JFK78

A few things you need to know before assuming things about this car and what it should run based on seeing the dyno chart:

This car was de-tuned from the dyno session to ensure a large safety margin as per his request, and is also likely running super rich at his elevation (~2500ft) vs the AFR's it was tuned at down here. Likely around 50whp less than we dyno'd it at.

Gearing is also way off for the 1/8th mile, he's still got 20mph to go in 3rd when crossing the line. With the above mentioned things in mind, and crossing the line at ~7400rpm in 3rd, it's probably only laying down ~350whp in 3rd by the time he hits the stripe. Lots of other things going on here.

This is a prime example of why internet bench racing = fail. So many factors playing a role that most of the people reading don't even realize, know about, or take into consideration.

gringotegra

I didnt say what it should be running based off the power it made now did i?

Just mentioned what i thought it would trap since it is trapping 92-93 in the 1/8th.. But since you mentioned you think its making 350whp ish, then i will throw out my internet bench racing math and say thats pretty close to what its trapping ...

Crossing the line at 7400rpm?? Is that by going off the stock tach??

Again i will throw out some internet bench racing numbers and say that the stock tach is probably off a good 5-6 mph at the same rpm due to the taller 24.5" tire...and if it was crossing the line at say 7400rpm like you said, well "assuming" it has a gsr tranny then it would only be going 85mph give or take...with the 24.5" tire..

But then again, im just an internet bench racer thats never been down the 1/4 mile...



Back on topic, car looks fun

vectorsolid

regardless of the bench racing... I had a good time. and all things considered, for a first time out to the track, once I found an acceptable tire pressure, the passes were relatively consistent (for me). the 60's were very close.

I stayed in it quite a LOT longer on one pass, way past the 1/8 line (I've got some in car video I'm having trouble processing that showed it). It still wasn't close to banging limiter. I bet I went another 150-200 feet or more. 100mph is roughly 150 feet per second.

for a street car daily driver... I'm tickled pink.

would like to tighten up everything related to the shifter linkage... that stuff sucks in this car. I'll have to poke around under there.

gringotegra

i dont doubt that its fun to drive at all, my car makes the same power and weighs almost the same so i know what it feels like ... I didnt mean to sound like an *** if i did, was just saying what i thought it would trap if its going 92/93 in the 1/8th... ive done enough passes in my car to know what it does...

didnt mean to clutter your thread

JFK78

Myles, I wasn't meaning to call you personally an internet bench racer (we both know you're not), although looking back at my post it sure does look like it.

I just like making sure people know what was really going on, and started getting preachy about internet bench racing, not meaning it towards you directly. My fault, I apologize for that.

gringotegra

James, No problem..

This car looks like it will be in my class for IFO! gunna be some good racing!

vectorsolid

Don't think we're bringing it, just the Hotrod car and the EF-Bomb. Although... Maybe I should bring it so we have another spare trans and spare 5.9's ...hmmm...

narfdanarf

I've got you covered on the spare trans/axles, because my cars not going to be done in time.

gringotegra

I need spare trans

vectorsolid

2nd track day... absolute fiasco. I put the better tune in it that JFK had for the car. I'm just having a bear of time getting bite on top.

Missed shifts every pass except the first pass. Blew out the tires in 2nd gear, rode it out, and still turned a 7.55. Would have been a sold 7.20 with bite. It rode the limiter for what seemed like 2-3 seconds blowing the tires off. *ugh* I just let it ride, thinking, "any instance now, it's gonna bite... not".

Found out what's going on with the shifter linkage (AFTER loading it on the trailer)... lot's of stuff needing replaced down there. I might machine some good bushings and really tighten it up.

*sigh* Here's the numbers from today with a more aggressive tune: (and the shifter linkage failing)

6-27-2010
60@1.716 - 7.551@93.75 , blew out 2nd, and rode it out. technically not a bad pass. I think woulda been a 7.2@96
60@1.763 - 8.205@81.96, missed 2nd and third... no traction
60@1.869 - 8.647@89.10, missed 3rd., no traction
60@1.773 - 9.353@80.78, Missed 2nd, no traction in 2nd or third

compare to last time:
60'..........ET...........mph
1.735-----8.069-----89.11 (blew the tires off in 2nd and 3rd, missed 3rd)
1.692-----7.640-----89.46 (spun, let off in 3rd until it caught and planked it again)
1.700-----7.830-----88.93 (blew out 2nd and third, tires 7.5-8psi, missed 2nd...)
1.694-----7.449-----93.75 (tires at 5.75-6psi, stuck it pretty well in 2nd- 3rd.)
1.707-----7.883-----74.63 (this run felt GREAT... missed 3rd.)
1.711-----7.570-----92.40 (good shifts, tires at 5.5, hotter, in the afternoon)
1.743-----7.611-----92.78 (good shifts, tires 5.75, car was warm, hot lapped).


