Renix and HO bored throttle bodies available!!

[cruiser54]

Jeff Leigh is still boring Jeep throttle bodies!!

His contact info is email only and he only accepts money orders now.

radiotech123@yahoo.com . And his website: http://strokedjeep.com/

[89 MJ]

I’ve got a Renix one on my Comanche. His website says this:

Quote

A note on Throttle Body finish- Lets face it, these T-Bodies are made from cast zinc and they're used. Their beauty fades quickly after a few years and the Renix units have been on the road for 20 years now.  

 

If you are looking for a shiny showroom finish, I'm notgoing to have what you need. You can order one powder coated or send me one to bore but, I cannot promise a fancy finish otherwise.

This was not my experience at all. Mine came back looking like a brand new throttle body. Cannot recommend it enough!

I held off on buying one for over a year because I was worried about the finish. 
 

Old TB:

 

 

New bored TB:

[pizzaman09]

1 hour ago, 89 MJ said:

I’ve got a Renix one on my Comanche. His website says this:

This was not my experience at all. Mine came back looking like a brand new throttle body. Cannot recommend it enough!

I held off on buying one for over a year because I was worried about the finish. 
 

Old TB:

 

 

New bored TB:

Did you notice a difference in performance or throttle tip in from the larger bore?

[cruiser54]

I've gotten at least 10 of them from Jeff. All of them absolutely beautiful. 

[cruiser54]

1 hour ago, pizzaman09 said:

Did you notice a difference in performance or throttle tip in from the larger bore?

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.
__________________
 

[89 MJ]

54 minutes ago, pizzaman09 said:

Did you notice a difference in performance or throttle tip in from the larger bore?

To be completely honest, I can not tell you for sure. There is a noticeable power difference with the bored TB, but I also did a high altitude CPS at the same time, which advances the ignition timing. Together they both made a difference in power and fuel economy.

 

Here is what I can tell you:

I gained about 1.5 mpg per tank, tested over a few tanks of gas. My truck accelerates much better now and cruises at highway speeds much easier. I can't tell you which one made the larger difference. I can't even for sure tell you that the difference didn't come from just having a clean throttle body, but I'd recommend it. At the end of the day, it is not a very expensive upgrade, even if it doesn't make much difference.

[TurboedMJ]

This may be a dumb question, but I have an HO head, would I need bigger injectors if I switched to the 70mm tb from newcomer racing?

[cruiser54]

Probably not. The ECU likely has enough headroom to handle the increase in air flow. 

[pizzaman09]

1 hour ago, TurboedMJ said:

This may be a dumb question, but I have an HO head, would I need bigger injectors if I switched to the 70mm tb from newcomer racing?

No, very unlikely, you tend to need a lot of work to improve airflow enough on an NA engine to need larger injectors.

[pizzaman09]

2 hours ago, cruiser54 said:

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.
__________________
 

I was figuring that would be the answer.  For the money I think I'd rather purchase a nice Banks header.  My first Comanche had one, I believe the only engine mod it had, and it ran much stronger than my current one.  

 

2 hours ago, 89 MJ said:

To be completely honest, I can not tell you for sure. There is a noticeable power difference with the bored TB, but I also did a high altitude CPS at the same time, which advances the ignition timing. Together they both made a difference in power and fuel economy.

 

Here is what I can tell you:

I gained about 1.5 mpg per tank, tested over a few tanks of gas. My truck accelerates much better now and cruises at highway speeds much easier. I can't tell you which one made the larger difference. I can't even for sure tell you that the difference didn't come from just having a clean throttle body, but I'd recommend it. At the end of the day, it is not a very expensive upgrade, even if it doesn't make much difference.

I've done the CPS mod to make it like a high altitude one, that definitely helped mine.  I haven't seen a noticeable increase in fuel economy, but I don't drive consistently enough to really catch that.  

[Salvagedcircuit]

3 hours ago, cruiser54 said:

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.

 

Chiming in here on behalf of all past and present HO owners:

Quote

HO Is better because blah blah blah

 

I've been eyeing a bored throttle body and doing the IAT relocation, but I need to grab a spare throttle body first before having it bored. I don't want to have my vehicle down for a bit. I'd also love to record some data from my renix monitor before and after the swap to see if I can quantify the difference.

If I can push 200hp 200 ft-lbs and 25mpg, that's goals right there!

 

 

[cruiser54]

Jeff may have cores ready to go and you ship your old one back.

 

That said, he almost always needs cores. I've sent him lots over the years. 

[TurboedMJ]

15 hours ago, cruiser54 said:

Probably not. The ECU likely has enough headroom to handle the increase in air flow. 

 

14 hours ago, pizzaman09 said:

No, very unlikely, you tend to need a lot of work to improve airflow enough on an NA engine to need larger injectors.

Thanks. 

[ghetdjc320]

On 10/30/2023 at 6:04 AM, cruiser54 said:

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.
__________________
 

Bashing on our mopars again   

[cruiser54]

Yeah.  I lived and worked through that transition. 

[Drahcir495]

Is the HO throttle body worth being bored? 

[cruiser54]

Most likely. They can be opened up to 62mm IIRC. That's the size of the hole in the manifold. 

[ghetdjc320]

Keep in mind that the taper improves velocity. When Painless made their “perfect” 4.0 throttle body, they went with a tapered design that necked down to 63mm which is the manifold inlet size.  

[75sv1]

I've removed the restriction on a few HO TBs. I also clean up the inlets cast taper. I put a taper on the outlet side too. So a 60mm bore.  I can't say how much HP a bore TB gets. I have noticed that I do much better on the hills on WV. Also, running a ceramic coated header and the Horseshoe (2000+) intake. I gave a few to a guy who does work on my Jeeps. He seems to like them. I can't find my RENIX TB to bore out. I remember a guy in Florida, Bell that would bore them to 60mm. Said 1 in 4 or 5 he had to scrap. Porosity in the casting. 

[Whitaker717]

I have an 87 and been thinking of doing this upgrade. I have the 4.0, what size should I get? 58 or 60mm? Plug and play I am assuming?

[cruiser54]

Yes. The Renix throttle bodies are all 60mm when Jeff upgrades them. 

[Drahcir495]

Just contacted him now. Will I need the widened $4 gasket too?

[cruiser54]

Does he offer that? If so, yes. 

[Drahcir495]

6 minutes ago, cruiser54 said:

Does he offer that? If so, yes. 

It looks like it so I will get that while I’m at it. Thank you

[Spinnakerblue89]

I have received my 60mm throttle body from Jeff. I can't comment on performance yet as the Jeep is going to be idle for some time due to the interior being redone with new floor pans. I am very pleased with how clean the workmanship is on these TBs.  I do have one Q, however: With the upgraded TB, an instruction to adjust the TPS was issued.

 

What is the logic behind adjusting the TPS and is it 100% necessary? I do plan to follow through with it but I am also asking in case someone else has the same questions going forward.