Interesting low buck intake stuff for big hp
I have been screwing around with various CAI's lately. I have found some interesting things. AEM's intake works the best with a non cammed motor. PR's works pretty good on a cammed motor and makes real good midrange.
Hotshots intake had the highest MAF voltages, but didnt make any more power on engines that are cammed out and less midrange than the PR. Well I put my wideband A/F meter on a friends car and found that the HS runs on the lean side and the MAF doesnt compensate entirely for the gains in flow. The HS was putting out 4.56 volts at the fuel cut, a lot for just a bolt on motor with S4's.
Well I installed a Nismo FPR and raised the fuel pressure 4 psi to maintain a 13:1 A/F ratio and man was the car faster! It made so much more power, it was spinning 2nd gear. In my prior testing NA stock compression SR's make the best power at 13.2:1 or so, but this is right on the edge of lean.
I am going to dyno probably this week to see what the results were but it feels like at least 5 hp. This means the combo of HS CAI and Nismo regulator makes 10 or more whp for a pretty cheap price.
This motor made 156 whp prior to this and I think it will show that a low buck bolt on motor can do over 160 whp, nuddging what an ITR can do stock.
Mike
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