Dyno Result
 

I finally got my car dynoed at a dyno day. My car is currently running:

STOCK EXHAUST!!?!?!?! OMGzzzz
Devil's Own Progressive WI
GT2554R
MegaSquirt 'N Spark
Ebay stg 3 clutch
bunch of other shit that doesnt really matter....


I dynoed at 15psi. It held at 15psi to 5k RPM and dropped to 14ish psi. My timing advance in boost is a constant 14deg above 8-10psi. Below that it is greater than 14deg. I started losing power with over 14deg so that is why I stopped there. My intake temps with the water injection are never greater than 77deg F at 54.46deg F outside temp. I expect that the stock exhaust is robbing me of at least 25-30HP and is probably the reason for the decline in tq above 5k RPM.

Also note that the afr reading on that graph is off. The wb they stuck in the tailpipe kept getting rocketed out the exhaust because of the extreme pressure. I datalogged all my runs and my afr's are a perfect 12.2-12.5 at all times.

thats one flat A/f ratio.. very impressive!

I wish i drove it with 15psi vs the 5psi. Looks great! https://www.miataturbo.net/forums/im...es/bowdown.gif

Post up your AFR datalog, I'm very curious for obvious reasons. You're making me want to hurry up my rear-end conversion as quickly as possible.

For stock exhaust, that's amazing. I'm sure their sensor kept coming out of the tailpipe because it's practically a plug for the stock exhaust. :gay:

lmao...impressive

what manifold dp..?

anybody have any idea what he'd make w/ say 2.5" exhaust, no cats? ;)

With a larger exhaust you will pick up a ton of power. The stock exhaust especially @ 15psi is choking power off really badly. Good numbers though.

nice numbers.....oh to be at 15psi!!!!!

nice numbers yeah next time drop the exhaust at the cat and give er a go WI seems to be sorted very nicely, Where and how did you get your ait numbers from. Also with cooling going on like that you need to try for 12.5-1 or more instead of 10-1 this is probably costing you alot of power lean that bitch out and youll be 200+ easy still good job.

someone didn't read. :gay:

Doh well it did seem something is holding him back maybe the timming is to conservative i dunno he certianly has alot of room to play with it.

i tried more timing and started losing power, thats why I didnt add more. You're right though, I didnt even think about just dropping the catback.

where's that AFR datalog Brian?!


Sidenote: Got the diff pulled apart for the LSD swap! Waiting for the meatball to arrive.

I know but maybe it is in the rate or rpm specific us oems have a point at peak torque where timming scales back a few degrees and then continues on, perhaps this isnt a totall timming issue but an issue of rpm specific timming at one point or another inhibiting your totall power the 2554 is a small turbo but still i expect more at 15psi, esp with a MS. I dunno then agian is the shop you used reliable, and have you dealt with them before dyno setup can efect your results by 30+-%. How did the car act on the dyno was it laboring excessively.

I told that guy to give me a paypall and i still havent heard from him i hope he calls back soon :(

I too would expect more power @15psi, but he did say it had a stock exhaust...and thats gotta hurt a LOT. I would expect it to make like 240ft/lb though so its way lower than normal.

I think the exhaust will also help a lot with spool/area under the torque curve as you spool really late for a gt2554r. 150ft-lbs by 4k rpm is about what my GReddy does and the gt25 should spool waaaay earlier. Bigger exhaust and that setup will be kick ass (not that it's anything shabby right now). :)

Nice numbers. With exhaust it's gonna be nasty!

I'm guessing we'll get to see the post-exhaust dyno to see just how much it'll help. Sweet.

You're spraying water not meth? Curious.. Amazing what you're able to do with the water at any rate.

The stock exhaust is a 1-7/8" IIRC.... that's pretty damned small.

Its wiper fluid, so yes there is methanol. I didn't mention it specifically cuz I thought it was implied. On a second note, I'm now having some difficulties. My WB is reading that I'm rich now for some reason, so it either needs to be recalibrated, or the high loads of the dyno and the high duty cylces I have to run at high boost cleaned out my injectors. Also I was just making some passes down the road to give scott his afr logs and now apparently my pcv valve is bad cuz Im spewing oil out of the front driver side breather. Also my oil pressure gauge is going NUTS in boost which is probably correlating to all the oil on the bottom of my hood and all over my turbo. So I need to sort a couple things out before I can tell you all for sure whats up.

Looking back on my logs from the dyno though it looks like my logs got consecutively more rich, yet the maps I tried only changed timing and not fuel. I dont have any exhaust leaks before the WB sensor either.

maybe you are PIG rich and your WB02 has been showing an improper reading. Are you running a restrictor for the oil feed on your turbo?