kenmastajy

its eventualy going on my jeep wrangler it has the 4.0 inline 6 cyl. i want one turboed real bad im getting another engine getting it plated getting all new internals rated for some dam high horse power but i want it them to spool up early in my rpms since im a rock crawler and a mud junky. so what turbos would give me the same out put as that t60. figuring itd be cooler to have two spool and two bov.

MPR

Honestly, you don't need two turbos to get what you want for this application. A properly sized single turbo will do the job perfectly.

Don't forget, when you have two turbos, you have half the energy going into each turbo to spool them, so they won't necessarily spool quicker. I'd put money on it that a properly sized single turbo will spool quicker than two smaller ones.

I don't consider installing two turbos just because it's 'cool' as a valid reason, but if you have the money, you can do what you want...lol.

kenmastajy

im also looking to go down to my local strate roads with lots of lights and blow away poeple with riced out stuff. im figuring that having it go tsssssst tsssssst will genarate alot more wtf did he do to that thing. I would prefurably dual charge it but that seems a bit over board, it would give me low end to top end power and thats what i want. i really dont want to be on a rock in four low and have turbo lag cuz when the turbo spools up its guna throw me off the dam thing.

MPR

Ok, with two same-sized turbos or one single larger turbo, the out come will be similar. Because you are splitting the available energy 50% to each turbo, the twins won't spool quicker.

The 4.0L inline 6 is quite torquey and low-revving, so a properly sized single turbo will spool quick and give you good low-mid power and some top-end power.

One other solution would be to run two different sized turbos sequentially/compounded. Basically it's like the two sequential turbo supra's, where it spools the smaller turbo first, then the larger turbo takes over in the higher rpms. This type of setup can be quite complex to engineer, but not impossible or unheard of...

Give me a hp goal and max rpm for this engine and I'll see if I can show you how one turbo can do the job quite well.

kenmastajy

max rpm now is about 5500 i want to up myself atleast 100 possibly alot more all the parts im getting will be rated at 800hp but idk if the block even after i get it plated will handle that.

boosted86

Two T25 mitsus would spool quite quickly, but for a 4.0 Jeep, I would suggest a smaller T3/T4 setup, like a .63 hot side with a 50-60 trim compressor wheel.

MPR

800hp seems a bit extreme for an off-roader. Though I know you also want it to be a street-fighter... How much power do you really want to make, realistically?

Just to give you an idea; To get 800hp from that motor, revving to 6000 with peak hp at 5500, it's estimated you'd need about 30psi+ boost. For a single turbo, you'd need something like a garrett GT4202R 102mm turbo (or similar) which is quite large and dyno-queen-ish. To achive this with two same-sized turbos, you need two garrett GT3782 82mm turbos which are still quite beefy and like I said before, since you are splitting the available exhaust energy for each turbo by 50%, they won't spool any quicker than the single GT4202, so there isn't really a benefit to using two turbos besides the cool-factor. lol.

If you aim for, say 500hp and you want your torque peak in the low-mid-range, but want some left over up top for the street, you could go with something like a mitsu TD04 13T which will give you peak torque between 3000 and 5500rpm with good top-end efficiency to rev to 6000.

MPR

^I must correct my last post. I said the wrong turbo in the last paragraph. I meant to say the GT3582R turbo, NOT TD04-13T which would be WAY too small...lol.

**Edited version:

If you aim for, say 500hp and you want your torque peak in the low-mid-range, but want some left over up top for the street, you could go with something like a GT3582R (or similar) which will give you peak torque between 3000 and 5500rpm with good top-end efficiency to rev to 6000.