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post #1 of 28 (permalink) Old 09-19-2004, 10:33 AM Thread Starter
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So what do you guys think about these

Im thinking of buying the Stage 2 VT heads and a Accufab upper intake plenum. Not sure if I should go with a 75mm or 70 mm throttle body??.

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post #2 of 28 (permalink) Old 09-19-2004, 10:42 AM
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The Accufab on a pretty much stock motor has shown better power and torque gains with the 75mm. Check out MD, they did a test on them with the 70 and 75 on a Mustang with pretty much just headers and exhaust. With ported heads, you would see more of a gain with the 75mm than they did, I would think.
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post #3 of 28 (permalink) Old 09-19-2004, 10:49 AM
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Plenum combination....................CFM
-------------------------....................-----
Stock plenum only ('98-'00)........498
with stock 65MM TB....................441
with 70MM TB.............................491
with 75MM TB.............................488

Stock plenum only ('01 & up)......505
with stock 65MM TB....................460
with 70MM TB.............................488
with 75MM TB.............................491

Trick Flow plenum only...............616
with 70MM TB............................595
with 75MM TB............................593

C&L plenum only.......................569
with 70MM TB............................557
with 75MM TB............................597

Dragon plenum only...................664
with 70MM TB.............................611
with 75MM TB.............................619

Accufab 70MM plenum only........619
with 70MM TB.............................628
with 75MM TB.............................614

Accufab 75MM plenum only.........680
with 70MM TB.............................628
with 75MM TB.............................628

Taken from Fdawg97lx who took it from Modular Depot.

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post #4 of 28 (permalink) Old 09-19-2004, 11:11 AM Thread Starter
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Accufab 75MM plenum only.........680
with 70MM TB.............................628
with 75MM TB.............................628

so it says with a 75mm plenum and stock throttle body youll flow more air than with a 70 or 75 mm??? and they both flow the same??

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post #5 of 28 (permalink) Old 09-19-2004, 11:32 AM
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If that's what it says.....The numbers are a bit conflicting, but that's the post over at modular depot.

You can double check if you have time, I will but not till later

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post #6 of 28 (permalink) Old 09-19-2004, 11:33 AM
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flow numbers are just a guide, go look at the HP and torque differences.
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post #7 of 28 (permalink) Old 09-19-2004, 11:53 AM
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Here's two dyno prven articles.....Enjoy

MD Plenum Showdown 1

MD Plenum Showdown 2


400+ dollars for 8 rwhp, ehhhh, a bit expensive ya think?

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post #8 of 28 (permalink) Old 09-19-2004, 11:54 AM
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Quote:
Originally posted by Lazania
Accufab 75MM plenum only.........680
with 70MM TB.............................628
with 75MM TB.............................628

so it says with a 75mm plenum and stock throttle body youll flow more air than with a 70 or 75 mm??? and they both flow the same??
the plenum alone with no tb flows 680 cfm and with the 70mm and 75mm tb's it flows 628 cfm.

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post #9 of 28 (permalink) Old 09-19-2004, 04:45 PM Thread Starter
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Quote:
Originally posted by DMcBrideBoston
Here's two dyno prven articles.....Enjoy

MD Plenum Showdown 1

MD Plenum Showdown 2


400+ dollars for 8 rwhp, ehhhh, a bit expensive ya think?

Dave
I agree that is a bit pricey for $400.00 I probley wouldnt buy it now seeing the results are so little, but I wonder if it would maybe work better on a car with ported heads and different cams

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post #10 of 28 (permalink) Old 09-19-2004, 05:57 PM
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I am pretty sure it's safe to say YES.....

Dave

Everything works in conjunction as you know, The more you add the more you'll gain from other things already done.



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post #11 of 28 (permalink) Old 09-19-2004, 07:25 PM Thread Starter
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hey , did not to get off topic but did you ever have a Mark 8???, if so I think I sold you a 90mm Maf . Thanks for the charts. have any of you seen the P51 intake manifold it looks to be putting better numbers out of all of them

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post #12 of 28 (permalink) Old 09-19-2004, 08:24 PM
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No I never had a Mark 8, but I do want one

No I haven't seen the intake yet.

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post #13 of 28 (permalink) Old 09-20-2004, 12:16 AM
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i have a used accufab upper intake "plenum" for sale.. $190 + shipping.. w/ Dan outta commission temporarily, you can't beat that deal.. cheapest other price is $229 + s&h even on ebay

lemme know.. i think i can tell a diff.. oct2nd i'll let ya know when i get on the rollers again
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post #14 of 28 (permalink) Old 09-20-2004, 12:28 AM Thread Starter
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Ill keep that in mind but I want to find out more about this P51 intake and I wish some of the NA guys would pop up and let me know if these heads are worth the money.

