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7730 for a RamJet 350 swap

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Old 04-20-2017, 10:02 PM   #1
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7730 for a RamJet 350 swap

Backstory:

Back in 2001 or so we swapped a ramjet 350 crate engine into my brothers 92 RS Camaro in place of the stock 3.1. Fast forward to 2017 and he's bought a 15 Camaro and given the RS to my Dad (who paid for the crate engine and all back then when brother was in high school anyway). Dad isnt a car guy so he's found a 67 C10 with a blown 283. We're going to pull the RamJet out and swap it into the c10, but also install a LT4 hot cam cause Dad wants a little thump at idle.

Anyway realizing the Ramjet ecu's suck for tuning, I want to use the 7730 still in the 92 RS. Ive done a bit of tuning on TBI stuff but PFI is all new to me. From reading on this site and gearhead-efi I've just managed to confuse the hell out of myself, LOL

Now for my questions:

1. I assume there will be no problems using the original 3.1 memcal azty as long as I jumper the netres to put it in 8 cylinder mode. I plan to install a new 27sf512 on the memcal like I did on the 7427 Memcals from my TBI swapped F150.

2. Can I use a memcal from a 7427 in the 7730, assuming I change the prom and possibly jumper the netres? I can find them in the junkyard much more easily here. That will have the 5.7 knock board at least, or does this not work at all?

3. Can I swap the 7427 knock board to the 7730 memcal at least, or is it easier to just remove it and use an external board. I already have an external board from a TBI truck. If I remove the knock board from the memcal how do I jumper it? I haven't found clear instructions for that with all my googling.

4. Finally assuming all this is even possible, can someone point me to a decent starting BIN for the 7730 for the ramjet, which is basically a 99 Vortec 5.7 so I can have a solid foundation to begin tuning from?
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Old 04-21-2017, 10:41 AM   #2
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Re: 7730 for a RamJet 350 swap

I'm not sure about questions 1-3, but on 4, you could probably start with my Miniram Start Bin.

Short runner, log-style plenum... my guess is the Ramjet manifold won't behave terribly differently than a Miniram (at least to the point where it'd more efficient to start with a Miniram bin than a TPI bin... especially when dealing with the accleration enrichment stuff, which is literally like black magic for these types of manifolds).
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Old 04-21-2017, 11:16 AM   #3
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Re: 7730 for a RamJet 350 swap

Thanks ULTM8Z. I assume the miniram start bin stuff is on your website linked in your signature? If so I will check that out tonight after work. That was my biggest worry, actually. Questions 1-3 were mostly seeking conformation that I had everything correct in my own head, LOL
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Old 04-21-2017, 12:11 PM   #4
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Re: 7730 for a RamJet 350 swap

I forget... if it isn't, PM me with your e-mail and I'll send to you.
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Old 04-21-2017, 12:13 PM   #5
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Re: 7730 for a RamJet 350 swap

Quote:
Originally Posted by Tim C View Post
1. I assume there will be no problems using the original 3.1 memcal azty as long as I jumper the netres to put it in 8 cylinder mode. I plan to install a new 27sf512 on the memcal like I did on the 7427 Memcals from my TBI swapped F150.
That will work. The limp mode calibration and knock filter won't be ideal, but it will work.

Quote:
2. Can I use a memcal from a 7427 in the 7730, assuming I change the prom and possibly jumper the netres? I can find them in the junkyard much more easily here. That will have the 5.7 knock board at least, or does this not work at all?
I'm not sure about doing this. I've never tried it or looked into the '7427 MEMCALs that much to know whether they will work or not in the '7730 ECM.

Quote:
3. Can I swap the 7427 knock board to the 7730 memcal at least, or is it easier to just remove it and use an external board. I already have an external board from a TBI truck. If I remove the knock board from the memcal how do I jumper it? I haven't found clear instructions for that with all my googling.
You can remove the filter from the '7427 MEMCAL and replace the one on the 3.1l MEMCAL. This I've done (and others) and it works.

