• Sign Up! To view all forums and unlock additional cool features

    Welcome to the #1 Explorer ST Forum and Explorer ST community dedicated to Explorer ST owners and enthusiasts. Register for an account, it's free and it's easy, so don't hesitate to join the Explorer ST Forum today!


**[emoji373] Built Motor Update! [emoji373]**  

Messages
340
Reactions
632
Points
117
Location
Marinette, WI, USA
#1
** Built Motor Update! **



We are excited to share the latest developments on Matt and Katty's built motor project. We have achieved an impressive output of 751 AWHP and 693 ft-lbs of torque, utilizing stock frame CR Performance Engineering turbos on pump E85 with the Nostrum High Performance Stage X fuel system. Yes, for those keeping track, that's e85 all DI! No mixing, no added port injection.



In our previous post, we discussed the recurring issues with main caps lifting and walking around in high torque applications. Instead of moving away from our goal of a high-performance built motor, we developed a robust crank support to replace the factory sheet metal girdle. The original motor, which experienced a spun main bearing, was meticulously reassembled with a new upper block, a new crankshaft, and our innovative support girdle with main studs installed.



Following an extensive break-in process, we successfully escalated the power output to over 750 AWHP. The new CRP turbos, deployed for us by Andrew, performed exceptionally well, enhancing the top end performance and providing a freaking amazingly smooth power band maintaing over 620 ft-lbs of torque consistently while in boost making for the best power band I’ve ever seen in an Explorer ST



Looking ahead, we are preparing to test a sister engine that shares the same fueling, turbos, and bolt-ons as Matt and Katty's engine. The key distinction will be the compression ratio; while Matt and Katty’s engine is 9.5:1, the upcoming engine will feature a higher 10.5:1 compression ratio. We are eager to analyze the performance differences and potential enhancements this change may bring.



Stay tuned for further updates on our progress and successes. #BuiltMotor #EngineeringExcellence #PerformanceEngineering



Sent from my SM-S938U1 using Tapatalk
 

Messages
2,161
Reactions
1,000
Points
252
Location
Nevada
Vehicle
'20 Raptor, '22 Explorer ST, '14 GT500, '03 F150
#2
Those are crazy numbers! The stock compression ratio is 9.5:1 right? Excited to see those 10.5:1 numbers.
 

OP
ZFGracing
Messages
340
Reactions
632
Points
117
Location
Marinette, WI, USA
Thread Starter #3
Those are crazy numbers! The stock compression ratio is 9.5:1 right? Excited to see those 10.5:1 numbers.
Correct! Here are the pistons side by side for a compression!


Sent from my SM-S938U1 using Tapatalk
 

Last edited:


Top