So here's my dyno results from March of last year:



Power: 191.2 hp
Tq: 245.4 lb ft.

These power numbers are a little misleading, but valid for the argument. When I checked my base timing it read 0* and I had it set to 6* in the prom, so the timing was basically set 6 degrees atdc. This dyno run was done with a little bit of prom tuning, but not a whole lot. I was never able to iron out that wierd dip at ~4500 rpm with the stock injectors which led me to believe the PW's were too high, but I never verified that through the ALDL stream.

Since that dyno I've added nothing but larger injectors, tuning and an aluminum driveshaft. When I went to dyno again this year (March 4th about a year later) I was surprised. My air fuel graph was solid at 13.0 then shot up to ~14.7 on the dyno wideband, while my wideband stayed solid at around 13.0...I had been lied to. Even though the car was lean and mean, it still put down 208 hp this pull. After seeing this and arguing with Keith at ADC as to whose WB was lying, I added a buttload of fuel and picked up another 5 hp but unfortunately I ran out of dyno time and couldn't fine tune it. Because we did a few back to back runs, the heat of the engine seemed to burn the fuel fine, but when I did some runs on the street on a semi cold engine, a misfire was really prominent.

I stuck the car back on the dyno a week later or so and the misfires were clear as day. After leaning it out a little more the misfires were gone. All this time I had my timing at what I believed to be 31* total, so I went to add a little more after the fueling was cleaned up...no change...so I backed it down to 29* and it picked up power. I did it again, and once again the car picked up power, did it again, no change, left it alone. I think the total timing right now according to the prom and harmonic balancer is 27* so either my balancer has slipped or I bought the fastest burning LO3 heads in history. So I guess the moral of the story is 1) tune your car 2) don't always believe what your instruments tell you, use the tune that produces the best results 3) Dynos are a great tool, but keep in mind that trap speed, G-tech times and seat of the pants can be equally as useful. The guys at the DIY-PROM board have been saying this stuff for years, I just wanted to offer a little bit of thanks to them and a little evidence for their fight so thanks guys!


Green - First dyno pull with a surprise that my wideband is a lying SOB
Red - Cold dyno pull after the "10 minute tune" aka "richen the thing up!" with evidence of the misfires
Blue - After an hour on the dyno, playing with fuel and timing (still needs some AE work)

Car Mods:
Stock block/bottom end
Stock heads
Stock T-5
Stock Clutch
Stock throttle body with ult. TBI, inj. spacer
.5" TBI spacer (nitrous plate)
Edelbrock Performer Carb EGR with adapter plate
1995 LT1 Cam with Z28 Springs
Full MSD Ignition
SLP 1 3/4" Headers (too big...umm yeah!)
Exhaust Cutout after Y-pipe
LS1 Aluminum Driveshaft
3.42 Rear
Techedge Wideband, Prominator Pro
216 rwhp, 266.78 rwtq

By way of comparison, Chevy High Performance's stock 97 Z28 put down 218.8 rwhp and 254 rwtq. This is from 45 more cubic inches, GOOD flowing aluminum heads and a very good intake design. Kinda depressing that after a ($40) cam swap, intake and full exhaust my car is as powerful as a stock car from a few years later

 

Oh and just wanted to add that this is in crappy phoenix with crappy DA's and crappy gas unlike all you east coast cheaters

 

Kick *** man!!!!

28 HP and 25 ft/lb on a car with mild mods. Tuning is the KEY, just imagine how crucial it would have been if you had gone with a bigger cam.

As for your misfires, I have a sneaky suspicion you were exceeding your injector duty cycle. My engine went way rich when I went static. It sounded like a pretty nasty constant missfire when it happened. I did the same thing as you and backed the fuel off a bit and everything came back into line. What FP are you running? and have you put your injector PW into your ALDL stream yet?

 

dude tony you live in phoenix! wanna take a trip to kingman to teach me how to tune?I'll pay your gas money and hotel fair for that much increase.I wonder what I would get because I have a few more mods than you.Hmmmmm?

 

27-30* is definately in the range as far as timing. My crate L05 350 runs the best at 28* timing advance all in around 2,800 rpm.

Tuning really is key to unleashing the power of a TBI engine. Tuners have been trying to spread this for a long time.

I bet this thing screams for a TBI!

I haven't dyno'd my new combo yet but have run it in the 1/4. But for a stock L05 it is strong. I have tuned on it for a while as well.

The other benifits of tuning are, much better mileage, and decreased emissions.

 

Unfortunately I haven't patched the code to spit out the PW yet . I'm running ~ 14 psi on 55 lb/hr 350 injectors (probably should have put that up there). My ALDL stream is coming out all garbled, I think I need to invest in a good cable rather than the crappy one I bought 4 years ago. I DEFINITELY agree that the LT1 is a baby cam, if I were to do it all over again, I'd play with a ZZ4 cam.

Fast, good luck with the new combo man, I haven't been keeping up with the latest news on it, but if it's on par with the previous buildups I'm going to make sure to keep my eye on it.

 

Chalk another one up who modded his TBI correctly. These are the exact results that we need to show the nay sayers. Good job.

 

sniff...sniff is that a sticky I smell???

 

Ok I have a moded L03 TBI engine. I have a hypertech streetrunner chip in it right now. I know that it is not helping much, but I don't want to buy all the hardware to make my own chip. So I am asking if someone could make me one and how much. I will list my mods. The car is actully suprisingly running pretty good right now, but I know I will get a lot more power will a custom chip. So could someone help out here?
Thanks

 

No one will be able to give you a mail order chip. Even if they know your mods. All cars react differently and the chip tuner needs to have the car in their hands. It is no different than the Surgeon trying to operate on you over the phone. They know what they are doing and what is worng with you but you need to be in their hands to fix you.

 

Well could you tell me somewhere to go near Van Wert, Ohio 45891 thats tunes tbi.
Thanks