Opinion on 2.9 whipple

Considering purchasing a GEN 4 2.9 whipple from lethal, but I am undecided if i should purchase the new Gen 4 non crusher or a low mile Gen 3 Crusher that a friend has for about the same price?

What are you opinions based of performance and efficiency of the newer blower compared to the older GEN 3 crusher. The car will be on E85 next month if not sooner?

What are your goals?

I personally went with the gen 4 std inlet because I dont ever really plan on going over 800.

I also didn't want to deal with fitment issues due to the crusher.

IMO you can go wrong either way but I'd lean towards the gen 4

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I'll echo what Nate said. Those are the same reasons I went with the standard inlet. I never plan on running more than 23psi. With the stock 3.5" pulley I'm seeing 18psi.

Appreciate the input fellas I'm hoping to push 720+. I have all the supporting mods but have not done head studs. For now i plan on staying conservative. My buddy made over 800 on this GEN 3 crusher just curious what the GEN 4 standard inlet is capable of?

Stage 4.6 said:

Appreciate the input fellas I'm hoping to push 720+. I have all the supporting mods but have not done head studs. For now i plan on staying conservative. My buddy made over 800 on this GEN 3 crusher just curious what the GEN 4 standard inlet is capable of?

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I made around 600hp (depending on who you ask) last weekend with that 17-18psi and only 12 degrees of timing. I think I messed something up in the tune, but I haven't had a chance to see if the changes I made worked. I think with E85 700hp is possible. Or really close to it at least.

the gen 4 will supposedly be good for another 25 over the 3 given all things being the same. i have a gen 4 crusher and i can tell you it makes some power. dont have a dyno number yet but its rocking. and yes the crusher takes a little work to get in but it really isnt that bad. i say go for the crusher if you can swing it

They’re both badass blowers. You’ll barely be spinning the Gen 3 to make 720 on E85. I think KD made like 820 on 23 psi.

Stage 4.6 said:

Appreciate the input fellas I'm hoping to push 720+. I have all the supporting mods but have not done head studs. For now i plan on staying conservative. My buddy made over 800 on this GEN 3 crusher just curious what the GEN 4 standard inlet is capable of?

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The 2.9 is a great blower. I have the gen 1 2.9 and I made 710rwhp on vp100 22lbs of boost. standard inlet. And my car is a under achiever. It always made less than a lot of cobras. That blowr just makes great power. so if we can make big power with the first run 2.9 with the standard inlet, anyone you choose will get you 720

Yes KD, made some serious power, with that GEN 3 crusher, but his car is cammed and has the head studs as well. I'm just curious if the GEN 4 standard inlet is capable of big numbers as well and what differences are there in the blowers aside the crusher intake?

Im leaning towards the GEN 3 crusher but i was not aware of the fitment issue.

All generations and sizes of the crusher inlet will slightly rub on the hood unless you have the subframe spacers or clearance the hood a little. That being said, the crusher will grossly outflow the standard inlet over 23 psi.

Differences between the Gen 3 and 4, rotor clearances. Whipple started machining their rotors in-house and to tighter tolerances. The Gen 4 is worth about 20 peak whp over the Gen 3. Straight from Whipple tech support.

The Gen 5 has several improvements over the 4 such as crusher inlet shape (more cross-sectional surface area equals less restriction which equals more flow) and I believe the rotors are even improved upon over the 4.

Thank you sir! really appreciate your input.

I have a gen 4 that just got the dyno done last week and made 706 on e85 with I believe 19lbs Of boost. Not mad. I’m sure I can get to 800 with it but wanted to keep the boost between 18-20.

esonu said:

I have a gen 4 that just got the dyno done last week and made 706 on e85 with I believe 19lbs Of boost. Not mad. I’m sure I can get to 800 with it but wanted to keep the boost between 18-20.

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Was that a crusher inlet? Would you happen to know the tune specs?

esonu said:

I have a gen 4 that just got the dyno done last week and made 706 on e85 with I believe 19lbs Of boost. Not mad. I’m sure I can get to 800 with it but wanted to keep the boost between 18-20.

