2 Questions - Exhaust System and Spark plugs

[Grandavi]

Well.. lets see if I got this all right now...

Catback Exhaust System - Tanabe (T4041Z INTEGRA) Super Medallion Hyper Spec Exhaust Systems - GSR (60mm Pipe Dia. 100mm Tip Dia.) (580.00)

In front of that...

7MGTE SPLIT 3" Elbow/Downpipe Combo
[7MSPLITDP] - (254.00 not bad...)

Testpipe.. still gotta source... (dont need the electronic opener.. although that sounds very cool!)

I think that covers all with the exhaust. Should be about 1k total.. I think... roughly

 

[starscream5000]

Gapping Iridiums aren't that hard, just take your time and be careful, you use the same principles gapping all other types.

BTW to the OP, the Recirculated Divorced Down Pipe I mentioned already has an integrated turbo elbow built in, it's a one piece replacement for your two piece DP .

 

[jdub]

From what I understand, going to a colder heat range (just as you would with a copper plug) at high boost fixes this problem.

It helps, but does not eliminate the problem It's physics...the electrode on the iridiums is very small and iridium does not conduct heat as well as platinum or copper.

 

[starscream5000]

becauseican makes a integrated Turbo elbow and downpipe? Will search that in the forums for what it is and how much it costs...
roughly

935 Motorsports is a vendor on here as well, his DDP will net you the same result with less of a hit to your wallet.

 

[Grandavi]

Yeah, just saw it on 935 Motorsports. Looked at that before... that seems very good.. the 7MGTE SPLIT 3" Elbow/Downpipe Combo

Is it better to use the one the vents to atmosphere? (thinking it would be a bit louder when you let off the turbo) or is there any real difference. Quieter is better providing there is no performance cost.

 

[starscream5000]

There's not going to be much a difference to fuss over. I'll take the loss of ~5HP over the noise the open DDP makes. BTW, if you're in boost, and not just full boost, it will still be noisy

 

[Grandavi]

There's not going to be much a difference to fuss over. I'll take the loss of ~5HP over the noise the open DDP makes. BTW, if you're in boost, and not just full boost, it will still be noisy

I rarely run in full boost.. except maybe when I took it up to 185 kph... but the damn car vibrated so bad.. I dropped off. Front ball joints are shot.. so thats what needs to be fixed.

 

[starscream5000]

Since you've already decided on a quiet cat back, I'd keep with the theme and have the recirculated DDP, but it's your money, your car, your choice.

 

[supradjza80]

It helps, but does not eliminate the problem It's physics...the electrode on the iridiums is very small and iridium does not conduct heat as well as platinum or copper.

I understand what you are saying but I am thinking that a 20 heat range iridium compared to a 20 Range copper takes into account the size of the electrode.

But I realize we are sort of jacking the OP's thread, so we should probably find another thread to talk about this on. Do you have specific examples of this glow plug happening to somebody? According to both NGK and Denso it appears the iridiums are fine in boosted performance applications. I may just call them to see if I can talk to one of their engineers to find out for sure. Maybe we can talk about this through PM.

/end Thread jack

Good luck to the OP

 

[jdub]

Not really a thread jack...the OP asked about what plugs to use

I know IJ experienced the glow plug with iridiums and I suspect a guy in a recent thread torched a piston due to them, compounded by a couple other factors.

I'm not saying don't use iridiums...on a light to moderate mod'ed motor they will not cause a problem. On a performance motor, I wouldn't use them.

 

[Grandavi]

Yeah, spark plugs are an interest to me. This will be what I think would be termed a lightly mod'd Supra.. so they would probably be okay. Its a question of, is the cost worth it for Iridiums. Plats are ok and about $4-8 per.. depending on which you get.. Iridiums are about $13 per... so... does the Iridium give me more HP and fuel economy as compared to the plats or copper?

