Yungcris09

Well I have a 89 camaro irocz 305 tpi and as of now its stock and I wanted to see what would be the best way to get 400-450 out of this engine any help would be great thanks

rdhanded2

iTrader: (3)

WAY too much money needed for that. Cheaper to build another engine. 305 is not the way to go.

Wadebryant

Add a 200 hp hit of happy gas.

Yungcris09

Yea I know I could so that but I wanted to see wat I can get out of this engine I would love to go to a ls1 but that is to costly

Orr89RocZ

iTrader: (20)

heads/cam intake and 100 shot should be close to 450.

Trickflow 175 small bore heads, with a decent cam, stealth ram or proflo xt EFI intake, well tuned should be north of 350 hp on motor. A similar modded 350 would put down near 350whp, so a 305 should be closer to 300whp I would think. Thats 350-375hp on motor. I never see anyone doin builds like that tho.


Or supercharge it with blower cam and some intake mods, or fab your own turbo kit...single t60-T70 should be near 400hp with enough boost.

freaky

i agree orr89rocz , heres a good start. use forged pistons an rods an the turbo like orr said an you should be there :
http://www.hioutput.com/tech/343hp/343hp.html

freaky

heres another build that got 325 add forged rods an pistons an a turbo an be in the 400's :

http://www.fl-thirdgen.org/325-305sbcbuildup.html

ZZ3Astro

All of that is going to cost more than an LS1 and he's already called that too costly.

Your only chance to do this for that tight of a budget is nitrous and a prayer, but even prayer isn't gonna make a stock 700r4 live behind the kind of torque you'll be making to get 400 hp.

The best route is sell your car, add as much cash as possible to what you get and find someone selling an Iroc that is already built. Always cheaper to buy hp that way than to build one. If you're lucky you'll find someone going through a divorce :-)

Yungcris09

I mean I aint on a super budget or nun but but I was sayin putting a ls1 in it is to costly because everybody around here wants to charge 6500-7000 for the engine and to put it in and convert it and ls1 stock is only good for about 300hp to start with so then I would be out of another couple thousands to get it to my 450hp mark

Orr89RocZ

iTrader: (20)

Actually an LS1 is around 350 through all factory stuff....put some headers on it and tune and its up around 400 on motor. All you need after that is a very mild cam.

LS1 should be few grand depending on condition. Low mileage stuff brings in more money

your cheapest best is a 4.8-6.0 liter motor from a truck...same thing basically but iron block. Swap intakes to an LS6 and tune it up.... all those motors are strong and cheap

Yungcris09

Now this last build u sent me freaky I lik that one and with heads, cam, intake, headers, and that makes 325hp thats a good starter

freaky

horsepower ain't cheap no matter how you do it . once you build the motor ,then you gotta up grade the rest of the drive train then you gotta upgrade the suspension to handle all the power or your just burnning up tires . so i guess buying sumthing already done would be the cheapest route .but if your like me win lose or draw i wanna be able to say i built that .all it's all what you want an how you wanna get there .. i posted sum threads for you to get an idea of what to do with a 305 like you said to begin with . good luck with whichever route you choose .

face215

305's not the way to go, seek a sbc 350 or sbc 400 either with 6 inch rods, or consider an LS swap, and by the way the tpi needs to be thrown in the trash!

blackbmagic

Stock assembled 350 block-375$
Pistons, Rods, Bearings-$700
883 Heads P&P, SSvalves and bigger springs- 350$
Mild-aggressive comp cam/valve train- 250$
Victor jr.- 175$
Used 650dp and proform main body-300$
Underdrive pulleys-150$

My setup good for 380fwhp. All for under 2k or less if you by more parts used, or find a block half built. Throw a 75-100 shot at it and it will spin you with no problem to 400whp.

freaky

sorry to bust your bubble but you got 2300 dollars worth of parts listed an your missing a few key componets there . like exhaust , carb , fuel pressure reg . a n2o kit plus the refills ain't cheap ...
hell if he's gonna change motors might as well go big block ....

blackbmagic

I was stating my build the one that is finished and in my car. I didn't say nitrous included for under 2k just engine, like mine without nitrous. Like I stated if more parts were bought used it can cost you under 2k.

I mentioned a carb kid.

FPR is not needed with a mechanical pump for this setup. Which is cheap. I did miss that one though.

