89IrocZ350TPI

I have this annoying friend who must have a faster car than me. He wants to know what mods he has to get in order to beat me. He has a 91 lb9, 5 speed. I believe its 230 hp. His best time was 15.0@95. My car is a 6 speed ls1 with exhaust and lid. I told him to either do an engine swap or forced introduction. What do you think? Would it be worth it to build up a 305?

hedberg667

No, The money that he would have to sink in just is not worth the HP output. Plus i don't know of any modded 305 that beat an ls1. He would be better off doing an engine swap. i know swapping a motor seems intimidating but in a cost to speed perspective its not worth spending money trying to build off a motor that's not a good base to begin with. Im not saying the 305 is crap, it just wont beat an ls1

89IrocZ350TPI

ls1 powered third gen is prob the best bet then.

tpivette89

jeez, your friend needs the driver mod! with a trap speed of 95mph, he could be hitting around a 14.3, not the pathetic 15.0 he did

however, a friend of mine had a 85' LB9 Trans Am. with just some free mods, a catback, and a 125 shot, he went 13.1 at 103mph. off the bottle he ran 14.9 at 91mph. nitrous really seems to wake up the TPI motors when used at the right time (just after the 60ft)

if your friend could learn how to drive that 5 speed, and added a decent shot of nitrous, its highly likely he could match or beat your high 12 sec LS1. how long his tranny and rear would hold up to the power levels id take to beat you, however, is another story

89IrocZ350TPI

I could be wrong but I think his car was rated around 14.9 at 93. All he has is exhaust so it looks about right I guess.

tpivette89

it should only take about 90mph or so to hit 15.0. a trap speed of 95mph indicates hes either spinning or bogging bad off the line

//<86TA>\\

iTrader: (14)

there are a couple 305's here that will kill an ls1 car.

however, a lsx swap is the way to go.

Camaro Spectre

Doing a regular 350 swap with bolt ons and a nice shot of juice would probably be enough to give the Ls1 a run, that with some gears he could possibly take the Ls1. However the driver mod would play a big part in that and how well he can hook.

Would be cheaper and less of a headache then say doing the LSx swap into a thirdgen IMO, but an LSx has loads of untouched potential which is why I have one.

zraffz

My 305 in my iroc would spank a stock ls1. Best run on motor was a 13.8? and best on juice was a 12.7? Needless to say I never retarded the timing or had changed out the cast bottom end and it didn't last very long.
I actually started pulling the motor out today and I feel bad for the cylinder walls. I'll get pictures when I take the heads off and the pistons out, but the spark plugs were all covered in oil (massive blow by, it had less then half a quart of oil in the motor). The fifth cylinder's spark plug looked like somebody dunked it in tar.

Lesson learned:
I had some chick I was hanging out with in the car, and some guy on a bike kept flying up on my *** so I decided to flick the nitrous switch, never purged and never warmed up the bottle, and when I downshifted and mashed the gas the WOT switch got stuck open... (I already had slight blow by but nothing horrible) needless to say it was followed by a loud bang and a giant smoke cloud the rest of the way home; 8 psi of oil, and a top speed of roughly 30 mph. My pride was worth more then my motor I guess and to this day I don't regret it at all.

89IrocZ350TPI

[QUOTE=zraffz;4292071]My 305 in my iroc would spank a stock ls1. Best run on motor was a 13.8? and best on juice was a 12.7? Needless to say I never retarded the timing or had changed out the cast bottom end and it didn't last very long.QUOTE]

Ive seen a few stock ls1 cars hit high 12's stock. I hit 12.8 with just lid and exhaust and im not even that good of a driver lol. From a roll they are even more wicked. After 100 they pull very hard.

tpivette89

we all know that a handful of bone stock LS1 fbodies have gone high 12s with great drivers in ideal track conditions. however, the other 95% of 98-02 fbodies have not. and this thread isnt about that 5% who have, or going from a 100mph roll... were talking about your car with you driving, at the dragstrip. you went high 12s, so thats what your friend has to beat

89IrocZ350TPI

I was just saying a car running 12.7 isnt going to "spank" an ls1. Thats all. It may edge it out, but thats it. Plus if you run into an ls1, chances are its not stock.


On another note I think procharger has a kit for 305tpi that would proably level the playing feild with the supporting mods.

RS Reaper

A supercharger may work and it would be easier for someone that doesn't have huge automotive knowledge. I would say a dual turbo would be his best bet. It would be cheaper and if he knows how to do it right could be better then the supercharger. Over all whatever he does to his you could beat with very little money, mostlikly. Not to be harsh but I'm guessing your like high school or early college age, so I don't see where he will get the money to waste on it.

As he had to ask you what mods to do to beat your car, he sounds like he knows nothing about cars, so I'd say no it's not worth it to build it up. Cause he will just be another guy out there with no idea what his engine power is and contently wasting money on something he truthfully doesn't care about, only to get let down by the cars with some real HP under the hood.

zraffz

Half a second in my eyes is getting spanked. It's not likely a bone stock ls1 will see anything better then a 13.2+

He could always just change his crank, rods, and pistons and try his luck with nitrous.

89IrocZ350TPI

Fine then we will race from a roll!! Yeah 13.2 is good for a stockish ls1.

bmfIROC-Z

iTrader: (1)

i say lt1 swap,cheaper and easier than an lsx swap,and with some bolt ons and maybe some suspension work he would give ya a damn good run if not beat ya if he can drive.

406z

I've seen a stock 305 run a 9.4 on an 1/8th thtas better than a lot of manual driving ls1 guys. lol But, that's because the guy with the 5 speed was a better shifter than most manual drivers.

lt1+NItrous

StevenB L98/LS1

Not worth it, he might as well just get an lt1 swap, and mod the motor out that way with spray, which i would never really ever suggest. But my car had a wet shot of nitrous on the tpi 350 that the previous owner ran with a chip, and the car was a rocket, so maybe if he did a heads, cam, tuned computer, port intake base, larger runners with nitrious he is gonna literally smoke you. But i only see the investment into the motor only if he adds the nitrious, because the motor alone isnt gonna beat ur ls1 motor to motor, also he would need to do an injector upgrade. If he kept the nitrious he is gonna need a good built tranny to handle the power, and thats not something i would recommend using his t-5 knowing the limit of torque it can only handle 300 lbs of torque, unless he got a world class built 5 speed.

bmfIROC-Z

iTrader: (1)

not worth it???i've beat a couple full bolt on ls1's with my lt1 and mods in sig.(all motor,no nitrous)

tpivette89

i think he was saying it wasnt worth it to build up the 305, not the LT1

StevenB L98/LS1

Yes its worth the investiment in the lt1 was what i was trying to say. I was not recommending adding nitrious to the lt1, if he was doing a build motor to motor. tpi 305 not worth the headache.