Not getting a "linear" pull

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Not getting a "linear" pull

Unread postby vortechblown306 » Sun Sep 06, 2015 1:38 pm

I'm not sure why I keep getting a clipping like pull. Its usually from 3000k and above. I have datalogged a few of them with different maf transfers and different spark settings but they all seem to have this common flag4 when it seems like it starts pulling power away from the car. I'm not sure if there is something wrong with an hego or my pulse width is off or what. My wideband looks ok around 12afr but this has been kicking my butt and for the 50 times I have hauled the mail down the road and back I'm sure my neighbors are getting pissed!!! And I am pissed because I missed the races in columbus this weekend because I couldnt line this thing out. Any input would help thanks
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Vehicle Information: 88 GT A9L2, quarterhorse, BE2012, 306, 9:1 comp, Edlebrock Performer heads, B303 Cam, FMS 30lb injecters red top, Pro-M 75mm, GT40 upper and lower intake, 340lph hp pump, MSD distributor, 6al and msd wires, BBK 70mm throttle body, bbk cold air, T-5
Vehicle 2 Information: 91 LX 393 stroker DEMON tuned w/175 shot.
Vehicle 3 Information: 64.5 Coupe 289 holley 750 double pumper tuned.

Re: Not getting a "linear" pull

Unread postby vortechblown306 » Sun Sep 06, 2015 1:53 pm

here is the tune and 2 datalogs
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Posts: 22
Joined: Mon May 19, 2014 7:52 pm
Name: Shawn Barnhart
Vehicle Information: 88 GT A9L2, quarterhorse, BE2012, 306, 9:1 comp, Edlebrock Performer heads, B303 Cam, FMS 30lb injecters red top, Pro-M 75mm, GT40 upper and lower intake, 340lph hp pump, MSD distributor, 6al and msd wires, BBK 70mm throttle body, bbk cold air, T-5
Vehicle 2 Information: 91 LX 393 stroker DEMON tuned w/175 shot.
Vehicle 3 Information: 64.5 Coupe 289 holley 750 double pumper tuned.

Re: Not getting a "linear" pull

Unread postby quartermaster » Sun Sep 06, 2015 2:29 pm

Hi Shawn I am no expert so take my advice with a grain of salt but your FN035 sea level load scaling does not look right. It looks like the load values are a little low. The other thing is your Fn904A spark table does not look like you added any timing per your heads. His timing table is just a starting point and you have to add timing everywhere in the table for what ever heads you are using. This info should be in the A9L2 write up and there is a cylinder head timing chart somewhere. It might be in the timing write up. I don't know if either of there things are related to your particular problem or not but they are not helping. If I am wrong then Decipha will straighten things out. One question though. Why do you have you high and low slopes in the 50s when your sig. says you have 30s? Andrew
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A9L Tweecer Rt, Cal Edit 11.3 @127 last year before tuning. new times 10.93 @ 131.5

Re: Not getting a "linear" pull

Unread postby decipha » Sun Sep 06, 2015 2:33 pm

is the engine boosted? how much boost?

you can see in the log at 3.15 et where hego1 (passenger bank) went dead lean, which indicates you had a hard misfire

you can see the engine was struggling, from 2.05 to 3.05 you went from 2800 rpm to 4000 rpm and from 3.05 to 4.05 you went from 4k to 4600, she definitely wasn't happy

i would suspect your either blowing out spark or your distributor is screwy, you should replace the distributor regardless
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Re: Not getting a "linear" pull

Unread postby vortechblown306 » Sun Sep 06, 2015 2:53 pm

Sorry I switched to 42's...sorry.... also running a measly 6psig boost.

I already ordered some autolite 23's, I was going to try that and I replaced one oxygen sensor on the drivers side maybe I need to just change out the passenger side too and see if that helps. I do have a brand new one. As far as a distributor holy """" I do have my stock one I could throw in there but it never did this before I was boosted.

