Hi, i'm new to this site. I cam from NKFBA.com. I cme over here cause jim at DCS told me this would be a great place to learn about crossfires upgrades. OK, i have a 1982 trans am LU5 crossfire in it. everything on the car is all orginal. nothing has been rebuilt. Will with the help i need is head and cam info(no bigger the 170cc runners on the heads), i'm going to storke it out to a 335, buying a renegade intake from DCS along with other ecm upgrades, tbi boring to 2". manily what i need to know will be the fuel pressure setting, injectors lbs for the injectors, head and cams info and any other info about the modding will be helpful. thanks.

 

hell just delete my account. i get better response out of a 4 cyl forum or ppl saying at least they tried. never heard of a fbody club that won't help its members or even try to to help. so JUST DELETE THIS ACCOUNT?

 

Well you have the intake covered.
Heads? The head volume needs to be addressed. for a 305-335 CID. L98 vette heads are 58cc> what is your current volume on a stock 305? Dart sells 49cc iron but that seems too small. Then Dart goes to 64cc. trick flow has an aluminum 56cc for $1050 a pair.
I would stay with a stock TB for now. Later can swap larger after you learn the tuning. Same on injectors. I would start with upping fuel press to around 16-18. Ad a FP gauge.

Can. Check comp cams or crane cams with a 113-115 LSA. 210-216 @ .05 would be OK. A larger cam wouldd make tuning more difficult.

TPI fuel pump.

You questions were very broad in scope so that may be why no responses.

OBTW you will get suggestions to move on up to a 350-383 CID for sure. But I like the idea of a 305 stroker.

 

take that crossfire crap out and throw it in the trash...... save up some dough and get an LTX/LSX swap with a t56. what your looking at spending on that cross fire you could have a descent lt1/t56 combo that'll kill that motor and you will have a good foundation for future mods. just my

 

it maybe a better way, but why should i destroy something that is going to be worth more in the future. have you forgot that CFI is only 82-84, so there rare to find, and calssic car people like seeing oginal in cars. and FIY theres a crossfire that runs 12.90's. which is really good and better then most cars. so don't diss the CFI unless you know everything that is good and bad bout them.

 

I know that there 58cc, but not to sure about the exhuast or intake yet, still trying to find that. i'm working on the fuel pump. going to put a 33-40psi fuel pump and knock it down to 14psi, so the stock can run right with the right psi. i didn't think they was wheni wrote yet, but thats what i get for staying up to long. i know i will. but i'll stick with the 305 cfi. atleast it be worth lots of money one day in the future. i want to try and stick with 58cc if possible, but i can't really go over 170cc, atleast thats what DCS told me. I'm sure thats right, since i 305 can't move that much air. if i have to i'll with 64cc, but i'll need compression for now, since a supercharger/turbocharger is a long way form being made for it. thanks for a start on things.

 

And I will say this"IF your going to tell me to switch to a ls, lt, or a 350-383, please don't tell me to. i'm here to get help not to listen to someone talke bout how its beter. i now its better but i'm staying with CFI no matter what."

 

If you go with 64 cc and decrease your compression ratio you may not be able to take advantage of the power potential of a cam upgrade as well as the potential of the flow of the better heads and that Renegade manifold and free flow exhaust. There is a static compression ratio and more importantly a dynamic CR. TF heads BTW are 175 cc runners. I believe 56 cc chambers are meant for 283-327 engine class.

Maybe someone knows what the resulting compression ratio will be as well as what a stocker has?

 

theres a reason GM only made the CFI from 82-84....... ive seen slightly modded LSX and LTX cars run 10s. as for it being rare it very well might be but to me it seems like your looking for performance... if not you wouldnt have posted this thread.

 

