T3/T4 Setup Stuttering/Missing at High Boost!?

7811 Views 48 Replies 17 Participants Last post by SABBAi, Oct 8, 2008

mx6gtboi

Discussion Starter · Sep 15, 2008

Hey all, dont post much here but im having some annoying issues I thought some could help me with. I have a Precision Ball Bearing T3/T4 50trim turbo with full fuel system upgradess, full MSD Ignition System, methanol Injection, DMH Electronic Exhaust Cutout, running JB ECU, etc.

With the cutout closed im pushing about 14.5-15psi, car pulls very hard with 10.5afr around there. With cutout open, turbo pushes 18psi, 11.0 - 11.2 afr, except the car starts to studder/miss violently at high boost levels with the cutout open.

What could be doing this? The ignition system consists of NGK IX iridium ZFR6FIX-11 with stock gap(.044), Taylor wires, MSD Blaster 2 coil w/ MSD Streetfire Ignition box and MSD Tach Adaptor. What do you think could be causing this issue? Compression is perfect on the motor, all maintainence is very up to date, no vaccuum leaks, etc. Does anyone think im experiencing spark blow out at high boost levels? Im thinking switching to a copper plug + 1 heat range colder + smaller gap(.035?) will help me with this problem. The funny thing is this only occurs with the cutout open = more power and spark blow out? This car still has tonnes of room left, looking to push 22psi very soon but have to figure out whats going on. Any suggestions anyone?

P.S. The meth pump leaks when it comes on at 10psi, the the normal pressure it usually outputs has been cut in half until my new pump arrives, any contribution to the problem you think? Thanks all for the help!

Reactions: 1

1 - 20 of 49 Posts

Rizzo90

· #2 · Sep 15, 2008

Rid yourself of the iridiums, go w/ some v-powers or e3's, both are copper plugs & love boost...gap the v-powers down to about .035 & see what happens. The E3 won't allow you to gap it...but they fire so damn good you don't need to. I'll bet yer blowing out the spark. The iridiums might be good for economy, but did the same thing in my engine on a stocker turbo. There's my 2cents man:tup:

compnut21

· #3 · Sep 15, 2008

vpowers ftw. platinum is just overhyped crap anywho.

mx6gtboi

Discussion Starter · #4 · Sep 15, 2008

Thanks for the replies guys, I was thinking it must be the plugs because every aspect of the fuel and ignition system are bran new. Who makes the E3 plugs and where are they available? I was thinking with going to a NGK V-Power ZFR5A-11 and gap them down to .035 gap. What do you guys think? After im all done, gonna post some pics of my setup and a nice dyno vid of a 300+whp f2t! cant wait, only limiting factor will be the stupid VAF for now, hehehe...

Rizzo90

· #5 · Sep 15, 2008

you can get 'em @ advance or parts houses...part # for the f2t is E3.48

Reactions: 1

Mx-6Hybrid

· #6 · Sep 15, 2008

i got some ngk 9s, suppose to be colder plugs but my car stopped stutterin in boost
V-POWER FTW

Mazda Carnage

· #7 · Sep 15, 2008

mx6gtboi said:
I was thinking with going to a NGK V-Power ZFR5A-11 and gap them down to .035 gap. What do you guys think?

I think you will melt the plugs.
ZFR5A-11 are hotter plugs.
You want ZFR7A-11 they are the colder plugs.

And check those Taylor wires for arching, they work well but are cheap and come apart when you pull them.

defiler

· #8 · Sep 15, 2008

Thanks for the replies guys, I was thinking it must be the plugs because every aspect of the fuel and ignition system are bran new. Who makes the E3 plugs and where are they available?

Dont waste your money on that E3 crap. You've already seen what junk irridiums do on a boosted motor, you dont want that to happen again (And at $5+ a plug, you dont want to waste your money on junk)

Go get yourself some regular NGK's and gap them down a little. Ive hadmine all the way down to .032 (Trying to diagnose a same problem at 16PSI) and never had a problem after that.

Zach

· #9 · Sep 15, 2008

I've had stuttering issues...it's more than likely your plug wires. It improved some after getting new plugs, but went away totally after getting new wires. IF you pull yours, check around the boot for burn marks, I'm sure you'll see some. Go get some stock NGK's, almost guaranteed to stop your stuttering issue, on stock gap

zlyricist

· #10 · Sep 15, 2008

for what its worth, i ran 22psi on stock gap on v-powers with no problem, and that was on a stock coil/ign system. id swap the plugs before the wires, as plugs are quite a bit cheaper :shrug:

Zach

· #11 · Sep 15, 2008

zlyricist said:
for what its worth, i ran 22psi on stock gap on v-powers with no problem, and that was on a stock coil/ign system. id swap the plugs before the wires, as plugs are quite a bit cheaper :shrug:

not that much cheaper. A set of new NGK plugs are 15, and my new set of wires last winter cost me $25 :shrug:

91mxgt

· #12 · Sep 15, 2008

iridium plugs are not made for anything boosted whether it be a turbo or supercharged engine...

defiler

· #13 · Sep 15, 2008

Neither are platinum plugs:shrug:

not that much cheaper.

