I was thinking about twin 72's as well, but for the same money and spool, get bigger turbos? I need the high PR's to force feed two 70+mm into a single 64. Reason I was looking at the 87mm turbine was to actually take full advantage of the 78mm compressors, but it would obviously be at the loss of spool up with the bigger wheels.

Where did you get the 37 lbs/min figure? GT42?

 

Either Reed @ Exile turbos, or Jose @ Forced, in a YB thread, it was either 37 or 39 I couldn't remember for sure so I cautioned on the conservative side.

 

I think both the 64mm secondary (even with the A/W interstage), and the head, will both run out of flow, before the 83mm turbines. There is significant spool difference between the two turbines as well.

I think there are several bridges to cross before you need the 87mm+ turbines, to take full advantage of the 78mm compressor wheels. At this point the extra 6-8mm on each compressor would be as much for show as for go.

If you were willing to entertain a little spray, then I would have a different opinion...


As far as the 64, I definitely think you should find a free float t4 housing for it. With that being said I might have one on that S360 that needs to be rebuilt. Iirc it has a .91 divided on it, we just need to see if they have the same size turbine wheels. Or build a real hybrid out of the two...

 

Just a thought... Since installing the injectors is independant of turbo's perhaps installing the larger injectors AFTER the twins might be best.

Break the new turbo's in nice & easy with the stock injectors? Plus if any issue comes up it will be much easier to diagnose.

If not, I would install the larger injectors a couple of weeks before the new turbo's. Turn down or turn off all programming & just run them.
Again if any issue comes up it will easier to diagnose rather than making many changes at once.

IMO, the less changes at the same time the better. I've had some bad history with my Mustang when I made a ton of changes at once & then ran into issues which were difficult to diagnose.
With my truck, I've tried to not to make the same mistake.

 

Ya, I guess I can install them and set my Smarty back to stock. Shouldn't hurt anything if I pay close attention. I have new 90hp DDP tips if you guys know of anyone who is looking for a set?

 

To drive the 78 to its full power, I think the 87mm would be the ticket. That being said, it may never get driven to its full power if there is two of them, making the 83mm the winner. If 72's is the way, no question, 83mm.

I was also thinking about the T4 housing for the 64. If yours is a 71mm turbine, then we'll be good to go. With a 60mm comp, I'd guess it would be a 65mm. Something to investigate when I return home.

 

It was off a genset so it might be a bigger turbine then a 65, as spool up really wasn't a concern, but I really don't know at this point. Never bothered to measure it.

Lightweight 72's would really be the ticket if there were such things. Did you see Trent Nell's new triples?

 

How would you rig up the triples? You probably need at least two decent sized external gates, probably run out of room if you want to leave on the hood. Not sure how well the triples would work if you move them up front, like an outlaw gaser.

I vote for the S400, 83 on a T-4 turbine housing. Like Brett said, if you run the larger turbine housing/turbine wheel, it might be abit big and laggy. Of course abit of spray would wake them turbos up to burn all that fuel. The real trick is getting everything to flow air. Once you have that you'll make tons of power.

The S300, T-4 flange stuff is fairly cheap, most of it is less than $1000.

 

Hey Brett and Mike, how are things going? How's the other build going? Just wondering a time frame to get my truck down there?

 

It figures Mike has been off work for 8 months straight, we get the parts and he has been gone ever since.

Looks like it will be the first week after the Canada Day long weekend now. Before we start the other build. Well as long as Mike get home, it was supposed to be a few days, that has turned into a few weeks. The nice thing is at least we finally have all the parts, and they are correct, so it should only take a few days once Mike is back.

I possibly maybe borrowing a friends '06 on the Canada day long weekend to mock up both sets. If he comes through, I will get both sets tacked and ready for test fits, and then it will be a very quick procedure from that point. (Test fit, make any adjustments, weld solid, send for powder coating / ceramic coating, install, tune.)

So for a time frame. IF*** Mike is back before the Canada day long weekend, we should be able to do the tacked test fit on your truck on either Saturday July 9th or Sunday July 10th (whichever works for you) and then the full install either the weekend of July 16th or the weekend of July 23rd, depending on how long the powder coating / ceramic coating line up is at that point.

Mike going back to work has pushed us back about 2 weeks, and unfortunately twin builds only keep us in beer money so we both have to go to our jobs when required. Our original timeline after we got some parts supplier issues sorted out was we were supposed to do the mock up on the other build last week, and install this week, and hopefully mock up yours this weekend.

Thanks for hanging in there, these two builds are our top priorities, after our real jobs. I am anxious to knock them out and be able to get a summers worth of towing review out of them.

 

I will be doing my big trip out to the coast and i need the twins for that journey.

We leave July 31 to Victoria. I hope to have her on before then, PLEASEEEEEEEEEEEEEEEEEEEEEEEE?

 

I should be released from work this week. I'm still waiting for Steed for one of the manifolds. He should be done this week or next. He's been busy.

Ya work funny, go to xyz pump station for two days, turns into 3 weeks. At least I have some money now.

I can't see why we could have a set done for your trip. Might not be ceramic coated for the trip out, but I can at least get your powder done and VHT the turbine housings so it looks decent.

Like Brett said, we have most of the parts just sitting in my garage.

You going to Vic, I would book your ferry time ASAP, gonna be busy hauling a trailer. Nice trip, done it a few times. You going up Island or just hanging in Vic? I'll give you some cool hanging spots (aka micro brew houses/fresh sea food restrants). Vic is one of favorite places for food and beers. mmm, now I'm hungry and thirsty.

 

I would put the injectors in at the same time, turbos really don't need much of a break in period. All you just need to add some pre-oil, just for start-up. After that lay down the throttle. Just hopefully those head studs are tight, might see 60-70psi fairly quickly.

 

LOL, I knew you would say that! Or is that a 2 truck guy thing?!!


I'll continue to be the conservative guy though.. I was raggin on my Stang last week, which is actually on the road this summer, & I was thinking that if I broke something it would be no big deal.
Flat deck it home. Roll it into the garage & work on it when I feel like it.
No wifey repercussions, unlike the truck.. We just got back from a w/end of camping near Rocky Mtn House, leaving this Friday with the RV in tow for a week in Saskatchewan.

Our usual 3 weeks of cruisin around B.C., also with the RV in tow, in August. I can't afford not to take it easy on our truck in the spring & summer.
Hopefully back on the dyno this fall though. If anything were to happen at least camping season would be over.

Jamie is going to be extremely happy towing with twins though.

 

My 02 is broke right now, just pouring the miles on the 2010 truck. Hate to say the stock tires just don't work in mud very well. Were I been working there is 40-50miles of gravel to drive, with all the rain, its been fun.

Wish I had a truck like Jamies for my gravel driving. Some pretty deep ruts going into the site. So far the truck has handle the roads like a champ.