okay so this may be a stupid question but if a turbo makes your engine so much less reliable,how are dodge diesels still getting 280,000 miles on the engine,and how can they put them in other cars from the factory and still warranty them?could it just be that in some the tuning is wrong or people are giving their engine to much boost?im just asking because it seems like a lot of posts say that if you install turbos you lose all reliability,and i dont have any experience with turbos in a car setup but my truck has a turbo,it is just kind of confusing to me,and i was wondering if someone else knew more about it,{which wouldnt be hard} thank you

 

The truck was designed for a turbo. Our car has a very high compression ratio. That is good for NA power. With turbos it is better to have a low compression ratio. If you run too much boost on an engine with a high compression ratio it will eventually blow up. If you put in lower compression pistons it should be fine.

 

+1

Also, tuning is also a priority. Like said, the engines are designed for a turbo. most people slap on a turbo kit and expect to work w/o a problem. Any form of forced induction increases the compression ratio and is more likely to cause detonation w/o proper tuning.

 

You are right
cause I had a shop for diesel engine
sample..
Cummins K-19G had a 14.9 CR Piston + Water cooled Intercooler + Big Turbo
500 ~ 600 HP at 1800 rpm
I seen many Piston detonation on this engine and main problem is Injector

 

thanks for the answers everyone.i figured this was probably the case on the diesels, but what about the 300zx,wrxsti,3000gt,dodge stealth,and quite a few of the more expensive cars?do they lower the compression and then install the turbo or turbos?how do they get the better reliability so that they can warranty them?and thanks again for the answers so far and those to come.

 

Turbocharged vehicles from the factory are made to handle the turbo. They come with stronger rods, proper compression pistons, etc.. Which is why those cars can take such a beating with aftermarket parts.

For example,the Nissan SR20DET I am building is turbocharged from the factory. I am going to pushing over 400rwhp on the stock bottom end reliably, cause the stock bottom end is more than capable.

 

There are two BIG reasons why diesel engines run so long. 1) Diesel fuel does not detonate. You will never hear a diesel motor ping. 2) Redline on these things is 2800rpms. If your Z was turbo but you never reved above 2800rpms, it would run a million miles

 

actually the diesel redlines at 3200 rpms,but that should be comparable to a gas engines 7000rpms or so redline.but it sounds like the cars that do come from the factory with a turbo or turbos just have a much better built bottom end,but why wouldnt a vdq35 be just as strong as the sr20det if you built the bottom end up in the vdq?

 

I think cost would be an issue if the vq came built from the factory, imagine the msrp on a 350z being $40k, I doubt nissan would sell many.

With an STi or Evo you are paying well over 30 grand for a blown economy car with a 4 cyl when you strip everything down.. just think of what we'll pay for a turbo'd VQ.

 

good point

 

but if you wanted to and had the money wouldnt it be possible to build the vdq up and have just as strong bottom end?

 

Performance Motorsport in NY just finished with a pro street 350z. They are running a built vq35de and it is producing upwards of 1200 hp. You can read about it in the new issue of Performance Auto and Sound. I myself am curious if the vq can handle that kind of power on a constistent basis.

 

by what warped logical process did you arrive at the conclusion that turbo engines are less reliable?

 

im just asking because it seems like a lot of posts say that if you install turbos you lose all reliability, actually my argument was that you should be able to turbo reliably,just read quite a few posts that said when you turbo you lose all reliability.

 

actually i think you should be able to turbo with good reliability.i just asked because a lot of posts on this site said that when you turbo you lose all reliability,and i wanted to learn more about it.

 

I think even if the price was over $40K for a nice turbocharged VQ35 in 350 I would definately buy it and so will others. To "real" car fanatics I think it's definately worth the extra $$. I paid $37,000 for my track with about $14,000 in after market parts... and still not done. Tell me if I'm wrong....

 

based on the title of this thread, i would just like to say:

yes, I know the answer.

you're welcome. Next time be more descriptive in the title

 

so if you know the answer, post it, isnt that the point of this forum to help people learn and talk about a car we love.

 

i was just messing with you with how undescriptive your thread title was

but it's basically what everyone else has said. Diesel trucks don't get pushed to redline as much since they have so much low end torque