I looked back and couldn't find what heads your running. I'm very interested in your combo! I'm running a stock L05, 9:1, 195 202 cam. I think your on the right track, and would like to copy your set up, if thats OK? I'm also really excited at the thought of cheap fuel injection that could be swaped onto ANY car with a square bore manifold!!! I was under the impression that TBI sucked but now know that its just the engines under them!!! Could you please list your engine combo and any dyno information that you think is helpful? Thanks

 

I WAS running the 300hp 350cid iron heads that I had ported to the max, which was a TOTAL waste of money, IMO. I JUST put on set of mildly ported Vortec irons (like in CHP articles) for use down the road with the Hot Cam. Have the Hot Cam kit springs in there, too, with the XE250 cam and the HOt Cam kit's roller rockers of 1.6 ratio.

You can copy me all you want.

I have 9.0CR and "stainless" vette headers and true dual exhaust (quiet dynomax muffs instead of my Flowmaster, couldn't take it any more...) because I'm working on the Jeep now. Oh, Performer RPM Air Gap Vortec manifold with aluminum adapter plate for the TBI. OEM distributor/coil, for now, until someone convinces me of a plug-in ignition that is better. I want a 400hp TBI, dammit.

Then, I'll proably go blower with the 7747 ECU and MPFI in the late Summer/Fall. Either that OR another RamJet 502 is in order. That'd fit nice in my Wrangler, but my axles and trans will have to be upgraded, AGAIN. ouch=$$

This stuff is the only hobby I have left after having kids... Hve to keep at it because if i stopped, my wife would probably find a way to end it for me. Know what I mean? My boy is 2, now, and I do see some heavy go-kart stuff in the future. Briggs and Stratton EFI???

 

FastBroker, what about gas mileage by your engine, how big was it by different performance levels?

[This message has been edited by max87Camaro (edited March 27, 2001).]

 

Again, only Jeep Wrangler performance experience, guys.

194/214 cam:

245 hp
19mpg highway with 31x12.50x15 BFG All Terrains with 3.07's

15mph highway with 4.11's.

The 194/214 cam is VERY mellow but 245hp and TONS of low-end is respectful, to me. With the XE250 cam, the engine is still QUITE mellow and has tons MORE low-end torque and a little more entension on the upper end, but I also changed to Vortec heads/roller rockers in the process and need more fuel at WOT/5000rpm+ to get optimal results. Ask around, the XE250 is a VERY mellow camshaft.

[This message has been edited by FastBroker (edited March 27, 2001).]

 

FastBroker, At what point did you find a need to make changes to your ecm? To run the vortec heads did you just turn off the EGR function and go without? In your opinion what change or changes made the biggest improvement all around, not just horse power but the total "feel" of your engine. Thanks

 

I neeed to right away because I used different/non-OEM heads/intake/cam/exhaust/CRatio.

Things that helped the ME most OVER AN OEM PROM were, in order of MY importance:

Spark changes (Changed all aspects of spark curve)

Fuel table changes (entire table changed)

Pump Shot (transient response, like accelerator pump on carb) = driveability.


Your experiences will vary because your motor is surely different. Also, I mentioned SPARK as #1 because it made the most significant SOTP difference for me. yeah, the fuel changes did, too, but the spark cureve on the truck PROM was soooooooo mellow that it was terrible.

i did not mention EGR because of course it had to be eliminated if I was not using it. I had it activated for a while with no EGR hookups and it was ugly, especially for tip-in, and open-loop to closed-loop tranistion. Bad scene. Not a problem now. If you are running EGR with major engine changes, I am assuming that the Fuel Table (VE) and EGR prameters will ALL have to be worked on, ideally, to get it just right, bit I am no master at EGR/GM ECU work.

 

What was your donor motor from? My Lo5 is stock in a 1995, Z71, 5sp, 3.73s. I find that it runs a lot stronger when cold.(open loop?) Then slower when warmed up. Is this common in TBI and/or truck engines? I have enough money for a head swap or prom burning equipment. Would custom burning proms for the stock motor be a better place to start than heads? I've owned quite a few cars and trucks but am no expert. I think with a 350, 3.73s and stick this thing should run better than it does stock. I've bumped the timing to 4adv, bumped up the fuel pressure and did the usual tune up with new o2 and cts. Is there anything else I should look at to make sure its running correctly stock?

 

I am not a master of L5's and have NEVER worked on one or operated on one. My motors are almost NEVER donor motors but are usually crate motors or used race/qualifying motors.

The motor I talk of here is a, well, was a 300/350cid crate motor. It now has a ZZ4 crank, PM rods, flat top pistons, etc and the iron Vortec heads and XE250 cam with the DONOR TBI SYSTEM off a 90 or 91 GMC pickup, 350cid, 1227747 ECU, 1-11/16" bore TBI unit.

Again, I have NO experience with 305's as I have never seen the sense in building them. There are SEVERAL others here that can help you much better but I will say that you should do ALL of your configuration changes before you spend time/money on PROM work and stuff. unless you like to tinker/learn/make more hp, like I do.

Sorry my combo is of no help. i don't even know if my spark curves would help a 305 more than others have here, now. TBI curves, that is...

EDIT: I believe you are on track with advance changes and FP changes but config changes (heads/cams/etc) will make MUCH more power when combined with the proper PROM work, cam choice and gear selection.


[This message has been edited by FastBroker (edited April 02, 2001).]