I was talking about josh Lester. I forgot about the black cutlass with the pro charger but Josh also runs pro chargers.

 

I received another piece of the puzzle today. It’s a Forced Performance HD 80/85 T6 turbo. I also called BTR and he is hoping to have bearing spacers in a few weeks. I’m hoping to start machine work on the block by the beginning of the year.

 

 

Agreed! Awesome news!

 

Cool I am following along.

 

Glad to see you're making progress. I'm curious how you decided on that 80/85 rotor group? It might be a little small for your build. That is, you'll have to wastegate early so as not to overspeed the turbo. If that engine breathes as well as it sounds like it's going to, you could take advantage of larger comp and turbine wheels.

 

What stroke is that moldex crank? And you said dx...what lifter are you planning on running? I've seen people use the .921 stock rollers, and I happen to have a set of schubeck ceramic .921 flat tappets.

 

I picked this turbo by doing research on sub 400 ci engines. I wanted something that would spool off the footbrake and be capable of 800 hp. The plan is too get my feet wet with this combination, run dragweek and if I decide to upgrade this turbo will work well in my ls swapped C10.

 

It is a 3 5/8 inch stroke crank. We have not got to what cam I will use yet. I am thinking about using the solid roller that is in my 461 currently. I plan on calling Bullet cams and talking with them about possible cam specs. My machinist is looking at rod and piston combos to give me a few options. We are shooting for 9:5:1-10:1 compression.

 

Boogie, I think you went a bit big on turbo and a little to high on compression goal? I posted a reply but it went to the wrong thread:

https://classicoldsmobile.com/forums...-build-167137/

I would use this On3 turbo that is a 76 and will support 1125Hp

https://www.on3performance.com/shop/...harger-1035hp/

And look at Frozen Boost for intercooles and stuff:

https://www.frozenboost.com/

 

I have experience running a similar turbo on a 325 cube ls motor....T4 flange and same .96 ar. It definitely has backpressure issues coming up on 20 psi....over 2-1 ratio with an open exhaust. I data log backpressure. The last thing you want is a turbine limited unit, good way to start hurting parts. I feel the compression is totally appropriate. Even on pump gas. If this is going to be on race gas or e85, you can pump the compression up even higher in my experience.

 

what we find, on street motors is that lower compression works better and move forgiving to parts and tune. 8.0 is more forgiving tune than 10 to 1. And if the turbo is only going to support roughly X amount of power anyway, one runs better with street stuff with lower comp and bringing in the boost to compensate. But there are TONS of ways to go and most will get to the same or close results.

MOST of the guys I know on these mild builds, (MILD PARTS WISE) usually make 1000+Hp with 75 mm stuff for street drivers. These are usually 8 second, 3400 lbs or more that are pump gas.

 

Send me a message of these guys please.

 

Maybe get with someone like Greg Powrie for advice and tune???

 

My flanges came in yesterday. I made it out to the shop for a bit to start some mock up on the manifolds. I’m still playing with a few ideas.

 

I picked up another block, 4 bolt main caps, and bearing spacers from 68 Post over the weekend. I got them dropped off at the machine shop, they are pretty backed up but he is going to fit me in. I am hoping to have the engine back in April. Until then I will keep working on the headers and hot side turbo piping.

 

Don't let any of these guys tell you 8s is problem with a turbo, because it can easily be done with all production parts, except maybe the rods.

 

If you ever want to sell those lifters, I'm a buyer.......

 

Make sure you come on here, I enjoy reading about your NA progression using production parts. Theres some good lessions to be learned from your low buck approach. Not to change the subject, but I did get my NA fuelie headed flat tappet 350 in my truck, you are now looking at my tail lights, you better step it up!

 

Production cast pistons and a turbo?

 

Nice build, looking forward on the progress.
What fuel do you want to use, pumpgas or E85?
Going for 1 or 2 wastegates, intercooled or non-intercooled?

 

I haven’t decided on fuel yet. I’m leaning towards e85 and non inter cooled. I am waiting to hear back from the machine shop on some piston choices to determine compression ratio. I have 2 waste gates, 1 for each bank.

 

What is your final bore size ? If he has it cleaned and machined lets see those block pics !

 

You’ll have to order a custom one I’m sure.

 

That should be a good and clean set up. Turbo in the middle in front of the engine with the charge tube directly to the throttlebody.
What EFI do you want to use? 8 injectors in the manifold or just a throttle body EFI like the 1200HP (=800HP on E85) from FiTech of Snipper?
2 wastegates sounds like more then enough to control the boost.

 

I will most likely use an elbow and ls style throttle body with injectors in the intake. I have some 3/16’s aluminum sheet so I am going to talk to my buddy about building a sheet metal intake similar to the Holley low ram intakes. It all depends on how busy he is and what he will charge for it. If he can do it for 1,000 or less I will go that route.

 

Cool project! Boost is very addictive. There has been a lot of great advice already so I don’t have much to add... with turbos the easy part is making the power, the hard part is making the trans, rear ends, etc all live.

 

I am really wanting to see these welds on these parts. This build is really interesting. Keep posting all the updates.

 

A few updates to post, unfortunately i have not heard back from the machine shop in a while. I am hoping to have the engine back by the end of April, I know he is swamped so I am trying to not bug him. I did get a Victor intake, Summit has them again. I got the passenger manifold tacked up and turbo placement figured out. I am fitting and tacking everything and my buddy that is a pipe fitter is going to weld everything together. I am going to convert to a manual rack to eliminate the steering box and pump. I will need to figure out a passenger side alternator set up.

 

That is looking good!!
Do you want to make a support bracket for the turbocharger (like the V8TV build) or have the complete weight of the turbo on the manifold?
Take your time to get everything positioned correctly, install all the components like radiator, alternator, etc. before starting on the pipe routing.
The wastegates can become a bit difficult sometimes but it depends on if you want to have them open or routed back into the exhaust system.

On my racecar I moved the alternator from the passenger to the driver side and changed it to a small 40A unit from a Kubota digger.

 

Some more mock up picks. I have a brace on the flange temporarily. I will be using a Maven mount attaching the turbo to the block. Driver side is up next.

 

Awesome!!

 

Cool stuff.

 

I stopped by the machine shop this week and they have not started on the machine yet unfortunately. I did get the manual rack installed though. Now I can finish the drivers side header and hot side mock up.

 

When i installed a torq storm SC on my BBO i used a stock trans am (403) alternator mount and pullies that puts it near the middle right side front of block and the belts worked.

 

Update time, I stopped up to the machine shop a couple of months ago and they had not started on anything yet. So I decided to drop off a gas block as that will require less work to get together. I am still going to build the diesel block but I will find another shop for that. The gas block has been bored, pistons are ordered and should be here in the next week or so. Hopefully I will have this home early January. More details to come.

 

Looking forward to your progress and more pics!

Thanks for the update here.

 

Update: the machinist that was working on my engine passed away last week. So I stopped up to the shop and talk with the owner. The reason this build has dragged on is the crank is not a 3 5/8 stroke. Turns out it is a 3 1/4 stroke, so the rods and pistons he ordered are wrong. At this point I am probably just going to get my parts and money and figure out what to do next.

 

Bummed to hear that about the machinist passing away.

Also sucks about the weird stroke on the crank….

but, it would be great to limit torque so you can keep traction and give you more powerband once on the boost.

Would any custom length rods of 6.1875 length be affordable enough to keep the pistons you have now?


Or, are you better off selling the pistons, keeping the rods, and getting new ones to do what you need for compression changes and stroke?

 

Looks good, hopefully you get it all figured out.