11:1 Compression 402ci FI Results
11-13-2008, 12:52 PM
#21
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IMHO, I believe we will see the CR rise on factory FI cars in the years to come as more history builds on the reliability factor. We know a higher CR is more efficient at making more power and delivering better fuel economy. The direct injected, forced induction VVT vehicles will bring plenty to the table 
11-13-2008, 11:34 PM
#23
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The tuner called me today, they installed the KB BAP and it holds 60 psi all the way up to 7000 RPM with no problems. Injectors are at 80% and fuel seems ok for now. The weather will be turning very soon and I will look into some other upgrades through the season. He called me with the highest numbers he got and I think they were 66X rwhp/56X rwtq. I cant wait to drive it if I get some clear weather to do so....
11-20-2008, 02:02 PM
#25
Burning Brakes
you guys are too technical for me.
so can i blow my 11.5 to 1 408? forged motor, trickfow heads, comp cam. making 440 to the tires now on a mustang dyno.. car is set up for nitrous.
so can i blow my 11.5 to 1 408? forged motor, trickfow heads, comp cam. making 440 to the tires now on a mustang dyno.. car is set up for nitrous.
11-20-2008, 02:30 PM
#26
Tech Contributor
You can with low boost. Based on the article above, you still have the quench to contend with. Not sure if you can just buy thicker head gaskets to kill the quench or if it requires some special machining. Of course if you buy thicker head gaskets, you'll be lowering your compression too. Run low boost and spray. I am considering that very thing on a daily basis.
11-21-2008, 03:27 PM
#27
Drifting
This thread makes my current upgrade sound that much better to me now!!
TT 427 with 11.8CR. It makes over 550rwhp-(on a dynojet-would be lower on a mustang dyno) I can t wait to GET ER DONE!! Im only wanting to make 800rwhp(dynojet) with it but i really can t imagine having much more power than it already has cause, even with slipping clutch issues(i have a new Spec 3+ to install, with a Spec alum flywheel) It will smoke the tires at highway speeds and pulls towards 200mph very fast! Im dropping to a 3.15 gear to change things a little(from the previous 4.10 and the now 3.42) With gobs of power, why would i even want low(numerically high) gears, just to smoke the tires instead of accelerating? This thread was a GREAT read!
- Jason
TT 427 with 11.8CR. It makes over 550rwhp-(on a dynojet-would be lower on a mustang dyno) I can t wait to GET ER DONE!! Im only wanting to make 800rwhp(dynojet) with it but i really can t imagine having much more power than it already has cause, even with slipping clutch issues(i have a new Spec 3+ to install, with a Spec alum flywheel) It will smoke the tires at highway speeds and pulls towards 200mph very fast! Im dropping to a 3.15 gear to change things a little(from the previous 4.10 and the now 3.42) With gobs of power, why would i even want low(numerically high) gears, just to smoke the tires instead of accelerating? This thread was a GREAT read!- Jason
11-23-2008, 02:15 PM
#28
Melting Slicks
I agree. This really good reading. I have been 8.5 compression on a previous 402 setup with a turbo(PT 88) in my Fbody. The gas milage suxed. Made 760rwh but due to the low CR spooling the turbo took a bit. IMO my new setup to me is better. Higher compression and less boost. My next stroker with my Kene Bell will most likely be atleast 10.1.
03-20-2009, 09:13 AM
#31
that should make a grate road race engine!
less presure means less heat in the intake air. this puts less stress on the intercoolers so the smaller twin coolers could still be used and classed as efficent. brillient throttle responce no matter what rpm and what the SC is doing.
also have you guys not noticed that most people say 9.5-1 is a good comp. ratio for SC cars no??? this has changed from a few years ago when people REALLY wanted low comp just cos they where running a few pounds. its probalby down tothe fact that tuners are SOOO mcuh better these days. they just know how to get the best from thee engines!
by the way, isn't Mr.BIG running nearly 800bhp from his stock bottom end LS2??
cheers
Chris.
less presure means less heat in the intake air. this puts less stress on the intercoolers so the smaller twin coolers could still be used and classed as efficent. brillient throttle responce no matter what rpm and what the SC is doing.
also have you guys not noticed that most people say 9.5-1 is a good comp. ratio for SC cars no??? this has changed from a few years ago when people REALLY wanted low comp just cos they where running a few pounds. its probalby down tothe fact that tuners are SOOO mcuh better these days. they just know how to get the best from thee engines!
by the way, isn't Mr.BIG running nearly 800bhp from his stock bottom end LS2??
cheers
Chris.
03-21-2009, 01:01 AM
#32
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that should make a grate road race engine!
less presure means less heat in the intake air. this puts less stress on the intercoolers so the smaller twin coolers could still be used and classed as efficent. brillient throttle responce no matter what rpm and what the SC is doing.
also have you guys not noticed that most people say 9.5-1 is a good comp. ratio for SC cars no??? this has changed from a few years ago when people REALLY wanted low comp just cos they where running a few pounds. its probalby down tothe fact that tuners are SOOO mcuh better these days. they just know how to get the best from thee engines!
by the way, isn't Mr.BIG running nearly 800bhp from his stock bottom end LS2??
cheers
Chris.
less presure means less heat in the intake air. this puts less stress on the intercoolers so the smaller twin coolers could still be used and classed as efficent. brillient throttle responce no matter what rpm and what the SC is doing.
also have you guys not noticed that most people say 9.5-1 is a good comp. ratio for SC cars no??? this has changed from a few years ago when people REALLY wanted low comp just cos they where running a few pounds. its probalby down tothe fact that tuners are SOOO mcuh better these days. they just know how to get the best from thee engines!
by the way, isn't Mr.BIG running nearly 800bhp from his stock bottom end LS2??
cheers
Chris.
03-24-2009, 09:27 AM
#33
03-24-2009, 10:21 AM
#34
Thanks for all the feedback guys. I have run superchargers on several other vehicles I own and have owned in the past. I ran the high compression N/A engine because thats what Dave had. I had the oppertunity to get a brand new Procharger at a deal and jumped on it. I will also be able to get rid of my HSW plate and several other NOS related components that I had on my car. I sold my Tony Mamo ported FAST 90, sold my stock LS2 90 TB, and that paid for over half the price I got the blower for. Once I sell all the NOS items the blower would be paid for by the parts I removed 
Over 140 RWHP more by swapping some parts.
Over 140 RWHP more by swapping some parts.Last edited by 98vettedave; 03-24-2009 at 10:31 AM.
03-31-2009, 07:15 PM
#36
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The 140 HP increase was compared to "N/A" No Mustang Dyno Numbers were with the Nitrous....
