Car loosing power at high PRM in 3rd gear

cbarr300 · Nov 9, 2006

second: you rip through it somewhat slower since the gears are higher (numerically lower).

I was talking about the gear ratio here. Am I right in what I was saying? Maybe the terms I should have used were "less steep"..which is numerically lower.......eh, I'm tired, and learning

newho, agreed. It could be the start of an ignition problem...a VERY early start at that cuz from what I've read they just go out once someone gets to a certain rpm

TheDamned · Nov 9, 2006

Guero said:
Damn it i was wrong!!!!!!!!!! Its your fault hissin and all your "smartness"!!!!!!!!!!!!LOL!!!!!!!!!!jk

Talk about a post-whore lol

Guero · Nov 9, 2006

TheDamned said:
Talk about a post-whore lol

Yes i have nothing better to do!!!!

GreenGT- I just read your first post and what did your shift light do?

final5-0 · Nov 9, 2006

cbarr300 said:
if I'm not mistaken the car's seeing more load and needs more fuel. Maybe, just maybe, ur pump can hold up pretty good in first and second...but once u get to top end on third it just can't supply the fuel u need. Maybe u could get a fuel pressure gauge off a buddy and run it in the car just for diagnostic purposes

luck

Gotta go quickly and don't have time to read the whole thread

but

BINGO GIVE THIS MAN A CIGAR

To me ... prob sounds fuel related

Grady

cbarr300 · Nov 9, 2006

I'll take my cigar now...or a cookie, whichever.

my fuel pump is starting to go on its way out as well...though I don't have any performance problems yet. Been getting realllly loud lately and taking a about 3 seconds to start building pressure when hot. At least the one I have now is inline so all I gotta do is take the old one out and put the new one in.

You could also get a wideband. Again, something u'll want with nitrous....those can get expensive though

luck

sage2k · Nov 9, 2006

also i think anything after 100mph car adds an extra 5% fuel

cbarr300 · Nov 9, 2006

hmm...not quite sure how that fuel adder works but, to my thinking, that'd just stress that poor pump out even more.

cbarr300 · Nov 9, 2006

but the rpms happen slower higher in 3rd, thus giving the pump more time to make more pressure or keep up. Now im just thinking to my logic. But i have clue of how it really works

the rpms do happen slower in third and you are running higher rpms longer...so ur correct about that.

now onto the pump. It's not really about the pump keeping up with how FAST it revs. Its mainly about putting the volume out for as long as it needs to put it out. Since you're at higher rpms longer in third, the pump has to constantly flow a HUGE volume of fuel. If the pump is on its way out...it just can't flow that huge volume of fuel for as long as it needs to.

It may be able to hold up for a little while in the higher rpms, but it seems that his pump just can't hold up for the amount of time he's at the top end of third. My bet is that if he was to floor it in fourth gear he'd be having problems at a bit lower of an rpm since it accelerates even slower in fourth and requires even more fuel to overcome wind resistance, drag, etc.....that'd be at a rather dangerous speed though.

Just trying to help you see what's going on. Hope I didn't make things more confusing for you....I have a habit of doing that lol.

someone feel free to chime in if my logic seems a bit wrong

final5-0 · Nov 9, 2006

cbarr300 said:
the rpms do happen slower in third and you are running higher rpms longer...so ur correct about that.

now onto the pump. It's not really about the pump keeping up with how FAST it revs. Its mainly about putting the volume out for as long as it needs to put it out. Since you're at higher rpms longer in third, the pump has to constantly flow a HUGE volume of fuel. If the pump is on its way out...it just can't flow that huge volume of fuel for as long as it needs to.

It may be able to hold up for a little while in the higher rpms, but it seems that his pump just can't hold up for the amount of time he's at the top end of third. My bet is that if he was to floor it in fourth gear he'd be having problems at a bit lower of an rpm since it accelerates even slower in fourth and requires even more fuel to overcome wind resistance, drag, etc.....that'd be at a rather dangerous speed though.

Just trying to help you see what's going on. Hope I didn't make things more confusing for you....I have a habit of doing that lol.

someone feel free to chime in if my logic seems a bit wrong

Your logic looks OK to me Clay

Its all about the volume ... don't ya see

Many focus on the pressure ... but that'll be a future thread

Things happen very fast in the lower gears ... no doubt about it!

They happen so fast the prob does not have time to develop

This reminds me of a similar low/high gear thing and I'm gonna post up a new thread in talk so I don't hijack this thread.

Bye Now

Grady

sage2k · Nov 9, 2006

i thought our fuel pumps flow max volume, thats why we have return style setup?

final5-0 · Nov 9, 2006

sage2k said:
i thought our fuel pumps flow max volume, thats why we have return style setup?

Think about the 5/8" garden hose story that has been around for years.

You want more water so you turn up the pressure.

You can only go so far with pressure to get more water.

Sooner or later, you gotta move up to the 3/4" size for more volume.

With the larger size hose, you get more capability for volume. More pressure is now effective where as with the smaller size hose, it just could not allow enough volume for more pressure to supply more water.

Grady

cbarr300 · Nov 9, 2006

sweet. I'm still trying to understand cars in general and have a lottttttt to learn. Good thing is, I just hit 18 and have plenty of time to learn

This site has definately helped out a lot, too. lots of knowledgeable peeps

Car loosing power at high PRM in 3rd gear

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