Cammed PI engine swap safe to run without tune?

I put some cams in my car and it ran. May run a little rough and may have to be driven a certain way but I would think it would be fine. But as far as not having the money to tune it, I would wait. What if you do need it tuned? Then you are just having it sit there till you can afford it.

My girls mustang hasn't had a tune and we did heads cam and intake and she runs like a rapped ape... Little tricky to set off in it after it sits idling but not too bad...

 

I had a pi head/npi swapped 270 cammed car and It will run but it wont run well. I had to up the injectors from stock to at least a 30, and upped the fuel pump from stock to a walbro 255. My car would BARLEY run with those upgraded fuel items, and stock MAF. Yet you may not go as far as I did.


Personally dont do it unless your going to do it right. Throw the manifold on for now RTV it and get it ready for when you can do it right.

 

30lb injectors would be best (gives you room to move, and keep it away from max duty cycle of the injector)
255 walbro - new is 70.00 .... stupid not to do it
I used a Lightning MAF which I got new in box for 90.00 ......

With the amount of air volume the cams will use (over 48-6000) these will be the best for you. Where were you a few years ago, you could have had my whole set up for little moneys.

 

Pi intake swap it untill summer. Save money for the tune while you wait

 

My car ran with comp 270s without a tune. Drove it like that for a while until I could get all the bugs worked out of my swap. Just out of curiosity, did you check PTV with those cams because mine definitely hit piston without valve reliefs.

 

You aren't going to be doing any damage with an unturned cam swap, so "safe" doesn't apply here. It is the driveability that takes a major gut-punt. Like mentioned above, it will run like crapola.

 

This is completely unnecessary and a waste of money. 90% of all mod motor cam-swapped Mustangs on the road are running and performing beautifully on the stock fuel system.

 

Just fyi, Justin @ VMP could give you a base tune for your cam swap. I had his base tune for my highly modified built/procharged car and it ran great. A simple cam tune should be nothing for him. His tunes are a cheap $100. You give him the entire rundown on your mods including cam specs.

A PI intake swap will give you NOTHING in the seat-of-the-pants feel. You will be disappointed

 

Agreed
The poor tiny 4.6l just doesnt have the means to move your butt in a way a 5.4l does ..lol

All the power is on top of the gears.

 

This is where you get to prove it, find out how much fuel you will need, then show me the duty cycle of a stock injector....ALSO you forhet his 97 is return so its different then the 99+ cars. All the parts I listed can be had for under 100 each. I pegged a stock maf with those cams at 6250..

Do your math and prove me wrong

 

I ran mine for about a half a year untuned. Exact same build.

It died a lot, I got used to it though and nothing wrong with bumping the gas petal a little more then you normally would.

If you have the opportunity to do it tho just do it right. get it tuned so you can get the best of what you're doing.

 

I don't need to waste my time. I entered the mod motor game back when you were still learning to walk. You also "pegged your MAF" with just cams? You just don't sound like you know what you're talking about