Fast355

iTrader: (2)

This is just the temporary engine until my 396 small block with a single plane manifold MPFI setup is done. Running on the TBI PCM and $OD code using a mostly stock CPI 4.3 tune. Runs OK for what it is. 305 Vortec shortblock bored .030", flattops, ported 187 swirlies, production LT4 cam, Thorley Tri-Y headers. I'll get some pictures of the finished swap. Still had to clean up some stuff when I first started it.

flaming-ford

iTrader: (7)

highly impressive. Nice job fast.

whats your first impressions of it on the street?

curious if you have any road data on that big beast of a van,

i remember reading numerous other posts of your 305-350 builds that were also pretty outragous, once again nice job keep up the good work.

Fast355

iTrader: (2)

I think it runs pretty good (she gets up VERY GOOD for a 5,500lbs girl). Kinda hard to compare with the top-end HP nature of my old 350 Vortec, but it does well in the low-mid range with the TPI and the very conservative production LT4 cam. I am still pulling timing out of the tune as it is still getting run-away knock counts right after the transmission upshifts. Its definately knocking, it knocked so bad I could hear it the first WOT 2-3 shift it made. As I pull timing, it gets quicker and pulls harder.



PS- My speedo is about 5 mph slow because the P295/50/R17s are larger diameter than the stock P225/75/R15s.

Still waiting on Photobucket.com. Atleast its faster than Youtube and the audio stays in synch though.





Right after I did that, I had a police car come flying up on a side street a couple of blocks up. Took a look around. I passed right on by. If I had been in a Camaro he would have had his lights on and been behind me.



Babying it a little up the steep on-ramp. Caught up with the guy in front of me and had to let off. I got some wheelhop on that moderate launch. My comment was because I thought it was just going to sit, spinning tires. It fought for and achieved some traction though and picked up and went.

Fast355

iTrader: (2)

Combined two post

scuzz

It sounds like a fun hauler. Keep up up to date.
Ron

Fast355

iTrader: (2)

Tuning is well underway on the TPI 305. Driven it over 200 miles in the last two days. Logged it almost all of that. The VE table is shaping up nicely as is the timing table. 20* total advance @ 3,600 rpm is as much timing as the 187 swirl ports want pulling the heavy van around.

rockit

iTrader: (3)

so wait tpi 305 is running on the new pcm? is that sequential fire on all 8? and combination maf map?

Fast355

iTrader: (2)

Its a 1993-1995 TBI PCM running in MPFI mode. Its still batchfire, but can support a MAF and an electronically shifted transmission(4L60E). Much easier swap than the OBDII, but still a powerful PCM.

Fast355

iTrader: (2)

Just thought I would put up some of the pictures that I made while doing the swap. I also got the hot start and idle roughness sorted out. This BEAST runs AWESOME. Went on a 623 mile trip this weekend. 29.4 gallons into the tank when I got back. 21.1 MPG driving the "BRICK" 70-75 mph.

YES- Those are TWO PCV valves you see in the pictures.

Fast355

iTrader: (2)

Dyno'd the little 305 on a Mustang Dyno yesterday. Made decent numbers, IMO. Keep in mind that I have a power hungry 700r4 w/2,600 rpm stall and massive 9.5" corporate 14-bolt rear-end out back. I spilled coffee on the dynosheet so I had to take the results and load them into Microsoft Excel to get a graph.

240 RWHP/.82 = 292 FWHP @ 5,000

329 RWTQ/.85 =387 FWTQ @ 3,600

I love the torque the 10.5:1 310 can make with the Ported Swirl Ports, Production LT4 cam with 1.6:1 rockers, Moded LTR TPI, and Tri-Y headers. That is healthy 350 like torque from a lowly 305.

theimpaler68

iTrader: (1)

this is awsome i have very much enjoyed this thread. kudos fast355.

rockit

iTrader: (3)

wow man, that's pretty nice! and i like the flatness of your power curve, not very "tuned" looking.

so on a 350 with l98 heads what would that powercurve look like? we'd be talkin 400+ at he flywheel on tq, and about 265-300 hp?

