70mm or 75mm?
 

im gonna order an intake and plenum today and i am wondering what you guys think 70 or 75 mm throttle body? i found this little deal the other day but its only with a 75mm throttle body http://www.latemodelrestoration.com/...0%201&comp=LRS

what is the difference?
and also has anyone heard of pro products if so what have you heard?

thanks guys

I have both their plenum and the 75mm TB. The 75's will lean your AF out a bit and they're not any better for our purposes than a 70. I'd stay with the 70 unless you have a blower/turbo.

I really prefer the Accufab TB's to any other. They've always given me the best results and I've never had to adjust the TPS setting with the Accufab but the PP tb's always have to be tinkered with a bit to sort out the TPS voltage.

Expect seat of the pants gains in the top end (not much but some). Typical dyno results are 8-12hp with both the TB and plenum. The Plenum I like because it comes with NPT threaded vacuum inlets so you can upgrade to AN lines from the rot prone hard plastic lines and rubber connectors.

so will i be able to install the tb and plenum myself
i have a little bit of experience but i dont know much wen it comes to getting into the engine
i installed my cai with no problem
but wen you say like it needs to be tinkered with i would have no clue what to do

yeah, it's brain-dead simple to bolt on. Remember that a lean condition is more likely to cause engine damage than a rich condition so take it and get a dyno run and check your AF ratio. Anything higher than 13.0:1 is too high and says you need a tune adjustment.

The solution to the TPS voltage is simple... you oblong the bolt holes in the sensor body a bit so you can turn it a little one way or the other till the voltage shows .98-ish.

Still.. I'm tellin ya', 75 is not for mild NA cars. Stick with the 70. Same power benefit if not more and no big issues with the install. I bolted a 70mm accufab up for a member of this board on friday and it took very little effort and about 15 minutes. The plenum takes about the same amount of time.

well the only way i can get the deal on the link that i put up before is if i get a 75mm so would it be bad to get that i dont have the money to get them seperate right now

does anyone else in here know the answer to my question besides redneck?
lol

Don't waste your money on one. You gain hardly any hp and they cause your car to run lean. $200 is better spent on an X/H pipe or gears.

Yea, forget that mod, pointless unless you are FI. Only mods I would do from stock is exhaust work and gears.

you can always get the package and then post a "trade" thread. See if some blower car pilot wants to swap his/her 70mm for your 75.

If you want to use the 75, then spend the 500 bucks on a chip and tune, or handheld and dyno tune. I'd spend the money on 3.73's and a bassani catted X pipe.

I can vouch for going with the 70mm since r3dn3ck is the one that put it on my car. I was able to instantly tell a difference between the stock one and the new 70mm. Not so much in the hp deparment, but the throttle was defanitely a lot smoother and more responsive.

A note about professional products TB's... I had 2 minor issues with mine.

First: THe throttle cable spud that locks into the throttle wheel was too big to seat without hogging out the receiver hole a bit. It's not a huge issue but you'll probably have the same basic issue. You don't want to open it up very much but it'll need to be opened a tad.

Second: The cruise control servo connector arm that hooks to the throttle wheel didn't fit either. I had to scrape off several thousandths of an inch of plastic from around the interior of the plastic bit to get it to pop over. It's still hella tight but at least it works now.

So the moral of the story is: No bolt-on is any such thing. There are no simple bolt on's any more. You're likely to always have to do a little tinkering here and there to get whatever part you're hooking up to fit. 00blkstanggt lucked out and his TB install was fairly straightforward but that's not usually the case. He also had the benefit of access to someone who's done a few dozen TB swaps to do it.

Gimme some cowbell!

Yup, I was very fortunate. Thanks to r3dn3ck. I enjoy the tb very much. Good product.

I've got a fever, and the only cure..is more cowbell!

Back when SNL was actually funny...

Damn Straight!

well im going to get gears and a sct tuner for christmas will it be alright on my car till then or no?

yes, it will be good to go without a tune.

I disagree. A lean condition could just cause some significant engine damage. Unless he knows for sure that the AF is going to be safe I think it totally unwise to run a 75mm tb. It's leaned the piss out of my tune.