What does High Output mean?
03-31-2011, 03:52 PM
#1
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Model: Cherokee
What does High Output mean?
Well I was just wondering if what high output means, I have a 1997 Jeep Cherokee sport and wanted to know if I was equipped with a high output motor and tranny.
My jeep is a little loud by itself and is very quick if that means anything..
My jeep is a little loud by itself and is very quick if that means anything..
03-31-2011, 03:58 PM
#3
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HO is the change from Renix to OBDII injection, this alone netted some extra HP from the 4.0 mill.
They also changed the head for better flow and this picked up a few more.
AFAIK all the 4.0's after Renix injection was retired became HO.
They also changed the head for better flow and this picked up a few more.
AFAIK all the 4.0's after Renix injection was retired became HO.
03-31-2011, 04:24 PM
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Year: 1993
Model: Grand Cherokee
Engine: 5.2L MPI V8 (318)
The injection like stated above was improved with the H.O., and also the throttle body is improved I believe. (Anyone verify this?)
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03-31-2011, 05:36 PM
#8
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couple more hp, different cam and heads, etc.
Its just Chrysler being Chrysler... They like to name everything.
Its just Chrysler being Chrysler... They like to name everything.
- 1987 4.0L (242 CID) I6 RENIX FI 242 - 173 hp (129 kW) @ 4600 rpm, 224 lb·ft (304 N·m) @ 4000 rpm
- 1988-1990 4.0L (242 CID) I6 RENIX FI 242 - 177 hp (132 kW) @ 4600 rpm, 225 lb·ft (305 N·m) @ 4000 rpm
- 1991-1995 4.0L (242 CID) I6 MPI (High Output) - 190 hp (142 kW) @ 4600 rpm, 235 lb·ft (319 N·m) @ 3200 rpm
- 1996 4.0L (242 CID) I6 MPI (High Output) **Chrysler Block Cast** - 190 hp (142 kW) @ 4600 rpm, 235 lb·ft (319 N·m) @ 3200 rpm
- 1996-1999 4.0L (242 CID) I6 MPI (High Output) **Chrysler Block Cast** - 190 hp (142 kW) @ 4600 rpm, 235 lb·ft (319 N·m) @ 3200 rpm
- 2000-2001 4.0L (242 CID) I6 MPI "Power Tech" - 193 hp (144 kW) @ 4600 rpm, 243 lb·ft (329 N·m) @ 3200 rpm
04-01-2011, 02:00 PM
#9
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Year: 2000
Model: Cherokee
Engine: 242 C.I.D
couple more hp, different cam and heads, etc.
Its just Chrysler being Chrysler... They like to name everything.
Its just Chrysler being Chrysler... They like to name everything.
- 1987 4.0L (242 CID) I6 RENIX FI 242 - 173 hp (129 kW) @ 4600 rpm, 224 lb·ft (304 N·m) @ 4000 rpm
- 1988-1990 4.0L (242 CID) I6 RENIX FI 242 - 177 hp (132 kW) @ 4600 rpm, 225 lb·ft (305 N·m) @ 4000 rpm
- 1991-1995 4.0L (242 CID) I6 MPI (High Output) - 190 hp (142 kW) @ 4600 rpm, 235 lb·ft (319 N·m) @ 3200 rpm
- 1996 4.0L (242 CID) I6 MPI (High Output) **Chrysler Block Cast** - 190 hp (142 kW) @ 4600 rpm, 235 lb·ft (319 N·m) @ 3200 rpm
- 1996-1999 4.0L (242 CID) I6 MPI (High Output) **Chrysler Block Cast** - 190 hp (142 kW) @ 4600 rpm, 235 lb·ft (319 N·m) @ 3200 rpm
- 2000-2001 4.0L (242 CID) I6 MPI "Power Tech" - 193 hp (144 kW) @ 4600 rpm, 243 lb·ft (329 N·m) @ 3200 rpm
04-02-2011, 07:25 PM
#11
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Silly question. It means that the crankshaft is about twelve inches higher off the ground than it is in most other vehicles - which we Jeep owners consider to be lower output, relatively speaking.
07-12-2017, 08:02 AM
#13
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
HO myth buster
Renix in 90 made 182 HP. HO in 91 made 190 HP. That's 8 HP difference.
HO only made more HP than Renix at higher RPMs and not a bit more torque. HO had a 58 mm throttle body versus a 52 mm throttle body on a Renix. That’s 20% more air available through the HO throttle body. The HO also had a better design header. See where I'm going with this?
It’s only a 4% horsepower increase…..
The whole 8HP was not mostly from the head, but from the bigger TB and better exhaust manifold.
Put a 60mm TB from www.strokedjeep.com on your present manifold using the Renix head, eliminate the "crush" in your headpipe with proper re-routing, and go for it.
HO stands for Highly Overrated.
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Renix in 90 made 182 HP. HO in 91 made 190 HP. That's 8 HP difference.
HO only made more HP than Renix at higher RPMs and not a bit more torque. HO had a 58 mm throttle body versus a 52 mm throttle body on a Renix. That’s 20% more air available through the HO throttle body. The HO also had a better design header. See where I'm going with this?
It’s only a 4% horsepower increase…..
The whole 8HP was not mostly from the head, but from the bigger TB and better exhaust manifold.
Put a 60mm TB from www.strokedjeep.com on your present manifold using the Renix head, eliminate the "crush" in your headpipe with proper re-routing, and go for it.
HO stands for Highly Overrated.
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07-12-2017, 03:37 PM
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0