Dynamometer Results & Comparisons - Locked vs unlocked dyno 418ci LSX

We just dynoed 418ci LSX (1/4 Setup) high comp / Vic / PRC 237 heads/ big hyd cam.

Now for the power robbing drivetrain
TH400 / 4000Stall / 3.5 Steel driveshaft / 9'inch 3.73 gears / M&H 275-60-15

The car made 459rwhp 385rwtq N/A Unlocked peak power 6700rpm
we made the best power on 32degrees of timing C16 Fuel

on 200shot Nitrous outlet direct port with mid/low 10s A/F ratio made 655rwhp 540rwtq unlocked 19degrees of timing C16 Fuel in the standalone.

What do you think it will make with locked converter?? N/A & nitrous?

We're looking for mid 10s N/A and 8.99 on 300shot.

We tested the car on the street N/A with nitrous tune the car ran good .

Ignoe the hahahah in the end of the video the owner didnt drive the car in 2years. :lol:

http://www.youtube.com/watch?v=p86DUuHvt50



I'll try to post some dyno graphs.

Thanks,
Sam.

Nice car bro .. with this type of drivetrain the dyno numbers don't count .. sounds sick :D

LS3/L92 Block or LSX Iron Block ?

HAHAHAHAHAHA << looooooooooooooooooooooooooooooooooooooooooooooooo oooool

I'll be laughing like that soon too. Can't wait it's been almost 2 years for me too lol. That car looked like it was reaching for the sky!

Nice car bro .. with this type of drivetrain the dyno numbers don't count .. sounds sick :D

LS3/L92 Block or LSX Iron Block ?

HAHAHAHAHAHA << looooooooooooooooooooooooooooooooooooooooooooooooo oooool


Thanks bro.
The car sounds sick for sure and drives great too..
I'm talking to the owner for Bahrain trip :D

LSX Block.



I'll be laughing like that soon too. Can't wait it's been almost 2 years for me too lol. That car looked like it was reaching for the sky!



Thanks and good luck with yours and yes it lift the front end very quick.



Come on guys any more info about the locked vs unlocked diffrence??

just depends on how much slip your getting unlocked...

i believe my converter has 8.5% slip, and it gained 36rwhp locked

Based off my 4000 stall i would say between 485-505 rwhp with a locked converter. Sounds like a killer set-up.

My 11.14cr 418 (4.083 bore LS3 block with 4" stroke), AFR 225's, 245/260 .646/.629 106/109 cam, 1 3/4 stepped to 1 7/8 headers made 469rwhp unlocked through a 4L80E and 521rwhp locked. This was through a 12 bolt, 4.56's and a 315/60/15 drag radial.

Who gives a fuck what it makes on the dyno. I wouldn't lock the converter and stress it like that.

Just take it to the track.

.02

Greg,

Why would you not want to lock a converter? I can understand not locking a 4L60E, but my bone stock 4L80E had no problems being locked on the dyno, nor at the track. It also consistantly went .15-.17 faster with an additional 3-4mph. That was in my truck with the old 347ci motor.

I wouldn't worry about the numbers near as much as I would worry about how rich it is on the nitrous. Your going to have another period of downtime running it that rich, especially on nitrous.

Greg,

Why would you not want to lock a converter? I can understand not locking a 4L60E, but my bone stock 4L80E had no problems being locked on the dyno, nor at the track. It also consistantly went .15-.17 faster with an additional 3-4mph. That was in my truck with the old 347ci motor.

If you picked up by locking the stall you probably had too much stall, or it was very inefficient...

Unless its a turbo app, then you can see an increase in ET / Trap due to the increased load on the turbo(s) making more boost down track, and if the converter can handle it, then go for it.

If you picked up by locking the stall you probably had too much stall, or it was very inefficient...

Unless its a turbo app, then you can see an increase in ET / Trap due to the increased load on the turbo(s) making more boost down track, and if the converter can handle it, then go for it.

That is so true.

9/10 when you lock a stall at the top of 3rd gear down track the car will need more power thrown at it to keep the converter from pulling the motor out of it's RPM band that it's making peak power at.

When the pro mod's that use ATI or Hughes lock up powerglide converters lock the converter they either throw more boost at it, or have a final small "kit" or "stage" of nitrous they use to keep the motor in it's optimal rpm range.

With a "street" motor that rpm window/band will be wider, but still any time you pull a motor out of it's happy place and pick up that much, it's because it's slipping the piss out of the converter before it became locked.

You've been busy buddy! Can you post the graphs and some underhood pics?

I've been thinking of putting a Vic on my car.

My 11.14cr 418 (4.083 bore LS3 block with 4" stroke), AFR 225's, 245/260 .646/.629 106/109 cam, 1 3/4 stepped to 1 7/8 headers made 469rwhp unlocked through a 4L80E and 521rwhp locked. This was through a 12 bolt, 4.56's and a 315/60/15 drag radial.


Thanks alot for the info man..
Do you think unlock numbers on stalled TH400 will be even worse??


Who gives a fuck what it makes on the dyno. I wouldn't lock the converter and stress it like that.

Just take it to the track.

.02


I totally agree with you.
the nearest 1/4 to us is 400miles away we want to make sure everything is working perfectly before making the track visit.



I wouldn't worry about the numbers near as much as I would worry about how rich it is on the nitrous. Your going to have another period of downtime running it that rich, especially on nitrous.


That's why we stoped the dyno :)
We already changed the fuel jets and we're going back to the dyno next week for better results hoping for 750rwhp with unlocked converter.


You've been busy buddy! Can you post the graphs and some underhood pics?

I've been thinking of putting a Vic on my car.


Hey Arun I will get the graph and pics tomorrow. :D

We just finished another big setup TT 454ci LSX C6ZO6 955rwhp 943rwtq on 91octane :hail: 20+psi next time

Good deal lean that baby out! Lean is mean! Just keep the timing nice and low! Nitrous contrary to belief will like low timing and lean air fuel ratio 9/10. Just make sure you have the proper heat range plug when you go leaning it out, are they/you/owner reading plugs?

When you say high compression, how high are we talking?

Good deal lean that baby out! Lean is mean! Just keep the timing nice and low! Nitrous contrary to belief will like low timing and lean air fuel ratio 9/10. Just make sure you have the proper heat range plug when you go leaning it out, are they/you/owner reading plugs?


Thanks for the help man.

We're running TR8 plugs and yes we're reading the plugs I'll try to post some pics of them..


When you say high compression, how high are we talking?


13:1 comp built for nitrous.

Personally with that big of a shot, 13:1 compression I'd be running a -9 plug at least.

If your reading plugs and know what to look for at that size shot and compression you should be seeing a good bit of heat on the strap.

It could be since it's so rich right now your not seeing that heat, but if you were to lean it out to where it should be (IMO on nitrous on a spot on tune should be no richer than 11.7-11.8 and really should be somewhere around 12.0-12.5) you will see that heat quickly.

Put a -9 plug in it next time it's sprayed and don't use an projected tip plug like a TR8 for nitrous! I'm surprised it hasn't eaten the straps off the plugs, again it could be due to it being rich. Put some -9 non projected tip plugs in it for sure.