how high of compression is too high for FI?

will2045 · October 12th, 2011, 01:34 AM

what the title says my motor specs are in my garage. bottom line is its roughly 11:1 compression and i REALLY want more power. so is it realistic on this motor? even at a low psi?

SWEET2KSTANG · October 12th, 2011, 01:40 AM

yes, low boost is just fine and easily doable. low end tq will be favorable because of higher comperssion. you will be limited to about 8psi or so depending on tuner and fuel.

Nitmare67 · October 12th, 2011, 01:41 AM

Depends on the camshaft used. Dynamic compression is what REALLY matters in these situations.

will2045 · October 12th, 2011, 01:41 AM

Originally Posted by SWEET2KSTANG

yes, low boost is just fine and easily doable. low end tq will be favorable because of higher comperssion. you will be limited to about 8psi or so depending on tuner and fuel.

so I have never built a FI car before. looking at my garage and knowing im only looking for a max of 8psi what would you suggest a route to research for FI? and what kind of power would i be looking at? (obviously rough estimate)

SWEET2KSTANG · October 12th, 2011, 01:47 AM

with that big of an n/a cam, a good intake, i would look into a centri myself.

Nitmare67 · October 12th, 2011, 01:49 AM

Without a doubt big centri. With that cam a KB isnt really even an option. Thats honestly even too much for a centri but with the right cam selection you could run over 12lbs on pump gas.

SWEET2KSTANG · October 12th, 2011, 01:52 AM

^

SWEET2KSTANG · October 12th, 2011, 01:53 AM

but i was also talking about no cam change as well. it comes down to how much $$$ he is willing to spend. stg 5 cam has lot of overlap, so dynamic compression shouldnt be too bad.

Nitmare67 · October 12th, 2011, 01:56 AM

Compression is probably in the hole bad honestly. He could always sell the cams and shop for some used stage 3 CMS blower cams or something else common to the market. The right blower cam wont drop much boost but it will drop the cylinder pressure. From what I've seen most guys running CMS 2 and 3 blower cams lose zero boost lol.

will2045 · October 12th, 2011, 01:57 AM

im willing to spend what its worth if that makes sense. i mean if im going to boost the car and only gain 100rwhp then its not worth it but if im looking at like 200rwhp by the time im done i may very well be interested in spending the money. i'd like to not modify more tan it is currently. if possible to just change my pump, injectors, and strap on a blower of some sort then id like to do that.

SWEET2KSTANG · October 12th, 2011, 01:57 AM

havent followed up on cms cams, i personally not a fan of their 2v cams. i do like some of the 4v grinds selections, but i personally still run with bullett pieces.

SWEET2KSTANG · October 12th, 2011, 01:59 AM

Originally Posted by will2045

im willing to spend what its worth if that makes sense. i mean if im going to boost the car and only gain 100rwhp then its not worth it but if im looking at like 200rwhp by the time im done i may very well be interested in spending the money. i'd like to not modify more tan it is currently. if possible to just change my pump, injectors, and strap on a blower of some sort then id like to do that.

your power/tq will shift and change with the cams. heads, cams, intake is whats going to determine the end result. you can strap boost on it now and get good gains. but a simple cam swap itself along with required tune can make 60+rwhp difference with no other changes on boost alone.

Nitmare67 · October 12th, 2011, 02:01 AM

To each their own. I've always like Jims cams but its like all things there are better and others out there. Any off the shelf cam is a sacrifice in performance really. MHS has some great grinds out there and honestly more choices than probably anyone else. Most cams for 2vs are ground by Bullet - CMS and MHS is to name a few.

will2045 · October 12th, 2011, 02:03 AM

Originally Posted by SWEET2KSTANG

your power/tq will shift and change with the cams. heads, cams, intake is whats going to determine the end result. you can strap boost on it now and get good gains. but a simple cam swap itself along with required tune can make 60+rwhp difference with no other changes on boost alone.

slightly confused, are you saying i can pick up 60+rwhp as i am right now n/a with a different cam and tune? im on a dyno tune with stage 5 cams. or if i just strap a blower and new cams and tune ill make 60 more rwhp? thats nothing compared to the price..

Nitmare67 · October 12th, 2011, 02:09 AM

Hes saying that switching from those cams to a blower specific grind for your motor will yield probably another 50+ rwhp gain.