Also, with the divorced dp... If i understand correctly, it would be only louder at boost, so that isnt a bad thing if Im gonna squeeze a HP or two out of it. However.. if its loud idling and normal driving... then unless its like a 10 HP+ hit.. I would go with the quiet version.

 

[jdub]

You might get a tiny bit better gas mileage with iridiums, but the biggest benefit is length of service. You don't have to change them every 5-7000 miles like you do with coppers

 

[grimreaper]

jdub is there a way to tell if they are glow plugging before a piston gets trashed?



ngk, one step colder at .028, $2 a piece and work great

 

[supradjza80]

Yeah, spark plugs are an interest to me. This will be what I think would be termed a lightly mod'd Supra.. so they would probably be okay. Its a question of, is the cost worth it for Iridiums. Plats are ok and about $4-8 per.. depending on which you get.. Iridiums are about $13 per... so... does the Iridium give me more HP and fuel economy as compared to the plats or copper?

Also, with the divorced dp... If i understand correctly, it would be only louder at boost, so that isnt a bad thing if Im gonna squeeze a HP or two out of it. However.. if its loud idling and normal driving... then unless its like a 10 HP+ hit.. I would go with the quiet version.

The place I work for, www.rockauto.com has the iridiums (denos IQ-20)for 8.20 each.

I just thought we were going on a spark plug tangent compared to the rest of the conversation.

I'd be interested to hear about the glow plug storys, what the plug heat range was/boost/ modifications etc. I just find it hard to believe denso and NGK would say its ok to use these plugs in a High boost application when it is easier to melt a piston or detonate the engine.

I was just reading a story about a race engine builder using them in a big block ford that is boosted to 40 psi without issue. I think if done properly you could use iridium to help with high boost break up that some people have (maybe not on the 7m but for sure on the 2j).

 

[Grandavi]

Well actually.. I think I solved my "what the hell am I buying for my Supra" portion dealing with exhaust except I haven't sourced the cat replacement (testpipe). I have seen a 3" magnacat.. which looked great except for the pricetag (which wasn't so bad at 125'ish). Seeing as the oxygen sensor is up the pipe i dont think removing it would cause any problem at all and searching on Environment Canada's web.. they have zilch on Catalytic converters so i am assuming its a provincial reg .. and I doubt its an issue. I dont have to pass any smog board and I dont have to get it checked for insurance.. so I think the testpipe will be the direction for me to go.

As for the Sparkplugs.. I think it should be decided.. although wouldnt it be nice to sticky a "what sparkplugs should I use in a 7MGTE" for the thread? As for me.. I think its the tiny details that should be attacked. Popping 8 bucks for a spark plug is easy.. and if it helps the car.. then thats all i need to know really. Its not a 1200.00 turbo

 

[jdub]

Grim - High RPM misfire...even with gaps at say .025 or so.

djza80 - Most of the info Denso/NGK is for stock boost applications. Like I said, it's something I've seen...it's going to depend on the specific motor as to whether it will occur. As usual, the real answer is "it depends"

 

[grimreaper]

As for the Sparkplugs.. I think it should be decided.. although wouldnt it be nice to sticky a "what sparkplugs should I use in a 7MGTE" for the thread

there are quite a few threads on this.

 

[supradjza80]

there are quite a few threads on this.

Yes but it seems like there is little info on people actually using the iridium performance plugs, at least from what i have read...

 

[Grandavi]

http://www.supramania.com/forums/showthread.php?t=79192&highlight=Sparkplugs

This thread discusses it... good read but not much info other than.. I think most Supra owners are sold on NGK's.

 

[grimreaper]

^ there is a reason, some of the crowd like to do their own thing, (not particualry bad or good) some like to follow and let others make mistakes. Some help set those limits most of us follow and some ignore them completly. It comes down to the owner, do you have $$$ to spare to play with different settings and tunes and plugs at higher then stock boost? Do you mind rebuilding everytime you make a mistake and a ring breaks or piston explodes? Lessons have been learned on the 7m, and Listening is cheaper

Supradj not aiming this at you.