Hey guys! Ok so i have a 383 with a set of aluminum heads, mild cam, lifters high flow runners, 300# injectors blah blah blah... Just had a local tuner swap out the Gen 6 accel dfi system for the new Holley HP system. Got it back from him and the damn thing was running like SH**. I mean it was dying at every stop light studdering and jerking off the line, no matter what my throttle input was, and it feels like it has about half the power it did before he swapped everything and put this new tune on.

Before the new heads were installed it was dyno tuned and the results were 285 HP and around 300 TQ. After the new heads and taking it to this guy he showed me a dyno paper stating it had 230 hp and 240 TQ. But like i said it was running like sh**. Honestly with the new heads i was expecting around 400 HP at the wheels. Maybe im hoping for too much but i have seen similar setups pulling 450 - 500.

Now i have done some research on the dying at the stop lights and studdering problem and was able to fix it tuning the idle settings and modifying the injector output. He had it set to 22#, but like i said from what i can tell the car has 30# injectors (i have had the car a few years, prev owner put the injectors in)

But i really think some more tuning needs to be done. timing advance etc...

I have nearly all the receipts for all the parts that are on the car. So if someone can help me out i can provide details on the setup. I would just take it back to the tuner and have him fix it but honestly after the way he gave it back and said "Its running great, strong off the line and smooth down the rev range..." I really dont think he knows what the hell he is doing.

Please help LOL!

 

Where you located

 

Nashville TN area

 

No one here is a tuner?

 

If you cant do it yourself you need to find another shop local to you. You are too far from me

 

There are only two near me that i know of. Both of them have screwed me so far. Im loosing faith in local shops.

Was hoping i could get some tuning advice and maybe i could help myself. Even a decent bit of literature i could read to figure out what i need to know.

 

Uhh but wait, I thought it was self tuning! Just drive it around and it'll heal itself right?
Wrong, but some people believe that hype and bs advertising.
I'm now a Holley dealer, been an Accel dealer since '02 and an AEM and FAST dealer for the last two years. The Holley has it's place but it ain't what people claim it to be. It's not a true VE in it's basic state. That's one reason why the injector info is so important.

Send me your cal and I'll try to take a look at it.
fastone01@hotmail.com

 

Well i knew what i was getting into when i bought it. It is a self learning system but that(as far as i can tell) only applies to the fuel table and i think my issue is in the timing advance. I am brand new to tuning so while i can tell that the learning seems to be working i dont know if its learning correctly.

Im assuming by cal you mean global file for the tune. I just sent my tune to you. Thanks!

 

Post your combo and timing table

 

I dont know what the combo table is, but here is the spark table.

 

Combo i mean motor details. Cam specs compression heads intake stuff

Timing looks ok. Some of the mid lower map cruise areas under 2000 rpm could take abit more timing but its not a deal breaker

 

Ahh ok, well here is what i have.

Engine - 383 Chevy
Cam - Compucam 2050
Intake - Stock air intake, edelbrock base plate, high flow runners.
Lifters - Crane Hi Intensity Hydraulic Lifters 99377-16
Compression ratio im not sure of, its a 383 crate motor from BRE Performance.
Fuel injectors from what i can tell are 30# injectors. They were bought from summit with the part number ADS-5015I.

 

Seems like you have a more or less similar setup.

https://onedrive.live.com/redir?resi...int=file%2czip

This is my HP EFI Global File/Folder.
Maybe you can do some comparison or try that file (on your own risk , this works for me and my engine, but it's far from being perfect , i still have plenty of work to get it right, but maybe you have a better starting point ).


Some infos about my Setup:
383, Scat Crank, Probe Pistons
Stealth Ram Intake, Stock 2x48mm Throttle Body
30# Injectors (SVO Redtops) @#32 (43psi)
AFR 195 Heads
Jones Cam , HR70335-72330-110 ; 280/288 @.006" ; 224/224 @.050" ; .335"/.330" Lobe Lift ; .502" / .495" Valve Lift (with 1.5 rockers, i have 1.6) ; 110 LSA ; 107 Intake Centerline

Compression Ratio is 10.4 as far as I remember

With this file, my engine starts up the second I turn the key, idles good, no misfiring etc. but it consumes a lot of gas unfortunately (around 12mpg mixed driving, steady driving at 70 mph around 24 mpg) Think all the AE variables have to be tweaked , but sadly I don't know where to start, when to stop, I would need some help here as well. No chance for a local shop to do this here in Germany, most of them would take the money and screw things up... so it's up to me and maybe some helping hands from you guys.

 

I'll say it again, I though it was self learning? Just drive it and it will tune itself right? Yyyyyyeah.
Zero all of your transient tables and make sure your commanded air/fuels are reasonable at all loads and rpms. Then once it learns the base map you can take it from there,
Self learning my.............

 

PeterFeix and Fanatic1074 while there is some great help here, you should also visit the Holley EFI forum. You'll get great support there as well.

 

So you mean blank out AE vs MAP/TPS Tables with 0's ; Fill the Air/Fuel Table with reasonable data, let the system do the learning stuff and after that has finished edit the AE tables to smooth out the actual AFR readings to be as close as possible to the commanded AFR at load changes?

 

Yes.

 

What happened to accel and their dfi? Guess you can only sell yellow coil packs for so long. So I see you joined the dark side. Did this guy contact you?

 

Yes he did.
Didn't join the dark side, doing mostly AEM Infinity stuff, love it.
Accel was bought by MSD this time last year. Then Holley bought MSD, bye bye Accel, platform is done.

 

Has been some time but today I finally did it.

Zeroed out the AE vs MAP&TPS Tables completely , did a 50km test drive with learning at 100%. It subtracted up to 18% of fuel in the learn table within crusing range ( 1000-2500rpm map 60-85 ) . Fuel consumption was around 6.2L for those 50km. That equals 19mpg for mixed driving (30% city ~30mph ; 30% roads ~50mph ; 40% autobahn ~80-110mph )

Seems like zeroing out those tables have been a sucess , at least for economy reasons.
But I dont feel that the engine is less responsive or has any trouble.

 

Glad you made some headway.