timfoster405
forum member
Hello All…I should be picking up my 07 GT today with an E-Force installed with a 3.50 pulley (may go w/ 3.25)… but I wanted to let everyone “chew” on why I went with the Edelbrock over a Whipple… (Tillman’s #004 unit…good deal along with some history)
I went back and forth for months… agonizing over this decision…but in the end I went with the Edelbrock because:
1. Slightly better performance in the blower efficiency category
2. Eaton’s long standing reputation for quality/OEM experience
3. No internal compression during vacuum operation (zero hp to drive the unit while cruising)
4. LOOKS!!! (Just plain cool layout/design of the unit)
5. Engineer who designed it went to my Alma Mater
During the long process of trying to decide, I begged Whipple and Eaton for blower performance maps (which I did finally receive). I also came across a set of graphs apparently from Magnuson that seemed to comply with Eaton’s blower map too. The bottom line conclusion from the Maps is that the two blowers are very close in performance at least at the 10-12 psi level or 450 to 550 rwhp level. See attached .pdf for the graphs and the summary below (NOTE: Please do not shoot the messenger here, only taking a scientific look at the data I have… and yes it could all be B.S. if you want to make that point, but don’t)
Initial Conditions for both blowers: 12 psi, 12,000 blower rpms (~6000 engine rpms) - ~12 psi boost
Flow: TVS – 900 cfm Whipple – 900 cfm
Delta Temp: TVS – 140 deg F Whipple – 173 deg F (w/o aftercooler…)
Volumetric Eff: TVS – 95% Whipple – 92.5%
Isentropic Eff: TVS – 68% Whipple – 60%
(listed as Adiabatic for the whipple, there is a subtle difference, but don't know??…)
(Flow: The Magnuson chart shows 950 cfm for the TVS)
Conclusion: The TVS does not heat up the charge as much as the Whipple… but with good aftercooling… it really should not make any difference anyway….
Constructive Comments are welcome!!
I went back and forth for months… agonizing over this decision…but in the end I went with the Edelbrock because:
1. Slightly better performance in the blower efficiency category
2. Eaton’s long standing reputation for quality/OEM experience
3. No internal compression during vacuum operation (zero hp to drive the unit while cruising)
4. LOOKS!!! (Just plain cool layout/design of the unit)
5. Engineer who designed it went to my Alma Mater
During the long process of trying to decide, I begged Whipple and Eaton for blower performance maps (which I did finally receive). I also came across a set of graphs apparently from Magnuson that seemed to comply with Eaton’s blower map too. The bottom line conclusion from the Maps is that the two blowers are very close in performance at least at the 10-12 psi level or 450 to 550 rwhp level. See attached .pdf for the graphs and the summary below (NOTE: Please do not shoot the messenger here, only taking a scientific look at the data I have… and yes it could all be B.S. if you want to make that point, but don’t)
Initial Conditions for both blowers: 12 psi, 12,000 blower rpms (~6000 engine rpms) - ~12 psi boost
Flow: TVS – 900 cfm Whipple – 900 cfm
Delta Temp: TVS – 140 deg F Whipple – 173 deg F (w/o aftercooler…)
Volumetric Eff: TVS – 95% Whipple – 92.5%
Isentropic Eff: TVS – 68% Whipple – 60%
(listed as Adiabatic for the whipple, there is a subtle difference, but don't know??…)
(Flow: The Magnuson chart shows 950 cfm for the TVS)
Conclusion: The TVS does not heat up the charge as much as the Whipple… but with good aftercooling… it really should not make any difference anyway….
Constructive Comments are welcome!!
