Search Results

Views: 3,015

Posted By Slewis

Re: Lean Cruise Alternative ??????

One thing I'm not sure about is the definition of the o2 error. Is it the timeframe from when the switchpoint gets crossed, and is moving away, until INT is able to add/subtract and bring it back...

Forum: DIY PROM

07-31-2008, 10:14 PM

Replies: 7

Views: 3,015

Posted By Slewis

Re: Lean Cruise Alternative ??????

I think it's either Dimented's or Haulin's interpretation of the OD hack using portions of the EGR strategy and open loop tables when in closed loop. My perticular code is BJLH, and from the way I...

Forum: Engine/Drivetrain/Suspension Parts for Sale

07-31-2008, 09:54 PM

Replies: 0

94 LT1 120k miles w/trans

Views: 290

Posted By Slewis

94 LT1 120k miles w/trans

Pulled from a running but wrecked-in-front Z28 that had too much damage to fix. I was going to install it into my truck before I found out what a PITA it was going to be. I'll keep my roller 383...

Forum: DIY PROM

07-31-2008, 05:21 PM

Replies: 7

Views: 3,015

Posted By Slewis

Re: Lean Cruise Alternative ??????

Not an option, right now it's my truck with all the WB stuff hooked up, but I'm setting it up for my nephew who will be purchasing the truck from me next month. The goal is to have him getting MPG's...

Forum: DIY PROM

07-31-2008, 04:00 PM

Replies: 7

Views: 3,015

Posted By Slewis

Lean Cruise Alternative ??????

I have been unable to get Lean Cruise to work for me, so I have a theory about an alternative to lean cruise that needs test subjects to see wether it will work or not. Those of you who have a good...

Forum: TBI

06-01-2008, 09:35 PM

Replies: 53

Important/Useful : TBI MAF code and FAQ

Views: 32,313

Posted By Slewis

Re: TBI MAF code and FAQ

When you say reworked for wetflow, does the airtemp sensors placement (upstream/downstream from TB) have any bearing on the codes operating characteristics? I have mine in the manifold right under...

Forum: Alternative Port EFI Intakes

04-01-2008, 11:30 AM

Replies: 36

HSR and AFR heads inside

Views: 4,362

Posted By Slewis

Re: HSR and AFR heads inside

They were summits brand/badge, but are made by Brodix as the IK200's. Identical heads. You have to use a race style manifold with bigger ports.

Forum: Alternative Port EFI Intakes

03-12-2008, 06:55 AM

Replies: 36

HSR and AFR heads inside

Views: 4,362

Posted By Slewis

Re: HSR and AFR heads inside

Ran into that exact problem with a set of brodix heads. The ports were so big the intake woudn't cover the hole. Huge ports. I doubt you'll find a fix other than a different intake, wich if the ports...

Forum: DFI and ECM

02-08-2008, 02:25 PM

Replies: 4

Min Pulse Width

Views: 865

Posted By Slewis

Re: Min Pulse Width

Here's a pic of two different pulses one after another at what I believe is the switch point from synch to asynch. The first is about 8-9 msecs to current peak and the second is about 4 msecs. What...

Forum: TBI

01-29-2008, 04:51 PM

Replies: 2

ACTUAL inj. flowrate

Views: 630

Posted By Slewis

Re: ACTUAL inj. flowrate

Good point, think my a/c scale is perfect for the task. Now to find a decent beaker........

Forum: TBI

01-29-2008, 01:55 PM

Replies: 2

ACTUAL inj. flowrate

Views: 630

Posted By Slewis

ACTUAL inj. flowrate

Due to all the inconsistant responses to my Q's about FlowRates, I was thinking about testing my injectors myself and was wondering if my approach would be the right way to go about it. I'm thinking...

Forum: TBI

01-25-2008, 01:42 PM

Replies: 23

Views: 1,485

Posted By Slewis

Re: BBC Injector Part#'s

There must be a flaw in my programming I've overlooked. My injectors are part#17084304 from a 93' 454 TB. If they are rated at 75#@12psi then they should be 101.5#@22psi (where I have it) wich makes...

Forum: TBI

01-24-2008, 05:03 PM

Replies: 23

Views: 1,485

Posted By Slewis

Re: BBC Injector Part#'s

OK...This is the way I understand it, correct me if I am wrong.

In SYNCH firing strategy the injectors are fired by the DRP (distributor reference pulse) wich in my case(V8) is 8 pulses in a 360...

Forum: TBI

01-23-2008, 09:44 PM

Replies: 23

Views: 1,485

Posted By Slewis

Re: BBC Injector Part#'s

Soooo.....Are the injectors rated @ 80% of the 12.5 msec asynch strategy and 12 psi, or something different ?

