Circle D converter with whipple

[Platinum_5.0]

When I run the online calculators with total weight and trap speed, it gives me 825HP at the wheels, so it seems to be in line. I believe the rule of thumb is 15psi doubles the HP, so that's in line as well. Different configurations, transmissions, tuners, DA, etc., produce different results, so it's hard to do direct comparisons.

I don't see anyone posting up 1/4 mile times, just trap speeds. What kind of times are you running? I would think at 144mph you should be in the low to mid 9's.

10.0 at 144 with a 1.65 60ft. I did a 1.57 60ft but lost a fuel pump on that run. Should have been a 9.7 pass or so. Winter here now so need to wait

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[Kirill]

I have a Whipple and a Circle D - The car originally had a 245mm 4C when it was NA and I liked it a lot, but you could definitely tell it had a loose converter in it. Once I put the Whipple on and got it out to the track, I sent Circle D the data logs and they convinced me the car needed a 252mm 2C (I think that's right). That slowed the car down, both 60ft and quarter mile.

I discussed this with them and ended up sending them the original 245mm converter which they 'tweaked' for my setup, and I'm happy with the results. On 15psi the car has gone a best of 9.92 at 139mph and a best 60ft of 1.400. On the street, which is 99% of the time (with 10psi), it's still obvious it's got a loose converter, but it drives just fine.

Hello, guys

I installed 3600-3800 circle D for my Mach 1
Kindly let know:
1. 3800rpm is maximal or I can do 4000 safely?
2. Do you have experience with 2nd gear start with circle D? I have 900whp and I am afraid that it would be bad 60ft from 2nd gear or not?

PS on stock stall I have 9.7 on 1/4 but from 1st gear

 

[K4fxd]

Loose converter is great, as long as it locks in high gear.

 

[Kirill]

Loose converter is great, as long as it locks in high gear.

Kindly explain, what do You mean?
Didn’t understand

 

[cbrtrx]

Kindly explain, what do You mean?
Didn’t understand

Lockup will all be in the tuning. Leaving in 2nd gear is fine at your power level.

 

[Kirill]

Lockup will all be in the tuning. Leaving in 2nd gear is fine at your power level.

Brevin has 60ft 1.37 from 2nd gear… but he has g3R 90 or 95 pulley (+ 50hp more then mine)

But we don’t know what Circle D he have)
I have 3600-3800, hope for good 60ft

Do You know, can I raise rpm to 4000 or even more than 3800?

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