want more out of stock turbos. how to lower lag? come on quicker? any advice please.

Most expensive E85 ever.

 

Sure there is.

Nitrous.

 

In easy terms, to reduce lag on a turbo without changing any aspects of the turbo, you need to increase the velocity of the exhaust gas.

You can do this with better manifolds, which defeats the purpose of what your doing, changing these and you might as well upgrade the snails at the same time.

You can also do it to some extent with fuel maps and timing. The richer the mixture the more exhaust gas you'll have. This IMHO is only good for building boost in free rev, as to richen the mixture enough will rob you of power and you'll likely accelerate slower.

Or you can go totally crazy with the anti-spool launch method of injecting fuel directly into the exhaust manifold for launch, which is what starts to kill turbo's.

Another radical idea is injecting water into your exhaust manifold...i know i know, crazy You (and I originally) will think that this cools the exhaust, thus decreasing velocity, etc. BUT the higher the pressure on the manifold side of the turbo, the faster it will flow to the low pressure (exhaust) side of the turbo. The water is instantly vapourised resulting in a significant increase in pressure. I've only read about this, not game to try it...i can see melting water lines and exhaust leaks.

 

Andy i know 300rwkw can be achieved with stockies, but whats the point? Your pushing the boundaries and turning your engine into a hand grenade. While you can get 300rwkw for half the money you'd need to spend to achieve that number (with stockies) by putting in bigger snails.

 

Agreed, seems like a waste of time and hard earned money. Install bigger turbo's and accept the difference in power band, or sell up and buy a HSV or something with more displacement or something that uses a single to get more HP. You'll blow your engine to pieces in the process chasing that dyno number.

 

What HE said M8! Way to go if you want no "lag". Stuff your laughing gas in off boost and when preset boot level hits, gas goes off.
All simple, affordable and done before and WORKS!!
Yee-har!
E

 

what about the blower idea? anyone thought of sticking a blower on there? one of those ones that replace the intake plenum? i think ive seen a zed with one on youtube before, i wonder how it would go in terms of power if you keep your turbos and throw on that blower.

edit : also, if you had a set of sprare turbos then would it be worth getting them hi-flowed? or can you get a better set of turbos for the same price? i haven't done much research in this area and all the a/r stuff and comp housing stuff just confuses me.

 

Well, its feasable.

The engine will produce whatever power at the preset boost level from the blower and then when the turbos hit up more again.

The engine will respond pretty much how it does now, just harder again by whtever boost pressure you seet with the blower drives.

Its copmplicated and expensive to fit and set up.
A single blower on top of the motor sans turbos completely would be just as good with a linear power delivery.
20psi boost from 1000 rpm? yeehar! tyres anybody!

L8r
E

 

hmm well ive seen those blowers from the commodore super 6s go for around 1k so yeah just wondering why no one has done it.

 

Huge root around making it work, buying the blower is the cheap bit

 

go buy a turbo diesel.

 

This is my Z

I was going to post this same link. I don't know the conversion for "rwk" to rwhp is. For a little back round these mods beat our Mark Leader's JWT SP530 turbos with head work & cams(4.10 gears originator) in 99% of the graph area on the same dyno in the same month. With my mod list there is NO lag! You can get more power with a little less lag, even on bigger turbos. It's not "worth it" IMPO, I did it to break a record and prove a point. I will be upgrading to bigger turbos next year. Good luck in your build.

 

Compound twin charging could be a good idea. Have the two stock turbos feed into an Eaton M90 rear entry housing. Keep most of the stock turbo piping (including the IC's), and add a water to air intercooler for the supercharger. You would run low boost from the turbos as the blower will compress the air from whatever the initial manifold pressure is being provided by the turbos. Boost from idle with a hefty increase as the turbos boost.

On Attilas origional query, you could have the stock turbos ball bearing'ed to drop the spool uptake by a couple of hundred RPM maybe.

 

thanks everyone for all your ideas.

Seems like pushing them any farther is something not worth doing. I didnt realise itd put so much ain on the turbos.

it wouldnt put too much strain on the engine though i gather. Guess its the same as 300kw with bigger turbos. Although faster acceleration would put more strain on the engine..

Either way i enjoyed reading all these suggestions. Fun thinking about all the possible paths i could take. And things like water injection which i didnt even know about before.

I think ill fit the nistune, dual intake, some 750cc injectors, and get it tuned for something safe. I guess 15psi is aa good number. Then ill leave it be for a while decide which path to take.

 

15 psi is all it took for specialtyz to get 400rwhp... imo manifolds are a big boost but if you do 2.5" ic piping and Z1 throttle bodies and Specialtyz 3" down pipes and 3" dual exhaust id say you will find yourself reaching your goal... my car has stock turbos and nearly everything on the 400hp mod list above aside form IC piping and 3" exhaust. i have 2.5" exhaust and my boost is up a few more psi but i did 380whp... bigger IC piping and exhaust should be more than enough to get 400. and aside from that, i think my car wasnt running right on the dyno when it did 380. if you go to the tt dyno thread on 3zc.com and look at my dyno you can see the power falls apart after 5.5k rpm.

as far as everyone saying dont go for it... why? i wouldnt dream of "upgrading" my turbos. i daily drive my car and i love instant power whether its 380 or 400