I need your old functioning stock coils

[TitaniumTT]

If anyone here has been following my dyno adventures, you'll probably recall me saying that Dave and I made huge gains in power with small changes to AF's in the 10-5-11.5 range as we crept up to .8L or 11.7-11.9. We believe this is due to the ignition system being sub-par in terms of spark current and energy. I'm running 4 LS1 coils (D580's) and for a long time they were considered an upgrade from stock and on par with the stock+CDI box setup. Unfortunately I have yet to find any back to back dyno graphs or true data concerning these or other coils. I'm frankly tired of internet legend and ass dyno's and want to put an end to this once and for all. Here's my plan

Over the winter I'm changing a few things on the setup including injectors and coils. Which ever coil I decide on will be the one that we tune with until the L's and turbo's are dialed in, most likely a new Bosch coil. Then the fun begins and the bullshit ends.

Over the winter I'll be modd'ing my harness to accept a DTM connector for the ignition setup so we can swap coils and plugs in a matter of minutes while on the dyno. I'll also be building my own spark plug wires and they will all be of the same wire so no one can butt in and say, dude, your wires sucked, that's why X coil didn't do as well, that's what I use and they're AWESOME! There will be none of that at the end of this test. I thought about contacting someone with an occiliscope, but I think real workd results will work better.

I plan on testing -
Stock 2nd gen coils
Stock 3rd gen coils
Stock RX8 Coils
D580 coils
D510 coils
and a set of top secret Bosch coils

My car will be the test mule and the testing will be done at my expense. I will NOT be giving any road/ass dyno feedback. The only things that I will be able to provide are back to back dyno sheets with in a few minutes of each other, comments on idle quality and starting ease. We'll probably do two runs on each coil just to make sure the results aren't some type of fluke. In other words, actual numbers to despense with internet lore.

So, here's what I have/what I need. I have a set of stock 2nd coils, the D580's, and I'll be fronting the coin for the Bosch coils. What I need from you guys are your old stock 3rd gen coils, old stock RX8 coils, and if anyone is feeling generous, OR if you're planning on upgrading to the D585 coils (LS2 Yukon Coils - I've been told by a few people that the D510C coils - latest gen LS7 engine - outperform the D585's) perhaps you can front for the D510C's and I can test those for us. Of course you'll get them back after the test and I can throw in the connector housings, pins and seals that you'll need to do the wiring for fronting the cash for these coils, probably ~$20 worth of electrical cripe. No chinese knockoffs though, Tyler They can be purchased from RockAuto (returnable withen 30 days) for ~$68 each or AC-Direct (don't know thier return policy) for $62 I think...

So, who's feeling generous for the greater good of the community?

[Mawnee]

Will you be setting up different tunes for the different coils? In a test with that many different coils there is alot of room for variance just on the dwell needs/characteristics for the different coils. The yukon coils for instance may not perform any better than stock(rx8) with a stock dwell map(other than reliability). Give them the extra 40-45% dwell that they like and there would be something to see.

[TitaniumTT]

I will have to in some instances becuase of wasted spark. I agree though, that it's not fair to test a coils without letting it see what it want's for dwell. That will be the ONLY change though. The timing, the boost map, the fuel map, will all be the same. The CLWB will be turned off as well.

We've actually got every coil with the excpetion of the D510C's.... so if there is anyone with an 8, local or not, that is thinking about doing the D585 route, if you want to know exactely what these coils gain, buy the D510C's and send them to me!!! You'll get em back, I promise.

[Mawnee]

Originally Posted by TitaniumTT

I will have to in some instances becuase of wasted spark. I agree though, that it's not fair to test a coils without letting it see what it want's for dwell. That will be the ONLY change though. The timing, the boost map, the fuel map, will all be the same. The CLWB will be turned off as well.

We've actually got every coil with the excpetion of the D510C's.... so if there is anyone with an 8, local or not, that is thinking about doing the D585 route, if you want to know exactely what these coils gain, buy the D510C's and send them to me!!! You'll get em back, I promise.

Sounds good. I look forward to seeing the results!

Sorry I cant help, all I have laying in the garage is set of bad stockers. Running the Yukons now

[05rex8]

^glad to see you made it over to this forum

[Mawnee]

Originally Posted by 05rex8

^glad to see you made it over to this forum

Thanks Only registered so I could see those rearmount pics.....but was poking around everywhere before I knew it

[Turbo II Rotor]

Brian, I happen to have a complete set of tested good RX8 coils. Pm me your address and they are yours.

