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Gen 1 3.0 engine upgrades #1075325 11/30/14 04:34 AM
Joined: Jul 2009
Posts: 305
B
bodyswapped8789 Offline OP
Mudrunner
Looking to do some bolt on upgrades on the 3.0. Can anybody give suggestions on some swaps/ bolt ons. I'm thinking along the lines of cams, plenum, lower intake, exhaust manifold, bigger throttle body. Has anybody re-tuned the PCM? I know there are several mitsubishi/chrysler models and versions of the 3.0. Are there better parts that will match up with the raiders 3.0. Or even aftermarket parts. Also does anybody know if the DOHC heads mate with the SOHC block that could be pretty cool to take the top end off of a pretty complete 88 stealth I found at the yard and put em on the raider! Thanks


89 V6 manual trans Dodge Raider frame 87 cold weather pkg 2" body lift, Soft 8's wraped in BFG km2 33x10.5x15, JDM Pajero yellow Bosch fogs. Yackama basket. Duel bouncies gen II rear springs,gen II ft brakes,master and booster.
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Re: Gen 1 3.0 engine upgrades [Re: bodyswapped8789] #1075326 12/01/14 04:45 AM
Joined: May 2006
Posts: 524
B
Bernoulli Offline
Rock Warrior
In Australia, I put headers and a tuned exhaust on my 3L. Waste of money plus it was way too loud. Increase in performance and gas mileage negligible.


89 3L V6 5spd SWB, Aisin Manual Hubs, 2 (suspension) seater Raider in Wheeler, OR
Re: Gen 1 3.0 engine upgrades [Re: bodyswapped8789] #1075327 12/01/14 05:41 AM
Joined: Jan 2014
Posts: 295
M
Malykaii Offline
Mudrunner
Problem with individual bolt on mods is they all net marginal gains. Lets say something like a performance intake gains 3% hp and your rig makes 140hp, well congrats on the 5hp you'll never really feel.

For example, my buddy's 04 cobra was running below optimal numbers on the dyno during running. They swapped the stock,intake for something more appropriate and he gained over 50hp, but his supercharger moves a ton of air. Hence a 3% gain on a 680hp motor is significant. Do three bolt ons and you,can gain 100hp then.

All the bolt ons I've tried never did anything for me. Even a re gear just was a mild improvement. The starquest turbo swap, now that was a world of a difference. Doubled my power.

So Dohc heads won't do anything. Like go on Edmunds and see how the late model montero 3.8 (I think) went from single to dual cam in a year and it only lists a few hp gain. There's just nothing more to flow through those extra valves. Now if you did the whole routine with stealth turbo motor, well that's over 300hp waiting for you. (And something I'm debating about for my next rig between a 2.4 dsm setup)

Also, dorky mods tend to do more harm than good. Cold air intakes on 4.6 Ford's can absorb heat causing the air temp sensor to get hot and give false readings. Depe,ding on a setup, a bigger throttle body might cause a slight power gain off throttle as it let's in more air than the ecu expects for that possition creating a lean fuel mix, aka not good. But at a more open throttle it won't offer any gains as a n/a won't realy have any way to take in more airthan it needs. Ebay ecu flashes and chips also just make for a leaner fuel mix. Hence you run less gas and gain hp, at the expense of engine longativity. If a dude with a laptop in Russia can write a ecu flash and workers in China design a cold air intake that produce real results, multi billion auto corporations would do it from the factory themselves.


88 Montero, StarQuest turbo, Kormex 5speed +tuff-pan w/phoenix f. stage2 clutch, 4in lift+33' tires, 4.875 lsd, short-throw shifter, Aisin hubs, SR big brakes, gen2 uca's, elantra alt, and so much more... 16g turbo w/hardpipes + 4.90 locking disk-brake axle soon (maybe lsd or aussie front??)
Re: Gen 1 3.0 engine upgrades [Re: Malykaii] #1075328 12/01/14 06:24 AM
Joined: Jul 2009
Posts: 305
B
bodyswapped8789 Offline OP
Mudrunner
Thanks for the good info, correct me if I'm wrong but with more air for example ( slightly bigger throttle body possibly cams) you can also add more fuel with bigger injectors maybe fuel pump ( more fuel with same pulse width from PCM) Mass air and O2's and stock PCM or retuned should be able to ramp up long term fuel trim while still being able to maintain short term fuel trim. Giving more (longer)burn in the cylinders and maintain stoichometric ratio also giving more power while staying naturally asperated then better exhaust to maintain scavenging and flow. I am well aware that without air being pushed in the intake, vacuum is only going to be able to ingest what the atmosphere has to give but should still be able to produce more power. I agree that one mod alone will not give results but a collaboration of components will make a gain in both torque and horse power. I am not real familiar with the DSM obd 1 PCM to know if this is possible. That's why my thought was to use component from other DSM/chrysler 3.0 from closely related year to achieve better numbers. The stealth uses the same cast iron block so power should not be a problem. I guess my question is, does anybody know what components and from what vehicles could be used to accomplish better performance.


