Can't reply as to which is best. More is known about the GReddy because more of them have been installed. I have no transmission issues so far on my 5AT.

 

Awesome. that is information I really needed to know. Thanks so much Kshep! How do you like everything so far? Saw you didn't do any internal upgrades yet. Everything going smooth?

 

This kit looks interesting...
http://www.speedforceracing.com/prod...35turbokit.php

350Z/G35 twin-turbo-$7995
Polishing option-$495
Ball-bearing turbo option-$1200

350Z/G35 twin turbo system
The 350Z and G35 is definitely a well rounded sports car.They have the looks that make people turn their heads.The handling of these cars is great and the power is adequate. However, we felt the the performance hungry enthusiaist might find the performance a bit anemic.For most people, this is not enough so we develped the Speed Force Racing twin-turbo system.Now you can have a dyno proven 402 horsepower at the wheels out of your 350Z/G35. Imagine 482 horsepower at the crank? This is enough wheel spinning power to leave pretty much anything in the dust.The amazing part is that it only requires 6.5psi of boost to do it! The Speed Force Racing twin-turbocharger system does not require any internal engine mods.The only thing that is required is a competent mechanic and a tankful of 91 octane pump gas to unleash the beast.How can we make more power then the rest? It is easy.We focused on efficiency.This means we can make more power with less boost which ultimately leads to a longer life span of your motor.

The Speed Force Racing twin turbo system for the G35/350Z includes the following parts: two T-3 turbos,turbochrger mounting brackets,oil feed and return lines,321SS headers with slip-fit merge collectors,two 38mm Tial wastegates,two 304SS downpipes,Spearco intercooler(the G35 gets two),Mocal scavenge pump,aluminum oil sump,hoses and fittings,aluminum intake and intercooler piping,silicone hoses,stainless steel hose clamps, HKS Sequential blow-off valve,two K&N airfilters,Split Second engine management system (which comes pre-tuned) and all hardware and instructions needed for a professional install.

A few of the unique features of the Speed Force Racing twin-turbcharger system includes, a blow through mass-air sensor set-up.The air metering is much more accurate this way.We incorporated the sensor into the intake pipe so there is less clutter and more style.Another benefit of doing it this way is the fact that we can use a real blow-off valve that vents to atmosphere.

For the G35 we included twin Spearco intercoolers.This way the system could be used with the stock front bumper cover.There are no modifications required to the aluminum support structure like other kits. You can see that we are concerned with optimal airflow.This increases efficiency.Increased efficiency means increased performance without more wear and tear.

Another benefit of our turbocharger system is the headers.We use a real collector to merge the exhaust gases together.This improves the overall power and torque.We also mounted the turbos down low to alleviate problems assoicated with the heat generated by these two turbochargers.The other turbo systems on the market utilize log style manifolds and mount the turbochrgers high in the engine compartment which means that vital components are subjected to a tremendous amount of heat which will lead to premature failure.Why would anyone want to take a chance like this?

We utilized two T-3 turbochargers that are good for upto 650 horsepower.The twin Tial wastegates can be dumped to atmosphere or routed back into the downpipes.We use mountig brackets to secure the turbos to the motor to prevent the heders from cracking becasue of the wieght of the turbochargers.

Big power and a flat torque curve is what you get when you purchase the Speed Force Racing twin-turbo system for the 350Z ad G35.We gained a peak of 150 horsepower at the wheels and the peak torque increased by 150 ft/lbs.The best part about the twin turbo set-up is tat you maintain over 310 ft/lbs of torque from 2000 to 7000 rpms! It doesnt get any better then this.

 

Greddy is what I have. If 650 is eventually your goal, I would vote for Greddy or APS. APS uses the ball bearing turbos, so the spool will be faster. The Greddy TT is built for boost. Most of us on stock internals are not even close to the sweet spot on the turbos as far as boost.

 

To Brian. . .
That kit is nice, but I have a 350Z, haha.

To t32Gzz. . .
do you have a 5AT? And from reading from what you have done performance wise on your car. . . that is the route i'm going right now. I plan on upgrading everything down the road, but not running the crap outta my Z until I do so to be safe.

I don't know all too much about the APS kit. Do you think it is actually BETTER than the Greddy due to the type of turbos? It seems really sweet. Think I would be able to put on twin HKS SSQV's? I looove the sound of those on Charles's Z.

 

I have a Stillen stage 3 supercharger on my 5AT and couldnt be happier


cept maybe if I didnt have to work 12hrs a day

and If I had BMW SMG type system, thatd rock

 

OK, so there are 3 turbos that haven't gone yet... Is that 450rwhp on a daily basis or just 1-3 dyno pulls for bragging rights? The numbers show that this motor can not handle 450rwhp on a daily basis. Charles has been lucky and has one of the cars I referenced earlier.

I could care less if you blow your motor just like 12 others have already. Phunks will go and so will the others. That is why they are building their motors now. I think its kind of sad you can only think of a couple guys that haven't blown their motor yet. There are others but they are boosting next to nothing and certainly don't track their car.

