boost going 70 mph

huggy bear · November 4th, 2009, 10:09 PM

When I am going 70-75 mph I am about 2500 roughly. I looked on the kenne bell website and the boost starts a 2K so my question is what kind of boost will I be at going those speeds? I know the KB 2.1 has a flat torque/hp curve so I can assume that I will be at 9psi through out the whole rpm band?? the reaon I ask is because town driving I can keep the car under 2K to keep it out of boost to prolong the life of the s/c and my motor but at those speeds I would be worried that I will be running uneeded boost that will just wear out my motor. I googled and searched the forum for about 30 minutes and couldn't find anything. I may have not typed the right thing in the search so if anyone could help with any of these issues that would be fantastic.

HMUSN · November 4th, 2009, 10:12 PM

depends on too many variables. What gear are you going to be in? What kind of gears do you have? normal driving doesn't really create enough boost if any to do any damage.

mounder27 · November 4th, 2009, 10:12 PM

you dont see boost it will be vacum, if the throddle is being mashed you should see 9 lbs of boost all the way through the rpm

huggy bear · November 4th, 2009, 10:16 PM

I will have what ever gear is stock I think its 3.27's right?? ill be in 5th gear.

limited · November 4th, 2009, 10:55 PM

it goes by throttle postion more than rpm. the bypass closes around 4 or 5" vacuum. You can turn 4000 rpm and still not be in boost. at 2000 rpm cruise and steady throttle, i am around 15" vacuum,push throttle to halfway point I am at around 5 psi boost. Floor it and I am at full boost instantly

huggy bear · November 4th, 2009, 10:57 PM

Awesome! what vacuum are you talking about though, sorry for my retardation.

RyanGT · November 5th, 2009, 12:49 AM

Your engine creates a vacuum... you know all those hoses that have a vacuum. Anyways like mentioned it is vacuum that decides boost. like limited said you could be at 5k and tapping on pedal and wont be in boost. Or you can mash it at 2k and be at full boost.

huggy bear · November 5th, 2009, 08:43 AM

gotcha! also to add to my boost questions.. as long as I stay out of boost a reasonable amount of time I wont be hurt on fuel mileage right? also I have 91K fro miles should I be fine to run a 2.1 KB as long as I stay out of boost a good of amount of time I drive?

LAWNDART02 · November 5th, 2009, 09:14 AM

Check out the FAQ'a on the KB website
Kenne Bell Web Home
There is a ton of useful info about the 2.1L SC for our 4.6 GTs..

"Safety" can be a relative term. Weather or not you use an innercooler, how much Boost are you pullied for, condition of the fuel system, etc.. But most will agree the biggest factor is the tune.

Check out the website- Lots of info to help with your project.

wishIhada5.0 · November 5th, 2009, 10:35 AM

+1 you shouldnt be in boost if your accelerating normally or cruising along....when you mat the gas thats when all hell breaks loose lol

1FastFox · November 5th, 2009, 10:41 AM

+1 to these guys.. You wont be boosting at you not at WOT. DOnt you have a boost guage?

wishIhada5.0 · November 5th, 2009, 10:45 AM

I think the OP is debating on whether or not to go FI and just has some general questions...so as of right now he probably doesnt have a gauge lol OP...if you have any KB questions feel free to PM me...I was on your quest for knowledge about these blowers for a while too....lol

limited · November 5th, 2009, 12:59 PM

Originally Posted by 1FastFox

+1 to these guys.. You wont be boosting at you not at WOT.

This not true with a KB, If i stab the throttle to half, I will see ~5psi. I can control the boost I see instantly by throttle postion and speed at which the pedal gets there

LAWNDART02 · November 5th, 2009, 01:37 PM

BTW-
I've been wondering what it does if you downshift into a higher RPM?
Does it surge or anything?

330CubeGt · November 5th, 2009, 02:09 PM

Originally Posted by HMUSN

depends on too many variables. What gear are you going to be in? What kind of gears do you have? normal driving doesn't really create enough boost if any to do any damage.

What? I thought you were gone?

03_StangGuy · November 5th, 2009, 02:38 PM

Originally Posted by LAWNDART02

BTW-
I've been wondering what it does if you downshift into a higher RPM?
Does it surge or anything?

