SB2 LT1 - Chassis Dyno #'s

For those who have not been following, the motor is a 396" LT1 with Nextel Cup SB2.2 heads and intake, DFI GEN 7 and a NX direct port system.

After some bearing issues it finally made the smoke we were looking for.

All numbers through a GForce T56 and a 12 bolt:

626 RWHP on motor
853 RWHP on a 200 shot

The nitrous run was very conservative and has more tuning in it as it is a touch on the fat side.

Off to the track next week :)

Awesome numbers!! How do you think the 12 bolt will hold up at the track?

If that car hooks, that 12-bolt will file a formal complaint.

Good luck!

Just nasty :)

If that car hooks, that 12-bolt will file a formal complaint.

Good luck!

Aren't there lots of other guys running 9s or better with 12 bolts? I thought the only weakness to the 12 bolt was the Eaton Posi most of them come with. Those numers are SICK. I wish I had the funds to do a 427 SBC with those heads along with high compression and a massive solid roller.

Very nice... Been watching your setup for awhile now :-D

Aren't there lots of other guys running 9s or better with 12 bolts? I thought the only weakness to the 12 bolt was the Eaton Posi most of them come with. Those numers are SICK. I wish I had the funds to do a 427 SBC with those heads along with high compression and a massive solid roller.

I actually saw one for sale not too long ago. I believe it was a 434. I can look for it, I think the guy only wanted 11k or so.

We ditched the Eaton and put in a locker.

Going with a bigger bore with these heads would really wake them up. We did it with 4.030" bore and a small plenum restrictor plate intake and didn't port the heads. It might be closer to 700 rwhp N/A with the right setup.

Thanks for all the kind words.

:thumb: :burnout:

very cool indeed. :)

626 RWHP on motor
853 RWHP on a 200 shot

Off to the track next week :)

Congrats Dave.
Those are GREAT numbers ;)

Good luck at the track, keep us posted

---Bill.

Nice numbers! At what rpm are you getting those hp and tq numbers?

Awesome #'s! Looking forward to seeing your track results.

Nice numbers! At what rpm are you getting those hp and tq numbers?

7500 N/A
7000 Nitrous

Man, that's some monster torque! Looks like a really nice motor design all the way through. It's gonna fly!
Chris

Awesome Dave! :bow: It's about damn time! :)


Chrism400, where did you see torque numbers?

Chrism400, where did you see torque numbers?

Well, at 7500 rpm, he's making 438 lbft of torque. His peak torque is probably in the neighborhood of 6200 and close to 500 I'm guessing. Maybe he will chime in again.

Dave, What was your fix for the cooling issues you were having? Thanks, Rob

Verrrrry cool! :cool:

Awesome. Any chance we'll see a dyno chart? I'm interested in how "peaky" the package is to obtain such crazy N/A numbers. Do you get a decent range to shift in without "bogging" (relatively speaking of course... I doubt the "down" parts of the curve are still pretty nasty :)).

I assume the curve is way better (flatter) than a similar hp turbo set up. Just wondering if you've looked at the comparison between this and a moderate blower or turbo LT1 of the similar hp numbers... think it's more "driveable" (in a road racing sense of course, I doubt this is a daily driver :)).

That is sweet! That is some SERIOUS sh!t right there.....just exactly HOW do you plan on keeping that much power planted on a road course? I spun out in a stock Chevy Cobalt(well I almost did he he). WIth that much power you should be able to scare a damn Rolex sports car down the straight away. LOL:cool:



David

That is sweet! That is some SERIOUS sh!t right there.....just exactly HOW do you plan on keeping that much power planted on a road course? I spun out in a stock Chevy Cobalt(well I almost did he he). WIth that much power you should be able to scare a damn Rolex sports car down the straight away. LOL:cool:



David

If I'm not mistaken he has some 17x13 inch wheels on the car, though they might be 17x11. Either way, it's a lot of rubber.:D

