Sonic 600...my quest for a 600rw eaton combo. yes I said eaton

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Freakingstang

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back story: I bought my car years ago stock, with an exhaust. Added a few things to it, like a 2.65 motoblue upper, accufab SBTB and plenum, bassani 5 piece X. changed out the borla Stingers to bassani. changed out some ghetto cold air when I didn't know any better to a jlt. Car made 474/495 on a DJ in 2008. car ran 11.80's consistent at 117.5-118.5 on 18" kdw2's. eventually got it down to 11.66@ 119. highest mph was 120.6. that is a full weight 03 vert, 6 speed and IRS. Never launched on good tires or above 1600rpm due to the IRS not being built. It was a street cruiser, nothing special when everyone was running 10's at the time. Blower had never been off the car and it only ever had an upper only on it.

I bought a polished used steg mystery port. someone ran it without oil and chewed the gears up. bought another blower and installed new rotors in it. never had the car dyno'd at this point, but had a mail order tune (circa 2009) car lost tq and mph was 124ish... pulled the blower off to send to posi, but he didn't want to waste a race port on the hacked stag blower. the outlet was so huge it wasn't worth messing with. I put things on hold for a few years as life happened and it got put on hold. I almost sold the car a couple of times to help pay for a house down payment........when I finally got back into it, posi was done and some people were stealing his work and all those awesome helpful DIY pics were pulled down.. I talked with Brian numerous times about DIY porting and this lead me to do my own.....

Anyways, I had a couple blowers, a buddy had a screwed up case and I just started playing with it and toying with the idea of welding some here and there to make use of the blowers I had. I used the junk case as a test mule to see where the limits of the case were and started welding with archaic aluminum stick rod. it works, but it is not pretty and quite the pain in the ass to work with. you have to grind the flux off after each weld..

now, since posi had been around, the dragon TB was the only one to use in many peoples eyes... there was two reasons for this. the TB was the same width as the accufab tb, but the height was taller. it looked like a football compared to a oval. the biggest restriction with the reason the accfufab didn't make much more power than the ported stock tb was due to the plenum. the stock and accufab plenum ended at the edge of the bolt holes in the case and there wasn't enough material to flow what the blower needs. the dragon plenum goes to the edge of the blower case. side by side, the accufab flows 3-5 cfm less than the dragon without a plenum attached... with the plenum attached, the flow decreased on the accufab by almost 50cfm... that's why the dragon was always the highest producing tb out there...

My goal is to make big power with an eaton and using an accufab tb... I could have just done a H122 swap, but didn't want the look of the passenger side blower, also didn't want to buy a stupid expensive adapter plate (8-900 at the time) to run it. And I'm just stubborn and don't think anyone has completely tested the limits of the m112, plus it was a long time goal to make more power than the pathetic steg port.

so here goes, there will be lots of pics.

first was some outlines. The dragon is not marked in this picture but the dragon plenum edge extends the the edge of the blower case. the dragon inlet is the size of the posi outline. (thats how it was traced off of a posi ported dragon)

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I welded a chunk of aluminum to the right side of the inlet.. in this pic steg mystery port on left (stage 2 or stg3) compared to my hack job. I wasn't worried about the appearance of the weld as it would be ground down to resemble stock when it was all said an done..

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after lots of cutting, I popped through a couple places, so some weld was added to the outside of the long turn radius

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I also popped though the bottom, trying to cut the lead in as deep as possible... a little weld was added...

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at this point, with is a rough outline of where I was at

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or in a better perspective.... accufab gasket:

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I knew I'd have to modify a plenum, I just didn't know what I wanted to proceed with. I bought another accufab plenum, a vmp plenum and a H122 (gt500 commonly called m122) plenum..

VMP mysteriously fits the same pattern and profile.... hmmmm

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I also picked up a h122 blower, so I now had the m112 inlet, h122 inlet and vmp to play with..

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Freakingstang

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after some high tech sketches and measuring it seems I need to make something other than whats relatively available...

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stock 07-10 h122 plenum vs the accufab...

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I wanted to make the VMP work. This seemed the most logical and was also the largest... but there wasn't enough meat in the case, even with welding the underside to make this feasible.

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this was TB side of the GT500 mono blade.... compared to the accufab...

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inside dimensions of the GT500 plenum against the accufab..

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this is the size difference between the accufab and the gt500 mono blade....

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more high tech drawings.....

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so I started cutting... if I could keep the accufab SB inlet size the whole way into the blower, it will be more air than either the ported dragon plenum or the ported H122 plenum could flow...

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cut the H122 also...

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rough layout of the two large ends put together...

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Freakingstang

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new plenum compared to a welded accufab.....

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oh yeah, its big...

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since some people have midget hands, how's this?

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and compared to a welded accufab.....

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the inlet was welded...

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more weld was added so it could be ground smooth and remain stock looking....

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weld was added to the short turn radius so I could take the bend out of the inside...

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Freakingstang

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its starting to take shape...

4A07908F-4650-44A1-978E-D039870CDEF0_zpsxsguj8ox.jpg



now, about this point I quit working on the 100K mile scrap case and started with a 4K mile case I picked up... this one was going to be the for real case.

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blocks were welded underneath also (pick has oil on it but was thoroughly cleaned and ground before welding...

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lots of weld added to outside of the blower case on the passenger side long turn..

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Freakingstang

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so we went to work.... grinding, welding, grinding, welding....

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at this point I said, why use the little m112 rotors since I have a H122 blower sitting here....