RBob.
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Old 04-21-2017, 02:06 PM   #6
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Re: 7730 for a RamJet 350 swap

Thanks RBob. I may try the 7427 Memcal I have extra. If it doesnt let any magic smoke out then worse case I may just have to cut a jumper and it'll still work in my TBI 7427. If it works then it's already got the 5.7 knock filter.

Also, If I use the knock filter from my 7427 MEMCAL, I assume I use a matching knock sensor itself? I.E. one from a 93 c1500 5.7?
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Old 04-21-2017, 04:13 PM   #7
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Re: 7730 for a RamJet 350 swap

I'd stay with the stock knock sensor. Just check that it measures about 3.9K in resistance. The truck engines that use the '7427 PCM likely use the same as the '90 - '92 f-body 5.7l sensors.

RBob.
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Old 04-22-2017, 02:00 PM   #8
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Re: 7730 for a RamJet 350 swap

Appreciate the help. I'll start gathering parts for the swap. We're waiting for the title to come back on the truck before we pick it up, so far just left a deposit to hold it. Not too worried because the seller is a state trooper, lol.

ULTM8Z I sent a PM with my email address.
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Old 04-22-2017, 08:06 PM   #9
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Re: 7730 for a RamJet 350 swap

Yep I just emailed it to you.
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Old 04-22-2017, 10:34 PM   #10
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Re: 7730 for a RamJet 350 swap

Thanks again ULTM8Z. It's going to be a little while before I make use of the bin, I've still got to get the truck here and get the old 283 out of it and the ramjet out of the camaro, but I'll poke around tunerpro with the bin and get familiar with the new to me mask. Hopefully I can report back later this summer with good news.
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Old 06-11-2017, 07:08 PM   #11
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Re: 7730 for a RamJet 350 swap

Just to follow back up in case anyone searches this out in the future, I put a new eeprom 27sf512 on a memcal from a 7427 TBI PCM with the jumper installed just like the v6 to v8 memcal mod. It seems to work. I havent been able to drive the truck yet because it still needs exhaust and non dry-rotted tires but I cranked it this weekend, set the timing, then let it run until the cooling fan cycled on and back off. The only code I got was 44- lean exhaust which makes sense because the sensor is about 1" from the open collector for now.

Unless something crazy happens on the test drive, you can use a 7427 memcal jumpered in a 7730, which is great because there are a ton of the 93-95 chevy trucks in the local junkyards, but no 7730 equipped cars. Plus the 7427 had a knock board for a 350.

Ultm8Z's miniram start bin seems to be the ticket too for a Ramjet manifold vortec head 350. It fires up great, idles great with the lt4 hot cam and revs smooth with no stumbling or popping so far. It seems like its going to be a great foundation to begin tuning from.

Thanks for your help guys, Ill try to update again once its on the road and tuned in over the next few weeks.
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Old 06-11-2017, 07:44 PM   #12
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Re: 7730 for a RamJet 350 swap

Great news! I've actually gotten very little feedback on these Miniram start bins... glad to know it's doing some good!

Don't forget you need to tailor the injector flow rate, the injector PW vs battery compensation tables for your particular injectors.
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Old 06-11-2017, 08:24 PM   #13
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Re: 7730 for a RamJet 350 swap

That was my next step, I brought my nice fuel pressure gauge home from work this weekend and it's got a steady 45 psi with fuel pump relay jumpered engine off, the ramjet is supposed to have 24 #/hr injectors from the lt1 pn 17124248. I'll make those calculations this week while I wait for summit to ship the exhaust pipe to me.

I went through and selected all the manual trans options I could find and I set up all the setup stuff like base timing and fuel cut off. I adjusted the vss pulses to hopefully read my vss, which ill have to test when I can drive it I also played around with the fan on/off settings too get them where I wanted it for the initial start up. Now that Im armed with the acutal fuel psi i can make those changes and I'll be ready to stick my wideband on it in the extra o2 bung I added and go play.
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