|05-07-2013 10:55 AM|
|05-02-2013 02:32 PM|
(I s__k at search)
|01-08-2013 08:38 PM|
|cobalt327||I apologize for posting to this thread w/o warning that it was old. I should have said something in my last post- my mistake.|
|01-08-2013 07:09 PM|
MegaSquirt | Engine Management System | Electronic Fuel Injection - DIYAutoTune.com
With what you've described, the Vortec is a running engine with a good harness and sensors. If that is the case, then for less than $600 grab a MSII with the relay board and cable.
You will never need to burn a chip and hope the chip PROM was good, not just functional (good is the enemy of better and best.) You can eliminate emissions functions or keep them OR, the best part, keep them on the engine and turn them off until you head to the inspection station. Grab a wideband O2 sensor and then you can tune for mileage much better than the stock ECM ever could. Basically you can tune for AFR ratio's better for mileage in cruise condition and better for torque and horsepower in performance situations.
If you use a 97 4L series transmission, then an MSIII is capable of running the engine and trans. I assume your TBI setup is running a 2004r/700r4 old scholl mechanical other than for maybe road speed and TCC - the MSII can handle both.
$600 bucks sound like a lot of jing, but how much are you going to spend in ECM chip programming just to get a stock running unit.
I want to be sure that I sound respectful to these guys that have offered advice as I've followed alot of their posts for quite some time and these guys know their poop, but...........I think that if you start adding up prices on swapping parts from the two different engines and/or buying parts to do the swaps, and then compare that price to the Megasquirt pricing you'll find the MS cheaper or at least comparable. And also consider that you can swap in the running Vortec which is way more motor than the TBI long block.
And the best part is the datalogging and tunability - NO comparison. FYI - the software and firmware is FREE to everyone, and system is able to handle boost/nitrous control and timing control at the same time while still being a daily driver.
DIYAUTOTUNE's support is great also. Good luck. Sounds like a great swap that I'd love to try.
|01-07-2013 02:27 AM|
(click on image for more info)
|12-21-2011 09:19 PM|
The casting number of the left manifold w/the EGR tube fitting is 24673. The right is c/n 24172.
|12-21-2011 08:59 PM|
I had thought this was a performance upgrade, not just getting something into the truck that will run. At the end of the day it's up to you to decide how to spend your time and money.
|12-21-2011 08:56 PM|
|12-21-2011 08:32 PM|
|thekcbeast||well i actually have another option i have an older bare block casting # 3970010 that i also considered turning in to a tbi motor by using my tbi intake and swirl port head. nowdo you guys think this would be a better an more cost -effective build instead of going to the vortec?|
|12-21-2011 07:50 PM|
|matt167||GM used factory TBI adaptors for 4bbl manifolds on the earlier 454's. Holley makes the same adapter.. Holley #17-45. Have EGR tuned out, or get '96-'98 manifolds and EGR tubes. It's a common swap.|
|12-21-2011 07:23 PM|
Regardless of which intake manifold you use, there's an issue to be sorted out as noted by OldBoogie, the EGR deal.
Are there any Engine Machinists in here who might know if the Vortec Heads can be drilled to allow EGR flow, or is the exhaust manifold plumbing idea more feasable ?
Vortec Heads do NOT have crossover heat passages, so there is no exhaust to provide to the EGR.
As copied from another site, the TBI heating issue from water is addressed by GM with the manifold.
Hangeth-On, there, I am positive that in due time, resolutions to each of these issues will be forthcoming.
|12-21-2011 06:47 PM|
Not speaking for OB, but I believe you'll find the 5.7L TBI swirl port heads and the Vortec heads have comparable chamber volumes- usually advertised as a nominal 64cc.
And welcome to Hotrodders!
|12-21-2011 06:46 PM|
Notice, the adapters at "Trans-Dapt" are only listed to bolt to carburetor type intakes.
The TBI to manifold adapters listed were Holley, they may have the same bolt pattern I dunno.
I took a quick look at my 5.7L Vortec, the diameter of the hole is near 3" or so.
I'm pretty sure I could make an adapter to put the TBI on it at home..
Only issue is, my "estimates" on labor regarding things of this nature are,,, errr WRONG Every time.
Still, I'm sure a handyman could fabricate one from steel or aluminum if the has a TIG setup in a few hours.
IF someone does this trick, I'd bet 10cents the hood clearance would come into play, time for the old "Mount the air cleaner on the fender-well trick"
Someone said e-bay had some but they were hand made..
|12-21-2011 06:21 PM|
Aren't the 5.7L - Vortec Combustion chamber volume 64cc ?
and the 5.7L - 87-95 TBI heads 76cc ?
You are quite correct this would resolve a major hurdle, however it would take a competent machine shop to shave the heads on an "angle-cut" to resolve the major lack of compression.
Sorry, for the lack of understanding the adapter from MPFI to TBI deal
Edit to say:
Thanks guys for the lack of lighting me up with a 55gl trash bag full of acetylene
Interpretation, thanks for not Flaming Me as a N00b here
|12-21-2011 06:14 PM|
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