TPI SBC refresh with G6 6 speed trany upgrade (Page 11/16)
Raydar DEC 22, 10:04 AM

quote
Originally posted by 87GTZ34:
..."let's go... you're driving."...



That would pretty much do it for me.

Nice write up. I'm quite envious.

Congrats, Alex!

[This message has been edited by Raydar (edited 12-22-2006).]

Will DEC 22, 02:05 PM

quote
Originally posted by Marvin McInnis:


You obviously have never flown a single-engine airplane over open water or over mountainous terrain at night.

Reciprocating aircraft engines, in general, shake like crazy even when they're running "smoothly." A typical aircraft engine displacement is 90 cubic inches (1.5 liters) per cylinder, and most of the ancillary systems (induction, fuel, ignition, etc.) still represent the very best of 1930s technology! Added to that, operation over open water or over mountains at night is guaranteed to put the engine into "auto-rough" mode. Been there, done that!




I know what aircraft piston engines are like. The vast majority of my flight time has been in turboprops and jets. Pistons belong on the ground and helicopters stay next to it.
ICouldaBeenAV8 DEC 22, 09:17 PM

quote
Originally posted by Will:
I know what aircraft piston engines are like. The vast majority of my flight time has been in turboprops and jets. Pistons belong on the ground and helicopters stay next to it.



It also gives you a lot of sphincter traction on the seats.
exoticse DEC 23, 10:20 AM


Congratulations Alex !

I know the long and challenging process must feel well worth it now !

Sounds like it must be a beast now !

A smooth shifting beast !!
Alex4mula DEC 23, 07:29 PM
Thanks all I'm really having fun now but still there is a lot of tuning. I got it from scary lean to rich so now I need to find the sweet spot. It is just a time consuming data gathering, burn prom, trial and test until it is right. I'm reading O2, RPM, MAP & TPS. Car looks like it is hooked for an electrocardiogram! Also got my last kit item (Dakota converter) to get the speedo to work right. No speeding ticket risk now




[This message has been edited by Alex4mula (edited 12-23-2006).]

typhoon DEC 24, 03:00 PM
Just a note from someone who has been there done that. When you get your speedometer hooked up and the proper signal to the ECM, your stalling problems when you stop will be taken care of.

------------------
..from beautiful Caledonia, WI
87 GT 5 speed Electron Blue V8 SBC TPI
87 GT 5 speed med red (for sale)
94 BMW 850Ci V12 (for sale)
93 GMC Typhoon (for sale)
05 Caddy STS
00 Pontiac GTP with GTX package
96 Suburban
92 Dodge Shadow 28K miles

Alex4mula DEC 24, 06:55 PM

quote
Originally posted by typhoon:

Just a note from someone who has been there done that. When you get your speedometer hooked up and the proper signal to the ECM, your stalling problems when you stop will be taken care of.




It wasn't that. The TPI idle needed to be adjusted for the new cam. After I did that it went away even without the speedo working. I only got a code for the speedo after driving for more than 15 min. But then again that is solved. Thanks.
Alex4mula FEB 07, 03:42 PM
Tuning is everything. But very time consuming and risky around here. To get a good WOT AFR reading I need to rev in 3rd gear to 6000 RPM. That takes me close to 100mph on heavy patroled FL roads. Good thing is I'm having some progress. First reading below was the tune I had with the previous engine. Of course very lean with the added air flow from the heads/intake. Then for safety I added a lot of fuel to take out slowly. That's the pig rich second reading mainly in the 11s. I'm tuning for 12.8:1 and slowly taking fuel off and measuring. Third and fourth charts show that. The last one is almost there. Just need to fix that lean peak from 4000-5000. Once I get this ok I'll hit the dyno. But now first to fix that oil hose that I blew off....




Alex4mula MAR 21, 07:47 AM
Just to put an end to this I'll include dyno results with the new setup. Clutch still slips when cold but once hot it seems to pull ok. Last dyno it did 236hp/342tq and now 304hp/366tq both at the wheels (SAE). So that's a 68hp/24tq gain. Not bad for a TPI I think. I adjusted fuel and timing at the session but there were no major gains from initial (+6hp/+9tq). Next thing I may try would be bigger headers (1 5/8" or more) and CAI I'm very happy with it because it was what I was looking for. Below are the pics of old and new dynos and here are some video links of the pull







New dyno;


Old dyno;

[This message has been edited by Alex4mula (edited 09-12-2007).]

Alex4mula SEP 12, 01:22 PM
Well... the SPEC 6 speed clutch failed at exactly 2700 miles even. It started to shift harder and harder and now it is very difficult to get into 1st. It shift fine with the engine shut off. Also it was (and is) vibrating so something is not round anymore inside there The pedal feels perfect so it is not hydraulic. This hydraulic slave is a beauty. This clutch never grabbed well since the begining so I'll see if I can get something better to hold the massive torque. Will keep you posted.