M20 Turbo Spark Plugs

[arashjahn]

BP8ES Gap 18 for 1 Bar with Methanol

I have the same injector volume, a GT2871R, MSD6AL Digital, MSD Blaster High Vibration Coil, and Cooling Mist M1 Methanol to cool the charge since I have no intercooler. Recently, I crammed in the Mishimoto MMRAD-E36-92X Silver Aluminum X-Line Performance Radiator to add an updated cooling solution for this aging e30. In the process of doing this upgrade, the temperature overall dropped (I suspect significantly) despite having the better thermostat value for the previous OEM radiator. When cruising on the freeway at night the gauge does not clear the blue marker.



So how does this relate to spark plugs?


I developed some reduced smoothness in driveability recently after the radiator upgrade, had BP8ES NGK plugs installed, and investigated them to discover they became fuel fouled. They were gapped 22. So I got another set, gapped them 22, and under full boost (15psi), they were getting blown out. These are brand new plugs! I Re-gapped them to 18 and the car pulls hard....pulls way harder than before! Trade-off is below...read on.



So, for my two cents, I contribute that these plugs can work, but if you are in colder temperatures (or run drastic cooling solutions as a cheat for lack of an intercooler with methanol instead) your car will run extra rich. So, car might idle ok, pull really hard on WOT, but partial throttle it will gargle with fuel; your OBC will think you have a range of 600+ miles (LOL) and you'll at best get 16 MPG if you behave on your tank.

Hi guys :)

I'm about to take my car to the dyno, I'm wondering which spark plugs are suitable for 15-17 psi and around 330-350hp?

I'm running 42lb injectors

Ngk bpr7es

Ngk BKR7E

Ngk BPR7EIX, iridium

Others?

THanks,

[BMWManiac]

I know we talked about BR7ES and BPR7ES......what about BKR7E? I found a brand new set in my garage so i just want to make sure I can run those

[FLG]

What gap are you guys running on the 7's

I gap em to 23ish

[aarontl]

What gap are you guys running on the 7's

[sayed ali]

I'll stick with the 7s but I'couldn't find irridium ones as of I'm using the stock plugs wires, the only one I can find over here are BR7ES

[blueapplesoda]

Ive run the bpr7eix iridium plugs for almost 20,000 miles before I changed them to a fresh set. They seem to be more resistant to blowout than the coppers. At 15-18psi, you could run the 8's if its a weekend car, cause the 7s are right at the heat limit around 320-330. The 7s will make the car idle better though, so its a sort of a compromise. I wouldnt race on the 7s, but for daily driving and boosting around town they are fine. Any more than that, like a track day or some heavy heavy canyon running I would run 8s.

[Cronopoulos]

The only ones I could find are BR7ES

Anyone have tried them?

Run those and see how you like them, very popular (inexpensive) plug among boosted setups outside of the BMW realm as well ;)

In the mitsubishi evo world, the BR7ES are preferred over the B(p)r7es which are a slightly "warmer" plug. p= protruding electrode... I think i worded that right.

[sayed ali]

The only ones I could find are BR7ES

Anyone have tried them?

[sayed ali]

8's foul out way to easy while your tuning, i run 7's on 15 lbs with stock coil and no issues yet. You have to get your feul dialed in pretty well before you run 8's

Thats a good one, thank you :)

[TS87325IS]

8's foul out way to easy while your tuning, i run 7's on 15 lbs with stock coil and no issues yet. You have to get your feul dialed in pretty well before you run 8's

[sayed ali]

Oh, seems that the 7es are not good for more than 1 bar, except if using wasted spark setup

maybe the 8es will be fine using the single coil setup

*Really confused* :(

[FrozenSolid]

Sorry should have mentioned i have wasted spark and gm coilpack

[sayed ali]

^ :(

So should I go with 8es from the beginning? Since I don't use a wasted spark setup and want to go over 15psi

[FLG]

7s here

Had spark blowout at over 15psi

Solved that with a wasted spark setup using an Accel magnavox coil pack from a turbo buick

Sent from my Galaxy Nexus using Tapatalk 2

[sayed ali]

Ok :) Seems the bpr7es are the way to go

Thanks guys