V8Astro Captain

iTrader: (1)

I set the BPW const to 137 (was 135). I set the 2000 RPM VE #2 cell to 96 (was 100) and 2400 RPM VE #2 cell to 92 (was 100). I STILL have BLM's of 115 @ 2400 & 40, and all the way across the board they are 117's and 120's. I have been messing with this thing forever and pretty soon all I will have left are FREAKIN ZERO's!!!! I've taken all the advice given to me and I'm grateful that you put up wil my constant nagging, but what now?

Why after putting these performance mods on I find myself leaning everything out? There's no hot cam, or heads. Shouldn't it want more fuel?

WTF is going on? Can someone rationalize this for me, its worse than dealing with girlfriends, ARG!

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'92 Astro, GM crate 350, Performer TBI intake, MSD 6AL, 3.42's, 2.5" exhaust, Flowmaster 40 2 chamber, B&M 2nd stage shift kit, 255 60 R15 tires on AR-727's, Polished & Bored TBI, Custom EPROM in progress

JPrevost

I don't remember, what fuel injectors are you using and what is the fuel pressure? Those two factors can change a LOT of your values. I know that right now my stock eprom has a great light throttle and I have only 65 injectors on a 330hp engine. Obviously I needed to change a few things but the constant and fuel pressure stayed near stock. Even had to lower the BPW to 126, still getting BLMs below 128 but I did bump the fuel pressure slightly. So you can see that pressure has a lot to do with TBI systems. If you think about it, 1 psi difference in a TBI system is like giving a TPI system what? 6-8psi, maybe more. All I know is it seems to be very sensitive. My problem right now is fuel pump, poor thing hates me.

V8Astro Captain

iTrader: (1)

I bought stock GM TBI injectors just recently. I was reading one of the posts here and I saw that someone said they were 65# injectors by th PN they listed.

I dunno, the only thing left to do is check the FP. After I posted the first message here, I went and made a couple chips and tested them. With the BPW at 145 it was still around 120 BLM. So I stuck the stock ASDU back in and guess what?? 117-120 BLM.

When I did the engine swap I used the FPR spring from a '94 fullsize van w/TBI. Maybe my FPR isn't exactly the same as that one. I know the cup thing that holds the spring in were slightly different. I'll try the V6 spring, tomorrow...er..later today

Brent

iTrader: (1)

Raising the BPW makes things richer.

Why are you changing the VE #2 table? Leave the values under 3200rpms stock.

I don't understand what you are doing. Post your VE#1 and #2 for us.

V8Astro Captain

iTrader: (1)

I thought that raising the BPW would lean it out.

My BLM's are so rich at 2000 and 2400 RPM I was trying to adjust the entire range by using the VE#2.

VE#1
0.0 11.3 12.1 29.3 32.4 38.3 41.4 44.1 47.3
3.9 23.8 21.9 29.7 34.4 39.5 42.6 45.7 47.7
3.9 23.8 33.6 36.7 41.0 42.2 44.1 47.7 48.4
9.8 36.3 38.3 41.4 42.6 46.9 48.0 48.8 49.6
14.1 41.8 39.1 44.5 45.7 48.4 51.2 52.0 50.0
18.0 42.6 43.0 47.7 49.6 53.1 52.7 55.9 56.3
19.5 41.4 44.5 48.8 53.9 56.6 54.7 57.8 62.1
21.5 35.2 45.3 49.6 54.7 57.0 55.9 59.4 64.1


VE#2
25.0
39.1
39.1
39.1
39.1
37.5
35.9
39.1
39.1
41.0
39.1
37.1
37.1
37.1
37.1
37.1
37.1

[This message has been edited by V8Astro Captain (edited November 02, 2001).]

Brent

iTrader: (1)

Ok, just change the cells in VE#1. Take 2400 X 50KPA (or whatever KPA the engine is running at) and lower that cell.

I don't see any cells close to zero past 40KPA.

V8Astro Captain

iTrader: (1)

That's just it. I have been doing that, over and over and over and the BLM still hangs around 120.

Brent

iTrader: (1)

If you can lower all the cells around the area you driving in by 30% and see no change there is a problem somewhere else.

prscarf

brent's right, your going the wrong way with the bpw, lower it. you also have to remember to hold you foot at a constant tp to ensure a constant rpm and map to let the blm find where it wants to be. then try to hold this rpm and map to achieve good data. accelerating and deceling will cause things to be all over the place. take your time at different rpms and maps to get good constant data to ensure your showing consistant readings. then tune to this good data, it all takes alot of time. do for all revs and maps until you cover the entire ve table. for the upper ve, use hills and use the same tuning methods but ensure you don't go into pe mode. turning this off will help (tp threshold change table to 99). be carefull if you turn this table off and watch your blms to ensure you don't max out and lean things out. hope this helps.