Im trying to find out how much hp im getting from my engine with the current mods( se below) . Is there any program to calculate this?

 

I think desktop dyno is one of the more prominent ones out there, but most calculating programs don't factor in "small" mods like a TB bypass or an airfoil, they only work based on head, cam, and bottom end combos, and induction type if you have the file. The only real way to tell if you have an improvement is to get the car on the dyno or take it to the track.

 

Ok thanks, the problem is i have to travel a long way to get my car dynoed. So anybody got a *** guess , how much HP ive got?

 

welll.. if these are your only mods:

1988 Camaro Iroc-Z28
305 tpi THM 700-r4
Flowtech Hedders, Thermotec wrap
3 Inch exhaust
No cat
K&N filter
Trottlebody coolant bypass
Autospeciality Power stop rotors
BBK adj fuel pressure reg. 50 psi pressure
JET Airfoil
Ported and polished plenum and runners


im going to guess...... not much higher then stock.perhaps +10hp or so... a lil more TQ down low from the exhaust... thats about it.


you havent really done anything to ADD horsepower... you've just changed things that take away power to take away less..... IE, less restrictions...

 

By definition removing horsepower limiting parts on his engine he has effectively added power. The factory HP rating is on a factory engine, i.e. as delivered. If that is rated at 210 HP then changing exhaust manifolds for headers should see an increase in power. I repeat an increase.

In total I would estimate 20-30 HP minimum with the bulk of that coming from exhaust work. I saw over 30 HP increase from just removing my cat and installing a 3" catback.

That being said the only way to accurately measure power is at the track or dyno, or if you happen to have a MAF car then you can gather datalogs from the ALDL port and monitor your MAF rate. I have done that since the start of my cars progression and have pretty much shown that X amount MAF rate is eqaul to Y HP. In my case it is roughly .75 MAF = 1 HP.

 

I dont really understand this , if i have less restrictions then shouldnt i gain horsepower from that?
I think the hedders and 3 inch exhaust all the way from the engine and a gutted cat should give more than just 10 hp.
I would guess maybe 30 hp with all the mods but thats just a guess from me.

 

ummm, yea you gain HP that you see at the wheels that you were using...

perhaps im being too **** with terms... in anycase, yes you have more power, but no, you havent done anything that will gain you a huge increase.

 

I would guess about 30 also from headers, exhaust, a little porting, free flowing air filter. 10 HP is just way to conservative. The other thing you have to keep in mind is if its a high mileage engine you will probably have lost a few over stock #s due to wear, compression etc.

 

30hp gain sounds about right

 

thats why i said 10hp over stock...... if it was a new motor, i would gues around 20.... but things wear.....

i think 30 is a lil high....

 

The guy has headers with a full 3" exhaust and no cats that alone should be 20 over stock manifolds and exhaust. the other 10 is just a guess of course not knowing what kind of port work was done, plus his K&N, air foil, TB bypass, and AFPR.

I am pretty sure with a complete exhaust + headers most people are seeing at least 20 from this alone.

 

most of the gain you feel is from TQ, not HP.... but its pointless to argue...


he needs to save up the $50 and do a few dyno runs on it

 

I am quoting myself....

I saw a 30+HP increase from removing cat and catback....mind you on a 350, but that's all there was done.

Mind you my cat was high mileage so maybe, just maybe that was robbing a little power, but not really because from dead stock to no cat I went from 90MPH to 92 in the 1/4 then to 96 with the catback...there was some chip tuning involved as well, but on a stock chip with not cat and catback I went 93+ mph vs. 90 previous to that.

 

Good deal the shop I go to its $100 for a before and after run.

 

Use the Home Dyno program.....I haven't had a chance but it looks like a smart, simple idea. May not be incredibly accurate but the physics behind it are right. They claim its within like 5% accurate, which may or may not be true, but something neat to try anyway. Some other guy is developing a similar program for free at http://members.fortunecity.com/jasoncuadra/id47.htm

Try it out and tell me how it goes!

 

The car has only like 50k on it so it shouldnt matter too much.
A dyno test cost at least 200 dollars here if youre lucky so thats why im asking.