Fast355

iTrader: (2)

Well, earlier this week, I sold the 1994 G10 with the TPI 305 and took a different van in partial trade. He needed a reliable cargo van, I wanted a newer conversion to drive in order to keep the miles off my 1983. So I ended up with a 1991 G20 with a shade under 100,000 miles on the clock. Knowing me it didn't stay stock long.

I have 1/8 mile times for an essentially STOCK 1991 TBI 350 Conversion Van (1" open center TBI spacer, TBI mods, 14x3" open element, newer monolith style cat, flowmaster 50 series single in/dual out, 68 lb/hr injectors, 8746 ECM, ANLU prom, and IAT sensor), before and after a custom chip, using the $61 Mask, the stock .BIN was for a 1991 9C1 350 and the 350 has the 68 lb/hr injectors to match. 350-700r4-3.08s-P235/75/R15s

I drove the van there on my HOT tune and ran off a pass straight from the road. I then went to the pits, swapped in the chip burned to stock. Pulled up and ran another pass. The engine was noticeably cooler on the stock chip. The first two runs ended up being the quickest. Idiots started pulling street tired cars through the water box. The next run was a 13.033 @ 57.55 with a horrid 3.221 60', basically spun through first and into 2nd.

I am car 881

Car 867 was a 1989 C1500 truck with a regular cab short bed and a 350/700r4/3.08/ P295/50/R15 combo. It had shorty headers, loud duals, and an open element air cleaner.

HOT chip/210*



Stock chip/180*

Dyno Don

iTrader: (7)

Man....that baby must have pushed you back hard in the seat (cough, cough)

flaming-ford

iTrader: (7)

Wow your posts just make me lose brain cells. maybe you should stick to tpi since that's what you're good at, and leave tbi to those like fast355, dimented, shifty and so on that realy know their stuff about tbi's

Most of your posts hurting tbi's credibility is questionable at best but, this post was just plain ignorant.

think before you post.

Anyways fast thats an unbeleivable time for a stock 350 tbi on a 5,500 lb brick. Kind of confused by which tune you used at the track your *hotter* tune or the stock styled.

Fast355

iTrader: (2)

Thats about normal

The First run and top time slip was on the "hotter" tune and the second run, bottem time slip was from the stockish styled chip. The engine was noticeably cooler after the first run and cooling down while swapping chips. I drove to the track, sat with the engine idling (A/C on) at the gate, waiting to get in, then drove straight to the staging lanes, turned the A/C off, waited about 3 rounds, cleaned the tires off with a little burnout, then pulled up to the lights, and off I went.

I think I could have gotten it into the 10s pretty easily. The 60' was horrible due to the right rear tire spinning off the line (worn out G80 Govloc and TINY P235/75/R15 tires). The WOT shifts are occuring at about 5,500 rpm, which is about 700-1,000 rpm above peak HP. A cut-out in front of the cat to eliminate some back pressure. About 4-6* more timing with better gasoline. It was pinging on 87 octane E10 gasoline. The next step is to rectify these problems, play with the tune a little more, and do a complete tune-up on the van.

83Chevy_Camaro

UM, my stock 350 TBI swirl port heads, Lmted slp 2:73's out back.. I ran a 9.34 in the 1/8 last weekend with a 2.002 60ft, no weight reduction or anything stock suspenion... I hope to hit the 8's with some suspension and exhaust upgrades..

BronYrAur

iTrader: (1)

There's always somebody...read the beginning of his 2nd paragraph.

Pretty good pickup from a quick chip change, I'm curious to see how much more it goes up when you tune it up and do what you listed in the last post.

ps. Fast, I hate you for how often you get to the track, I'm currently 130 miles away from my car and it's killin me!

Fast355

iTrader: (2)

Im 30 minutes from the 1/8 mile track, Kennedale and about an hour from the 1/4 mile track, Ennis.

kdrolt

I think Don was poking fun at Fast355, a fair game given the 11 sec timeslip in the eigth mile (albeit in a 5300+ lb Gvan).

And for the record, Dyno Don has done some very useful tests on things like: TBI vs TPI, and was probably the first here to attempt porting on the so-called "junk" swirl port heads. IOW he's helped to prove or disprove some of the standard sbc myths.

flaming-ford

iTrader: (7)

Yes i've read most of his stuff and i find it quite informative and usually pretty accurate. I just think he tends to be quite bias on most things he posts on the tbi forum, which is why i think he should stick to his area of expertise (tpi) and leave tbi to these guys.

Anyways i think considering wot points are so high and what you consider a terrible 60 foot time thats damn good considering the factory output of that engine and the fact that it's a 5,000 lb not so aerodynamic hunk.

Fyi my tired 305 tbi in a very well in tune lo3 was only able to nail down high 2.4 60 footers with 2.73s so i think that's not quite as terrible as you say considering what you're running.

83Chevy_Camaro

Whats wrong with my last post? i was just throwing out my "Stock TBI 350 Track Time(s).." as thats the Title of the thread.

Swirl port heads are not a performance head. they are made for Low end torque and Fuel Economy.