Here's the drag setup...

http://memimage.cardomain.net/member_images/3/web/375000-375999/375580_151_full.jpg

http://memimage.cardomain.net/member_images/3/web/375000-375999/375580_153_full.jpg

http://memimage.cardomain.net/member_images/3/web/375000-375999/375580_152_full.jpg

http://memimage.cardomain.net/member_images/3/web/375000-375999/375580_154_full.jpg

http://memimage.cardomain.net/member_images/3/web/375000-375999/375580_156_full.jpg

http://memimage.cardomain.net/member_images/3/web/375000-375999/375580_157_full.jpg

Van: Billet mechanical belt driven Mezerie wp

Steve: See chart. It's based on mph not rpm but we started the pull at 3000 and went to 7000 so that should give you an idea. No torque numbers on this sheet but I can tell you the curve is real flat from 3500 to 6500. BTW the dip in the N/A run is do to the DFI pulling 12* of timing. It was supposed to be a nitrous run but the FJO did not engage due to a wiring issue.

FastFatboy and Jerminator96: Jerm is correct, 17x12's with 335 Khumo road race rubber rear, 17x10 with 315 Khumos front. You still have to be real "gentle" with the throttle. It weighs about what a Nextel Cup car does with about 50-75 less hp. It does have the ability to fit way bigger rubber though so road course should be fun.

the car gives new meaning to "shock and awe"




P.S. I like the nitrous system

Dave,
This car looks Awesome... Your hard work shows...
Shoot us some pics for our customer section.
http://www.nitrousoutlet.com/customerCars/index.asp

Dave

Thanks. Will do. Most of the nitrous stuff came from you guys.

I remember when you posted up the engine dyno numbers a while back and was lookign forward to hearing how this project was coming along. I didn't know you were throwing juice at it, too! Love the choice of heads- don't recall seeing many of them out there, that's for sure.

Thanks. Will do. Most of the nitrous stuff came from you guys.

Sweet. Thank you for letting us be a part of your build.
Dave

Well, how did it run?

Whoe hoe hoooo! I'm working my ass off trying to set up a business so I've been away for a bit, but followed this for quite a while.

Al I have to say: Killer Dude!! Lay some whoop ass on em! Very happy to folow your progress. Some one has to break a few eggs.

Steve: See chart. It's based on mph not rpm but we started the pull at 3000 and went to 7000 so that should give you an idea. No torque numbers on this sheet but I can tell you the curve is real flat from 3500 to 6500. BTW the dip in the N/A run is do to the DFI pulling 12* of timing. It was supposed to be a nitrous run but the FJO did not engage due to a wiring issue.

FastFatboy and Jerminator96: Jerm is correct, 17x12's with 335 Khumo road race rubber rear, 17x10 with 315 Khumos front. You still have to be real "gentle" with the throttle. It weighs about what a Nextel Cup car does with about 50-75 less hp. It does have the ability to fit way bigger rubber though so road course should be fun.[/QUOTE]

Sorry to take so long getting back here...

It runs great except it won't shift. It has been 11.00 @ 126 with it hanging up in every gear on motor. Haven't hit the button yet. It's 60' in the 1.50's with both front wheels about 3" off the ground. So we got rid of the G-Force T-56 for this semi-clutchless G-force GF5R...

http://memimage.cardomain.net/member_images/3/web/375000-375999/375580_158_full.jpg

http://memimage.cardomain.net/member_images/3/web/375000-375999/375580_159_full.jpg

http://memimage.cardomain.net/member_images/3/web/375000-375999/375580_160_full.jpg

This should put us in the 10.50 range at around 130 on motor then we can start nitrous tuning.

So much for the fastest T56 record. Oh well...we can still be the fastest stick shift LT1 maybe.

Very good numbers.
It does take a while don't it?

LMFAO that tag frame is the sh!t!!!


