do I need a tune if...
Team Owner
Joined: Jul 2004
Posts: 28,475
Likes: 3,291
From: Hartford WI
Do you feel it is morally wrong to sell someone a set of injectors you don't think (assuming you don't) is good for much besides target practice? I suppose if you want to keep it looking 100% stock and I have a set, well....
Team Owner
Joined: Jul 2004
Posts: 28,475
Likes: 3,291
From: Hartford WI
You can clean the injector and whatever but if ethanol runs into it the coils could be damaged. If you can always use pure gas, sure. OTOH, I don't like be tied to a few gas stations only so why would I want that injector? Now if someone has to be as close to original as possible, I suppose.
Intermediate
Joined: Jun 2017
Posts: 27
Likes: 3
Probably wouldn't run perfect. I'd wait till I have headers and just do a dyno tune. Depends on how finicky you are. If you are like me, I'd do it all at once, get the tune and go with it. I'd find the facility to dyno tune instead of "guess a tune" unless they do fine tune with datalogs.
Racer
Joined: Sep 2017
Posts: 452
Likes: 55
From: Marianna Fl
The dual fire was thought to work well at low rpms by putting a "fresh" shot of fuel into more of the cylinders. By this I mean having the injectors spray on an open valve. About 10 years ago I began playing with the older MegaSquirt 1 system. It was good for batch fire and a distributor or coil pack. With it I experimented with changing injector timing and even doing the dual pulse, none of which changed the power output or fuel usage on my firebird. The reason for this is your valve is open for roughly 25% of the engine cycle(2 crank rotations) when your duty cycle is over 25% you are spraying on a closed valve.
Injector timing has the biggest impact on sequential cars up to cruising speed. Past that it's kinda a waist. I have experimented with the 60* v6 and the LT1 on the megasquirt platform and unfortunately there are only 2 ways to get more fuel, bigger injectors and higher pressure. And a fun fact flow does not increase linearly with pressure, the rate if pressure increase is inversely proportional to the flow rate.
Injector timing has the biggest impact on sequential cars up to cruising speed. Past that it's kinda a waist. I have experimented with the 60* v6 and the LT1 on the megasquirt platform and unfortunately there are only 2 ways to get more fuel, bigger injectors and higher pressure. And a fun fact flow does not increase linearly with pressure, the rate if pressure increase is inversely proportional to the flow rate.
Team Owner
Joined: Jul 2004
Posts: 28,475
Likes: 3,291
From: Hartford WI
How do you figure? To make a 24 spray like a 22, doesn't that mean he has to reprogram the ECM to 22pph specs? IOW, it should have more pulse width to spray the same volume. If you make 5 passes with a 5 gallon bucket, you have more water than 5 passes with a 1 gallon bucket.
Thread Starter
Instructor
Joined: May 2017
Posts: 176
Likes: 3
From: VA
I have 1991 speed density tpi.
I'm trying to data log with tunerpro. I continuously get da error and corrupted data results.
This seems to be common with 90-91 cars.
Does anyone have a fix. I can't find it.
I'm trying to data log with tunerpro. I continuously get da error and corrupted data results.
This seems to be common with 90-91 cars.
Does anyone have a fix. I can't find it.
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Racer
Joined: Sep 2017
Posts: 452
Likes: 55
From: Marianna Fl
Thread Starter
Instructor
Joined: May 2017
Posts: 176
Likes: 3
From: VA
so I have a moates usb aldl cable and I am trying to use tunerpro.
I am recording data logs and now a major problem I am having is the loop status fluctuates between open and closed while driving.
I now this is not normal. what I don't know is if the car is actually sending an accurate signal, or, a problem within tunerpro.
has anyone ever had experience with this issue?
what can I do?
O2 sensor is new.
Can someone look the attached datalog and give some insight to the o2 readings?
I am recording data logs and now a major problem I am having is the loop status fluctuates between open and closed while driving.
I now this is not normal. what I don't know is if the car is actually sending an accurate signal, or, a problem within tunerpro.
has anyone ever had experience with this issue?
what can I do?
O2 sensor is new.
Can someone look the attached datalog and give some insight to the o2 readings?
Last edited by clove86; Oct 12, 2018 at 02:34 PM.
Thread Starter
Instructor
Joined: May 2017
Posts: 176
Likes: 3
From: VA
reviving a dead thread
same general topic.
I just bought a miniram and found after the fact that it is a 1205 gasket kit.
will I have a problem installing the 1205 gasket MR onto a stock 350 L98 heads?
I understand that it will not flow to its true potential.
will the car run decently enough until I can get a custom tune?
I am looking at a new cam and getting the heads PP and valve job done in the future.
I have read many other threads where people have done similar builds but I have not found the true answers to my questions.
all help is appreciated.
same general topic.
I just bought a miniram and found after the fact that it is a 1205 gasket kit.
will I have a problem installing the 1205 gasket MR onto a stock 350 L98 heads?
I understand that it will not flow to its true potential.
will the car run decently enough until I can get a custom tune?
I am looking at a new cam and getting the heads PP and valve job done in the future.
I have read many other threads where people have done similar builds but I have not found the true answers to my questions.
all help is appreciated.
Last edited by clove86; Apr 9, 2020 at 01:02 PM.