Fast355

iTrader: (2)

I would hope the 350 would make more than 400 TQ at the flywheel, since I am around 390 with only 310 CID. I would expect 325 HP from the larger 350 too, but I am an optimist.

KrisW

iTrader: (5)

I like the two PCV valves, I have been doing that a while now.

Where does your clean air go into the crankcase? I couldn't quite see...

On my Olds engines with one PCV per bank, I run a K&N style at the oil fill cap.

Fast355

iTrader: (2)

I don't admit fresh air at all into the crankcase. I measured and the crankcase was at about 6 in/hg of vacuum at idle at the dipstick tube. It increased to 10 in/hg when the engine was slightly loaded against the transmission. The little trace oil leaks (more like seeps) that I had disappeared.

KrisW

iTrader: (5)

The last time I did it that way, I sucked in the oil pan and valve cover seals. It didn't leak due to the vacuum but it did allow dirt to get in. I still have no oil leaks when I put the filter on the oil filler tube. I also like the way the engine runs with negative pressure in the crank at all rpms.

My Buicks and Pontaics get one PCV in the valve cover, one in the back of the intake (factory location) and then the filter on the opposing valve cover.

I have not done this to a chevy (I don't keep them long enough) but if you get to the point that you need air in, I think I would put both PCVs in the same valve cover and the filter on the other side.

Good luck and keep tabs on those oil seals!!

Fast355

iTrader: (2)

My chevy has the factory 1 piece oil pan gasket and the center bolt style valve covers that cage the gasket in the valve cover. The seals are not going anywhere. I did this for 20K miles on the previous 350 and never had an issue.

Thanks for the tip though.

Vans are pretty limited on breathers though. If anything, I would put one of the small breathers in place of the oil fill cap on the oil filler tube.

Fast355

iTrader: (2)

Well, decided I would play with the ECM that was running the TPI setup some. I repinned it back to the old TBI ECM configuration. I first put the Edelbrock MPFI bin in a 7747, with a few tweaks, it ran pretty good. I then swapped over to RBob's EBL. Fired right up and I have been tuning it in open loop. I am still running open loop and prefer it to closed loop. Runs VERY well now. Attached are some pictures from my trip this morning. I even have two from a WOT 2 lane passing manuever around this dumbass that decided not to let me pass him. Slightly uphill, I ran 67 to 87 in about 9 seconds. Not bad for a 5,500 lbs G20 van loaded down with about 1,000 lbs of crap and only a 305 with 3.08 gears. The MPG display is accurate to about 1/3 MPG in my testing, and shows for the 70 miles that I obtained 14.6 MPG. Keep in mind that if you saw the datalog, you would realize that I ran most of the trip at 80-85 even 90 mph, with WOT accelerations up to cruising speed. As it warmed up in the late morning, I turned the A/C on too. I am not complaining the least. Idles smoothly, has good throttle response, pulls hard, plenty of acceleration, even loaded.

zipfast

iTrader: (2)

Fast: Do you even have a thermostat in that engine? Or just a restrictor?
62c (143 F) after running for 1/2 hour on the highway!

Fast355

iTrader: (2)

That is just what it runs, even with a 170* thermostat. The thermostat rarely even opens, when it does, it sends the temperature dropping like a rock. It cools itself through the heater hose diverter and circulation through the passenger side radiator tank. In winter, I have to cover the radiator with cardboard to get ANY heat.

JohnBlazeLTZ

Man Fast...you continue to amaze me. I am just blown away with your newest creation. You just won't give up on that 305 will ya? Good for you man!

BTW...what happened to the 350 TBI? I notice it says "RIP 350" in your signature...did you blow it up? If so...under your hands...I am confident it was an "honorable" death! LOL...

KEEP UP THE AWESOME CREATIONS!!!!

JB

ScotSea

iTrader: (2)

Thanks for sharing this with us.

I am thinking about a very similar build. I have a 305 roller block, 30 over flat tops, a ZZ4 cam, the 305 vortec heads, a SD Vortec TPI intake, and the whole TPI setup. I was a little concerned about the final compression ratio, but it looks to be OK in your situation. I am going to put it in my 82 Malibu wagon, (200-4R, 3.08 8.5 rear). By the sounds of yours, it ought to be a fun little car!

Thanks again, Scot