What is biggest restriction on stock intake?

1897 Views 16 Replies 7 Participants Last post by Iwannagofast, Nov 19, 2009

chrisbmx

Discussion Starter · Oct 18, 2009

I am looking to setup some mods in the next couple of years. I have an 87 Speed density with 5 speed, 3.73, diff rebuild with kevlar clutches, flowmaster 2.5 catback, Pro 5.0 shifter, 2 row alum radiator, K&N, free power mods. I plan on adding some headers and an X-pipe first and eventually want to be low 12's car with no nitrous or slicks in a few years, maybe drag radials. I am looking at AFR 185's, intake tbd, maybe cam, fuel pump & injectors after exhaust and intake.

What is the biggest restriction in the intake tract?
Is it the throttle body, intake itself, or what?
What should I do to achieve my goal?
I do have the intake silencer removed in the wheel well.

Thank you for any opinion you have. I am inexperienced and any help would be greatly appreciated!!

1 - 17 of 17 Posts

mxnate116

· #2 · Oct 18, 2009

the lower intake runners are the biggest restriction ive read. i tried to find the tmoss porting website but its no longer around, hes part of this forum you could PM him for more info, he will tell you whats what on the stock intake

JBIGBOOTSY

· #3 · Oct 18, 2009

#1,and #5 lover intake runners. Flow in the 150s. The others flow almost 200.

mpe331lx

· #4 · Oct 19, 2009

You will need to flycut the pistons to run the AFR185's. if you are not planning on changing pistons and do not want to deal with flycutting the stock ones, go with a set of TFS TW heads that have been ported by a repuatble shop like TEA, Fox Lake, ETC.

I'm pretty sure TFS now offers a CNC head out of the box, but they may be a little large for your intended combo.

tmoss

· #5 · Oct 19, 2009 (Edited)

The whole lower needs to be ported and the bolt pinch in the throttle body inlet needs to be opened, then a good gasket match of upper to lower. It will wind up flowing 200-210cfm if done right, same as a stock Cobra. If you have the tools and skills, you can do it your self by following my article in the tech section here:

EECTuning.org • Index page

problem got resolved.

Reactions: 1

e3sean

· #6 · Oct 19, 2009

hey man you need to come around more oftan or do you just kinda sit back and read?

tmoss

· #7 · Oct 19, 2009

I'm here more often than you think, just don't post up that much - only if I can contribute beyond what's been said already.

tmoss

· #8 · Oct 20, 2009

link above now works

chrisbmx

Discussion Starter · #9 · Oct 21, 2009

chrisbmx said:
I am looking to setup some mods in the next couple of years. I have an 87 Speed density with 5 speed, 3.73, diff rebuild with kevlar clutches, flowmaster 2.5 catback, Pro 5.0 shifter, 2 row alum radiator, K&N, free power mods. I plan on adding some headers and an X-pipe first and eventually want to be low 12's car with no nitrous or slicks in a few years, maybe drag radials. I am looking at AFR 185's, intake tbd, maybe cam, fuel pump & injectors after exhaust and intake.

I think I may go with the twisted wedge heads instead of the AFR's since I don't want to get into fly-cutting pistons or changing them like mpe331lx noted. Will this combo most likely get me to my goal? What does mpe331lx mean when he says ported twisted wedge heads may be "too large for my intended combination"? Any other suggestions? Thanks

chrisbmx

Discussion Starter · #10 · Nov 18, 2009

What about the other restrictions? Between a K&N panel filter, 55mm MAF, a stock throttle body, stock EGR spacer, stock intake, and stock heads, which one is the bottleneck, the intake? Which would be the list from most restrictive to least restrictive?:banana

tmoss

· #11 · Nov 19, 2009

change the 55mm MAF out for a 94-95 70mm MAF (cheap) and the K&N panel filter first. After that, port the lower intake or switch to a Explorer intake with the internal EGR passages like the stock intake. You'll also have to drill/tap the ACT and EGR coolant return lines in the Explorer lower or move the ACT to the plastic cold air intake and block off the water to the EGR spacer.

chrisbmx

Discussion Starter · #12 · Nov 19, 2009

Where is the best place to get a 94-95 70mm MAF? Are they cal'd to 19 or 24# injectors? How cheap?
Should I change the panel K&N to the conical type?
Thanks TMOSS :3gears

tmoss

· #13 · Nov 19, 2009

yes, the 94-95 MAFs are calibrated for 19# injectors. Use a K&N panel filter in the stock cold air intake. You can get them real cheap if you look - lot's of them have been removed in upgrades.

Iwannagofast

· #14 · Nov 19, 2009

the heads really are what is holding you back

tmoss

· #15 · Nov 19, 2009

intake is most restrictive, then the heads..........

chrisbmx

Discussion Starter · #16 · Nov 19, 2009

I have the K&N panel filter already. Will the 94/95 MAF swap out with the stock 55mm with no changes in anything else (wiring changes)? Do I need an electrical connector from the 94/95 also or just the MAF? How much power will it support (I guess what I'm asking is when/will I have to upgrade to a bigger MAF)?

The explorer intake: Which year explorer do I get this off of? Is there a special kind of intake or certain explorers I need to look for? Is the intake gasket a direct match to the stock 5.0 intake? If it is, can I get either intake gasket and expect it to work?

Iwannagofast

· #17 · Nov 19, 2009

tmoss said:
intake is most restrictive, then the heads..........

im sure your right....but basically you can replace either or in this case but if you just replace one of them its not gonna get you very far

1 - 17 of 17 Posts

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