i dont know what kind of dyno it was,but there where several other forum members there,jerk racer pulled 330hp[or so] on his t2 and another guy had a n/a and pulled 140-150[i wasnt there for that one,thou]

 

The S5 intake has better flow than the S4. Reason he still had the S4 is because it was a S4 car and I guess he did not feel like changing it.

 

sure the timing is on? Maybe even change the tranny and diff fluid (that has almost no chance of giving you better hp, but you should do it anyway). There are three main factors that will affect the hp: spark timing, fuel percentage, and compression. Check and/or correct all three and you should be good.
Even turbo rotors wouldn't give you that kind of hp. A compression ratio difference of .7 or so will not give you 30-40 less hp.

 

it was a dynojet. how do dyno's differ?

 

Like I said, mustang dyno's read lower than dynojets. They are just a different way of mesuring hp/tq. They are more accurate though. The best thing a Mustang dyno is for, is to run a baseline, and then go back to the same dyno after mods and find out your gains. It's hard to compare them to a dynojet, cause it seems not many know the exact difference % wise they are off. When I did mine, I pretty much doubled the drivetrain loss, and it gave me an appropriate number that I should've gotten on a dynojet, but I never ran it on a dynojet to find out.

 

I did a mustang dyno run on my S4 N/A. at 6000 I pulled a 130.

 

Hmmm.....sounds like everything is there to make 150-160rwhp. The a/f ratio is'nt perfect, but it still should make more power. Perhaps you do have low compression rotors?

As I've stated a million times: I made 167rwhp on a mustang dyno with my n/a. Basic mods are dual 2" exaust (RB parts), mildy ported motor, s-afc, and a ported intake.

Something is off for shure. Do a compression check, change the plugs, fuel filter, and maybe wires.

CJ

 

you must know how your car feels! If you have porting you need more fuel otherwise it all don't make sense and it can actually slow you down! I dont see anywhere in your sig that you have any fuel mod. YOU HAVE ZERO FUEL MODS. You want to produce 190 HP to the wheels. Thats 80 HP more than stock. For this you need much more fuel. There is NO WAY that you gonna produce 80 HP over stock HP with stock fuel system!

Dont trip but I just want to point something out:


rebuilt motor - no HP gain unless more flow -> more fuel
t2 intermidiate housing - no HP gain
S5 rotors/rotating assembly - are your rotors NA ore TII, if NA, HP gain, if TII HP LOSS
mild streetport - no HP gain unless more flow -> more fuel
ported S5 intake manifold - HP gain
ported tb&mod - unless more flow/fuel no gain
full dual exhaust - hp gain, but questionable if its too open
k&n cone intake - slight hp gain
griffin rad.&black magic fan w. evans npg+ - no gain
10pd cro-moly flywheel - no gain
eibach progressive springs - no gain
tokico hp's - no gain

If you have stock fuel system, stock injectors you are not producing more HP than stock. The only difference is if you have NA S5 rotors and S5 intake manifolds, thats power gain max 10-15 HP, thats max, its probably arount 8. If you have TII rotos you loosing LOTS OF HP!!! A LOT!

Please dont trip, I just want to point something out, no disrespect at all, no hard feelings, everything is cool, I respect you work and desire to make you car fast. Its all good.

 

anther impotant thing is, How is your timing?

 

remove the family of mice living in your secondary intake runners.


and petex - you're smart.


like, not at all.

 

So let me get this straight. So you're saying, that without upgrading fuel, no mod will get horsepower. So I guess all the others who have done street ports, full exhausts that are running right where this guy should be or more, must be flukes?

That was also posted by you, saying that his fule seemed to be pretty much normal.....so which is it?

 

You don't have to put larger injectors or a fuel pump to your car! Don't listen to anyone who tells you different!

Get a s-afc if you realy want to, and adjust it according to your a/f ratio.

CJ

 

That's right. The airflow meter deflects more when your engine flows more air due to porting. The deflection of the air flow meter results in the ECU signalling the injectors to spray more fuel in along with the increased air. The way that guy wrote it, it is as if the engine will lean itself out if you street port it by virtue of flowing more air without flowing more fuel, too.



