s60 VNT

[qzone83]

Does anyone have a clue as to where I would find a S60 VNT turbo either new or used?

[Harvii]

fwdperformance.com rebuilds VNTs with a larger T-28 wheel and machined housing.

Harv

[Will Martin]

Yeah, but I think he's looking for one like this

[qzone83]

thats exactly what i'm looking for. now if I could just find one that would be fantastic. I contacted turbos unleashed to see if they could build one and I also contacted TEC to see if they could, no one has responded. It looks like the same exhaust housing mated to a bigger compressor so I dont see what the problem would be.

[Will Martin]

Well I can tell you that it's not all that complicated. When I took it apart to change out exhaust housings (the old one had a little bit of carbon build up and the new one was clean), I was amazed at how simplified it was. I honestly think it's really simple to make. You'd just have to get it balanced if it wasn't already.

[ludwig340]

If you e-mailed TU, just pick up the phone. Chris is pretty easy to get ahold of and he'll definitely take the time to talk to you and let you know what they can (or can't) do for you. Not trying to sound like a commercial or anything, but I've experienced the e-mail turnaround myself, and speak from experience!

[90DodgeVNT]

So they just fail from the additional weight?
Interesting...


Here is an e-mail I had with John Craig from Limit Engineering some time ago:



Mike,

I don't know which compressor wheel your turbocharger builder used. I looked at some
TB03 (same as T28) compressor figures and I still don't think you have a problem as long
as your turbocharger builder did things properly. At 24 PSI (2.63 pressure ratio) I estimate
that your turbocharger is turning about 150,000 RPM. If the turbocharger is balanced
properly, RPM is not the problem. As boost levels rise, thrust increases. Stock thrust
bearings are easily over loaded. If your turbocharger builder didn't use the proper thrust
bearing, then you have a failure waiting to happen.

It makes sense to me, that your boost increased after changing exhaust pipes. That turbo
was designed to run with a specific amount of backpressure. By changing exhaust pipes,
you removed that backpressure.

What do you mean by "clipped vanes"?

Regards,

John



To: johncraig@limitengineering.com
Sent: Wednesday, December 31, 2003 12:12 AM
Subject: Dodge VNT Turbo


John,

I spoke to you a few weeks ago about a few technical questions on VNT25 Turbo for my 1990 Dodge Shadow VNT. This is what my setup is currently running:

-Ported intake manifold
-ported exhaust manifold
-52 mm Throttle body
-VNT25 Turbo (modified to VNT28...larger compressor wheel, clipped vanes)
-full 3 inch exhaust
-Adj. fuel pressure reg.
-Ported head w/+1 mm valves
-cone filter

Since I dropped in the 3 inch exhaust, the boost jumped from 16 psi to about 20-24 psi. I was told by the company that built the turbo that going over 18 psi with the turbo would basically make the turbo overspin and destoy the shaft. I did a little research and called a few other Turbo shops and they pretty much told me that the shaft speeds at that boost level would be well over 180k rpm, and that it would lead for definate turbo failure. You were the only person to tell me that the turbo would not grenade, and that I could run the boost right up to 30 psi without any problems as long as it had a good supply of oil (I run Mobil 15w50 synthetic) and a good supply of coolant.

In talking back to other Dodge VNT Turbo owners on Turbododge.com, I was pretty much told same thing and that I should look to finding a way to get my SBEC reprogrammed, or find a way to limit the boost. Are there any technical reports or any type of documentation I can find to disprove all the naysayers, or can you tell me of anything I should or should not do with this engine setup? I have to say this car runs great and is a blast to drive, but I am concerned on the turbo not lasting....


Thanks for your help or any guidance you can supply.

Mike

Now I am not certainly knocking any imput from a turbo builder, but for a long time now, I have yet to hear anyone agree on the VNT turbo and acceptable boost levels. I just talked to TEC the other day about the S60 (or S62 if you will) and asked them the same questions and I was given CFM for the upgraded turbos and the overall boost they would run would be 25 psi on a VNT28 and over that on a S60 or S62. I asked about shaft speeds, etc. and I got the same response as I did from Jon Craig some years ago (good oil and proper balancing, etc.) I was told the Super60 (or 62) would push in the 260hp range but was not told of a boost level/pressure. I know Neil E. was heavily into the VNT stuff, maybe he and Will can add some here.

[qzone83]

All this info is great and it is making me want an S60 VNT even more, but no one seems to be able to tell me where to get one, any ideas?

[sleeping8t7]

I want one too damnit!

[90DodgeVNT]

TEC makes them, or at least something similar called the Super62VNT. I think it's the same thing that Will is running but I have no pics. I just talked to them last week...waiting for a callback on more specs, etc.

Price is approx. $1100


Meanwhile I wrote John Craig from Limit Engineering about all the Super60VNT talk and am also waiting on feedback about some of the information being said about VNT"s lately.

More later...


**Maybe we can get this thread moved to the VNT section** ???

[ironbird720]

any more info on the super60(62)VNT's??

[90DodgeVNT]

I wrote to John Craig @ Limit Engineering twice and never heard back from him.
In my follow up phone call, I was given a # to another turbo place that does VNT work. Price range I think was in the $600-$800 range with a good VNT core. I need to follow up with in both by phone and e-mail for all the specs and such, but that probably wont happen till Tuesday.

[qzone83]

hey, whenever u find out about the other place that does vnt work lemme know, i think mine is starting to crap out.