[KenCary]

I have seen almost no postings about performance mods on the site.

What happened to all of you?

For that matter, I see very few postings about any mechanical mods.

What gives? Are you all hiding out waiting to post pictures of your Nitro under Nitrous? A 440 wedge in the rear cargo area?

Ken

 

[Quiet Lunatic]

With 460Nm under the hood, I'd fry myself trying to make my turbo CRD any more powerful...

 

[Waldorf]

I have seen almost no postings about performance mods on the site.

What happened to all of you?

For that matter, I see very few postings about any mechanical mods.

What gives? Are you all hiding out waiting to post pictures of your Nitro under Nitrous? A 440 wedge in the rear cargo area?

Ken

I'm always doing something to my Nitro, albiet not necessarily performance mods, more electrical or cosmetic. I'd love to do a dual exhaust and a CAI but I know I would need help with those.

 

[KenCary]

I'm always doing something to my Nitro, albiet not necessarily performance mods, more electrical or cosmetic. I'd love to do a dual exhaust and a CAI but I know I would need help with those.

The CAI is an easy one if you buy a well known brand like K&N.

I'll be more than happy to help you with this if you like.

Of course the Jet chip is easy and I have outlined that one well.

 

[Waldorf]

The CAI is an easy one if you buy a well known brand like K&N.

I'll be more than happy to help you with this if you like.

Of course the Jet chip is easy and I have outlined that one well.

Thanks ken, those items are on my Christmas list! :chuckle:

 

[niftie]

While I sometimes like to be on the leading edge as opposed to the bleeding edge.
(I guess the fact that I got my wife an RT with MyGig sort of exemplifies that).
I haven't seen anything that tickles my fancy yet.

I do like the idea of the muffler swap, as opposed to the whole cat back solution, but I've been admittedly lazy on that one.

Headers do interest me and I hear JBA is making progress with the Magnum 3.5L ones.

I really like the backup camera for the MyGig but I haven't convinced my dealer to let me me have one to try out.

CAI do hold promise but I'm waiting to see some dyno runs to back up that black art.

While the JET chip is a good first baby step, I'm saving my pesos for when SuperChips or Diablo come out with an actual tuner.

When the brakes go, I'll definitely be getting some pads that generate less dust.

 

[KenCary]

While I sometimes like to be on the leading edge as opposed to the bleeding edge.
(I guess the fact that I got my wife an RT with MyGig sort of exemplifies that).
I haven't seen anything that tickles my fancy yet.

I do like the idea of the muffler swap, as opposed to the whole cat back solution, but I've been admittedly lazy on that one.

Headers do interest me and I hear JBA is making progress with the Magnum 3.5L ones.

I really like the backup camera for the MyGig but I haven't convinced my dealer to let me me have one to try out.

CAI do hold promise but I'm waiting to see some dyno runs to back up that black art.

While the JET chip is a good first baby step, I'm saving my pesos for when SuperChips or Diablo come out with an actual tuner.

When the brakes go, I'll definitely be getting some pads that generate less dust.

I posted a Dyno sheet for the K&N on a 3.7L Nitro.

Do a seach on K&N and you will find it.

 

[niftie]

Thanks for posting the chart.
2 things . . .
1. I'd really like to see one for the 4.0L
2. I wonder why they show torque on the chart?

 

[Guest]

I have been talking with some friends here in Oklahoma, I know the crossfire has a 3.2l supercharged engine and have been toying with the Idea of trying adapt it to the 3.7. B&G perfomance will custom program my ECM to work with the changes. but have yet put pen to paper on the idea to figure cost and not to mention weather this motor will handle such an upgrade. any one want to chime in on this

 

[KenCary]

I have been talking with some friends here in Oklahoma, I know the crossfire has a 3.2l supercharged engine and have been toying with the Idea of trying adapt it to the 3.7. B&G perfomance will custom program my ECM to work with the changes. but have yet put pen to paper on the idea to figure cost and not to mention weather this motor will handle such an upgrade. any one want to chime in on this

I would love to see somone do this.

I think that it you keep boost around 7PSI, you should be OK.

I know lots of people who do this without even touching the ECM.

 

[johnandersonii]

I have been talking with some friends here in Oklahoma, I know the crossfire has a 3.2l supercharged engine and have been toying with the Idea of trying adapt it to the 3.7. B&G performance will custom program my ECM to work with the changes. but have yet put pen to paper on the idea to figure cost and not to mention weather this motor will handle such an upgrade. any one want to chime in on this

I think it's going to take a little bit more than ECU programming to compensate for the boost pressure, depending on the amount of boost involved.

