so will that tranny help on top end or low end? so do I just bore the intake or should I have it ported as well? just trying to get the most bang for my buck.

Noww, I am not sure of the details, but I remember a couple years ago, pwee posted a thread about using something (Maybe even the whole tranny, cannt remember), from a Neon R/T tranny in the eclipse. I did a search and couldn't find the thread, but, like I said, it was like 2 years ago, so it was probably wiped. Maybe Pwee will chime in tho.

That could be interesting, one thing though..... Consider this.....
If you are going to increase the final drive ratio, to me that just seems a little pointless, unless the car is converted to turbo. The gears are going to be so tall, that it seems you might have an issue getting the full potential of the transmission, simply because of not having enough torque.
I'm not knocking the idea at all, just wondering if I am on the right track here.

back on the TB i want to bore it to 65mm but where do i fine the butterfly plate for that. ive searched and searched and come up short. any suggestions

It decreases the final drive ratio a little. Lowering your top speed slightly and yeilding more torque at useable speeds.

Ok. I had it reversed.

As for the TB, I picked up an entire 60mm TB at a "pull-it-yourself" junk yard, including sensors, for $30, and a donor Eclipse TB for $25, sensors included. I am ust using the butterfly plate that came with the Jeep TB.
You can use a 91 - 99 Jeep TB.

yeah I have both TBs I got off ebay for 14 and 22 bucks. but I thought of boreing my TB and the intake to 65mm. so that way they match. but I need a 65mm butterfly. I might go more than 65 just depends on how much meat they have to cut. im just getting all the info I can till my TBs get here. a machine shop might be able to make me the butterfly plate huh?

Yeah, I guess you could have a machine shop bore it out, and make a butterfly plate for you, but machine shops can charge a bit for that.
Honestly, you are not going to get much of an improvement, but hey, if you want to, be my guest.

Check this one out
http://cgi.ebay.com/ebaymotors/95-99-Eclip...emZ110303957884

thats some good info. im going to have to look into that one and see if they r speaking the truth or just trying to sell a product.

and calin someone has to be a guinee pig huh. lol

http://www.allpar.com/neon/performance.html

First off, I HATE the new site format. It sucks ass, and is a serious pain in the ass for me to reply to anything, since 98% of all my posts come from my cell phone, and this forum format is no longer Windows Mobile 5 friendly. I hate it.

As for being a guinea pig, I hear that, I am always willing to be one (as long as it doesn't cost my wallet too much). hehe

calin I thought it was just my phone. this my first PDA. I was about to trade it for moto global. I have the new samsung i907/epix/blackjack 3. depends on who u talk to. but yeah I don't mind giunee pigin it either but after reading up on it I think im just doing the 60mm. but I failed to read if they had a performance exhuast or intake on their test car. I guess ill play it safe on this one lol. I hope this reply goes thru.

Naw, I don't think you need to trade it in for a different phone. I got a first gen Moto Q, and works on 99.5% of all sites just a few sites use a strange formatting that messes with smart phones like ours. hehe
As for just going with the regular 60mm TB, for now, I would really suggest that. If things wor out, and you like it, then instead of having all the machine work done (I honestly don't know how much it would all cost, but it really seems more effort than it would be worth, not to mention I bet expensive), I bet you could get a performance TB from Slowboy, CI Motorsports, or some place else, for close to the same price you would pay to get all the machine work done.
Start simple I always say, and then if you want to get crazy after you know the basics, THEN go for it.
I'm gonna try and finish the TB conversion over the next couple weeks, and then start ordering the parts for a turbo build.
Rods, pistons, and seals look like they will run about $1k from Slowboy Racing, then the turbo kit from Treadstone Peformance another $1500 (I have to call them though and talk about turbo substitution in the kit, and make sure the turbo exhaust mani has a place for an external waste gate), probably another $500 for a waste gate and BOV (unless I can find a 1G BOV for a good price), and the add in another $2K for other stuff..... Yeah, expensive, but I should be ready for the build come early to mid summer. Oh yeah, I just remembered I am buying an AR15 from a buddy for $700, so it's gonna be tight. lol

i tryed 3 times to post a reply to the thread about problems with the new system but no luck. 700 for the AR isnt a bad price. im getting a AK47 within the next 3 months havent decided when though. for the turbo buil good luck man. lots of work. im just going to wait a while for mine. just upgrade my NT as much as i can. then when i do go turbo im going for a stroker. now u have me itching for for my ak.....thanks lol (IMG:style_emoticons/default/gunsmilie.gif)

the stock TB can't bore past 55mm.

ahh did not know that. but i have a jeep tb coming and going to leave it the same 60mm. c how that feels and maybe later go bigger.

Remember the manifold has as mush to do with the throttle body's performance as the throttle body itself. A 55mm throttle body bolted in front of a 49mm hole, with a 45mm gasket between the two, still flows through a 45mm hole. So as far as the throttle body is concerned, bigger isn't always better.
"At 8200 RPM a 122 cubic inch engine will need 290 cfm at 100% volumetric effiency, using the formula ((Max RPM/2)*Displacement)/1728. Rule of thumb is to go 10% over because a naturally aspirated engine can go above 100% volumetric efficiency because of cam overlap, header design, etc. Go above that and you kill low end because of reduced velocity, go below that you starve the engine for air at top end. 110% is volumetric efficiency is 319 cfm."
Based on this, 55 mm does seem to be the option for naturally aspirated (non-turbo) engines."

That is correct. If you throw on a bigger TB, you need to port the intake plenum and find a matching gasket. More often than not people overlook this simple display of physics.

where did you get this? a naturally aspirated most certainly can not operate at 100% efficiency because it operates with a vacuum