Moddified Bullitt engine, Injectors?

beebs90 · Jan 24, 2017

Ok so I'm trying to figure out what size/flow rate injectors I'm going to need once I put my motor back together in my 2001 Bullitt . Here's my modifications list,Steeda under drive pulleysSteeda cat back with flow mastersRace catsBBK equal shorty headersInduction kitPatriot performance cams (550 lift I think)comp cams beehive valve springs and retainersported and polished heads (unsure of the extra work that's being done on this front)The motor will be dyno tuned with the new injectors once its all rebuilt.I'm unsure if I'm going to be ok using the 24LB or the 30LB injectors.Thanks for any the help folks.

07GtS197 · Jan 25, 2017

The stock 21# (pink top) are fine. I wouldnt spend the money on new ones.

ttocs · Jan 25, 2017

what are your long term plans with the car?

beebs90 · Jan 25, 2017

Not sure what I'm going to do long term, maybe a much more aggressive cam, but don't know. The stock injectors in this are the orange 19lbs which I think might struggle to keep up.

chris91 · Jan 26, 2017

07GtS197 said:
The stock 21# (pink top) are fine. I wouldnt spend the money on new ones.

Wrong... He is adding worked heads and cams.... You WILL need bigger injectors and quite possibly a bigger fuel pump. I'd go ahead and get 30's, that's what I run with my heads/cams 2v. My fuel pump is maxed out as it sits too.

ttocs · Jan 26, 2017

24s should be just enough, 30s if you plan to grow more later

lwarrior1016 · Jan 26, 2017

Ive got ported heads, comp (stage 5) cams, and 12:1 compression...mine runs just fine on 24# injectors.

98snakehorse · Jan 26, 2017

chris91 said:
Wrong... He is adding worked heads and cams.... You WILL need bigger injectors and quite possibly a bigger fuel pump. I'd go ahead and get 30's, that's what I run with my heads/cams 2v. My fuel pump is maxed out as it sits too.

Do you already have an aftermarket fuel pump? At what power level are you maxing it out at?

07GtS197 · Jan 26, 2017

chris91 said:
Wrong... He is adding worked heads and cams.... You WILL need bigger injectors and quite possibly a bigger fuel pump. I'd go ahead and get 30's, that's what I run with my heads/cams 2v. My fuel pump is maxed out as it sits too.

Where did you get that from? 19# injectors are good to about 300rwhp, which is about where op will be at. A full bolt on 2v will never need 30# injectors unless you plan to run e85 and then youll need bigger ones. Even with heads and cams op wont make enough to warrent bigger injectors. Just look at ttocs and Iwarrior...

is your fuel pump factory?

ttocs · Jan 26, 2017

07GtS197 said:
Where did you get that from? 19# injectors are good to about 300rwhp, which is about where op will be at. A full bolt on 2v will never need 30# injectors unless you plan to run e85 and then youll need bigger ones. Even with heads and cams op wont make enough to warrent bigger injectors. Just look at ttocs and Iwarrior...

is your fuel pump factory?

I thought the bullet had 270hp or so? not sure why we would recommend to use smaller injectors if he already had the larger and is getting a tune.

07GtS197 · Jan 27, 2017

ttocs said:
I thought the bullet had 270hp or so? not sure why we would recommend to use smaller injectors if he already had the larger and is getting a tune.

Theyre rated at 265 from the factory. Its not going to make much more than a similar motor running a pi manifold. I wouldnt recommend using larger injectors just because its a bullitt motor.

From his original post its unclear whether he has the stockers but he doesnt have new ones yet.

ttocs · Jan 27, 2017

correct but add heads/cam/exhaust like he did and then add the fact we always want a little more and there is no way in hell I would recommend 19s again when he already has the bigger injectors and a tune planned. Just doesn't make any sense.

07GtS197 · Jan 27, 2017

ttocs said:
correct but add heads/cam/exhaust like he did and then add the fact we always want a little more and there is no way in hell I would recommend 19s again when he already has the bigger injectors and a tune planned. Just doesn't make any sense.

That 265 is at the crank, its not easy to make 300rwhp even on a full bolt on na 2v. Again the bullitt intake isnt doing him any favors really. I wouldnt spend the money on injectors until a particular setup is in mind. He could want to do something later on down the road and needs to get bigger injectors.

chris91 · Jan 27, 2017

19's at 300hp is at 100% duty cycle....

Yes I'm running the stock gt fuel pump and according to my Aeroforce gauges it's maxed out.

chris91 · Jan 27, 2017

07GtS197 said:
Where did you get that from? 19# injectors are good to about 300rwhp, which is about where op will be at. A full bolt on 2v will never need 30# injectors unless you plan to run e85 and then youll need bigger ones. Even with heads and cams op wont make enough to warrent bigger injectors. Just look at ttocs and Iwarrior...

is your fuel pump factory?

What are you talking about look at ttocs and lwarrior? Scott has a pushrod supercharged 5.0..... Lwarrior is running 24lb injectors and I'd bet he's close to maxing them out unless something is wrong with his setup.

And where are we talking about a full bolt on 2v? The op clearly states he's running ported heads and cams.....

ttocs · Jan 27, 2017

again if he already has the 30# injectors and a tune scheduled I see no reason not to run them. As noted 19# injectors will be quickly maxed out, then needing another tune/change to get things rights. Do it right, do it once, run a little more then what you need now and hope its enough when you want a little more later....

beebs90 · Jan 28, 2017

Just to clarify, I'm currently using stock 19lb orange top injectors, I was under the impression that they couldn't handle 300rwhp and if they could there would be no scope at all for any more power. Don't want to be running injectors on the max when for the sake of 100 to 200 Pounds I could be confident that I wouldn't run out of fuel when getting it tuned.

ttocs · Jan 28, 2017

beebs90 said:
Just to clarify, I'm currently using stock 19lb orange top injectors, I was under the impression that they couldn't handle 300rwhp and if they could there would be no scope at all for any more power. Don't want to be running injectors on the max when for the sake of 100 to 200 Pounds I could be confident that I wouldn't run out of fuel when getting it tuned.

Your impression is correct

beebs90 · Jan 28, 2017

So I've ordered so reconditioned Bosch 30lbs

07GtS197 · Jan 29, 2017

I partially take back what I said because youre right they would be close to or at 100% duty cycle. That being said there is no reason to go to 30# injectors. When I say full bolt on I mean bolt ons and heads/cams though I should have clarified. Still its not like heads and cams will add so much horsepower to an na 2v that itll need big injectors.

With scott aside because I dont know his combo, Iwarrior is still ok running 24's so thats really not an excuse. Even if he is running close to max he's not over it is my point.