Injector change questions

superhuaman · Jan 2, 2007

I just changed my 30# injectors today to 24# and my C&L 80mm meter to a 76mm meter. Fuel pressure is currently set at 32# with the vacuum hose off. What should I set it at now? Here is my cylinder #3 spark plug. How does it look?

Also, a weird question that noone SHOULD know the answer to. What happens if you start up the engine with the TPS, IAC, and EVP unplugged, and the upper intake removed. Everything else is hooked up. I'm obviously not dumb enough to try this, but what exactly would happen?

sweet88gt · Jan 2, 2007

Also, a weird question that noone SHOULD know the answer to. What happens if you start up the engine with the TPS, IAC, and EVP unplugged, and the upper intake removed. Everything else is hooked up. I'm obviously not dumb enough to try this, but what exactly would happen? [/QUOTE]

The motor would rev until in blew up. There would be no way to adjust how much air entered the motor. Remember engines are large air pumps and it would rev very fast. I asked someone this question before and that was the answer I got. Wheter its true I dont know. Seems like it could be plausible. Where is MythBusters when you need them.

superhuaman · Jan 2, 2007

lol i know, right? i didnt know if the computer would cut back the fuel since it saw some sensors were unplugged.

JRPony · Jan 2, 2007

superhuaman said:
Also, a weird question that noone SHOULD know the answer to. What happens if you start up the engine with the TPS, IAC, and EVP unplugged, and the upper intake removed. Everything else is hooked up. I'm obviously not dumb enough to try this, but what exactly would happen?

The engine most likely wouldn't even start. There would be far too much air coming in. You might get some small flames to shoot out the intake, though.

superhuaman · Jan 2, 2007

ahh, i see. now then, what about the fuel pressure? and my spark plug?

89streetbeast · Jan 2, 2007

that plug looks like poo. too much detonation

superhuaman · Jan 2, 2007

oh dear. i guess it is too lean then since i havent felt any detonation. i probably have the fuel pressure too low then. crap i should have tried raising it before i tore it apart today. but the 30's were too big anyway. what should i set the pressure at? i have heard 39 and 44.

89streetbeast · Jan 2, 2007

superhuaman said:
oh dear. i guess it is too lean then since i havent felt any detonation. i probably have the fuel pressure too low then. crap i should have tried raising it before i tore it apart today. but the 30's were too big anyway. what should i set the pressure at? i have heard 39 and 44.

are you serious or joking man lol?

superhuaman · Jan 2, 2007

i am quite serious. i had been having uneven idle problems and set the fuel pressure at 32 psi with the hose off. later i properly set the base idle, timing, and tps, but left the fuel pressure alone. i have not noticed anything out of the ordinary except for a tendency to stall when revved up and then dropped in gear. seems like it was just the low fuel pressure.

89streetbeast · Jan 2, 2007

39psi with the vacuum unplugged is stock setting. i'd go from there and see how it does. if it still runs lean, increase a little at a time. right now mines at 42-44 with vacuum line off.

superhuaman · Jan 2, 2007

cool - i guess i will just have to wait and see how it goes and play with it some. actually i think i might pick up some SOTP power with this downgrade, since the FP wasn't right before. funny thing - it was running lean, but still fired right up in the cold, flooded on warm starts, and got 10 mpg oh well it should be more well behaved now. hey, at least i learned how to use macro mode on my digital camera

89streetbeast · Jan 2, 2007

superhuaman said:
got 10 mpg

oh man lol. that aint good.

superhuaman · Jan 2, 2007

sure aint. 150-160 miles on a tank saaaaad

89streetbeast · Jan 2, 2007

is that highway milage or city driving ? worst i got on the highway was 280, best was 320.

JChalfan · Jan 2, 2007

superhuaman said:
sure aint. 150-160 miles on a tank saaaaad

Haha, sucker, I get a good 180.

Jeff

superhuaman · Jan 2, 2007

lolol that is mostly highway. i think the 3.73's hurt the gas mileage too cuz it is right on 2500rpm's at 70mph

89streetbeast · Jan 2, 2007

superhuaman said:
lolol that is mostly highway. i think the 3.73's hurt the gas mileage too cuz it is right on 2500rpm's at 70mph

when my motor was stock back in 01 i switched from 2:73's to 3:73's and got better gas milage. after a few mods later it stayed about the same at around 21mpg. gets about the same now, little less by maybe 3 with the 3000 stall.

Roland69 · Jan 2, 2007

that plug is scarry

superhuaman · Jan 2, 2007

Roland69 said:
that plug is scarry

is it really? hmm...i guess i've been lucky then. only about 800 miles on fresh motor, not even broken in yet and it is a beast. can't wait until it is tuned better. lol

Roland69 · Jan 3, 2007

you want a tan-dark brown

it's really hard to read plugs anymore since gas has got all theese additives

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