David

Damn, Dave.. What happened? The T-56 can take ALOT of punishment... was it not disengaging in every gear or something? What clutch were you running? What master/slave? What T-56 build?

Mike

how big of a cowl is that? your car scares me, im gonna have nightmares tonight

LMFAO that tag frame is the sh!t!!!


David

Believe it or not, Dave's Dad bought that frame. It's pretty funny to see it on such an beautiful car.

Damn, Dave.. What happened? The T-56 can take ALOT of punishment... was it not disengaging in every gear or something? What clutch were you running? What master/slave? What T-56 build?

Mike

Be prepared to read a book when he replies.

this semi-clutchless G-force GF5R...
http://memimage.cardomain.net/member_images/3/web/375000-375999/375580_158_full.jpg


http://i12.photobucket.com/albums/a224/sc68z28/4307003.jpg

You are going to love that trans :D
I've been beating on mine for about 3 years now, 1500 miles, 60 drag strip passes, and my third set of rear gears. Other than a slow leak between the case halfs at the tail housing, mine has worked great.
Your V-gate appears to be mounted about 3" back? I'm looking at the shifter mounting plate on mine. I have to remove the shifter (also a V-gate) when I remove or install the trans, and I know, you should not do that;).
What gear ratios did you choose, and your rear gear? I went with 3.25, 2.22, 1.65, 1.29, 1:1, with a 3.50:1 rear.
What kind of clutch are you going to use?
---Bill.

Looks good! When are you planing on getting back to the track with the new trasmission?

O.K....

The T56 was great except that it wouldn't shift at 7800. Using a street twin with mebic disc linings. Problem was the synchros weren't keeping up and the 45lb clutch wasn't helping.

Cowl is 4"

Our Vgate is set way back to clear the trans tunnel on the 4th gen to keep the shifter location where I need it to be. Without looking I think our ratios are 3.15. 2.52, 1.90, 1.50 and 1.1 with a 4.30 gear. Gotta take my shifter off as well. Using a McLeod SoftLok. Glad to hear you are having a good experience with it. Nice ride BTW.

Drove it on the street. One word...VIOLENT :D

Geez Dave! That thing has got to be absolutely wicked on the street. I couldn't even imagine...Wow! Hey, I wanted to ask you how much you think the bore size is affecting the valve shrouding. In your opinion, is it less significant than people say?
I can't wait to see what this monster does in the quarter. It's definitely a max effort project and one to keep tabs on for sure. LT1's back on the map!:)

Bore size means a lot. Our flow numbers were down by 30cfm when going from a 4.125" to a 4.030" bore on the flow bench.

I've been running a Softlock on the street behind a T56 for about 3 years now. It's really not that bad once you get used to it. It doesn't chatter, just a little sintered Iron squeak during engagement. I can tell you this, when the clutch starts to go south, it goes quick, and no amount of added preload will bring it back. Figure on a rebuild every season or 2 maybe if you don't race often.

Were you trying to shift the T56 under full throttle? They don't really like that action too much, especially a 2-3 shift. I was only sucessful 70% of the time, so I had to revert back to a more ah' ah' pussified shift technique.

Steve

Actually I was lifting to shift. It simply did not like the RPM's. No matter what I did, It' wouldn't shift. Glad to hear you are having good luck with the softlok. I've heard they go quick when they start. We bought an extra disk right away.

For your Soft-locks, when they need reworking or replacing, give Rob Youngblood a call.
http://www.advancedclutches.com/
He can do wonderful things with them, customized to your car.
I had him build me one of his 7", two disc, sintered iron, adjustables.
With the flywheel inc, total weight is only 19 lbs.:eek:
He tunes them to your cars weight, torque, HP, launch and shift RPM.
He is a one man operation, so when you call with a question, you get the guy that did your clutch.

Mine has only got 200 miles and 8 passes, but it has worked perfectly so far :)

---Bill.

Thanks Bill. That's handy to know.

Yeah Bill, great info. I need to call him at some point. Thanks.