Thanks man!

 

pffffff coward

Add 6 degrees at least.

And what about the trailing ... you running negative split?

15 degrees split is for tossers and puffs

 

Working on 15-16 PSI....
Feels strong.

11 split across the board.

 

11? I thought that was blasphemy?

Noticeable difference from 15?

 

Never tried 15, I thought the stock split was 11....
Should I try a 15 degree split?


I am currently getting some spark blow out past 180-190% load, maybe opening up the timing split would help?
(I blamed plug gap)
I should try it with more split.

 

what ignition system are you using--dwells?
gaps? plugs?
what are your a/f's at the time?
I am no where near 15 psi but my lead timing only goes to 14.5 with stock split. i do touch the 185 load.

 

My spark plug gap is currently .035, but I am thinking of dropping it to .028 -.030.
I am using the MSD 8247 coils with the BHR published dwell specs.

What rpm do you hit 185% load at?

Update: front rotor's spark plug was gapped at 040, rear at 035; both are now at .030.

Off to go logging, wish me luck.

 

The more I learn about these things the less timing I'm inclined to run . Blowing an engine or two does that to a fella . LOL

 

roger that! watch the timing closely.

BHR dwell specs for the truck coil( i am assuming around 5 ms of dwell?) is too much for the msd 8247's. The recommended dwell for 8247's coils is 3.3 ms.
You may have burnt them?
My 185 load is high in the rpm band
With my ignition set up I am running 36 of gap--i do run the denso plugs. i have no problems.
It may run better with the ssv tied open..... mine does.
What octane are you running?
AT 16 psi your static compression is still up there.
maybe i will start a discussion by saying that there is value in indexing our sparkplugs--expecially the leadings.

 

Ballsy, if you have good gas and can handle it by all means.

But that is about 4-5 degrees more than I'd run.

 

remember detonation is more likely to occur in the lower rpms--at least in theory.....

 

Ummm yeah ... sooo ... just got home from being away camping up north.
Sorry for the late response.

I'm trying to remember where I saw the 15 degrees of separation ... I know Jeff talked about it and I think I have a book that discusses it ... and a thread over at RX7club.com
I'll try and find the source material for you.

In the meantime ... here's a table of the Stock Style Separation vs. WCS Boosted Style Separation (which isn't really mine but MM's)

STOCK STYLE Ignition Separation:



WCS TC Ignition Separation


Notice how much 15 degree's of separation are used on both tables.

--

Could you describe to me what you are experiencing and associating it to spark blow out, please?
How can one tell this is occurring, I maybe have experienced the same thing and not known it.

edit ---
Oh and yes I'm using some negative split separation ... again Jeff's mapping

 

Whew, I made it, even with all the damn crap in here. I need to look at my timing maps when I get home.

 

holy crap photofucket sucks .... arrrrg OMG the new UI is *****!

@9k FWIW my timing maps

LEADING




TRAILING

 

MMMMmmmmm

I'm interested in trying this

 

How much boost are you running and are you on stock injectors? Greddy kit right?

 

11psi

Mawnee's old kit.
Top mount T04e-60

Yellows across the board, P2's are uncapped and flow tested at 800ish cc

 

Ah, gotcha. yellows in the p1 as well?

 

Hell yeah

Wouldn't want it to be easy eh?

 

Nothing comes easy boosting a Renny. I just spent the day pulling Hoss-05's engine and turbo and it only ran for less than two minutes,

 

^^^ WHAT?!?!?!?
He didn't pop the engine did he?

 

Zero compression on front rotor, it only idled for a minute or so. There was some metal shavings in the pan, and a sand like substance (hopefully not from NRS seals) in the oil in the exhaust manifold. We have it broken down to a keg and will pull it apart in front of the builder next weekend. We shall see...........

 

So I have been playing with powerFC its a tuning gizmo for FD's fortunitly I was able to find varies maps, however there not situated correctly, so I did just that, I converted the files to match our x-axis and our y-axis. additionaly the FD uses a MAP based system, that can be converted to boost, then I took into account the effective compression ratio's of both the rx8 and rx7 engine and came up with a chart, green shows roughly our 100% load, and yellow is our roughly 200% load. its interesting to see how close the two match except for split, much different.... discuss and enjoy!

 

Ok ... huh
Cool

Back to the books before I make any assumptions.

 

I've been working on timing quite a bit since I'm getting into boost. So I've referenced all of the maps I can find on 8 club. Now I'm pulling in data from 7's also. To start I collected all that I could find and have made a corss reference chart. That calculates absolute cylinder pressure per compression ratio. Then converts it back to the equivalent boost pressure for an rx8. finally converted the equivalent pressure to load.

This should make referencing rx7 maps to compare timing pretty easy.

Hopefully in a few days to a week. I'll have a compilation of the maps. With one showing the lowest timing I've found and one running the highest. My target is to use the lowest as a base timing then work timing up.