1991sleeper

iTrader: (-3)

quick rundown just looking for a little help tuning this thing ... 1991 LO3 with stock bottom end balanced with all arp bolts and studs , sped pro hyper flattops 5cc reliefs 10.5:1 CR, trick flow 175 heads 56cc chambers , howards HR cam 214/218 @.050 268/270 ADV. .488/.495 lift on 114 LSA 110 ICL , 1.6RR comes to .520/.528 lift , comp short travel roller lifters, summit stage2 dual plane intake ported and center divider cut down, summit shorty headers 1.5 primaries 2.5 collectors ,2.5 Y pipe ,3" full exhaust into flowmaster crossflow .....dadalogs and bin attached

whatif3387

I took a look at the 2nd log and noticed that during your WOT run you were hitting way over 85% duty cycle which isn't good. As to why I cant really give you a definitive answer I'm sure others here can help much more then I. Based on my own experience your fuel pressure may be to low you didnt mention what pressure your running. Other things that can also cause this to happen are really big dips in the upper ve tables which you do have from what I saw. Your tables could also use some more work they need to be alot smoother with no sharp transitions. This is just coming from my own experience so I'm not stating any of it as fact besides knowing that you need to take care of the duty cycle issue. If you don't get any other replys here I suggest emailing your datalog and bin to rbob. Your datalog also didnt include the WB02 data. I've run into this issue myself on the laptop you recorded the datalog with you need to convert to a .csv to read in excel before moving the .dat file. If you email or post just the .dat file like you posted before converting it the WB02 data will be missing which is definitely helpful to have when reading a log.

Ronny

iTrader: (1)

your set up is similat to mine. I see EBL flash. I assume you have done multiple learns.
What drivability issues are you hoping to address?
Are you using the WB as a substitute for NB? Have you tried to tune with NB?

1991sleeper

iTrader: (-3)

I have wb and nb ... I'm not really having driveability issues just trying to get the most power I can out of my setup ... and get my fueling consistent ... I know my sa tables prolly need some work .. I'm fairly new to the whole tunning thing and just want it to b the best it can b ... fast 355 told me to start this thread in my build thread titled LO3 rebuild HP estimates

91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon

Ronny

iTrader: (1)

Tune so the AE ceases just after the PE begins in your logs with good launch. Change the A/F ratio in PE to allow the best MPH in 1320 feet. Same for SA adjustments in PE at same 1320. I am at 37 deg at WOT 100MAP at red line. Edelbrock RPM 64cc.

Or dyno time.

thomas1976

I am to lazy to open your bin but I will take a look at your SA main table and VE table if you can post a print screen of them.

Also need to know your current fuel pressure and injectors size.

1991sleeper

iTrader: (-3)

I'm running 68# injectors at 28 psi wot with VRFPR so it runs around 18psi at idle

91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon

1991sleeper

iTrader: (-3)

Any tuning gurus wanna help me get the last 10-15% outa this thing ?

91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon

Dominic Sorresso

Get rid of the Ypipe and shorty headers.

1991sleeper

iTrader: (-3)

Got a baby girl gonna b here in 3 weeks ... No spare cash ... I just want somebody to look over the tune n point things out I need to work on

91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon

Street Lethal

iTrader: (16)

Upload a datalog in .dat format, I will look at it in the WUD...

RBob

iTrader: (1)

For anyone wanting to look at EBL .dat data logs, the WUD programs can be downloaded from our web site. Be sure to use the correct one for the EBL system that created the log.

For the EBL Classic and EBL Flash, the WUD for looking at data logs is interchangeable. You can use either the EBL Flash or EBL Classic WUD for either system.

For the EBL P4 and EBL SFI-6 systems, need to use the WUD for that system. Note that they will each display the other systems log file, but some data may not be correct.

RBob.

Fast355

iTrader: (2)

Did not realize that you were not using a wideband. Just looking at the VE tables and the narrowband 02 sensor, the thing seems like it is probably running very rich up top. Also notice in one of the acceleration runs, something that looked like clutch slippage as the RPM was near 6,000 rpm.

1991sleeper

iTrader: (-3)

I am running aWB here it is in the same log I posted .. Huh ? ....

91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon

1991sleeper

iTrader: (-3)

91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon

1991sleeper

iTrader: (-3)

91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon

1991sleeper

iTrader: (-3)

I'll try in morning

91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon

1991sleeper

iTrader: (-3)

Any words of wisdom rbob ? .... I copied a lot of tables out of your 327 cu in bin it seemed to b a similar build

91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon

Fast355

iTrader: (2)

Oh..Just figured it out. I do not have a wideband configured in the What's Up display. What type of wideband and what channel is it installed on? Want to look at your air/fuel ratio.