Forum: TBI

01-23-2008, 03:23 PM

Replies: 23

Views: 1,485

Posted By Slewis

Re: BBC Injector Part#'s

All those #'s are meaningless if I don't know what firing strategy the pcm uses in Asynch. I've been told it is a non referenced 12.5 msec interval, wich puts 90% DC @ 10.7 msecs. Would love...

Forum: TBI

01-23-2008, 02:04 PM

Replies: 23

Views: 1,485

Posted By Slewis

Re: BBC Injector Part#'s

So using that sights info I find that mine are 11-93' 129 ml/cyc

Injector sizes: (in ml/cycle)
350 CFI Rear: 114
350 CFI Front: 111
350 2bbl truck: 103
454 2bbl early: 124
454 2bbl late: 129...

Forum: DFI and ECM

01-23-2008, 01:58 PM

Replies: 1

MAT

Views: 631

Posted By Slewis

Re: MAT

Found my answers in the hack, but also raised more questions. How and how much do the Coolant vs MAT/IAT tables apply to the AF calc?

Forum: TBI

01-15-2008, 04:42 PM

Replies: 24

Views: 2,129

Posted By Slewis

Re: Help with 383 tune....no time!

OK, so I arrived @ 25 psi and 75#'ers to get my commanded 12.5 AFR on WB @ 5600 wich is my shift point. Injector constant based off of Witchunter's flow calculator appears to be close enough to what...

Forum: Tech / General Engine

01-11-2008, 07:28 PM

Replies: 5

Spark Plugs

Views: 1,223

Posted By Slewis

Re: Spark Plugs

Actually it's more like my tune is ridiculously out of spec.Too much fuel makes an engine chilly. Ended up going with Delco platinum rapidfire #9's.

Those cross reference charts are like...

Forum: DFI and ECM

01-11-2008, 12:14 PM

Replies: 4

Min Pulse Width

Views: 865

Posted By Slewis

Min Pulse Width

What is the absolute min. timeframe for a P-n-H TBI injector say at 13-14 volts?

Forum: DFI and ECM

01-11-2008, 10:23 AM

Replies: 1

MAT

Views: 631

Posted By Slewis

MAT

I use the a 94' c/k pcm w/ OD mask that has MAT table. All the tables are set at 1. There is no MAT sensor,or IAT sensor as far as I know. How are these tables affecting the AFR and where do the #'s...

Forum: TBI

01-11-2008, 09:08 AM

Replies: 23

Views: 1,485

Posted By Slewis

BBC Injector Part#'s

Anyone have a list of a few of the part#'s from the tops of 454 injectors and flow rates to match? I have a couple of sets with no visible color code.

Forum: TBI

01-10-2008, 10:32 AM

Replies: 7

Stalls after about 8 seconds into gear

Views: 807

Posted By Slewis

Re: Stalls after about 8 seconds into gear

Ended up changing injectors due to high rpm fuel issues, wich interestingly enough fixed that problem but created different ones. Fast is right about the code 33,and when mine would set I coudn't...

Forum: DIY PROM

01-10-2008, 07:58 AM

Replies: 61

PRP stuff. Need help, please :)

Views: 3,055

Posted By Slewis

Re: PRP stuff. Need help, please :)

Key ON engine OFF. Give the sensor time to heat up then check the reading & see if it's close to 450mv or higher towards your 800mv.

Scratch that, don't know what I was thinking. Was trying too...

Forum: TBI

01-09-2008, 11:05 PM

Replies: 10

Views: 2,367

Posted By Slewis

Re: Fuel Pressure Regulator

Found the part at SDP but no picture. Is it both vacuum regulated and manually adjustable?

Forum: TBI

01-09-2008, 02:55 PM

Replies: 24

Views: 2,129

Posted By Slewis

Re: Help with 383 tune....no time!

Not really that funny from where I am, thing all but blinded me :eek:!!!!!
I had such high hopes for my TBI setup and wasn't dissapointed on the max power I was able to achieve. 0-60 in under 6...

Forum: DIY PROM

01-08-2008, 01:12 PM

Replies: 61

PRP stuff. Need help, please :)

Views: 3,055

Posted By Slewis

Re: PRP stuff. Need help, please :)

What is your NB02 mv reading KOEO after sensor warmup?

Forum: TBI

01-06-2008, 10:42 PM

Replies: 24

Views: 2,129

Posted By Slewis

Re: Help with 383 tune....no time!

After the injector swap and fuel pressure increase I now realize why I should have gone MPFI. For a first timer, tuning in SD, the combo I have is taxing to say the least. To get the fuel right on...

Forum: Tech / General Engine

01-06-2008, 10:13 PM

Replies: 5

Spark Plugs

Views: 1,223

Posted By Slewis

Re: Spark Plugs

Thanks for the CHAMPION website info,but have that already. Guess I generalized the question so I'll be more specific. Going from IRON heads with same combustion design/cc to ALUM, what if any plug...

