lance m p

I need to clear up some things and give you guys some more information so you're not going in circles. #1 my f/pressure problem [feeling REAL stupid here] was because my duma## was cranking the f/p UP at the control panel on the dyno> ok you say well? I DID NOT have the rear internal reg set in accordance to what I was setting at the panel-duh!! that was causing the lean-out up top>stupid right well I did it! I also found out by JUST taking the f/p/reg apart stretching the spring 3/4 of an inch you will get the desired 14-15 psi needed to fuel the engine-no need for an adjustable reg. once you get that set its done so no need for a gauge either, AND anyone out there porting the STOCK crossfire intake IF you don't get ALL the way down the ports you've gained very little, just port matching the exits is not going to suffice [there cross section is tiny all the way thru the port]you gotta get as far or all the way thru the port, the sides and top you can get more there, the bottom of the port be careful the water jacket is very close under the ports, if you got the money get the Renagade if you're like me [trying to live on a very low income-port the stock one] and the swirl-plate debate> what other TBI engine have you EVER seen w/them?>NONE but if you want to keep them at least modify them, ie: cut the sides out and cut the vanes down-moot point, just take them out, again WHAT other TBI engine has them?? The stock ECM will support the 80lb/hr injectors BUT you will severely over-fuel the engine, you would have to turn the f/p way down then the fuel being at a lower pressure will be heavier and puddling will more likely occur, unless you're running the Renagade and have a larger cid engine like 383-400cid. stay w/the stock injectors they will take up to 20-22psi before they reach there duty/cycle limit, any pics needed on port work e-mail me at lanceperkins1031@yahoo.com, I hope this helps?

74 LS4-454

Hello Lance, some good info, will likely add some to the "sticky"....Tom

lance m p

I might be dying BUT I ain't giving up!

lance m p

One last thing on the 80lb/hr injectors is I was stumped on why I was leaning out up top? Well after realizing my error on the reg. I did a lil more digging on the GM injectors I have a 1990 SS454 trk w/TBI and it either has the reg duty inj@75lb/hr OR the heavy duty inj@85lbs/hr I'm not sure exactly which it has/ Even though I re-built the engine myself, anyway either or the 454 is 104cid [my 454 is 462 now] and its STRONG! if I would have made the mistake of buying a set of 80lbers whew! I'd a been drowning my 355cid in fuel. Just turn f/p/up or easy way stretch the reg. spring 3/4 inch-tested gives you 14-15psi. good luck.

lance m p

simplify things the 454 is 104cid more than the 350 and you definitly don't need 80lbers in a 350-355cid engine. My 454 pulls hard to about 5500-5700rpm w/stock injectors.

lance m p

I've had the good fortune of finding a real crossfire guru, very lucky, because ALOT of my information I've been hearing? has been from here-say, and not based on true facts. I'd throw his name out but he wants to stay anonymous, some of the things I was doing was right, however some not> for instance another heated debate the small [some say] TBI's on the crossfire being the biggest restriction>wrong the STOCK TB's on the crossfire will take you to the 6000rpm range [the biggest restriction is the intake] he supports all his claims w/numbers and facts then you can double ck yourself, he's been right every time. The man is a certified engine mechanic and is over 60 and has tested and tuned his crossfire [82] w/every modification, he tested it to see the results. I've seen his PORTED WHEW! stock intake wow to the limit! running stock/injectors stock TBI bore, near the 100mph range [no slicks] in the 1/4 he did go UP to the Renagade he claims[I believe] about a 20hp gain-however as stated thats above his PORTED to the MAX intake. so that being said the Renagade claim of what 40hp above stock is about right, alot of us don't have the correct tools or knowledge to get that max port-work. I myself went and bought the tools to get the thru the port done correctly. I can-not afford a Renagade. Just some more info for every one, I thought I would throw out there and share. btw he also has a very nice 71 454BB Mulsanne blue, a beast.

corvettenorway

do you have pics. of the porting ???? do you have tested the car on the dyno ???

lance m p

I've seen your port work ....very good I doubt his is much or any better. His stock intake's are so far out there I myself would'nt quite take it that far, he has a few of them [and a Renegade] and one he went through the bottom of the port and had to repair it. And as far as dyno results I'm not even going to go there. I've seen the mistakes others have made posting those #'s out there nothing but arguements. Its faked or this or that, nope won't do it. I've got to know him pretty good he aint on no B.S. I'll say this he's retired and does many experments...some successful..some not, and he's not afraid to tell you the mistakes..if made. The man has 3 different Vettes and nothing else.

