1993 Mustang coupe - LQ4 4L80E 7875 turbo build
#1
1993 Mustang coupe - LQ4 4L80E 7875 turbo build
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.
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.
Last edited by Schnitz; 05-04-2016 at 06:37 AM.
#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
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
#6
The little things like mentioned above are what separate a good part from a great part.
#7
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....
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....
Last edited by Schnitz; 11-16-2015 at 04:46 PM.
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#9
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.
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.
#12
#13
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!
#15
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!
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!
#16
Best I can find is $275 shipped.
#17
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.
#18
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!
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!
Last edited by Steven32; 11-20-2015 at 08:04 PM.
#19
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.
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.
#20
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.