i have an 88 rx7 t2 with a big single. haltech e6x.

had the car tuned a month 2 months ago on the dyno and made 414 hp.
car ran great no issues. until i blew my front cover o ring and lost oil pressure.

i pulled the oil pan off to diagnose the low oil pressure issue and found a piece of the front cover in the pan. looks like the front cover has to come off.

i had to park the car for 8 weeks due to an injury. after i recovered i changed the front cover oring and put a new clutch in.
now when try to get into boost i get some wicked miss fires and i have to shut it down.

things i have checked
zeroed the timing 3 times lol
checked for boost and vacuum leaks.
checked spark
checked map signal
checked turbo for boost with charge pipe off.

any other ideas?

 

a new set of plugs cured it.
odd because the old plugs had less then 100 miles on them.

 

Ive seen weirder things happen.
What setup are you running, I am interested

 

well the same thing happened again. this time i only got 20 miles and maybe 10 key cycles on this set of plugs before it started breaking up around atmospheric pressure. what could be killing a set of plugs so soon.

my set up is
haltech e6x
HBP
ballanced & doweled
switzer s300
750x1600
walbro 255
stock 9s all around
running 17 to 20 psi
110 leaded gas (2 months old)
dynoed 414 whp 340 ish wt

 

you have 1600cc secondary injectors..... it's your staging.

Your running pig rich (why new plugs bought you some time).

Give the ms before staging and the ms after stagging

I run 850cc and 1600cc so should be pretty close for a sanity check.

It takes a bit of skill and time to get a good transition with 1600cc but you can get it.

 

i dont know about that because my car was tuned by a reputable tuner. ill check the ms for you tomorrow tho

 

Unfortunately some reputable tuners don't take alot of time (if any) to tune cold starts, throttle pumps, idle, and transitions since they won't grenade your car.

 

My spark plugs don't appear to be wet. If anything, they seem dry.

 

Do you have a wide band?

 

yeah I guess I'll bring the lap and the wide band tomorrow and hook er up.

 

ms @ 1500 rpm 5.68 before staging and 2.97 after staging.

 

Seems like it's rich before staging (I assume your staging is at 0 psi).

I run 4.3 before and 2.5 after.

Given my 850cc are 12 percent larger 4.8ms would be what i would run before stagging on 750's and prolly about 2.7 ms after stagging.

It's quite possible your engine needs that fuel but I think you might have too much fuel.

Plugging your wideband in is the best way to tell.

It's been cold lately here so your intake temps might have been lower if you live in a cool climate and the Air-Fuel correction maps might make it richer than normal (same for coolant but after it warms up should be fine).

 

havnt had time to hook up the wide band up yet gonna put some miles on it this weekend and see how long the plugs last.

are you running HBP?

 

check your correction maps

 

what would i be looking for?

just burned thru another set of plugs. im hooking up the wideband now

 

so the A/F ratios range from 12 to 13. idling and cruise. most of the time closer to 12.5

the plugs i pulled out are bone dry.

 

log the wideband on your haltech and post logs of you going into boost

 

i dont have the ability to log air fuel but i do have a dyno chart from my last tune with no adjustment made to the map. the only thing that changed is the climate


keep in mind my plugs are bone dry. can a dry plug be fowelled ?

 

Plugs will never appear wet with fuel unless you flood the engine.

 

You're only concerned about the transistion.

Have a friend watch and you ease into it in 5th gear.....

It will go very lean or very rich if you are having transition issues.

This will happen slow enough you should be able to see it.

Logging is best but you can't.

 

I ran into the same problem on the dyno the other day. I changed the plugs to a set of non-resistors and it went away..