Currently jdm motor (sr20de) is going into my classic, but I've read others who noticed that the jdm didn't pull as strong.

Suggestions included increasing the timing, but how many degrees...without having to worry about hurting the engine.

Please help (and yest Jason Garrett Young and Andreas Miko...your guys' suggestions are always welcome :D )

Thanks!
GameDay

well, some sources say 17* BTDC max on stock ecu, and 19* w/ JWT ecu. i went up to 17 at first, and then went up to 19* and premium 93 octane gas. my motor is completely stock. i have had no problems/detonation w/ 19*, but im sure the condition and mileage of engine play a part. im going back down to 17* soon though, premium is expensive!!!! i's not worth it for like 2 hp 19* has over 17*. just my $.02.

Originally posted by JDM_2ner
well, some sources say 17* BTDC max on stock ecu, and 19* w/ JWT ecu. i went up to 17 at first, and then went up to 19* and premium 93 octane gas. my motor is completely stock. i have had no problems/detonation w/ 19*, but im sure the condition and mileage of engine play a part. im going back down to 17* soon though, premium is expensive!!!! i's not worth it for like 2 hp 19* has over 17*. just my $.02.
that's not what i read
what i read is there's no power advantages in going past 19 degrees and 15 degrees is a MUST on the JWT ECU

So 17 degrees is the max? Is that the consensus?

What is BTDC?

Thanks!
GameDay

I read this , I read that....................blah blah blah..........

Sorry. :D ;)

I have a JDM and I dont know where in the world you heard that it doesnt pull as strong. Plenty of JDM peeps on here pull well over 145hp on the dyno with i/h/e. If you still sport 15 degrees, you might as well stop modding.

I have my timing at 19 degrees and I made the most HP with that. Of course I always run 93 octane. Bust out the wallet and strap your baby to a dyno to find out what it likes best.
Dont be afraid to go to 19. I don't understand why people get so damn scared. If it pings after you set it to 19, get out the car and put it back to 17. Its that simple. Oh , yeah. Get a marker and mark the original position of the distributor before you do anything. That way you have a guiding "point" on how far you have turned the distributor. Good luck!!! Dont be skeered!!!!!

17 degrees is the maximum level allowable on the spec using 87 octane gas. 19 has been found to give a few more ponies and throttle response but then you need the good stuff:)

I have a JWT ECU.

I had it set at 15deg., then dyno'd it. Eric Waterman advanced it to ~19deg.

I gained a few ponies.

I, too, had heard about 15deg. recommended for JWT ECU. I guess not so.

I had it at 17, now I got it at about 19 and it feels more responsive... stock engine no mods as of yet... S4 cams soon

I had to back my timing to like 13 degrees with my JWT ECU and the 10:1. On the dyno my car was pinging with advanced timing. (Ray Kawaski and others noticed it) The HP was a little higher but the spitting was awful. Now it pulls even better and feels smoother. I am eventually sending the ECU in to get a 10:1 program.

Originally posted by JDM_2ner:
"...well, some sources say 17* BTDC max on stock ecu, and 19* w/ JWT ecu..."

That's backward from what I've always heard. JWT ECU's advance the timing, so you're supposed to run less than if you have a stock ECU.

Mike,
BTDC is Before Top Dead Center, consequently, ATDC is After Top Dead Center. When I got my SE-R earlier this month, I checked the timing and it appears to be at 19* so I left it alone, as it's not pinging as far as I can tell. I'd go 17*-19*, but as you may have noticed, 93 octane is rare around Omaha, so maybe go with 17*. Like Smooth Daddy said, if it's pinging at 19*, drop it down, no big deal. It's up to you. Your JDM should pull as strong or stronger, depends on what compression your engine is I suppose.

I thought 15 was only for turbo JWT Ecu's

Chris
Throwing more ingredients in the mix

Originally posted by JDM_2ner
premium is expensive!!!! i's not worth it for like 2 hp 19* has over 17*. just my $.02.

hmmm.. I'm not sure how much premium is where you are at but if you do the math (atleast for me) it only cost me about $2 extra to fill the tank from completly empty to full with premium as opposed to regular.. I think it's well worth it

Posters, toolapcfan, everyone!

Thanks for the responses. I'll try 17, then 19, if it starts to pings, I'll back her down! I appreciate it!

Mike/GameDay

I don't know what JDM motor doesn't pull as strong as the USDM. An sr18de, maybe. JWT does their tuning for CA 91 octane piss water. Sunoco has 94 here in MD. I think 19 degrees is not a problem for the states with 93+.

About the highest I ever see around here is 91, if you know of any place that typically has 93 Mike, let me know. I think I've seen it once. Then again, I always get the highest grade, never payed attention to the octane rating until lately.

15 degrees for JWT ECU and/or S series cams.
21 degrees for Tomei street cams (yes, it's dyno proven).
17 degress to have fun with premium gas. There are usually a few more Hp's to gain if you go to 19 degrees. But watch out for detonation when it's hot outside, and/or when you are climbing up the hill.

Advanced timing will not only increase power but also better your gas mileage. So, eventually you will be paying approximately the same dollars-per-mile rate anyhoo.

Boonie

I don't know if this makes a difference to anyone, but on 3 different SR20's, I've actually had proven to myself that putting in premium 93 octane actually *increased* gas mileage to the point that it was actually $0.25 cheaper per tank to use premium.

So, not advancing the timing because of more expensive gas wasn't an issue for me, my brother, or my best friend.

ive also noticed increased milage, if i go down below 93 my car eats the gas up a lot faster, dunno if its because of the increased timing, which i have set quite high ill have to check the numbe rone of these days but i noticed it before i advanced it as well.

I'm running 19 deg on 87 octane. As long as it's not hot, I guess it's ok. My car doesn't ping. I Gteched my 0-60 to be the same with both 87 gas and 91 gas.

I set my timing at 18.175* ;) and found that to give me the most hp w/no pinging when i dynoed it.

Seriously. Just take it to a dyno and get an hour of time, start with it at 15, then turn it ever so slightly after each run till you get up to the point where it starts to ping. Then back it down to the setting that gave you the most hp before it pinged. That would be ideal.