what size injectors for 450+ rwhp?

[rbridges]

I've got 30# injectors and am in the 350-370 rwhp neighborhood. I think I'm going to take the plunge and buy a TFS engine kit w/o the cam. That includes the heads and intake. I'm guessing I should gain at least 100 rwhp.

I'm figuring I should be in the high 400 rwhp. Two things I'll need to address are fuel pump and injectors. I suppose I'll need to replace the 190 lph w/a 255. I'm also guessing that I'll need 42# injectors.

Any comments would be greatly appreciated. This is new territory for me.

[root]

I would personally go with a set of 42's. They will give you room to grow and provide plenty of insurance.

Ian

[5150 LX]

42's will work well with 450 rwhp

[regattacoupe]

ditto....I'm gonna run the 42lb'rs on my new combo and when i go to a smaller blower pulley or the 8" crank, i'll slap an FMU on for 2 or 3 wild passes and take it back off.


What cam are you gonna run?

[rbridges]

What cam are you gonna run?

I'm sticking with the stock cam for now. I may upgrade that later.

I figured 42s would be fine, but I wanted to hear from experience. So how bad is my gas mileage gonna drop?

[regattacoupe]

get quality meter like a Pro-M shorty and it will much better than if you stick with the C&L. As for the mileage it's all in the tune but they are all different.

[rbridges]

get quality meter like a Pro-M shorty and it will much better than if you stick with the C&L. As for the mileage it's all in the tune but they are all different.

I kinda want to step up to a slightly larger MAF, but I've seen people have trouble with them when they start switching. Mine has worked great, and I'm afraid to mess with it.

[regattacoupe]

I had a hellacious time with my 76C&L, and I wouldn't reccomend them for 42's. N/A with 24's it was great. However there are alot of guys on here that run the 80 C&L with much success. It's hard to beat the Pro-M 80.

[94 SC5 0]

I am running the Pro-M 75 and I get 125 miles to a full tank with my 42's and tune.

[mustang20010]

Give this a try http://www.injector.com/injectorsele...44434a70b7e8ca

I'm sure it's not totally perfect but it'll give you an idea.

[rbridges]

thanks, that is a help. I think it must be conservative b/c it recommends around 50# for a blown engine at 500HP. I see that most people can get away w/42s.

[5150 LX]

I am running the Pro-M 75 and I get 125 miles to a full tank with my 42's and tune.

Holy crappy mileage Batman, lol.

That's about 10 miles to the gallon... figured it'd be a little more than that with 42's

[94 SC5 0]

Dude I wish I was getting more! I just don't understand it?
Maybe the advanced timing will help me out. I was told that they were to much for my current set up when they were installed but I have a 331 going in soon so I just kept them in oppossed to getting some more. Now go figure that we are in a fuel crisis and gas in the DC Metro area is over $2 per gallon and I've never use anything but 93.

[PaxtonBlown306]

ive seen cars make 500+hp to the tires with 30# injectors... granted, thats probably at 100% cycle duty..but still made the numbers. With your setup, you could stick with the 30's, or go to 36's for the power you'll probably be making.



I run 36's with a heads/cam 306 with 8# of boost with no problems.

[RioRedSN95]

I had a hellacious time with my 76C&L, and I wouldn't reccomend them for 42's. N/A with 24's it was great. However there are alot of guys on here that run the 80 C&L with much success. It's hard to beat the Pro-M 80.

Im running a C&L 76MM w/ a 30LB sampeling tube (30LB Injectors) and it works MINT! We first started up the car after the Paxton Install and I had 0 ideling issues w/ it and that was before we even played w/ the throttle and fuel pressure. The car idels just like stock, the C&L works very well w/ my set up.