Had 4.10's installed....car tops out at 99mph??!!

wantapony2001 · 07-29-2003, 09:33 PM

ok, i have a 99gt auto , i just had 4.10's installed about a month ago or so , i havent really got on the car much that much besides just darting off the line at lights and whatnot , anyway , i was on the highway alone and wanted to see if i lost top-end due to gear swap , the car was hitting rev limiter or speed governor at about 99mph, whats the deal ? when i had gears installed they also burnt me a chip to fix the speedo and they said they "set it up for speed" . can anyone tell me why im not going any faster...? thanks

91LX2Bfast · 07-30-2003, 08:34 AM

Did you accidentally have the OD button off?
Other then that I would think the chip is a problem.

wantapony2001 · 07-30-2003, 10:21 AM

no i didnt touch the OD button , ive tried this again a few times, tops out right before 100mph , why would they set the chip up like this? i had it done at mustang magic, long island ny

91LX2Bfast · 07-30-2003, 05:00 PM

Humm, well Mustang Magic knows their stuff, so maybe it wasn't the chip. Did you ask them what they thought the problem was?

GaryDawg · 07-30-2003, 05:43 PM

Did the chip they burned replace your computer?

If not, do you have 16" wheels? 16" stock wheels on a mustang means a speed limiter of 120 mph. And if your speed limiter is still in place I could understand the gears changing 120mph to 100mph...

That's just my guess...

wantapony2001 · 07-30-2003, 06:53 PM

ahhhh i think you nailed it gary , yes i have the stock 16" pony rims , i think thats the prob then, they burnt the chip for those rims and all, ok...i am ordering a set of cobra R's real soon, either 17" or 18" , with new wheels on what kind of top end speed should i pick up?

wantapony2001 · 07-31-2003, 07:31 AM

c'mon......noone else? a hell of a lot of people sure looked at this post, ha

Badass_yellowGT · 07-31-2003, 10:20 PM

i personally don`t like 4:10`s sure you rocket off the line but the reduced gas milages and highway restirctions sometime don`t compensate 4:10`s are fine if you drag race alot other than that they are not worth it go with 3:73

just my 2 cents

GaryDawg · 08-01-2003, 12:21 PM

Quote:

Originally posted by wantapony2001
ahhhh i think you nailed it gary , yes i have the stock 16" pony rims , i think thats the prob then, they burnt the chip for those rims and all, ok...i am ordering a set of cobra R's real soon, either 17" or 18" , with new wheels on what kind of top end speed should i pick up?

I'm not absolutely sure but I think they have to reburn the main computer or something to change or remove the factory speed limiter.

Skyman · 08-01-2003, 03:14 PM

Sounds like you need to have that chip reburnt to give you a higher stop speed, the limiter is in the computer, have that fixed and you'll be able to go past 99mph... Nothing wrong w 4.10's

Skyler

GTvert · 08-04-2003, 02:31 PM

Why not get the programmer and be able to adjust for gears ,tire size, rev and top speed limiter, and your shift points for the automatic.You can also pick up a few hp in the process.I have the factory 17's with 4:10s and running a trap speed in the 1/4 over what you're claiming as top speed.So ,no problems here.If for some reason your computer thinks you are running faster than you are, would you be putting extra miles on your car?

07-29-2003, 09:33 PM	#1
wantapony2001 Registered Member Join Date: Jan 2002 Location: ny Posts: 56	Had 4.10's installed....car tops out at 99mph??!! ok, i have a 99gt auto , i just had 4.10's installed about a month ago or so , i havent really got on the car much that much besides just darting off the line at lights and whatnot , anyway , i was on the highway alone and wanted to see if i lost top-end due to gear swap , the car was hitting rev limiter or speed governor at about 99mph, whats the deal ? when i had gears installed they also burnt me a chip to fix the speedo and they said they "set it up for speed" . can anyone tell me why im not going any faster...? thanks

