rzograbian

i have a question about singles in genral, does it make the life of the motor shorter? i would think that stressing the motor to make that much power is not good but its not at that high of a boost setting. but i do realize pushing 15psi on stock and a single is different. i thought that it would be better because your motor runs cooler and it would be better for your water seal which is a common problem. the other thing to worry about is the apex seals and that has to do with tuning. so is there any reason to belive that adding a single will kill the motor sooner?? also, it is a ported motor with 2 peice 2mm Rotary Aviation seals.

what do you think?

Broken09

iTrader: (1)

I think it all depends on which turbo you're running and at what boost. I would think that a turbo such as the RS6 could possibly allow the motor to run as long as with the stock twins as there would be a similar amount of stress since it's a smaller single, but because it would run cooler that would help. However, I feel as you increase boost and or hp you'll of course put more stress on the engine causing it to give earlier.
-Nic

rzograbian

any other opinions....... its a daily driven car...... also, what if you keep the boost low? like 8-10 street and 16-20 drag?

AREITU

I might be picking up a blown 3rd gen soon and I'm just checking out some options. Anything that works well with stock ports, has similar boost characteristics as the twins (well, minus the 10-8-10) with just a tad bit of room for a mild street port will do fine.

Anyway, as far as I know, you get to eliminate the whole rats nest, meaning you don't have to go around looking for a mysterious vacuum leak or solenoid ground anymore. That alone may be worth the extra reliability: Less chance of sudden overboost from a wastegate vacuum leak! The less crowded engine bay is also likely to stay cooler.

If a turbo flows more CFM at the same boost level as the twins, you'll get more power. I saw one guy with a street port doing a good 400hp @ 10psi on a single. Don't remember what, though.

Information regarding singles that keep the car fairly close to stock is hard to find on this board. Most guys go single when they want some humungo power.

Broken09

iTrader: (1)

I think the thing you need to ask yourself is what will you use your car for primarily. Take me for instance. I wanted a nice increase in power, but because a lot of my driving is done on the street I wanted a fast spooling turbo so for me it was the GT35/40. With my large street port it spools very fast. If you plan to drag your car a lot then you'll want something bigger I'd think. If the car is street driven and autocrossed a lot many people go with either upgraded twins or the rs6 kit. It really all depends on what you want from the car.
-Nic

rzograbian

i know what i will be using it for but my question is for example, if i run a T04R on a streetported 13b with the Rotary Aviation 2mm 2 peice seals, "how" will the motor go? if it is tuned right and not abouse everyday, what can happen?? also, i plan on running synthetic without the oil metering pump. that way, i dont get synthethic in the combustion chamber and it will be better on the metal parts!

Broken09

iTrader: (1)

It's hard to say how long it will last. There really aren't enough people that drive their singles on a constant basis to give you any type of idea of longevity. That's the unfortunate part.

rzograbian

i know but is there any reason to belive that a car with a T04S turbo kit running at 14-15 psi and driven normally would not last a long time?

rzograbian

i know that it hasnt been proven that a car can last that long under that much stress but it hasnt been proven that ir cant either!

rzograbian

i know that it hasnt been proven that a car can last that long under that much stress but it hasnt been proven that it cant either!

Broken09

iTrader: (1)

Again it's hard to say there are other factors to take into consideration like the tuning. More specifically the AFR that you aim for and the type of driving (ie highway, stop and go) no it hasn't been proven either way. I guess at this point you chalk it up as anything is possible. Sorry I can't provide a more specific answer.
-Nic

SPOautos

sorry double post

SPOautos

Actually thats probably the best data available. VERY FEW people with large singles drive thier car daily. Its not to say it couldnt be reliable but it seems to be very difficult to get them to that point. I'm sure there are a few people that have a rock solid reliable daily driven high hp single turbo car....but there arent many of them. I think its mostly a function of getting the "package" just right and tuned perfect so that the car actually drives like something you'd want to drive daily. No one wantes to daily drive a car that bucks all around when you get on and off the gas, has a clutch that gives you a work out, ect ect ect

STEPHEN

SPOautos

sorry, double post

rzograbian

yea thats true. i dont really mind about how it rides or sounds. as for the clutch, my left foot has more muscle than my right because of driving a manual in traffic so i dont mind....... that's kinda funny

felix_is_alive

if you keep the boost low (12-14)you wont have a problem , a lot of engines that run high boost (20-25) just dont last long whether its pump gas or not , the stress kils it ,the heat thats made ,maybe it wont break but you will see things such as side seal wear and spring compression,ive had this discusion with cam many times and he also agrees that anything above 14 psi is doable ,but will shorten engine life

Conv.WS6

Well said and I think that about covers it. Single with low boost will be fine, but that boost controller **** is just too easy and tempting to keep it at 14 vs 20 you know.

rzograbian

yea, i agree with you there

artguy

i still cant believe there is no answer here.

simple answer would be...i have a single turbo fd and it lasted 18k after it was tuned....or ive had my single turbo fd and it lasted 42k but i only boosted it on every other saturday....that kind of thing....

im curious of this as well. what is motor life running 400-450rwhp single on a regular basis? normal driving and zooming around...not dragging at the track thirty times in a row.

there are plenty of guys around here running singles for the past few years. i always hear "if you go single you will never go back" well where are you guys. lets hear it. how long are your motors lasting?

guessing and heresay dont help.


jason

maxcooper

I popped my engine with the RX6 because I leaned out the the fuel map too far. It was my fault that the engine went, rather than stress from a single turbo. I killed all three seals on one rotor, but the other rotor and housing were in great shape. The engine had 25K miles on it, 15-20K of which were with the single. I was running as much as 18 psi, but usually about 15 psi. I drove the car pretty hard - I got on it at least once every time I drove it, and did at least one track event with the single. The engine never got hot on the street, and ran cooler at the track with the (not water cooled) single than it did with the stock turbos.

I think that though a single turbo could theoretically be more reliable (less stuff to break, less heat stress on the engine), the reality is that there are bugs to work out with any system and you often have to do that debugging yourself with a single setup (which almost always includes other changes to the fuel system and ECU, etc.). Sometimes that debugging process involves an engine rebuild. I do find that the single is more consistent (i.e. you get the same boost run to run), which is a nice change from the sometimes finicky sequential system. But it took me two different boost controller setups (one was a rig, then I got an AVC-R) and two wastegates (A'PEXi wastegate was unreliable, replaced it with a reliable HKS S/S Racing WG) to get there.

-Max

patriick

iTrader: (3)

max,

At what boost and AFR did your engine pop?