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#431: New GVR4 record holder - info & vids

NateCrisman

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Joined
Nov 22, 2008
Messages
2,054
Location
Blairstown, NJ
Youtube Video: http://www.youtube.com/watch?v=4Zpb71tf7_4

smugshot2055666-L.jpg


We knocked off a clean pass at Etown on this last sunday, Nov 20th. We changed to a larger intercooler core, changed the rear suspension to the D2's (from KYB AGX & soft GC coil over sleeves), and set the alignment to zero at the car's maximum launch attitude. Boost was set back to 40psi and the plug gap was put to .014. Now the air temps are more reasonable at just over 100*F at the traps, which accounted for about 2mph gain at the same boost level compared to the 144mph run that had max AIT of 156*F. The rear suspension was worth some stability on the launch too, as it now leaves straight and doesn't crush the back end down. With the AGX/GC suspension it would slam the rear end down, cause the camber to go way negative, and seemed to bounce back up and upset the car. Now it just hooks and goes straight with no drama!

Unfortunately, we broke something in the trans (stock automatic), I think likely the front diff or the center transfer gear on the next pass. After the 9.3 we hung around a while expecting the tech guy to come throw us out, thankfully he didn't show. So we did the pre-run retune and got it ready to try and improve on the 9.36. I added a few psi of boost, one degree of timing, and turned the shifts up 200rpm. Nelson launched it at 12psi on the 9.3 and got a 1.37, so we decided to shoot for a 14-15psi release and hope for a 5.xxx 1/8mile and maybe a 9.20@148mph. Unfortunately, it broke right off the line.

So next year our plans are to put in all the required safety equipment to legally run in the 9's and 150+mph. (cage, chute, window net). both of us are going to get an NHRA license as well as updated helmet and fire suits. Plan to remove about 200-250lb from the car while still keeping it street-looking (much of the weight being light brakes, light wheels, removing the ABS, radio, AC parts...stuff like that). I really believe this car can run in the 8.9's @ 150+ if we can get it to hold together on a 1.2 second 60' time. /ubbthreads/images/graemlins/rofl.gif

Figured I would start a new thread for the video rather than tacking it onto the end of the last thread where people might miss it.
 

Tre3zy

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Joined
Nov 25, 2008
Messages
602
Location
South San Francisco, CA
/ubbthreads/images/graemlins/worthy.gif /ubbthreads/images/graemlins/worthy.gif

AWESOME DUDE!!!
 

GSX_TC

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Joined
Apr 7, 2011
Messages
3,722
Location
Houston, Texas
/ubbthreads/images/graemlins/worthy.gif /ubbthreads/images/graemlins/worthy.gif /ubbthreads/images/graemlins/worthy.gif
 

Galantvr41062

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Joined
Aug 20, 2007
Messages
410
Location
plymouth, MN
To bad the stock auto could not cut it, are you going to switch to the 2g auto like all the 1g guys running mid 8s at 160+mph? So it looks like your 10mph slower in the 1/8th and 1/4 MPH and .300 quicker at the 1/8th but only .100 quicker in the 1/4? What are your tranny fluid temps? Something is hurting you big time in the last 1/8th vs what you are gaining being auto in the first 1/8th mile. Good luck over the winter, if you want help with safety over the winter just shoot me an PM or Email and I can go over what I did.

~John
 

curtis

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Joined
May 4, 2003
Messages
11,892
Location
Clarksville TN
^ true racer right there. willing to help out the competition. /ubbthreads/images/graemlins/applause.gif


Now why is it there always some track worker always stepping in front of a camera /ubbthreads/images/graemlins/banghead.gif


Again congrats guys /ubbthreads/images/graemlins/worthy.gif
 

RedTwo

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Joined
Jul 16, 2008
Messages
1,917
Location
New Zealand
I think things are getting a little out of hand. I doubt it's comprehensive, but there seems to be the beginnings of a pattern. A VR4 arms race if you will /ubbthreads/images/graemlins/devil.gif

 

EgonOlsen

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Joined
May 4, 2010
Messages
333
Location
Denmark, Europe.
Grats, yeah it seems there is some serious competition on this atm. /ubbthreads/images/graemlins/smile.gif
 

cheekychimp

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Joined
Apr 19, 2004
Messages
7,333
Location
East Sussex, U.K.
Congratulations Nate. Even more impressive that you did this before the serious diet planned for the car. I reall sincerely wish you guys the best of luck for next year. I would love to see you hit 8s.

