Titanws6

iTrader: (35)

Not necessarily, if he's running the stock 28#s, he should be ok.

If possible, you should really look into a street/dyno tune, I feel your TQ output should be higher. Mail-order tunes are great to get you goin, but the dyno will really tell the tuner what adjustment needs to be made.

I have almost identical mods heads/cam/etc and was able to make 412hp, 389tq....so you might have a little more in there. Good job nonetheless.

01ssreda4

iTrader: (96)

243 heads and a TR230 cam? On stock injectors? No. I have seen the 26 pound stockers cost hp on the dyno on a cam only car. Its not safe IMO to run an injector maxed out like that. SAE states injectors should run at no more then 80% duty cycle. Stockers run that at stock power levels. Best bet is to call up FIC and have them spec you out a flow rate, then have them rejet a set of stock injectors. They will come flow matched and are reasonably priced. I bought a set from them when I thought the SVO green tops would be a little overkill for my set-up. They spec'd me a set that flows 42 at our pressure. That will be plenty for my needs. I have a feeling this would be good for you as well and give you a little room to grow also.

King Nothing

iTrader: (9)

what he said. you don't want your duty cycle at 90%, the lower the better and the less chance of leaning out at WOT

alamantia

iTrader: (10)

I think I am ok with the stock injectors

01ssreda4

iTrader: (96)

Think in one hand and **** in the other and see what you got. I hate people who seek advice then don't listen. I'm through with this Betty Boop.

alamantia

iTrader: (10)

I was not seeking advice. In my first post a year ago I stated that I am keeping my injectors. In my post yesterday I was only publishing my results based on some PM's I got over the year regarding my post. Its my car and I can do what I want with it. Its nice to have an opinion but there is no need to be a dick.

nastychevelle

iTrader: (7)

So you'd rather replace your motor instead of a set of injectors? why not spend the $200 and find a used set of 42's just to be safe. in my opinion thats cheap insurance.

alamantia

iTrader: (10)

I dont need to replace my motor. It runs just fine. Thank you all.

thunderstruck507

iTrader: (18)

My injectors are maxed with just the cam...I am def upgrading when I replace the heads with 243s.

You are taking some risks here. Did you get someone to look at your air/fuel ratio??? Do you even have an idea what your injector duty cycle is?

If the answer to either of those is "no" then your "i think it will be fine" attitude is a very poor decision and you are very likely to cause engine damage. For all you know it's running knock retard now and costing you power on top of that.

alamantia

iTrader: (10)

Theres no risk unless I drive with my foot to the floor which I very seldom do. I am not building a motor around one dyno day or to drag race. Again, i apreciate all of the advise, I do, really. But I assure you, I am good with the stock injectors.

thunderstruck507

iTrader: (18)

Alright, but for future reference to anyone else who finds this thread, I would like to state my stock 28.8# (the larger f body) injectors pass the 80% threshold at a much lower throttle position and rpm than WOT. At wot they are running 95-96% and my tune is on the leaner 13:1 af side.

I wouldn't even want to know what it would look like with 243 heads and the more aggressive mid range lift TR lobes.

King Nothing

iTrader: (9)

run it to lean and you will, thats what nasty was referring to when he said you'd rather replace your motor.

like he said and we've all said it's cheap insurance, you don't need to go WOT all the time for the leaning out to hurt your engine . . . good luck with the stock injectors since you've decided to stick with them

alamantia

iTrader: (10)

Upon choosing my current cam this is what i wrote to Thunnder racing in an e-mail...




I have a 2002 Z28 6-speed.

The only modifications to the car now are as follows:


1) Kooks 1-3/4 Headers with low restriction (magnaflow) cats.

2) B&B Triflow cat back

3) 4.11 rear ratio

4) SLP Lid and MAF

5) PCM tune

6) Thunder racing 224/224 112 cam upgraded springs & pushrods.


I just picked up a unmolested set of 2002 Z06 243 Heads with the yellow springs and sodium filled valves.

I am not going to upgrade the headers to 1-7/8 but I will have the PCM retuned.

I do not want a large cam with heavy loping and drivability issues.

My four questions to you before I order anything are...

1) What cam would you reccomend to complement these heads the extent of their flow ability without compromising drivability?

2) If I port them, then what cam would you recommend?

3) Will the springs have to be upgraded?

4) Will I have to upgrade injectors of throttle body with the CAM you recommend?

alamantia

iTrader: (10)

And this was their reply...


If you do not port the heads I would suggest going with the 230/224/111LSA cam. Has the driveablitly of the TR224 but will make more power. If you do go ahead and port the heads the TR227 Extreme would be a pretty good choice for what you are looking at. Specs are 227/227/ - 116 LSA. Lift is .639/.639. It idles similar to the 224 but will utilize the flow of the ported cylinder head better. If you decide to go with the 230/224 you will not have to change springs, but you will definitely have to change the springs with the 227 extreme. As far as the injectors you should be fine with the stock one. Let me know if you have any further questions or if which direction you are looking to go.

alamantia

iTrader: (10)

As you see I did my research, what scares me a little was that the reply about the springs was wrong. I am not opposed to having the car professionaly tuned and before i do that, if I do, I would probably go with bigger injectors, however for the minimal amount I drive the car and what i do with it. I feel that I am ok.

King Nothing

iTrader: (9)

i'm a big fan of thunder racing and i had their 227/224 cam and plan to have a custom 230/227 on a 116LSA but in this discussion i would seek a second opinion. the spring and the injectors statement i totally disagree with and i'm sure most here do. a salesman is paid to sell and not all know the best advice to the customer, most are looking for the $$$$ i'd suggest the 230/224 over that 227 extreme because you wont be changing springs in a year or so if you get the reverse split cam, the lift is killer on that 227. and the injector advice, ask a second opinion especially if you plan to have it dyno tuned eventually. call an a few spped shops and ask them tell them your mods and what your planning on doing . . . call FIC and ask him, he would be the best.

alamantia

iTrader: (10)

I agree which is why i would think he would have suggested selling me springs and injectors.

I contacted fic about resizing my injectors. Something I may consider this winter.

Thanks for all your advice.

King Nothing

iTrader: (9)

no problem man, we're all here to help. good luck on your build and remember to take pics and post up vids when your done with it all

caseypryan

iTrader: (10)

What size injectors would you guys recommend? I'm looking at some 30 lb. I have LT's ORY 243's 11:1 compression and this cam..

bene

iTrader: (16)

If you got your car dyno tuned, you can find out what % duty cycle your inj is at at WOT and part throttle. You can base that info on what size inj you need.

Mine w/ my cam and stock 243, my 28.8lb were logging roughly 65+% at 5500 rpm (93-94 MPH) at part throttle.