whipple 2.9 vs 3.4

[whitesnake86]

Are there any benefits to running a 3.4 over a 2.9? I wanna make mid 700s+ to the wheels if possible on 93. I'm wondering if a 3.4 will help me or if I have the same limitations with it as I do with the 2.9. My car will be mostly a street car. Any input would be appreciated.

Also I know I need a bigger hood for a 3.4. I will not consider lowering my engine

 

[stkjock]

lower IATs

more air flow at lower boost levels

you'll make more power on a 3.4

 

[dirtyo2000]

Definitely a better blower but not really worth the difference to me. If your going 3.4 just get the 4.0 and be done with it. Since your changing out the Hood I would do 4.0. Easy 700 + on low boost and you'll never out grow it.

 

[Carbd86GT]

For a car looking to make around mid 700's, it becomes a personal preference thing on how much work you want to do. Either blower can make that power relatively easily, but the 2.9L requires much less to complete the installation. The 2.9L fits under the stock hood with no modifications, where the 3.4L and 4.0L will require an engine lowering kit which includes lowered motor mounts with K member and transmission cross member spacers.

If you plan on changing the hood or already have changed it, then I would opt for the 3.4L or 4.0L. With the larger blowers, you'll be able to grow into them if you plan on making more power later down the road with a built engine. But like someone else suggested, if you're going to go this route, might just be better to go ahead with the 4.0L.

Hope that helps clear some things up, let us know if we can help you any further.

Thanks.

 

[Goose17]

2.9 is easy-peasy. It fits. Bigger blowers, not so much - but they make mo powa!

 

[19COBRA93]

The 2.9L will reach your goal with ease. Yes the 3.4L and 4.0L have more capability, but there are drawbacks with fitment. So you just have to look at what your ultimate goal is, and what you're willing to do to reach it. I'll be upgrading mine soon because my goal is about a 1000rwh. But for now, the 2.9L is providing me plenty of power considering the limits of the shortblock.

 

[- Aj -]

I'm in the same boat as you, looking at both options. Only diff is I already have a SS hood.

 

[19COBRA93]

I'm in the same boat as you, looking at both options. Only diff is I already have a SS hood.

If your goals are north of 800hp, you're blower shopping, and you have a hood to clear the big ones already, it's kind of a no-brainer to me. Find the best deal on a 3.4L, 3.6LC, or 4.0L and pick it up.

 

[whitesnake86]

Thanks for all the good responses... kinda making me want a 3.4 or 4.0 now ... I'm gonna have to price those out online. I mean if a 4.0 could be efficient enough on my 07 at low boost I guess why not.

 

[- Aj -]

Thanks for all the good responses... kinda making me want a 3.4 or 4.0 now ... I'm gonna have to price those out online. I mean if a 4.0 could be efficient enough on my 07 at low boost I guess why not.

Wouldn't the 4.0 hurt low end torque on the street? I'm thinking a good all around package (my goal) would be with the 3.4, but I would like to hear opinions from people that have used these setups.

If your goals are north of 800hp, you're blower shopping, and you have a hood to clear the big ones already, it's kind of a no-brainer to me. Find the best deal on a 3.4L, 3.6LC, or 4.0L and pick it up.

Kind of what I was thinking.

 

[whitesnake86]

Yea I was kinda worried about the low end power too but I don't know of any similar cars running a 4.0 at low boost on a stock motor. Maybe a 3.4 will be enough for me. Although the lower IAT temps are a plus. Its another 500 $ on top of the 3.4 for the 4.0

 

[- Aj -]

We need some more info from people with experience with these setups...


Anyone?

 

[cobraboss]

I went the 3.4 way. The reason why was, I rather over do it than under do it and not be satisfied. Now with that said the bottom line was a bit more. It's all in what you want and be satisfied. Unless you build the botton end, there's gonna be a point that is as far as you gonna go safely.Cool factor:

PRICELESS

 

[- Aj -]

cobraboss: do you have dyno sheets/fuel used/etc., more info on your setup?

 

[whitesnake86]

Yea I wanna know what's the most I can make with the 3.4 or the 4.0 with pump gas. And wether the 4.0 still has some good bottom end power at low boost

 

[cobraboss]

cobraboss: do you have dyno sheets/fuel used/etc., more info on your setup?

Go to my Dyno #'s in the dyno thread. My list of mods are there. 93 octane

 

[stkjock]

My 4.0, on E85, makes 500 ft/lbs at 2200 rpm

Has made 960 on 24 psi and now sits at 775 on 21#

Fit under stock hood as well.

 

[whitesnake86]

Lowered your engine?

 

[stkjock]

Yes

 

[whitesnake86]

You don't have any issues from lowering it?