Big blocks will easily cost you double for the same horsepower. finding a block and then parts are more expensive ect. If he was trying to accomplish 800-1000hp ok, but not for 400-450

Orr89RocZ

iTrader: (20)

450hp can be done on a 350 n/a but its gonna take more than 2500 bucks

Your gonna have 1500 in heads/cam alone. Bottom end atleast 1000. Not including the small parts or machine work. LS swap looks good at 2500-3000 bucks

freaky

bottom line is horsepower cost money ! i did over look the carb my mistake .lol
but you have the domino effect with building a 450 hp motor that tranny won't hold it then once you put one in that will the the stock rearend is gonna go bye-bye if you got traction . so if you want horsepower be prepared to spend alot of money .

Street Lethal

iTrader: (16)

Rebuild the engine so that it not only makes 250 horsepower naturally aspirated, but also so that it can handle the necessary 15 pounds of additional boost to get you to those numbers that you want. Then simply pick your power adder, turbo or supercharger....

Orr89RocZ

iTrader: (20)

Tranny can live for alittle while if your careful, and so can the rear. I still run my stock 4th gen rear and its been in the 9 second zone Its been 1.4x 60 foots with nitrous and turbo motors so they can hold some power in an automatic if the converter doesnt hit it too hard

Yungcris09

Yea know it will take some money and im not messed up about it I just wanted to see what that 305 ho thats in it could do and see can I get it to around 400hp or so I aint trying to race it all the time or be at the drag strip every weekend I just want a strong street car in case I wanna blow away a few mustangs every now and then

Yungcris09

Ok so what do u think guys should I go with a 350 tpi or a 350 lt1 what would be my best bet for the 400hp range im trying to get to tell me the goods and bads about both engines thanks

83 Crossfire TA

iTrader: (2)

You can make 450 with a 305, you just have to choose the right parts in a good combination. You'll need heads that will flow over 220cfm intake, matching cam with lift a little over that point with timing that will make peak power around 6700-7000rpm, matching intake and exhaust... That will put it right around 450hp at the crank.

It will cost you a few $ to build a small block that will hold together at 7000rpm.

You can go proportionately less with proportionately more cubes or with some boost or N2O or both.

If you think you're going to do it cheap then you're wrong.

Cheapest setup that will get you there is a 300hp small block (if what you have is in good enough shape then it's fine to start with) and a 150hp shot of spray...

Orr89RocZ

iTrader: (20)

bolt ons 305 + mild cam + spray. Thats easy enough

junkcltr

iTrader: (1)

The cheapest way to 400HP with that choice is the LT1. A bolt in with a cam & exhaust.
TPI needs head, intake, etc which exceeds the cost of an LT1.

83 Crossfire TA

iTrader: (2)

The fact is that they aren't as far away from that as you'd think. My '97 WS6 was factory rated at 315hp, and has run times very close to stock that work out to 366hp at the weight that it was at that night. The heads will support that power easily. There are people that have gotten LT1 cars into the 11's with a cam, exhaust, cold air and gears (and obviously programming)

86Z

iTrader: (4)

i push 380/420 to the wheels out of my 305 so do the math with a tremec and you'll get close or over that at the flywheel, if i had to do it over again i would do a 350. it was not cheap the 305 is not stock, and freaky said it best, once you hit that power level everything else will go...

Yungcris09

Aw ok so thats why wen I was lookin for it I couldnt find it but this is something I wanna know if I buy the bolt ons for the 305 tpi I have now lik heads, header, intake, manifoid, cam and stuff lik that wen I do find a l98 tpi 350 would those same parts for the 305 work fine for the 350

Orr89RocZ

iTrader: (20)

If you bought small valve heads like TFS 175's for small bore motors, you can use them on a 350 just fine but you may be limiting the motor's potential since 175cc is small for a hot 350 combo. most use 190-195's but its really a matter of cross sectional area than CC's. TFS 175's will support a good deal of power.

cam used in the 305 can be used in a 350 but it will act smaller in the larger cube motor. example, LT4 hotcam in a 305 is a pretty decent sized cam, but in a 350 that cam isnt that big at all. I kinda think of the hotcam in a 305 as comparable to a 230 deg cam in a 355.

Exhaust stuff will be all the same regardless of what motor you use. Same with intake stuff.

Yungcris09

Will I need bigget injector if I go with a hsr setup and will a procharger supercharger work with the hsr intake and manifold

Orr89RocZ

iTrader: (20)

If you cammed/heads the 305 for more power it may need more injector. 24 lb should cover anything a 305 on motor will make.

If you supercharged and didnt use an FMU, then you'd need larger injectors for sure. Any supercharger kit designed to work with TPI should fit any of the aftermarket intake setups that are designed to replace TPI like the HSR.

