Some dude told me that "You would be legend if you could get 400 hp out of a TPI".

C'mon now that sounded like he was dissing TPI!!

YOU CAN MAKE 400 HP WITH A TPI. tell me I am right! and he is wrong!

 

Not a stock tpi unit naturally aspirated.

 

well yes of course not a stock one.

 

Very very difficult to achieve. 400 RWHP, I dont think so, but 400HP at the flywheel, yes, it can be done.

 

I would say that you can get really close if you use the right parts. Look at buckeyeroc. He has tpi with accell superram, afr 190's, zz3 cam (i think) ...runs 12.3's. I too have a similar combo...AFR states that with a very mild..close to stock cam and the afr 190's you can get almost 430 at the flywheel. Its just a matter of getting the hp at the right rpm's. The stock tpi intake limits us to about 5500 rpm's max. Super ram, or mini ram, lt one intake conversion, the rpm's go up. It is definately possible!

 

I'm a newbie to the board, but I know some stuff.
There is no way in hell that you can get 400 rwhp out of a stock-intake (even ported manifold, plenum, runners).

With aftermarket mods (eg. super ram, mini-ram) and some head/cam selections, I know that you could go to 400hp.

 

Any budget?

Hmm.....I'll bench race for a minute.

426 stroker SBC, 6" rods, some good flowing big chamber alum heads, Stealth Ram , bigger TB, better injectors, big tube headers, big solid roller to let the motor rev with a solid valvetrain to boot.......I digress...


What's the conditions?

Mike Davis is putting almost 350 HP to the REAR WHEELS with a ZZ4 shortblock, Lt4 Hot Cam, AFR heads, and a Stealth Ram. That can be misleading since it runs 11's


Enough to surprise ALOT of LS1 cars......


It's all perception. Personally, I'd rather build a 350 HP , 11 second car than just a 400 HP car


Later

 

I think buckeyeroc's is a 350 punched .030 over like mine. Do a search, he has a video that shows it run the .25 in 12.3 Aint no bech raceing about it.....facts!

 

http://www.netgearhead.org/iroc/

 

Thats one heck of a launch in those vids. Must be the tires and suspension mods he's done. Absolutely no wheel spin there.

 

YEA! I'm worried about my rear end! I have almost the same mods except i have a zz3 cam, not much different than his and I have the stock intake ported out ofcourse plus the slp runners and a supercharger. I wont even dare put slicks on! That thing sounds awsome! makes me want to gut my cat!

 

400hp thats easy

 

Ansel was talking of 400hp NA. By the way, what kind of car is that? It looks like a v8 in some sort of mid engine body such as a Ferio?

 

Exactly. Alot more goes into a fast car than just the engine and how much it's putting out. Forget about just being able to say "Yeah it has 400HP." Focus on the 1/4 Mile time and whatever it takes to get there as a whole. Running a 12 or whatever will be a much more impressive thing to say.

 

yup fiero

 

So were you the one who had the broken transmission due to teh amt of torque? Bet that thing hauls! Esp. because of the power to weight ratio!

 

Raiden,

I was present at a dyno pull when a guy with similar mods as you posted above (except ZZ9 cam from TPIS), pulled a max 310RWHP. But more important, he pull 300 or more from 4,000RPM up to 6,000RPM!!!! It was very impressive.

So at the flywheel, the engine may be making 387Hp.

This car runs 12.3sec at Norwalk, Ohio. This car justs rockets away on the green, the car will beat just about any other NA car at the 1/8 mile mark. The car is a L98 '89 IROCZ.

But if the leading ? restricts the engine to stock displacement and stock TPI, there is no way the engine would ever make 400Hp at the flywheel. IMHO, of coarse.

 

I think that he is talking about the intake system and block only. You could get close, but it will choke it out at high end. There wouldn't be a point of 400hp LTR tpi. You can get upwards of 3**hp, but I haven't seen any touch the 4**s.

 

check out AFR's website. forgot that it was a tpi issue I ported the plentum, runners and base too....pluss, i have 8.5lbs of boost to add to my combo

 

http://vette383.tripod.com/

 

Let's not forget he said TEE PEE EYE ! Any fool can get 400 HP with a big inch SBC and a stealth/mini ram.

 

It is pretty hard to get 400RWHP out of a LTR set up w/o going with a monster stroker motor.

Now, 400RWTQ is extremely easy!!!
Just see my sig. I am on my way....

 

You were wrong and he was right.

 

According to the Lingenfelter book, "on modifying small block chevy engines" you can make a number of SBC TPI, EFI combos over 400HP.

