RMcElwee - 350 HP LS1 Miata (need help with tuning / EFILIVE)

[04ctd]

Originally Posted by rmcelwee

It is a walboro255.

what size lines?

filter new, or used?

AFPR or stock FPR? pressure gauge & readings?

[ElecTech]

Originally Posted by 98nbmz

Stock ls1injectors are good for over 400 HP doubt it would be them. Could be the miata pump though. Using the stocm miata or walbro?

Not true. To the crank, but not to the wheels. I have seen the stock injectors over 90% with just a cold air intake and headers. They may not go lean, but they are being overstressed.

[Jeff@HHP]

Originally Posted by rmcelwee

First day, first post - My name is Robert McElwee and I live in Moncks Corner, SC. I'm not a big gearhead (only a shade tree mechanic) but I've always wanted to build a V8 Miata. I found one that was already built with an LS1 and T56 from a 2000 Trans Am (springs and cam are the only upgrades) and couldn't pass up the price. I was not happy that I didn't get to build it myself but I have purchased a nicer looking Miata (the original one is completely trashed) and will swap everything over so I guess it is kind of the same thing. I put it on the dyno the other day (graph below) and it is running a little lean. I was getting ready to get it tuned and a friend told me that I should just do it myself with EFILIVE since I am only wanting to fix a lean spot. I've done some laptop tuning before on a turbo miata with a full replacement ECU so this isn't a huge issue for me. The only thing is I am unfamiliar with the software/cables to get this thing hooked up and searching on the net has been a nightmare. Anyone here that can help me? Thanks!

Robert,
Are you still coming in Saturday?

[98nbmz]

[/LIST][/INDENT]

Originally Posted by ElecTech

Not true. To the crank, but not to the wheels. I have seen the stock injectors over 90% with just a cold air intake and headers. They may not go lean, but they are being overstressed.

I worded that wrong really. Most people don't ditch stockers with a small/mid size cam. My previous car h/c ls1 made 440 rwhp on stock injectors, 110th duty cycle yes, lean spots no. I was just saying I doubt the injectors themselves are the problem for the lean spot.
Let me know if you make it to the shop today ill stop by and lend a hand

[Carlrx7]

Originally Posted by rmcelwee

I might get with you sometime on the tuning. Should be pretty easy to just add a little fuel here and there (or at least it has been on the other brand ECUs I've tuned).

you think its easy until you come across a tune that has been royaly hacked up.

[rmcelwee]

Originally Posted by Carlrx7

you think its easy until you come across a tune that has been royaly hacked up.

That's pretty much the same with everything. I had a Miata "professionally tuned" one time. Took 4 hours and before I left I loaded my original tune back to the ECU. I've been pretty leery of letting people tune my cars after that but I am going to give HHP a try tomorrow. Hopefully I'll have a smile on my face afterwards.

[rmcelwee]

Well, I took the car to HHP today and they tuned out the lean spot. They said the injectors were running around 90% duty cycle so that is something I will keep in mind if I ever upgrade anything (doubtful - car is strong enough).

The new tune vs lean tune: