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Our test car did put his car on the dyno before and after although he went from a 76 clutched to 74 CD , he will be hitting the track shortly (we just sent him the new textured pulley to test out)
We have these available in every size from 90mm - 70mm. So More data coming in soon!
Edit:
Before: 534 On Dynojet
77mm clutch
Midlength Headers
82mm Tb
No cats or reso
K&n filters
Bwk
FTP HX
630cc injectors
EC tune
Colder plugs
3” intake
3” exhaust
Of course these dynos were taken some time apart, and heat exchangers were changed so take them as you will. We are getting more Dynos as time goes on, but best to have before and afters.
Not really sure how these numbers are relevant... different dynes, different days, and even different pulley sizes.
My thought is that shedding the rotational mass isn't worth rendering your SC unusable for any pulley besides this one. Back to back dyne pulls will tell all though.
Maybe they did and couldn't prove a difference. Removing rotational mass is never a bad thing but whether there is a significant measurable improvement is another thing entirely.
Perhaps.
It would take tight controls in order to demonstrate. With heat management being what it is on our cars the same car with ZERO change can fluctuate power figures + or - enough that the benefit of the weight reduction gets lost in the shuffle.
But, what I'm reading is no attempt was made.
With the momentum of inertia it depends on 2 things, the weight and diameter. This pulley shrinks the outer diameter and reduces weight so 2 victories to be had there.
I just think they should have made the effort to demonstrate that.
After the results come in then we can accurately make cost/benefit choices as the consumer.
I am not convinced a dyno will show anything as I don't think the amount of power required to maintain that increased angular momentum is great enough. I think you will looking at margin of error. You would expect the engine to increase rpm faster with less rotational mass to drive, may be 0-100mph times would be more appropriate? I am not a physicist.
I am not convinced a dyno will show anything as I don't think the amount of power required to maintain that increased angular momentum is great enough. I think you will looking at margin of error. You would expect the engine to increase rpm faster with less rotational mass to drive, may be 0-100mph times would be more appropriate? I am not a physicist.
Removing rotational mass on the engine is felt most in lower gears. Like everything else that spins, the transmissions gears multiply or divide those forces. Well, at least it does so for everythingethat spins in front of the transmission. Everything after the transmission output shaft yields constant results. So, you may be right. Since most dynos use 4th, or which ever gear provides a 1:1 ratio, not all of the benefit may be captured. While the Dyno may capture a small benfit in 4th the ease of angular momentum would be even greater through the previous gears.
We still have numbers coming in, the most difficult thing is to find a vehicle with a 76mm clutched, that wants to go to a 76CD and not 74, or a stock car that wants to stay 90mm, we have one more test car lined up with a 74 fixed, who will be swapping out for 74 CD.
Originally Posted by Davednconfused
Not really sure how these numbers are relevant... different dynes, different days, and even different pulley sizes.
Well thats why I very clearly stated the specifics of the 2 runs, Many fixed pulley customers have no intention of going back to clutched, Changing to a CD is a pure upgrade from a standard Fixed pulley.
[QUOTE=VictoryRoadPerformance;7405130]We still have numbers coming in, the most difficult thing is to find a vehicle with a 76mm clutched, that wants to go to a 76CD and not 74, or a stock car that wants to stay 90mm, we have one more test car lined up with a 74 fixed, who will be swapping out for 74 CD.
how about 83mm numbers numbers -- lots of folks running clutched 83's , maybe they will go for CD option - i like the concept and agree with the poster who mentioned the advantage will be in the rpm from idle to wot - not a 4th gear dyno pull,, these cars are getting so old and devalued right now i dont think its going to matter that much if they are 100% stock or not as long as they are not beat to crap -- keep us posted please
im thinking of installing a used kompressor on my n/a 5.5 instead of a turbo... since the kompressors can be found so cheap these days. this fixed pulley might answer a lot of my problems in regards to programming/needing a m113k ecu for this swap. however i think ill need something more like a 100mm pulley because i want to run low boost on my n/a 55?
