High HP with a Targa car

[GQ NSX]

As you all know, some pretty great numbers are being produced with the advent of these remarkable turbo systems. I know that the coupe is a much more rigid chassis--but does it really make that significant of an impact if someone was to go with a high psi turbo kit on a targa NSX? I remember hearing or reading somewhere that if someone was going to go with a high boost setup that the coupe is recommended. Just wondering if you guys can chime in your thoughts about stability, traction, and feasibility.

Regards
ravi

 

[akira3d]

Ask forum member SpeedDemon (Marc). He drives a twin turbo NSX-T.

 

[Black&Tan97Tnewportbeach]

Well, in the next few weeks we will have a relatively high boost , that is to say 8-10 PSI DONE RIGHT with aquamist, standalone, and intercooler. That should certainly be the highest HP\Torque T in town, I will let everyone know how it is.

With the NSX-R front brace and PROPERLY filled motor mounts, it should be pretty solid with this medium boost setup. Now 20 PSI that might just be impossible! (not that I have a built block, just hypothetically speaking)

 

[Larry Bastanza]

With the NSX-R front brace and PROPERLY filled motor mounts , it should be pretty solid with this medium boost setup.

Dude, you have got me stomped. Filled M/M??

Please comment.

Happy Holidays.
LarryB

 

[ncdogdoc]

Larry,

I am guessing he is going to fill the mounts with urethane or some other stiffening agent. It willl flow around the stock rubber piece and make a very solid mount.

 

[ak]

I think NSX-R uses stiffer engine mounts if you can find one.

BTW, I think NSX-T chassis was designed to be as rigid as the older coupe, so much so that the '95(?) Le Mans NSX was based on the T body. I guess it still flexes without the roof....but theoretically it should be stiff enough?

 

[ncdogdoc]

I think NSX-R uses stiffer engine mounts if you can find one.

BTW, I think NSX-T chassis was designed to be as rigid as the older coupe, so much so that the '95(?) Le Mans NSX was based on the T body. I guess it still flexes without the roof....but theoretically it should be stiff enough?

I would agree that it should be stiff enough. The car with the top is as stiff as my coupe. Without it is another story, but still very stiff compared to the other open top cars out there. I am not really sure why it matters anyway???

 

[Black&Tan97Tnewportbeach]

Yeah, the motor mounts are like big rings with rubber going inward to a smaller hoop in the inside (or something). So they flex a lot when they are stock. Like they flex so much that when you torque out, the rear axles are going N\NE while the car is going North. (Thats the sensation anyway because the torque makes the whole drivetrain move several degrees clockwise looking down on the car). So the mounts need to be filled in when your gonna be puttin down anything over a minor upgradelike headers or something.

 

[GQ NSX]

If I understand correctly: The 95+ targa models were made to be just as stiff as the earlier coupe predecessors. In this case wouldn't that mean that a high boost, high power targa wouldn't have any real problems as far as traction/stiffness etc goes?

Learning a lot,
ravi

 

[docjohn]

From my limmited experience the motor torques front to back as if it were a rotiserie .I say this because when I put the dc sport 1st gen headers on the car the O2 bolt was aimed right at the fire wall.As we cut a piece of the wall away(to provide more room) we could see that the bolt was scraping up and down.The distance it moved was amazing to me about 1.5 cm!

 

[Andrie Hartanto]

The coupe will be more rigid than the targa period. It will be lighter as well. That being said, the Targa is not bad, and still plenty stiff. In fact the red car I drove in NSXPO'03 is a targa, and still was the fastest car out there.

The rumor is, the 600rwhp SCNSX in SoCal is also a targa.

Black&Tan97, who is doing this filled motor mount in the west coast. We are havng ours done, but by a guy in the east coast. Would be much easier if I can get it done close by.

 

[Black&Tan97Tnewportbeach]

Well it is part of what Gerry Johnson does on his Custom Turbo installations, I do not know whether he performs the procedure at his shop, brings them locally, or ships them out to a specialty operation. I'm sure he or someone who knows will answer on here. Hooay Holidays Everyone!

Wolfie

 

[Black&Tan97Tnewportbeach]

Oh Yeah and by the way, i think that more power is transmitted to the rear passenger tire than the other one with the stock differential or whatever it is, thats why that side always wears down. Therefore, maybe unless you have the LSD(?) , when you nail it the passenger wheel is putting more to the ground so thats why it twists the drivetrain clockwise . . (this is only a theory bu thats what it felt like running 10.5 PSI by accident with 440s when nsxm forst did my old turbo)

 

[Turbo NSX]

Well it is part of what Gerry Johnson does on his Custom Turbo installations, I do not know whether he performs the procedure at his shop, brings them locally, or ships them out to a specialty operation. I'm sure he or someone who knows will answer on here. Hooay Holidays Everyone!