lance m p

Is his quickest crossfire Vette does have the 51mm TB's however stock injectors, he claims all the 51mm TB's did on his engine was give it a lil better throttle response, and not much else, and that I believe because in my quest of getting the most out of the crossfire, others have also backed that up by saying don't waste your money unless you just want to spend it>on the 51mm for bragging rights only. Remember we are only talking about 350-355cid engines here. So maybe on a 383-400cid engine that might change?

lance m p

All the #'s thing, however here we go......>an ideal intake will have a combined runner & head port that is egual to or exceeds the volume of the cylinder. In a 350 you want a combined runner-head port of 44 cubic inches, the stock crossfire manifold runner has approx. 10 cubic inches & MOST stock head ports have about 8-10 cubic inches for about a combined volume of about 18-22 cubic inches-about 1/2 of what is desired for any performance work above 4000rpm's on a 350. The stock TBI's [combined] will flow 567cfm which is MORE than adequate for revs to 6000rpm's [oh yes it is] street engines blowing thru mufflers are only 80-85% volumetric efficency at best. A 350 running at 100% efficency will consume 608cfm at 6000rpm's-BUT your street engine is NOT 100% efficent so it will only consume about 486cfm at 6000rpm's and about 405cfm at 5000rpm's so the stock TBI's are MORE than enough for street engines. Back to the stock crossfire intake it will only provide maybe at best in stock form 425cfm thats why untouched stock crossfire engines fall on there face around 4200rpm's [again its not 100% efficent]so if you gain say 20% by porting the stock intake it will allow enough flow to get your 350cid engine in the 5200-5800rpm range.[depending on how well you port it and other variables like cam lift ,etc] However not many from what I've seen adequately port their stock ntakes-just port matching the exits you've only gained maybe 1 cubic inch. And I assumed? [never assume anything Lance]everybody porting there stock intake would realize by just looking at it? that-hey I just ported the exits and wait a min. those ports are tiny all the way thru. So you have to enlarge the entire port-inlet to exit. How I did it was using a slide rule and a piece of bent wire to gauge the ports all the way thru doing 2 ports at a time, [yes time consuming and a PITA] I'm $$ limited so I have to do things the hard way-meaning I do it myself my time cost me nothing-but time and I'm sure there are more high tech ways of doing this however when you don't have access to high dollar tools/machines the wire trick will suffice. I'm better at these #'s than cam specs all those overlap/dur/ramp speeds/lifts/DCR/etc...numbers give me a headache, I have a cam specialist for that, I'm not throwing this out there to sound like a expert because I'm not-I had to learn these things just like everybody else, so I'm not blowing my own horn just trying to help. I'm all open for any one to educate me more, just please be one with 1st hand knowlegde and not here-say, things have a tendency to get lost in rumorville now I have a headache

AGVI

Me too, please try using paragraphs...

lance m p

when I wrote it was paragraghed but when it got posted it wasn't??

Wrecked82

Best thing to do is type it in Word, then copy and paste. Also, preview before "officially" posting it.

Not complaining, just explaining.

lance m p

I don't use word to much anymore? did yrs ago.....sometimes I get frustrated w/easy things like that, and nope didn't take it as a complaint I realize reading that run on is.............like I suppose? an epileptic seizure? I'm laughing at me-self!

lance m p

I'm now using a 1995 dell latitude-610 lap-top [evil woman] X-wife took my nice pc & laptop w/A BUNCH of pics never to be seen again? I have up-graded the mother board and some of the software, not even sure I have word on here now? yep I'm struggling a lil on the pc thing. however it works for the most part?

lance m p

surely was covered at one time or another? For me I am only trying to omptimize the car and keep it realitiviley stock w/the original crossfire intact, if you want a HIGH-powered 82 corvette I seriously doubt [unless NOS] is introduced into the formula that you will get that high-power. I will get that 375hp at the crank, nothing more. That 375hp would equate to about 290-305hp maximum,at the drives, depending on the use of synthetic oil [which will give you another 10-15hp] over natural type oils-from engine to rear-end, And you can gain a little more by using electric fans, under-drive pulleys for your acc's. [evey little bit helps] And there is a limit to everything-I'm trying to reach that limit. I am very close to that now so there isn't much left to do to my now getting [kind of rare] '"original" C-3,1982 Vette. Many 82's are no longer original crossfires, because I'll agree squeezing 375hp out of a stock intaked 82 is not all that easy. I'm done on the engine, now off to other improvements on the car. Good luck and ...race on!