3.5hfm and cams do I need a tune??

[1991 e30 bmw 318is]

here is the plan... s50 cams and 3.5hfm with bbtb..... can I just get a chip for cams?

Asking because I don't think there is a tune for cams and hfm.... so can I just get a chip for the cams, Then get a wideband and fuel and get the pressure set up where it belongs? I know the stock injectors can get bumped up a little so i don't see the point in getting bigger injectors.....

does that make sence? or can I just tune the cams and get the bbtb and 3.5hfm and be ok?

[lifeiskaos]

yes you need a tune. yes there are tunes for cams and HFM and bigger injectors. you'll be fine.

http://www.racersmarket.net/index.php?page=shop.product_details&flypage=garden_flypage.tpl&product_id=21&category_id=63&option=com_virtuemart&Itemid=93

[1991 e30 bmw 318is]

so i need injectors too.... .... o well who makes that tune?

[Van Westervelt]

If you are using a 3.5 hfm, you need a tune for it.

[lifeiskaos]

so i need injectors too.... .... o well who makes that tune?

TRM... there is a link in my post. you can call them and ask if stock injectors will handle your upgrades. i'm not sure if they will or not. usually BMW sizes their stock injectors to be pretty close to their full capacity on a stock engine though.

[1991 e30 bmw 318is]

If you are using a 3.5 hfm, you need a tune for it.

ok good.... my next question is why? runs lean? or rich? or what? with out the tune.........

[1991 e30 bmw 318is]

TRM... there is a link in my post. you can call them and ask if stock injectors will handle your upgrades. i'm not sure if they will or not. usually BMW sizes their stock injectors to be pretty close to their full capacity on a stock engine though.

ya i was at the dealer talking to the guy there he is sure the stock ones can just be bumped up and do the trick...... so with the 3.5hfm they want the bigger injectors and tune because it would be lean..... hummm.

[lifeiskaos]

ya i was at the dealer talking to the guy there he is sure the stock ones can just be bumped up and do the trick...... so with the 3.5hfm they want the bigger injectors and tune because it would be lean..... hummm.

i have no idea what the fuck you just said

[1991 e30 bmw 318is]

if you just put a 3.5maf on with no tune then it runs lean..... I found a chip on trm site that will work for me tho...... not sure how good it is tho...... also might get a custom tune, from a local guy.