Nitmare67 · October 12th, 2011, 02:10 AM

With your standard 9-10lbs kit you will probably gain 100+ rwhp even with those cams. Switch to a good large blower grind and it will really rip.

will2045 · October 12th, 2011, 02:11 AM

Originally Posted by Nitmare67

Hes saying that switching from those cams to a blower specific grind for your motor will yield probably another 50+ rwhp gain.

alright thanks lol sorry i guess im tired 2am in Mi. well i guess ive got some food for thought. ive always been told my motor was way to high a compression for any FI

October 12th, 2011, 01:34 AM	#1
will2045 Enthusiast 2000 Mustang GT 13.3 @107 2.1 on street tires Join Date: Dec 2009 Location: MSU, Mi Posts: 951 iTrader: 1 reviews	how high of compression is too high for FI? what the title says my motor specs are in my garage. bottom line is its roughly 11:1 compression and i REALLY want more power. so is it realistic on this motor? even at a low psi? __________________ BUY MY CAR!!! http://www.moddedmustangs.com/forums...0-mustang.html

October 12th, 2011, 01:40 AM	#2
SWEET2KSTANG mm's nitrous mod 2000 mustang gt 11.79@115.83 (old set up) Join Date: Oct 2006 Location: N.W. AR Posts: 12,540 iTrader: 8 reviews	yes, low boost is just fine and easily doable. low end tq will be favorable because of higher comperssion. you will be limited to about 8psi or so depending on tuner and fuel. __________________ project warhorse under construction wagon burner under construction as well (04 lightning) being built by MP2 Performance

October 12th, 2011, 01:41 AM	#3
Nitmare67 Hardcore Enthusiast Join Date: Feb 2010 Posts: 1,391 iTrader: 0 reviews	Depends on the camshaft used. Dynamic compression is what REALLY matters in these situations. __________________ 99 Mustang GT 446rwhp, Vortech Aftercooled, Killer Chiller @12lbs, HPX, 3.73s, MGW, Battery Relocation, Intercooler Tank Relocated, CF DF clutch, Steeda Quick Release Quadrant, 75mm TB, Ported C&L Plenum, Stock PI Cams Advance 4 degrees, Pro Chamber

October 12th, 2011, 01:47 AM	#5
SWEET2KSTANG mm's nitrous mod 2000 mustang gt 11.79@115.83 (old set up) Join Date: Oct 2006 Location: N.W. AR Posts: 12,540 iTrader: 8 reviews	with that big of an n/a cam, a good intake, i would look into a centri myself. __________________ project warhorse under construction wagon burner under construction as well (04 lightning) being built by MP2 Performance

October 12th, 2011, 01:49 AM	#6
Nitmare67 Hardcore Enthusiast Join Date: Feb 2010 Posts: 1,391 iTrader: 0 reviews	Without a doubt big centri. With that cam a KB isnt really even an option. Thats honestly even too much for a centri but with the right cam selection you could run over 12lbs on pump gas. __________________ 99 Mustang GT 446rwhp, Vortech Aftercooled, Killer Chiller @12lbs, HPX, 3.73s, MGW, Battery Relocation, Intercooler Tank Relocated, CF DF clutch, Steeda Quick Release Quadrant, 75mm TB, Ported C&L Plenum, Stock PI Cams Advance 4 degrees, Pro Chamber

October 12th, 2011, 01:52 AM	#7
SWEET2KSTANG mm's nitrous mod 2000 mustang gt 11.79@115.83 (old set up) Join Date: Oct 2006 Location: N.W. AR Posts: 12,540 iTrader: 8 reviews	^ __________________ project warhorse under construction wagon burner under construction as well (04 lightning) being built by MP2 Performance

October 12th, 2011, 01:53 AM	#8
SWEET2KSTANG mm's nitrous mod 2000 mustang gt 11.79@115.83 (old set up) Join Date: Oct 2006 Location: N.W. AR Posts: 12,540 iTrader: 8 reviews	but i was also talking about no cam change as well. it comes down to how much $$$ he is willing to spend. stg 5 cam has lot of overlap, so dynamic compression shouldnt be too bad. __________________ project warhorse under construction wagon burner under construction as well (04 lightning) being built by MP2 Performance