A while ago I had a pipe dream of fitting a turbocharger to my Nitro, but I thought it would be too expensive, so never really looked into too much.

For the purposes of your supercharger, I'll assume a modest 7psi of boost (1.5 bar). I also assume, without knowing, that the 4.0L has a volumetric efficiency (VE) of 92% and a air to fuel ratio (AFR) of 14:1

Stock System:
The stock system consumes 390 cubic feet of air per minute. That translates roughly into 30 lbs of air per minute. An AFR of 14:1, yields 7.1% fuel to 92.9% air every stroke. That means the stock injectors, including the standard 20% extra are a minimum of 25lb/hr injectors. The stock fuel pump is a minimum of 150lb/hr @ 41psi. I'm pretty sure the bean counters prevented the factory from putting higher rated injectors/fuel pumps into the vehicles stock.

7 lbs of boost:

The boosted system is moving 48lbs of air. Since the charge air is hotter due to compression, the mixture must be increased to 13:1 to produce a knock resistant mixture. This moves the percentage up to 7.6% fuel to 92.4% air. This new setup will require 31lb/hr injectors with a fuel pump capable of 185lb/hr @ 48psi.

I don't think the stock fuel system will handle 7lbs of boost. You might be able to get by with 2 or 3 lbs of boost, with some timing retardation, but I'm not sure if the expense is going to be worth it.

P.S. I estimate 400 bhp, minus the "cost" of the supercharger with 7lbs of boost.

P.S. -- O.k., last time I tried to post this stuff I didn't have any of my books or reference materials and I came close, but screwed up a few points. This is take 2. The Fuel/Air ratio of 13:1 was just fine, it was the method I was using to calculate the percentage weight of the fuel that was way off. No wonder my other post so was way off 13:1 != 13% in anyone's book.

 

[HighVoltageNITRO]

Why don't you just wait for a little while, say 6 to 8 months, then buy the parts off the shelf. Anything about this look familiar?

 

[johnandersonii]

Why don't you just wait for a little while, say 6 to 8 months, then buy the parts off the shelf. Anything about this look familiar?

Yes!! Now this is more like it. I would very much prefer the power to be made via turbocharger, but thats just my preference.

 

[KenCary]

Very cool. I hope this becomes Nitro option in 2009. Hopefully with a manual trans. I may just have to become a 2 Nitro Family.

 

[acx]

I hope to see that srt6 whatever it is.

I doubt you could use the amg srt6 blower without extensive modes, since it is a positive displacement blower and basically doubles as an intake manifold.

For fuel, I would guess the a/f to be more in the 11-12 rate. Dodge seems to be careful in this light. I know my srt4 (turbo) had a very rich afr which fell below 10 for some parts of the powerband.

 

[v8demon]

I think it's going to take a little bit more than ECU programming to compensate for the boost pressure, depending on the amount of boost involved.

A while ago I had a pipe dream of fitting a turbocharger to my Nitro, but I thought it would be too expensive, so never really looked into too much.

In a speed density type system such as the Nitro, the biggest hurdle would be getting the MAP sensor to read/understand boost and determine what to do when it is seen. The simple solution is to use a one way check valve in the air line to the MAP sensor so that it doesn't see the boost and use an FMU in the fuel line. Aeromotive makes FMU's for returnless style fuel systems, but for the price, it may just be cheaper to get a 3-bar map sensor and tie it into your ECU albeit more technically involved to say the least.

 

[KenCary]

It almost sounds easier and cheaper to drop in a Chevy ZZ4 Crate motor with a carb.

 

[v8demon]

If I were to do it myself I'd actually get a custom intake made for a blower from a 2003-2004 Mustang Cobra. You can find those on eBay for about $300

The whole setup could be done for under $1500...

 

[Pshrynk]

With 460Nm under the hood, I'd fry myself trying to make my turbo CRD any more powerful...

Hell man!!! A turbo oil burner is a great place to start from -- custom chip programming, bigger turbo, intercooler improvements, improved injectors!!!!

I WISH we could get them here in Canuckia.

 

[johnandersonii]

but for the price, it may just be cheaper to get a 3-bar map sensor and tie it into your ECU albeit more technically involved to say the least.

This was my method of thinking, and it would require an ECU swap since the stock one probably wouldn't understand manifold pressure over 1 bar. I hadn't thought about using anything other than MAP to base fuel flow on. What would you base the control of the FMU on? Can you tie it to engine RPM?