I have been playing around with idea for some time and have different set-ups running trough my head. I know this mostly a car board but was hoping to get some input. I have been searching treads and there is allot of good experience and knowledge on this site.
I was hopping we could bounce some ideas around on my set-up (that is in my head).
I guess I can lay things out and we can go from there.
The motor in my truck is a 350 bored 30 over and has a 275 cam

Basic Operating RPM Range:1,800-5,800
Intake Duration at 050 inch Lift:221
Exhaust Duration at 050 inch Lift:231
Duration at 050 inch Lift:221 int./231 exh.
Advertised Intake Duration:275
Advertised Exhaust Duration:285
Advertised Duration:275 int./285 exh.
Intake Valve Lift with Factory Rocker Arm Ratio:0.470 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio:0.470 in.
Valve Lift with Factory Rocker Arm Ratio:0.470 int./0.470 exh.
Lobe Separation (degrees):108

It pulls 10 to 11 inches of vacuum @ idle. I have a 700 R4 that I am currently running the lock-up with a b&m adjustable controller.

I want to run a stealth ram intake, I have a small (stock throttle body) distributor.
My first big question is I have heard that a stock ecm will have trouble with my cam and unless I know someone that can tune and burn proms. It would be costly to get it running/idling right.
Could I run a megasquirt 2?
And possibly program it myself?

I will add more info on my set-up plans as we go. But this is a big concern for me right now

Thanks
Richard

 

So far, the nature of your questions would apply to something that could be considered for a 3rd gen, so I'll let it stand. But, if you start asking questions specific to the truck platform, that's where we'll have to draw the line.

With that cam, the Stealth Ram is the right choice. Stock TPI wouldn't cut it.

Not sure what ECM you have, but in general, you will need to do some computer tuning.

Yes.

Do you mean program the Megasquirt yourself?

If you meant the stock ECM, with the right hardware and software, yes.

 

Thanks five7kid,
I understand there is a line that does not need to be crossed. Yall have alot of experience with set-ups and I will do my best not to ask any questions directly related to the truck installation.
My main concerns are getting the correct parts together to do the swap. It will be on me to take it from there.

More info on my ecm question.
I do not have an ECM. I would like to run Speed density (90-92 factory ecm) (main reason is it will look nice under the hood without the mass air "sad I know" I understand that the mass air would be better for the cam)

For the sake of argument I am assuming that it will be easier to use a megasquirt2 than a factory ecm (i.e. no special software purchase or hardware to burn proms). Am I off base here?

I guess my next question is more of an opinion but I have to ask...
Would the learning how to tune a factory ECM be harder than the Megasquirt?

 

For TPI systems, the SD is typically considered superior for higher performance because of the limits to the MAF system.

I'll leave it to the more experienced to discuss the relative merits of factory ECM vs. Megasquirt.

 

five7kid,

After doing some more reading, I was wondering if you think if would be better to move this tread over to "DFI and ECM". I think most of my questions will be directed towards which ECM to use.

 

You got it.

 

check this out dynamicefi.com

 

Thanks Ronny,
Will a factory 1227730 or 1228253 ecm work high impedance (15.3 ohm) injectors?

 

for the 730 ,8 port saturated injectors, yes. I have never worked with the p4 1228253 so have no idea what code or what all it will support.

 

Thanks!
If I were to use your advice and get a 1227730 ECM
Would it work with a TPS & IAC from a lt1 throttle body?

 

I think the Mega Squirt and the EBL P4 Flash System on an 1227730 ECM are looking the best to me right now.
I have ruled out a stock ecm and burning proms. Am I overlooking other options?
My biggest concerns are the ECM working with my doner parts.
(Saturated injectors, lt1 thottle body"IAC,TPS")

 

A lt1 throttle body will work on a tpi but if you are using a 89-92 tpi plenum you will need notch between the throttle blades so the iac passage can get a manifold vacuum signal. The lt1 throttle linkage is not setup for a tv cable but you might be able to use a lokar tv cable on a lt1 throttlebody that has a cruise control stud, Im just not sure of the geometry I think the tpi tv stud is back further.

https://www.thirdgen.org/forums/tpi/...t-iac-use.html

 

Thanks, I think I will be ok. I plan on using the stealth ram intake. But I will pay attention to the vacuum passages. And I read about the tv cable. I do have a 700r4. So I will have to work that out.
I think the IAC for both throttle bodies are both stepper motors and should be close to the same. I am just assuming that the TPS is the same.
I think I am leaning towards the megasquirt.
But I guess I need to read more on the factory ECM I have been reading the most about the megasquirt.

 

the tps are physically different but still work the same 5v ref ground and ecm feedback.

 

I was busy when I read your last post and didn't read the link thanks for posting it. That is some good info there.

 

Just sold my 1969 C10, almost put a TPI in it. It went all the way to Charlotte, NC

 

I miss my 69 ;(

 

Nice trucks! Mine is kinda a beater... I have had it a long time and plan on rebuilding it one day "again" since it got wrecked when I was younger.

Tuned, I have run into a couple of your posts, do you think I am waisting my time with that cam? I want to learn how to get it to idle right and would be willing to try, but at the same time don't want to fight a lossing battle.

 

I would shoot for higher manifold vacuum like a comp XE268H

 

Looks pretty straight and solid too me!

I had a build thread for mine on Pro-touring.com, did complete suspesion, disc swap, muncie and 350 swap. Mine was a 2nd owner, the first was the US Air Force.

 

Thanks,

I do have a 2,200 stall in my 700r4. Do you think I could bump that cam up?
Or will I get back to where I am now with the idle issue?

 

speed density does not like big cams, You might want to email rbob at dynamic efi and ask his opinion he includes calibration files to help get you going and do ve learns to take hours off you data logging and re-burning chips.

 

Thanks again,
Man I am torn, save some $ spend more time, or save some time spend more $...

 

Give me a shout if you decide to go to an aftermarket ECM. I have an extra dfi thruster system. I have one on my 78 K5 and love it.