Paul
 

NateCrisman

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Joined
Nov 22, 2008
Messages
2,054
Location
Blairstown, NJ
Quoting GalantVR41062:
To bad the stock auto could not cut it, are you going to switch to the 2g auto like all the 1g guys running mid 8s at 160+mph? So it looks like your 10mph slower in the 1/8th and 1/4 MPH and .300 quicker at the 1/8th but only .100 quicker in the 1/4? What are your tranny fluid temps? Something is hurting you big time in the last 1/8th vs what you are gaining being auto in the first 1/8th mile. Good luck over the winter, if you want help with safety over the winter just shoot me an PM or Email and I can go over what I did.

~John



Next year we are going to start logging exhaust back pressure and trans temp, but I can't say what's up with either of those now. We have no plans to move to the 2g trans since replacements are hard to find in the junkyard and they seems to go for 3X the price. We can just keep swapping stock 1g trannies that are nearly free. We buy whole 1g auto parts cars, keep the drivetrain, and can often sell off the remainder of the car for a profit still. I think the main reason most guys were swapping to the 2g trans was the availability of the smaller diameter billet converters. Noone makes that for 1g style non-lockup anymore.

As far as the 1/8mile vs 1/4mile, I don't think it's so much a "problem" as it is just a natural advantage of a clutch car vs converter car. Your car puts 100% power down in top gear, while ours is slipping the converter. I would always expect our advantage to diminish going down the track, a manual car of close power/weight ratio should pull up on the auto car on the back half. The real comparison would be to find out how other auto guys fare at the same ET/speed to see if there is anything abnormal about the top end. I tend to think this is typical of auto cars with loose converters to have a somewhat "lackluster" top end charge. Maybe we also have a top rpm issue. still wet sump, still stock lifters, still stock oiling system in the head....maybe the sustained 8000-9000rpm in the last 400ft or so is down on power?

Our converter might even be a little looser than ideal since we are able to spool it up on the line to about 4500rpm and it flashes over 6200rpm in first gear right away. The converter is actually so loose that the last time we had the car out Nov 5th, the converter flashed up higher than the shift rpm setting! It went 9.8@143 in powerglidemode: it shifted 1-2 and 2-3 during the 60' and simply rode the converter out to the 1/8mile. IMHO, we could go tighter on the converter and it would improve the mph up top, but it's a fine line and I'd hate to make a change that hurts the 60' and 330' times in order to pick up mph and end up a wash on ET.

Edit: oh yeah, this trans had like 140k miles on it from the car we pulled it from. It's possible that it was just 2/3 worn out and that contributed to the failure. hopefully a freshly built trans will last a little longer and hold up to additional power off the line. We are going to put in a huge trans fluid cooler as well, can't hurt.
 
Last edited:

NateCrisman

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Joined
Nov 22, 2008
Messages
2,054
Location
Blairstown, NJ
Quoting curtis:
^ true racer right there. willing to help out the competition. /ubbthreads/images/graemlins/applause.gif


Now why is it there always some track worker always stepping in front of a camera /ubbthreads/images/graemlins/banghead.gif


Again congrats guys /ubbthreads/images/graemlins/worthy.gif



It took all I had in me to not swear into the camera when the track guy was pacing back and forth. Worst part is he had made me stay behind him "due to safety rules" all of 15 seconds before, so I kinda think he was screwing with me on purpose. /ubbthreads/images/graemlins/mad.gif

I think next year we will have a better video setup. We have like 4 iPhones at the track each time we go since it seems most of our crew has one (plus wives have them too). Im going to see about finding some sort of go=pro=esque suction cup mounts for iPhone that are strong. Then we can have 3-4 in car vids per run, and they are light weight compared to my heavy duty roll bar mount and a DSLR w/ fisheye.
 