[The Partsgroup]

Brian,
I would suggest starting w/ BRAND new OEM RX8 coils as a base line instead of used coils. I have an in house mustang Dyno and have done more pulls from our RX8 race cars than I care to admit. This is what I do before & after every race. I dyno the cars before we load them into the race trailer with NEW coils and when we get back from a race weekend the cars go straight back onto the dyno before any work is performed. What I have been seeing all last season is that even though the car still feel fast and pulls well the car is down on power after every race. I simply pull the coils and replace them w/ NEW OEM coils and guess what the power is back to where we started. I have a good friend that works with Speedsource and he has also has seen the same results. So back to where this started. I believe even though you may have decent used RX8 OEM coils I would suggest tested NEW OEM coils for your baseline. Hope this helps and I didn't mean take your post over..

[Herblenny]

Originally Posted by The Partsgroup

Brian,
I would suggest starting w/ BRAND new OEM RX8 coils as a base line instead of used coils. I have an in house mustang Dyno and have done more pulls from our RX8 race cars than I care to admit. This is what I do before & after every race. I dyno the cars before we load them into the race trailer with NEW coils and when we get back from a race weekend the cars go straight back onto the dyno before any work is performed. What I have been seeing all last season is that even though the car still feel fast and pulls well the car is down on power after every race. I simply pull the coils and replace them w/ NEW OEM coils and guess what the power is back to where we started. I have a good friend that works with Speedsource and he has also has seen the same results. So back to where this started. I believe even though you may have decent used RX8 OEM coils I would suggest tested NEW OEM coils for your baseline. Hope this helps and I didn't mean take your post over..

That is very interesting!

[05rex8]

yup it's pretty well know; stock rx8 coils do not last very long

hence the reason why I have BHR's ignition system--yukon coils and msd plug wires all in a nice plug and play package for the rx8
well plus I'm FI and I need a strong ignition

[TitaniumTT]

Originally Posted by Turbo II Rotor

Brian, I happen to have a complete set of tested good RX8 coils. Pm me your address and they are yours.

Scott, Thanks much for the offer. Bill was supposed to send me a set, lemme PM him and see where we're at. He was also supposed to look into some D510C coils which I REALLY wanna get my hands on but I'm a little hesitant to spend coin on more coils, although they may outperform the Bosch soooooooooooo.... I dunno

Originally Posted by The Partsgroup

Brian,
I would suggest starting w/ BRAND new OEM RX8 coils as a base line instead of used coils. I have an in house mustang Dyno and have done more pulls from our RX8 race cars than I care to admit. This is what I do before & after every race. I dyno the cars before we load them into the race trailer with NEW coils and when we get back from a race weekend the cars go straight back onto the dyno before any work is performed. What I have been seeing all last season is that even though the car still feel fast and pulls well the car is down on power after every race. I simply pull the coils and replace them w/ NEW OEM coils and guess what the power is back to where we started. I have a good friend that works with Speedsource and he has also has seen the same results. So back to where this started. I believe even though you may have decent used RX8 OEM coils I would suggest tested NEW OEM coils for your baseline. Hope this helps and I didn't mean take your post over..

Tom, don't worry about taking over the thread, that's good information right there. As far as I know the coils aren't cheap, and as interesting as it would be to dyno back to back with new coils, I'm not sure the cost justify the results ONLY because most people aren't running around on brand new coils.
Out of curiosity though, how much of a drop do you seen after the race? And does the power continue to fall off or does it fall off considerably after one race, and then not so much after the others.
I thought you were running the D585 coils on your race car? What ever happened with that little project?

[TitaniumTT]

Originally Posted by Herblenny

That is very interesting!

Yeah it is!

Originally Posted by 05rex8

yup it's pretty well know; stock rx8 coils do not last very long

hence the reason why I have BHR's ignition system--yukon coils and msd plug wires all in a nice plug and play package for the rx8
well plus I'm FI and I need a strong ignition

Can I uhh, borrow those for a day?

[Mawnee]

Originally Posted by TitaniumTT

....Can I uhh, borrow those for a day?

Where are you located? I'll loan ya mine if you are near.

[TitaniumTT]

Cool man, thanks. I'm in the SE corner of CT but if you're anywhere near me or on the way to New Tripoli I think it'll work out. Where are you located?

[Mawnee]

Originally Posted by TitaniumTT

Cool man, thanks. I'm in the SE corner of CT but if you're anywhere near me or on the way to New Tripoli I think it'll work out. Where are you located?

Doh Central Florida =/