Cruising270

I have a 91 305 Z28, and I'm thinking of going for the ram jet 350. It seems like the best bang for the buck fuel injection engine. Now I just have afew questions about it before I do this.
1) What 1/4 mile times/trap speeds could I expect with everything else stock in the car
2)Can I still use my 700R4 or will there be any problems
3)Any fuel pump recomendations
4)Also any header recomendations

Thanks

FormulaJoe

Id say low 13s at 104-105mph with some good gears and good traction.

The 700R4 may or may not hold up. The Ram Jet 350 makes about 400ft/lbs. Ive seen some 700s that had problems holding up to a slightly modified L98 and Ive seen one stock 700 hold up to a super charged L98...so who knows.

For headers, just use any 3rd gen specific V8 header. They recommend a 1 3/4 primary for that motor with a freed-up exhaust system. (Thats what they say in the owners manual for the motor. They say the computer calibration is set up for a free flowing exhaust)

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L98, 3.27 9-bolt, Hooker shorty headers, custom 2.5inch Y-pipe, no cat, 3inch 2chamber flowmaster, JET AFPR, Ported MAF, Best ET: 13.86 @100mph. 1.99 60'
17 inch ROH "ZS" wheels. 17x8.5(front) and 17x9.5 (rear). Firestone Firehawk SZ50s. 245/45/zr17s and 275/40/zr17s. T56

On the way... Radar Blue 89 Formula, T56, Ram Jet 430, Ram Air, 17inch ROHs.

jase

I would say a new set of rear tires!!!

dmair5_0

I just gotta ask, why would you buy a fuel injected setup if you already have all the fuel injection stuff you need on your car now? I know everyone thinks TBI sucks, but truthfully you can buld a solid 350 HP car with a TBI. Don;t spend the extra cash to buy stuff you already got, save the money and use it on other components you can use to really make the car scream (ie. gears, posi rear, exhaust, whatever) You get what I'm saying? Hope this makes sense to ya.

Cruising270

I accually have TPI 305, not TBI. The thing is I called to alot of motor shops in regards to building up a 350 TPI and every place came out to about 10,000. Now I just figured if I can spend half the money and have a WHOLE NEW COMPUTER, WATER PUMP, FUEL INJECTION SYSTEM, it just sounds worth it. Plus most places said I'd be looking at about 320-350hp after all that anyway. Hell, the Ram Jet is supposed to be under rated at 350hp plus the torque is at 400ft lbs!!!!! It's a complete closed loop system so I'd never have to invest in DFI after supercharging it or stepping up to a more extreme cam. It seemed like a GREAT investment, and i heard they can take some abuse as far as adding a 100-150hp nitrious shot. I sell cars for Criswell Performance Automotive and we have the engines in out Pro Shop and everyday that RAM JET looks beter and beter

dmair5_0

Sorry about the TPI TBI messup, my bad. But really??? 10,000 to build a 350 HP TPI?? That seems really high to me, but I suppose an engine shop will charge you an arm and a leg for labor Well, hey, if you got the money, go for the Ram Jet and let me know how it goes!! It does look like a badass engine!

firbird

$4495.99 to be exact,, i say go for it

five7kid

iTrader: (14)

Not true. It's their marine open-loop system.

It also will not control your TH700 TCC lockup.

Cruising270

Ok I may be wrong on the whole meaning of open loop and closed loop. This junk slips my head sometimes

I thought.....
OPEN LOOP was when the computer used the map sensor, rpm, and throttle possition to determain the amount of fuel to spray, then it would ajust according to the O2 sensor. Thats why when your o2 sensor goes, you start running rich
CLOSED LOOP was where it uses no O2 sensor. So it'll never correct itself.

Basicly the reason I liked the Ram Jet was the compter is supposed to be programable. Out of the box its tuned for the engine, but if you put a diffent cam in it, you can manually tune it while on a dyno. This is what I was told about the engine at least.

FormulaJoe

If you find a way to tune this thing on a dyno, let me know. I had my MEFI3 computer reprogrammed for my fast burn heads, LT4 HOT cam, and 30lb/hr SVO injectors. AS&M did it. I think S&P may be able to do it as well, but not sure. To my knowlege, this is the only wasy to reprogem that MEFI3 computer. Hell, Ed Wright at Fastchip said he couldnt even do it.

In the future, I think I am going to switch my Ram Jet motor over to a 7730 SD computer and burn my own proms for it.

Let me know if you have any questions on this Ram Jet swap. I pretty much had to figure this stuff out on my own because nobody had tried it yet.

Grim Reaper

No, it's the other way around. Open Loop is when the ECM runs off tables (and sensors except the O2) and does not make any adjustments based on the O2 sensor. Closed loop is when the ECM uses the O2 sensor readings to adjust the injectors.

Thus it is critical to have the RamJet MEFI3 properly programmed if you make any alterations. You must do both part-throotle and WOT, since the RamJet does not rely on an O2 sensor for fuel corrections in part-throttle. That is also why it is not an emission legal swap except on older vehicles.

Swapping to an SD 7730 ECM would give you the O2 sensor to correct for part-throttle, ability to lock the TCC and the ability to tune your eprom. It's a shame that GM didn't make it a direct "plug n'play" for 7730 cars, it would have been very easy for GM.

92ramjetcamaro

I Originally had a 3.1 V6 in my camaro we decided we wanted to put a Ram Jet 350 the motor has been great but the transmission has been another the first 700R4 burnt up in one week (out of the donor car that had a 305 in it) the second one was a TCI street fighter and it is Slipping in second so we called TCI and they told us to look at at the servo and if it was sticking but if that didn't work check the inside of it and if we can't fix it send it back to Them and they will fix it for us so far the transmission has been the only problem with this setup but the motor itself is totally worth it I say go with it man