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  #1  
Old 03-19-2004, 07:15 AM
asahilover asahilover is offline
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I have an Edelbrock SP2P manifold. My question is would it be worth the 189 bucks to upgrade to an Edelbrock Performer Intake.

This will all be combined with an MSD ignition system, Edelbrock Performer Cam and either an Edelbrock 1406 carb or a Q-Jet 750 cfm, both of which I already have sitting in garage. From past experience I like Q-jets, but it looks worn and the Edelbrock looks new.

Please see my post: Best Cam Intake & Manifold for Mid-Range for more info.

Like I said in the above post it is mainly a daily driver. 3:31's with 31.5 10.5's.

I mainly need highway performance. Yes you can give me as much sh** as you want. But FSJ'S are cool on or off the road.

Thanks,

Mike
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Old 03-19-2004, 11:48 AM
carrotman carrotman is offline
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Your garage sounds like mine, but my engine parts are for vehicles I sold years ago. I can't believe you haven't installed the SP2P manifold yet. It's supposed to be good from idle to 4,000 RPM. Perfect for the highway. Others will tell you to get the Performer, but 6,000 RPM is wishful thinking for most FSJ's.
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Old 03-19-2004, 11:58 AM
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Definitely stick with the SP2P. If you don't use it let me know and I'll buy it and buy another Jeep so I can use it.
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  #4  
Old 03-19-2004, 04:15 PM
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I'm opposite of everyone else. Ditch the SP2P and get the Performer. Sure the SP2P is great for low rpm but it's a very restrictive manifold due to it's smaller runners. It was built mainly for the early smaller port 304v8. The AMC heads are some of the best factory flowing heads ever built, why restrict air into them? Let them suckers breathe. Especially if you have a cam and a larger 4 barrel carb.
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Old 03-20-2004, 02:27 AM
carrotman carrotman is offline
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You're right AMX, if one rides at WFO (Wide Full Open) all the time. The Performer will out flow the SP2P in volume, but nobody ever measures velocity of flow of the AMC head. With smaller openings, the velocity of the mixture has to be greater in the SP2P. Under 4,000 RPM, velocity is more important than volume.

I have a T18 and I rarely go over 4,000 RPM. Do FSJ's with automatics ever go over it? Especially ones with the 2.73 ratio. Asahilover has a 3.31 and wants to use it on the highway. Plus he already has it. Believe me, you don't want to add the SP2P to the pile in the garage.
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Old 03-20-2004, 03:06 AM
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sp2p will choke out most of your power, more like idle to 2000rpm. I agree with AMX the performer is a great manifold for these engines. The AMC engine is a fire breathing monster when equipped with a proper aspiration unit. even the stock 4bbl intake doesnt give it enough. The sp2p has TINY TINY ports. I have loaded them up with a 600cfm carb on a 401...My opinion is that the sp2p is a great mantle and conversational piece but doesnt belong on a motor

[ March 20, 2004, 09:06 AM: Message edited by: jeepsr4ever ]
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  #7  
Old 03-20-2004, 03:12 AM
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The big gains boasted by edelbrock seem like they are most likely taken from the AMC V8 family. 60 ft lbs of torque on a 304 with a cruddy edelbrock camshaft.....not shabby even though its at 5000rpm which isnt hard to hit. Now your 360 will have a similar but different graph depicting a larger tourque number. sp2p was AMC's answer to the gas cruch of the 70's and from my experiences the only really decent power ever gotten out of it is with a low stage 1 camshaft that isnt even sold anymore

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  #8  
Old 03-20-2004, 03:50 AM
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Well, I have seen varying opinions on the SP2P. Have heard they are good for low end torque and I rarely have a long hiway run with it, so gonna put an SP2P, Carter AFB 600 and Comp 260H on my 401 project with 33s and 3.73 gears. Will let y'all know how it works out. Should have it back on the road by end of April.

With weather we have had lately, it will prolly be May sometime now...

[ April 03, 2004, 12:05 PM: Message edited by: Gulf Coast Sharker ]
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  #9  
Old 03-20-2004, 05:41 AM
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Just got finished putting a performer on with a 1406 carb. Feels the same as the stock 2 BBl. until 2000 RPM then holy crap, pulls real hard till the trans shifts, 3800 RPMs. How do you adjust the shift points on this 400 turbo trans, there is no kick down linkage. Do I need an adjustable vacum modulator?

I will tell you this, the War Wagon has never run this smooth, Idle at 500 RPM is rock solid, but moved it up to 700 RPM and 500 RPM in gear.

Jim
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  #10  
Old 03-20-2004, 06:14 AM
asahilover asahilover is offline
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Alright Guys,

This has turned into arguement. I'm going with the Edelbrock 2131. Anyone want an SP2P. Make me an offer, otherwise its going on ebay.

