xeroes

i was wondering if the factory turbos can handle 350hp or will i be stressing it?
besides the basic mods (air filter, exhaust, intercooler) is there anything else i would need besides power fc, injectors, fuel pump and fuel pressure regulator? also what size injectors would i need.
Any help would be appreciated thanks.

cewrx7r1

iTrader: (2)

Many have made around 350whp on stock turbos and stock ports at about 15psi boost. 550/1200 injectors with either a better fuel pump and or rewired fuel pump circuit. The stock FP wiring drops about 2 volts which reduces the FP power by about 30%.

RE-Amemiya

^+1, be sure to read the FAQ's as the power on the stock twins is addressed in there. There are plenty of threads on this as well, hopefully a good search will lead you to the results you are looking for.

Trjackson

There are a few people that have cracked 400 on a street ported motor/ported exhaust manifold/non-sequential cassette twins. Rotarded is one that I can think off, however, he was very meticulous and almost "over-engineered" his set-up. However, that is why is car was rather "debo"!

As far as supporting mods to hit 350 to the wheels on stock motor and stock cassette twins safely, here as follows

Fuel pump
Minimum of upgrading secondary injectors
power FC
Intercooler upgrade.
Full exhaust-dp-mp/high flow cat-cat-back
intake
radiator
AST
Clutch

That is the Bare Mininimum as far as I am concerned.

Best of luck with your project!

Ty

1reven7

iTrader: (1)

380 rwhp at 15 psi on stock twin turbos street ported and all the upgrades.

RX7 RAGE

iTrader: (22)

nice numbers 1reven7. was that 380 rwhp on 93 octane?

widebody2

Trjackson, I ran that setup for about 4 years on a old *** engine with zero problems....using the stock radiator + AST elimination. Never once had any problems with anything, let alone too much heat.

I actually feel like my 7 was by far the most fun when I had all the supporting mods, stock seq turbos running 15 lbs. If i ever get another 7 that will be the point at which I will stop modifying. And even if 15 lbs is a bit much for the turbo and they eventually blow...who cares. So many people have gone single that you can pick up a good used set for peanuts these days.

1reven7

iTrader: (1)

Yes 93 octane pump fuel. I wanted to push more boost to get 400rwhp but I was advised not to if i was not going too run race fuel.

GoodfellaFD3S

iTrader: (213)

I made 368 at 15 psi back in 2001 on stock seq twins and mildly ported motor. supra pump, 1300 cc sec's, all the bolt ons.

rotorypolo

iTrader: (1)

350 rwhp /280 tq on all supporting mods, large street port and about .91 bar here

dubulup

nice #'s...but the torque curve kind of sucks.


^table top torque with a small single turbo.

amp

iTrader: (50)

stockers didnt last too long makin 300rwhp.. ive already gone through two sets at 12psi..

wReX

iTrader: (6)

Mine have held up running 14-16psi for the past few years... just now starting to leak a little oil though.

367rwhp/348rwtq... close to 16psi, non-seq, mild port job... the tune was not the most aggressive plus this was on a mustang dyno. Tried pushing up to 17-18psi a couple times but couldn't get away with it, guessing the wastegate would need to be ported.

My advice is to just go single instead of playing around with the stockers, '99spec(nothing special there), BNR's, ect.

G's 3rd Gen

iTrader: (11)

15-16 psi.. I always run 25% mix 100 octane unleaded. Afr's look a bit high because of 2 exhaust leaks. Mine was reading no higher than 11.2. Fixed the leaks and next dyno session my wideband was .1 off to the shop's. No problems for 2 1/2 years and 9000 miles. Motor has 12,000 on it. G

dubulup

that isn't your problem at all.

1reven7

iTrader: (1)

This is a stock twin thread not a single turbo thread apples to oranges

3rd Gen Jeremy

I've got brand new Efini Twins Sequential, DP, MP, intake.

I'm planning on putting a SMIC with duct, APexi FC, injectors, fuel pump and radiator. What do you guys think I can get away with as far as how much boost I can safely run through the engine without blowing up my turbos or my engine?

Also what kind of numbers should I be looking for without porting the engine?

Thanks,
Jeremy

dubulup

from the thread starter...
I helped, because I showed you are stressing your twins ie. rwtq torque dropping 65ft-lbs after it maxes out.

dubulup

safe boost...everyone has their opinion. Personally, I wouldn't run over 13psi with the twins sequentially (which you can do with the stock injectors). Powerwise w/o porting 300-320rwhp.

wReX

iTrader: (6)

Well then what is the problem? Thanks for all your valuable input in this thread. I'll be sure to let the tuner(Gotham) know they were wrong.

dubulup

I have no idea what your problem is...but I'll guess it the stock twins.

how is porting a wastegate going to allow you to run more boost

a wastegate vents boost to lower/control it

a larger wastegate will allow for lower boost in a system that flows more (read too much) air.

NissanConvert

iTrader: (1)

I could very well be wrong but i limit my boost to 10lbs although from what i understand i'm still safe at 12lbs. My peak inj duty has been 70.0% and that's what i'm compfy with. I have an unported set of stock twins on a 3" exhaust. I'd perfer to have the safety net of lower boost until i trade in my twins or get them ported.

widebody2

what the hell is all this talk about porting wategate's allowing you to run more boost safely...or more boost at all....like dupulop just said it has absolutely nothing to do with that.
A bigger wastegate allows you to run less boost. If your wastegate is not big enough you have no choice but to run a higher boost than you were intending on....because the wastegate wasn't big enough---it could not let enough exhaust out so the boost went higher than it was set for.
WTF are a lot of you guys talking about?

Wargasm

To answer the original poster's question, the stock twins are at their limits at around 350 rwhp. Sure, a few people make more, but how long do they last?

If your target is 300-350 rwhp, the stock twins are a pretty good (cheap) pick. If you're shooting for 350+, I think in the long run, you save money by going single turbo. Just my 2 cents.