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post #1 of 16 (permalink) Old 11-21-2011, 11:05 PM Thread Starter
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Circle Track Race Car: Modifcation Questions?

Hi guys i race a 2000 Dodge intrepid on a high banked 3/8 mile oval. Kinda base rules for the class is v6 automatics FWD. A few things about the car it weighs about 3200lbs. We have to run a DOT street tire. The best tire thats legal that we run is a Good Year triple tread. Right now on my new motor for next year i got my heads off and the block is torn down bare. Getting ready to have it hot tanked in the next couple of days. I am doing a bottom end rebuild. (Crank, bearings, piston rings) and replacing all gaskets. Planning on opening up intake and exhaust a little. The big thing that i think will make a noticable diffrence is opening up the throttle body. I was talking with a friend and he said see if one from another vehicle will fit and work that is bigger. I was thinking is opening up some. I have never done it a friend that has built engines says he has a mill you could do it with, but i was thinking that you need the flap the same size otherwise your going to idle at high RPMS. Any suggestions while i do the rebuild on performance increases?

Also i need a right rear spindle/ knuckle. The bolt that goes threw the lateral links and spindle is stuck inside on mine. I need to get it out or get anther one so i can make both lateral links adjustable. I am open to any suggestions to help the performance.
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post #2 of 16 (permalink) Old 11-21-2011, 11:11 PM
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hey you're right in my backyard! I assume your working with a 3.5L? I know people have had companies bore TBs out to 70 MM, and yes, you need to make a new butterfly as well. You;re the 2nd guy on this forum racing Treps. Very cooL!
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post #3 of 16 (permalink) Old 11-21-2011, 11:14 PM Thread Starter
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Nope the 3.2L. I was thinking about doing the 3.5, but i would need the PCM for it and rather put the money else where. I wish i didn't have security on the car, but it does. Hard to find a PCM at a junkyard or u pull it yard.
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post #4 of 16 (permalink) Old 11-21-2011, 11:18 PM
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You can run a 3.5L off the 3.2 PCM.
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post #5 of 16 (permalink) Old 11-21-2011, 11:22 PM Thread Starter
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Other guy on here is probably my Girlfriends dad and team mate. I know he has posted on here. Last year he won 5 races and got a track champion, but we blew up 4 motors. Bottom ends falling apart at to many RPMs. We didn't think a 3.5 would run on a 3.2 PCM cause we tried running a 3.5 on a 3.2 and it didn't run right in his car.
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post #6 of 16 (permalink) Old 11-21-2011, 11:22 PM
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do you have to run stock exhaust? What are the rules for modifications in your class?
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post #7 of 16 (permalink) Old 11-21-2011, 11:25 PM
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Quote:
Originally Posted by 2legit24 View Post
Other guy on here is probably my Girlfriends dad and team mate. I know he has posted on here. Last year he won 5 races and got a track champion, but we blew up 4 motors. Bottom ends falling apart at to many RPMs. We didn't think a 3.5 would run on a 3.2 PCM cause we tried running a 3.5 on a 3.2 and it didn't run right in his car.

It's been speculated that the bottoms ends on these motors are susceptible to getting oil starved at high sustained Rpms I'm sure I've rread that the PCM will adapt, but it needs drive time to adjust the fuel trim. Perhaps it wasn't driven enough? Hopefully someone else can chime in on that... I'll do some digging.
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post #8 of 16 (permalink) Old 11-21-2011, 11:33 PM Thread Starter
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Well that would be cool to know last summer.lol When i had a 3.5 sitting on the floor cause i had a bad knock and i didn't run all but our last 2 races. I am redoing this 3.2 and i got the one in the car that will be my back up so i am just sticking with those. Suppose to be no engine modifcation, but what they can't see or don't know i will be willing to try. Like the throttle body they will never know. Exhaust says stock style exhaust but we have to have 1.5in stinger pipe 18in long at the end of the exhaust. grrrr which sucks. We have the cats out and un clammped the front resinater where it goes in dual and comes out single. I run dueal exhaust with cherry bombs on each side. I am hoping i can get away with it cause the rule does not say we can't run duels. I might have to Y it together with it down to 1 1.5in stinger pipe. I am going to practice at a private session to see how much it will hurt it. When we put the 2 stingers on last year you couldn't know a diffrence. I did have my exhaust fall off up where it dumps under the car and there was no back pressure and they don't like that at all. Killed the power.
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post #9 of 16 (permalink) Old 11-21-2011, 11:35 PM Thread Starter
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I got suspension modifcations covered. The key is a 300m special or R/T rear sway bar. We are required to run DOT tires max size 225-60-16. I run a good year triple tread they are an awesome tire. Runs at about 6400-6500 rpms.
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post #10 of 16 (permalink) Old 11-21-2011, 11:40 PM
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Might want to look into the special front sway bar too!! Is it the original trans from he 3.2L? If you're already killing motors at high RPMs it might not be a good idea but if you use a top gear set from a 2.7L it will move your powerband down a bit, get your RPMs up quicker I have them and mine and I can leave quite a patch now.
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post #11 of 16 (permalink) Old 11-21-2011, 11:47 PM Thread Starter
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Yea. We did the gear swap from the 2.7. Not a noticable diffrence. I might swap it back cause it runs about 500rpms more. I want to try and keep them down a little. If i got to other tracks they are all smaller and it really helps at those tracks.
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post #12 of 16 (permalink) Old 11-22-2011, 12:03 AM
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You can always take and install the gear set backwards - that means there are a total of 4 gear ratios available for your transmission...
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post #13 of 16 (permalink) Old 11-22-2011, 12:06 AM
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Definitely get those RPM's down... maybe look at upgrading the oiling system? For TB boring, one of the members here has gone to http://www.maxbore.com/ with good results. Another possible engine upgrade is better cams from a 3.5 or even a 4.0 out of a Nitro. The 4.0 cams are surprisingly cheap brand new. Also, you could get some first gen 3.5 exhaust manifolds that are said to flow better.
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post #14 of 16 (permalink) Old 11-22-2011, 07:46 PM
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Quote:
Originally Posted by beeblebrox82 View Post
...It's been speculated that the bottoms ends on these motors are susceptible to getting oil starved at high sustained Rpms...
You might want to read Rich's (Krautmaster's) posts in these threads:

http://300mclub.org/forums/viewtopic...261689#p261689
http://300mclub.org/forums/viewtopic...249284#p249284

He claims to have been directly involved in hopping up Mopar engines (state police) over the years and that the bearings on our engines are not designed to run at the high speeds that the engines are allowed to run at by the PCM (bearing diameters too large = very high linear speeds of bearing surfaces, very high oil shear rates).

We've certainly seen a boatload of low end failures on the 3.2/3.2 engines in the last couple of years on the various LH forums.

Quote:
Originally Posted by paintballdude05 View Post
...maybe look at upgrading the oiling system?...
On that, if your car has the oil cooler, decontent it. It steals flow from the main engine supply flow for that loop that is in parallel. I doubt if the questionable temperature improvement is more important than ensuring maximum oil flow. (Think about it: The oil is being "cooled" by the coolant in the radiator that is 200+F. How much cooling is that going to be?)


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post #15 of 16 (permalink) Old 11-22-2011, 07:50 PM Thread Starter
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Cooling the oil is not a problem. I run seperate oil, and tranny coolers that sit in front of the radiater. We went to running 15w-40 oil and have not had problems since.
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