Well I got my leaky exhaust valves fixed (some of you may remember that post), installed a Coolingmist kit and hit the track today for some tuning. I'm still not totally happy with my times, but at least I'm progressing. Mid 70's and sunny today, my best run was:

60' - 1.67 (on sumitomo's!)
1/8 - 7.88
1/8 - 85.00
1/4 - 12.41
1/4 - 109.5

That's 2/10's better that my previous best. I did have a 110.5 mph run, with a 86.7 mph 1/8. Mods are Hallman mbc, Injen intake and UICP, emanage (no timing control today), Buschur catless TBE, GSC 272/264, Coolingmist kit running 100% denatured alcohol. I'm hoping that when I plug the ignition harness back in I pick up some more mph. I un-hooked it to see if I could get any more timing up top and I didn't. A/F was in the mid 11's.

Thoughts?

 

Awesome launch, especially on crappy tires...wonder how/why you didn't spin. Also, great driving.

All you lack now is about 5 mph. You need to get the e-manage tuned properly for cams and alky. Once you do, you should be trapping 114-115 or so, and you'll be in the 11s with that kind of driving. If I can trap 114 without cams, I know you can beat that with cams. Do you know how to tune the e-manage properly for those mods? I know I don't...

 

Yeah, I'm happy with the launch and the et, the mph is where I'm frustrated. I thought I had a pretty good handle on tuning the emanage - the a/f curve is flat as a board and very consistent. I think timing is the area where I need to tinker next. Also, boost is still tapering which I don't understand. On the 110 mph run I hit 24.75-25psi in each gear and it tapered to 22-ish. I'll be doing another boost leak test tomorow just to make sure everything is good there.

 

Hmm, yeah, timing is the most important. You don't want to be mega-rich just to get timing, but it doesn't matter how good your AFRs are if you don't have great timing advance. When I'm on race gas, I'm seeing a lot of timing with a quick advance that peaks at 23-24 (22 by 7000rpm).

I don't understand your issue with the boost. You think a taper to 22 is bad? You do have the stock turbo and a basic MBC, right? I have never seen anything CLOSE to 22psi after 6500 rpm. When I'm on race gas, I peak at 24psi right after each shift and for about 1000rpm, but then it tapers naturally like it should down below 20 by the time I shift, which is at 7200 or so. If you are ACTUALLY seeing no less than 22psi by 7500rpm, then you have an incredible setup...way better than mine, but I am trapping 113.7 despite my taper to 18-19psi...

 

Are you running water or Alky? Maybe you should try leaning it out some more with the alcohol. Im running 11.7 with 93, so you should be able to run 12.0 or more with the cooling mist. Mid 11s and the alky will just richen the mixture. My car will peak to 23.5 and hold 22 to redline as well, Warrtalon. What kind of MBC do you have?

 

Hallman. The stock turbo is not usually capable of holding 22psi after 7k. Sean Glazar, the owner of Extreme Motorsports, was running 11.5 @ 119 on his stock 9.8 the same night I hit 12.01, and he showed me his AEM EMS logs - his boost was tapering to 17.3 at the top of 4th. If both he and I drop that low while still running amazingly fast times and MPH, then I have a hard time believing slower people are maintaining higher boost at high rpm. I think it's just different boost gauges being off...

 

Hmmm. well I'm not sure about the "slower" part, but I have the Zeitronix with datalogger, so I'm pretty sure it's accurate. I know people are hating on the 280's with stock turbo, but I swear by them, if you are into drag racing, they are defintely the way to go. The top end is insane. Btw. I have a DNA mbc, and it sucks.

 

Why not sure on the "slower" part? He's hitting 119.5mph on the 9.8 with alky and 93oct. There's a LOT of people that aren't even going as fast as I am with more mods who claim they maintain over 20psi past 7k, but then there's Buschur and Curt Brown who said even with the boost maxed they can't keep the stock turbo from tapering down to 20-21. I would think the AEM map sensor would be the most accurate. I didn't know the Zeitronix datalogger logged boost with a MAP sensor (or whatever it is). Yours is probably more accurate than my standard boost gauge, but my results are more in line with what Sean was seeing than what you are seeing.

 

I guess maybe I wasn't expecting a 3psi taper to be 'normal'. I'm running the Hallman Pro and I'm seeing 25.1 psi falling to 22.8 through the traps at 7000 rpm. This is being logged by the 3 bar map sensor hooked into the emanage. The timing thing is a little weird though. Looking at the Pocketlogger logs, timing is 16* in 2nd, 12* in 3rd, and 9* in 4th just before the TPS drops down. Very low numbers, but even with the boost turned down the numbers are only a couple of degrees higher. After examining the logs closer today, I am seeing some knock even at 21psi but I don't know why. The alky should take care of most all of that. I wonder if my knock sensor is goofy? At any rate I have more work to do.

 

Im not sure where you are getting 119.5 from, because I read 109.5. which in my book is not fast. My car is slow as hell, but for the stuff done, on straight 93, is pretty impressive. Most Orlando peeps were using alky to hit 110+, afaik. His driving is good, with a 1.67 60', he is granny shifting or? He should be trapping 88 by the 1/8 and 110+ by the 1/4.

 

No, no, I was talking about Sean Glazar from Extreme Motorsports - he hit 119.5 on the stock 9.8 with 93 and alky. This guy 992gnt is the one that isn't making nearly as much mph as he should, but who is driving wonderfully. He just needs to figure out his e-manage. He, like you, is claiming to see 22psi at 7k, when others of us running much faster aren't seeing NEARLY as much boost at 7k. I only see 24 at the peak in 4th, and it is down below 20 by 7k, but I still trapped 113.7 even after shifting to 5th. That's what I was talking about.

I'm not sure what is causing the discrepancy between some people seeing such high boost at 7k and others seeing 2-3 less.

992gnt, a 3psi taper hardly anything for the stock turbo and just an MBC. That's awesome, actually, but your timing is all jacked up. I see no less than 12-15 right after I shift, then it quickly shoots to 20 before 7000. By the time I shift, I'm usually at 22-23 and as high as 24 at the top of 4th, but this is on race gas.