88l98

I've got an '88 iroc l98 350 tpi and im preparing to start a performance build. My goal is to get 100hp/liter (570 hp) out of the motor, preferably to the wheels. Does anyone know if this is a plausible goal using the block that is in my car or will a power level that high put me at serious risk of doing damage to the engine. I intend to drive this on the street as well as the track and just wondered if the l98 was strong enough to handle the power/abuse. Any/all input on this is greatly appreciated.

mxthreat

honestly man i dont know . lots of people will tell you to ditch the tpi in favorof a caburator or try a mini ram because the stock tpi wont run above 5000. and also in order to make any kind of power from that intake you will need to upgrade the runners and the base and port the plenum to flow more air. now whether the block will handle the power. if you build it with top qaulity parts the block could handle that. but you might not have a daily driver. jst wanted to drop my two cents in because im building a 383 and using the tpi setup but just ugrading it all to flow better, its been a little more expensive than say swapping in a carburaor and manifold which i cant do here in vegas because of smog laws. i think you might wanna just try and shoot for maybe 400 hp to be safe and still have your car a daily driver unless you wanna build a full out race car then go for it

LMSkyliner

iTrader: (1)

The block itself should be fine.


now then. the goal is the question here. On stock TPI, you will not get 570HP. at the wheels or not. I will tell you that now. Even sprayed up and down or running huge boost, it'd take serious work.

Which leads me to the question, NA or forced injection??


if NA, i say your only bet is the FIRST system, which is basically still TPI. As far as my opinion goes (not far) its the only TPI-based system which has a chance at pulling those kinds of numbers, and even then it'll require serious know-how and $$$$$$$$$$.



Oh and i don't think youll make 570 out of a NA 5.7 on TPI and street gas, no matter what system it is. a 383 or 400 would still be pushing it....





maybe what im trying to say is that forced injection is your best bet?


im not very helpful today....
~LMSkyliner

mxthreat

yeah i agree thts probally the only way to make that kinda power and use the tpi but that gets way pricey then your back to it being a daily driver and reliable

1991CamaroRslow

iTrader: (3)

It's doable but it will take forced induction and a serious tune plus a very sturdy build. Is there any reason you want to get that much power from it? This isn't some "Honda gets 200hp from a 2.0 liter" thing is it?

bjankuski

There is no way this would be a streetable combination unless it was a forced induction set-up. To get 570 HP to the wheels would take more then 675 HP at the crank and to make that kind of power it would be a full race set-up in N/A form.

jerryd87

iTrader: (2)

wasnt there an artical somewhere on a tpi shootout where they where making like 420hp at the motor with a stock setup and almost 500 at the motor with aftermarket base, runners and tb? just remember hearing about it

88l98

Thanks for the info. Ijust planned to keep the block. Everything else would be upgraded/replaced i just wanted to keep it tpi style, not my stock tpi. I had a pretty good feeling that the stock tpi system couldn't handle that power. I drive the car currently and hope to start the build this year/summer. Itll probably be fairly long term due to being expensive and that i want to do it right. I am open to forced induction. I actually would like to run an roots or twin screw style supercharger on it. I was just worried about the blocks ability to stand up to it. if anyone has any good ideas on a good blower to run, that would be greatly appreciated too. thanks again.

pandin

Strip everything off the engine, water pump, oil pump, mufflers, air cleaner, ect... Put it on a test stand dyno and you might get those 500 + numbers for a little while. Or are you wanting 200,000 miles too.

What most people don't get is that peak HP can be made for a very short time, look at your 6 sec machines. The big challenge is long term HP. The closest to this is the new factory super charged vette, what 427 and 800 HP. It is "Streetable" too. Ever wonder why the new vettes come with traction control?

Get out your check book and have fun. Just go buy one and install it in what ever you want the run. Oh did I mention that the car has to be up to the 800 HP too. Or all you get is a big box of broken parts.

The dreams and reality seem to be so far apart, with the check never being big enough.

Guest

You're going to either need a LOT of cubic inches or plenty of pressurized (or chemically altered) air to get a TPI to that number. I'm not even going to try to find his last RWHP number but IIRC it was in the 650 range, on a junkyard block... so its possible sure, but you have to also ask yourself how is your luck?
http://www.theturboforums.com/smf/in...?topic=61219.0

I think 450 or so at the crank is a much more realistic request.

88l98

thanks for the info. Yes, I know that peak hp is made for a very short period of time. 570 hp is just a ball-park figure i would be ideally be shooting for in a build-up. I guess the real truth will come when I take the block to a shop to see how far i can really take it when i'm ready for the machine work, blueprinting, etc. I once asked a question similar to this to my former power and performance instructor and he told me that going beyond around 550 would put me at risk for breaking stuff, becoming unreliable. I'll just have to wait and see i guess. thanks again for the input.

karl's-92'-z28

iTrader: (5)

It also depends on what your gonna use the car for. With that much hoses Im thinking strip, occasionally street use?

88l98

Thanks for all the replies. 570 bhp/whp per liter wasn't a honda thing, just a rather extreme (gee would'nt that be nice) ballpark figure. Although that may be out of my reach, I found that 500 or so hp and 500+ torque might not be too un-attainable. For instance, I found an older super chevy article at www.superchey.com where an l98 tpi (although possibly from a vette) w/ stock but ported heads, mild cam and tpi injection made about 460 hp/540 lb/ft of torque. While they did made it a 383 stroker, it was the same block and kept the tuned port set-up. I am looking to still drive on the street. With a slightly more fortified set-up, I would think/hope that slightly higher out-put would be able to be had. Once again, this is all just ballbark to shoot for in the build and any insight is always greatly appreciated.

kovizzy3

i know that this is not exactly at all about this post but i just joined this site and registered and have no idea how to post something. I have a 87 l98 motor that i am wanting to turn into a 383 tpi. i have a differtent tpi system for the motor it is a accel super ram set up. i just need some help figuring out what stroker kit would work best and what cam and stuff like that if anyone could help me out or even send me some info or post it i would highly appreciate it. and also if you could tell me how to post something that would be useful. thanks joe