89 V6 manual trans Dodge Raider frame 87 cold weather pkg 2" body lift, Soft 8's wraped in BFG km2 33x10.5x15, JDM Pajero yellow Bosch fogs. Yackama basket. Duel bouncies gen II rear springs,gen II ft brakes,master and booster.
Re: Gen 1 3.0 engine upgrades [Re: bodyswapped8789] #1075329 12/01/14 06:48 AM
Joined: Dec 2007
Posts: 2,331
Mudraider Offline
Body Damage is Cool
Nobody has seemed to mess with any of that, mostly because the changes you talk about are street mods done by Eclipse/Stealth/3000GT etc type folks netting upper RPM gains. Lower RPM's with higher torque is what's needed when off-road generally. They seem to do all right stock with the gearing and everything they have. Trying to improve torque and horsepower, well, you are almost talking redesign of the engine. My .02.


89 SWB, V-6 5SPD, OME Shocks, 16.5X37's, 2"BL, SR axle, Gen2 brakes, Lincoln w/Superwinch
Re: Gen 1 3.0 engine upgrades [Re: Mudraider] #1075330 12/01/14 08:20 AM
Joined: Jul 2009
Posts: 305
B
bodyswapped8789 Offline OP
Mudrunner
Thank you mud raider, your first 5 words said as an anwser to the question could have saved roughly 500 later. However I'm not talking lighter flywheel and roller rockers with higher rev's here. The more hp also provides increased torque. Accompany that with possably decked heads and bored cylinders now you lower the gears and put on a set of kick ass muds with rear locker you have a fantastic recipe for an extreamly capable off road rig. By the way did the wire get rid if the garage sale section?


89 V6 manual trans Dodge Raider frame 87 cold weather pkg 2" body lift, Soft 8's wraped in BFG km2 33x10.5x15, JDM Pajero yellow Bosch fogs. Yackama basket. Duel bouncies gen II rear springs,gen II ft brakes,master and booster.
Re: Gen 1 3.0 engine upgrades [Re: bodyswapped8789] #1075331 12/01/14 12:48 PM
Joined: Dec 2007
Posts: 2,331
Mudraider Offline
Body Damage is Cool
No, it's listed as Private Party. Mine's locked front and rear, on 35's, pretty much able to spin them in any situation. And mine does ok. I stick with my thoughts of Mitsubishi provided enough torque. Even though all the mods you mention would help with torque.


89 SWB, V-6 5SPD, OME Shocks, 16.5X37's, 2"BL, SR axle, Gen2 brakes, Lincoln w/Superwinch
Re: Gen 1 3.0 engine upgrades [Re: Mudraider] #1075332 12/02/14 05:51 AM
Joined: Apr 2008
Posts: 441
TainterRacing Offline
Mudrunner
I have over bored and milled mine. Heavy head,ex manifolds, intake upper and lower, tb ported full 2.5in ex. New intake pipe kn filter. About everything you could do. It needs Full tunable ecu. Any how I would say it makes a solid 170-180hp with that said needs steep gears.......The Power is in the upper rpms 4500+. Was it worth it..... For that power no.....a stock 3.5 would be more hp and more tq. Will be turbo in the near future. With a good ecu. If you really want more power you need boost or due a motor swap.

Last edited by TainterRacing; 12/02/14 10:39 AM.

1997 Montero LS with a motor swap a 1990 V6 12valve ported heads full 2.5in Ex I run stock tire size for Daily use, off road have 33x12.5 working on going trubo.
Re: Gen 1 3.0 engine upgrades [Re: TainterRacing] #1075333 12/03/14 12:53 AM
Joined: Jan 2000
Posts: 8,160
Lloyd Swartz Offline
Web Wheeler
Better to focus on gearing

Re: Gen 1 3.0 engine upgrades [Re: Lloyd Swartz] #1075334 12/03/14 01:34 AM
Joined: Feb 2005
Posts: 1,511
ryany Offline
Body Damage is Cool
An upgrade such as a larger throttle body is only going to improve performance if the existing throttle body is the main restriction in the intake system. If the intake manifold, intake tubing, or air filter assembly creates more of a restriction then there's nothing to be gained by a larger throttle body.


95 Montero SR
3.8 MIVEC, Advance headers, 2 1/2" exhaust, Magnaflow muffler, OME shocks & rear springs, 2" body lift, 3" tank lift, 4.90s, TRE front locker, factory rear locker, Roger Brown Rock Sliderz, 315/75r16 (35") tires, Sport big brakes
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