Fox My 90' Turbo Foxbody Build

  • Sponsors(?)


Lawless90

Member
May 15, 2017
48
14
18
25
What do you guys think would cause this issue...
Cold start fires fine, hot start, ive gotta hold it WOT like I'm clearing a flood. Once it fires it blows a poof of black straight up then it's a nice clear haze.(remember, I have a hood exit so I can see into the exhaust).

Does that sound like I should turn down the pulse width at startup vs what my ECT sensor says?
 

Lawless90

Member
May 15, 2017
48
14
18
25
Yeah, ill just bypass it tomorrow,
I also had a rubber elbow on my cold side collapsing every time I hit the throttle. I should've videoed that thing.
And is it common for air to whistle pretty loudly by the throttle blade?
What do you think about VR1 20-50 non synthetic?
 

Lawless90

Member
May 15, 2017
48
14
18
25
@a91what
So I'm at an end for the day, afrs still need work higher in the load range, but she cruises fine, idles good. And shoots flames out of the hood ;)
I may leave it as is until I get it dyno tuned.
I think I need to change plug wires though, I'm having a slight stumble around 3-3.5k rpm.
Has new plugs, and a good distributor, and screamin demon coil. I'll do wires tomorrow sometime.

How is the weather where you are?
One minute is sunny next it's piss pouring cats and dogs, then back to hot and humid. All day for the past 4 days.
 

Lawless90

Member
May 15, 2017
48
14
18
25
About an hour north of Nashville in Ft campbell, KY.

Even as hot as it is, when I was driving around street tuning, over a 50 mile span, it never went over 200. I'm also running a 192* thermostat. Also running VR1 20-50 since it's so hot out. I think it helps, but I really want to get a oil cooler with a thermostat to really be able to control all the fluid temps.
 

Lawless90

Member
May 15, 2017
48
14
18
25
Also do you know own anything about making a trans cooler for manual?

I won't own a car that won't make it on a 1000 mile one way trip, so I like to keep everything in check.
 

Lawless90

Member
May 15, 2017
48
14
18
25
Alright.
What's you plug of choice also?
I had clean platinums in mine and it ran like poo, switched back to Motorcraft copper plugs and good to go.
 

Lawless90

Member
May 15, 2017
48
14
18
25
Copper plug gapped at 30 depends on the heads but I like 2 steps colder than stock. Above 10psi

Would you mind posting some good timing tables that might be useful for me?
I drove the car 60 miles to get tuned, but the tuner said he wasn't comfortable tuning using the pro-m system because he has never seen/used it.

I've been doing some light street tuning and the car runs awesome for the most part, 14.2-14.7 at idle, and 14.7-15.3 at cruse and under light load. (A few long steep grades helped dial fuel in tighter.)

but I think my timing table could be improved. Around 3-3.5k I still have a little stumble but once I pass the hicup at WOT, it hunkers down and pulls hard.

I also think you were right that, a little more timing would help out at cruise I think, might make it a little snappier.
 

a91what

SendMeUrDataLog
Mod Dude
Apr 6, 2011
10,043
5,955
204
31
Hillsborough county
My tables may not make any sense to you, I tune mainly speed density.

I will say that in light load conditions 30-40* would not be out of the question. In deceleration I run a lot of timing.

Keep timing transitions nice and smooth is very important, especially going into wot.
 
Last edited:

Lawless90

Member
May 15, 2017
48
14
18
25
My tables may not make any sense to you, I tune mainly speed density.

I will say that in light load conditions 30-40* would not be out of the question. In deceleration I run a lot of timing.

Keep timing transitions nice and smooth is very important, especially going into wot.

Alright, I'll write another table tomorrow and post it to get your input on it.