1991sleeper

iTrader: (-3)

I'm using rbobs tt1 WB on Channel 0
And autometer 0-30psi .5-4.5v fuel pressure on Channel 1

91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon

Fast355

iTrader: (2)

Ok, got it all in place, notice several different things. Perhaps my XDF file V21 is behind the times. Is your whole 6375 RPM table on the VE table set to 0?

I noticed your AE settings allow far too much AE during the shifts. Also seems like your fuel pressure is bouncing around alot at WOT.

You are also dropping out of PE during the shift. I would set your PE TPS table values above 3,200 rpm to ZERO. This will keep the target air/fuel ratio at PE value during the shift. Then work on DE to help keep the air/fuel ratio from going so rich. Might also add some extra throttle follower at high RPM. Set your IAC MAX TF Steps from 160 to 255. This will help get you some more airflow through the throttle body at WOT. This will also help combat that rich spike when letting off the throttle by keeping the airflow greater.

1991sleeper

iTrader: (-3)

Thanks A lot fast ! I'll change the things u mentioned asap ! ... And my 6375 row is not zero ... I posted a few pics a couple posts back of sa and VE graphs

91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon

Dominic Sorresso

Fast,

Would you suggest maxing out the IAC at WOT even for an SPFI system? My MAP can be 100+ at WOT.
Are u using more TF at higher rpm to keep revs up during shifts?

Fast355

iTrader: (2)

Wouldn't hurt to try IMO. It can help keep the revs from dropping off as quickly and keep the mixture from spiking so rich when the throttle is closed.

Dominic Sorresso

Got it.

Fast355

iTrader: (2)

One other thing I suggest is looking at your rev limiter. Both SA reduction and Fuel Cut-off. I think I saw values of 7k. Not needed with a 6k shift point. I would pu the SA reduction to 6k and fuel kill at 6,200.fuel resume can be 5,900.

1991sleeper

iTrader: (-3)

Well I got everything suggested so far changed.. I believe IMA go to the local track tomorrow night so we will c what happens .. So I'll have a few more 1/8th mile datalogs with the current bin

91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon

thomas1976

SA table looks good how does it feel from 1000 to 4000 rpm? for curiosity do you have a pic of the VE tables too?

1991sleeper

iTrader: (-3)

Yea I posted pics of VE AE &SA all at same time do they not show up for y'all ? Its like post 15 in this thread ... And 1000-4000 seems ok I guess but it really don't start pulling hard till 4k and up ... A little more torque on the little end would b great ... The only lace I've ever seen ANY knock counts the whole time is the low rpm low map area around 1000-1500rpm and 25-45 map or kpa or whatever ... Low load not high load lol

91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon

thomas1976

Yes the graphic of the VE table are there but a pic of the VE table with the numbers would be great.

1991sleeper

iTrader: (-3)

Here is what I had at the time I started the thread recently made some changes about to post current ve next .. And I have done both WB and BLM learns











91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon

1991sleeper

iTrader: (-3)

91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon

1991sleeper

iTrader: (-3)

Well don't look like ima get yo the track this week .. Its been pouring down rain for 3 days on and off :-/ ... I wanna break 8.50 on street tires! Anyone think that's out of the question ?

91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon

1991sleeper

iTrader: (-3)

Bump

91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon

worme6

I have a set of the tfs heads and hooker 2055 headers to go on my 305tbi. Having to build in stages due to money. Can I put them on with stock program for 88 firebird computer or do I need to wait?

1991sleeper

iTrader: (-3)

About the most u can do with a stock tune is headers , full exhaust system ( go single 3.5" mandrel bent) intake and throttle body mods, and 1.6,roller rockers ... Them u still need to advance ur base timing from 0 to 2-6 degrees and bump fuel pressure to 15psi ... But a GOOD tune will bring out the most of any mods u make .... Soon as u change compression, heads, or can a tune is a must !!!!..and us gonna need to upgrade ur fuel pump for anything over 250hp ... Also I soul's go with a little biger can than I went with ... I'd say 220+@.050 intake ... And try to getí as close to .550 lift as possible to get these heads in their sweet spot lll

91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon

1991sleeper

iTrader: (-3)

And if the heads r gonna set for awhile u need to soak em in WD 40 n saran wrAP em

91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades. 24mpg @ 2500rpm hwy. 8.80@ 84mph 1/8th on street tires... 8.000's soon

1991sleeper

iTrader: (-3)

Bump

91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades......... 24mpg @ 2300rpm hwy 65mph ........ 8.63@ 85mph 1/8th on street tires... 8.000's soon

1991sleeper

iTrader: (-3)

Bump

91' bird 305 TBI T-5, trick flow 175 cc heads, 4.10 gears, lots of suspension upgrades......... 24mpg @ 2300rpm hwy 65mph ........ 8.63@ 85mph 1/8th on street tires... 8.000's soon