where is the top end mph?

mustang man · 10-04-2002, 09:18 PM

just trying to figgure out if where my top end is. I am 60 footing 1.56 with an 1/8th mile of 96mph but my top speed is 11.36 at 113.76mph. Why am I loosing so much on the top? any sugestions on shifting or anything is great. I have a 87 lx with a 409 with c-4 trans with 8.8 and 4.10's with et drags 28/10.50-15 help me

88workcar · 10-04-2002, 09:36 PM

What is the RPM when you cross the 1/4?

lx mike · 10-04-2002, 09:50 PM

How big of a stall converter do you have?? it might be slipping on topend. your only picking up 17 mph in the second 1/8. i run the 1/8 mile about 79-80 mph and i pick up about 20-21 in the second 1/8.

gofastmercury · 10-04-2002, 10:08 PM

You should be going at least 5mph faster. Do you have a fuel pressure guage you can watch during a run? Not enough fuel will slow you down on the top end.

LaxMan · 10-04-2002, 11:07 PM

I have almost the same problem and I attribute it to the converter.

I run 7.16 @ 98.92 in the 1/8th but only run the 1/4 in 11.12 at 117.

I have a 4K stall on it and I think it is slipping WAY too much at the top.

mustang man · 10-06-2002, 11:00 AM

just to answer the questions some of you have. I have a fuel pressure guage and it reads 7psi the whole way down the track I run a 830 holley so I am sure that the prob is not fuel
I have an A-1 automatics 3500 stall converter art car race prepped c-4 aluminum shaft can the converter slipping slow down the car that baddly?
or is there something else I am missing??

Superpromustang · 10-09-2002, 06:59 PM

wow I must really be getting screwed on the top end LOL, I run 7.23@ 94 in the 1/8th and only 11.74@114 in the quarter, with a 1.517 60 foot????????????????????????????
where is our top end going?

LaxMan · 10-09-2002, 11:25 PM

Quote:

Originally posted by Superpromustang
wow I must really be getting screwed on the top end LOL, I run 7.23@ 94 in the 1/8th and only 11.74@114 in the quarter, with a 1.517 60 foot????????????????????????????
where is our top end going?

Wow is right! That is great 60ft time! I am only getting around 1.70. Hopefully the C4 that I am going to put in will help that out for me. I am also hoping that a different converter will solve my top end problem.

Has anyone heard of
http://www.edgeracingconverters.com

They claim that their converters will improve your top end MPH with a more efficient coupler.

I am thinking of giving them a try.

Superpromustang · 10-10-2002, 11:46 AM

I think I found my problem..............every valve in my valvebody was stuck, fixing it right now, I'll keep everyone posted.

Kenny

Superpromustang · 11-27-2002, 11:06 PM

well I've found out where my top end was going, for starters, my direct cluthes were completely gone, and my converter was a lock-up, so now I have a fresh transmission, and a non-lock up converter, and we'll see what happens from here.

90GT Vert · 11-28-2002, 12:10 AM

If I woulda had the money, I would of got a PI Converter....Best on the market

10-04-2002, 09:18 PM	#1
mustang man Registered Member Join Date: Sep 1998 Location: Poy Sippi Wi. Posts: 111	where is the top end mph? just trying to figgure out if where my top end is. I am 60 footing 1.56 with an 1/8th mile of 96mph but my top speed is 11.36 at 113.76mph. Why am I loosing so much on the top? any sugestions on shifting or anything is great. I have a 87 lx with a 409 with c-4 trans with 8.8 and 4.10's with et drags 28/10.50-15 help me __________________ 87LX 351W, avenger heads, hooker headers, dynomax super turbo's, lots of other stuff to go fast

10-04-2002, 09:36 PM	#2
88workcar Registered Member Join Date: Oct 1999 Location: Pierre Part, La. U.S.A. Posts: 1,850	What is the RPM when you cross the 1/4? __________________ 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.

10-04-2002, 09:50 PM	#3
lx mike Undescribable Join Date: Sep 1998 Location: Ft Myers Fla Posts: 1,539	How big of a stall converter do you have?? it might be slipping on topend. your only picking up 17 mph in the second 1/8. i run the 1/8 mile about 79-80 mph and i pick up about 20-21 in the second 1/8. __________________ Rice Haters Club Member #101

10-04-2002, 10:08 PM	#4
gofastmercury Registered Member Join Date: May 2001 Location: calgary alberta canada Posts: 366	You should be going at least 5mph faster. Do you have a fuel pressure guage you can watch during a run? Not enough fuel will slow you down on the top end. __________________ 93LXcopcarSOLD14.3@96 @ 4500ft 2.02 60ft on street tires. my 67 ranchero NOT A 390 ANY MORE! 460! 3.70's cast manifolds, comp cams 262H, performer, 750DP 100K out of 79 F250 NEW(oct20/02)14.58@95mph 2.3 60 ft corrects to:13.86@100 66 merc comet351w, isky roller 600 lift 268/260@.050, vic jr. 700DP, 5000stall, 4.56's c-4, 3400lbs with driver 12.3@110 @ 4000ft 1.69 60 ft corrects to:11.69@115

10-04-2002, 11:07 PM	#5
LaxMan Registered Member Join Date: Jan 1999 Location: Sugarland, TX Posts: 458	I have almost the same problem and I attribute it to the converter. I run 7.16 @ 98.92 in the 1/8th but only run the 1/4 in 11.12 at 117. I have a 4K stall on it and I think it is slipping WAY too much at the top. __________________ 306DSS, AOD, T-Trim Vortech #3325 w/ driver 6.9882@100.33 1/8th

10-06-2002, 11:00 AM	#6
mustang man Registered Member Join Date: Sep 1998 Location: Poy Sippi Wi. Posts: 111	just to answer the questions some of you have. I have a fuel pressure guage and it reads 7psi the whole way down the track I run a 830 holley so I am sure that the prob is not fuel I have an A-1 automatics 3500 stall converter art car race prepped c-4 aluminum shaft can the converter slipping slow down the car that baddly? or is there something else I am missing?? __________________ 87LX 351W, avenger heads, hooker headers, dynomax super turbo's, lots of other stuff to go fast

10-09-2002, 06:59 PM	#7
Superpromustang Registered Member Join Date: Oct 2002 Location: Carthage, MO Posts: 59	wow I must really be getting screwed on the top end LOL, I run 7.23@ 94 in the 1/8th and only 11.74@114 in the quarter, with a 1.517 60 foot???????????????????????????? where is our top end going?

10-10-2002, 11:46 AM	#9
Superpromustang Registered Member Join Date: Oct 2002 Location: Carthage, MO Posts: 59	I think I found my problem..............every valve in my valvebody was stuck, fixing it right now, I'll keep everyone posted. Kenny

11-27-2002, 11:06 PM	#10
Superpromustang Registered Member Join Date: Oct 2002 Location: Carthage, MO Posts: 59	well I've found out where my top end was going, for starters, my direct cluthes were completely gone, and my converter was a lock-up, so now I have a fresh transmission, and a non-lock up converter, and we'll see what happens from here.

11-28-2002, 12:10 AM	#11
90GT Vert Registered Member Join Date: Nov 2002 Location: Baytown, Texas Posts: 81	If I woulda had the money, I would of got a PI Converter....Best on the market __________________ 90 Ford Mustang GT Vert AOD Some Mods..... "its ok!"