Dyno Results! Dissapointing...or is it?

Here are my dyno results for the day. Todays best run in blue and last years in red. Added since last year...JWT cams and Hotshot header.

Notice the drop in low end torque! It pulls all the way to redline but that low end drop really gets me. The final result, 146hp is OK I guess, but as George would say, "that's just trivia." I really need a solution for my torque drop.

Here's the chart comparing one of the first runs of the day (RED) with my best run (BLUE). I got the final result by playing with the timing. I don't know what the actual setting is but it's less than 19 and greater than 15. I was just using trial and error. At less than 15 I lost power along the whole band and after 19 the power line started to get really jagged (onset of detonation). I didn't have a timing light so I used the monkey method, this monkey doesn't recommend that method. :monkeypis

I thought Jwt cam and hot shot head "should" improve low end torque ( according to ser net ) here are a few thing I think of...

what kind of exaust do you use? Piping too big for na?
Got tune up yet?
Got new wheels? They might be heavier than your old one?
Finally....dyno mechine accurate?

Originally posted by Kenny-G
I thought Jwt cam and hot shot head "should" improve low end torque ( according to ser net ) here are a few thing I think of...

Well maybe not 'should' but keeping it close to the same would be OK too.


what kind of exaust do you use? Piping too big for na?

It's custom 2.25" piping with a Dynomax Magnaflo. It shouldn't be too big unless the new resonator is cloging things up. But usually backpressure will help low to mid torque.

Got tune up yet?

With only 37K km I don't think this is an issue. I did pull the plugs and take a look. They all looked fine. Except for the #3 cylinder that had a little oil in it. I'll be keeping an eye on it to see if this was just a fluke or not. They tunnel to the plug hole was dry but the threads had oil on them.

Got new wheels? They might be heavier than your old one?
No I made sure to put me stock wheels on. They even have the same rubber used for my last dyno run.


Finally....dyno mechine accurate?
Same one I've used since the beginning. I'd hope it's accurate. BTW how can you tell if it is accurate? It's not like there is an SAE calibration car driving around. :p:p

You got Jwt ecu yet? that should help refine the power band.

:eek:Ohh don't even start that with me!!!! :devil:

You know where I can get one for the 99 G20? :silly2: :silly2:

haha...JWT ecu heheh..:finger:

cool charts Jason.....dotn know about your low end torque issue..but 146hp at the wheels is pretty nice improvement.
i have access to a dyno around here so after my swap gets done, i'll post my chart too heheh

what...they don't make one yet? I thought our motor is the same as the 98 200sx ser?.....hmm...
Oh yeah even they make it , it is going to run you another 500 bills...
Hey if you are going to sell your header in the future, let me know...you know, I bet you will get it turbo charge or things like that.

Originally posted by Kenny-G
what...they don't make one yet? I thought our motor is the same as the 98 200sx ser?.....hmm...

They don't make one for the 98 SE-R either. :(


Oh yeah even they make it , it is going to run you another 500 bills...
Hey if you are going to sell your header in the future, let me know...you know, I bet you will get it turbo charge or things like that.
Well soon after JWT makes the 99 ECU I'll be starting to collect parts for a turbo setup somewhat like this!

http://www.b15sentra.net/sema.htm

:devil: :devil: :devil:

Oh yeah they fit a JWT ecu on there but apparently it took a lot of work to jury-rig it up.

146hp at the wheels is very impressive!!! :frog: great work. :D

im confused..........JWT doesnt havea ecu out for us (P11 owners) ??

JWT does NOT have ecu for the G20...i dont think they have any ecus done for the OBD2 ecus....i "think"...

I'm pretty sure they make one for the P10 (91-96) G20's.

Jason, how smooth is your engine after the cams? At idle position I mean.

Barely noticable. I sounds a little like it could do for a tune up. Just a very slight lope.

Someone in this forum is claiming that he can do the 1/4 in 12 seconds with only a intake. He said he even timed himself. Can you really do that in 12 seconds with only an intake?:alien:

Originally posted by graphXtrend.com
Someone in this forum is claiming that he can do the 1/4 in 12 seconds with only a intake. He said he even timed himself. Can you really do that in 12 seconds with only an intake?:alien:
He's full of sh...!

Originally posted by graphXtrend.com
Someone in this forum is claiming that he can do the 1/4 in 12 seconds with only a intake. He said he even timed himself. Can you really do that in 12 seconds with only an intake?:alien:

are sure he didn't mean the 1/8 mile :rolleyes:

Silly Question but have you got Cam gears on there as well?
New cams will need to be run with diffrent cam timing to stock.
It means another trip to the Dyno, but I bet you can reclaim most of the that low end.

Originally posted by Moppie
Silly Question but have you got Cam gears on there as well?
New cams will need to be run with diffrent cam timing to stock.

Careful not to generalize. JWT takes great care in making sure the billets are ground for the optimal lobe seperation. Others have had good success just droping them in. But in answer to your question, yes I do have cam gears and will install the intake gear soon with some recommendations I've seen. Hopefully it will reclaim some low-mid torque w/o too much loss up top.

gonna leave the exhaust cam gear stock?

btw, what kind of cam gears did you purchase? and do they have all the timing markings on them? I've seen some brands that dont, which much be a total guessing game when trying to dial in!

I'm going off memory right here but obviously I'll look up the specifics before I do the install. By advancing the intake by ~2 degrees I'll gain a substantial amount of low-mid torque but lose some top end...that's fine with me. BTW this only works with upgraded cam.

I bought JWT cam gears and they are an interesting setup. It's adjustible by where the cam 'nipple' fits into the socket.

Hey guys. Read all about it here. I'm certain he said 12 in the 1/4 mile. http://www.automotiveforums.com/vbulletin/showthread.php?postid=38267#post38267

Sounds like the bumpsticks are your problem. The Hotshot can't compensate for the difference that the cams are gonna make. Especially if you installed S4's. That's why I bought street grind Tomei's. Not as much high-end, but I'd lose a lot of hp and torque either. Either way, it's still pretty impressive.

12's? stock with an intake? maybe with no interior and driving off a cliff? even then i doubt it. someone help me here but this isnt possible. not even with me removing the oem seats for for lighter racing seats plus the carbon fiber hood and some other weight saving things i have done AND the mods can i hit 12 sec. 1/4's..
:finger:

it's IMPOSSIBLE on Earth to go 12sec with only an intake...but maybe he drove the car without all the body panels, windows, interior...bascially just the chasis...but still...that's still pretty impossible to do.
maybe on Mars...

12 Secs....YEAH RIGHT:rolleyes: :rolleyes:

MMMMMM....Lets Just think about it....

Add exhaust......down to 11's
Racing Slicks....10's
Maybe with a little NOS he would cut into the 9's
Cams......8's
Adjust timing........7's

Well Jason.....what have you done wrong then
:p :finger: :p :finger: ...LOL

Damn man I don't know. But you bastards are scamming my thread! :flipa: