I have not been keeing up, what is the fastest time now?

 

Nothing's changed with the 3.0L ...

But if you mean fastest A32 body.. then that would be JClaw @ IIRC 13.6 on streets.

http://www.forums.maxima.org/showthread.php?t=407152
http://www.forums.maxima.org/showthread.php?t=437581
http://www.forums.maxima.org/showthread.php?t=424532
http://www.forums.maxima.org/showthread.php?t=420506

 

I believe that tilley's best is 13.32 All Motor

 

But he wasn't on streets. http://www.forums.maxima.org/showpos...90&postcount=7

 

I may now have the fastest 3.0 on street tires then. 13.7@102 mph. There is more left in it too, I was hitting the rev-limiter in 3rd gear 15-20 ft before the line, and it was killing my trap and times. I borrowed asthamax11's ecu with 7200 rpm rev-limit instead of my 7000 rpm and it fixed the problem, but I only made two passes and neither one was a clean launch. My trap went way up though. I need to replace my tires or have my ecu reprogrammed.

 

I'd say you are the fastest street tire N/A 3.0L.

ECU reprogrammed for???

 

more rpm's.

 

That's what I figured .... Ever think of the SMT-6 for some timing, instead of the old cookie cutter method ... Also, if you did go with the SMT-6, would you still be able to use the JWT for more revs?

 

you guys pass your information on in the thread im making, putting together a rankings list.

http://forums.maxima.org/showthread.php?t=449296

 

Hey Matt,
I know you don't want to dump any more cash into the max but if I were you I'd send my ECU back to JWT so they could reprogram it for 7500 rpms. I bet you're still making power that high.
I bet a 13.5 is easily yours if you could shift 7500 in 1st and 7200 in 2nd. (and another 2.1 60 ft)

 

LOL that was my ECU! That ecu is teh winnAr!

My quickest was 13.83@102.x

Post the whole slip i want to see the 60' and what not.

 

it's a small world alright!

 

I knew it was your old ecu. I should have borrowed it earlier in the day, but it was a last minute thing. It did help me get a new best trap speed.

60ft...2.185
330...5.983
1/8...9.011
mph...80.44
1000.........
1/4...13.794
mph...102.11

 

Traction was bad, so another 1-2/10ths is very possible with your current set up.

Maybe you should come down to Silver Dollar Raceway on their first test and tune day, Jan. 28th. The track should be prepped well.

I'll be there with the GTO guys again.

 

Great time for a 3.0. The second 1/8 mile indicates you're making good power. Are you able to do the entire second half of the track in third gear?

BTW, what is the fastest All motor/Street tire time with the stock ECU?

 

I think it's probably theblue from way back, he ran 14.28 or 14.29 with I/Y/E. I'm racking my brain for someone quicker but I can't think of any (street tires).

 

I didn't know the ECU made that big of a difference (with mevi I imagine)

 

Cartest says .4 seconds all else being equal, why do you think I bought it lol. My best with MEVI and stock ecu was 13.999 - 1.91 60', with ECU it was 13.43 - 1.87 60' so yeah it makes a huge difference.

 

Do you think that could possibly apply to a VQ35 in similar conditions?

 

I dunno. Didn't I already test an extended rev limiter for your car though? Or did I just mess with gearing?

 

Gearing. And I thank you for that. It tipped the scales on one side and motivated my decision to "not fear the gear". The only case that I know of anyone having a 7k+ rev cut AND a different/modified IM on a 3.5 is SR20DEN, and we all know how that worked out for him (his time should be added to the list, it's a benchmark), but there were too many factors (tuning, weight, parasitic loss) to dissect how much of it can be attributed to the rev cut/IM combo.

 

Were you the same race weight for both those times? 4 tenths seems like a lot just for an ECU. Maybe at 2800 lbs, but not at 3200 I'd wager.

 

i want to be first in a class as well, lol ! what is the fastest 3.0L on street tires with USIM ? lol, anyone ever beat a 14.00@99.52 mph with this setup ?

 

The car was heavier by like 30lbs when I went 13.4. I didn't have a CF hood anymore. The car would have been right about 3050 with driver if my memory serves me correctly. Someone could search for the post and it would probably say the race weight in it because every time I run I try to weigh the car, or at least give an estimate. I ran that time april 5, 2004 so the post would be around that time. I had also added a catback too but I don't believe that makes much - if any - difference.