 

* I know of more people that have blown their motors, but becuse of boosting at stupid high levels on all stock internals.

* I will not be running hardly much boost at all around town.

* I work for home, so I won't be driving my car much anyway

* I don't track my car.

And if you don't mind me asking. What is your frist name Whosdaddy? Are you Preston?

 

No I am not Preston, he goes by ZainT (sp?). I have a 5AT. His is a 6MT and he has the Greddy kit done by light speed and his is the other kit that has 42Xrwhp and has not blown yet. He is also lucky but has been told he will be needing to build his motor.

 

Gotcha.

 

Read the beginning of the Turbo description and throughout the information. It's for both the 350Z and G35.

 

I dunno... I doubt that my motor is gonna go...

definatly would not surprise me or catch me off guard one bit... but I do not forsee it happening.

I have started to loose track of mileage but its somewhere around 11,000 on the boost now. I floor it in the car any time i am accelerating and i got in countless races every day and I simply put the car thru worse case scenario.

I have a hard time basing it on luck... if this engine was on luck than it would have thrown a rod NA... I have no luck. But you never know.

 

Well, I'll jump in. My car is putting over 450whp down right now. I drive my car daily with 8.2 psi at the minimum, which puts me at 450whp, and a few times a day I jump up to 9, 10, 11 or 12 psi. Made some runs with 13psi, a few at 14.5. Well, we did a leak down and compression test, everything is just fine. I have been driving like this for 5000 miles, abusing this thing daily. So, I think your statement is BS. It can handle it daily, maybe not for a very long time and that isn't expected, but it will handle it for a while.

 

I'm sorry your calling BS... Not everyone uses or wants to use 100 plus octane to keep their motor from going You couldn't pay me enough to spend $5+ a gallon and talk about inconvenient.

By the way, is this your second or third motor?

 

its not really my arguement but to me... well... 100 octane is available within 10 min of anywhere in the area... its $3.90 a gallon... and well... that extra $1.70 or so a gallon is a lot less inconvenient to me than a flatbed tow truck and a blown motor

Hell... if I pay $1000 extra over the course of 588 gallons of gas taking me say, estimating, maybe 6000 miles (at a conservative average of around 10 miles per gallon)... thats only $1000 extra over the course of the average persons entire summer driving enabling me to make much much more HP than most and have seemingly 0 reliability issues... well to me and my list of priorities it works out like the best bang per buck.

IF someone said to you, for $1000 your car can make 70+ extra HP and not blow up for the next 6000+ miles... would you say no?

-Charles

Edit, screwed up some math, corrected... I think

 

Well said charles.

 

5$ a gal? No way. I agree with what Charles said. I'll take the added saftey and performance for another few bucks. Besides, if you think 100 oct is too expensive, why not just use some methanol/water injection? That's proven to work very well and is very cheap. You know when the only time my car pulled timing when running 100 octane gas? When I was at 13.5 psi. Not bad for a high compression motor with "weak" internals running "pump gas". This is my second motor. What are you getting at?

 

I'm really not argueing here... I just think its funny that some guys still feel safe on stock internals boosting over 6PSI with a turbo with this car. How many blown motors do you need to see?

Phunk I have been to Chicago several times while my MKIV supra was having a single turbo installed at Sound Performance. Race gas is eaiser to find in Chicago than in St. Louis. It is about 15 minutes away for me and the cost is more than $3.90 a gallon. Will I use it at the track or on the dyno? YES. Will I use it on a daily basis? NO. Its kind of like filling up your nos bottle IMO. INCONVENIENT

I would have to stick with my original point and spend the extra money on building the motor. Sure, according to your math you spend $1K in the summer, $3k in the winter/fall/spring. Wow thats $4K in one year just for race gas... And still you could blow your motor. Also note you could have been close to having half of your built motor paid off instead of using race gas.

For your sake I hope your motor holds up but I don't think either of us would be suprised if it failed. Have you seen in person what our rods look/feel like? I have never felt such a flimsy peice.

 

There is really no argument here, just voicing our opinions. For us, obviously 100 oct is readily avail. It's like living in California. 91 oct is usually the highest you can get, but sometimes you find 93 octane or so. Wouldn't ou go with the 93? I've seen a few stock rods and pistons. One from my original motor, and one we just finished building. You all keep dissing the stock rods, but in all reality they aren't THAT bad. Hell, they can hold 10+ psi for me for quite some time now, so they can't be that bad.. And I do hope my motor blows up, then I'll have a reason to put my built motor in quicker. I know it won't last, but I'll have fun with it while it does. I think I'll turn the boost back up to 13.5# on my way to lunch today..

 

I have cams and have run 11PSI on my motor with the procharger. I have hit 443 rwtq with the torque converter (I have a 5AT). I know it doesn't produce as much torque as a highly boosted 6MT turbo but I was scared to death. I currently only run 8.2PSI and feel this is the end of the safety margin.

Both Ravaz and Phunk have built motors waiting for install. For me I would rather install the built motor now and turn up the boost. Why wait for the stock motor to blow? Why boost under 13PSI at all? Sell the stock motor while it's in one piece