Could an L67 handle a single LARGE turbo??

[John D.]

Would there be any issues with an L67 handling a single large turbo. It seems like there wouldn't be much of a problem due the stock setup for the M90.

I don't know all the turbo lingo, but, I was thinking along the lines of the large turbo they upgrade the Supras with. I think it's the T72 turbo, not sure though.

Also does it make sense to expect a rather large performance increase due to the turbo being more efficient than a screw-type supercharger?

[HAZ-Matt]

<blockquote>quote:</font><hr>Originally posted by John D.:
Would there be any issues with an L67 handling a single large turbo. It seems like there wouldn't be much of a problem due the stock setup for the M90.

I don't know all the turbo lingo, but, I was thinking along the lines of the large turbo they upgrade the Supras with. I think it's the T72 turbo, not sure though.

Also does it make sense to expect a rather large performance increase due to the turbo being more efficient than a screw-type supercharger?<hr></blockquote>

Makes sense. Should take less power to spin the turbo. With that big turbo you won't have the low end that you get with the Eaton, but the top end should make up with it. Would this turbo setup be intercooled? If so then you increase the amount of O2 that you are flowing dramatically while reducing likelihood of detonation. All in all I would say that generally the turbo would make more power. You'd just need to go through the calculations in order to select the turbo and make sure that whatever one you choose is operating eficiently, without surging, throughout the rpm range.

Ok some of that was rambling. I think the main issue would just be lag from the large turbo, and the limit of boost that the L67 can take (but I don't know what that is).

[nocutt]

<blockquote>quote:</font><hr>Originally posted by HAZ-Matt:


Makes sense. Should take less power to spin the turbo. With that big turbo you won't have the low end that you get with the Eaton, but the top end should make up with it. Would this turbo setup be intercooled? If so then you increase the amount of O2 that you are flowing dramatically while reducing likelihood of detonation. All in all I would say that generally the turbo would make more power. You'd just need to go through the calculations in order to select the turbo and make sure that whatever one you choose is operating eficiently, without surging, throughout the rpm range.

Ok some of that was rambling. I think the main issue would just be lag from the large turbo, and the limit of boost that the L67 can take (but I don't know what that is).<hr></blockquote>


I concor! Although this particular turbo will be ill suited for the L67 except one does some major engine work and turn the L67 into a high winder. That turbo is too big...I haven't looked at the compressor map for this but lets just assume you start making useful boost at about 3500-3800 RPMs you only have about 2500 RPMs (simplification) to play with giving the fact that the stock RPM limit is 6k...in other words not enough play time. The good side: with this much lag there is so much air flow and power capabilities...although it just doesn't match the L67's stock parameters!!

[John D.]

What size turbo would be more well suited for an L67 application?

[xjarayax]

My guess would be a T3/T4 Hybrid.

[navyblue2000]

t4 turbo....69 turbine for easy spool...and a .8 ish compressor side.

i guess all the talk in redlinevsix is makin you nervous [img]tongue.gif[/img]

[Formulao96]

Take it from experience....DO NOT RUN A TURBO WITHOUT AN INTERCOOLER...just some friendly advice.

[daWhoady]

single set-up, a t-4 would be nice. An intercooler isn't needed if running low boost, but highly suggested if you want to run higher boost.

[toast]

A GN or a TTA turbo should will work well

[John D.]

<blockquote>quote:</font><hr>Originally posted by Formulao96:
Take it from experience....DO NOT RUN A TURBO WITHOUT AN INTERCOOLER...just some friendly advice.<hr></blockquote>

If I decide to run with this I would definately run an intercooler. I would be wasting my time pulling the M90,strapping on a turbo and only runnning a few psi of boost due to not being intercooled.

Thanks for the advice though

[Morgan]

A T72 turbo is a solid mid-10 second turbo. It's too large a turbo for a stock motor; it really needs heads, cam and a loose converter. Also, a major fuel system upgrade will be in order to the tune of at least 55# injectors which, on the older V6s, requires the ECM be modified with new drivers to run low impedance injectors. I am currently pulling my TE62/55# injector combo in favor of a 70-series turbo and 72# injectors.

Regards,
Morgan

[DEE97GTP]

Whoever turboes their L67 and tunes it correct will have the most powerful L67 to date, that is a fact. I don't know alot about turbo sizing so I can't help you there. My dream is to due this also, but I don't have the extra cash right now.

DEE

[Jason]

Couldnt you run the Turbo and the Supercharger at once? I remember seeing a VW that did that a while back. It had a monster turbo and an M90 style supercharger to give it a little more kick low end due to the turbo lag. Now I realize that would take a serious motor to handle that but couldnt it be done?

[John D.]

<blockquote>quote:</font><hr>Originally posted by Jason:
Couldnt you run the Turbo and the Supercharger at once? I remember seeing a VW that did that a while back. It had a monster turbo and an M90 style supercharger to give it a little more kick low end due to the turbo lag. Now I realize that would take a serious motor to handle that but couldnt it be done?<hr></blockquote>


There is already someone running, or is trying to run, a setup like that on a Fiero with an L67 swap. He claims 10 sec times, I think, but hasn't been able to come with any slips yet.

If I wanted to get crazy I could go that route, but I want to keep it really reliable and I think a single turbo would be the way to go. I am kinda hestitant to follow this due to the loss of low end torque, cause I love that grunt off the line.

[MoreThanAV6]

The only way to find the best turbo is to decide what your hp goal is. Then use that to figure what psi boost you will be running. Next figure out what your max rpms will be. Then using volumetric efficiency along with the rpms and ci of the motor map the cfm (or lb/min) on compressor maps to find the best turbo for your application. There is no one correct answer, its all based upon what your appilcation is, so don't follow someone elses recommendation blindly. Buy a book and learn what is necessary for your goal.