simple knock,idc,and timing questions

[1993gsxtalon]

Ok so i did some little 2nd gear pulls tonight with maybe 13psi and a clutch thats pretty much toast(for real). Here is some numbers i got.
Knock sum -3
Injector duty cycle-103
Timing? (diff page on logger)

So my question is whats a safe knock,injector duty cycle, and timing advance for these mods( no threads show any info for my setup, if so please direct me)?

fmic
all free mods
bov
downpipe
2.5 exhaust no cat
logger
tubular mani
14b
stock fuel system
mbc-set at prob 15-16psi
"ported head"
ported o2 ho

 

[97gstjosh]

to have your IDCs that high I would assume that you might find something big or a lot of little somethings. You know what assuming does though

 

[1993gsxtalon]

Ha ha ya well im on my way to do the test im hoping i find some big a$$ leaks so it wont be anything else.Ill post results tonight

 

[1993gsxtalon]

Ok i performed the test and it looks like the only leak i have is coming from that tiny little hole in the mbc. what do i do now, isnt that suppose to be there?

 

[steve]

What happened when you blocked off the MBC vacuum home?
At what pressure did the MDC start leaking?

You have to keep going finding leaks and fixing or blocking them until you reach you boost pressure or higher and can hold that pressure without adding additional air for 30 seconds or longer.

 

[1993gsxtalon]

Ok ill try it again tom.. Can i just eliminate the mbc for another test.

And isnt that mbc hole a huge boost leak anyways? like even if a have other leaks that little sucker leaks like crazy?

 

[1993gsxtalon]

? any one

 

[Lonnie gandee]

Yes, remove the mbc, and retest...

The timing numbers your looking for, are around 18-24* at wot... Should also read around 8-10* at 750 rpm....

 

[1993gsxtalon]

Wow! My timing is 45degrees at wot and a new high of 117% idc, im soooo confused?

 

[Lonnie gandee]

You need to post a chink of a log like this...
Keep in mind all this is wot!!
rpm knock tima o2
4500.00 0.00 24 .80
4750.00 0.00 22 .80
4937.50 0.00 22 .80
5187.50 1.00 21 .80
5250.00 0.00 21 .80
5406.25 1.00 20 .80
5593.75 0.00 21 .78
5781.25 0.00 22 .78
5843.75 0.00 21 .80
6031.25 1.00 19 .80
6062.50 0.00 20 .80
6125.00 0.00 22 .80
6218.75 0.00 20 .80
6468.75 0.00 20 .78
6500.00 0.00 21 .78
6531.25 0.00 19 .78
6687.50 1.0 0 19 .78
6812.50 0.00 20 .78
6781.25 0.00 19 .78
6843.75 0.00 20 .80
 shift to 4th gear
5093.75 9.00 19 .78
5187.50 9.00 19 .76
5218.75 8.00 19 .78
5375.00 7.00 18 .78
5468.75 7.00 19 .78
5500.00 7.00 19 .78
5500.00 7.00 19 .78
5562.50 6.00 20 .78
5718.75 5.00 19 .,78
5878.05 5.00 19 .78
6112.50 4.00 20 .78
6418.75 6.00 20 .78
6643.50 5.00 20 .78
6950.00 5.00 20 .78
7132.50 5.00 19 .78
7340.00 5.00 19 .78
7680.50 4.0 21 .80
7918.00 5.00 20 .78
8090.50 4.0 21 .78

At this point inj dc is worthless.... You need to check your timing...

I see 120-125%.. On pump gas.

 

[1993gsxtalon]

120 -125% is that not dangerous?
I cant figure out how to print a log like that.
Maybe a stupid question but timing belt job was just done and how do i check the timing, and what to look for?

Thanks everyone!!!!!!! Seriously
ps: merry dsm christmas

 

[Lonnie gandee]

It is correct to say an 80-85 % inj dc is normal...

Its not correct to say 125% is dangerous...

Anyway, forget about inj dc for a minute....

What kind of logger program are using?

 

[1993gsxtalon]

obdloggers, not the MMCD program or Palmnstien. The program is just called dsm logger, and you pick 4 options to monitor

 

[Calan]

You need to block the source for your MBC.

Pull the hose at the MBC and use a cleaned bolt and small clamp, or better... use a vacuum cap over the output nipple if you can.

EDIT:

Duh... was replying to last post on page #1

 

[Lonnie gandee]

Ok. Thats a start. The 4 you should watch should be Timing advance, knock, tps, and rpm.. For now...

When your tps (throttle position sensor) shows 100% that means your at wot...

This is where logging starts to mean something... Any other time, its worthless....WTF

Stay with me......

First watch your knock.... When your at wot, you want it to read zero...Thats - 0- ...

Then watch your timing at wot....Only at wot does your timing mean anything....

When is the last time you unhooked your ecu....If you havent...DONT..... Check your high fuel trim.... Its a value to monitor, you just have to find it..It will be in a %... Like anywhere from 80-139%..

 

[1993gsxtalon]

I can just bypass the mbc like lonnie said?
anyways, back to the timing question

 

[97gstjosh]

It is correct to say an 80-85 % inj dc is normal...

Its not correct to say 125% is dangerous...

Anyway, forget about inj dc for a minute....

What kind of logger program are using?

Are you kidding me 125% IDC
70-75% is what you should aim for maybe 80%

 

[1993gsxtalon]

I get maybe 3 counts knock at wot.
45 degrees timing.
And between 100 and 117 idc
And i have never unhooked the ecu but i have only had the car like 4 months.
also, what does the high fuel trim mean cause i was wondering if i needed to watch that... but i do know where it is at on the logger

 

[Lonnie gandee]

Just check it, its a fixed value, that doesnt change that often, unless you've added, or removed alot fuel lately....It will give you a ballpark of where your at.

 

[1993gsxtalon]

well anyways after that what?
if thats good then i dont need to worry about anything?

 

[Lonnie gandee]

Are you kidding me 125% IDC
70-75% is what you should aim for maybe 80%

Aim for yes.

But you dont need to base your day over it.

 

[Lonnie gandee]

well anyways after that what?
if thats good then i dont need to worry about anything?

Ah, no... Just check that.

Then maybe do some research on how to check your timing belt....

 

[97gstjosh]

Aim for yes.

But you dont need to base your day over it.

Running that high is not good though.
The amount of time an injector is turned on and delivering fuel is known as the duty cycle. This is measured as a percent, so 50% duty cycle indicates that the injector is held open and held closed for an equal amount of time. When the engine needs more fuel, the time that the injector stays on (its duty cycle) increases so that more fuel can flow into the engine. If an injector stays on all the time, it is said to be static (wide open, or 100% duty cycle). Injectors should not go static in a running engine. If an injector is static in a running engine (open 100% of the time), that injector is no longer able to control fuel delivery. This could be an indication that the injector is too small for the needs of the engine. Injector duty cycle should usually not exceed 80% in a running engine at any time.

 

[1993gsxtalon]

Ok well i will update tom. on boost leaks,high fuel trim, and timing.
Anything else i should do,look for?

 

[1993gsxtalon]

Boost leak CONFIRMED! Once i eliminated to mbc there was a big leak at 15psi..Its fixed

No more boost leaks
High fuel trim 115% at WOT
Degrees of timing 45 at WOT
IDC is still at a high of 117% at WOT

I dont have a timing light but the belt was just done and alingned right?
Im stumped

 

[Lonnie gandee]

You need to check your base timing... Thats the cam angle sensor next to the valve cover...

You need to search on how to check the timing... Need to have the motor at tdc and check the timing marks first....