What is biggest restriction on stock intake?

chrisbmx · October 18th, 2009, 07:15 PM

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!!

mxnate116 · October 18th, 2009, 07:29 PM

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 · October 18th, 2009, 07:50 PM

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

mpe331lx · October 19th, 2009, 01:32 AM

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 · October 19th, 2009, 11:17 AM

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.

e3sean · October 19th, 2009, 12:57 PM

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

tmoss · October 19th, 2009, 01:06 PM

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 · October 20th, 2009, 09:25 AM

link above now works

chrisbmx · October 21st, 2009, 06:10 PM

[quote=chrisbmx;2364206]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 · November 18th, 2009, 06:41 PM

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?

tmoss · November 18th, 2009, 07:03 PM

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 · November 18th, 2009, 07:17 PM

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

tmoss · November 19th, 2009, 01:28 PM

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 · November 19th, 2009, 04:20 PM

the heads really are what is holding you back

tmoss · November 19th, 2009, 04:27 PM

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

chrisbmx · November 19th, 2009, 04:53 PM

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 · November 19th, 2009, 04:55 PM

Originally Posted by tmoss

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

October 18th, 2009, 07:29 PM	#2
mxnate116 Hardcore Enthusiast 88 mustang GT Join Date: Jun 2007 Location: Spokane, WA Posts: 1,076	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 __________________

October 18th, 2009, 07:50 PM	#3
JBIGBOOTSY MM Fanatic 1990 LX hatch Join Date: Aug 2006 Location: Hobart Indiana Posts: 3,587	#1,and #5 lover intake runners. Flow in the 150s. The others flow almost 200. __________________ Bolt-on Abraham Lincoln Log motor. With extra wiring.

October 19th, 2009, 01:32 AM	#4
mpe331lx Regular 96 Cobra 9.93@142 Join Date: Dec 2008 Location: SWFL Posts: 294	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. __________________ 97 Camaro: Beating up LS1's and 4.6's with a mild LT1

October 19th, 2009, 12:57 PM	#6
e3sean MM Fanatic 1988 lx stock block 10.47@128 125shot Join Date: Nov 2007 Location: arizona Posts: 4,764	hey man you need to come around more oftan or do you just kinda sit back and read? __________________ MILITARY CREW USAF LUKE AFB AZ, E-5

October 19th, 2009, 01:06 PM	#7
tmoss Regular Join Date: Jan 2007 Location: St Louis, Mo Posts: 275	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. __________________ 88 GT Vert 5spd, 3:73 gears, Explorer intake/65mm TB, Explorer Ps, Manley race 1.85/1.55 valves, 1.7/1.6 stud rockers, stock cam +4 degrees, MAC Jet-Hot coated shorties. 277RWHP/330RWTQ

October 18th, 2009, 07:15 PM	#1
chrisbmx Newbie 1987 GT Guessing high 13's Join Date: Oct 2009 Location: PA Posts: 37	What is biggest restriction on stock intake? 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!!

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October 19th, 2009, 11:17 AM	#5
tmoss Regular Join Date: Jan 2007 Location: St Louis, Mo Posts: 275	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. __________________ 88 GT Vert 5spd, 3:73 gears, Explorer intake/65mm TB, Explorer Ps, Manley race 1.85/1.55 valves, 1.7/1.6 stud rockers, stock cam +4 degrees, MAC Jet-Hot coated shorties. 277RWHP/330RWTQ Last edited by tmoss : October 20th, 2009 at 09:24 AM.

October 20th, 2009, 09:25 AM	#8
tmoss Regular Join Date: Jan 2007 Location: St Louis, Mo Posts: 275	link above now works __________________ 88 GT Vert 5spd, 3:73 gears, Explorer intake/65mm TB, Explorer Ps, Manley race 1.85/1.55 valves, 1.7/1.6 stud rockers, stock cam +4 degrees, MAC Jet-Hot coated shorties. 277RWHP/330RWTQ

October 21st, 2009, 06:10 PM	#9
chrisbmx Newbie 1987 GT Guessing high 13's Join Date: Oct 2009 Location: PA Posts: 37	[quote=chrisbmx;2364206]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

November 18th, 2009, 06:41 PM	#10
chrisbmx Newbie 1987 GT Guessing high 13's Join Date: Oct 2009 Location: PA Posts: 37	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?

November 18th, 2009, 07:03 PM	#11
tmoss Regular Join Date: Jan 2007 Location: St Louis, Mo Posts: 275	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. __________________ 88 GT Vert 5spd, 3:73 gears, Explorer intake/65mm TB, Explorer Ps, Manley race 1.85/1.55 valves, 1.7/1.6 stud rockers, stock cam +4 degrees, MAC Jet-Hot coated shorties. 277RWHP/330RWTQ

November 18th, 2009, 07:17 PM	#12
chrisbmx Newbie 1987 GT Guessing high 13's Join Date: Oct 2009 Location: PA Posts: 37	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

November 19th, 2009, 01:28 PM	#13
tmoss Regular Join Date: Jan 2007 Location: St Louis, Mo Posts: 275	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. __________________ 88 GT Vert 5spd, 3:73 gears, Explorer intake/65mm TB, Explorer Ps, Manley race 1.85/1.55 valves, 1.7/1.6 stud rockers, stock cam +4 degrees, MAC Jet-Hot coated shorties. 277RWHP/330RWTQ

November 19th, 2009, 04:27 PM	#15
tmoss Regular Join Date: Jan 2007 Location: St Louis, Mo Posts: 275	intake is most restrictive, then the heads.......... __________________ 88 GT Vert 5spd, 3:73 gears, Explorer intake/65mm TB, Explorer Ps, Manley race 1.85/1.55 valves, 1.7/1.6 stud rockers, stock cam +4 degrees, MAC Jet-Hot coated shorties. 277RWHP/330RWTQ

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November 19th, 2009, 04:53 PM	#16
chrisbmx Newbie 1987 GT Guessing high 13's Join Date: Oct 2009 Location: PA Posts: 37	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?