HELP !!!!! 14.13 @ 100mph with supercharger

nasty92LX · August 2nd, 2007, 03:45 PM

I just put a paxton sn-89 on my car it has a 6psi pully. I normaly go 14.20s @ 98mph. I do not have the fmu hooked up. Will that not let the supercharger work right. I do not have any vac leaks either. The vac reads between 20 and 15 at idle. I dont know what els it could be.

TurboLX · August 2nd, 2007, 04:00 PM

well vac is at normal

and theres problably something wrong with your tune

whats your fuel setup?

nasty92LX · August 2nd, 2007, 04:01 PM

it is all stock

nolife · August 2nd, 2007, 04:21 PM

Are you getting any actual indicated boost? Any pinging or other indications that you are running lean?

Although the FMU does not directly effect the SC, it does provide more fuel under boost. Not sure how much multiplication you would need with 19# injectors with 6# boost though.

Without a fuel pressure gage and wide band A/F gage in the car that you can monitor closely while under load, you will never know what is going on in there. I'd suggest a dyno tune before something goes terribly wrong.

nasty92LX · August 2nd, 2007, 04:23 PM

okk it does not ping or anything

TurboLX · August 2nd, 2007, 05:44 PM

dude its simple, Upgrade the fuel system

theninja · August 2nd, 2007, 08:51 PM

Vaacuum is normal?

I thought that when you "boost" you have no more vaacuum? You aren't relying on the sucking air in anymore, you're forcing it in.

Vaacuum = negative boost

I could be reading your post wrong or just be confused myself, but I don't think you should see any more vac. when you properly get boostin'.

EDIT: NM, I'm just confused myself.

Iownastang · August 2nd, 2007, 09:20 PM

Did it hook good.

baine21225 · August 2nd, 2007, 09:27 PM

i'd guess it's the fuel system

nasty92LX · August 2nd, 2007, 10:31 PM

it hooked fine i still have a 3.27 rear. Max boost goes up to 4 1/2psi. I will upgrade the fuel system. Im new with a super charger so i do not know much about them.

88dragstang · August 2nd, 2007, 10:38 PM

what was your 60 ft time and 1/8 mile time?

JBIGBOOTSY · August 2nd, 2007, 11:14 PM

Originally Posted by theninja

Vaacuum is normal?

I thought that when you "boost" you have no more vaacuum? You aren't relying on the sucking air in anymore, you're forcing it in.

Vaacuum = negative boost

I could be reading your post wrong or just be confused myself, but I don't think you should see any more vac. when you properly get boostin'.

EDIT: NM, I'm just confused myself.

Most all forced induction engines make vacuum at idle and higher, depending on the SC, or turbo size and trim. some don't make +boost till higher RPM, or load. Some make it at lower RPM, load, but they all make vacuum at some point.

TurboLX · August 2nd, 2007, 11:47 PM

Forced induction or not, Vac will remain the same unless theres a leak, my turbo doesnt spool up till about 3200rpms and immediatly shoots right to 27psi and then back down to 0 when coasting and then at idle in between 27 and 30 vac

JBIGBOOTSY · August 2nd, 2007, 11:56 PM

Check vacuum lines, they may be cracked and not leak under vac. but open up during boost. 4.5psi with a 6psi kit, I would only assume that theres a leak somewhere.

StangAddiction · August 3rd, 2007, 10:38 AM

Originally Posted by nasty92LX

it is all stock

No way u put a supercharger on your car with the stock pump and injectors...

nasty92LX · August 3rd, 2007, 11:01 AM

yes way i did

StangAddiction · August 3rd, 2007, 11:38 AM

thats not a good idea...I'd recommend you go get a nice 255-lph pump, AT LEAST 30 lbs/hr injectors and an adjustable fuel pressure regulator. Your engine is probably running dangerously lean right now. U could break something running lean like that. Im surprised u lasted down the quarter like that.

nasty92LX · August 3rd, 2007, 12:19 PM

i have a air to furl gauge and it says its running fine i ran it down the track and shut if off after the traps and pulled a plug and it looked fine

jam77 · August 3rd, 2007, 12:50 PM

The injectors are fine at that boost level i have a charger running 6 psi and i have no problems. I did upgrade to a 255 lph pump and a adj regulator. I would get a tune or possibly a fmu.