IT wont surge, If you loading the engine as your goin into the lower gear youll have boost that will go right into the engine. if not the bypass/bov will be open releasing the air. Unless your power shifting the bypass/bov will be open during the shift/while off throttle and wont close til you hit the gas and load the engine.

1FastFox · November 5th, 2009, 02:48 PM

Originally Posted by limited

This not true with a KB, If i stab the throttle to half, I will see ~5psi. I can control the boost I see instantly by throttle postion and speed at which the pedal gets there

Thats not how mine was... Maybe your pedal is adjusted different than mine, but mine didnt have any boost until the pedal was at the floor.

huggy bear · November 5th, 2009, 02:58 PM

Nice avatar^

limited · November 5th, 2009, 03:05 PM

Originally Posted by 1FastFox

Thats not how mine was... Maybe your pedal is adjusted different than mine, but mine didnt have any boost until the pedal was at the floor.

pedal adj. has nothing to do with it lol,you had problems, all KB's and pd type blowers behave the way I described

RyanGT · November 5th, 2009, 06:16 PM

Ya i start getting boost at like 1/4, don't get full boost till about 3/4-WOT at the throttle position. At about half im at 10psi. Wot 15.5 or so.

November 4th, 2009, 10:09 PM	#1
huggy bear Enthusiast 2001 Mustang GT .23333333 minutes Join Date: Aug 2009 Location: Inbetween a rock and a hard place Posts: 505	boost going 70 mph When I am going 70-75 mph I am about 2500 roughly. I looked on the kenne bell website and the boost starts a 2K so my question is what kind of boost will I be at going those speeds? I know the KB 2.1 has a flat torque/hp curve so I can assume that I will be at 9psi through out the whole rpm band?? the reaon I ask is because town driving I can keep the car under 2K to keep it out of boost to prolong the life of the s/c and my motor but at those speeds I would be worried that I will be running uneeded boost that will just wear out my motor. I googled and searched the forum for about 30 minutes and couldn't find anything. I may have not typed the right thing in the search so if anyone could help with any of these issues that would be fantastic. __________________ 2001 Mustang GT: 10.5 bullit rims, straight pipes, 180 degree t-stat, rear upper control arms, power slot rotors, hawk pads. fml

November 4th, 2009, 10:12 PM	#3
mounder27 Regular 02 mustang gt 7.64 @ 95 mph Join Date: Sep 2007 Location: san diego,ca Posts: 485	you dont see boost it will be vacum, if the throddle is being mashed you should see 9 lbs of boost all the way through the rpm __________________ www.wmdracing.net

November 4th, 2009, 10:16 PM	#4
huggy bear Enthusiast 2001 Mustang GT .23333333 minutes Join Date: Aug 2009 Location: Inbetween a rock and a hard place Posts: 505	I will have what ever gear is stock I think its 3.27's right?? ill be in 5th gear. __________________ 2001 Mustang GT: 10.5 bullit rims, straight pipes, 180 degree t-stat, rear upper control arms, power slot rotors, hawk pads. fml

November 4th, 2009, 10:55 PM	#5
limited Hardcore Enthusiast Join Date: Mar 2007 Location: Tacoma,Washington Posts: 2,069	it goes by throttle postion more than rpm. the bypass closes around 4 or 5" vacuum. You can turn 4000 rpm and still not be in boost. at 2000 rpm cruise and steady throttle, i am around 15" vacuum,push throttle to halfway point I am at around 5 psi boost. Floor it and I am at full boost instantly __________________ 99 L.E. conv.#1973 of 4628, KB 2.1 9 psi i/c'd. vt stage 3 blower cams,gt40 fp/bap,frpp 3:73's,demolet cai,accufab 75mm tb,Sct Ba 2400,tri-ax,bfg kdw's,magnaflows,Mac o/r H, Tuned by Joe at http://www.tricktuners.com

November 4th, 2009, 10:57 PM	#6
huggy bear Enthusiast 2001 Mustang GT .23333333 minutes Join Date: Aug 2009 Location: Inbetween a rock and a hard place Posts: 505	Awesome! what vacuum are you talking about though, sorry for my retardation. __________________ 2001 Mustang GT: 10.5 bullit rims, straight pipes, 180 degree t-stat, rear upper control arms, power slot rotors, hawk pads. fml

