I am certain this has come up before....but does anyone have any dyno results of a 700 horsepower (higher rpm motor) comparing the SP1 intake to the SPX? I would also be interested in knowing if the dyno tests utilized the ice water feature either against the SP1 or the SPX was tested with and without for comparison......
No dyno numbers,But I can tell you that back to back passes at the track netted the same ET within the same hour and the same density altitude. This was on my car with a Wildcat and then an SP1.
Keith on my nephews car I took the Wildcat intake off my car and he did 3 dyno pulls with the SP1 and switched manifolds and picked up 30 HP, they are both Dominator type intakes too. When he put my intake on he also had to increase the jets 2 sizes because it went lean. Both intakes had no port work other than port matching.
Wow! I would never expect that. So you are talking peak HP? At what rpm did it pick up and how long did it last? Swapping them at the track would be interesting.......
The SPX is the old cool runner from Kenne Bell. That manifold has always been worth 5 more HP than the SP1. The Wildcat intake was still just below the cool runner now the SPX.
Understood, I am aware of the history of this intake but have never seen any dyno results or track comparison that takes full advantage of the use of the intake utilizing the ice water plenum.
I think you might find something from a Kenne Bell website. I remember them doing a series on that topic. They may have a link to that info. This was done in the 90ies ..
Hi Keith, I don't have data for a 700 HP motor, but did test the water system with a 600 HP street motor once. This was with a heavily worked over KB coolrunner Test 420 is with the water system. We cooled the intake with a pump and ice water to 90* before the pull. As far as SPX and SP-1, it depends on which version of the Sp-1 we are talking about. The early one will show a significant reduction in power compared to an SPX, in an out of the box test. The old SP-1 used to take 6 hours of porting to bring it around. I would believe that a 650-700 HP motor would in fact show 20-30 HP difference. I have not done that test, but have tested the latest version of the SP-1 with an SPX, 650 HP street/strip motor. That test showed that you trade approximately 10 ft lbs at peak torque, for 10 HP at Peak HP, when you compare the two. The SPX is a little weaker down low, but stronger up top.. The differences would be more pronounced as you increase airflow. I would absolutely believe that a Ported SP1 vs a port matched SPX, with 650-700 HP, might not show any difference in a track test. They are so close that any little variable will make them run the same. That said, the SPX is the 700 Plus HP manifold, too bad it's only available in the standard intake port configuration. A TE head (tall port) SPX intake manifold with TE/STG 3 heads would be the best combo, if one existed. JW
Keith, My nephew is away I know he saved the dyno sheet I think, I will ask him for it. He did take the car to the track but it was hot, so he only pick up 2 tenths. The car had a 455 with a 308s mild ported stage 1 heads 11:1 comp. it ran low 11s @ 120mph. The day at the track it ran 10:93 124mph.
What was the rest of the engine combo of this engine? This is test results of a Wildcat with and without cold water?
Yes, Graph is with and without water cooling of the intake. That was the prototype for the Level 2A motor , that I built in about 2005. Went into a 3700 lbs Regal that ran 10.70's down south I believe. It has had a couple owners, I know one sold it because it scared him to drive it.. There are videos of this thing idling on U-tube. Motor is 464 shortblock 10.6 compression Stage 1 SE heads, my standard upgrade set, 315/225 at .500 TA 298 cam (241/241 on a 110*) flat tappet Hydaulic non girdled deep oil pan 1000/ TQ 1000 HP (we tested both) TA 1 7/8 long headers We also tested this motor with shorty headers and exhaust manifolds. This one was wild, enough vaccum to run the brakes (just barely) and switching from a Stinger S4 to An MSD 6AL made quite a difference in the idle quality. JW
The Sp1 my nephew has is the early one. I also have an early one but the floor has been filled I will be putting this intake on another engine I am doing, it will not be done till some time in the fall.
Thanks, this is all very good information. I see an SPX intake in my future as I think my motor will benefit in the higher RPM range with the cold water as a plus....