TurboLX · August 3rd, 2007, 01:38 PM

it maybe fine at idle but once it start's going in higher in RPM's, the fuel is gonna cut out and and not be able to give as much fuel as the engine needs

August 2nd, 2007, 03:45 PM	#1
nasty92LX Regular Join Date: Mar 2007 Posts: 184 iTrader: 0 reviews	HELP !!!!! 14.13 @ 100mph with supercharger I just put a paxton sn-89 on my car it has a 6psi pully. I normaly go 14.20s @ 98mph. I do not have the fmu hooked up. Will that not let the supercharger work right. I do not have any vac leaks either. The vac reads between 20 and 15 at idle. I dont know what els it could be.

August 2nd, 2007, 04:00 PM	#2
TurboLX I Post Entirely Way Too Much 1988 Mustang LX Turbo Join Date: Oct 2006 Location: NY Posts: 8,778 Blog Entries: 1 iTrader: 0 reviews	well vac is at normal and theres problably something wrong with your tune whats your fuel setup? __________________ 1988 LX Coupe 2.5L, GT35R, 44mm WG, 32psi, C16.

August 2nd, 2007, 04:21 PM	#4
nolife MM Fanatic 91GT, 88GT, 02GT Join Date: Dec 2006 Posts: 3,057 Blog Entries: 3 iTrader: 0 reviews	Are you getting any actual indicated boost? Any pinging or other indications that you are running lean? Although the FMU does not directly effect the SC, it does provide more fuel under boost. Not sure how much multiplication you would need with 19# injectors with 6# boost though. Without a fuel pressure gage and wide band A/F gage in the car that you can monitor closely while under load, you will never know what is going on in there. I'd suggest a dyno tune before something goes terribly wrong. __________________

August 2nd, 2007, 05:44 PM	#6
TurboLX I Post Entirely Way Too Much 1988 Mustang LX Turbo Join Date: Oct 2006 Location: NY Posts: 8,778 Blog Entries: 1 iTrader: 0 reviews	dude its simple, Upgrade the fuel system __________________ 1988 LX Coupe 2.5L, GT35R, 44mm WG, 32psi, C16.

August 2nd, 2007, 08:51 PM	#7
theninja Regular Join Date: Jul 2007 Posts: 100 iTrader: 0 reviews	Vaacuum is normal? I thought that when you "boost" you have no more vaacuum? You aren't relying on the sucking air in anymore, you're forcing it in. Vaacuum = negative boost I could be reading your post wrong or just be confused myself, but I don't think you should see any more vac. when you properly get boostin'. EDIT: NM, I'm just confused myself. __________________ 1986 Mazda RX7 (302 cubic inches soon) 2000 Subaru Impreza 2.5RS

August 2nd, 2007, 04:01 PM	#3
nasty92LX Regular Join Date: Mar 2007 Posts: 184 iTrader: 0 reviews	it is all stock

August 2nd, 2007, 04:23 PM	#5
nasty92LX Regular Join Date: Mar 2007 Posts: 184 iTrader: 0 reviews	okk it does not ping or anything

August 2nd, 2007, 09:20 PM	#8
Iownastang I Post Entirely Way Too Much 1987 ford mustang gt well see when shes done Join Date: May 2007 Location: mascot, tn Posts: 5,020 iTrader: 0 reviews	Did it hook good. __________________ 2004 tahoe z71 Daily 2004 BBM Gto ls1 6 speed 57,000 miles 1987 mustang hatch,347,world heads,systemax, kooks lts,nitrous, 6 point cage, team z front and rear suspension,8.8, 4.10s, 31 splines strange axles,wilwood brakes, tko600

August 2nd, 2007, 09:27 PM	#9
baine21225 MM Fanatic Join Date: Jun 2007 Location: Baltimore, MD Posts: 4,349 iTrader: 1 reviews	i'd guess it's the fuel system __________________ "That's how Dad did it, that's how America does it... and it's worked out pretty well so far..."