NateCrisman

Well-known member
Joined
Nov 22, 2008
Messages
2,054
Location
Blairstown, NJ
Quoting RedTwo:
I think things are getting a little out of hand. I doubt it's comprehensive, but there seems to be the beginnings of a pattern. A VR4 arms race if you will /ubbthreads/images/graemlins/devil.gif





AWESOME GRAPH. /ubbthreads/images/graemlins/worthy.gif

I hope the other guys all put some time and effort in this winter to catch up and we have a great 2012 season of the record changing hands over and over. There are like 4-5 cars all within a few tenths, this could be super fun and motivating if everyone stays interested. The record doesn't really mean much when none else is trying for it.
 

JSchleim18

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Joined
Oct 16, 2006
Messages
4,801
Location
Long Island, NY
Congrats on the record Nate and Nelson!

Looking forward to 8's next year.
 

boostx

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Apr 24, 2003
Messages
4,326
Location
Orlando, FL
Awesome pass Congrats on the record..
 

NateCrisman

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Joined
Nov 22, 2008
Messages
2,054
Location
Blairstown, NJ
I'm itching to figure out what part we need to upgrade next in order to make it 60' in the 1.2's. Ideally, I want the front wheels UP! /ubbthreads/images/graemlins/rofl.gif
 

SleepinGVR4

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Joined
Feb 12, 2003
Messages
2,483
Location
Danville, Pennsylvania
Huge congrats to you Nate and GizmoVR4. /ubbthreads/images/graemlins/applause.gif

Maybe Dan S. will get his car up and running again to add to the competition.
 

Gizmovr4

Well-known member
Joined
Nov 18, 2009
Messages
366
Location
andover,NJ
Thank you for the compliments guys. Nate and I are very proud of how this car has developed seeing how it was put together only six months ago.


It’s funny how much Nate and I are alike. At Englishtown after the record pass – we could have packed it in and gone home with record in hand. However that’s not how we are – we didn’t care so much about the record- we were more concerned about squeezing one more pass and as much performance out of the car as we could.

With this said:
Nate is already trying to figure out how to get the car to launch better – weight loss- and a ton of performance improvements-. I’m looking at rebuilding the transmission using better 3rd gear clutch pack to improve the up top performance – time to stop using 125k+ mile used transmissions – that likely are slipping. I am also contemplating building another engine for racing only <img src="/ubbthreads/images/graemlins/devil.gif" alt="" />. The engine that I built this year was for street use with off the shelf cheap and used parts.

I’m sure at some point – we will also spray the car since we already have all the nitrous stuff anyway- might as well give it a shot... <img src="/ubbthreads/images/graemlins/wink.gif" alt="" />


The car is not being built for the purpose of chasing a “record” this is not what I’m about – its a fun project...If the car goes faster awesome -if not 9s are nothing to be upset about... but 8s are better <img src="/ubbthreads/images/graemlins/grin.gif" alt="" />...

Stay tuned ...
 
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Specter

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Joined
Apr 20, 2008
Messages
367
Location
Karachi, Pakistan
Quoting NateCrisman:
I'm itching to figure out what part we need to upgrade next in order to make it 60' in the 1.2's. Ideally, I want the front wheels UP! /ubbthreads/images/graemlins/rofl.gif


Would love to see that happen! /ubbthreads/images/graemlins/grin.gif
 

ApexHunter

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Joined
Apr 25, 2007
Messages
1,992
Location
Marysville, WA
Quoting NateCrisman:
Quoting RedTwo:
I think things are getting a little out of hand. I doubt it's comprehensive, but there seems to be the beginnings of a pattern. A VR4 arms race if you will /ubbthreads/images/graemlins/devil.gif





AWESOME GRAPH. /ubbthreads/images/graemlins/worthy.gif

I hope the other guys all put some time and effort in this winter to catch up and we have a great 2012 season of the record changing hands over and over. There are like 4-5 cars all within a few tenths, this could be super fun and motivating if everyone stays interested. The record doesn't really mean much when none else is trying for it.



Drag racing is not so much my thing, but this is getting interesting. I can totally appreciate all the work that you guys are putting in here. I like these cars and from that standpoint there is some really neat stuff happening with the contenders.

Great work guys, congrats.
 
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