07-30-2003, 08:34 AM	#2
91LX2Bfast Registered Member Join Date: Dec 1999 Location: Warrington, PA Posts: 694	Did you accidentally have the OD button off? Other then that I would think the chip is a problem. __________________ '97 T-bird LX 4.6L 2V, auto SVO heads/intake, Vortech T-trim, front mounted intercooler, blower cams, Cobra crank, Manley H-beam rods, JE pistons, Aeromotive fuel system w/ 42# injectors, and much more No times yet

07-30-2003, 05:43 PM	#5
GaryDawg Registered Member Join Date: Aug 1999 Location: Las Vegas, NV Posts: 202	Did the chip they burned replace your computer? If not, do you have 16" wheels? 16" stock wheels on a mustang means a speed limiter of 120 mph. And if your speed limiter is still in place I could understand the gears changing 120mph to 100mph... That's just my guess... __________________ '98 Rio Red Mustang GT 'vert (clicky) See my "User Ride"...

07-31-2003, 10:20 PM	#8
Badass_yellowGT Registered Member Join Date: Jun 2002 Location: Western,MA Posts: 254	i personally don`t like 4:10`s sure you rocket off the line but the reduced gas milages and highway restirctions sometime don`t compensate 4:10`s are fine if you drag race alot other than that they are not worth it go with 3:73 just my 2 cents __________________ Rice Haters Club Member #55 For My car Specs Click the Home page link http://www.badassyellowgt.50g.com/

08-01-2003, 03:14 PM	#10
Skyman I need 110mph Trap Speed! Join Date: Feb 1999 Location: So, CA Posts: 4,315	Sounds like you need to have that chip reburnt to give you a higher stop speed, the limiter is in the computer, have that fixed and you'll be able to go past 99mph... Nothing wrong w 4.10's Skyler __________________ 2001 BMW M3 6spd 12.79@108 RIP ---- 1993 Notch w/ 98 4V 4.6 Fasttt... -1989 Saleen Mustang #406- 12.32@109 -1999 Black Cobra Coupe- JBA Shorties, Bassani Cat-X, Magnaflow 3", Pulleys, 85mm Pro-M, Ported Intake, Soild Rear w/ 4.30s, Tubular Front End, X2C arms, 13lb batt, few others.

07-30-2003, 10:21 AM	#3
wantapony2001 Registered Member Join Date: Jan 2002 Location: ny Posts: 56	no i didnt touch the OD button , ive tried this again a few times, tops out right before 100mph , why would they set the chip up like this? i had it done at mustang magic, long island ny

07-30-2003, 05:00 PM	#4
91LX2Bfast Registered Member Join Date: Dec 1999 Location: Warrington, PA Posts: 694	Humm, well Mustang Magic knows their stuff, so maybe it wasn't the chip. Did you ask them what they thought the problem was?

07-30-2003, 06:53 PM	#6
wantapony2001 Registered Member Join Date: Jan 2002 Location: ny Posts: 56	ahhhh i think you nailed it gary , yes i have the stock 16" pony rims , i think thats the prob then, they burnt the chip for those rims and all, ok...i am ordering a set of cobra R's real soon, either 17" or 18" , with new wheels on what kind of top end speed should i pick up?

07-31-2003, 07:31 AM	#7
wantapony2001 Registered Member Join Date: Jan 2002 Location: ny Posts: 56	c'mon......noone else? a hell of a lot of people sure looked at this post, ha

08-04-2003, 02:31 PM	#11
GTvert Registered Member Join Date: Apr 2003 Location: West Plains Posts: 74	Why not get the programmer and be able to adjust for gears ,tire size, rev and top speed limiter, and your shift points for the automatic.You can also pick up a few hp in the process.I have the factory 17's with 4:10s and running a trap speed in the 1/4 over what you're claiming as top speed.So ,no problems here.If for some reason your computer thinks you are running faster than you are, would you be putting extra miles on your car? __________________ Slower Traffic Keep Right

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