Is it possible? I am shooting for 11's and I want to use my stock turbos. my engine needs to be rebuilt and I might go extreme and get a brigport/half bridgeport. All i want is about 400rwhp. If I'm boosting around 17psi with my stock twins is that just asking for trouble. Of course I will take care of the fueling and I have a Power FC for tuning but I don't know if this is a good idea or not.

 

On stock twins I'd say your just asking for trouble. Theres been several people that have done this but have went through many turbos. If you want to keep your factory twins check out the BNR stage 3 upgrade for your factory twins. Search around and you'll find ALOT of info about them. Keep in mind a half bridgeport/full bridgeport will not past emissions what-so-ever. You will also have a high idle and what not, just search around on it. You should be able to make that kind of power on a large streetport.

-Alex

 

Yes, it's possible. Fine tuning and proper upgrades will get you there. A full bridgeport? You dont need that big of a port. People that port that big do it because they are going single. You can reach 400 rwhp with mild street port. But I suggest not boosting high all the time if you drive this car alot and just lower the boost, yet have it tuned for the highest boost you would run when you race. And like what TTrex7 said, you gotta be careful with your stock twins... 14-16 psi MAX MAX MAX is what you are looking at. But yes 400 RWHP is possible with stock twins.

Jeremy

 

there is a lot of conflicting data on the twins and how much boost they can efectively or even safely run. the resounding answer seems to be: sometimes. a bit of luck, a lot of money, and some good tuning and im sure you can achieve your goal.

 

Reliably? No. On average you can count for 360rwhp. But hey, everyone's car is different.

 

No. No way, No how. not on a street car, and not for much more than a 1/4 of a mile at a time.

jeremyb, at 14-16psi you will not make a real uncorrected 400 rwhp on stock twins (ie trapping ~125mph). people that have made 400 are running 19psi on their stockers and they turn into a pair of little nuclear reactors and you go through them faster than brake pads at the road course.........

 

I think that 400rwp is possible out of the stock twins. The previous owner estaimted that I can get 350rwhp out of the current setup at around 11psi (Rebuilt + 2/3 Streetported Motor w. 3mm seals. Rebuilt, balanced Non-seq turbos. M2 Large SMIC. Bonez DP, hi-flow cat, exhaust. Custom K&N intake. Apex'i PFC. 850cc main injectors and 1300cc secondary injectors. Optima reloacated redtop. Unorthodox pulley set. 250lph Walbro fuel pump. Custom Adjustable BOV)

I think at 15 or 16 psi it should be capable of 400rwhp for a few minutes before blowing up :P

So is 400rwhp possible on stock twins? Yes, but not for very long. Also my car cannot even register on the emissions scale (legal limit here is 200 and the machine measures up to 2000 and my car is over 2000 of whatever they measure, hydrocarbons or whatnot)

 

I doubt you can do 350 to the ground at 11psi - that's pie in the sky.

350 to the ground on the stock twins is doable. Going up to 400 is really pushing your luck. Getting there with upgraded twins (ie, BNR's) is quite possible.

Dale

 

Yeah I'd love to see a dyno of 350 rwhp on 11 psi. There is just no way that happens.

 

Has anyone measured the preturbine pressure at highish whp and boost? What about at stock boost? I would be curious of the pressure ratio...

 

Who remembers Dont_be_a Rikki...hmmmmmmm??????????

 

I know Ryan, he needed like 13 psi to get that on pump gas.
I think he did hit high 340's @ 11psi but with race gas. Sorry I didn't specify earlier but I doubt 350 @ 11 happens on pump gas.

 

Rikki made more power than 340, more like 370 and I don't think he was running more than 14 or 15 lbs of boost, nonsequential.

Dynos aside, I saw him run an 11.7 at Atco on one of the hottest, most miserable days of the Summer. His car made some power.

 

I'm not disputing that his car made some power, I'm just saying it sure wasn't 350 at only 11psi on pump gas ;p I know he went over 350 at 14 or 15, the only dyno I've found archived was from 13psi and he hit 350ish.

 

The question.

Can you make 400rwhp reliably on stock twins.

The answer.

NO.

Reliability is relative, 330rwhp is where I draw the line.

360rwhp and your pushing them pretty hard.

400rwhp and they won't last many miles at that boost level at all.

 

set your boost to a max of 13psi, tune for the mid 11s on the A/F, setup the powerfc to cover your *** if the boost control ***** up, and add some water injection for protection. Whatever HP you get is what you get, and don't worry about it. Actually, just assume that you'll be around 330-360 rwp, and leave it at that. It's SOOOO much easier.

Don't get caught up in the numbers game.

 

if u have money it is posible...but dont expect it.

 

I stand corrected .

 

Amen to that. I never Dyno'ed my car, so I don't know the HP. But as far as the stock twins running in the 11's, that I will say is possible. My car hasn't hit it, but very close at 12.05. This was on a stock fuel system, and even after the fuel system has been upgraded, I really haven't gone back to try. (not my main thing...)

My car is setup with the stock twins/PowerFC/unorthodox pully kit/full exhaust+intake/blitz FMIC, and bunch more. The boost is set at 12max, but I do see it going one or two lbs higher sometimes.

I stuck with the stock twins because I was thinking I would get better drivability. After only putting on about 15k miles, I'm sure the turbos are starting to leak oil. Right now I am in the mode of saving up for a single turbo kit. It'll be cheaper to maintain in the long run (or so I think).

It seems the stock turbos are just not that durable. Even with stock boost on stock cars, they seem to be going up around 50k...

Good luck!

 

I'm sure it did, but not at the boost levels he wa claiming. Rikki was full of ****.

 

I'd ask Boostn7 this question, he had a stock turboed 400+RWHP FD for a long time.

 

Do you really have to drag that out? His car has an insane amount of tuning invested in it, and is the exception, rather than the rule. From everything i have heard (from reputable sources, like other shop owners and builders) JD knows more about tuning a PFC and about all the little things that add up to make power than 99.5% of this forum. If you would like to dispute this, by all means attempt to duplicate the car and let us know when you run a 10.98 in the 1/4 on stock twins. People bullshit dyno results all the time, but time slips are much harder to fabricate

[btw, not calling you a bs'er, just illustrating the difficulty in duplicating JD's car]

 

Your Solution:

 

i agree ..but it seems that others disagree...check out my thread what do the stockers trap with all the bolt ons. Seems people dont know the difference of what is the "rule" and what is the "exception".

 

You are confusing making 400 rwhp reliably vs running 120 mph traps NOT the same. It takes 360 rwhp to make 120 traps. It's also not the execption as multiple individuals DO IT and HAVE done it, not one guy. Secondly, even if one guy does it then it is doable.

Your entire premise is wrong. You assume (incorrectly) that only a handful of 360 rwhp plus cars can run 120's.
1) What is the size of the control group?
2) How many of the cars are tuned and running correctly?
3) How many of those cars are working correctly?
4) How many of those cars are driven correctly?
5) How many of those cars are actually drag raced?

It's a fact that 360 rwhp in an RX-7 will go 120 plus mph. It isn't debatable because it has been done, by MANY.