1. 383cid, 440hp, superram, 58mm tb, 1 3/4" headers, LPE219 cam, , aluminum vett heads, and bunch of performance pistons, rods, etc

2. 420cid, 525HP, superram, 58mm, 1 7/8" headers, AFT 190 heads, big comp cam, Accel/DFI ECM and a bunch of other stuff

This is the guy who built a 355cid SBC to 1400hp in a firebird, with twin turbos and went 298 mph on the Bonneville salt flats!!!!!!!!!!!
That's cool

 

My combo should be VERY close to putting 400hp to the ground. I have more PROM tuning to do, but I'm confident it will run high 11's naturally aspirated when I'm through tuning and tweaking the car. I should be able to dyno the car in a few weeks, so I'll have some numbers to back it up, but the answer is yes, it's really easy to make 400hp + at the flywheel with a TPI setup.

Mike (1bad91Z)

 

1bad91Z, can you give me some more details on your vortec heads? I looking to get around 350-375 HP from my car with vortec heads. SDPC base, Hot Cam(maybe). Can you give me some advice or what to stay away from. My motor has about 8K miles on it. I really wanna stay away from pulling it to bore it and put new pistons in it.

 

I was waiting for someone to say this. To me TPI has little resemblance to the aftermarket systems offered by Holley and Accel.

 

see sig... for all of u who say 400RWHP isnt possible with TPI better start re-thinking. and these dyno #'s are with my 26# injectors and i was lean the whole time. i got my svo 30's in and i can honestly feel a huge difference in power.. so im thinking/hoping for 415rwhp and 450 rwtq.

 

My thoughts are that the torque developed by a TPI engine regardless if it is a stock-ported or aftermarket plentum, runners and manifold is a much welcomed plus when it comes to street quickness. Pushing the Torque up into the horsepower range gives maximum efficiency and developes horsepower where it's needed the most or increaes the Volumetric Efficiency. 400 fts of torque in a 350 hp engine seperated in the rpm band by what is idle speed is what I am talking about and is what's listed below. If you can keep the tires from sizzle'n off the rims they gotta catch you first. That's street only and that's where most people drive most of the time. But if your gonna make a pass and want to run high RPM's you push the torque to rpm ratio's farther apart and throw the efficiency out of wack. You'll no doubt run a TPI engine down when you build the Horsepower up the TPI's already found in the quarter but on the street it would be a diffrent story. I think people should really think about that.

Dyno = Superflow 901

Dyno Results of a Modified 350 TPI with TPI's manifold, ported 492 heads ( how much not sure ), 10.1 compression, stock throttle body, TPIS cam (228.236 @ .50 with .490/.510 lift runs out at

Max horsepower 356@4750 RPM
Max Torque 420 Lbs-ft@4250 RPM

That's not mine BTW... This is mine

 

well, I know you guys are pretty cut throat about people estimating there HP output....but I am STILL going to say that with my LTR set-up I will be making a conservative 390 at the wheels. I am working on a write up with pics, etc etc and will hopefully have all that together within the next couple weeks along with dyno #'s. I will say that I have extensive flow bench and cylinder head knowledge. I do this for a living. This is not a slap parts together L98, it has been engineered from every aspect to reach this goal. Some of the parts used are SLP runners with MAJOR modifications and porting, A Comp Cam extreme energy roller, and believe it or not...Vortec heads and the SDPC base. Again, EXTENSIVE modification to the heads, base, etc have been done. Very sneaky and very stealth.....anyway I was too anxious and proud to hold off until I had the write up but, just keep your eyes open in the next couple weeks. IT CAN BE DONE....I PROMISE YOU THAT!

 

hey 90Formula-X-F jus wondering but the runners in ur picture what brand or type r they, their pretty sweet lookin, they almost look carbon fiber??

 

chevyboy07 91, what kind of work was done to the heads and runners. I wanna get a package put together to beat LS1's and Im thinking of vortec heads, SDPC intake,slp runners, and Cam,( not sure which one),aybe hot cam for its price), and TB

I want torque mostly siince I do all my driving on the street and never go to the track. what cam do you use and recommend and what are the specs. Can you give me any advice on what parts to put togehter and which ones to stay away from. also check my sig for mods I already have.

 

well its not N/A and its a 305.... but... with 12 pounds of boost.. 400 hp easy.

 

Saturn,

DAMN! That is a very cool TPI setup!!

 

OK, that's just silly...

I saw your sig before, but I never imagined what it would actually look like...

Man, that's just so awesome.

:hail:

 

Hey all. I'm working on the same type of thing on one of my project motors. It will be a primarily street motor, but with the occasional trip to the track. I was thinking just supercharging it...? That way you get to keep at least somewhat reasonable fuel mileage on the street and on trips, but with the option to really open it up when you want to...?