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November 5th, 2009, 12:49 AM	#7
RyanGT MM Fanatic 2000 GT Join Date: Dec 2006 Location: Lynnwood, Washington Posts: 4,134	Your engine creates a vacuum... you know all those hoses that have a vacuum. Anyways like mentioned it is vacuum that decides boost. like limited said you could be at 5k and tapping on pedal and wont be in boost. Or you can mash it at 2k and be at full boost. __________________ 2000 Black convertible GT: KB 15psi, and other goodies... 1971 Datsun 240 z: Header and rebuilt motor. (The DD)

November 5th, 2009, 08:43 AM	#8
huggy bear Enthusiast 2001 Mustang GT .23333333 minutes Join Date: Aug 2009 Location: Inbetween a rock and a hard place Posts: 505	gotcha! also to add to my boost questions.. as long as I stay out of boost a reasonable amount of time I wont be hurt on fuel mileage right? also I have 91K fro miles should I be fine to run a 2.1 KB as long as I stay out of boost a good of amount of time I drive? __________________ 2001 Mustang GT: 10.5 bullit rims, straight pipes, 180 degree t-stat, rear upper control arms, power slot rotors, hawk pads. fml

November 5th, 2009, 09:14 AM	#9
LAWNDART02 Regular 02 GT Join Date: Aug 2008 Location: Detroit Posts: 192	Check out the FAQ'a on the KB website Kenne Bell Web Home There is a ton of useful info about the 2.1L SC for our 4.6 GTs.. "Safety" can be a relative term. Weather or not you use an innercooler, how much Boost are you pullied for, condition of the fuel system, etc.. But most will agree the biggest factor is the tune. Check out the website- Lots of info to help with your project. __________________ 02 2v 5sp

November 5th, 2009, 10:35 AM	#10
wishIhada5.0 Hardcore Enthusiast 2002 GT, True Blue, Stick Join Date: Feb 2008 Location: About an hour east of Pittsburgh Posts: 2,737	+1 you shouldnt be in boost if your accelerating normally or cruising along....when you mat the gas thats when all hell breaks loose lol __________________ True blue crew founder/member #1 MM's late nite crew #4 378/442 rwhp/rwtq...Don LaSota tuned on a Mustang dyno

November 5th, 2009, 10:41 AM	#11
1FastFox MMs Official Playboy Only Time will tell... Join Date: Mar 2007 Location: Indiana Posts: 4,603	+1 to these guys.. You wont be boosting at you not at WOT. DOnt you have a boost guage?

November 5th, 2009, 10:45 AM	#12
wishIhada5.0 Hardcore Enthusiast 2002 GT, True Blue, Stick Join Date: Feb 2008 Location: About an hour east of Pittsburgh Posts: 2,737	I think the OP is debating on whether or not to go FI and just has some general questions...so as of right now he probably doesnt have a gauge lol OP...if you have any KB questions feel free to PM me...I was on your quest for knowledge about these blowers for a while too....lol __________________ True blue crew founder/member #1 MM's late nite crew #4 378/442 rwhp/rwtq...Don LaSota tuned on a Mustang dyno

November 5th, 2009, 01:37 PM	#14
LAWNDART02 Regular 02 GT Join Date: Aug 2008 Location: Detroit Posts: 192	BTW- I've been wondering what it does if you downshift into a higher RPM? Does it surge or anything? __________________ 02 2v 5sp

November 5th, 2009, 02:58 PM	#18
huggy bear Enthusiast 2001 Mustang GT .23333333 minutes Join Date: Aug 2009 Location: Inbetween a rock and a hard place Posts: 505	Nice avatar^ __________________ 2001 Mustang GT: 10.5 bullit rims, straight pipes, 180 degree t-stat, rear upper control arms, power slot rotors, hawk pads. fml

November 5th, 2009, 06:16 PM	#20
RyanGT MM Fanatic 2000 GT Join Date: Dec 2006 Location: Lynnwood, Washington Posts: 4,134	Ya i start getting boost at like 1/4, don't get full boost till about 3/4-WOT at the throttle position. At about half im at 10psi. Wot 15.5 or so. __________________ 2000 Black convertible GT: KB 15psi, and other goodies... 1971 Datsun 240 z: Header and rebuilt motor. (The DD)

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