Like it says, dyno'd my car today at 7psi. I think I'm close to the limit on my inj. 550's and 720's. Over the winter I'll be making some changes. I'll post the graph later. 254.88hp and 207.89lbs of tq.

 

Which turbo are you using ?

 

He is using Twin t25's.

Wait till you guys see the HP and Tq curve on this... It doesn't move, flat lol.

 

Brent this post is useless w/o dyno graphs!!!

 

I know! Trust me I've tried to post them but I can't get it small enough. If I send you or anyone the graph's will you post them for me? I'm not exactly a computer guru. Really don't have time for it. Unless it pertains directly to car's that is.

 

email them to vangelder.jacob@gmail.com or aim me 'crack addac' ill put em up

 

I just took some digi's of them instead but I'll send you the scanned copy it's a lot clearer. Thanks. These are the best I could do with my camera.

 

 

Thanks!

Brent

 

You sure put superchargers to shame. I'll see if I can find the Dyno sheet for my Supercharged 12A from a couple years ago to compare.

 

That would be cool Alak.

 

Any pics of the engine bay? I would like to see your setup.

 

Here's a couple. Not 100% complete, but I guess that's what the winter is for.LOL

 

Nice!!!

 

Wow, very nice torque curve! But you're flirting with danger running 12:1 under boost. To be safe, you really should be 11.5:1 or lower. Some even tune for just under 10:1.

 

LOL... I've got a dyno graph that looks just like that, only the numbers are 1/2 as big!

Are you getting knock readings at all? 12:1 is not necessarily a bad thing depending on your porting, ignition timing, and the internals you are running, and considering you are at 7 PSI. At 10:1 you are definitely leaving power on the table.

Numbers are just that. Tune to where your engine is happiest, or as the ol' addage goes: lean it out until it blows up, then back it down a notch.

 

Nice engine bay, It just needs some paint now!
You are running pretty lean topping out. You might want to richen It up to prevent detonation.

 

Looks like you are running a stock computer judging from the lean spot at 3700rpm

For 7 psi, 12:1 afr is not that big a deal with good intercooling and good engine temps. It looks like you were able to fix the leaning out at high rpm on later runs.

Just so you know Jay's engine didn't last very long with this 3700 rpm lean spot, even with the rest of the range tuned rich. Then again, his engine was built by A-spec, and had other internal problems.

 

I couldn't agree with you more. I've already richened up the lean spot. As for 12:1, in my opinion (based on talking to some tuners) it's plenty safe for 7 or even 10psi for that matter. 10:1 is too rich for any amount of boost, it makes the car stutter. At least anytime mine run lower than 11:1 it did. Richening the mix only helps prevent detonation so much, after a point, around 11:1 I beleive, it doesn't help anymore. I don't have the knock sensor's hooked up yet because I was running the 6port before and just haven't had a chance to run the wires. I just moved to a new house and shop a couple of weeks ago. So I've had my hands full. The intake side of the ic piping is barely above ambient temp. after a dyno run or hard pulls on the highway. Thanks for all the input guys, I'll definately take it into account. You'll notice that the hp doesn't change much when you richen it up but the tq shows it a bit more. The car pulls really hard even in 4th on the highway, I love it. I can't wait to up the boost in the spring!

Brent

Brent

 

That's the part I neglected to mention: The converse to what I said is the car will tell you when it is too rich, as the power will start to drop off. If you want to play super safe, richen it until the power drops off, then go back a step.

You've got the right idea, as too rich is jut that: too rich. You'll regret the tuning every time you fill up. Just ask the chris'.

 

I think Feds already said what I was going to say, but in my opinion, 12:1 is at the danger zone because it leaves very little leeway for mistakes/problems/whatever. Especially if this is the stock ECU since you have no control over how it adjusts for temperature. One cool night and you end up with issues...Personally I would never tune a turbo rotary for 12:1 unless I was trying to eek out every little last bit of power and had no concerns over engine life...

But whatever floats your boat.

Edit...I'm talking about under boost here. Under cruise, lean it out as much as you can without melting the turbos...

 

It was tuned on a very cool day to start with and I'd rather push mine close to the limits than experiment on a customer's. Besides, an established tuner gave a helping hand and advised me that he always tunes rotaries at 12:1. Bottom line, I'm not that worried about it. I have a hundred different builds in my head that I can't wait to try, money permitting of course. No matter how careful you are, if you push them, eventually you'll break ****. Tranny's, shafts, eng, same **** different pile. It's the chance we all take in the quest for POWER! LOL. How's that for cheesy?? You get the point.

If it lasts 2 summers, I'm sure I'll be board of it anyway. Thanks again. I really do appreciate the advice from all of you. The forum's been a great help.

Brent

 

Engine bay looks good in the winter spend alittle $ and get all your pipes chromed and what ever else you can take off that has a smooth surface I did mine and it looks great I would post some pics but I dont know how I tied before but couldn't not a computer guy

 

Thanks, I like the ss look though. Over the winter I'll be getting rid of the yellow crap and cleaning up a bunch of little things. Not to mention I'm going to build a new intake on the tb side, the one in the pics was made from my old na one. I'll probably get some stuff powder coated as well. I'd love to see some pics of your's.

Brent

 

that is a nice graph damn