Timing drop

[vr2turbo]

My plug replacement sees a big jump in performance is simply because my old plugs were worn out pretty badly.

If you use normal plugs and get it replaced every 10K, I am pretty sure the performance will be almost the same as Iridium's performance. But one important note, turbocharged cars are forced induction car. It means that our combustion chamber has a lot higher pressure (with fuel and air) compared to NA's. What does it mean? The higher the pressure + more heat, the more difficult for the plug to ignite. Thus having iridium plugs for high pressure turbo cars, will benefit.... that's just my personal opinion.

Yes, you are right. Read it somewhere that under high pressure the spark harder to jump. Was asked to set the ground electrode nearer so gap becomes smaller. Best was change to platinum rather then normal ones....

 

[4gbanger]

i do abit of research on NGK web. even the higher the temperature/performance, the plug gap is smaller. vr2 is right and also under high temparature is also hard to jump.. that's why plugs come in different number such as 5,6,7,8 or 9. the higher the number, the better perform in high temperature but downside is poorer during cold run. correct if im wrong.

 

[vr2turbo]

i do abit of research on NGK web. even the higher the temperature/performance, the plug gap is smaller. vr2 is right and also under high temparature is also hard to jump.. that's why plugs come in different number such as 5,6,7,8 or 9. the higher the number, the better perform in high temperature but downside is poorer during cold run. correct if im wrong.

Yup, the hotter the run then the colder the plug. Normally if mod extra hp to the engine then get colder by one number. Can't remember the actual figure but something like 50bhp, so if 200bhp using No:6, then mod to 250bhp use No:7.
The thing is Bosch numbering is the other way round. Bigger number hotter the plug....8, 7, 6, 5.....
Then Denso go by 18, 20, 22....

 

[4gbanger]

ok this is what i get for airtrek (4G63T) iridium plugs. just wanna share..

NGK iridium IX.
Airtrek oem = BPR6EIX, evo 6 above = BPR7EIX.

Denso IRI power.
Airtrek oem = IW20, evo 6 above = IW20 or IW22

 

[stutzedward]

I just spoke to Ah Wah today. Modded trek must use IW24 from Denso.

 

[4gbanger]

what plug are u using bro?

do u have any experience using NGK iridium? or maybe others comment?

 

[stutzedward]

I'm using Denso IW24.

No experience with NGK bro.

 

[4gbanger]

i think i want to go for NGK this next change...

 

[vr2turbo]

ok this is what i get for airtrek (4G63T) iridium plugs. just wanna share..

NGK iridium IX.
Airtrek oem = BPR6EIX, evo 6 above = BPR7EIX.

Denso IRI power.
Airtrek oem = IW20, evo 6 above = IW20 or IW22

When using Denso was on IW20...

---------- Post added at 09:31 PM ---------- 6 hour anti-bump limit - Previous post was at 09:30 PM ----------

I just spoke to Ah Wah today. Modded trek must use IW24 from Denso.

Must be quite highly mod, so need colder plugs....

---------- Post added at 09:32 PM ---------- 6 hour anti-bump limit - Previous post was at 09:31 PM ----------

i think i want to go for NGK this next change...

The difference I know is Denso have 0.4mm tip whereas NGK ones are 0.6mm

 

[4gbanger]

hmm.. wonder whats the different in term of performance.. have any idea bro vr2?

 

[vr2turbo]

hmm.. wonder whats the different in term of performance.. have any idea bro vr2?

I did not try the NGK Iridium but change to NGK Platinum instead. To me, butt feel no difference as my engine is all standard turbo, no mod.

Reading their write up, 0.4mm more concentrated spark, but will 0.2mm makes a difference?
Maybe normal and 0.4mm will be different but 0.4 and 0.6?? Bro., you got to test it yourself....

 

[4gbanger]

i think changing to other brand may not be alot of different but what i concern is their life endurance. iridium tip is tends to kaput earlier. and the tip size might somehow affect the tip strength am i rite? and also choosing the right colder number might affect the performance on high end revving. mine is just use for like couple of month, now boosting only 0.9 will suffer jerking at rpm above 4000. but im not 100% sure that its the plug problem but i do think bcos im on IW20. i heard IW20 is only for bone stock..

 

[vr2turbo]

i think changing to other brand may not be alot of different but what i concern is their life endurance. iridium tip is tends to kaput earlier. and the tip size might somehow affect the tip strength am i rite? and also choosing the right colder number might affect the performance on high end revving. mine is just use for like couple of month, now boosting only 0.9 will suffer jerking at rpm above 4000. but im not 100% sure that its the plug problem but i do think bcos im on IW20. i heard IW20 is only for bone stock..

You using Ron 97 or 95? If 95, I had that problem after 4k rpm too, so now adding additives to continue using 95.
As for the tip, I have not had any breaking off after 2 sets. Anyway, is laser welding and supposed to be very strong. The iridium itself will not melt or break, scare only the welding....

 

[4gbanger]

yup. im on ron95 fuel. really felt the jerking especially on shell and bhp fuel. but so far petronas is slightly better..

 

[vr2turbo]

yup. im on ron95 fuel. really felt the jerking especially on shell and bhp fuel. but so far petronas is slightly better..

Brother, you are on 0.9 boost, I think maybe need Ron 97. Do you use any additives like octane booster?
I did try Shell Ron 97 Fuel Save formula back then, and my car could not run on it. Right after that they switch to the now V power 97. Probably that fuel had problems....

 

[stutzedward]

Bro banger and VR2, I suggest you have all the hardware mods you plan for your car done quickly, then send for tuning. I am running 1.5 bar now with Petronas Ron95 without octane booster. No jerking, no knocking. Pulling very strong. Tuning makes a lot of difference in terms of performance. Maybe I am still very heavy footed, I don't see improvement in FC yet.

Even in stock condition where you don't plan to modify (hardware)your car, you can still send for tunning to get better FC and slightly better power. I've been told bone stock 160-170whp can be improved to 180-190whp by just tuning alone and yet, gettting better FC.

AC Motorsports Lau has done a great job in tuning my car. Give it a try, I guarantee that you will not regret.

 

[resh9999]

How much does the tuning cost and where is the shop located. Thanks

 

[4gbanger]

Brother, you are on 0.9 boost, I think maybe need Ron 97. Do you use any additives like octane booster?
I did try Shell Ron 97 Fuel Save formula back then, and my car could not run on it. Right after that they switch to the now V power 97. Probably that fuel had problems....

bro vr, u better switch to other fuel. shell fuel all problem. u can search on one of our MAC thread where shell fuel gone wrong during dyno. now im using petronas, can feel slight different. but like bro stutz said, tuning does make it all better. even FC and power.

 

[stutzedward]

How much does the tuning cost and where is the shop located. Thanks

Tuning cost for Airtrek members is rm800. It's dyno tuning. U can call Ah Wah at 012-296-3909 and tell u get info from me in ZTH.

 

[vr2turbo]

bro vr, u better switch to other fuel. shell fuel all problem. u can search on one of our MAC thread where shell fuel gone wrong during dyno. now im using petronas, can feel slight different. but like bro stutz said, tuning does make it all better. even FC and power.

I have been on Esso and Mobil all along now of course is Petron. Have no problem with this fuel. Just that my friend ask me to try Shell. Not even one tank, next day I siphon out and poured into my NA Hyundai.....ha! ha!