All of that crap was related to missed shifts and blowing the tires off in 2nd and 3rd. Ran the tires in the 5.5-6psi range. at 8psi, there's nothing for bite. been up and down in PSI in .5psi increments and 5.5-6psi is where I have any bite.

I'm getting a really strange feeling the slicks are done. I shouldn't be blowing the tires off with only say 450whp. Interestingly, last time at the track the car felt more consistent with a more conservative tune, say 380whp. Less blowing the tires out, more hooking up. Hmmm, guess what that's pointing to as well.

On both of the last 2 race days the first 3 passes were more "loose" blowing the tires out in 2nd and 3rd than the passes at the end of the day. and traction was better by the end of the day with the same tire pressure. I was originally giving the track credit for rubbering up. Maybe the slicks are done and it takes 3 passes to get a minimal amount of traction out of them.

Hmmm...

cloviskilla

iTrader: (2)

sweet build i miss my old flat black beater.

vectorsolid

Ain't that how it goes... I miss that rex... ...lol... I was to lazy at the time to just spend some time with it. I should finished it. Now I'm looking for a rex again to replace the "EF-Bomb", and they're all crap. and more money.

I think the throttle body and rail of the beater ended up on this car.

vectorsolid

It's a proud day! Chassis cert'd. My 3rd one... It's stressful watching the dude with the sonic tester... and your thinking... "PLEASE be the right wall thickness, please be the right wall thickness...." ...lol...

Ricky at Speedfactory FTW!

vectorsolid

some in car fun. from a few weekends ago.

http://www.youtube.com/watch?v=Vwu-IA110u4

vectorsolid

Got some new wheels. I've been wondering about Weld 13x8 wheels compared to Lenso's. I took a bunch of pics and plan to start a thread about that.

Anywho. I'm done taking this car to the track until I get a new transmission. When I first took the car to the track, I was missing shifts between 8000-9500rpm, I blamed myself for not learning the new setup yet. Used it that way a few weekends, trying to learn it.. FAIL... The missed shifts were still bad, I'd say 50% of the time. I recently found a fair amount of linkage slop. Built new linkage, figured that would cure it. Took the slop out but still can't be flat foot shifted or shifted fast on top without grinding. I've finally decided, It's not me, I have other cars I haven't missed shifts on in ages. Transmission is toast.

Car will make a pass if you short shift 1st, and subsequently fall off boost. 2-3 is better than the 1-2 but still can't be done wide open. Gotta basically lift shift, and short shift right now to get a pass.

The TRANSMISSION is finished.... I'm not making anymore passes until I get this thing UTTERLY worked over, syncrhos are shot. It's now ruined more than 3 race weekend for me... what's that worth to a person?

Back to todays running. Even with the bad shifts, the new tires helped a bit on the Weld wheels.

Tires worked good at between 8.0-8.25psi

60-1.766, 7.434@96.15
60-1.714, 7.899@92.98 (missed gears)
60-1.683, 7.383@94.94 (best run to date)
60-1.692, 7.781@92.21 (missed gears)
60-1.733, 7.488@94.93
60-1.775, 8.698@74.37 (missed everything and gave up)
60-1.725, 7.872@91.27 (missed gears)
60-1.756, 7.662@92.78 (lift shifted)
60-1.782, 7.765@91.64 (missed gears, long 3rd gear burnout)

v8_BROmaro

455 whp is legit in a gutted hatch.
nice build.

vectorsolid

Here's a video of the last pass of the day, 7.7@91.6


Some Random pics from the days fun.

On the last pic the dot on the tire was inline with the valve stem at the start of the day. I'd say it moved about an inch a pass or so. I was curious about how much they'd slip without screws. Normally I screw 'em.

vectorsolid

Gutted? I've got everything but the back seat and the spare tire. all the factory sheet metal, panels etc (although a vent fell out of the defroster. I need to address that). Still power sun roof, power mirrors, CD player. The lap of luxury and comfort.