then take your crossfire off - cover it with plenty of grease - put it in a box and erect a little shrine to it. then get yourself something good. there were 3 basic problems with the 305. it was starved - so you need a better way of getting gas to it - tpi is what i switched to.
it needs a good way to process that gas - get yourself a zz4 or hotter cam - and it is choaking everyplace it goes - rework the heads - screw in studs, or pin them, go with 1.6 full roller rockers on the intake, 1.5 on the exhaust - a zz4 will give you .474 on intake the 1.6 will raise that to about .500+ and the .510 on the exhaust will be fine for the exhaust side with 1.5's. you will need springs - the zz4 cam comes with springs that will handle up to .530 - plenty for a 305. you will also need to cut down the rocker studs base - so the 1.6 will not hit them.
then to finish up the breathing you will need some headers, maybe hooker 2055, into a 3 inch y pipe - a new 3 inch cat - and at least a 3 inch mid pipe into the exhaust of your dreams.
you can do all that without even taking the engine out.
the tpi if you get a maf - direct bolt up and if you get a map there will be some needed changes to the 4 center bilts to change the angle from 72 degrees to 90.
dont waste your time on the stroker - it will only make your wallet liter.
and before i forget - there is this little red line at the top of the page - and the fifth word from the right - is "S E A R C H" - and with a question you can get all past information on this topic. here is another word to remember " G O O G L E"
and the people on this board are darn friendly - but they are not your servants - sometimes you actually have to wait until they finish with their projects, and then there is something called work - and that comes before answering a question that has - with just the use of the word crossfire in search - 20 pages of links to this very board with answers to all sorts of crossfire questions. try looking there too - all kinds of good crossfire information.
you have made a total of 5 posts and everyone directed to you. have you gone out to see if anyone asked a quesiton you know the answer too, so that you can help them?
what goes around comes around.
class is over for the day.

 

i'm sure ls and lt's run faster. i'm not looking to run into the 10-11s. thats not my goal. i already have my goals out with my car. and i'm not going to listen to someone who is not willing to listen. the only thing wrong wit hthe cfi was manily the fuel pump. i'm not looking for that much perforamnce. like i sadi there is goals for this car and goals i'm willing to stick by no matter what someone whats to say bad bout it. the crossfire was a conversion to EFI. its was the first form of TBI. then they went to a 2barrel tbi instead of 2 tbis. theres not much diffence between the CFI and the crossram.i will still perefer crossfire to any other system. i don't see nothing wrong with them. i know where most of the weak points they put on them and know where to add strenght to keep it going.
and to Ronny, i don't want to decrease cc on the heads. i'm talking to DCS tomorow and let him see what would be good.

 

friendly, thats why i'm being told to destroy a a rare car casue i what just alittle performance on it. thats seems friendly to me. then we get people like you who whats to say switch to something else instead of trying to help out. i now there not severnts but its sad when over 20 people look at your poat and not one even trys top help you out. to me thats more rude then anything. hell, even if i don't know i at elast try to help someone out that ask for help on questions. so now be a good time for you to just leave the post unless you willing to help. i don't want to hear people talk bad about a cfi. if i want that then i'll go and talk to ricers and listen to them. Un less you going to help out with this and not tell me to switch to a differnet type of (CASUE I'M NOT GOING TO A DIFFERENT MOTOR) motor. if i want to run quicker et's then i get a vette for amde for it.

 

I have to agree with crossfire_t/a on this. He is asking for assistance on this forum in regards to his crossfire motor. If he wanted to know about LT or LS swaps I doubt he would have posted in the TBI forum.
Come on guys, you should be a little more forgiving and not crucify the poor guy because he didnt find anything in the search about a 335 stroker crossfire. Grow up

 

you expect help to all your questions in 24 hrs. ? the crossfire did not last because of many problems . the system is not a good daily driver . it takes talent to set it up correctly & maintain . rare yes , why , because its a PITA . check your attitude & grow up and you will find all the info. you need on this site . good luck .

 

not a daily driver. and yet my is driven daily and the problem it has ahs is the weak FP from the factory. thats the only problem wrong with it. i don't see why you think its a bad daily driver. i thinks it s a good daily driver for being over 27yrs old. less stuff to mess up with the old EFI then with news. I check this site theres not much help for crossfire. and i growed up. its just sad you have to intill one person is really to help. and then all the help/ not help is coming in. If you think its a bad daily driver then tell me whats so bad bout? cause i far as a seen my works great(even with the weak fp) still works.

 

ok its a pos. its always using too much gas, its never in tune, it runs hot, the intake starves the engine, its under powered, crossfire is llike the lt is to the ls - a half way measure.
dont ask that question there are too many of us that owned them.
and if it has been a daily driver for 27 years ITS TIRED!
and dont give us that keep it stock crap - you said you wanted new cam, new heads, new intake and to stroke it out.
and it is obvious you still have not learned how to use that search feature, and you still have not bothered to see if anyone else needs help on anything and offered any advice.
everyone on this board will go to see the new posts to see if someone has a problem they have had and if they know a possible answer they will give them a few lines, you still havn't.
and if you are asking for help about getting more power out of a 305 then lots of people are trying to help you but all you can do is act like you'r 16 and mad at daddy for telling you how to do it.
get over yourself - use the search key - or even google crossfire injection problems = you cant spend a week reading what is wrong with them.
dont want our adive then dont ask the question.
part of learning is having people tell you that you are wrong - happens to me all the time, its not personal.
your on your own as far as im concerned.

