Originally posted by FrostKing:
The front mount has been the best investment on this truck so far.

You know I've gotta ask FrostKing. Especially, since your the one who influenced me to start some turbo mods. And your the one who told me about the T76 turbo would work great with the STS systems with the 5.7 or 6.4 Hemi engines. Your modded STS 3" exhaust piping was very cool.

I've been looking to build a front mount turbo for my truck. One that would work with a 5.7 or 6.4(5.7 Hemi engine block). Any suggestions on this subject would be highly appreciated.

Thanks FrostKing.

 

Is a 76 any different dimensionally than a 70? I wanna go to a 76 but i'm afraid ill have to modify my down pipe to make it fit

 

If you have a 3" down pipe, it will work Austin.

As far as the T76 turbo, we'll have to ask FrostKing what size A/R exhaust housing he's using on his front mount turbo 392 stroker. And how well it drives on the street with that size A/R exhaust housing.

 

Originally posted by Ghost03hemi:
If you have a 3" down pipe, it will work Austin.

As far as the T76 turbo, we'll have to ask FrostKing what size A/R exhaust housing he's using on his front mount turbo 392 stroker. And how well it drives on the street with that size A/R exhaust housing.

My current turbo is much too small. (HP-72 with 68mm turbine, .96 A/R) Seems that a .96 is the most often used size on V8 street setups, regardless the compressor size so I would think a T76 with with a .96 housing with a 5.7L engine would be excellent for mid to high RPM torque. Low end torque initially sounds fun, but it ends up being extremely boring when it won't rev past 5000 as is my situation right now and is too touchy for everyday driving.

Once you get over a T76 then the down pipe will start getting larger than 3", unless you look at Borg Warner stuff which is twice as big as everyone else. (for the same power output) If you have an exact turbo model in mind, I can graph it is see how it will run.

 

Originally posted by FrostKing:

Originally posted by Ghost03hemi:
If you have a 3" down pipe, it will work Austin.

As far as the T76 turbo, we'll have to ask FrostKing what size A/R exhaust housing he's using on his front mount turbo 392 stroker. And how well it drives on the street with that size A/R exhaust housing.

My current turbo is much too small. (HP-72 with 68mm turbine, .96 A/R - 850HP rated) Seems that a .96 is the most often used size on V8 street setups, regardless the compressor size so I would think a T76 with with a .96 housing with a 5.7L engine would be excellent for mid to high RPM torque. Low end torque initially sounds fun, but it ends up being extremely boring when it won't rev past 5000 as is my situation right now and is too touchy for everyday driving.

Once you get over a T76 then the down pipe will start getting larger than 3", unless you look at Borg Warner stuff which is twice as big as everyone else. (for the same power output) If you have an exact turbo model in mind, I can graph it is see how it will run.

 

My current Turbonetics HP-72 would be great on a stock Hemi engine.

 

I've talked to several perfoance places and they all tell me a borg Warner s475 with a 1.1 a/r would be perfect. Not near asuch heat and they say I should be at full boost by like 3200. Eventually I wanna build a motor to handle a good amount of boost. Damn stock Chevy 4.8l will take 18psi with w/m and a good tune. I'd love to run 18 psi lol

How u think a 5.7 based 370 with an s475 on a 1.1 a/r would work vs a 76 .96a/r? I'd like to rev to shift around 6500.

Driving with the 70mm is definitely touchy, I have to always drive like a granny to stay out of boost, thought it would help mileage but nope.. 11mpg

 

I'm sooooo much more pleased with the .96 installed now.

Better "street ability" all the way around.

 

That's great to hear Bill.

 

Originally posted by Carrolls Ram:
5.7 based 370

 

Originally posted by Carrolls Ram:
Driving with the 70mm is definitely touchy,

The turbo that came with the STS kit was a 60mm. It had a .81 A/R exhaust housing. Talk about touchy.....

 

Here's the difference between the 60mm and the T76.

 

Now I can see why you like it Stu...It Shines...

The 60mm looks like it came off of Phil's old Geo...

 

And you can go with a bigger turbo exhaust pipe.

IMPORTANT NOTE: You have to leave 12 to 18 inches length of the three inch turbo exhaust pipe. The three inch turbo exhaust pipe size and length does help in the turbo's exhaust housing performance.

Here's a pic of my turbo exhaust pipe mod going into the SRT10 tail pipe. The 4 inch exhaust pipe allowed enough room and flow for the W/Gs to dump into it without affecting the turbo performance as well as keeping the truck stealthy.

The 4 inch pipe also helped out in the exhaust flow into the SRT10 twin 2 1/2 piping.

 

Originally posted by VA4MEDS:
The 60mm looks like it came off of Phil's old Geo...

Don't give Phil any idea's.......

I still have the 60mm turbo.

 

This was before the 4 inch turbo exhaust pipe mod. The turbo performance was noticeably better at the top end after the 4 inch exhaust pipe mod. The turbo also would boost up a little quicker too.

 

And the second W/G piping mod allowed smoother boost control by bleeding off back pressure from the 3 inch pipe as well as from the STS W/G pipe. Also assisting in the VWG testing.

 

Looks good Stu. My problem with running a bigger down pipe is contacting the firewall. I dont think I can fit one between the headers, frame and firewall. Would probably would have to cut the firewall and weld a new piece in for it to clear.

 

Sorry....

Can you run twin 2 1/2 pipes? Some of the ricers have to do that to clear the frame.

 

Maybe? Idk I havent gotten under there in awhile lol. I wish the bolt pattern of our headers were the same as a chevy, I could build a header with primaries that are much closer to the head to potentially give me the space to run a 4'' down pipe.

BTW, truck is doing the popping crap again under full boost.. Its on its period again lol. Darell said spark blow out could cause that. Plugs are at .035. Thoughts?

 

What plugs you running and max timing?

 

NGK 4306s and not sure on max timing. IEMS3 does timing based on MS and i've got timing pulled from the stock tune. My other laptop is dead with the software on it so idk how many MS of timing i've got pulled. As for max timing, dunno that either. Can I log max timing with diablo?

 

Are you still using the IEMS3?

How many miles are on the spark plugs? Unfortunately, the spark plugs need to be changed more often in our turbo/supercharged engines.

 

yep. Havent changed anything in the tune. I'm gonna try and use my gopro camera on the way to work tomorrow and see if I can get it on film

 

Did you check your IEMS3 connections?

It has to be something simple and hard to find. It doesn't do this all the time right? Only every once in a while?