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Adjustable fuel pressure on 1.6's???

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#1
Qik Nip

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I have now seen two on-line comments about adjustabel fuel pressure on 1.6's. I was under the impression it was a 1.8 only thing.

Two questions then... First, is that modification approved by SCCA for 1.6's? Second, I need to understand how that modification will gain horespower or torque versus the standard adjustmemt of the AFM and timing on the 1.6.

In my case, I can achieve a near ideal air fuel ratio from 3,000 RPM's to 6,800. (But at the pretty immaterial expense of being too rich below 3,000 RPM's.) How can a higer (or lower) fuel pressure be used to affect HP or torque more advantageously than timing and AFM adjustments alone?

Thanks in advance for the tutorial!
Rick

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#2
James York

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I have now seen two on-line comments about adjustabel fuel pressure on 1.6's. I was under the impression it was a 1.8 only thing.

Two questions then... First, is that modification approved by SCCA for 1.6's? Second, I need to understand how that modification will gain horespower or torque versus the standard adjustmemt of the AFM and timing on the 1.6.

In my case, I can achieve a near ideal air fuel ratio from 3,000 RPM's to 6,800. (But at the pretty immaterial expense of being too rich below 3,000 RPM's.) How can a higer (or lower) fuel pressure be used to affect HP or torque more advantageously than timing and AFM adjustments alone?

Thanks in advance for the tutorial!
Rick


I can only answer your first point. Yes it is legal to adjust FP on the 1.6L. All cars in SCCA have open timing and FP. No idea about NASA.

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#3
Qik Nip

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Anybody chime in on question #2?
Rick

2009, 2010 & 2011 SCCA Great Lakes Div. Reg. SM Champ
2006, 2009, 2010 & 2011 Cincy SCCA Reg. Driver of the year
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#4
Muda

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Waiting for a turn key solution.
Any out there yet?
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#5
Tom Hampton

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Dave wheeler said that he has dyno'd this on the 1.6. He didn't post exact results, but he said it was similar to a tuned afm. But, it only worked with the afm in the stock configuration. He is working on having a turnkey setup available, soon. Not sure exactly when, tho. He already has a setup for the 1.8.

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