99+ intake on renix 4.0

[nitrosloth]

I'm aware that the 1999 and up 4.0 intake manifold is higher flow than the 1998 and previous design. I own a 1990 XJ with a remix 4.0. Can I install this 99+ intake on my motor? Does anything need to be modified? The swap is good for 15-20 hp and I think it would be worth the trouble if its not to difficult. Thanks.

 

[bails85]

Re: 99+ intake on remix 4.0

I don't think the 15 _20 HP gain is very realistic on a stock motor. And from my experience I have found that the renix head is different than the 99+ intake. The ports are non matching.

 

[AZjeepin1]

Re: 99+ intake on remix 4.0

It's a tedious task. I did it on my stroker, but you need a different PS pump and bracket, throttle cable, trans kickdown cable, belt, etc. If you decide to do it and need help, just PM me. Here's the link that helped me a bit-

http://www.cherokeeforum.com/f51/renix-h-o-hybrid-99-intake-yes-possible-yes-its-easy-47578/

The hardest part was finding a belt, but I've still got the part number for it if you need it.

 

[cruiser54]

Re: 99+ intake on remix 4.0

Nowhere near 15 to 20 horsepower. IIRC a Jeep magazine put the later manifold on an HO and only gained 3 HP.

The latest Renix Jeep was 1990. It was rated at 182 HP. The HO is rated at 190 HP. No more torque than a Renix and the HP gain is only at the top end. There are other mods you can do to a Renix to gain HP that are much easier and more effective.

 

[kastein]

Re: 99+ intake on remix 4.0

You will also need a different fuel injector rail, from what I heard from xcm the injector to injector spacing is different on renix and HO. You would want an injector rail off a 91-95 so that your vacuum based fuel pressure regulator and fuel lines fit it, and to keep the supply/return fuelling system.

You will also need to either adapt your renix throttle body to the obd manifold, or adapt your renix TPS and IAC to the obd throttle body.

As for belts, you will need to do some adapting. What I did when converting from my 91 belt routing (iirc the same as renix) was knock the timing indicator boss off the timing cover on the driver side (since it gets in the way of the 96+ belt path), delete the idler between the ac compressor and the valve cover, install the later model manifold and ps pump, then used a 96 serp belt. I am not sure if going from a renix belt pattern to a 96+ belt pattern will require changing wp rotation direction but I doubt it, still something to verify however.

This is not something I would do - the manifold does not improve things that much. Unless you are looking for a reason to swap to the later style belt tensioner and maybe a WJ power steering pump at the same time, which is an excellent excuse to switch manifolds simultaneously.

 

[xcm]

Re: 99+ intake on remix 4.0

You will also need a different fuel injector rail, from what I heard from xcm the injector to injector spacing is different on renix and HO. \

I dont think the injector spacing is differant, but rather how the rail bolt's to the intake manifold. The tips of the injectors also mount slightly differant, about 1/4 differance or so.


Heres a H.O. fuel rail, a renix intake manifold, and an adapter i made. You can see the differance in mounting.


I wouldnt bother, from everything ive read on here from the motor guys, the renix head just doesnt flow enough to take advantage....

 

[kastein]

Re: 99+ intake on remix 4.0

Whoops, I thought it was injector spacing, my mistake.

 

[AZjeepin1]

Re: 99+ intake on remix 4.0

I think it's worth it for guys like me running a stroker, otherwise I wouldn't mess with it.

 

[xcm]

Re: 99+ intake on remix 4.0

If your building a performance oriented stroker on a renix head, your doing it wrong...

 

[AZjeepin1]

Re: 99+ intake on remix 4.0

7120 head for me

 

[87manche]

Re: 99+ intake on remix 4.0

7120 head for me

so it's an HO head.

So you were already going to use an HO manifold and injectors then I assume.

Yes, it will fit. You'll still need all of the 99+ accessories and such.
I also assume you're aware of the need to adapt the renix TPS to the HO throttlebody.

 

[AZjeepin1]

Re: 99+ intake on remix 4.0

I've already got the swap completed when I got my stroker assembled. I was just offering my insight.

 

[87manche]

Re: 99+ intake on remix 4.0

I've already got the swap completed when I got my stroker assembled. I was just offering my insight.

I had a moment, I thought you were the OP replying.

 

[AZjeepin1]

Re: 99+ intake on remix 4.0

Hahaha no worries man

 

[streetxj]

Re: 99+ intake on remix 4.0

I get it now. HO parts on a Renix = Remix. :laugh3:

 

[cruiser54]

Re: 99+ intake on remix 4.0

I get it now. HO parts on a Renix = Remix. :laugh3:

I like it. How about HORenix?

 

[Dr. Dyno]

Re: 99+ intake on remix 4.0

I get it now. HO parts on a Renix = Remix. :laugh3:

HOnix :laugh3:

 

[streetxj]

Re: 99+ intake on remix 4.0

lol

 

[IXNAYXJ]

Re: 99+ intake on remix 4.0

Using an '89 Renix block, ported and polished 7120 H.O. head, '91-'95 fuel rail, CAI, aftermarket header, 99+ intake, 19# injectors, bored Renix TB, no cat and a cherry bomb muffler, we gained about 15 hp over stock. Dyno verified before and after upgrades, 134 rwhp/150 lb/ft after all that work. Through an AW4.

From our experience, if you do the 99+ intake upgrade, you'd need a bored TB and a more free flowing intake to make it worthwhile.

-Matt

 

[gajeepguy]

Sounds like a lot of time and effort for 15whp.