Forum: TBI

01-06-2008, 09:56 PM

Replies: 10

Views: 2,367

Posted By Slewis

Re: Fuel Pressure Regulator

Thought that was what you meant BMmonte. If I were any better at math I would try to log the pressure increase/vacuum decrease vs. TPS timeframe, apply that to my inj output calc,and apply that to...

Forum: Tech / General Engine

01-05-2008, 11:08 AM

Replies: 5

Spark Plugs

Views: 1,223

Posted By Slewis

Spark Plugs

Is it reasonable to think that with running aluminum heads the spark plug heat range needs to be raised due to the better transfer rate of the aluminum? And if so what is a general rule of thumb?
...

Forum: TBI

01-04-2008, 07:38 AM

Replies: 24

Views: 2,129

Posted By Slewis

Re: Help with 383 tune....no time!

Well it appears it's a pressure issue not PW, pattern looked good w/ 6.4 msecs clear up to fuel cutoff @ 6000 with room to spare. Put a pump in it awhile back but coudn't remember wich one so I...

Forum: TBI

01-01-2008, 06:43 PM

Replies: 7

Stalls after about 8 seconds into gear

Views: 807

Posted By Slewis

Re: Stalls after about 8 seconds into gear

If not mistaken the code 33 is there becuase you have insufficient vacuum for idle conditions, usually sets right before or during the stall. Kept happening to me while I was trying to tune idle...

Forum: TBI

12-31-2007, 09:42 PM

Replies: 10

Views: 2,367

Posted By Slewis

Re: Fuel Pressure Regulator

What do you mean when you say the injector size is moving all over the place ? Also what year model & platform do you speak of for the adjustable regulator?

Forum: TBI

12-31-2007, 10:30 AM

Replies: 10

Views: 2,367

Posted By Slewis

Fuel Pressure Regulator

Who makes a decent vacuum adjustable regulator that fits in the stock TBI location?

Forum: TBI

12-30-2007, 11:11 AM

Replies: 24

Views: 2,129

Posted By Slewis

Re: Help with 383 tune....no time!

Any Feedback ????????

Forum: TBI

12-29-2007, 09:32 AM

Replies: 24

Views: 2,129

Posted By Slewis

Re: Help with 383 tune....no time!

Playing around with the numbers this morning it started to make sense. Based on what Bmonte said about Asynch firing every 12 msec, that would be the reason for max Asynch PW being 11.9 in my stock...

Forum: TBI

12-28-2007, 05:10 PM

Replies: 11

TBI fuel spray problems

Views: 1,405

Posted By Slewis

Re: TBI fuel spray problems

A no-start due to no spark/inj. pulse could be multiple items. Power to ECM,coil,ign. mod, to start with. Followed by reference in to ign module from pickup coil on distributor,and out to ECM. You...

Forum: TBI

12-28-2007, 04:21 PM

Replies: 24

Views: 2,129

Posted By Slewis

Re: Help with 383 tune....no time!

I kinda figured that was the only option @ this point. But who makes a decent reliable VAFPR. My attempt at it didn't fair to well, I modified a stock regulator wich was able to compress the spring...

Forum: TBI

12-28-2007, 06:54 AM

Replies: 24

Views: 2,129

Posted By Slewis

Re: Help with 383 tune....no time!

Thats kinda why I was trying to do it with the 61's, now my idle PW is under 1msec @ idle but it still seems to be idleing well in spite of the spray pattern.
It appears if 5 msecs is max @ 5500...

Forum: TBI

12-27-2007, 07:58 PM

Replies: 24

Views: 2,129

Posted By Slewis

Re: Help with 383 tune....no time!

A few questions I have about the TBI inj firing scheme is whats the difference between synch & asynch, and the relavance @ wich RPM it swiches over?
Also the max asynch BPW constant is listed @ 11.9...

Forum: TBI

12-26-2007, 10:50 PM

Replies: 24

Views: 2,129

Posted By Slewis

Re: Help with 383 tune....no time!

Could only get 16 psi out of stock regulator. Plenty of fuel below 3000, way lean above 4000 @ 12+ msecs. New inj way rich down low(10:1) & still lean above 5200(13:5) but lower PW's (6), still...

Forum: Engine/Drivetrain/Suspension Parts for Sale

12-26-2007, 10:31 PM

Replies: 0

94' LT1 complete w/trans

Views: 307

Posted By Slewis

94' LT1 complete w/trans

85 K on motor, not sure about trans as it's a SRTA. $1500 takes it all,will deliver locally within 100 miles. No need now that I have OBDII vortech MPFI.

Forum: TBI

12-26-2007, 10:11 PM

Replies: 24

Views: 2,129

Posted By Slewis

Re: Help with 383 tune....no time!

Well as it turns out to my suprise those holes weren't big enough. The new adapter allowed another 3 kPa. PIC's show new opening transition that really didn't affect idle stability like I had feared....

Forum: TBI

12-21-2007, 09:52 PM

Replies: 24