Topic: high top end break up? (Read 22708 times)

danz · « **on:** May 29, 2009, 11:36:26 AM »

got my D16a6 together, pulls like a FUCKING champion till about 7200-7500 rpm.

but i want more...

i thought for a while ectune was fucking with me and setting a low rev limit, but i just stayed on it and lone behold it got up to 8000, but it had to struggle.

running about 16psi on a holset he351cw w/ r5671a-8's

the plan is to try to regap the plugs (they are box gap right now) and if that doesnt help to swap in a different dizzy.

any other thoughts/suggestions

DmC · « **Reply #1 on:** May 29, 2009, 12:03:29 PM »

My first thought is what a tool but other then that Yeah gap the plugs down to about .025

danz · « **Reply #2 on:** May 29, 2009, 12:40:37 PM »

Quote from: DmC on May 29, 2009, 12:03:29 PM

My first thought is what a tool but other then that Yeah gap the plugs down to about .025

i got plenty of tools... including a spark plug gapper. ill make sure to put it to good use.

marcj · « **Reply #3 on:** May 29, 2009, 01:52:08 PM »

sounds like it's choking on back pressure or crank case pressure.

chris · « **Reply #4 on:** May 29, 2009, 02:05:36 PM »

Or running out of fuel

danz · « **Reply #5 on:** May 29, 2009, 02:51:54 PM »

bosch fuel pump 788 precision injectors

back pressure? maybe, with the 2.5inch reducer

ryan89crx · « **Reply #6 on:** May 29, 2009, 03:50:31 PM »

re-gap the plugs

marcj · « **Reply #7 on:** May 29, 2009, 04:13:40 PM »

2.5" pipes should flow enough for your D.. they start choking top end power around 400whp, which I doubt you're at.

You didn't gap the plugs? are you serious?
I'm surprised the spark doesn't go out sooner than 7500. out of the box gap is fucking huge. reduce the gap to .030 or less and go from there.

btw, how does that 9cm^2 housing spool on the HE351? I'm probably going to throw a quick spool valve prototype on my HX35 for testing purpose. Hoping to pick up some mid-range torque and spool time without banging anti-lag.

MantisX · « **Reply #8 on:** May 29, 2009, 04:22:32 PM »

I think stock gap on NGK BKR7Es are around .030/.032. They were good for me up to around 8psi. After that I had to gap, so yeah, gap plugs nig nog.

danz · « **Reply #9 on:** May 29, 2009, 04:37:52 PM »

Quote from: marcj on May 29, 2009, 04:13:40 PM

2.5" pipes should flow enough for your D.. they start choking top end power around 400whp, which I doubt you're at.

You didn't gap the plugs? are you serious?
I'm surprised the spark doesn't go out sooner than 7500. out of the box gap is fucking huge. reduce the gap to .030 or less and go from there.

btw, how does that 9cm^2 housing spool on the HE351? I'm probably going to throw a quick spool valve prototype on my HX35 for testing purpose. Hoping to pick up some mid-range torque and spool time without banging anti-lag.

with the 2.5inch it spools up to full boost at about 5100 rpm in 3rd. (right now about 16psi)

the R5671A's have a tighter gap out of the box.. not like a .044 bkr7e-11.

thanks for the replys, just didnt want to overlook anything.

marcj · « **Reply #10 on:** May 30, 2009, 03:54:46 PM »

let us know how this turns out.. we need more ripper vids on this site!

danz · « **Reply #11 on:** May 31, 2009, 12:04:05 AM »

well the box gap on the r5671a-8's was .025... so i gapped em down to .020 and it didnt make a diff

put a new dizzy on, didnt make a diff...

fucking car is pissing me off.

caged · « **Reply #12 on:** May 31, 2009, 04:21:33 AM »

How old are the leads? How rich are you running just before it missfires, it could be a rich miss?

danz · « **Reply #13 on:** May 31, 2009, 01:56:14 PM »

brand new NGK blue's, its 11.5ish AFR... which shouldnt be too rich

rudebwoy · « **Reply #14 on:** May 31, 2009, 04:20:19 PM »

ignition upgrade, many will say no , but give it a try, go digital

BoostForLife · « **Reply #15 on:** May 31, 2009, 04:52:39 PM »

You tried resistor plugs?

Joseph Davis · « **Reply #16 on:** June 01, 2009, 01:36:40 AM »

Post datalogs.

Where is your wideband grounded?

danz · « **Reply #17 on:** June 01, 2009, 02:13:59 AM »

Quote from: Joseph Davis on June 01, 2009, 01:36:40 AM

Post datalogs.

Where is your wideband grounded?

tried BKR7E's gapped to .025 today, didnt make a difference. knocked the timing down to 16deg, didnt make a diff... lowered the boost to wastegate setting (12psi) didnt make a diff...

wideband grounded to the ECU.

datalogs here. you can see the boost seems to drop off as well when the rpm and speed stops climbing...

so fucking pissed off.

BoostForLife · « **Reply #18 on:** June 01, 2009, 02:27:32 AM »

why is the bin/tune named LS test?

danz · « **Reply #19 on:** June 01, 2009, 02:34:25 AM »

Quote from: BoostForLife on June 01, 2009, 02:27:32 AM

why is the bin/tune named LS test?

because i used the ls high cam map that has rows to 11050 rpm.

Joseph Davis · « **Reply #20 on:** June 01, 2009, 09:12:50 AM »

How about you post the datalog like I asked and not some faggot screenshots of shit I could care less about?

Hint: "ADDITION OPTIONS..."

danz · « **Reply #21 on:** June 01, 2009, 12:25:14 PM »

Quote from: Joseph Davis on June 01, 2009, 09:12:50 AM

How about you post the datalog like I asked and not some faggot screenshots of shit I could care less about?

Hint: "ADDITION OPTIONS..."

lol. gotcha. work ends in 6.5 hours

Joseph Davis · « **Reply #22 on:** June 01, 2009, 01:24:04 PM »

I'll be here. So will others.

danz · « **Reply #23 on:** June 01, 2009, 08:16:10 PM »

danz · « **Reply #24 on:** June 01, 2009, 08:16:44 PM »

danz · « **Reply #25 on:** June 01, 2009, 08:21:23 PM »

holy shit, i just added a battery voltage graph along side RPM and it takes a HUGE SHIT when it breaks up!!!

COULD THIS BE IT?!?! id jerk a nut off if so.

danz · « **Reply #26 on:** June 02, 2009, 02:38:17 AM »

replacing the alt didnt help... it holds 13.5v now at "red line" but still doesnt do it!! wtf.

what would jd do?

Kain · « **Reply #27 on:** June 02, 2009, 10:17:07 AM »

Quote from: danz on June 02, 2009, 02:38:17 AM

replacing the alt didnt help... it holds 13.5v now at "red line" but still doesnt do it!! wtf.

what would jd do?

emf shieding and good grounds?

danz · « **Reply #28 on:** June 02, 2009, 02:31:02 PM »

i guess you might need the map as well.

danz · « **Reply #29 on:** June 02, 2009, 02:33:43 PM »

here are some more datalogs from last night....

after the new alt was installed.

News:

Author Topic: high top end break up? (Read 22708 times)

chris

rudebwoy

BoostForLife

BoostForLife