Brettus

iTrader: (2)

Something seems odd allright - especially if the car is running ok . With vac down 3" you would expect it to stall out at idle all the time and I'm sure JCab would have noticed something was amiss before the dyno .
Fault with the dyno

05rex8

iTrader: (7)

what was the vac readings before the seafoam?
I want to know how low it was....

shaunv74

Wow. That is odd. Especially since it was so strong at the dyno day we did in January with Jeff. Even with a clogged cat. it pulled really hard and strong.

Sorry to hear that. :/

Anijo

It was stalling all the time at idle... We took a 10min spin during the tuning processes and it stalled 6 or 7 times, sometimes just while coasting out of gear.

Brettus

iTrader: (2)

/\ bugger . Did it idle ok after the seafoam ?

J.Cab

iTrader: (1)

At idle my vac was 13" and after the seafoam it went up to about 16-17". So I am not to sure what is going on. I will have to do a compression test I suppose. It drives fine now, it doesnt stall or nothing. Its pulls hard as hell to about 5-5.5k then the power drops. So I am going to get some new plugs and seafoam again. On the dyno day I only let the seafoam sit for about 30 mins. So I will let it sit overnight when I do it the next time. There was possibly to much carbon build up from the AFR's being in the 8-9's im assuming. Kane can probably tell more about how rich it was, but it was pretty bad.

05rex8

iTrader: (7)

dang that is low

the vac seems good now--do you notice any power difference?
any stalling?

edit: damn...you did a ninja edit...lol
you have answered all my questions.

Brettus

iTrader: (2)

Sound like your engine is OK and there is another "issue" going on .
You saw what 05rex8 had to do to get power past 5500 didn't you ?
Could be the same thing . The clipped turbine just does not work with the stock actuator .

05rex8

iTrader: (7)

yeah exactly..I was thinking the same thing
he should definitely mod the actuator arm

J.Cab

iTrader: (1)

Yeah I saw that, but in July I was able to pull 290whp at 7k with it running really rich as hell. So I would assume that the tune has definitely gotten better since then obviously. So I dont know how it made no power this time.

05rex8

iTrader: (7)

^I'd like to see the dyno chart on that

my boost spike was my peak HP and that was at a higher rpm. boost would drop down to like 5-6psi before that. I'd like to see your power curve leading up to your peak HP...if it was anything like mine, you would need to modify the actuator arm

Brettus

iTrader: (2)

yeah - I'd wager that 290whp you made was on a spike just like 05rex8's

Kane

iTrader: (1)

No - the 290 WHP graph looks pretty good; minus the stupid rich AFR's.

Mad props to Ray - with the right dwell those damn coils can light a spark at 8 AFR and 9 PSI!!!!

I had to pull 25% out at the top end just to un-peg the wideband.... so it was a tad bit rich.... LOL

Now he is seeing clean 11.5 AFR's to redline, good timing and no knock sensor drama @ 9PSI..... so actuator arm or not - 9 PSI is 9 PSI... there is no reason he should not be seeing better than 290 other than loss of compression (either from OMP underoiling or carbon buildup) or something else I haven't though of....

J.Cab

iTrader: (1)

Thanks for the clarifying Kane. My car did run super rich for a couple of months, so I am hoping that its just carbon build up.

I will be doing Seafoam again tonight, letting it sit over night and see what it does.

Also, I should be get some new plugs. Do you think that willl help it out a bit?

Another question, is 15-16" okay on a engine at idle?

Kane

iTrader: (1)

Your plugs looked fine - you can clean 'em if you want to just be safe.

15-16 at idle is the low side of OK; but that reading doesn't tell all; you need a compression test.

MazdaManiac

iTrader: (3)

Almost all of the turbo motors I've seen only make 7.5 - 8.0 PSI (15" - 16") of vacuum, even with a new install on a totally fresh, high-compression motor.
Probably something to do with the long intake path.
Giver or take for altitude.

Kane

iTrader: (1)

I've seen both; but combined with hot start and the power loss past 5K - do you think it might be something else Jeff?

MazdaManiac

iTrader: (3)

Hot-start problems are usually fueling.
Low compression is power loss at low RPMs.
Low compression motors usually make GREAT power as the RPMs climb.

Kane

iTrader: (1)

I think that is where Dan got the carbon issue maybe; as we lost power up top (maybe due to blow by from stuck seals)... I tell ya; that was a first for me; other than tuning issues like timing, but we fixed that.

J.Cab

iTrader: (1)

So I guess premixing NOW would just be a waste..I will do a compression test, but I am still open to other ideas as to what it could be.

Kane

iTrader: (1)

Well your OMP's are now a lot better; so you can prolly avoid premixing unless your oil levels are not dropping (mechanical issue).

I premix just to be safe... in the meantime get that darn compression test!!!!

Brettus

iTrader: (2)

So -you actually saw 9 psi at 7000+ rpm but made no power ?

That does not make sense

Kane

iTrader: (1)

I saw 9 PSI all the way to redline....

And made no power. Thus the blow by conclusion.

Brettus

iTrader: (2)

I can't get my head around that - the very fact that you saw 9psi would mean he was flowing lots of air ?

Kane

iTrader: (1)

That's what low compression motor do... move air but with limited power....

I bet I couldn't have gotten the turbo too much higher since the power was down, but the BNR turbo is just barely waking up at 9 PSI.