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Adam
Dodge Dakota
9/17/2001
17:12:33
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 Subject: Turbos
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Message:
Can anyone tell if you have ever heard of anyone turbocharging a 4.7l. I believe it can be done, if you know what you are doing. I don't know how the 4.7l would react under high boost,though.
Any info would help
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toxic13
Dodge Dakota
9/17/2001
19:44:02
| RE: Turbos
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Message:
i'm sure it can be done, though it would be very costly. you wouldn't be able to run very high boost unless you lower the compression ratio. your highest boost capability would only be about 7-8 psi.
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Adam
Dodge Dakota
9/17/2001
20:16:35
| RE: Turbos
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Message:
Yes, that's what I was thinking. I was thinking of using either a big 16G or super 16g from Hahn Racecraft. It's made for a Mitsubishi Eclipse, and is good for about 250-300hp. Although I may opt for one made for a Neon. The one thing I do want for my Dak is a set of forged pistons. I would really like to run about 12-16psi of boost.
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Anthony G
Dodge Dakota
9/17/2001
20:41:16
| RE: Turbos
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Message:
12-16PSI! That's Crazy. I owned a Turbo car that came 8.7PSI stock w/intercooler, then raised it up too 14.7 MAX.
With your already high CR you wont get much boost from your engine. Try 3-4psi max.
You need a re-mapped ECU
Better Exhaust
Lower Compression Ratio
Intercooler
Custom Piping
High Octane Gas
Money+Money+Money
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Adam
Dodge Dakota
9/17/2001
21:07:28
| RE: Turbos
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Message:
Maybe for the 4.7l it's alittle much. I didn't say that I'd be able to go that high. Just that I'd like to. Yes it's pretty expensive, and I don't know that I'd be able to do it money wise. It would probably set me back about $4-6000, but it would be worth it. Even if I got 8psi that's around 56% hp. Compare that to the 6psi that the Kenne Belle puts out... I believe it would be a worth it. Granted you wont have all the bad @$$ features that you would get with the KB kit. I don't know I'd like to do it.
As for turbo cars my friends '97 Eclipse GSX is set to 15psi since he installed the GReddy boost controller, and Apexi BOV. I think hes said it was like 11psi stock.
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Duner
Dodge Dakota
9/17/2001
23:19:23
|  RE: Turbos
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Message:
If that Mitsubishi turbo is only good for 250 - 300 hp then you sure wouldn't want to put it onto a 4.7. Since you are starting out with 235 before you even do anything to it.... the turbo would starve the engine. I know my 4.7 is making about 285-290 hp right now. If I tried to use that small turbo, I would be lucky to see any boost at all... with the turbo spooled up all the way. You have to use a turbo with more capacity than that. Remember, it's a V8 and you have to feed it lots of air. A turbo that's sized correctly for a 2.2 liter 4 cylinder isn't going to move enough air for a V8 unless you run twin turbos. This engine is twice the size. At the same rpm, it needs twice the air.
The compression ratio of the 4.7 isn't going to be the biggest hurdle when you are talking about how much boost it will take. First you have to replace the plastic intake manifold. It should probably take a good 10 to 12 lbs before it becomes a big bomb. I plan on limiting mine to just 7 lbs until it's replaced (the intake manifold). After that you get into the compression ratio problem. With an efficient intercooler, you could probably get away with a good 15 lbs if you had a boost retard system. Who knows, maybe water injection might allow for even higher numbers.
Theoretically - at 7 lbs I should be making in the neighborhood of 425 hp at the flywheel, or somewhere in the neighborhood of 360 rwhp. That also would mean that the torque number should be 575 at the flywheel and 480 or so ft-lbs at the rear wheels.
I'll keep everybody posted!
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Adam
Dodge Dakota
9/17/2001
23:36:06
| RE: Turbos
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Message:
Thanks for the info Duner.
Please do keep me posted. This is something that I've been thinking of doing for quite some time. I just really didn't know where to start. You are the first person that I've talked to that has tried it. I have even sent an e-mail to the turbo wizards at Turbo magazine no reply yet. Hopefully they will soon.
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Duner
Dodge Dakota
9/18/2001
00:11:34
| RE: Turbos
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Message:
Well, I haven't quite tried it just yet....
I have most all of the parts and just need to get a few of my ducks in a row before I can install it all. I certainly hope it all goes smoothly. I'm sure there will be some minor set-backs, there always is. But I'm pretty confident at this point that I will have everything covered.
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Adam
Dodge Dakota
9/18/2001
01:00:41
| RE: Turbos
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Message:
What type of exhuast header or manifold are you using to flow your exhuast through into the turbo? Are you using a like a JBA header then piping back around into the IC or the intake?
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Duner
Dodge Dakota
9/18/2001
15:31:08
| RE: Turbos
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Message:
The exhaust will run thru a specially manufactured manifold which will also take exhaust from both sides of the engine and run it into the turbo. Then the turbo dumps the exhaust in to a single 3" pipe which will connect to my existing exhaust system. On the intake side of the turbo, the air comes thru an air cleaner, gets pressurized by the turbo, goes into an intercooler and out to the throttle body.
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Adam
Dodge Dakota
9/18/2001
19:01:30
| RE: Turbos
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Message:
That's a pretty cool set-up. Sport Compact Car magazine has been running a HUGE turbo series for the last few months. You should check it out. It may provide you with some info.
www.sportcompactcarweb.com
or www.gr8ride.com
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Duner
Dodge Dakota
9/18/2001
19:10:15
| RE: Turbos
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Message:
Thanks Adam, I'll have to see if I can find one of those to check it out.
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pwhite
Dodge Dakota
9/18/2001
23:00:38
| RE: Turbos
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Message:
Duner what have you done to your 4.7 to get 285 to 290 hp at the fly wheel? and i cant remeber if it was you or someone else who said they tried colder plugs in their 4.7. if it was you what was the part number and how did they do ?
thanks for your input
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Duner
Dodge Dakota
9/19/2001
03:07:00
|  RE: Turbos
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Message:
The main thing I did to make the additional hp and torque was to get the pcm re-programmed. Add to that a K&N, '01 Throttle Body, 3" Cat-back with 70 series Flowmaster,3" MorFlow catalytic convertor, and an IAT adjustor.
As far as the colder plugs.... I tried some and my engine didn't like them at all. I run the 5224 Autolites right now.
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plwhite
Dodge Dakota
9/19/2001
17:32:29
| RE: Turbos
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Message:
I would still like to know the # of the colder plugs. thanks
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