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Verdict on 2.3 vs 2.65 for Cobra

Discussion in 'Engine/Tuning' started by ATS, Apr 1, 2021.

  1. MG0h3

    MG0h3 Well-Known Member Established Member

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    I never had an Eaton car or any 2.3 so I can’t compare; my car came with a 2.9 Whipple at 15psi on 91.

    590/540 at AED. These numbers were at sea level with a 3.75 upper.

    Def wouldn’t call it sluggish. Also note I’m at 3800 elevation so I was running a 3.5 upper to make 15 which would be 18psi at sea level so maybe the torque came in sooner.

    315/30 MT drag radials would struggle in second.


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  2. PC03GT

    PC03GT Well-Known Member Established Member

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    What gen 2.9??
     
  3. MG0h3

    MG0h3 Well-Known Member Established Member

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  4. nitrojunk

    nitrojunk Active Member Established Member

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    I have a Gen2 2.3 Whipple on my Cobra ... car makes 646 RWH .. max boost ive seen is like 18-19 lbs ..
     
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  5. SVT_ODIE

    SVT_ODIE Member Established Member

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    What are your supporting mods ?

    Sent from my SM-G973U using the svtperformance.com mobile app
     
  6. ATS

    ATS Member Established Member

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    At least the gen 4 doesn’t”***

    I think that may be the key right there. Selecting a blower is a tough decision to make when you see one person saying that a 2.9 is terrible at 17lbs of boost and it lags horribly and even though you’ll make big hp, it won’t feel that way.. and then you see another person post, with equal conviction, that a 2.9 doesn’t feel sluggish at all at that boost level and it’s actually a blast

    But thanks to your comment, and the following insightful post by @NateDogg on a different thread, I think at least some of this debate could be resolved by clarifying what generation of supercharger we are talking about.
     
  7. ATS

    ATS Member Established Member

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    Nate’s comment:

    “I didn't read the entire thread, but I've had both blowers on multiple cars and my opinion falls in line with what everyone else is saying.

    2.3 TVS is a blast and the removable inlet is very sweet. You don't realize how sweet until you are removing an entire blower multiple times a year for random stuff.
    With that being said... the gen 3+ 2.9 is leaps and bounds better than the smaller 2.3 TVS. I currently have a gen 4 2.9 on pump gas and (although I haven't had it dyno'd/tracked yet) it *feels* every bit as fast as any of my TVS cars and even my gen 2 2.9 e85 car. Its a great blower, looks great and PULLS.”

    That came from this thread https://www.svtperformance.com/threads/which-set-up.1190686/

    Now it’s possible Natedogg has other variables that are confounding his results/experience.. like a built motor etc. and he also doesn’t mention his boost levels

    Nonetheless, it seems possible that the “larger displacement blowers aren’t suited for pump gas/lower boost (17-18lb because they’re sluggish in the low-mid range)” talk may stem partially from people’s experiences with early iterations of the 2.9 whipple (and maybe larger kenne bells), and isn’t quite as much of an issue when considering the newest generation 2.9 whipple. (And possibly vmp 2.65)

    Any thoughts? This is what I’m thinking but I’m pretty new to this stuff
     
    Last edited: Apr 16, 2021
  8. NateDogg

    NateDogg Terminator Established Member

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    Unfortunately, I can't provide any more clarification because I still have a stock boot gauge... However the I do have a stock long block.

    I'm running a 4th generation 2.9 standard inlet...3.2 upper and stock sized lower. Not sure where that puts me boost wise.
     
    Last edited: Apr 17, 2021
  9. 01yellercobra

    01yellercobra AKA slo984now Established Member

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    I've seen a low of 16psi and a high of 19psi on my logs. I'm able to log boost through the MS3. The 16psi was on an 85+ degree night with high humidity. The car was kind of sluggish at the track, but heat soak will do that. Granted I still couldn't hook to save my life. Stock lower with a 3.5 upper.
     
  10. stangfreak

    stangfreak Well-Known Member Established Member

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    Your not making 650rwhp on 18lbs of boost with a 2.3 whipple.
     
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  11. Bdubbs

    Bdubbs u even lift bro? Premium Member Established Member

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    Plenty of "happy" dynos out there. Years ago my tvs only made 576 on 18lbs.

    Sent from my Moto E (4) Plus using Tapatalk
     
  12. me32

    me32 BEASTLY SHELBY GT500 TVS Moderator

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    Depends. If running a 2.75 pulley and free flowing LT exhaust. Its possible.
     
  13. 1Kona_Venom

    1Kona_Venom Glass Roof Mafia Premium Member Established Member Single Barrel Sirs

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    I'll throw my old hat into the ring.
    For me personally, I prefer a 2.3L. But that is because of what I do with my car(s).

    I prefer the TQ being felt in the lower to mid area of the RPM band because on THE STREET, that is where 98% of owners are operating at light to light, some highway pulls.

    Comparison of 93 Octane, same car, same tuner, same day.





    2.9 Whipple Gen 2 Vs VMP 2.3L


    51149058163_51c7c68674_c.jpg
     

    Attached Files:

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  14. 01yellercobra

    01yellercobra AKA slo984now Established Member

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    What boost levels was each blower running?
     
  15. 1Kona_Venom

    1Kona_Venom Glass Roof Mafia Premium Member Established Member Single Barrel Sirs

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    2.9 / 3.50" upper @ 19#’s
    2.3 @ 20.5#'s

    Here was my setup:
    TVS/2.8 pulley/Accufab TB
    Stock Lower
    stock manifolds, o/r Xpipe, LM2 Catback
    JLT HB Intake
    Sct3000
    Lethal Return Fuel System
    80# Inj.
    Spec3+ clutch
     
  16. me32

    me32 BEASTLY SHELBY GT500 TVS Moderator

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    The 2.3 at 20.5 has the advantage its basically at its full potential. The 2.9 with a 3.5 is below its full potential.
     
  17. MG0h3

    MG0h3 Well-Known Member Established Member

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    If he’s on E85 I’d expect those numbers.

    Can’t recall the name but the dude who bought Kevin’s car makes 711rwhp on 21 psi Gen 2 2.3


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  18. 01yellercobra

    01yellercobra AKA slo984now Established Member

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    That's why I asked. I realize with the difference in blower sizes it'll never be a real apples to apples comparison. But as I mentioned earlier something is always changed when the blowers are swapped. I'm sure the 2.9 would've behaved a little different with an extra PSI. I remember going from 12 to 14psi on my D1 made it a completely different animal.
     
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  19. me32

    me32 BEASTLY SHELBY GT500 TVS Moderator

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    I agree. I do know that the tvs will almost always make better lowend tq over the whipple which was what 1Kona_Venom wanted to achieve anyway. Would be interesting had there been a 3.0 or 2.75 pulley on that whipple 2.9. how it would have performed.
     
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  20. 1Kona_Venom

    1Kona_Venom Glass Roof Mafia Premium Member Established Member Single Barrel Sirs

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    I agree w/ this 100%.
    Challenge was fuel; no E85 and they didn't have boostane back than.
     
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