looking for a multiport intake to swap onto my TBI vortec head 350, EGR is a plus!
looking for a multiport intake to swap onto my TBI vortec head 350, EGR is a plus!
http://www.gearhead-efi.com/Fuel-Inj...ars-and-trucksOriginally Posted by Jimmie
Do you have any experience with that setup? I'm curious how they perform and how tunable they are, and would it be better to run it off the stock pcm since it controls my trans. May be an option if the performance is good and reliable. I would have to get a bootleg inspection since we have visual under hood here just for egr and such, I have a dummy EGR bolted up on my performer RPM airgap now that gets me through inspection. I started reading the thread on using an L31 intake with TBI PCM since I have one already but didn't seem like that ended very good.
Tuning the TBI PCM with a Wide Band O2 Sensor (WBO2) is a very good plan. My WBO2 thread: http://www.gearhead-efi.com/Fuel-Inj...g)-Spreadsheet
Usually 8 port injectors is better than 2 throttle body injectors, wet flow intake vs dry flow intake.
Edelbrock has discontinued production on the Vortec MPFI system (part # 3506) https://www.summitracing.com/parts/edl-3506
The factory L31 intake system is an option to consider, if factory L31 horsepower / torque is acceptable?
Using a WBO2, I was able to "Tune" a 1995 Tahoe with a transplanted bone stock L31 to 260 RWHP using the Tahoe TBI PCM modified for MPFI.
dave w
I had no issues with the kit- but injector drivers were were an problem for some.
The injector drivers inside the 16197427 are SOLID ELECTRONICS! I would accept a more accurate statement: "some tuners have problems figuring out the INJECTOR PARAMETERS for the injectors being used."
dave w
I have never had an issue with the drivers themselves. I have only run across an issue where I had to bypass the current sense resistors to prevent the driver from going into hold mode used for the Peak and Hold TBI driving method.
That is a strong running bone stock L31. I have gotten 230-250 RWHP and 300-320 RWTQ out of them with headers and full exhaust and a very aggressive premium fuel only tune, but nothing more than that. That is running them at about 12.6:1 air/fuel ratio and 30-32* of timing advance. That amount of power is what I typically see out of tuned bolt-on B-car LT1s with 1.6:1 rockers, headers, exhaust, and an aftermarket air intake.
I haven't had much luck so for on finding an alternate mpi intake for vortec heads within budget plus the EGR issue, I do have a stock L31 intake that I could upgrade with the mpi injector spider and maybe an intake spacer plate, not sure how much they help? Would this work with my 6395 PCM?
The L31 marine intake would work with modification and a gen3 style remote EGR valve.
In-Tech might still have one.
Yes, the MPFI conversion will work with 6395 PCM. I'm using the MPI Spider on my stock L31 powered 99 S10 pickup, they work fine. I don't have experience with the spacer plate for the stock L31 intake.
dave w
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