OOdynamite

So I just saw an advertisement at the top of one of the pages that said they had a chip that added 95 horse power. So this means that if I get like 5 and hook them up in parallel I should gain 475 hp, right? lol

Who do they think their kidding, how do they even justify that crap?

jfiedler

sure you get 95 extra horses...add new incetors bore your cylinders bigger pistons and so on...sad thing is some people actually buy that crap. now i know on my buddies ford f350 diesel...we put a chip in it and that baby would smoke (litterally lol) the 2008 sti.

JGCORNEL

not going to get gains like that from a gasoline engine, but that number can be easily achieved with a diesel

OOdynamite

Really? What's the difference?

LittleXJ

i think its cuz the was they are made thats why when you see drag trucks and pull trucks that have them i no i not given the tec tearms for it but yea

also i wish my cherokee was desil emagen pooring black smoke into a tailgaters window lol

OldYellowXJ

English please?

Vindicator9000

Oversimplified explanation:

The diesels are all turbo, and usually are built stoutly enough to handle a bunch more boost than stock. At least, pretty much every American diesel pickup is turbo.

A reflash, or a chip, or some method of ECU reprogramming on a turbo simply turns up the boost and adjust the fuel maps to dump enough extra fuel to handle all of the extra air that's moving through the engine... assuming your injectors and fuel system can handle the extra fuel demands.

An engine is really a big pump, moving loads of air, but the air has to be within a certain ratio of fuel. With a turbo, you can very easily dial up the amount of air, and hopefully the amount of fuel as well.

If you run too lean a ratio (too much air), you'll get predetonation, which a diesel is somewhat prone to by design. This is where the fuel is actually igniting early.

Anyway, a proper tune via a chip, piggyback, or whatever you're using can add a ton of power on a turbo car, with some risks. This is how some people are getting 600+HP out of stock block diesels, and also how Mitsubishi gets 300+HP out of a 2.0L 4 cylinder in the Evo. There's actually a guy running low 12s in a stock block 80's Dodge Caravan turbo.

Discounting the turbo part, a diesel functions differently from a gas engine in other ways. They intentionally run super-high compression to begin with (compared to gas). This is why they don't use sparkplugs - because the fuel ignites due to compresion rather than needing a spark. Honestly, I'm not a diesel expert though.

None of this is really possible on an XJ.

OOdynamite

So it will only help if I turbo my jeep first?

LittleXJ

reread this

The diesels are all turbo, and usually are built stoutly enough to handle a bunch more boost than stock.

ower little inline 6s would cost a boat load of money to get this performance

the diesels came out of the factory like this and run on computers and ontop of that they got the turbo so a simple change of the computer will change the way the eng acts and get these numbers

OOdynamite

Ok well, I was gonna say, if I ever ever ever buy a turbo with the intent of putting it on my XJ, could you just beat me with a sledge hammer? Thanks

tandersen45

Can the Renault handle any sort of power tho? 2.1L diesel

91 limited owner

Of all the motor mods. I read about, How come you never see a mild low end torg. cam mentioned? I used to own a '72 Monte Carlo, 350 with a 3/4 race cam, Highway rearend, quick shift kit. Holley quad daul pumper (750 cfm) Eventullay I switched to a 600 cfm Two barrel. You could stomp on it at 70 mph, Next a Firebirb, or Camaro on the highway, already doing 70, And it would ripe the rear end loose. Every time I raced from a dead stop, It would yank the alt. off. But you could cruise the highway at 70-80 and be turning about 1300-1400 rpm. With the air on.

2Evil4U

If you don't mind me asking, how old are you? I only ask because i haven't heard the phrase "3/4 race cam" in fifteen years and had nearly forgotten about the old-school terminology.

Kmart164

Not to mention, when it comes to diesel, more fuel simply means more power. That's why they roll coal with a chip. Running extremely rich, but making more power.

xj922

need me one of them, haha