dean85gt

iTrader: (7)

I just spent two weekends at the dyno trying to resolve this issue without much luck.

The car basically falls on its face after about 5800rpm. AFR is good, timing is good it just feels like it hits a limited.

Combo Details:
58x 5.3
243 heads
LJMS stage 2 cam, BTR .660 springs
VS racing s480 clone
Th400 with PTC 9.5" converter
E85
BR7EF plug started at 0.024 then down to 0.022

So I've been running the 58x preset on the holley efi with the older style heat sink coils. I logged the dwell and it was 3.5ms. After the first dyno day I realized that the dwell on those coils could be increased to 4.5ms. So I was hoping that increasing the dwell time would solve the issue.....

I set the ignition to "custom" 58x and 4x cam sensor. I then adjusted the dwell table to 4.5ms. Long story short the car wouldnt start and I couldnt figure out why.

So closed the plug gap to 0.022 and tried again without methanol. Long story short same BS.

I have now swapped on a set of newer style coils (D510C) which holley recommends to have a max dwell of 3.5ms (which is the what the LSX 58x holley ignition preset commands. These coils would have been off this motor (2007) so I am hoping they will not blow out.

Has anyone every experienced this? I'm pulling my hair out over it. It should pull cleanly to 7k.

rotary1307cc

iTrader: (5)

If it's blowing it out keep closing it up. I run .015 on the regular to keep it lit on water

rotary1307cc

iTrader: (5)

I'm guessing you have a holley. They are very sensitive to this even though there should be no reason for it. It is a very simple operation to charge and fire the coil

dean85gt

iTrader: (7)

Yes its the holley. I didnt think I had to close the gap that much??? Are a lot of you guys running 0.015 gaps?

I run 20psi on the norm.

rotary1307cc

iTrader: (5)

How old is the box, as in what soft are was original for the box?

What is it running currently

dean85gt

iTrader: (7)

Pretty sure I got it in 2013. I know about the issues with the pre 2012 units.

Ive got the V4 on it right now

rotary1307cc

iTrader: (5)

Ok so it's a v2 box

I bet dollar to donuts if you flash to v2 firmware and run v2 it will completely go away


I also have a v2 box. .... Always been sensitive to blowout compared to a stock computer but fine if keep the gap tight

I loaded v4 on it last summer (I wanted the new tables) and pushed my tune on...

Runs and drives just like before but I mean it literally will not run in boost it broke up so bad. Fueling and everything correct

Flash back on v2 and just fine again


I know others have had similar issues, and more usual than not with the 585s

rotary1307cc

iTrader: (5)

If u try v2 please report back what you see

dean85gt

iTrader: (7)

It blows my mind why the car wont even start on a "Custom" ignition using LSX 58 tooth crank sensor and 4x cam wheel. Makes NO sense to me

dean85gt

iTrader: (7)

It will still get into boost. I can make >650rwhp but as soon as it hits anywhere near 6k its done

rotary1307cc

iTrader: (5)

Do you have it as digital falling?

dean85gt

iTrader: (7)

I think I had the wrong output setup....Must have hit it by accident.

If I can up the dwell to 4.5ms should I put the heat sink coils back on....or should I just try the newer style coils at 3.5ms??

Nathaninwa

The truck coils tend to self ignite at anything over 4.5ms while running. Cranking is fine to have more since the dc is low. I've never had a problem making power at 3.5 to 3.7ms with a .026 gap on my LS and a .031 gap on my 2jz with the same coils. Watch voltage correction too, there are images on the net showing the stock correction curve

I had a problem with the alternator not charging when it got hot, and found out the correction curve was off a little, and it would start to stutter on the big end of the track, showed up as a cooling cylinder on the egt data

stevieturbo

One thing you can be sure of though....the actual fault is not with the coils. They have more than enough power for your setup, even at 20-25thou gaps.

Holley does seem to have problems in this area though, which does seem bizarre.

Has anyone ever actually scoped and logged what it is doing when it is supposed to be charging/firing the coils ?

stevieturbo

Also...does this Holley problem also occur with other coils, or is it just the LS coils ?

Has anyone swapped to the IGN's for example and these cope better with whatever Holley is doing to trigger them ?

69-chvl

iTrader: (11)

I had bad luck with the Br7EF...they would run good new at .022 but after a couple of miles it would break-up getting into boost. Switched to Br7ES (non-V grooved) and they have been in there for almost a year now.

badass68

iTrader: (7)

I've been using d585 coils set at 4.5ms with Holley v2 box updated to v4 for couple years on two different motors. A 13:1 sbc 409 on a 200 shot turning it to 7500rpm with ngk v-power plugs (.032 gap). And now a twin turbo 6.0l with some denso platinum plugs I had laying around the shop (.028 gap). Still tuning but no problems at 16psi so far. Both combos are with E85.

LLLosingit

iTrader: (4)

This is from another post but they were running Holley coils and E85 The spark would blow out in the upper rpms, He had been gapped at .022 and Holley recommended a .030 gap and it solved the issue.

Crf450r420

iTrader: (1)

I've seen people have issue with those coils before not even running boost. We ran the D510C with V1 on 18lbs of boost without issue using NGK 4554 plugs gap .040". I'd say switch coils as the D585 seem to have the most issues of all the LS coils. The D510C and run 4.5 and even 5.0 dwell.

Forcefed86

iTrader: (4)

More dwell isn't necessary or better in this case. Most don't need dwell over 4.0 with the 585 coils. At 4.0 dwell the D585 puts out 2-3 times the milliamps as the others coils do at 5.0 dwell. It's a better coil. Holley just doesn't have their $hit together. My MS3 fires great at 4ms and .024 gaps with heavy water injection at 26lbs. I think alot of the problems are the autoparts stores D-585 replacement coils. Which are garbage.