13.43 @ 102.3 - 1.87 60' - I/Y/E testpipe mevi ecu - 40ish degrees, DA was like -400 feet iirc - 3050lbs est - April 5, 2004

13.62 @ 101 - 1.91 60' (memory) - I Y testpipe mevi ecu - a little warmer ~50ish, dont know the DA - 3050lbs est - Oct or Nov, 2003

13.999 @ 98.4 - 1.91 60' - I Y mevi testpipe - 40s or 50s, I remember wearing a coat - 3020lbs est - Oct 2002


Almost every who added ecu to their mevi car got exactly the same sort of gains, .3-.5s. DaveB, MikeD, Mr.Cranman etc. Cartest ain't lyin'. Pretty much everything I've ever done on the track (besides this FI crap lol) has been tested in cartest with regards to the MEVI, ECU, gearing choice (slick size), and decisions about my mods based upon those tests, and then the real world numbers have mimicked those cartest #s almost precisely.

 

The Chariot is the USDM IM Champion.. well, as far as this site and its postings are concerned.

 

I think you are. Fastest I know of besides you is vqdriver @ 14.05 @ 98, that dude can pull a 60 man. He pulled like a 2.09 on that run and has pulled alot of 2.10, 2.12, etc. I've never cut a 60' like that on street tires. Too bad he got rid of the max for an RB powered 240 and a G35.

 

feed me some data and i will run some extended rev limiter tests if you want. let me know what criteria to run the tests under (gearing, same dyno as before or different, etc).

 

true, out of 25 passes maybe more the lowest 60 i can get here is a 2.18 which if i could pull a 2.12 im sure that would be enough to put me in the 13 second club, i got some more races left this season so im going to give it heaps and see what happens. sad really low 2.1x were easy back home. Boo ! hiss !

and how in the world did that guy get such low 60's with street tires ? does he have a book or leaflet out on the secret to launching a fwd maxima, rofl !

 

its just technique. you can't read a book on how to ride a bike you just have to try it, some people are naturally better at riding bikes than others.

 

Hmm. Ok, I just always had .3 stuck in my head as the expected gain for some reason but never ran CarTest specifically for an ECU so I thought perhaps .4 was a bit high with a heavy car but I guess not. I could not really verify on my own car as I added a few things at once including the ECU plus my JWT is not that extended (only truly goes to 6900 and that hurts me). I was going to get it reprogrammed but now with the EU I'm morely likely to just sell it eventually.

JClaw, if you ever need CarTest sims run and can't get hold of Neal, I also have the program. And I have DragRacing Analyzer Pro too. It's a bit better in some aspects than CarTest but they generally agree as long as things are set up right.

 

That would be cool. Let's use ULISES' dyno for referrence point: http://img.photobucket.com/albums/v2...A/scan0001.jpg

Could you use that dyno but inflate peak to 270whp (everything else relatively inflated). Raceweight 2850 including driver. 7000 rev limiter (vs stock 6550). 24.5 slicks. Gearing:

1st=3.28
2nd=1.85
3rd=1.27
4th=0.95
Final Drive=4.47

So this should give us a "best case scenario" assuming the driver can live up to the potential (now that's putting weight on my shoulders)...

Maybe you could run the same test w/variables shown above. Then we could compare to Neal and see how the results differ. It'd be interested to have a direct comparasion of both programs/methods for the same car/variables.

 

With 270whp @ 6200rpm and 260tq @ 4800rpm and the rest of what you described

stock rev limiter:

1.78 60'
7.86 @ 89.0mph
12.29 @ 113.0mph



7000 limiter

1.76 60'
7.81 @ 90.0mph
12.23 @ 113.8mph

Extended revs don't do much for a car with that gearing and powerband. I tried 7200 for fun and it gave me 12.20 @ 113.7 and 7500 12.20 @ 113.5.

 

Wow. That's just... way beyond what I'm expecting to run...

 

That part is even more crucial. And very surprising.

And hey, remember that discussion we had about launching from second? What happens if you chop off 1st gear althogether? What happens if you replace slicks with stock tires and have it launch in the 1.85 gear?

