Pro Stock John

iTrader: (34)

I had a few questions, we always talk about dyno numbers and rarely get to look at the difference in parasitic losses M6 vs A4.

Well, Weatherguy has a MTI 422 (R1, LS1 heads) and with an M6 dynoed what, 480rwhp?

Now with his new 200R4 he dynoed what, 46_rwhp I think? I'm just curious.

I'm also curious if he locked up the 200R4 or is running a non-lockup converter in it. I know he just went 11.1@123mph at HRP.

My last dyno was 451rwhp/ 531rwtq unlocked thru 9"/ locker/ 4.11's.

I also saw Shane post that his 9" swap ate up 20rwhp is that right anyone have the number?

Next time I dyno I am going to dyno on radials (all my past dynos are on slicks) and I will lock the converter.

Thanks in advance to the guys I named in the post, I am just looking for comparative data.

<small>[ October 04, 2002, 06:42 PM: Message edited by: Pro Stock John ]</small>

steve

the question must be raised to john.
why rely on dyno numbers?
they are a great tuning tool yes but its not the end all for running a good quarter mile.

use the dyno for tuning, but keep in mind that you are going to have to at some time get the car to a track and get some serios track time and get the car running right.

i was running 11.90-12.0 all day long with a measly 315 dyno hp.. it does not make sense, but thats what it was running back then...

steve frank

steve

i also have not read the other thread about your issues either john.
i do seem to remember some thing about your car running lean up top?

is this car equiped with a stock fuel system?
how lean is it? d you have a fuel pressure gauge installed? whats the drop and at what rpm ect is it occurring?

steve frank

WMSuperSport

iTrader: (23)

I seriously doubt hes using stock anything...

WeatherGuy

Hey John, just saw this.

My car dynoed 495 RWHP (best of several, but all about 492-495) 489 RWTQ with the M6. With the 200-4R, it dynoed 469 RWHP with the converter unlocked and a much heavier driveshaft. I figure taking a 2% converter loss (about 10 hp), and 2hp for the driveshaft, I get about 481 RWHP through the tranny. So I am guessing about a 14 HP parasitic loss due to the auto. Not bad, when you think about it.

Watch out on my track time, though - the converter I have, a PY3400E modified for a 422, is awful for all motor passes. It is tight enough to move the car forward or backward immediately on shifting into D or R, and I do not think I was even getting the thing to flash to 3100 on my all motor passes. There is an easy 0.2 to 0.3 lost here for all motor passes. All the same, I should still squeak into the tens all motor either waiting for better weather and/or getting another 100 lbs off of the car.

On the giggle gas, that converter is a different story . . . <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

Nine Ball

iTrader: (38)

Hey John, I'm sorry bro, but your engine isn't making 531 ft-lbs. That figure is skewed because you are not locking the converter, which screws with the rpm data. When you finally get around to locking the converter on the dyno, you will probably find around 470ish ft-lbs at your power level. With stage 3 LS6 heads and an S1 cam, you don't necessarily have a "torque monster" type setup on a 422ci engine. That cam is more suited to higher rpm power making.

For example, my engine pulled 525 rwhp and 516 ft-lbs, and I have a larger displacement and more rwhp. That is with a comparible set of heads and the same cam specs.

-Tony

Brian99Z28

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Nine Ball:
<strong>For example, my engine pulled 525 rwhp and 516 ft-lbs</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif"><img border="0" alt="[hail]" title="" src="graemlins/gr_hail.gif" />

Skelton

John, if I had you car I would run 4.56 gears with 28's and spin it 6700 or so through the traps.You can swap carriers in a 9 inch in an hour. I would also have my shift points about 3-400 rpms over peak hp. You need to turn more rpm's and I also would try a looser converter. Your not that far off. I know this is just an oppinion but your heads may be costing you some hp also.I just dont think you have as many gremlins as you might think. Next week will have great weather for drag racing <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

Pro Stock John

iTrader: (34)

Thanks for the responses. I just find W'guy's comparison #'s very interesting.

Y2kBlackbird, we are gonna most likely dyno again, I made peak at 5500 unlocked and before I used to make peak at 6100 so perhaps an issue with my injectors or even the MAF. My S1 cam is 242/242//112//108 intake centerline so it's a tq monster down low.

I'd like to run more stall I can handle another 400 rpms this old col verter still only feels like a 4000.

Louis

iTrader: (7)

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Y2K Blackbird:
<strong>You can swap carriers in a 9 inch in an hour. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Yea, what he said! Dont make me come up there at 41 and swap centersections for ya <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

Pro Stock John

iTrader: (34)

I've swapped out the center section a few times it's not hard, it just weighs a ton if you are doing on a lift.

CHRISPY

4.56s with the 28s sound like a great idea.
That with the shift point changes to 6700-6800rpm and redynoing with the correct gear entered into the dyno software with the tranny locked will help a lot I bet.

I think your numbers are skewed from the rpm/mph factor being so far off.
Also throw on a stock descreened MAF for an experiment and turn off COT in your program if it isnt already.
Cheers,
Chris

Superman

Parasitic losses.. I think some anti-biotics should clear that right up John.

Pro Stock John

iTrader: (34)

I had a long talk with Wade at ARE this morning, I am going to redo the AF and dyno again and use the AF ratio they use up at ARE for our setups.