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It made good power but you are not using that blower for what its meant for. I am also betting at 18-19lbs your car doesn't hit hard as well. The gen 4 and gen 5 whipples, if you are going to be running low boost, they will not perform any better than the lower generations. The gen 4 and 5, the only way you are going to see any difference is if you run big boost. I spoke to a few guys that ran the first batch for whipple. crusher inlet 2.9's gen 4 and 5 you need to throw boost at them. 18 lbs, its like running a 88MM turbo on 15 lbs. I understand you have room to grow but if you are never going to run more boost, your car will not run how it should. 18lbs I would have bought a vmp. Hands down. Have that crazy low end and still make good power. Just my thoughts. Its your car.

I bought the 2.9 bc I knew it was going to be ran on race gas or e85. Nothing less than 22lbs.

"stangfreak" From what i've read in previous threads, that seems to be the consensus! These 2.9s like boost. I was just under the impression that the newer GEN 4 and up where more efficient and made the power with less boost.

I assuming from what everyone has posted above that the GEN 4s standard inlet are capable of mid 700hp range with the right amount of boost?

So what I'm debating is, if i can get a used GEN 3 Crusher for the price of a new GEN 4 standard inlet, would it be worth it?

If you're at elevation, like a lot of places in Colorado......I would want every advantage I could get. Gen4 crusher at a minimum. Go bold and spin it. You need all you can get to create the atmosphere you would like the motor to operate in. Sea level opinions on this might be different. Maybe a standard inlet gen4 is plenty.....not so @ 5000 feet plus.

I got the GEN 4 CRUSHER
#’s 701rwhp @ 17lbs on E85

I’ll be going back for more......




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I got the crusher because I knew I’d be spinning it at least 25psi. The car was visceral at that boost level. Hit just as hard down low as the little blowers but freight trained like nothing else all the way to redline.

c6zhombre said:

If you're at elevation, like a lot of places in Colorado......I would want every advantage I could get. Gen4 crusher at a minimum. Go bold and spin it. You need all you can get to create the atmosphere you would like the motor to operate in. Sea level opinions on this might be different. Maybe a standard inlet gen4 is plenty.....not so @ 5000 feet plus.

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Good observation! I am definitely 5000 ft above, and will definitely let her eat on the E85, just want to make sure that the motor can handle it. I don't want the car to be on the ragged edge.

Stage 4.6 said:

"stangfreak" From what i've read in previous threads, that seems to be the consensus! These 2.9s like boost. I was just under the impression that the newer GEN 4 and up where more efficient and made the power with less boost.

I assuming from what everyone has posted above that the GEN 4s standard inlet are capable of mid 700hp range with the right amount of boost?

So what I'm debating is, if i can get a used GEN 3 Crusher for the price of a new GEN 4 standard inlet, would it be worth it?

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I know they said the new blowers are moref efficient, they do make more power, but I just dont know how much of a difference in gains they make at low boost levels. is it worth spending the money, doing the swap, at low boost levels. That is what I am trying to say.

Now if you are going to run 25lbs and up, I would consider the gen 4 or 5 crusher. I purchased the first run 2.9 with standard inlet bc I love how my car drives on the street with the billetflow throttle body. But it still made power at 22lbs. The car was impressive.

when the 2.2 kenne bell came out, people were running 15lbs of boost and made decent power. more than the ported eaton. But, when they ran, the ported eaton with a aggressive pulley combo was kinda neck and neck with the kenne bell car. The peak hp number was cool and all but, it just wasn't being spun properly.

If you have access to e85 race gas, get the gen 4 or 5 crusher. Run the right amount of boost. If you want to run pump gas low boost, I would consider another blower. Thats jut me. some people are happy running a 2.9 on 18lbs pump gas. It all depends on your goals. Im not one of those guys who likes to run twinscrews on low boost. Been there done that since 2003.