TRACTION!!!!!!


MWHAHAHAHA!!!

She could probably get a better tune on the chip, but she's dialed in pretty damn close right now.

In case you haven't read any of the previous post:

87-95 350
Compumax 2030 (204/214, .429/.452, 116)
Trick Flow 23* heads
Edelbrock TBI bored out to 2"
2" throttle body w/ 55# injectors
Hooker black ceramic coated 2055's
Dynomax 3" catalytic converter and cat-back
MSD wires and coil
Crane HI-6 box
TBIchips.com chip
I also have some Magnum 1.6 RR's to go on eventually, but she's goes to the paint shop Monday.:lala:

Yeah, I know yall are jealous.

 

Way to go Gunny!!!!

How did you get the chip dialed in????

 

Brian at TBIchips.com did a real good job. I plan to take a long weekend and drive up there to let him do some hands on datalogging whenever the time is available.

Despite some of the people's here disdain for mail order chips, Brian is the best that I've come across and he'll get you runnin'.

 

Yep, I used him to get me going when I did my head and cam swap. I have no doubt that the best way is to do your own. But using Brian to get you off to a good start is not a bad option.

 

Make me jelous with real (non-gtech) track results.

 

no seriously though, traction is a problem. Hopefully it's just my trashed tires. Next up is some BFG KDWS, but I'm waiting for the car to get back from the paint shop. (pepper gray metallic )

I've already got an entire Spohn back end, so hopefully the tires are the weak link right now.

Just from me couting out loud (1-1thousand, 2-1thousand, 3-1thousand etc )she's still hitting 60 under 6 seconds, but she spins the tires all the way to 30 mph.


Here's an off the wall question though. . . what do some of yall think it would take (HP, torque, suspension, gearing etc) to run sub 5 second 0-60 mph times?

When the car is more broken in and done being painted I will get some dyno numbers for JPrevost.

 

HP needed depends on gearing and vehicle weight (and traction if that's an issue). You can do sub 5 sec 0-60 with about 350hp in a full weight thirdgen.

 

3.23's with a posi is what she's got. I drive on interstate alot, so I'm real hesistant about going any deeper.

 

55 lB injectors? is that not a bit on the small side? i wonder what the A/F ratio is at high RPM's /load?

 

its a real small cam. The peak fuel consumtion should be around peak toque. i would guess the motor is not turning high RPMs at all.

 

I would be jealous with a mid 12 second G-tech result (I know they arent very accurate, but that would still be fast enough to make me jealous).

 

Yep, this motor was built for massive low-end torque (eg 204/214 duration)

Maybe one day after extensive datalogging, I might go to 65#, but never bigger. I did what a good number of people on here suggested and got all the injector I could, but the damn thing would not even idle after repeated chip tuning. . . and it wasn't even close.

I just have a real problem paying twice as much for a 65# injector when there's nothing special about them.

 

The 55s will most likely be too small for your motor at the stock fuel pressure if you dont want high dutycycles/static operation. Stock injectors are seldom large enough for stock motors, let alone modded ones. Have you checked to see if the injectors are entering async operation? In the ALDL stream one of the status words transmitted has a status bit that says when the ecm is in async fueling.

 

OK, I didn't understand most of that, but they're running at about 20 psi at idle.

 

I've gotten my engine to idle with 28psi on 65# injectors (Delphi). If I can get it to idle there isn't any reason why chip tuning couldn't get your engine to idle... unless the tuner is trying to hit you up for more money ....

 

I understand what static injectors are and duty cycles, etc.
What is async operation though?

 

When the injector pulsewidths get too short, ie the time theyre to be open for is too small, the ecm will go into async mode since the injectors may not reliably open in synchronous fire with pulsewidths that are real short.

In synchronous fire, the injectors alternate firings and one of the injectors fires each time the computer recieves a reference pulse form the dist. In asnychronous mode both injectors fire at the same time 80 times a second. Basically the computer can have greater freedom with the fueling by skipping injector firings and saving up the pulsewidth untill it has enough to fire the injectors.

 

90#'ers aren't as easy as you might think to tune.

 

Its not so much tuning as its staying out of async. If its pig rich then thats more of a chip issue. If so then setting the BPWc correctly is really necessary in order to get the right pulsewidths.

 

How much you wanna bet?

 

maybe this should be a different thread BUT i pulled my injectoirs to determine what i have. i ordered (i thought (++++ 2560) which (i thought) were 90#.

part # engraved is 17084304. engraved number is same as part #?

did search. BMonte says 80 pph 11/2003

Brent says 6/2003 (++++2560) is best we have. states further there is a 90 lbs out there subject to discussion. further on it says they (2560) are 75 lbs (maybe at 10 lbs?)

i found a hit for late BB pickup with above part # referenced above at 80 lbs that shift provided.

issue is i ordered what i thought were 90's but it appears i have 80's. looks like i need to reset BPW and reapproach my tune.

 

Well, we're not all tuning guru's such as yourself.

 

The things that have to be adjusted when transferring over to larger injectors are:

The BPWc, so the ecm calculates the proper injector pulsewidth

Anything thats pulsewidth based, like AE. Although for those it should be inversly proportional to injector flowrate. Like if your goign from 45s to 90s in theory youd want to halve all your AE PW values to maintain the proper ammount of AE.

 

But if you've got a larger than stock intake manifold and larger than stock throttle body you'll want more than half of the original AE . See, it's not THAT hard to tune. It just takes getting your hands dirty so to speak. Once that's done you'll gain motivation which will in turn produce "good" questions. That's just the way things work at this level.