i've been checking everyones dyno posts and i've seen people hit @350 hp with stick twins. I want to stick with my twins and i was wondering what I need to do to get the 300+ hp range?

 

Exhaust, good air set up, intercooler, Power FC and you could maybe run the turbo's parallel. I have seen a car in person reach 400hp on this type of set up.

 

you cant safely run much more than 320 with stock injectors. My car is 304 rwhp on stock twins at 13 psi. Injector duty cycle is around 95%. It is a safe tune/build (a little rich).

at400hp the twins have the boost way up and are very inneficient there, resulting in lots of extra heat.

set up:
power FC (steve kahn tune)
full 3inch pipes
greddy smic
m2 air intake
hks twin power
dual oil coolers and cf ducting
stock injectors
stock plugs
hks twin power
ported Waste gates on twins to reduce creep
profec-b ebc

 

also running over 330hp shouldnt or wouldnt it be a lot easier to be running non sequential as well?

 

I am running seq. on a ported motor, and I am at about 360rwhp with upgraded fuel, IC, fuel computer and exhaust about 14 psi.

 

350 at the wheel with a Pettit ECU and all the bolts-on has been done

 

That mirrors my set-up.

 

I made around 368 at 14 psi

 

besides mods listed above ... you'll have to upgrade your 2ndary injectors to at least 1300 cc

w/stock 850s, you'll be maxing out at about 12 psi, and low 300hp.

 

I made 331whp with intake, exhaust, FMIC, non-sequential turbos running 12psi on a ported wastegate, hks twin power and an RCTS tuned ecu. Stock injectors. The air/fuel was 9:1. WAY to rich but hey, at least she didn't blow up. haha

 

i read that porting the motor is a quick way to blow up the motor. but im newbie so i dont know **** but without porting (keep in mind i would like to DD my car) what would it take to get 300 hp range? sry if im thread jakcing but i thought it was almost the same question.

 

If the engine is apart and you purchased this car for performance, you should definately port the engine or atleast clean up the ports if you dont want to affect port timing. Porting will not blow your engine up, detonation, overheating, or the car being in the wrong hands will blow the engine up.

EDIT: Just noticed you are in Cali, so I assume you emission challenges where you live. Read up on porting and tuning before making your decision and speak to some of hte members in the Cali area with FDS and see the routes they have taken.

 

surprised the car doesn't immediately bog out that rich

 

nothing wrong with porting as long as you have the fuel mods and tuning to support it

 

This does not sound plausible. The AFR meter must have been faulty. As another poster pointed out, car would probably bog if you were dumping this much fuel. Also, you would be making very little power. And would probably foul the spark plugs in a few hundred miles.

 

330 on wheels @14 psi on pump gas with:

Upgraded Intake (SR Motorsports)
Street ported motor
New upgraded radiator
New Blitz bolt on Intercooler
New twin turbos (non sequestial)
New injectors (still same spec as factory)
Greddy down pipe, mid pipe and exhaust (no cat)
Microtech

Could go higher but I want to enjoy the car a little longer plus 330 for me is more than enough to enjoy the car on the streets.... :-)

Loving every minute of it.

 

well i already passed smog but knowing about the numbers i want passing it again will be the problem. but i just bought my FD last sunday so still a little ways of making any mods to it yet. lol im only 19 and have an FD but to be honest the car scares me. its so nice and fast that im worried about every car and noise. im gonna take it to jiffy lube on sunday and then after that take it to a mazda place i know and get them to do an estimate on my car for problems they can find.

 

i've read about this somewhere, and the most "ANYONE" has ever seen outta stock twins is 380hp and it was built by gotham. They said it was pushing the limit in every area too, meaning, it probably wasnt good for the engine.

 

Search a little more, 402 rwhp is the most recorded or atleast posted on this forum on stock twins. Car went 10.98 at 122 if I remember correctly on slicks or ET streets. Car had trapped 124 or 125 on other radails if I remember correctly.

 

Dont go to the dealership, there should be plenty of reputable shops on the West Coast for you to take the car to. Trust me on this one, go to a rotary specific shop, it will be the best decision you have made.

 

^Listen to that advice. Trust me.

 

Thats close to what i hope to be making, actually a little higher. I didnt think you could go ever 12psi with stock 550's and 850's though? Then again your motor is also ported & mine is not, so i'd probablly be safer only pushing 12 pounds.

 

Yes it is if you creat more overlap with your port timing. That will greatly effect emissions since now more unburnt fuel will be pouring out the exhaust. It all depends on how you port it.

 

I'm pretty sure you can keep the 850s in the secondary rail.. just install a good FPR and turn up the fuel pressure, if you've got a good pump and somebody who knows what they are about than this *should* be good for much more than you would initially expect.

Without a pressure regulator you will, in fact, hit the ceiling of what the stock injectors can do though... I just had an initial tune done to mine and capped at about 12psi and 280 rwhp (on a Dyno-Dynamics).


The stock twins lose efficiency at 15psi. I forget the technical term, but this is the point where they start producing more heat than the compressed air can compensate for. Going much above this mark is *supposedly* detrimental to the actual power being produced and can net lower overall numbers than a lower PSI within the HT12's efficiency zone.

 

I hit 338whp on 15psi(stock twins). 400whp/ 25psi at 4k rpm (boost controller poped off, car is still ok).