I think my wideband is on the drivers side which makes sense why I wouldnt see it. But I do see the Hego1 cutting out. How would I blow out spark
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Posts: 22
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Name: Shawn Barnhart
Vehicle Information: 88 GT A9L2, quarterhorse, BE2012, 306, 9:1 comp, Edlebrock Performer heads, B303 Cam, FMS 30lb injecters red top, Pro-M 75mm, GT40 upper and lower intake, 340lph hp pump, MSD distributor, 6al and msd wires, BBK 70mm throttle body, bbk cold air, T-5
Vehicle 2 Information: 91 LX 393 stroker DEMON tuned w/175 shot.
Vehicle 3 Information: 64.5 Coupe 289 holley 750 double pumper tuned.

Re: Not getting a "linear" pull

Unread postby decipha » Sun Sep 06, 2015 3:01 pm

the spark not being able to jump the gap, msd distributors suck, the stockers are much better last longer and usually are good for a few rwhp as well since they control spark more accurately

what plugs do you have in it now and what are they gapped at ? toss some autolites in there and you'll probably be legit

the hego seems to be functioning fine its the actual engine misfiring you need to worry about
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91 4r70w - Skarlett
92 (2x) 5spd & auto - Bianqa, Andrea
93 auto - Danika
94 5spd Rionda
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Vehicle 2 Information: Others:
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98 Camaro SS - Bounquisha
02 Harley F-150 - Sasasha
03 Marauder - DyShyKy
00 Explorer 5L - Bernyce
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Re: Not getting a "linear" pull

Unread postby vortechblown306 » Sun Sep 06, 2015 3:08 pm

decipha wrote:the hego seems to be functioning fine its the actual engine misfiring you need to worry about


I thought about that right after I posted it.


I'm about to go back out and pull the distributor and see what the plugs are. I think they are 3923's but I'm not positive, prob gaped at 28 or 32. it was along time ago.
vortechblown306
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Posts: 22
Joined: Mon May 19, 2014 7:52 pm
Name: Shawn Barnhart
Vehicle Information: 88 GT A9L2, quarterhorse, BE2012, 306, 9:1 comp, Edlebrock Performer heads, B303 Cam, FMS 30lb injecters red top, Pro-M 75mm, GT40 upper and lower intake, 340lph hp pump, MSD distributor, 6al and msd wires, BBK 70mm throttle body, bbk cold air, T-5
Vehicle 2 Information: 91 LX 393 stroker DEMON tuned w/175 shot.
Vehicle 3 Information: 64.5 Coupe 289 holley 750 double pumper tuned.

Re: Not getting a "linear" pull

Unread postby vortechblown306 » Sun Sep 06, 2015 5:45 pm

It still fell off Ill wait for the plugs and see what's up then.
vortechblown306
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Posts: 22
Joined: Mon May 19, 2014 7:52 pm
Name: Shawn Barnhart
Vehicle Information: 88 GT A9L2, quarterhorse, BE2012, 306, 9:1 comp, Edlebrock Performer heads, B303 Cam, FMS 30lb injecters red top, Pro-M 75mm, GT40 upper and lower intake, 340lph hp pump, MSD distributor, 6al and msd wires, BBK 70mm throttle body, bbk cold air, T-5
Vehicle 2 Information: 91 LX 393 stroker DEMON tuned w/175 shot.
Vehicle 3 Information: 64.5 Coupe 289 holley 750 double pumper tuned.

Re: Not getting a "linear" pull

Unread postby vortechblown306 » Sun Sep 06, 2015 9:23 pm

I was wondering if I had a breather filter in on the passenger side do you think this would cause it to drop off like that? I'm wondering if I'm not being an idiot not thinking that through. But I do have datalogs that don't have the drop off of Hego1
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Posts: 22
Joined: Mon May 19, 2014 7:52 pm
Name: Shawn Barnhart
Vehicle Information: 88 GT A9L2, quarterhorse, BE2012, 306, 9:1 comp, Edlebrock Performer heads, B303 Cam, FMS 30lb injecters red top, Pro-M 75mm, GT40 upper and lower intake, 340lph hp pump, MSD distributor, 6al and msd wires, BBK 70mm throttle body, bbk cold air, T-5
Vehicle 2 Information: 91 LX 393 stroker DEMON tuned w/175 shot.
Vehicle 3 Information: 64.5 Coupe 289 holley 750 double pumper tuned.

