Why is my car slow???

ace50421 · 08-09-2004, 12:12 AM

I have a 1988 LX. It is an original 45,000 mile car.

Stuff it has:
93 cobra upper and lower intake
65 MM throttle body
70 MM MAF
24# injectors
stock heads
cobra computer
mac shorty headers
3.73 gears
pro 5.0 shifter
alu driveshaft
Tremec Z tranny
Boxed upper and lower control arms
Tociko Illumina 5 way adj
Timed at 14 degrees

My car runs a 14.20 in the quarter mile at 97.4MPH. I seem to get a good 60 ft time. They are usually 2.1. The car seems to lose power in the high end. I only picked up .2 in the quarter mile when I put the cobra kit on my car. My friend has the same work done to his car that I have done to mine. He has a 77MAF though. I dont think a 77MAF would make that much of a difference. He smokes my car. His car has 160,000 miles on it. Should I put an A9l computer in my car instead of the computer since I dont have the cobra heads?? I lose to pretty much stock mustangs too. Any suggestions???

aar0s · 08-09-2004, 06:11 PM

im going out on a limb saying you eather did the mass air conversion or you have a cali car but you need to ditch the cobra cpu, from what i understand they eather take out spark or fuel at a some speed that i cant remember. other than that i would change to the gt 40 heads and 1.6 roller tip rockers. oh yeh, dont granny shift.

HonestAl · 08-10-2004, 12:17 AM

All I've ever run has been the A9L computer so I don't know about that but your STOCK HEADS are killing you.

Dark_5.0 · 08-10-2004, 08:45 AM

The cobra computer pulls timing between shifts. Get an A9L, its a direct replacement.

blue00gt · 08-10-2004, 02:39 PM

I have also heard that about the Cobra computer.

After that you should definitely get some heads and a cam (I'm assuming you have the stock cam since it wasn't listed). Just to give you an idea of how restrictive the stock heads and cam are, I raced a notchback with a 6 psi centrifugal blower (otherwise completely stock motor) with my '00 GT with bolt-ons and gears and he beat me out of the hole by .25 on ET streets and I passed him at the 1/8th mile because he had no top end.

88workcar · 08-13-2004, 06:07 AM

you are OVERINJECTED

srv1 · 08-13-2004, 11:42 PM

Quote:

Originally posted by 88workcar
you are OVERINJECTED

I totally agree. Go back to 19's and get a adjustable fuel pressure regulator and a gauge. Now I dont have a adjustable fuel pressure regulator, but I do have the RPM Extender and I gained 10 horses to the wheels by leaning out the mixture. Stangs run rich from the factory. Tune that fuel and do what Workcar said. Hell he made it in the 12's with E7's. I run 14.1 on my car with it being stock with 1.7's and 3.55 gears on street tires. Also check your PM's.

James

08-09-2004, 12:12 AM	#1
ace50421 Registered Member Join Date: Aug 2004 Posts: 1	Why is my car slow??? I have a 1988 LX. It is an original 45,000 mile car. Stuff it has: 93 cobra upper and lower intake 65 MM throttle body 70 MM MAF 24# injectors stock heads cobra computer mac shorty headers 3.73 gears pro 5.0 shifter alu driveshaft Tremec Z tranny Boxed upper and lower control arms Tociko Illumina 5 way adj Timed at 14 degrees My car runs a 14.20 in the quarter mile at 97.4MPH. I seem to get a good 60 ft time. They are usually 2.1. The car seems to lose power in the high end. I only picked up .2 in the quarter mile when I put the cobra kit on my car. My friend has the same work done to his car that I have done to mine. He has a 77MAF though. I dont think a 77MAF would make that much of a difference. He smokes my car. His car has 160,000 miles on it. Should I put an A9l computer in my car instead of the computer since I dont have the cobra heads?? I lose to pretty much stock mustangs too. Any suggestions??? __________________ One Sick LX!

08-09-2004, 06:11 PM	#2
aar0s Registered Member Join Date: Nov 1998 Location: southern Illinois Posts: 312	im going out on a limb saying you eather did the mass air conversion or you have a cali car but you need to ditch the cobra cpu, from what i understand they eather take out spark or fuel at a some speed that i cant remember. other than that i would change to the gt 40 heads and 1.6 roller tip rockers. oh yeh, dont granny shift. __________________ 88 gt convertable =-= cobra intake, accufab 65 mm tb headers alum underdrives steeda alum.lca's, springs, c/c plates kyb struts 230 hp to da wheels http://www.cybersteed.freeservers.com

08-10-2004, 08:45 AM	#4
Dark_5.0 Registered Member Join Date: Apr 2001 Location: Staging lane Posts: 4,337	The cobra computer pulls timing between shifts. Get an A9L, its a direct replacement. __________________ 92' LX-Big brakes, Lots and lots of suspension, GT40X heads, Ported cobra intake, stock cam, Vortech SC trim. 00' Lightning-Stock 88'CRX-13 second ego killer

08-10-2004, 02:39 PM	#5
blue00gt Mustang Addict Join Date: Jan 2001 Location: McKinney, TX Posts: 1,294	I have also heard that about the Cobra computer. After that you should definitely get some heads and a cam (I'm assuming you have the stock cam since it wasn't listed). Just to give you an idea of how restrictive the stock heads and cam are, I raced a notchback with a 6 psi centrifugal blower (otherwise completely stock motor) with my '00 GT with bolt-ons and gears and he beat me out of the hole by .25 on ET streets and I passed him at the 1/8th mile because he had no top end. __________________ Strike down the unroadworthy! 2000 GT Atl. Blue: '03 Cobra motor - 465rwhp/473rwtq, T-56 6-speed, full MM TA/PH & tubular K-member suspension, Saleen body, 17" Torq-Thrust II's, M/T ET Street radials, and lots more '94 Rio Red Cobra: All the bolt-ons, 3.73s

08-13-2004, 06:07 AM	#6
88workcar Registered Member Join Date: Oct 1999 Location: Pierre Part, La. U.S.A. Posts: 1,850	you are OVERINJECTED __________________ 88workcar 1988 Mustang LX 342. 417rwhp @ 6800. 28 X 10 ET Drag, 4.30s, 10.69 @ 126.43 1.42 60ft. 11.13 @ 127.7 on BFGs 1.72 60ft Rice Hater # 42 To be old and wise, You must first be young and stupid I'm somewhere in tthe middle.

08-10-2004, 12:17 AM	#3
HonestAl Registered Member Join Date: Jul 2004 Location: 97101 Posts: 47	All I've ever run has been the A9L computer so I don't know about that but your STOCK HEADS are killing you.

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