Yet ANOTHER blower question/opinion thread...(I know, I know lol)...

[Lightnin440]

Hey guys,

I know from research this has kinda become a dead horse that has been beaten over & over...but I am looking to upgrade blowers once I move back to the US soon and I am debating on running a either a 2.9 or 3.4 Whipple on the beast. I have nothing against KB AT ALL or the TVS (my buddy's GB TVS 5.0 is the nastiest thing in this part of Germany) but I like the Whipple kits, plus it's also my last name (so it'd kinda be like slapping God in the face to be a Whipple, have a GT500 and not use one hahaha).

Back to the point - I am looking to build a good street/strip car. I will be putting in Comp Stage 3 cams, C & R H/E, KB BAP, 80lb injectors, LT's, CJ 65mm TB, McLeod Clutch, LCA's, MMR springs & retainers, etc - but I do want to keep the stock hood (2.9 + 1) and I am apprehensive of ground clearance with the LT's and the 3.4 lowering kit.

My goal with either compressor is a good overall package at around 18-20psi (AFTER LT's/Cams) on pump gas: 91-93 Octane; I know I may have to leave power on the table due to crappy CA & KS fuel. I am NOT looking to build a short block anytime soon (knock on wood) so my concerns are: Is the 3.4 too much blower for me on a stock block/bottom end?? What are the hp/psi limits on a stock block that you guys figure?? Am I being unrealistic in thinking these mods could attain awesome power levels at that psi on pump fuel?? I have searched these forums on previous topics so to be truthful I am leaning more towards the 2.9 (as you may already tell) but I am curious & hopeful the insight you all have may help me out! Esp. if anyone has run each blower. I am not looking to make this thing a mostly track, rarely street car, but I just don't want to be at 18-20psi on a 2.9 and be really winding it out whereas a 3.4 may do the job more efficiently? Please correct me if I am wrong or off on this guys. Thanks!!!! Happy 4th of July!!!!

Fun at The 'Ring!!!!

 

[scandalous]

Why not go ahead and build the bottom end while the motor is out doing the cams. I know you said you did not want to do this in your post but it does make sense to do it now while the motor is out.

 

[bull3441]

Your approach is all wrong, why would you want 18-20psi on pump? Pay the extra $100-200 and get a custom grind cam. You will not get the gain per $ you want with an off the shelf cam. You want to cam make power while bleeding off boost. If you're serious about cams call Michael Rauscher of L&M Engines or have Van of Revan Racing take care of it for you. Boost is a restriction and not a "good" thing as per performance. You're motor won't last with a 3.4 @ 20psi on pump 93. Here's a link of my car with L&M cams, TVS 779whp @ 15.8psi on 93 oct. Parisi GT500 with L&M custom cams - YouTube You're gonna spend $4k and gain 35-40whp with Comp Cams, not smart $. And in the end it's bout the tune. Take a look at this thread I started http://www.svtperformance.com/forums/svt-shelby-gt500-150/811855-bmc-blown-motor-club.html

 

[2011SVT]

Or forego the added expense of the cams (if you are not building the bottom at the same time) and get over 700 to the wheel on pump gas with a 2.9 bolt on and supporting mods.

I've been pretty happy for the past two years at this setup and power level and my next stop if a new mill including all the good stuff which will primarily be an E85 motor. That said, I know a number of guys in my neck of the woods *not* building their bottom ends and putting Michael's cams in only. Picking in the neighborhood of 60whp and it sounds truly bad ass. :beer:

You specifically asked though if a 3.4 is too much. No, I just wouldn't do a smaller pulley on it or a 10% OD balancer. OTOH, I think with your octane restriction, a 3.4 is a negligible performance gain over a 2.9. That's also the thought process I went through when I was deciding between 3.4 and 2.9

 

[Lightnin440]

Your approach is all wrong, why would you want 18-20psi on pump? Pay the extra $100-200 and get a custom grind cam. You will not get the gain per $ you want with an off the shelf cam. You want to cam make power while bleeding off boost. If you're serious about cams call Michael Rauscher of L&M Engines or have Van of Revan Racing take care of it for you. Boost is a restriction and not a "good" thing as per performance. You're motor won't last with a 3.4 @ 20psi on pump 93. Here's a link of my car with L&M cams, TVS 779whp @ 15.8psi on 93 oct. Parisi GT500 with L&M custom cams - YouTube You're gonna spend $4k and gain 35-40whp with Comp Cams, not smart $. And in the end it's bout the tune. Take a look at this thread I started http://www.svtperformance.com/forums/svt-shelby-gt500-150/811855-bmc-blown-motor-club.html

WOW, that sounds AWESOME!!! If the gains are anywhere near 60rwhp I'd be stoked! What mufflers are you using?? I will prolly end up going the 2.9 route, with LT's and L&M cams then...that will prolly yield be quite a bit of great power!! Thanks!!!