XSTransAm

A great quote my boss used to alwasy say "Just cause YOU can't do it dosent mean it can't be done!"

silver93

no worries, i didn't mean to come across like i was challenging you, either.

it really was meant to be an innocent/neutral post - with never an intent of telling you what can or cannot be done.

i know you've been around for a while, and are not an idiot, which is why i actually put up my initial post.

anyway, sounds like you've got it all set up and I hope it works out great! best of luck!

SleepR1

What's wrong with the HKS Twin Power ignition amp? Isn't that unit a twin channel CDI? That's the amp I went with--cured my high-rpm ignition break-up like a charm.

the_glass_man

iTrader: (2)

Nothing other then its like $800

fastcarfreak

Hks twin power is less then 500

93BlackFD

i noticed when wiring the AEM, it sends a dedicated power wire to each coil, unlike the twinpower which, since you retain the stock ignition coil harness, has to send the same power to all coils

thought that was neat

SleepR1

Ahh... I briefly considered the AEM, but the setup was not as straight-forward as with the HKS unit. I really liked the simplicity of the HKS setup if you get the HKS FD Rx7 wiring harness. My HKS Twin Power was <$500 with the FD harness from MVP Motorsports www.mvpmotorsports.com The Twin Powers are regularly stocked. Good luck with the setup, and I hope you make your goal!

SleepR1

What were your AFRs tuned to to make 384 rwhp @ 6500 rpm with stock motor and turbos? Just curious. I'd bet you were in the high 11s, low 12s, and your injector duties were in the low 90% range?

What boost pressure? What AIT?

My 370.9 rwhp @ 7000 came with 10.9-11.1 AFRs with injector duty @ 84.7%. Boost was 16 psi. AIT was 35 C (95F). Fuel was 93 octane unleaded pump gas.


Big rwhp ain't free. To get a 384 rwhp @ 6500 rpm from stock ports, stock twins, you must be running a leaner AFR, race fuel, and high injector duties?

93BlackFD

currently it's giving me some issues (backfiring, popping), but I have too many obligations this week to be messing with the car, maybe i'll check it out this weekend- i've got AEM and haltech both emailing me trying to get it all setup and figured out

SleepR1

Mine backfires and pops all the time. Apparently this is normal with open exhaust (DP/MP/CB)? Good luck!

fastcarfreak

Yeah i would say one out of every two startups gives a loud *** bang for my car. It scares people walking by sometimes. lol

93BlackFD

no, i mean it's hardly driveable....i know what you guys are referring to

93BlackFD

update, i put the ignitor back in, and i rewrapped the coil harness with heat shrink, replaced plugs

everything works, hard to say if it was wiring, ignitor, who knows, it works, so i am leaving it alone

i will say, do not use the tachometer output from the AEM, at about 4k rpms it goes straight to 9k rpms and beeps, so it is clearly not the right signal

car feels great though...throttle response is greatly improved, and it feels a lot torquier (word?) down low

as far as AEM vs HKS....

since the HKS is plug and play, i do not think it is as good as the AEM

the coils are all fed off a power wire, a common one, the HKS would amplify only this wire, and the signals to the coils....

the wire runs 12v stock (or whatever your alternator puts out) to the coils

the AEM, has a seperate power supply for the trailing/leading coils, and it sends 540v to the coils...since the coils go 100:1 ratio, if you supply 12v, you get 12,000volts, if you supply 540v, you get 54,000 volts

so, AEM = nicer than HKS in theory

SPOautos

yea, thats why I like the MSD6a.....45,000 volt all for my leading coil to eat haha

And only $100 for the box, what more could I ask for haha

STEPHEN

93BlackFD

that's true, i'm going to investigate how to run two seperate coils for my leadings...then relocate my coils somewhere else

clayne

Say what!? The coils are the transformers here.

SleepR1

I'm with clayne...

93BlackFD

your coils get an input voltage (stock is 12-14v, depending upon alternator output), they send the spark plugs voltage on a 100:1 ratio, so that would be 1,200 volts, the AEM outputs 540v to the coils, so the spark output is 54,000volts...

this is from the mouth of an AEM technician

pluto

Yes, coils are trasnformers. to be technical, they're step up transformer. I think what brian was refering to is that the coil winding is 100x more to step up 100 times the voltage it was inputting. current will be 100x less because P1 = ~P2 where ~ is the % loss of the coil itself

clayne

Okay, I agree with that, standard transformer logic.

However, 540V output from the AEM?

a. Is the AEM doing it's up step-up now as well?
b. What's the purpose?

Boostn7

>>I commend you for trying to break the 403 record. That is pretty damn cool if you do. But you may want to think about having 5 or 6 motors to go with them twins. Well im sure you can do it withing a motor or 2<<

The record is 402 rwh and 356rwt on stock non-seq twins and stock motor (~51k miles) on pump gas(93).

Let me see......over 40+ pulls on the same day and drove home with the same good motor.
Boost was hitting 18 psi on last few runs as it hit 390's and finally the 402 with A/Fs in th elow 11's.
Even hit 19psi where it hit 365 rwt but inj's(4x850cc) maxed out(95%+) and stayed locked open.

93BlackFD: The only issue you may have is maintaining boost at higher rpms.....a well ported engine will out-flow the twins output at the higher rpms(6.5rpm+)....This is my ongoing issue.......

GOOD LUCK !!!

dubulup

A. It's an A M P L I F I E R
B. "Why, what big spark you've got", "The better to eat you with"

SleepR1

The HKS Twin Power delivers enough spark to do away with high-rpm miss? Nicer installation was the part I appreciated with the HKS unit. Boostn7--those are pretty amazing numbers considering low 11s AFRs!

dubulup

The AEM looks pretty sweet mounted in the stock igniter location

SleepR1

That's the location I mounted my HKS Twin Power...right over top of the igniter