Wolfie

Gerry fills them himself.

 

[GQ NSX]

So there is hope for the targa cars!

Awesome.

 

[KGP]

...Note: There is always a weak link. If you stiffen the bushings then everything else down the line get that much more stress. Usually means the tranny, which I feel is the weakest link in the drive train.

Why do you say tranny? Just a guess, or do you have some experiences you'd like to share?

 

[Larry Bastanza]

OK,

So we are talking about stiffer mounts. Seems to me these would not be too hard to do at all, just press out the rubber and install a nylon and/or delrin bushing, same as the modified rear beam. Actually, not requiring quite as much accuracy.

Thanks,
LarryB

 

[Turbo NSX]

I know there is a 540 rwhp SCNSX in San Diego that is a targa. I saw it on the Dyno and drove it on the track. It doesn't have filled bushings as of now. As for the filled MM you can buy liquid polyurathane at most industrial supply stores and fill them yourself. It is the same stuff everyone else is using. Real Time filled theirs, Off-road racers make molds for custom applications all the time with the same stuff. You can even get different colors!
Note: There is always a weak link. If you stiffen the bushings then everything else down the line get that much more stress. Usually means the tranny, which I feel is the weakest link in the drive train.

Oh please post the dyno plot I would love to see it. Let us also hear the details, How much boost? Compression, engine management, etc....

 

[GQ NSX]

Seems like all of a sudden these high hp cars (with sc's) are coming out of no where. Not to say they don't exist, but it has been my understanding that big numbers e.g 400+ hp on the NSX is mainly made using the turbo applications. I know some awesome numbers have been made with the 9 psi Comptech, and other manufacturers as well but these new numbers are simply staggering. Either way it is good to know that big numbers are being made with the targa--any ideas if he has traction issues etc?

I have a video of a silver CT widebody called "508 bhp" that I will upload if anyone would like to see. It sounds like a turbo (I can hear the blow off). Just like the others I would also like to see the dyno plot or any info about it if possible.

Regards:
ravi

 

[KGP]

Oh please post the dyno plot I would love to see it. Let us also hear the details, How much boost? Compression, engine management, etc....

I want to see them show up at the Factor X Shoot-out.

Seems like all of a sudden these high hp cars (with sc's) are coming out of no where. Not to say they don't exist, but...

Yea, all of a sudden. Details please! ECU? blower? Internal mods? Oh, and please don't tell me that one is 600rwhp @ 8psi.

 

[Elite]

The best stuff to use for filling the motor mounts is made by 3M. Its called Window Weld(black). They have other products with similar names... but this one is the best. I am out of the country right now and will be back in town by the weekend... but if anyone wants the part # I can get it for you. Its an easy job for any do it yourselfer. Mo - Elite

 

[Turbo NSX]

You act like this is an unreachable #. Maybe for a BBSC on a street car that passes smog, but 540 rwhp on a fully built motor with sleeves, cams, LC pistons, intercooler, SC, AEM and someone that knows how to tune it right, is not unbelievable. What is the Factor X shoot out?

Specifics please. How much boost, compression ratio, what compressor, etc.

 

[KGP]

You act like this is an unreachable #.

Oh, I know the number is reachable. I have felt it. Just not with any SC's that the NSX comunity might be familiar with. Or, better yet - not with an SC system that has been advertised for sale to the community.

What is the Factor X shoot out?

http://www.nsxprime.com/forums/showthread.php?s=&threadid=26884

 

[Turbo NSX]

Exactly!
The shoot out sounds fun. I will try to go. Is it on the outside track aka "Derek Daly" or the inside track with the infield. I don't do Drag Racing! If it is on the DD track cool. I hold the track record for a NA NSX and can't wait to see what I can do with double the HP.

As for technical data I will post it when I post the Dyno #'s

What kind of torque are you getting. When are you going to post the dyno's?

 

[KGP]

Is it on the outside track aka "Derek Daly" or the inside track with the infield.

I think they have to wait till after the first of the year to see about track schedule/availability.

I don't do Drag Racing!

But can you imagine all the smack talk in combination with legal gambling!

I hope I can make it and meet you.