Re: Not getting a "linear" pull

Unread postby decipha » Mon Sep 07, 2015 5:48 am

no the engine is misfiring severly, its most likely ignition related or possibly a clogged injector (doubtful)
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91 4r70w - Skarlett
92 (2x) 5spd & auto - Bianqa, Andrea
93 auto - Danika
94 5spd Rionda
95 auto Aisha
Vehicle 2 Information: Others:
00 Lincoln LS - Luanda
98 Camaro SS - Bounquisha
02 Harley F-150 - Sasasha
03 Marauder - DyShyKy
00 Explorer 5L - Bernyce
07 GMC 2500HD 6L - Veranafer

Re: Not getting a "linear" pull

Unread postby red5.0fogger » Mon Sep 07, 2015 6:28 am

Maybe the blower belt is slipping? If anything got on the belt you could have a slippery spot on it and slip each time it crosses? Just a wild ass guess.
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Re: Not getting a "linear" pull

Unread postby decipha » Mon Sep 07, 2015 6:35 am

that wouldn't cause a misfire
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Vehicle Information: Supercoupin' x10
90 (4x 5spds) - Dante, Ruby, Daja, Ava
91 4r70w - Skarlett
92 (2x) 5spd & auto - Bianqa, Andrea
93 auto - Danika
94 5spd Rionda
95 auto Aisha
Vehicle 2 Information: Others:
00 Lincoln LS - Luanda
98 Camaro SS - Bounquisha
02 Harley F-150 - Sasasha
03 Marauder - DyShyKy
00 Explorer 5L - Bernyce
07 GMC 2500HD 6L - Veranafer

Re: Not getting a "linear" pull

Unread postby red5.0fogger » Mon Sep 07, 2015 6:42 am

Yes true, I didn't view the logs.
I also forgot he didn't change the plugs yet.
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Re: Not getting a "linear" pull

Unread postby quartermaster » Mon Sep 07, 2015 8:13 am

Hi All Wouldn't a better more powerful coil help? I am boosted and have my plug gap set to .050 with no misfire problems. I had an MSD distributor, hvc coil and 6al box. The distributor started to eat itself so I ditched that for the stocker but kept the rest. Just my thoughts and as always correct me if I'm wrong. Andrew
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Vehicle Information: 89 LX 331 9:1 T5 trans until it grenades Afr 185 heads, Performer Rpm, Comp Cams xe274hr, Deka 60s,Sct Ba 2800 long tubes, X pipe, Vortech si, 11Lbs so far, 19Lbhr meth injection
A9L Tweecer Rt, Cal Edit 11.3 @127 last year before tuning. new times 10.93 @ 131.5

Re: Not getting a "linear" pull

Unread postby decipha » Mon Sep 07, 2015 8:30 am

yea a weak coil will cause a misfire, fouled plugs, weak wires, even a crossfire, etc... any number of things can cause a misfire

if the plugs don't do it I would suspect the coil next
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Location: New Orleans, LA
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Vehicle Information: Supercoupin' x10
90 (4x 5spds) - Dante, Ruby, Daja, Ava
91 4r70w - Skarlett
92 (2x) 5spd & auto - Bianqa, Andrea
93 auto - Danika
94 5spd Rionda
95 auto Aisha
Vehicle 2 Information: Others:
00 Lincoln LS - Luanda
98 Camaro SS - Bounquisha
02 Harley F-150 - Sasasha
03 Marauder - DyShyKy
00 Explorer 5L - Bernyce
07 GMC 2500HD 6L - Veranafer


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