October 12th, 2011, 01:56 AM	#9
Nitmare67 Hardcore Enthusiast Join Date: Feb 2010 Posts: 1,391 iTrader: 0 reviews	Compression is probably in the hole bad honestly. He could always sell the cams and shop for some used stage 3 CMS blower cams or something else common to the market. The right blower cam wont drop much boost but it will drop the cylinder pressure. From what I've seen most guys running CMS 2 and 3 blower cams lose zero boost lol. __________________ 99 Mustang GT 446rwhp, Vortech Aftercooled, Killer Chiller @12lbs, HPX, 3.73s, MGW, Battery Relocation, Intercooler Tank Relocated, CF DF clutch, Steeda Quick Release Quadrant, 75mm TB, Ported C&L Plenum, Stock PI Cams Advance 4 degrees, Pro Chamber

October 12th, 2011, 01:57 AM	#10
will2045 Enthusiast 2000 Mustang GT 13.3 @107 2.1 on street tires Join Date: Dec 2009 Location: MSU, Mi Posts: 951 iTrader: 1 reviews	im willing to spend what its worth if that makes sense. i mean if im going to boost the car and only gain 100rwhp then its not worth it but if im looking at like 200rwhp by the time im done i may very well be interested in spending the money. i'd like to not modify more tan it is currently. if possible to just change my pump, injectors, and strap on a blower of some sort then id like to do that. __________________ BUY MY CAR!!! http://www.moddedmustangs.com/forums...0-mustang.html

October 12th, 2011, 02:01 AM	#13
Nitmare67 Hardcore Enthusiast Join Date: Feb 2010 Posts: 1,391 iTrader: 0 reviews	To each their own. I've always like Jims cams but its like all things there are better and others out there. Any off the shelf cam is a sacrifice in performance really. MHS has some great grinds out there and honestly more choices than probably anyone else. Most cams for 2vs are ground by Bullet - CMS and MHS is to name a few. __________________ 99 Mustang GT 446rwhp, Vortech Aftercooled, Killer Chiller @12lbs, HPX, 3.73s, MGW, Battery Relocation, Intercooler Tank Relocated, CF DF clutch, Steeda Quick Release Quadrant, 75mm TB, Ported C&L Plenum, Stock PI Cams Advance 4 degrees, Pro Chamber

October 12th, 2011, 02:09 AM	#15
Nitmare67 Hardcore Enthusiast Join Date: Feb 2010 Posts: 1,391 iTrader: 0 reviews	Hes saying that switching from those cams to a blower specific grind for your motor will yield probably another 50+ rwhp gain. __________________ 99 Mustang GT 446rwhp, Vortech Aftercooled, Killer Chiller @12lbs, HPX, 3.73s, MGW, Battery Relocation, Intercooler Tank Relocated, CF DF clutch, Steeda Quick Release Quadrant, 75mm TB, Ported C&L Plenum, Stock PI Cams Advance 4 degrees, Pro Chamber

October 12th, 2011, 02:10 AM	#16
Nitmare67 Hardcore Enthusiast Join Date: Feb 2010 Posts: 1,391 iTrader: 0 reviews	With your standard 9-10lbs kit you will probably gain 100+ rwhp even with those cams. Switch to a good large blower grind and it will really rip. __________________ 99 Mustang GT 446rwhp, Vortech Aftercooled, Killer Chiller @12lbs, HPX, 3.73s, MGW, Battery Relocation, Intercooler Tank Relocated, CF DF clutch, Steeda Quick Release Quadrant, 75mm TB, Ported C&L Plenum, Stock PI Cams Advance 4 degrees, Pro Chamber

Remove Advertisements Sponsored Links
Ford Mustang Forum Advertisement

Threads Similar to: how high of compression is too high for FI?
Thread	Thread Starter	Forum	Replies	Last Post
High compression help	jme30426	96-98	34	October 7th, 2011 10:26 AM
high or low compression help	mustang95 5.0	V6 Mustangs	6	February 7th, 2010 11:48 PM
High compression or Low?	MaroonNotchback408	5.0 Mustangs	13	April 22nd, 2009 04:20 PM
High Compression and DD	MyGT	99-04	15	December 5th, 2008 04:59 PM
High vs. Low Compression	87StangLX	General Tech	14	November 17th, 2007 10:42 PM

All times are GMT -4. The time now is 05:21 PM.
Contact Us - Modded Mustangs : Ford Mustang Forums - Privacy Statement - Top
Modded Mustangs is ©2005-2008, All Rights Reserved, And is Not Affiliated with Ford Motor Company. Forum is powered by vBulletin ©2000 - 2012, Jelsoft Ent. Ltd. & SEO by vBSEO 3.3.2 ©2009, Crawlability, Inc.