Centrifugals and Low End Torque

[bluebeastsrt]

Do you still have the Dyno sheet form the cobra?

I thought it might have been a type also.

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[Zinc03svt]

Do you still have the Dyno sheet form the cobra?

Yes. somewhere. That was like back in 2005-06. Just look up 2.8 upper pullied cobra dyno #’s. It made 460/472 through stock cats. Mods were K&N Fipk, 2.8 upper pulley, and Maggie axle back. Tuned on dyno by Sam @ Steeda. Torque was huge table top. But, it would heak soak after 1-2 pulls.

 

[Zinc03svt]

I cannot find that sheet. I know I have a picture of it in my laptop somewhere. Here is one pretty close. Looks like belt slip past 5k.

 

[Burkey]

This makes almost zero sense to me.

99.9% of the time you are below 3,000 RPM you are cruising. The Coyote has plenty of torque to cruise with 5-15% throttle application in traffic and cruising around. It will accelerate faster than average traffic acceleration speeds in higher than optimal gears (30mph to 60mph in 4th or 5th). From a stop light and accelerating from idle, the Coyote has plenty of grunt in 1st or 2nd (from a stop) to accelerate quicker than most traffic.

In no situation does anyone who wants to make very very fast progress just floor it in 4th, 5th or 6th gear from 1500 RPM. EVERYONE downshifts to 2nd or maybe 3rd for that maneuver to put the engine at its maximum power efficiency band (4500-5500 RPM), and 95% of the guys in the USA have automatics anyway so needing gobs of torque from 1500 RPM to 3000 RPM over what the Coyote naturally provides in N/A form is 100% pointless as the automatic gearbox will downshift to the best gear anyway (and likely put you at 4500-5500 RPM).

So, quite frankly the comment about lacking low end torque is bullshit and irrelevant.

Just my 2 cents.

“99.9% of the time you are below 3,000 RPM you are cruising“
Agreed.
Now for some math.
15-17 MT82 3rd gear is 1.686, 4th is 1.315
18-20 10sp 4th is 1.77 5th is 1.52 6th is 1.28

So, using a 1.686 ratio, the car is capable of blowing the tyres off at 2k (25mph) but not in 4th (1.315)
For equivalency in a 10sp car, assuming all else to be equal, this means it will do the exact same thing in 4th gear (more easily than the MT82) and highly likely do the same thing in 5th gear.

“EVERYONE downshifts to 2nd or maybe 3rd for that maneuver to put the engine at its maximum power efficiency band (4500-5500 RPM)”

Do they? If they aren’t making enough power, yes, they might be forced to.
Why would you need or want to shift down if the gear you’re in will bake the tyres already?

Ok, go fit some drag radials to the car. It now hooks (hopefully). Great.
Is THAT what the owner is doing?
Did we bother to ask them if the car was manual/auto?
Did we ask them if they’re going to fit a drag radial?
Did we ask them if that’s what THEY plan to do with the car or did we just assume that it’s an auto, running a drag radial and their ultimate goal is to win races?

That’s the problem here. There seems to be this view that peak power is all that matters, based on the assumption that “fun” only comes from winning races.

For clarity, I’m not arguing that centri’s (or ANY combo for that matter) don’t have a place. What I’m saying is, until you know what the owner wants from their car, OR how they plan to drive it/use it, you can’t provide a critical analysis of what might suit them best.

Simply asserting that “EVERYONE is going to downshift” is completely based on your experience with a vehicle that either makes a tonne of grip OR doesn’t make enough power down low, or maybe even a combination of the two, which necessitates/facilitates the shift that you’re assuming “everyone” has to make.

We aren’t all the same, that’s for sure.

 

[ahl395]

I have no problem passing people while cruising at say 60-65 in 6th gear. Maybe just me

What gears you have make a big difference in this too. Not that it was important, but I gained alot of power in 6th gear switching from 3.15 to 3.55

 

[revinto7]

P1sc1 stg. 2 with 4.63" pulley, pump gas. 2017 mt82 3:73 rear. 10:1 compression shortblock. Stock heads/cams. 2018 intake manifold, imrc lockouts.

A slow car compared to many on the forum.

Against a friends 2018 ZL1 camaro...

and that right there is what i love about centrifugal cars .if that was an A10 forget about it totally there would have be no pause or boost loss between shifts .

 

[EgoBoost]

Sorry to bring this thread back...great info on Centris in here. Helped me decide on my next FI project without having to start another “Which one...” thread.

 

[TGGT]

Sorry to bring this thread back...great info on Centris in here. Helped me decide on my next FI project without having to start another “Which one...” thread.

so what’s it going to be ? Centri?

 

[EgoBoost]

so what’s it going to be ? Centri?

Yes sir. Had a Whipple not long ago. Great power, but high idle issues (132mm TB), high IAT’s (in FL), and left me stranded when it threw a belt. Ran Vortech’s back in the 90’s and had great results then. Leaning towards Procharger this time around.

 

[Toy Cobra]

I would go p1x “minimum” stage 2 kit and call it a day!

 

[EgoBoost]

I would go p1x “minimum” stage 2 kit and call it a day!

Thanks. Rob @ PBD just recommended that setup option! Any advantage over the D1X in lower rpm range?

 

[TGGT]

Thanks. Rob @ PBD just recommended that setup option! Any advantage over the D1X in lower rpm range?

They say there is. I’m running a stage2 with a d1x and I’m not finding a shortage of low end power just a shortage of traction. Going to need to invest in a drag setup soon

 

[80FoxCoupe]

Thanks. Rob @ PBD just recommended that setup option! Any advantage over the D1X in lower rpm range?

LOL

 

[SolarFlare]

LOL

You know bro, for when you want that pUsH!

 

[EgoBoost]

LOL

I thought that was ironic considering the thread lol.

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