We still have numbers coming in, the most difficult thing is to find a vehicle with a 76mm clutched, that wants to go to a 76CD and not 74, or a stock car that wants to stay 90mm, we have one more test car lined up with a 74 fixed, who will be swapping out for 74 CD
.
here is a customer running a 74 clutch delete with 188 modular crank, 102TB, Longtubes, Ported Blower, Stock heads, stock cams, Stock bottom end. (Find me another Stock Motor 55 making 658whp)
Another customer Just ran 10.6 With 180 Lower and 90mm Clutch delete upper
The testimonials are all over the facebook groups. The clutch deletes work, and companies are now copying the design.
This is a testimonial from Travis Howard I have been going back and forth about posting this because he tragically passed away in his sleep before we had a chance to publish this information. He was the person We mentioned earlier in this thread that was testing for us. Im more than happy to show screenshots if anyone has any doubts. But this is what he said after going froma 72mm Fixed to a 72mm Clutch Delete
11/29/18, 7:26 PM
"Had to correct the temps to what my last dyno run was at 555whp. Made 579whp. Running 3 more degrees of timing. And your pulley.
Car gained alot more power and torgue on the low end and mid-range, but not much up top. However, the pulley works
Thinking of a 68 shark bite now"
he ran 11.2 with the 72mm Sharkbite and following mods:
Sealevel and FULL bolt on
Longtubes, straight pipe, cls63 mufflers, 82mm tb, meth, e85, etc
Florida
It's 66f ambient
From 11.5 with 72 fixed to 11.2 with 72 sharkbite
Last edited by VictoryRoadPerformance; Nov 22, 2019 at 05:17 PM.
This is soo awesome and such massive gains, I actually can't believe people think removing the clutch and magnet is a placebo or some other dumb ****. I just want to fix my damn ticking cls55 having a ****ed oil pump so I can mod the SC and do other fun things instead of hearing this gay *** ticking, soon, soon..
The chatter is from the rear bearings going bad, not from the removal of the pulley. I have been running the pulley for over 2 years now. One of the first to do it with VRP. I have done the delete to a 280 and 580 blower both performed great.
The chatter is from the rear bearings going bad, not from the removal of the pulley. I have been running the pulley for over 2 years now. One of the first to do it with VRP. I have done the delete to a 280 and 580 blower both performed great.
I was saying any non clutched or fixed setup is said to cause chatter - but that’s good anecdotal evidence, and I just changed the bearings last night. I have to order some stuff from them anyway. I’ll speak to them.
The chatter is the slop in the gears. You can make the noise just by turning it by hand. Second if you had the same size pulley clutch or no clutch I can bet that the power would be the same. Yes less weight with none clutch but you are not creating all this hidden power. Just my 2-cents.
I know the highest horse power stock blower E55 in the world runs a clutched pulley, and the fastest E55 in the world runs a clutched pulley also.
Yeah, There should be some pretty big shakeups this year in the fastest 55ks, There are people building some pretty ridiculous machines right now. We all know how great the stock supercharger is, just because the fastest car right now is running clutched really doesnt mean anything at all..
here are the facts, Fixed/CD setups are instant boost and they are lighter. I would be willing to bet if the "fastest car" switched to a clutch delete, it would STILL BE THE FASTEST CAR. I bet you if the highest horsepower E55 in the world switched to a clutch delete pulley it would STILL BE THE HIGHEST HORSEPOWER.
Originally Posted by SICAMG
The chatter is the slop in the gears. You can make the noise just by turning it by hand. Second if you had the same size pulley clutch or no clutch I can bet that the power would be the same. Yes less weight with none clutch but you are not creating all this hidden power. Just my 2-cents.
Its not, its the same boost, but removing the rotating mass is effectively adding a lighter crank pulley or flywheel, it also reduces belt slip. When you put the clutch delete on, sit in the car and rev the engine the RPMs raise faster, and drop faster. There is a definite and noticeable difference.
Given that for probably the last 6 months the Clutch delete pulley has been our #1 selling 55k product we are probably up to 250+ sold, People are extremely happy with it.
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