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Power Strokes
6.4 Aftermarket
KC Turbos 6.4 turbo testing
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[QUOTE="KCTurbos, post: 1546674, member: 13852"] We are running out of fuel… and have not even touched the HP turbo yet. We tried a couple different 71mm compressor wheels, then jumped up to a 75mm compressor wheel. Made some descent gains, but I think we are starting to get diminishing returns, I think we need more fuel? We are running new injectors, new fuel system, new fuel rails, all new sensors, ad4g, new hpfp, 2200us and not holding 24k… usually 21.5-23k. I just don’t think they make the pumps like they used to. . . What do you guys think? Throw on dual pumps and keep the same tune so we are only running fueling that a stock truck typically sees? Or see if we can squeeze any more out of this fuel system knowing we are dropping rail pressure? Or would that be an “unrealistic” test for stock injectors? 1st picture is showing how much fuel we have left over, that was WOT at Peak hp during the dyno run. . . 1st graph is the loaded dyno run. No noticeable lag at all from the 75 vs 71mm. Carried basically the same power band, but 22hp and 33tq more . 75mm 662hp and 1329tq . 50psi boost and maxing out the EBP sensor at 73psi… we are working on getting a higher reading EBP sensor to keep the data going. . . 2nd graph is the “non-loaded” 2000rpm roll. You can see a little bit of lag this time, not enough to really matter, but it is there. On the streets and driving there is no noticeable difference in lag. . . 3rd graph is just for reference, another 6.4 we had on the dyno recently with an s364.5. The 75mm drop in low pressure spools WAY faster, making 700ft/lbs more than the s364.5 at 2100rpms and makes 29hp more all throughout the rpm band to redline. Now the compounds are making 10-15psi more of boost/ebp all across rpm band. That is going to add a lot of heat/pressure in the motor. I would like to get an s369 to see how it compares in power to the drop in 75mm atmo. [ATTACH=full]178872[/ATTACH] [ATTACH=full]178873[/ATTACH] [ATTACH=full]178874[/ATTACH] [ATTACH=full]178875[/ATTACH] [/QUOTE]
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