Well thanks anyway. I may end up keeping my stock rev limiter after all, or maybe something conservative like 6800.

BTW, did cartest give you an 'optimal' launch RPM?

 

Yes it does but I don't trust the "launch technique" in cartest very much because I am usually making up the bottom end of the dyno off the top of my head, because most people start their dynos at like 3000rpm, so anything below 3000rpm (or whatever it is on the dyno I'm using) I just have to pull out of my ****. So if it says the optimal launch is done at say 1200rpm, it's basing that some crap that I've made up myself. All I do is manipulate the launch technique to get a realistic 60' time.

Also launch techniques vary so much, and the program is so precise that it can never mimic the real world line between traction and spinning at those low speeds. Cartest keeps your car at the absolute limit of traction for the entire time that the wheels are in danger of spinning, manipulating the throttle in ways a human never could, so it can come up with some unrealistic 60' times. So I just do the launch myself usually and come up with a realistic 60' time for the situation, so as not to throw off the run with some crazy 1.9 60' time on street tires like it gave me for the setup I just tested for you.

Also, as cars start getting faster, above 110 or 115mph traps I think cartest starts getting a bit optimistic with the traps. My turbo car, with the power I "estimate" it puts down is telling me it should trap like 118 whereas I've never trapped that high and probably wouldn't without about 30-40hp more based on the races I've had with other real world cars. It tells me Mikes car should trap like 113, but he has only managed 111, it tells me my buddy brians 350z should trap 122, but he has only managed 120, etc. So that trap might be a couple mph higher than is realistic, but as far as determining shift points it's great at that, because those are based solely on your gearing and your dyno (you could do them with a calculator if you wanted and you'd get the same results), so as long as there is an accurate dyno in there, the shift points it spits out are spot on.

 

right hear guys official street radial time 13.35

 

Again, people are asking about REAL street tires. Not purpose built drag radials. :


Maybe we should change this to "Tires that you can PLOW through large puddles of water with".

 

I've noticed this too. And I do have accurate dyno info from 2000 rpm on. It only gets more problematic if you start trying to model slicks or DR's in CarTest. I find DragRacing Analyzer a lot better in this regard. It has algorithms to estimate typical traction conditions found on dragstrips and launching techniques using all kinds of tires - slicks and DR's included.

For example, once I set everything up properly in DRA, I did some runs based on slicks and they were pretty close to real world. Launch point was between 4000- 5000, and ET's and traps were close too. Then I switched over to CarTest and tried to do the same thing and it gave me a launch point of like 1900 (yeah right) and the 60's were .05 to .1 too low and the trap 1-1.5 mph too high. To get realistic traps it helped to drop the tire pressure down but I had to really play around quite a bit to get a comparable 60 ft.

For street tires CarTest is adequate but DRA is a better model IMO when it comes to drag racing, especially with slicks or DR's. It can pick optimum shift points too etc however CarTest has the edge when it comes to doing parameter sensitivity analyses or overall evaluations such as top speeds, power loss curves, speed in gear curves etc. But DRA can help you real-time at the track as it allows inputting of weather conditions/elevations, automatic calibration to match your results, and prediction/adjustment of dial in's etc. They compliment each other well I suppose. Neither one will be perfectly accurate but they're useful tools.

 

I see your point but I definately think 1.9 is possible. I almost made it with the super-high idle (1335-1340 rpm according to Jime's OBDII scanner). Strangely enough, the completely coincidal idle seems to be the optimal launch point on street tires. I'm not complaining lol

Oh it's definately optimistic. My car's not getting anywhere near 12.2's N/A lol I set myself a 12.99 goal and to be honest I was secretly hoping for some 12.70's but low 12's is just way out of the radar. I will bow down to whoever pulls 12.20's in an N/A maxima, and nobody would ever believe it anyway. We'd have a long, drawn out "track timing malfunction" discussion about it.

Why don't you tell us what you run on stock tires instead, like I did.

Drag radials should be put in the same category as slicks. They are MADE for drag racing, and should be classified as such. You can pull 1.8 60' in a FWD on DR's, I'd like to see someone pull that on true, 100% all weather/good threadwear street tires with an actual sidewall in a maxima.

 

My 12.859 run was done on DOT approved tires (ET Streets) too. But I just call them slicks.