strugles to go over 95

[mally69]

I took my charger out yesterday and decided to wind it up, I have  a mild built  440 4.10 gears with a 275/60/15 tire, It goes through all 3 gears fine but  it seems like when i get up to 95 mph it just struggles to go any faster  it doesnt miss or flutter or anythiing   it just seems like the rpms kinda stay in place and does not keep climbing    I just dont understand     (not a tranny issue that  i am aware of )

[aifilaw]

you have 4.11 gears and a tire that's what, 28in in diameter?
Sounds like you got a great 1/8mi track car... but your hitting 5500-6000 RPM at what, 95-105mph?
that's why you can't go faster, your engine is maxed out, keep it at that much longer and you'll blow it up. Those gears are meant for the street or the track. and you are probably through the first two gears in the first 250 ft.

[mally69]

actually i think you are right when i looked down at the tac, it did read about 5500 6000 rpm

[70charger_boy]

Geeze, my little cheesy 318 can go over 100 mph 

[Todd Wilson]

Geeze, my little cheesy 318 can go over 100 mph 

Mine will to!  Heck my old 74 Dodge pickup with a 440 and 4.10's will go 100mpg with more in it although the truck didnt like it! 



Todd

[70charger_boy]

Geeze, my little cheesy 318 can go over 100 mph 

Mine will to!  Heck my old 74 Dodge pickup with a 440 and 4.10's will go 100mpg with more in it although the truck didnt like it! 



Todd

Oh yeah, well I can reach 140 mph taching at only 4,000 rpms 

[mally69]

i thought with 4.10 i could go a little more than 100

[Rolling_Thunder]

fuel starvation may be an issue...     high rpm's = lots of fuel...

[The70RT]

fuel starvation may be an issue...     high rpm's = lots of fuel...

Yep and too little fuel at high RPM = burned pistons.

[70charger_boy]

Are you running an electric fuel pump or mechanical?  My friend ran into the same problem with his hemi and went with a high volume mallory electric fuel pump

[Runner]

how big of an air cleaner do you have?   are your secondaries working?.     try taking the air cleaner off then see if it runs out of power.     i once tried a k&n stub stack on my old 383 and when it hit 5200 rpm the car would just level out and wouldnt rpm any higher,   pulled the stub stack off and it would spin 6500 no problem again.   there just wasnt enough room between the top of the air cleaner and the stub stack to provide enough air to pull any higher rpm.   

   28 inch tire, 4.10 gears and 101 mph should only be around 5k

with a 28.5 tire, 4.10 gears my roadrunner trips the beams around 119 mph (dependeing on the weather  give or take a mph) at about 5900 rpm     i think you have a air flow or fuel flow problem.

[mally69]

i am running a holley mechanical 110 gph and 3/8 fuel lines  i pulled a few plugs and they are a flat black (not brown or white)   my cam is also on the advance mark would that matter in this situation?..
i am running a 14x3'' edelbrock air cleaner. 

[aifilaw]

sounds like
A. you need to do some tuning
B. your engine ran out of RPM's, use shorter gears if you want to go faster

[70charger_boy]

sounds like
A. you need to do some tuning
B. your engine ran out of RPM's, use shorter gears if you want to go faster

[firefighter3931]

Nobody has mentioned valve float. Will it pull 6000 rpm in any of the lower gears ?

I would try experimenting in 1st gear and see how high the engine will pull. 



Ron

[The70RT]

Nobody has mentioned valve float. Will it pull 6000 rpm in any of the lower gears ?

I would try experimenting in 1st gear and see how high the engine will pull. 



Ron

Im suprised no one has brought that up yet....good point

Probably a stupid question but are you getting full throttle?

[mally69]

tomarrow morning ill take it out and run 1st gear and see what rpm it pulls

and ill also check to see if im getting full throttle right now and let you know..

[mally69]

yep,  when the petal is down the carb is open full 

[SeattleCharger]

 

[mally69]

ok i took it for a ride this morning and this is what happend..   i can shift out of 1st 2nd at around 6200 rpm no problem getting there   pulled pretty much the whole time,  but in high gear i found that it will go about 5000 fairly quick but to go from there to 6000   it seems like takes FOREVER to get there   i dont get it

[mally69]

 

[firefighter3931]

It's running out of fuel....start by checking your float levels.

When you installed the fuel pump did you install a new fuel pump pushrod ?



Ron

[mally69]

yes i did, i got it from 440 source..  Just a qeustion, if its running out of fuel shouldn't it sputter or miss a little or not ?

[Rolling_Thunder]

hit or miss...    I have run cars to top end and they simply did not climb in RPMs - others almost stall due to sputtering and such

[mally69]

ah ok i see, that seems to be what happening to me. It  just struggles so hard to keep climbing in rpms.

so, basically i should raise my float level and try it again???   primary or secondary?