August 2nd, 2007, 10:31 PM	#10
nasty92LX Regular Join Date: Mar 2007 Posts: 184 iTrader: 0 reviews	it hooked fine i still have a 3.27 rear. Max boost goes up to 4 1/2psi. I will upgrade the fuel system. Im new with a super charger so i do not know much about them.

August 2nd, 2007, 10:38 PM	#11
88dragstang Regular Join Date: Apr 2007 Posts: 83 iTrader: 0 reviews	what was your 60 ft time and 1/8 mile time?

August 2nd, 2007, 11:47 PM	#13
TurboLX I Post Entirely Way Too Much 1988 Mustang LX Turbo Join Date: Oct 2006 Location: NY Posts: 8,778 Blog Entries: 1 iTrader: 0 reviews	Forced induction or not, Vac will remain the same unless theres a leak, my turbo doesnt spool up till about 3200rpms and immediatly shoots right to 27psi and then back down to 0 when coasting and then at idle in between 27 and 30 vac __________________ 1988 LX Coupe 2.5L, GT35R, 44mm WG, 32psi, C16.

August 2nd, 2007, 11:56 PM	#14
JBIGBOOTSY MM Fanatic 1990 LX hatch Join Date: Aug 2006 Location: Hobart Indiana Posts: 4,391 iTrader: 0 reviews	Check vacuum lines, they may be cracked and not leak under vac. but open up during boost. 4.5psi with a 6psi kit, I would only assume that theres a leak somewhere. __________________ Bolt-on Abraham Lincoln Log motor. With extra wiring.

August 3rd, 2007, 11:01 AM	#16
nasty92LX Regular Join Date: Mar 2007 Posts: 184 iTrader: 0 reviews	yes way i did

August 3rd, 2007, 11:38 AM	#17
StangAddiction Enthusiast 2000 Mustang GT Join Date: Jan 2007 Location: Virginia Beach Posts: 986 iTrader: 0 reviews	thats not a good idea...I'd recommend you go get a nice 255-lph pump, AT LEAST 30 lbs/hr injectors and an adjustable fuel pressure regulator. Your engine is probably running dangerously lean right now. U could break something running lean like that. Im surprised u lasted down the quarter like that.

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August 3rd, 2007, 12:19 PM	#18
nasty92LX Regular Join Date: Mar 2007 Posts: 184 iTrader: 0 reviews	i have a air to furl gauge and it says its running fine i ran it down the track and shut if off after the traps and pulled a plug and it looked fine

August 3rd, 2007, 12:50 PM	#19
jam77 Enthusiast 1987 Mustang GT Join Date: Apr 2007 Location: IL Posts: 685 iTrader: 0 reviews	HELP !!!!! 14.13 @ 100mph with supercharger The injectors are fine at that boost level i have a charger running 6 psi and i have no problems. I did upgrade to a 255 lph pump and a adj regulator. I would get a tune or possibly a fmu. __________________ 87 GT, typhoon upper and lower,70mm tb, 90mm maf, bbk shorties, bbk x-pipe, flowmaster cat back, 3:73 gear, pro 5.0 shifter, novi blower,afm power pipe, load IO, Trick Flow heads, Anderson B-31 cam, Anderson PMS, 42 lb injectors, t-rex fuel pump.

August 3rd, 2007, 01:38 PM	#20
TurboLX I Post Entirely Way Too Much 1988 Mustang LX Turbo Join Date: Oct 2006 Location: NY Posts: 8,778 Blog Entries: 1 iTrader: 0 reviews	it maybe fine at idle but once it start's going in higher in RPM's, the fuel is gonna cut out and and not be able to give as much fuel as the engine needs __________________ 1988 LX Coupe 2.5L, GT35R, 44mm WG, 32psi, C16.

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