that's true on the exhaust. I would run just header mufflers for the fun of it ( small town, back road running, etc ). Sounded pretty cool at higher rpm's, but i could notice the low end punch would be better when I'd put back on the full exhaust. Free-er flowing is a good thing but there should be some backpressure in the system. We would make sure the header tubes & exhaust sizing all worked together.

 

2.25'' piping is perfect for n/a builds, 2.5'' piping is perfect for f/i builds, 3.0'' is larger than you want to go for a 2.4l on any build. Its do able, but you will lose mostly wtq. Which, 191wtq is not bad at all for the tC. 3.0''+ you will loose a good amount of wtq and whp.

Thats as a general rule, you wouldn't want to run 3'' piping unless your 2az is completely built up from side to side, bottom to top and even then its questionable.

 

my point exactly

 

i just want to hand out some props to you younger guys out there. Too many times people my age end up pre-judging your age group; and don't ever return any respect. There is a good amount of car knowledge being used on this site, it shows in your posts & in your cars. At your age, I had a 70 1/2 Camaro that I worked on constently to make as fast as I could afford to. But vehicles were easier back then; less tech details to worry about. Now you are getting 2-300 hp out of engines that at one time were designed for reliability/economy. And in some cases ( like the older Honda hatches ) there is engine swapping, etc being done just like the old days. I just wish we had the web like you do--man this is great to be able to exchange ideas across the country in a moment's time.
Well, for what it's worth you guys have my respect.. keep up the solid work.

 

fyi, you sig says you have 2241hp. not disappointing at all if you ask me

 

I have to agree.. the numbers are lower than i would of wanted too. There is just no torque with this SC... i hate that.. Turbo is looking better and better.. now how to get rid of this supercharger is the real question haha.

 

I totally agree. Back in the day it was a set of headers, a manual distributor, carburators, having the heads reworked and tossing a cam in, all on a big block and still only making 250hp. Now 4cyl engines pound out over 300hp with a few mods. I still can't stand popping my hood and looking at all the electronics. Chips, pulleys, NOS, and re-tuning. Good job guys!

 

I Think the #'s are pretty decent for what mods you have. Now get that thing to the track and see what time you can squeez out of it ;)

 

Looks like your belt started to slip at 4800 rpm on that run and again up high on that run for a split second. Might be why you only saw the hp you did and 8 psi.

 

i would have to disagree with some of you about 3" being too big. the supercharger is designed for top end power, im willing to sacrafice 2-3 lbs of torque to gain some top end power with better air flow, but hey everyone is titled to their opinions.

desertheat- how would i be able to tell by driving the car that the belt was slipping, im very interested in this matter and how i might fix it if there is a problem

I agree that with some tuning the numbers would be a lot better, also with some form of cooling agent as well, ie intercooler. im not dissapointed in the numbers themselves, im dissapointed in not seeing the numbers ZPI claimed it would put out, maybe someone from there end might have some input.

Thanks for the comments

 

Those numbers arent bad at all, but I dont know if you are having any slipping or what, cause your dyno is very steady to redline besides that last little hump.... Do you have the stock air box in? If so I wouldnt be surprised if that is why you are thinking your numbers are a lil low... Think about it, you cant force any more air in that cant get through the airbox...
I am hitting 227hp-197ft-lbs before I did the header.... You have all of the mods that I have, besides the intake and 3" exhaust...

 

i have the umnitza intake but i think that does about as much as the stock airbox would, looks pretty though haha. after doing the s-pipe i wouldnt be surprised if my missing power isnt from the 3 inch exhaust.

But its like i said and what i still cant figure out is why i only got 13hp from the pulley when ZPI claims 21 on the stock exhaust, seems kinda funny to me but oh well life moves on

 

ZPI = 9psi

NST = 9.5psi


Wasn't that claimed 21hp verified by someone other than ZPI? I believed someone else dynoed that increase. Honestly, I think it's your 3" piping. It's to large IMO.

 

The stock belt sucks...when you put a pulley on, its absolute garbage...look on your engine block right behind your pulley...you see any black dust?? Replace the belt with the part number that I supplied on my NST pulley thread and that will answer your problems...You can thank Munch for that one

 

I gained about 19hp from the ZPI Pulley.. I went from 208hp with Intake and 3" exhaust to 227 hp with Intake, Exhaust, Bosch BPV and ZPI Pulley....

 

It is not a claim, it is a fact of physics. Somthing happened were you only hit 8 psi. that 1 psi is worth about 10whp which is why you only saw a 13hp gain! RIght at 4800 looks to me like your belt started to slip like I said, then on in the rpm range before redline she really slipped for a second. Just my 2 cents.

 

I concur! Mine was a '56 Chevy 2 DHT. When we wanted a lowered front end - we just heated the springs!

 

That would be me. Dyno'd 195 before the pulley. 217 after. Swapped it out while it was strapped to the dyno. No other mods, stock airbox, spipe, header, exhaust. That why i thought with a header, intake, spipe and muffler he should of saw more than what he got. I'd suspect some belt slippage too maybe?

 

wow

i personally like the linear increase in power, just because i know its safe on the engine.

the flat line of torque looks awesome too.

Good job!

 

Wow I thought you would pull in a bit better for the mods. Nothing stratospheric but I mean at least 235 hp and over 200 tq. My car has the TRD supercharger, ZPI pulley, Crank Pulley, DC Header and Custom Intake and I netted 225 hp and 195 tq. I recently added the Forge 007 BPV a ZPI s-pipe. Wondering what that will put me at when I go to the dyno.

I'm not trying to rain on your parade regardless, the wheel horsepower is still awesome considering the TC dynos at 139 whp and 136 tq stock. So its good to know you have one of the faster tC's on the road.