4.2L Dyno numbers inside. V8 guys, come and see... (Big pic) - TCCoA Forums
 
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post #1 of 25 (permalink) Old 12-21-2002, 07:08 PM Thread Starter
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4.2L Dyno numbers inside. V8 guys, come and see... (Big pic)

Well, I just got back from a Lightning club dyno day and I got some runs in...



Needless to say, I am VERY happy and excited. Unfortunately, last night I changed my plugs and found that my #4 cylinder plug was fouled with oil... I think there is something amiss there, and I will need to rebuild to fix it. The engine runs fine besides that.

Next, I will need to go to the track and run those mid 15s!!!!

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post #2 of 25 (permalink) Old 12-21-2002, 08:14 PM
 
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Hey PJ. Congrats. Nice graph there. Seems the swap was well worth it.

Question: What is it like under 3800 rpm?
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post #3 of 25 (permalink) Old 12-21-2002, 11:15 PM Thread Starter
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To answer your question honestly, I don't know. Since I could not get the torque converter locked-up, I let the dyno guys do it their way... Basically, they rolled into second, then pegged it, shifted into 3rd (D) at redline, and started the pull. The graph only shows what goes on after the 2-3 shift... The torque converter should be locked-up at that point, so it's the only part of the graph that would be accurate had I been provided with readouts for lower RPMs.

The other down-side to this is that I didn't get to play with my IMRCs at all. Actually, I now have my doubts regarding the way they operate... I have a feeling they are opening even though my vacuum solenoid is closed... I think it doesn't provide a tight-enough seal to prevent vacuum from reaching the actuators... I will experiment later to see what's going on.

Never the less, I am really happy with my numbers.

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post #4 of 25 (permalink) Old 12-21-2002, 11:39 PM
 
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Yeah, the results are Grrrreeaaat! I see a 4.2 in my future. My 3.8 just has to die first.
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post #5 of 25 (permalink) Old 12-22-2002, 08:49 AM
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DAMN you
You have 21hp and 22rwtq on me............. with a PI stall converter you would be into the high 14's with traction, I say you have an easy 15.5 right now. Fastest NA, not yet. We had a guy that came around once in a blue moon with a Supersix stage 3 everything and a Stall converter and he posted a 14.98 with his car, but with a converter I think you have that beat.
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post #6 of 25 (permalink) Old 12-22-2002, 09:59 AM Thread Starter
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Before I get a stall converter, I think I need to replace my differential and track-lock. As it is, without a stall converter, I can light-up (one) tire from a stop-- no power breaking. So, the diff goes in first... Then I guess I will go to the track.

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post #7 of 25 (permalink) Old 12-22-2002, 11:37 AM
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thats basically a stock motor right? p/p heads and perhaps a custom sheetmetal upper intake soon? i dont see that truck intake making as much power as you could with a shorter runner intake...

and why doesnt the mustang intake work? i only looks like the egr would interfere with the distributor...you dont need that....

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post #8 of 25 (permalink) Old 12-22-2002, 02:50 PM Thread Starter
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I don't need what, the distributor? The engine is stock... the only differences is a custom cold-air intake setup, 80mm LMAF, and the distributor ignition instead of the DIS setup. The Mustang intake won't clear the distributor, and my EGR is already gone. I like truck intake because of these clearance issue and because I've heard that the longer runners will be more beneficial under boosted applications.

This guy I met at the meet is trying to convince me to go single-turbo and use make a sheetmetal intake. He also thinks that if I use a large enough postive displacement blower, that I could have good boost up top without worrying about low-rpm damage.

There are a lot of things to think about.

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post #9 of 25 (permalink) Old 12-22-2002, 03:10 PM
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no you dont the egr...lol...of course you need the distributor...i dont know about the 99+ mustang intake...i guess i just gotta look at in person

and very nice numbers for a basically stock 3.8 motor...thats probably even with if not more than a stock 5.0 HO motor
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post #10 of 25 (permalink) Old 12-22-2002, 03:43 PM
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PJ, I see low 15s to high 14s in that dyno.




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post #11 of 25 (permalink) Old 12-22-2002, 09:26 PM
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Does that 4.2 rev high enough to effectively use a turbo?

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post #12 of 25 (permalink) Old 12-23-2002, 11:13 AM Thread Starter
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I don't see why not. Turbo diesels have low redlines, don't they?

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post #13 of 25 (permalink) Old 12-23-2002, 12:08 PM
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Yeah, but how much power does one actually get from a turbo diesel?

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post #14 of 25 (permalink) Old 12-23-2002, 01:43 PM
 
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Good numbers.....You've still got the gears and Alum rear to install also???
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post #15 of 25 (permalink) Old 12-23-2002, 02:18 PM
 
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Quote:
Originally posted by Alex
Yeah, but how much power does one actually get from a turbo diesel?
enough to move some pretty big trucks. its all in how you size the turbo or blower.

impressive number PJ
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post #16 of 25 (permalink) Old 12-23-2002, 03:05 PM Thread Starter
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What's up, Scoupe? Yeah, the gears are not in yet, but I think I am gonna sell that aluminum diff with the 4.10 gears and buy a built motorsport 3.73 diff. Rancher feels like the smarter side of my v6 performance world, and 4.10s plus the torque of forced induction just seems like overkill.

Thanks, J-Rob.

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post #17 of 25 (permalink) Old 12-23-2002, 04:29 PM
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is that a 4:10 tlok aluminum rear? how much would you sell it for?
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post #18 of 25 (permalink) Old 12-23-2002, 04:56 PM Thread Starter
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PM me.

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post #19 of 25 (permalink) Old 01-03-2003, 11:43 AM
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The distributor will not clear the 99+ Mustang intake, trust me I just finished that swap. Here's the thread: http://forums.tccoa.com/showthread.p...threadid=10412

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post #20 of 25 (permalink) Old 01-04-2003, 03:23 AM
 
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Nice numbers PJ



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post #21 of 25 (permalink) Old 01-04-2003, 03:15 PM
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PJ,
Good work man. A longer runner intake will provide more torque but will shorten your power curve.

This is not a big deal on a longer stroke motor like a 4.2 that makes its power lower in the band, but it could hurt a 3.8.

Apparently in boosted apps. it is not as noticeable a loss anyway so if that is your future plan, don't sweat it.

Alex,
Are you for real man? Have you not seen the new Ford Super diesel? 300 HP and 600 TQ. The Banks modified Cummins makes 400 hp and 800 TQ.
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post #22 of 25 (permalink) Old 01-04-2003, 03:40 PM
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I'm talking about tiny diesel engines, not those mammoth engines that spit like 500000cfm of exhaust.

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post #23 of 25 (permalink) Old 01-04-2003, 04:20 PM
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Define a tiny diesel?
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post #24 of 25 (permalink) Old 01-04-2003, 04:30 PM
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There is NOT an engine you can't turbo charge. 3.8L works GREAT for a turbo engine, Ever hear of a Buick Grand National? Same bore and Stroke as out 3.8L. I also Work on Turbo Diesel engines EVERY day in my job, from 1.2L 3 cyl to 4210CID V16's and ALL work great with turbos. The SIZE of the turbo is EVERYTHING. I wouldn't take much work to find a Single turbo to would hit Full boost by 2500rpm and make power all the way to 6000rpm on a 4.2L
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post #25 of 25 (permalink) Old 01-04-2003, 08:57 PM
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Thanks for the info rancher. I'm just going by a thread that was here a couple months back about someone twin turboing a 3.8 and they had really crappy numbers. Then someone said that you can't turbo some engines that don't have enough backpressure blablabla i dunno. I know more about supercharging than turboing.

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