Schnitz

Been away from the muscle car scene for a while while my kids were young. Just bought a '93 coupe like I had in 1999. This is my 6th Mustang. I always loved them because they were quick and they had the biggest aftermarket support and the best $/hp. Never been a fan of GM styling. Just personal preference. Now these LS motors have surpassed the Ford offerings so when people ask why a Chevy motor in a Ford I say I want to be quick as possible. Not quick for a Ford, just quick and I'll take the most value oriented path to get there every time.

Build specs so far:

In my possesion:

LQ4 (incl. harness, ecu and all accessories) w/ 100k
4L80E w/ 90k
FTI SRL converter w/ 3600 stall
AJE K-member, mounts and a-arms
Cobra brakes

To be sourced:

Camshaft - leaning to LJS
F-body or muscle car oil pan kit
PAC 1218 springs
LS9 gaskets
Tuner software
Walbro 400lph in-tank pump
80lb injectors
Turbos - http://www.ebay.com/itm/251453904780?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT
Not mine but the exact same colour and wheel/tire setup.




Car had some rust in the typical strut tower area. I cut out the bad stuff and had a guy tig weld it up for me.










Any constructive comments are more than welcome.

Martin Smallwood

iTrader: (2)

I have cammed a lot of 6.0's with the China and Ebay 76mm turbos with the small 68mm turbine.

I can tell you this, they do NOT like a lot of overlap and I normally run negative overlap with this combo. Back pressure is the enemy in a turbo application. With a small turbine wheel on a larger engine that's going to move some airflow, keeping back pressure at bay will result in higher power output.

Here is what I would do for the cam:

222/226 .586/.578 115+3

Schnitz

Thanks for the heads up. Much appreciated.

Those numbers seem to come close to the Crane 224 cam.

booboo37

iTrader: (43)

Muscle car pan will hang to low......you need ls1 f-body pan..

Schnitz

Thanks for the help. This is why I love forums.

Martin Smallwood

iTrader: (2)

I'd like to mention that all of my camshafts are ground on 8620 billet steel Cam Motion cores. The 8620 core is a much higher quality piece than a 5150 billet steel core like Comp or others use. All of my cams are also hand polished to ensure the smoothest surface finish possible. All of my cams are also cam doctored to ensure accuracy and the report is sent with the cam.

The little things like mentioned above are what separate a good part from a great part.

Schnitz

Good info.
I saw your previous post in mobile form so it didn't display your signature. Now it makes that much more sense.

Maybe I consider a .81 a/r to mitigate the back pressure issue....

Martin Smallwood

iTrader: (2)

Go with the biggest exhaust housing they have available.

With such a small turbine wheel, the larger housing will only help.

BOOSTAT4500

iTrader: (17)

What are your goals for the car? I ask because that's a lot of turbo for twins. I have a very similar setup except for an LQ9, and twin on3 70mm turos. They don't make positive pressure till about 4k rpm on the street. I am at high altitude though, so that's not helping.

I have a custom cam by Martin Smallwood and would highly recommend him.

F-body or cts-v pan is the only way to go.

Schnitz

I'm planning for about 600whp to start. I know it's never enough so that's a starting point for now.
After a conversation with Martin I'm now going with twin 66mm .81a/r turbos and one if his cams.

BOOSTAT4500

iTrader: (17)

Probably a good call. I'm seriously considering swapping to smaller turbos myself. I'd like some low end to go with the top end.

FrossB

iTrader: (1)

I am using the CTS V pan on my 5.3 93 Notch using the AJE K member. It sits damn near flush with the K member. Awesome clearance. Picked mine up new with gaskets, tray and pickup for like 200 bucks shipped.

Martin Smallwood

iTrader: (2)

I'm glad we got a chance to speak on the phone and you were able to set me straight that you were using twin turbos and not just a single turbo.

In your original post you never made actual mention of using twins, but I see now that you wrote "turbo(S)" and not "turbo" next to the link you posted of the turbos you're wanting to use. Total brain fart on my behalf! Hah!

You will be much happier with the twin 66's than the twin 76's and they will spool much quicker and be much more fun to drive!

Let me know if I can be of any more help to your build. I'd be glad to assist with anything that I can sir!

DavidBoren

What did the change from single to twins do to your cam recommendation? Is it still similar to the cam in post #2?

Schnitz

That's a bunch! We'll chat next week.

Schnitz

Thanks! Where did you find that deal?
Best I can find is $275 shipped.

Martin Smallwood

iTrader: (2)

Since there is more available airflow to the engine due to two turbochargers being used versus one, the engine can demand and move more airflow without "over running" the turbos by utilizing a slightly longer valve overlap event. Since the two turbochargers being used can effectively supply the engine with more airflow at all engine speeds(especially high RPM) the cam can also have a later IVC event and earlier EVO event. This will help the engine capitalize on the additional airflow available at higher engine speeds, thus making more power.

When you have a turbo that can only supply so much airflow, there is no point in going with a larger and larger cam with a longer overlap event, later IVC and earlier EVO. The turbo just can't support the airflow needed to make use of the larger camshaft at higher engine speeds. When a larger cam is used in a situation like this, back pressure also becomes an even greater issue. Since the compressor wheel cannot keep up with the airflow being demanded by the engine whether from a small turbine wheel/exhaust housing that won't allow any more additional shaft speed, or a compressor wheel that just can't flow anymore air, back pressure will usually increase.

If a turbo can only provide the engine with enough airflow for 6000rpm, putting a camshaft in the engine that would be better suited for 6500+ RPM isn't going to do the customer any favors. In fact he will lose out on average power and power that could of been made in the RPM range the turbo is effective in.

Steven32

This will be a great car! I originally wanted to go with twins, but decided doing a single instead.

My car is almost running. Not to try and thread jack, but maybe someone can chime in and guess a question for me...I'm trying to guess what kind of power I could potentially be making with my setup. Here are the specs...

LQ4 w/ LS2 rotating assembly.
4L80e with HD2 shift kit.
LS6 intake, 317 heads.
Comp cam 226/235 .605/.610 115+4 with .660 springs.
VSracing 78/75 78mm compressor 75mm turbine .96ar T4 single turbo.
dual 340lph fuel pumps, 80lb injectors. E85 fuel.

Thanks!

Martin Smallwood

iTrader: (2)

Steven32,

That combo should easily be good for 700rwhp IMO. If not a little bit more. I'm not that familiar with that turbo though, although I'm sure along the way I've had customers buy cams from me that utilized that specific turbo.

Steven32

Sweet! That would be awesome. I'm hoping to be in that range. I would guess my setup should take me into the 9's, goal is to hit 8's eventually.