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the rotors fit in the case, but the are .750" longer.... hmmmmmm

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Freakingstang

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look at the lead ons on the H122 (top) compared to a hogged out m112....no wonder they make more power than the hybrid rotor swaps.....

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I started researching m/h122 rotor swaps and hadn't come up with much.... seems there had been a few sold by steg, but no real numbers or times....



If a H122 blower on our cars makes 530-550 unported, then 580-620 fully ported and pullied, why I couldn't I make 575-600 doing my abortion blower......

so I needed to make a spacer....

I used the rotor pack plate from the screwed up original ported steg rotors as a template

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used a 3" hole saw to get rid of most of the material..

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put it in my table top mini mill and went to town...

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Freakingstang

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Now I ran into a issue..... to use the H122 rotors in the M112 case with the adapter plate, you have to use the h122 snout...

well when I made the first spacer, I used the m112 rotor plate as a template. it has two lower holes... the H122 only uses one lower mounting bolt (all the side and top bolts line up).

so I was in a pickle... Luckily I bought a two sheets of .750 aluminum off ebay when I started... there wasn't enough material in the m112 case to drill and tap a single lower snout mounting hole... so I used the h122 rotors as a template and started over. the new spacer would be threaded for the lower bolt in the nub that protrudes into the rotor pack plate....

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so off to the mill we went again... urgh... part of hot rodding is trial and error....

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Caleb Naasko

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All I can say is wow! Quite the shop and skills you have. Can't wait to see this project come along!
 

Freakingstang

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Its been a long process, I don't have a "shop"... I have a table top chinese mini mill, a stick welder and some buddies with tig welders..... I'm just an old skool DIY hot rodder. I'll post more pics soon, It's almost done, the car needs upgrades to handle the blower. Hopefully in the next month or so it will be on the rollers. I'm up in the air on a fuel system as I can't swing a return setup right now and I'm afraid my upgraded GT pumps, and BAP won't support my goals of spraying it 100 shot...

I still have to figure out what hub to run with the new snout, and I have a dragon TB and plenum coming to modify incase the accufab doesn't cut the mustard
 
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cj428mach

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Neat project, I hope you hit your goal. I've only been on svtperformance for a few years but I was always surprised not to see someone with the tools and time to take on a project like this. Now I finally have.
 

Freakingstang

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steg inlet....

C87CBD64-5001-4A21-B2DB-F8686D307F82_zpssj9ckb8y.jpg


my inlet that still needs finished...

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steg lead ins...

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mine

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mine on top, steg on bottom

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the inlets.... (still needs finished)

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yeah I have a couple laying around....

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now the outlet needs work since the rotors are pushed farther back towards the snout....

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MineralCobra

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Thats some creative work right there... I have a question. With the adapter plate and longer rotors does the snout pulley line up with the rest?
 

Bdubbs

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I probably missed it, but I'm guessing your running race fuel or e85? I have mixed views on bigger inlets and TB. As I have the GT500 setup and didn't make anymore hp than others running smaller inlets or dragon/accufab tb's,
 

Freakingstang

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The snout is 3/4" shorter than the m112 snout. I have emailed and called steg five times and no response or call back about his "custom hub" for billet flow pullies. I can use the stock BF hub and space it where it's needed but won't know for sure until everything is bolted together. I've called James at cobra engineering and he offers a couple hubs. I won't know for sure until it's all together. That's the last of my worries right now.
 

Freakingstang

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I probably missed it, but I'm guessing your running race fuel or e85? I have mixed views on bigger inlets and TB. As I have the GT500 setup and didn't make anymore hp than others running smaller inlets or dragon/accufab tb's,

You won't if you aren't spinning it. Most vmp combos make 640-650 on 93.
To prove your theory wrong, look at the vmp tvs vs the Shelby tvs on our cars. The vmp inlet is twice the size. Most Shelby vmp's don't crack 600 while the vmp (with a 2.4-2.6 upper) makes well over 650

A roots blower doesn't compress air. It moves air. It is a giant "blower". It can only flow as much air as it can take in.
 

Bdubbs

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You won't if you aren't spinning it. Most vmp combos make 640-650 on 93.
To prove your theory wrong, look at the vmp tvs vs the Shelby tvs on our cars. The vmp inlet is twice the size. Most Shelby vmp's don't crack 600 while the vmp (with a 2.4-2.6 upper) makes well over 650

A roots blower doesn't compress air. It moves air. It is a giant "blower". It can only flow as much air as it can take in.

IMO those are happy dynos. With stock manifolds and 18 psi, 20 degrees of timing I made 576/528 on 92 octane. Most guys around here on 2.3 blower with e85 and 21-22 psi make 650-670. Every dyno is different I suppose.
 

Freakingstang

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IMO those are happy dynos. With stock manifolds and 18 psi, 20 degrees of timing I made 576/528 on 92 octane. Most guys around here on 2.3 blower with e85 and 21-22 psi make 650-670. Every dyno is different I suppose.

I knew there would be negative nancy's. If a tough feat to accomplish. since we are talking dynojet numbers, I would light my car on fire if I spent $4K on a blower and made 26hp more than a posi race port with an upper and lower on 93. That's another reason for this build. 20 degrees of timing is low. pretty muh standard timing is 23 degrees for an eaton equipped car. There are more than a couple 540-550 rwhp and twtq posi ported eatons. A good friend has a little ole vmp on his yellow cobra. makes 656 SAE and traps 138. 4lb lower, longtubes and a 2.6 upper. what does your underperforming combo trap?
 
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