 

so now you want to talk bout my dad. thanks you know he died trying to save people from a fire. glad to see that your so set bout your self.

 

Biggest problems with a stock crossfire injection is the
small cross section stock intake runners,small runner
intakes,and stock fuel pressure. Once those problems
are fixed system works very well-starts great in all
conditions,runs very smooth,makes good power and
torque,has great exhaust sound,instant and linear
throttle response,good mpg(20+hwy with 5.7) and is
ULTRA RELIABLE-have had C/F on my car for over
15yrs and 100,000 mi. and only problem was a worn
TPS that caused surging and lit the CEL.
In 1994 i bought a complete L-83 5.7 engine from
a burnt-interior '84 vette and installed in my z28,
was dissatisfied with performance,so removed
intake and modified runners with die grinder,TIG
welder ETC to increase flow,also made 1/4 lid spacer
,removed and ported stock heads-these mods
resulted in a DRAMATIC increase in performance.
I have not seen the details on the"renegade" intake
,but it looks like an easy way to dramaticly increase
the breathing potential of a stock crossfire.
I don't worry to much about keeping my '82 z
totally factory original,but i do keep it"period authentic"
(a G-tech did slip in though)

 

the renegade is like the X-ram but able to use all stock componets on it with haveing to buy a lot of extra stuff to fit to it. Its like the stock but modfied from stock based to fit right with everything. thats great help 8t2-chev. thanks. glad someone saw somthign with a cf instead of bring it down and tell me to go to somthing else. Thats sad to hear bout the surging. thanks.

 

I agree this is someone asking for assistance on a CFI problem but you have to also have patience as many on here don't care for it. Personally I love it on my '83 Z28 and plan on keeping her as original as possible. Also CFI was available '82-'83 F-Body LU5 and '82 & '84 Y-Body L83.

The LU5's stock compression was 9.5:1. You are correct that the factory fuel pump's output is barely adequate ,even if it was a carb motor. The factory specs are 9 to 12 psi when it's really happier at 14 to 18. The intake runners are the next problem , while providing great off idle response, restrict potential in any other area. Port matching and cleaning up casting flash will greatly help. Next is the exhaust as the LU5 shared the LG4's completly. You can either go headers ,specify for the L69, along with the cat and catback for the L69. I decided to go with L98 exhaust manifolds/y-pipe with the L69's cat/catback.

I hope this small bit of info helps and welcome to TGO.

 

Crossfire_t/a, If you are worried about the value of your Crossfire, I would really consider ANY mods you are doing to it as it will eventually de-value your car If in fact you still want to modify it may I suggest going to this site...........http://www.crossfire.homeip.net/ Completely dedicated to the Crossfire way of life. Anyone on this forum (and I say this with complete respect) that doesn't believe a Crossfire can run n gun has either not owned one, or if they did....simply didn't have the time or know how to make it run as it should

Oh.....Welcome to the forum! many fantastic folks on here and most are willing to help.

PS Proud owner of a 1983 Z 28 Crossfire completely stock. (eeerrrr except the 350 instead of the 305)

 

I would suggest stashing your original 305 for any number matching resto job in the futer and getting a later model roller 305 (or even 350, but that'll kill your top end if the XF cant be made to flow a lot better) and a set of Vortec 305 (small chamber) heads.

Infact Kill two birds at once and get a Vortec 305 from a van or something

I dont know what type of work is needed to fit the XF intake to vortecs as far as raising the top odf the flange to clamp the gasket, but even if welding is needed it's nothing that cant be un-done with a grinder.

A newer vortec motor should get you a solid block and a good roller valvetrain so it's not un realistic to just drop it in as-is (with a nice cam) and get great performance.

I do agree with a post above about the stroker kit though, you'll spend a lot of money adding displacement to a motor with a flow limited top end.You'll just end up with a narow power band that'll be fun for laying rubber but not exactly fast.

A roller cam setup is exactly what you want in this situation. They allow more mid range lift with practical lift #'s livable duration. For a long runner street motor a roller cam makes for an entirely different motor, and that's a good thing.



The good news is the Vortec 305 heads like the 305 it's self are considered throwaway parts, so you should be able tofind a bargain easy enough.

 

The Renegade is nothing like the XRam. because it is a true 100% OEM replacement performance manifold made specifically for Crossfires.