North American Turbocoupe Organization



So har far are you guys pushing your luck?
Ryan H Offline
Posting Freak
#1
My current setup:

Knock sensor disconnected
764 coppers gapped at 0.30"
87 octane
Wastegate disconnected
Fuel pressure @ 39 PSI base
12* base timing
"premium" mode disabled unless I put in 93 ocatane

I nail 18 PSI almost every day, 19+ if I'm going uphill or really slamming the pedal.. No audible detonation, and I've been keeping tabs on the plugs. Gapping them @ 0.30" seemed to make all signs of running lean go away completely. Is anybody else getting away with this, or do I just have a magical Turbo Coupe? Big Grin
'88 TC Smile Walbro 255HP, Stinger FMIC, PIT BOV, Pro 5.0, Kirban, RR cam, FRPP strut tower brace, T3
Reply

Import Killer Offline
Senior Member
#2
18psi on 87 doesnt sound too good. I'm sure you'll be ok if you dont hear detonation, but I kept my knock sensor connected because I'd rather lose a few hp then have my motor blow up. I have never run less than 89 in my car and I haven't boosted more than 15psi.
1987 Turbocoupe
Painted sonic blue pearl
Ground effects w/S351 wing
17x9 Chrome Cobra Rs
255/45/ZR17 Kumho 712s
KYB suspension
MOMO shift knob and boot
K&N cone air filter, Gillis boost valve, T-3 turbo, ported intake and E6, A237 roller cam, MSD coil, Kirban FPR
Full 3" exhuast w/Ultra Flo muffler
Brute force clutch
White faced indiglo gauges
2 12" Rockford Fosgate subs and amp
Reply

svo_thunderchicken Offline
Senior Member
#3
import, sounds like you dont have fun with your car... hehe, your babying it...
84 TC Silver 5 speed - PE EEC, Big Vam, RR cam, 35lb injectors, E6 swap, T3 60 Trim, 87-88 intercooler and hood, BOV, K&N Cone Filter *under constrution*
http://www.cardomain.com/ride/2298891/1

87 TC Black 5 Speed - Stock IHI, BCS Bypassed
http://www.cardomain.com/ride/2390431
Reply

natmac3 Offline
Administrator
#4
What boost gauge are you using? Cuz if you're running the stock IHI without the wastegate connected I GUARANTEE it will overboost to 30+PSI within 1-2 seconds of WOT.

At that point you might as well be driving a diesel...

--n8
1987tc
Reply

Ryan H Offline
Posting Freak
#5
I know lots of guys that don't run a wastegate on the IHI and can't get more than 19 PSI out of it...
'88 TC Smile Walbro 255HP, Stinger FMIC, PIT BOV, Pro 5.0, Kirban, RR cam, FRPP strut tower brace, T3
Reply

natmac3 Offline
Administrator
#6
Are you not running a wastegate, or are you not running a Boost control valve...???
1987tc
Reply

Ryan H Offline
Posting Freak
#7
Wastegate is totally disconnected. I didn't have to do it before I swapped turbos, but I'm pretty sure the actuator spring is messed up. With the original turbo on the car and the factory BCS connected, it would go to 10 PSI below 4,000 RPM and 15 above 4,000 RPM, so I'm pretty sure the gauge is accurate. I did the bypass and got 17 PSI, and the turbo blew shortly after.

I put the new turbo on and could only get 5 PSI with the BCS connected and 11 with it bypassed on the same gauge. I disconnect the wastegate completely and the gauge will show full boost & boost comes on much quicker. I think the backpressure in the exhaust housing is pushing the flapper door open after 19 PSI because the spring is too weak to hold it closed.
'88 TC Smile Walbro 255HP, Stinger FMIC, PIT BOV, Pro 5.0, Kirban, RR cam, FRPP strut tower brace, T3
Reply

natmac3 Offline
Administrator
#8
That's crazy! I know mine will spin into OBLIVION without a reference line to the wastegate. All I can say is be careful...

--n8
1987tc
Reply

JohnL Offline
Senior Member
#9
Reeve had to put a spring on his wastegate to get 20 psi out of the IHI...so it makes sense, but still scary. Why don't you add a spring onto the flapper arm, and then hook the wastegate back up with a boost controller, would be much safer.
John Lewis
88 TC, 87 XR, 84 SVO
Currently deciding which is worth my time.
Reply





Users browsing this thread:
1 Guest(s)



Theme © iAndrew 2018 - Software MyBB