01ws6m6conv

iTrader: (4)

I have a 2001 ls1.I had the car dynotuned after my tr224/563 112 cam and flp longtube headers and strange 12 bolt with 3.73 gears were installed. I am now installing texas speed ls6 stage 2 heads with 2.04 1.575 valves. I had the stock 241`s on before. My question is,do you think the heads will flow that much better than the old heads and throw off my air fuel ratio enough to require a retune? I dont want to cause any damage.The new heads will bump the compression ratio up half a point or so and my rev limiter is at 6600. Still have stock injectors too.Car dynoed at 396.6 rwhp on a dynojet. Opinions? Thanks in advance,Mike. I know theoreticly I should retune,but do you think if I didnt retune I would be asking for trouble.

PREDATOR-Z

yes, retune

DaveX

It will most likely run lean at WOT since it will be flowing more air with the same amount of fuel. Definitely need to retune before running it hard.

01ws6m6conv

iTrader: (4)

Any idea on the injectors? Any idea if they will flow enough.They are still stock(28 lb?) I dynoed 396 on dynojet and 359 on mustang dyno. I thought I read stockers were good to about 450 rwhp.If I need to retune I may as well add a little more cam since I am adding the ported heads with more compression and yella terra rockers.

69LT1Bird

iTrader: (1)

Here is how you can answer your own question.

If they don't flow enough or give enough of a performance increase worth having to retune, why bother putting them on?

01ws6m6conv

iTrader: (4)

Because the heads were already on my engine but were removed due to a coolant leak.Ends up they were over cnc ported and got into the water jacket in one of the intake ports.Just trying to figure out if I will need to upgrade my injectors to a bigger size before retuning.

69LT1Bird

iTrader: (1)

You could probably bump up to a 36 lb @ 58 psi injector.

Call Jon@ fuelinjectorconnection.com, he will hook you up.

Don't get talked into bigger ones, you don't need them. You get told to buy 42 lber's about ten times or so.

eamador11

it better flow better or that was a waste of money. yes retune it and get 36 lbs injectors too.

01ws6m6conv

iTrader: (4)

Thanks I`ll give him a call. I WILL be retuning,probaly go with Livernois motorsports since they are semi local. Detroit speedworks did my last tune,back in 02 or 03. Just wanted to get some input from the board.

bigboykilroy

iTrader: (48)

Yes absolutely.
Ford Racing Direct has a 42# greentops on sale 199