the turbo produces more boost as it is sensed from further down the line where there is less pressure (inlet manifold), so it produces more to compensate. And the fuel pump receives a higher pressure signal (direct from turbo) and supplies more fuel.

Am I right?
AnswerID: 235994

Follow Up By: Iceburg - Friday, Apr 27, 2007 at 19:58

Friday, Apr 27, 2007 at 19:58
That is what my thoughts are - take most advantage of pressure differences within the intake system.
If you have a Mazda or Courier please let me know if you give it a try and what your result is.

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FollowupID: 497349

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