Hopefully I can manage to tune this thing myself, I just don't want to grenade this one
 
Thread starter Similar threads Forum Replies Date
8 Engine Turbo fox build hot start issue Fox 5.0 Mustang Tech 7
M Engine Foxbody Turbo Build Fox 5.0 Mustang Tech 13
M Turbo Foxbody bin files (Starting point) DUMB YOUR BIN FILES HERE NO MATTER MODS!!!!!!! Digital Self-tuning Forum 0
C 1984 Mustang Turbo 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 0
M I have a 85 Foxbody I am getting a 427w roller and I don't know what would be better Supercharger or Turbo? 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 8
wgreenlee4 Did Anyone Forget These Existed? Foxbody Dark Era 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 4
K 84 Foxbody Single Turbo Opinions Fox 5.0 Mustang Tech 2
V8_Kind_Of_Guy Expired Mustang Foxbody 302/351w Turbo Kit - Makes 500+ Rwhp Engine and Power Adder 0
L Are sn95 5.0's compatible with some foxbody s/c or turbo kits? 1994 - 1995 Specific Tech 2
8 Foxbody turbo kit Engine and Power Adder 6
P complete turbo kit fs foxbody Engine and Power Adder 1
86turbo foxbody turbo kit feeler Engine and Power Adder 5
R For Sale 2000 Mustang Turbo 6 speed SN95 Mustangs For Sale (1994-04) 0
S What's it Worth? 2007 GT Premium Modified What is it Worth?!?!? 1
92j3ieje8 Could a turbo of a small audi be plausible on a 3.8 v6 mustang? 1996 - 2004 SN95 Mustang -General/Talk- 2
J Turbo hook up, wastegate, manual controller, etc Other Auto Tech 1
F LS Swap New Edge Saleen S-281 1996 - 2004 SN95 Mustang -General/Talk- 5
paddyrk Fuel E85 conversion necessities Fox 5.0 Mustang Tech 7
T WTB/Trade Fox body turbo kit Engine and Power Adder 0
X 2.3L Turbo w/c3 auto to t5 tranny swap 2.3L (N/A & Turbo) Tech 4
Jtoepper93 Turbo fox microsquirt help Digital Self-tuning Forum 16
C For Sale Garrett twin turbo kit + injectors Engine and Power Adder 1
M 1985 Gt EFI/Turbo Help Fox 5.0 Mustang Tech 2
T Help with 2v turbo build 1996 - 2004 SN95 Mustang -General/Talk- 3
R Stock crank limit numbers? 1996 - 2004 SN95 Mustang -General/Talk- 11
G Want to turbo my V6 2001 mustang 1996 - 2004 SN95 Mustang -General/Talk- 8
Nightstang00 Engine On3 turbo Air Filter Fox 5.0 Mustang Tech 1
R Carburetor for 93 2.3L non turbo 2.3L (N/A & Turbo) Tech 8
I (Guidance needed) i4 turbo fox build 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 20
C For Sale 1988 Turbocharged 5.0, $6,400, Wichita Falls, TX area Fox Body Mustangs For Sale (1979-93) 2
D 1984 MUSTANG 2.3L TURBO. 2.3L (N/A & Turbo) Tech 2
G Fox Supercharge, turbo or A/C? 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 7
6 2.3l non turbo engine wiring 2.3L (N/A & Turbo) Tech 0
8 355 Stroker motor, Nitrous or turbo? 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 3
G For Sale 99 Mustang Gt w/On3 Performance 68mm BB turbo SN95 Mustangs For Sale (1994-04) 0
C Engine Turbo 306 Running Hot Fox 5.0 Mustang Tech 16
C Forced Induction Stock cam vs turbo cam? 1994 - 1995 Specific Tech 4
metal mike What's it Worth? 1996 mustang twin turbo What is it Worth?!?!? 3
metal mike 1996 mustang twin turbo 1996 - 2004 SN95 Mustang -General/Talk- 1
onebad95 For Sale 2005 Mustang GT Helion Turbo Kit Engine and Power Adder 1
Schnelly What next? 2008 GT Project 2005 - 2014 S-197 Mustang -General/Talk- 23
C New turbo slower times 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 40
KZGUNS Fox Help me decide turbo or supercharger 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 28
Nightstang00 Engine Alternator Bracket / Water Pump Fox 5.0 Mustang Tech 6
M Turbo hotside question 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 3
3 For Sale Pro Turbo Kits SN95 turbo kit Engine and Power Adder Parts 1
M New guy here! turbo megasquirt The Welcome Wagon 1
lunetick Help with my 89 302 turbo tune Digital Self-tuning Forum 10
B 347 stroker turbo size? 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 45
Fox5-0 For Sale HKS Bypass Valve Engine and Power Adder 0
Similar threads