I doubt any N/A would need larger injectors. In fact, most fuel tweaking with the S-afc that I read about is leaning out the upper range, not adding more fuel.

 

petex, you don't know what you're talking about at all. If anything he would want to lean out the mixture.
Why don't people understand that more fuel does not equal more power?

 

yeah,the fuel's a no brainer....especially since i'm running rich at the upper rpm band.duh!
i guess i'll do a compression check this weekend,and see what it is.time to pick up some magnacor wires,too,i suppose.and throw some plugs in.
i advanced the timming slightly,i can check that again,too.
the thing is,the cars always felt the same since i did all the work to it.and,i always felt like it should have been faster.i reeaallly hope the compression's good.2600 bucks is a lot of money to spend on a pos motor.
still,thanks for all the input.
~d

 

13.8 A/F ratio is where I made alot of power with my N/A...It was up to 158rwp before alot of my mods in the sig.

I have 0 ( ZERO ) fuel mods with my setup (stock engine)
and was running rich around 12.1/1 a/f ratio. As you can see a turbo11 uses this a/f ratio.

The difference between 12.1 and 13.8 apx was 8 rwp so this isnt the cause of your power loss.

The S4 middle manifold may be slightly better compared to VDI with a ported engine but this also is probly much less then the difference then say between your VDI being open and closed during runs.

The MT duel exaust is the best option for your setup im guessing because I see E-Prod racers and ITspec racers use nothing but those duel outlet headers. Thier only alowed streetports by the rules.( or something )

Timing will net you around 8rwp at most with your mods. Less with mine im sure .. this cannot be the case with you.

AFter you check compression and the AFM meter and it turns out good then mabey its a combined effort of F-ed up mis-tuning.

Dont believe anyone who says that your hp #s look normal. They obviously have not modded an N/A. I went from 140rwp with stock manifold exaust to 154rwp off the bat when swaped out with RB headers ( before after dyno )

 

By the way compression #s should be 6-6-6 and 6-6-6 according to mazdas minimum standards. I think fresh engines have 8 to 9s

 

I didn't say that he needs bigger injectors, stock injectors can handle 160 rwhp just fine. To upgrade the fuel system I thouught that he could get S-AFC or somthing...

I personaly think that his problem is with exhaust. I think his exhaust is way to open s he looses hp. On every engine (NA or TII) you need backpresure, otherwise it will run like crap with no power. And about rotors, do you have NA S5 or TII S5?

Well, what I tried to say was that if you don't increse flow in your engine you are not going to produce 80 hp over stock, If you guys dont see this, I'm sorry!

 

I dont see an N/A making over ~130 - 140 without porting and
150 - 160 with large street port.

to push over th 190 your going to need to bport it.
which you can upward in to 230 -240rwhp just depends on how far you wind it out. but if you bport it the stock efi is going to hang.

I say PP it and wind it out to around 11.5 - 12 and run around 300hp

 

just one thing, he said that he's looking to produce 190 rwhp on NA! Well.... So i said that he needs to upgrade the fuel system. I don't think that you can produce 80 hp over stock on NA with stock fuel system. Don't you guys think that fuel system needs to be upgraded???

 

87 GTR: exactly!!!

 

whats that,about 85psi on a normal gauge?i was'nt gonna pay mazda a bunch of money,just use a normal one w/o the valve and watch the bounces.


btw,for all of ya going on about fuel and so on,i guess you did not read the first post where i mention i'm installing a microtech[forget the safc].this was a baseline to see where i'm at.and,there is no doubt in my mind i should be seeing much higher numbers.without fuel adjustments/mods.

 

uhhmmm...where did i state this??

 

HERE:


With your mods Id think you should be seeing the high side of 190rwhp... Something is definately screwey...
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my point exactely.i think i unhinged my jaw when they told me 110hp after the first run.

 

if you had looked at that properly,you would have seen that that was a quote by rxmfn7