For a real set of plugs it is. NGK's at the stealership are still $55 (But of a higher quality than the JoeSchmo auto store cheapos)

Ive never had a problem with my plug wires going bad, other than a boot popping off.:shrug: But then again, I only use MSD or NGK wires...

Zach

· #14 · Sep 15, 2008

defiler said:
Neither are platinum plugs:shrug:

For a real set of plugs it is. NGK's at the stealership are still $55 (But of a higher quality than the JoeSchmo auto store cheapos)

Ive never had a problem with my plug wires going bad, other than a boot popping off.:shrug: But then again, I only use MSD or NGK wires...

What are the differences of the NGK's at the dealer than at Autozone or Schucks?

I only run NGK wires as well. My last set, the #4 wire developed a perforation or crack just above the boot and caused my misfire. When I pulled it, the wire/boot fell apart.

ademan

· #15 · Sep 15, 2008

mx6gtboi said:
Hey all, dont post much here but im having some annoying issues I thought some could help me with. I have a Precision Ball Bearing T3/T4 50trim turbo with full fuel system upgradess, full MSD Ignition System, methanol Injection, DMH Electronic Exhaust Cutout, running JB ECU, etc.

With the cutout closed im pushing about 14.5-15psi, car pulls very hard with 10.5afr around there. With cutout open, turbo pushes 18psi, 11.0 - 11.2 afr, except the car starts to studder/miss violently at high boost levels with the cutout open.

What could be doing this? The ignition system consists of NGK IX iridium ZFR6FIX-11 with stock gap(.044), Taylor wires, MSD Blaster 2 coil w/ MSD Streetfire Ignition box and MSD Tach Adaptor. What do you think could be causing this issue? Compression is perfect on the motor, all maintainence is very up to date, no vaccuum leaks, etc. Does anyone think im experiencing spark blow out at high boost levels? Im thinking switching to a copper plug + 1 heat range colder + smaller gap(.035?) will help me with this problem. The funny thing is this only occurs with the cutout open = more power and spark blow out? This car still has tonnes of room left, looking to push 22psi very soon but have to figure out whats going on. Any suggestions anyone?

P.S. The meth pump leaks when it comes on at 10psi, the the normal pressure it usually outputs has been cut in half until my new pump arrives, any contribution to the problem you think? Thanks all for the help!

im supprise nobody said this yet, your full fuel system upgrade consist of pump and jaybe chip. . and you running 18psi and trying to go more on stock injector?. okay. i you sure you are not running lean?

lundgren420

· #16 · Sep 16, 2008

PSI is realivent to lbs/hour aswell. The type of pressure put out from a T3/T4 is different then the IHI VJ11. The car is probably about to fry a piston. Adaman is on the ball on thiss one yet again.

Mazda Carnage

· #17 · Sep 16, 2008

Zach said:
What are the differences of the NGK's at the dealer than at Autozone or Schucks?

The quality, believe it or not, NGK's in the same box with the same part # can be of different quality depending on where you buy them. The dealership seem to be the best quality, one of our parts suppliers gets them and they are crap (they crack when torquing them in), places like wallmart, canadien tire ... don't ask for the same quality plugs from the manufacturer as say Napa or Autoparts Extra.
And I think our supplier gets them from the reject bin.

Mazda Carnage

· #18 · Sep 16, 2008

ademan said:
im supprise nobody said this yet, your full fuel system upgrade consist of pump and jaybe chip. . and you running 18psi and trying to go more on stock injector?. okay. i you sure you are not running lean?

mx6gtboi said:
With the cutout closed im pushing about 14.5-15psi, car pulls very hard with 10.5afr around there. With cutout open, turbo pushes 18psi, 11.0 - 11.2 afr, except the car starts to studder/miss violently at high boost levels with the cutout open.

Maybe, maybe not.

mx6gtboi

Discussion Starter · #19 · Sep 18, 2008

Sorry for the lack of an update. I am running Racetronix 39lbs high impedence injectors. So far I replaced the plugs with NGK Vpower 1 range colder plugs with .035 gap, but im still getting a bit of a misfire. A Message to everyone, NEVER buy Taylor wires! Been through like 2 sets now, very cheap quality they dont last at all! What do you guys think about NGK Wires Vs. MSD Wires? Will the NGK wires kill the benefits of the Blaster 2 coil and MSD Streetfire Ignition box?

Car is running great now, pig rich at idle with the bigger injectors, but hauls crazy ass now at 18-19 psi and 11.8 AFR on the wideband. Gonna crank her up too 20psi and go 75& meth hydrate/water for the injection, hoping for something close to 300whp for this puppy, then id say its time for standalone

Zach

· #20 · Sep 18, 2008

Get NGK's, hands down

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