Yungcris09

and I been taking a good look at your turbo build orr89rocz and I was wondering wat u thought about a turbo build for my 305 and what do u think would be a good setup and how much it would cost me

Orr89RocZ

iTrader: (20)

To many variables to give a straight answer but a turbo on a stock motor can turn out well. ZZ3Astro made a nice kit for his L98 and its running well. Probably the easiest way to get 400hp next to doing a nitrous kit

freaky

orr do you think twin 50 trims with a 63 exhaust a/r on a 305 with vortec heads an a lt1 cam be to much ? all forged internals of course ...

Orr89RocZ

iTrader: (20)

Those a t3/T4 hybrid? The larger T3/T4 stuff should be a good match on a mild 305. I think most of those are in the low 50's mm size on the compressor wheel and that would be great for a 305.

freaky

yea there t3/t4's , i run one on my srt4 motor an it spooled ok {3200 rpm ). i figured since it was a 2.4 liter motor two of them on a 5.0 would be close to the same . would a 48 a/r be to small ya think . one on a srt4 is almost instant spool ...

Yungcris09

Wats a good brand to go with

Orr89RocZ

iTrader: (20)

.68 a/r should be good on a 305. I think .48 in a T3 frame is way to small but if considering a short rpm band like stock TPI 0-5000 rpm, it may be ok. Thats something you'd have to experiement with.

Most turbos are good brands. garrett, precision, borg warner/airwerks, turbonetics and mid grade stuff like master power, they all seem to do well. Depends on the budget. Some are getting good results with cheap ebay stuff. Single GT45 turbo is cheap and should make good power on a 305. MasterPower T70 is also very popular. 500-600whp capable.

Yungcris09

Ok sounds good imma take a look into that and wat about the tuning and ecm part of that wat is a good way to go with that i can do the install and fab work myself just tuning aint my thing

Orr89RocZ

iTrader: (20)

Its gonna be a fairly complicated setup to do twins on stock motor and definately not cheap. Definately do your research to understand the turbo stuff before diving into the project. Not to be discouraging, but its common to see people post here asking what size turbo because they are planning on doing a turbo setup but dont know much about it, and then either never complete the project or have horrible results. Generally if you cant size the turbos for the combination your building, you really shouldnt be doing a build yet.

For tuning the cheapest way is to get a 91-92 TPI ecm and reconfigure your wiring harness for speed density. 3 bar map sensor and run code $59 for boost. Works well once you get all the parameters adjusted right since it was for a Single turbo V6 let alone a twin turbo V8. Starting from scratch like that aint easy if you dont have some tuning experience and it does take time to get the program to work well enough for a big V8.

regal301

5.3 or 6.0 truck motor swap,any other way would be foolish.a cam and tune and a few other bolt-ons and they make that power all day. (cheapest way out)

305=boat anchor.

horsepower costs money,no money,no horsepower.

Yungcris09

So what all trucks came with the ls1 in them

regal301

not the ls1, but a cast iron block version in different sizes. they are a lot cheaper.

Yungcris09

Ok so if I did get a hold to a 6.0 ls truck engine can I still use my tpi on it and what about the ecm what would I need to do about that

regal301

forget the tuned port setup,you will use the sfi on the ls motor.
your 305 and tuned port intake wont get you the power you want on a budget.

Yungcris09

Those ls truck engine is about the same price of a ls1 there both about 3000

regal301

i can get the 5.3 truck motors all day for $575 with a 90 day warranty(LKQ) and with high miles as low as $300

budget build ........... junkyard

http://car-part.com/

Orr89RocZ

iTrader: (20)

Yeah if your finding them for 3K then your not lookin in the right areas.. even some higher mileage LS1's are well under 2K in some areas but the truck 4.8 and 5.3's are dirt cheap.

Heck, a 4.8 with a 224 cam and LS1 intake on top will make enough power to scoot low 12's without much effort. Not bad for a 293" motor

Convoy25

iTrader: (3)

Not at all, trucks came with 5.3L and 6.0L

again not at all, 5.3Ls are a dime a dozen with the 6.0L close behind. you can find complete engines for fairly cheap. easy bolt on power + decent gas mileage.


** as mentioned above me dont rule out 4.8L they the same block as a 5.3L. get LS1(5.7L) crank and pistons and on that 4.8L and you'll have a 5.3L.



http://www.ls1tech.com/forums/conver...de-1500-a.html

Yungcris09

Fair as the 4.8ls and the 5.3ls how do I need to go about the wiring harness, ecm and fuel injection which ones do I need to get up