Questions about Whipple.

[JHC95]

I'm looking into a new SC kit for my Cobra. I've heard that you need a built motor to run a 2.3 or 2.9 Whipple. Is this true?

 

[98 Saleen Cobra]

No not even close.. 03/04 Cobra I assume based off sig.

 

[JHC95]

Yeah 2003. I've seen that the stock motor can withstand 700+HP so that's why I wasn't sure when I heard that about Whipples.

 

[98 Saleen Cobra]

They hold a lot of power more than 700.. There are stock motors holding 800rwhp just fine with 2.9's at 25psi.. You're fine throw one on there.. IDK who the hell told you that and if it's a shop stay very VERY far away from them.

 

[JHC95]

appreciate it. I know I sound like a dummy but I recently purchased my Cobra and have tons of questions.

 

[rattlesnake3:16]

appreciate it. I know I sound like a dummy but I recently purchased my Cobra and have tons of questions.

Don't feel like a dummy there isn't a lot of cars that can hold that kinda power on a stock engine so it's better to ask and be safe then assume. But go tvs

 

[TurboGA]

upgrade fuel system first, injectors and fuel pumps. Then a Whipple or TVS would be good..:coolman:

 

[JustaGT5408]

Stock motor will handle it just fine with a good tune. 2.9 with 24-25 psi and you will be grinning from ear to ear.

 

[SnakeBoostE85]

I'm running a 2.9L Whipple E85 and LOVE IT!!

I was only running the stock 3.5 pulley at sea level and getting about 19-20 PSI. I would definitely recommend you go with a massive fuel system - pumps, injectors, return system and run E85!!


Question for some of you guys though… when I moved to CO, I pullied down to a 2.75 to re-capture my boost… I'm just concerned that the 2.75 is putting a lot of extra heat/RPM stress on the blower. I'm only making around 20-21 PSI at my altitude, but I'm just more concerned about RAW RPM's at this point.

what is the upper RPM Limit of a 2.9 whipple? and how many RPM's it turning at 6500 with a 2.75 pulley and stock lower?

 

[TORQJNKY]

I'm running a 2.9L Whipple E85 and LOVE IT!!

I was only running the stock 3.5 pulley at sea level and getting about 19-20 PSI. I would definitely recommend you go with a massive fuel system - pumps, injectors, return system and run E85!!


Question for some of you guys though… when I moved to CO, I pullied down to a 2.75 to re-capture my boost… I'm just concerned that the 2.75 is putting a lot of extra heat/RPM stress on the blower. I'm only making around 20-21 PSI at my altitude, but I'm just more concerned about RAW RPM's at this point.

what is the upper RPM Limit of a 2.9 whipple? and how many RPM's it turning at 6500 with a 2.75 pulley and stock lower?

Whipple's advertised max rpm for the 2.9 is 18,000 rpms.

Here is a RPM chart for a supercharger like a Whipple, KB or Eaton
Take the last number and multiply it by the max engine RPM and you'll see how hard your spinning the SC.
Example: 2.93 upper 7.5 lower =2.559 X 5500 engine RPM = 14,074 blower RPM

Upper..... Crank
Pulley.......Pulley
------------Stock lower
--2.5 ----- 7.5 = 3.0
--2.7 ----- 7.5 = 2.777
--2.75 ---- 7.5 = 2.727
--2.93 ---- 7.5 = 2.559
--3.0 ----- 7.5 = 2.5
--3.25 ---- 7.5 = 2.32
--3.375 --- 7.5 = 2.222
--3.5 ----- 7.5 = 2.14
--4.0 ----- 7.5 = 1.875

-----------#2 LOWER
--2.5 ----- 8.0 = 3.2
--2.7 ----- 8.0 = 2.96
--2.75 ---- 8.0 = 2.909
--2.93 ---- 8.0 = 2.73
--3.0 ----- 8.0 = 2.666
--3.25 ---- 8.0 = 2.461
--3.375 --- 8.0 = 2.37
--3.5 ----- 8.0 = 2.285
--4.0 ----- 8.0 = 2.0


----------#4 lower
--2.5 ---- 8.5 = 3.4
--2.7 ---- 8.5 = 3.148
--2.75 --- 8.5 = 3.09
--2.93 --- 8.5 = 2.90
--3.0 ---- 8.5 = 2.833
--3.25 --- 8.5 = 2.615
--3.375 -- 8.5 = 2.518
--3.5 ----- 8.5 = 2.428
--4.0 ----- 8.5 = 2.125


-----------#6 lower
--2.5 ----- 9.0 = 3.6
--2.7 ----- 9.0 = 3.333
--2.75 ---- 9.0 = 3.272
--2.93 ---- 9.0 = 3.07
--3.0 ----- 9.0 = 3.0
--3.25 ---- 9.0 = 2.769
--3.375 --- 9.0 = 2.666
--3.5 ----- 9.0 = 2.571
--4.0 ----- 9.0 = 2.25


-----------#8 lower
--2.5 ----- 9.5 = 3.8
--2.7 ----- 9.5 = 3.518
--2.75 ---- 9.5 = 3.454
--2.93 ---- 9.5 = 3.242
--3.0 ----- 9.5 = 3.166
--3.25 ---- 9.5 = 2.923
--3.375--- 9.5 = 2.814
--3.5 ----- 9.5 = 2.714
--4.0 ----- 9.5 = 2.375


-----------#10 lower
--2.5 ----- 10 = 4.0
--2.7 ----- 10 = 3.7
--2.75 ---- 10 = 3.63
--2.93 ---- 10 = 3.41
--3.0 ----- 10 = 3.333
--3.25 ---- 10 = 3.076
--3.375 --- 10 = 2.96
--3.5 ----- 10 = 2.857
--4.0 ----- 10 = 2.50

 

[Teviinz]

from what Ive seen the 2.3 out shines the 2.9 when they both are under 20psi. when you go into the 22-25 psi I would just get the 3.4 because its only 200 dollars more the the 2.9 on lethal performance.

 

[SnakeBoostE85]

from what Ive seen the 2.3 out shines the 2.9 when they both are under 20psi. when you go into the 22-25 psi I would just get the 3.4 because its only 200 dollars more the the 2.9 on lethal performance.

The 3.4 doesn't fit under the hood, the 2.9 barely fits as is… the oil fill screw rubs against the hood liner heat shield . And I'm not so sure about your comment on the 2.3 vs. the 2.9. 2.3 TVS - like VMP yes clearly more efficient. But its not just about boost… its about air volume also. Just like back in the old carb days with high rising manifolds. I think a 2.9 at X psi is going to make more power than the 2.3 at the same boost level.

If you want to go thru the modification headache of installing a 3.4, shitty looking high riser hood, or lowering the motor down (god help you), then by all means sure get the 3.4