tom94RX-7

iTrader: (5)

10.39 @ 131.93 with a 1.39 60 ft! Today I ran pre turbo water injection, pump gas, 24 psi boost. 11.6-11.9 AFR during this pass. Time slip and video below. Check out the reaction time too haha.

5 other passes in the mid to high 10s today. I was trying a few different things to get traction in first gear, this run was about perfect. Also had a 1.44 and 1.48 60 ft times today, but 2nd best ET today was 10.61 , I ran lower air pressures today which helped, about 10-13 psi depending on the gauge used.

I guess I'll have to go for 9s next year.

http://www.youtube.com/watch?v=0oDWqPHjUsg

Narfle

iTrader: (16)

Awesome pass!
Sounds like you're got some gear left. What rear end ratio are you running?

tom94RX-7

iTrader: (5)

Thx. Ya plenty of gear left, 4.10s

RCCAZ 1

iTrader: (10)

Wow.... impressive run Tom. Probably one of the best launches I've ever seen with an FD. What RPM are you launching at? Stock rear end?

tom94RX-7

iTrader: (5)

The Crane 2 step rev limiter was set at 7500 rpms but it logged at about 6700. I released the clutch with about 11-13 psi boost, revs dropped to 6100 with boost then at 20 psi, revved out to 8100 with 24 psi. TII rear diff in the stock fd housing, stock axles and stock gears. Banzai diff brace, stock rear springs, Koni Sport shocks softest setting, rotary extreme toe links & trailing arms, solid diff mounts. Tilton clutch flow control valve=awesome.

I think the front tires definitely came off the ground, it looks like it and the car turned a little unexpectedly which it usually doesn't do.

djseven

iTrader: (56)

If you hit 9s on a 67mm turbo and pump gas that would be unbelievable. Hell your times are already incredible. And to imagine, all this on small street ported engine with steel seals, pump gas and tuned by yourself. Keep up the great work.

tom94RX-7

iTrader: (5)

Thanks! I'm sure I'll need like 3 to 4 more psi boost, I don't even know how far I can go with this turbo? Probably need a lot more hp to hit 9s, will my motor hold up? Haha. I need some bigger injectors to run more boost. My tuning skills are always improving haha.

MOBEONER

iTrader: (18)

just simply awesome

Turbo8

iTrader: (17)

Awesome man!

just startn

iTrader: (33)

You can hit 9's on that 67mm...please do

v5e_nsx

speechless.

awsome run. 9sec, let us know how you will do

tom94RX-7

iTrader: (5)

Thanks guys. Has anyone hit 9s with a 67mm turbo? I was thinking maybe I should get a larger A/R turbine housing to make more power in the upper revs for drag racing, it's a .96 now. I think I need to get up to at least 136-140 mph. It took me like 4 years of running low 11's with the stock turbos to finally hit 10's, so if I make 9s my next goal I hope it don't take that long haha, but I know it will be hard.

tom94RX-7

iTrader: (5)

Now I have a .96 undivided turbine housing, I think I'm gonna buy a 1.24 A/R garrett divided housing for cheap, from what I have read that should be more power for drag racing (matched up to my divided manifold), not really concerned about longer spool up time on the street, just have to be in the right gear to get the quick response.

JonnyQuestions

iTrader: (8)

Great job Tom, hows that tilton valve? Im thinking of getting one. which orfice you using

tom94RX-7

iTrader: (5)

Its great, with it and the crane 2step it makes launching the car super easy, fast and consistent. The only thing I do now is change the amount of time holding it full throttle to build more or less boost on the 2 step, trying not to overpower the tires and spin too much, and I only hold it full throttle for a half a second or less then drop the clutch and the tilton flow control valve makes the clutch engage a little slower so it gives it a good amount of slip to launch good and no worries of breaking anything even with low tire air pressure and traction. I use the .028 orifice, the larger .040 didn't really feel any different than stock.

Update on my car, I ordered a 1.32 A/R turbine housing and I'm getting a custom 4" exhaust made for it now, downpipe and a magnaflow race series round muffler in the midpipe part # 14163. I'll use that for drag racing and getting my 3" greddy catback modified to bolt up to the 4" midpipe with a vband to use that for street driving. Going all in lol. Hopefully this will make more power with the high boost levels, it should decrease backpressure in the exhaust manifold/turbine housing and greatly reduce it after the turbo.

JonnyQuestions

iTrader: (8)

Very impressed with that Stock drivetrain holding up. You def getting me sold on that tilton valve. Tom, you have any datalogit logs of your latest dyno run or 10 sec passes?

tom94RX-7

iTrader: (5)

Ya here are my maps and datalogs from my 10.39 pass, see attachment zip file. I'll get back to the dyno asap after getting the exhaust done and the new turbine housing. thanks.

JonnyQuestions

iTrader: (8)

Thanks Tom! Im still learning tuning myself. So the more info and examples, the better I get at it

JStrib

iTrader: (6)

Very cool.

JonnyQuestions

iTrader: (8)

Looking at the map I see the section on the leading timing map that you changed. Since the trailing is cut off during 2 step then it doesn't matter what you put on for the trailing map in those cells, right?

tom94RX-7

iTrader: (5)

Ya, I can't look at it right now but the split should be like the same as other cells around it, shouldn't be negative split since those cells may get used at other times besides for the 2 step.

tom94RX-7

iTrader: (5)

Oh nevermind I see I added more split in that section of the map for the cells that are used during the 2 step, I forgot about that haha. So ya actually that's not needed I could have let the split be 6, 8 and 10s, but it doesn't really matter.

smg944

iTrader: (34)

i need to setup my car better for launching. i can only dream of cutting 1.6 60's nevermind a 1.39 that is sick. im running a billet 67mm turbo. my 1 only clean run was a 10.69 at 139.88mph with a 1.91 60'. i did run a 10.55 on the 2nd pass with a 1.78 60' but had a slave cyl issue and it wouldnt fully release the clutch.

tom94RX-7

iTrader: (5)

What's your setup for launching? What dyno did you make 525 rwhp on, seems like you should be making more power than that to go 140 mph which is awesome, unless it's just the better turbo compared to mine that helps you.

smg944

iTrader: (34)

I don't have a 2 step or a clutch valve. I'll be looking it to those at some point. I made that power on a dynojet. All the dyno types in my area read the same. We tested a dynojet , mustang dyno , dynapack, and a land and sea dyno with a friends cobra and all were 435-440 whp. I think he got the highest number on a mustang dyno. For comparison when I made 450whp with my 35r I was trapping 131-132.