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View Full Version : New mod?



TurboYT
03-16-2005, 09:18 AM
I would love for my truck to sound like this - Lowered Compression (http://www.dps-performance.com/media/sounds/DIESEL.wav). Have either of you guys considered lowering your compression by opening up your pre-chambers? Then we can run more boost!!!

SoCalDavis
03-16-2005, 11:06 AM
hmm....sounds ok towards the end...but I think I would pass!

mike100
03-16-2005, 11:08 AM
you do of course realize that we are in the IDI forum... I wouldn't lower compression on a PSD because they are hard to start, but the 20:1 IDI is a different story for using a turbo.

TurboYT
03-16-2005, 11:20 AM
Thank you for the backup on that one Mike. A little harder to start but damn does it sound mean once it get's going. Sounds like a 454 with some serious lope in the cam.

PITBULL62
03-16-2005, 09:18 PM
dam that took foe ever to start!

mike100
03-16-2005, 10:22 PM
Ok, now that I'm home and have speakers on my computer...OMG! that thing barely runs. I recently saw a video of a restored german tiger tank on a demo run and it started easier than that. well, ok..it had bad carbs..but it was close to being as good as that diesel.


I can imagine big white puffs of diesel coming out the tailpipe. kind of sounds like the mining truck 50liter 16v detroit 4000 mtu series starting when it's 10 degrees outside.

How low did they take the compression ratio? 15:1 ?

weweld
03-16-2005, 10:31 PM
They usually take about .010 off the top , some times as much as .020

http://www.socaps.comimages/graemlins/chef.gifGENE http://www.socaps.comimages/graemlins/burnout.gif http://www.socaps.comimages/graemlins/usa.gif http://www.socaps.comimages/graemlins/yay.gif http://www.socaps.comimages/graemlins/hungry.gif http://www.socaps.comimages/graemlins/yay.gif http://www.socaps.comimages/graemlins/flatware.gif http://www.socaps.comimages/graemlins/yay.gif

SoCalDavis
03-17-2005, 08:40 AM
kind of sounds like the mining truck 50liter 16v detroit 4000 mtu series starting when it's 10 degrees outside.



thats what I was thinkin'! http://www.socaps.comimages/graemlins/wink.gif

PITBULL62
03-17-2005, 09:06 AM
20:1?

TurboYT
03-17-2005, 06:05 PM
Gene,

Where do they take it from? My understanding is that they "increase" the opening of the pre-chamber? I actually have not had the pleasure of looking at that side of my heads. If you have seen it, know anything about it, or know anyone who has info on it, well send'm my way.

mike100
03-17-2005, 09:14 PM
20:1




Those are the odds that anybody will ever see what SoCalDavis looks like in person.

weweld
03-17-2005, 11:06 PM
They are shaved off the top , you don't want to change the chamber that much.

http://www.socaps.comimages/graemlins/chef.gifGENE http://www.socaps.comimages/graemlins/burnout.gif http://www.socaps.comimages/graemlins/usa.gif http://www.socaps.comimages/graemlins/yay.gif http://www.socaps.comimages/graemlins/hungry.gif http://www.socaps.comimages/graemlins/yay.gif http://www.socaps.comimages/graemlins/flatware.gif http://www.socaps.comimages/graemlins/yay.gif

SoCalDavis
03-18-2005, 07:36 AM
20:1




Those are the odds that anybody will ever see what SoCalDavis looks like in person.



hehehehe.....I'm so flattered that I'm on so many peoples minds http://www.socaps.comimages/graemlins/wink.gif http://www.socaps.comimages/graemlins/wink.gif http://www.socaps.comimages/graemlins/wink.gif http://www.socaps.comimages/graemlins/wink.gif

lol

TurboYT
03-18-2005, 09:52 AM
Gene,

The shortened frame trucks. Are you starting off with a standard cab/long bed? Then pulling the bed, shortning the frame and then replacing the old bed with a short bed?

I assume you have to cut the frame before the back axles?

weweld
03-18-2005, 07:06 PM
YES and YES and YES

Now I sound like a YES man http://www.socaps.comimages/graemlins/lol.gif http://www.socaps.comimages/graemlins/lol.gif http://www.socaps.comimages/graemlins/lol.gif http://www.socaps.comimages/graemlins/lol.gif http://www.socaps.comimages/graemlins/lol.gif http://www.socaps.comimages/graemlins/lol.gif

http://www.socaps.comimages/graemlins/chef.gifGENE http://www.socaps.comimages/graemlins/burnout.gif http://www.socaps.comimages/graemlins/usa.gif http://www.socaps.comimages/graemlins/yay.gif http://www.socaps.comimages/graemlins/hungry.gif http://www.socaps.comimages/graemlins/yay.gif http://www.socaps.comimages/graemlins/flatware.gif http://www.socaps.comimages/graemlins/yay.gif

beretzs
03-20-2005, 04:38 PM
That is Kens pulling truck, I think when he last dynoed it he was right around 600HP and some insane amount of torque. I believe the truck is also on the original starter and everything. It is supposed to be a pretty bad truck. It is not a daily driver and he will tell you that. I think the whole time he was cranking it, someone was giving it some ether. It was also a 50* day. Anyhow, just thought I would give you some background on the truck. It is an oldie, but a real monster for pulling. Scotty

TurboYT
03-21-2005, 08:37 AM
Scotty,

It was a good time. It's always nice to finde fellow diesel nuts. Only 4 of us showed but a good time. Of course talked about possible improvements.

So you is yours running? What was the verdict on the oil leak?

600 hp is that at the tires or flywheel? Could we do a mild prechamber smooth out?

beretzs
03-21-2005, 09:30 AM
Right now, the truck still runs and drives fine, but I have not been driving it, since I would rather not aggravate the problem. I belive they are lowering the compression by using shorter pistons and smoothing out the pre chambers, and I belive they are getting the power at the rear wheels. I am hesitant to do too much lowering of the compression, since I really would not want to sacrifice my cold starting. You can pull alot of power with stuff like modded IP's and Injectors, intercoolers, propane and stuff like that, before you start modding the actual engine. Scotty

TurboYT
03-21-2005, 10:04 AM
I know I know I know, but it just sounds sooooooooooo good!!!! Speaking of propane, how is yours running? PM me with Ken's info. Getting very serious about new IP and injectors. What kinda of fuel economy (or lack of) are you getting with your new pump? How hot is your new pump (mild or wild)?

beretzs
03-23-2005, 10:58 AM
Hey, just give Ken a call and talk with him about the IP and Injectors, I think my pump is somehwere in between the mild and wild, just a massaged turbo IP. http://www.dps-performance.com/ The propane is awesome, I love it, wished I could drive the truck right now, but as soon as the truck is back up and running I am going to hook up the Jeep and just go somewhere. Fuel Economy has gotten better with the new IP and Propane, but that is probably due to the efficiency of the propane and the new IP. I don't think the IP uses more fuel, it can, but if you are driving normal, your fuel mileage should not change. Scotty

beretzs
04-25-2005, 09:20 PM
What kind of IP and Injectors is Ken doing for you? I bet you are like a kid at Christmas? Anyhow, next time I get it on the dyno, I HOPE to be around the 250-275 mark. Should be pretty attainable with the IP maxed, propane and the intercooler in place. Scotty