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post #15 of 28 (permalink) Old 09-20-2004, 01:44 AM
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Quote:
Originally posted by Lazania
Accufab 75MM plenum only.........680
with 70MM TB.............................628
with 75MM TB.............................628

so it says with a 75mm plenum and stock throttle body youll flow more air than with a 70 or 75 mm??? and they both flow the same??
no that's the elbow by itself...no TB at all.




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post #16 of 28 (permalink) Old 09-20-2004, 09:23 AM
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i don't even think the P51 is available yet.. and if it is... costs almost as much as a damn blower heheh

you buying stage 2 NPI vt heads, or PI vt heads?
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post #17 of 28 (permalink) Old 09-20-2004, 09:39 AM
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There's a thread on here with ported NPIs and ported PIs and the NPIs out flow the PIs.

Waiting for the New heads to be a bit more reliable before I purchase a set. I currently have the Accufab Plenum and 70MM TB on my Bird and it helped. Buddy with his Mach1 won the TB at a drag race, so I got it pretty cheap.

Remember if you are getting more into it you have to have a way to get that more out of it also. That plenum and TB produce more air then the heads can use.

NA the 75mm wont gain you anything over the 70mm.

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post #18 of 28 (permalink) Old 09-20-2004, 05:40 PM Thread Starter
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whats not reliable about the VT heads and how much more do the non PI heads outflow the PI heads. I could get the NPI heads but I do have a PI block

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post #19 of 28 (permalink) Old 09-20-2004, 06:18 PM
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Do a search on the heads and you will find the info you are looking for. The PI Block? Which pistons do you have? If you have the T Bird flat pistons with PI heads you will get more compression. Do a search all the info you have asked about and much more is there.

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post #20 of 28 (permalink) Old 09-20-2004, 06:21 PM Thread Starter
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thanks

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post #21 of 28 (permalink) Old 09-20-2004, 06:23 PM
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He has an '02 Explorer engine. Why he'd even think about NPI heads I do not know, that would be rather *** backwards.

As far as $2k for P&P's heads, that's pretty much the norm I guess, and with some cams that would be a good idea. As long as their C&C program is up to par.

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post #22 of 28 (permalink) Old 09-20-2004, 06:28 PM Thread Starter
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Quote:
Originally posted by BlackCat94
He has an '02 Explorer engine. Why he'd even think about NPI heads I do not know, that would be rather *** backwards.

As far as $2k for P&P's heads, that's pretty much the norm I guess, and with some cams that would be a good idea. As long as their C&C program is up to par.
as they said up top NPI heads out flowed the PI heads in CFM, thats why it isnt *** backwards

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post #23 of 28 (permalink) Old 09-20-2004, 06:41 PM
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Quote:
Originally posted by Lazania

as they said up top NPI heads out flowed the PI heads in CFM, thats why it isnt *** backwards
You know how PI heads on an NPI shortblock will yield ~10.5:1 C/R? You are talking about the opposite situation here, the larger dish in the PI pistons combined with the larger volume of the CC in the NPI heads will yield a low compression ratio. Not sure if it will be that drastic of a difference, but it will be a low ratio. It, at best, won't be optimal for a N/A motor.

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post #24 of 28 (permalink) Old 09-20-2004, 06:42 PM Thread Starter
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thats what I was thinking it might do a reverse effect. I dont know the more I think about this engine in general makes me hate it more and more . I dont know what Im gonna do if anything.

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post #25 of 28 (permalink) Old 09-20-2004, 06:45 PM
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Quote:
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thats what I was thinking it might do a reverse effect. I dont know the more I think about this engine in general makes me hate it more and more . I dont know what Im gonna do if anything.
I'd just recommend you crunch some numbers and figure out what you're actually going to be looking at, it will certainly be lower than what it is now. If you don't like what you see, go with PI heads. I'd recommend the PI heads if you are leaving the shortblock as is.

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post #26 of 28 (permalink) Old 09-20-2004, 06:52 PM Thread Starter
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yeah I have PI heads right now, what numbers do you think I would see if I did the VT PI heads and cams???

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post #27 of 28 (permalink) Old 09-20-2004, 06:53 PM
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yea the differance in flow numbers isnt so drastic that i personally would choose one over the other. both are good. for your application i'd go with pi's because of the issue with compression being to low.

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post #28 of 28 (permalink) Old 09-20-2004, 07:49 PM Thread Starter
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yeah sounds like its mopre practical at this point, Im hoping I could do a high 12 sec pass with a good TC and heads.

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