Thanks for your input Fellow FSJ'ers.

I still don't understand the interest in these OPEC pleasing, rusting, hard to find parts for machines. Must be a virus, and I contracted back in 1984.
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  #11  
Old 02-14-2005, 03:26 PM
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OKAY... I have had this SP2P on the 401 since last June. And that 600 turned out to be a 750. It has plenty of low end torque off road, but feels like it is starving above 60 mph on the highway unless I feather the choke down a bit. I am thinking (uh-oh) I wanna try something else. Convince me I need a Performer... Or? Opinions? And I don't care if ya told me so...
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  #12  
Old 02-14-2005, 07:28 PM
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Flint put a Performer on your rig or I'll kick your butt when I come down for Ouray! I'm sure Krista will let me! I do think you need a bit smaller carb that 750 is a bit much. I run that 1405 with a Comp 260H and get 2mpg better than the old stock cam and 2 barrel motorcrap and yes I run a Performer.
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  #13  
Old 02-14-2005, 08:29 PM
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i heard about the sp2p...I got a used performer intake(yeah used woohoo same as new with veteran miles) and 1405 on my eddy I dont think i even need to mess with the jets the sob pulls like a raped ape.

is the throttle supposed to be this sensitive the old thing i used to have to push down a bit before it would react this one i could gun in quarter way and it start going crazy it kinda awsome.
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Old 02-14-2005, 10:47 PM
Am4wag Am4wag is offline
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2131 is avail.w/EGR in case you have emissions inspections in Mich.
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  #15  
Old 02-14-2005, 11:31 PM
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Quote:
Originally posted by AMX factor:
Flint put a Performer on your rig or I'll kick your butt when I come down for Ouray! I'm sure Krista will let me! I do think you need a bit smaller carb that 750 is a bit much. I run that 1405 with a Comp 260H and get 2mpg better than the old stock cam and 2 barrel motorcrap and yes I run a Performer.
Heh, I thought you'd chime in... Yeah, when I first got the AFB, thought it was a 600 or 625. The stock 360 was getting about 11. This 401 is getting 8.5234 mpg.

I have looked at a couple different Performer pix. Do they have the bolt hole for rear AC compressor (triangle shaped) bracket on passenger side of engine?

Waddaya think of the R4B?

[ February 15, 2005, 06:00 AM: Message edited by: Flint ]
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  #16  
Old 02-15-2005, 12:41 AM
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When I put the Performer on my 360 there were bolt holes for everything I needed-it appears to be a well engineered unit. It's been on there for at least 8 years so I really don't remember how much more "ummppphhh" it delivered. What I do remember is the wife after one drive saying "Why didn't you do this 4 years ago????" and she rarely notices anything about cars.
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Old 02-15-2005, 02:59 AM
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Has anyone tried the offy 360 degree it has the best of both worlds with the split runners on the dyno the offy made more torque than the performer and only slightly less hp(I have more detailed posting on another thread think it is"are all 360 cams the same" ) I would never buy another performer the gains over stock are not good enough. Go for the air gapper just look at the graph on that intake.
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  #18  
Old 02-15-2005, 03:22 AM
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Flint,

Yah, I feel the 750 is a tad large for your configuration.

I have noticed a considerable amount of performance increase with the SP2P and 625 Carter Comp Carb. I am happy with it's low and mid range response which is mainly where I run my engine.

I fell that any of these manifolds have a good recognizable performance increase.

You could try a smaller carb. I like 625 to 675CFM and a four hole spacer.

Ditto Carrotmans
Quote:
With smaller openings, the velocity of the mixture has to be greater in the SP2P. Under 4,000 RPM, velocity is more important than volume.
jeepsr4ever
Quote:
My opinion is that the sp2p is a great mantle and conversational piece but doesn’t belong on a motor
Anytime you get bored with that mantle piece, send it my way. I will mount it on a motor. And once I have it installed we can then have a conversation about it. This sounds more fun.

[ February 15, 2005, 11:55 AM: Message edited by: badaboom ]
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Old 02-15-2005, 03:59 AM
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  #20  
Old 02-15-2005, 03:50 PM
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Well AMX factor & jeeps4ever.....just won bid on a 2131 Performer on eBay. Be interesting to see what the difference is. Goin for it! Formulas I have run for a 401 indicate 600 CFM would be more like it too Badaboom. Especially at the altitudes we run here. I also have a line on a 625 AFB if it looks like the 750 is still too much carb after the Performer is installed. Thanks for the feedback y'all!
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76 401 Wag, 77 401 Wag, 77 401 J20
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