Gmwctech

This is my first post so here it goes. I have an 87 GTA with a 350 that I purchased at a consignment dealer so I never got to speak to the actual owner to find out what lurks within the engine. On the outside it has headers 3 inch exhaust and is emissions delete with the stock tune port manifold assembly and oe 22 lb injectors with an afpr. In fact the engine has been replaced and I'm not certain that it is even a factory replacement L98, or some other random crate engine with iron heads. The car is a bit quicker than a manual equipped LT1 4th gen. The previous owner swapped out the 700R4 for a T56 and converted it from MAF to speed density and has replaced the ECM with a 7730 out of a 90-92 F body. It has a Hypertech memcal that obviously has a custom calibration because the car is not equipped with Vats and it is fully emissions delete as I said before. It seems to have a slightly larger than stock cam in it and I was just curious aside from pulling the intake and using a degree wheel and a dial indicator on the lifters to try and determine duration and lift if there was a way to read the prom to see what specs were entered into it for the camshaft? I suspect it is not a stock cam because it has a mild Lope and I can easily run this thing up to about 5400 before it starts to nose over and run out of breath. I also have a 383 that I am putting together for it and was wondering where the best place would be to get a custom prom burned? I would obviously rather have it tuned on the dyno but the only ones I know in town don't deal with old school chips just the flash eeprom stuff of the modern day. Seeing as I don't think I'll have the 383 together for it this summer I was thinking about pilfering the trick flow 23-degree heads and the SLP runners plenum and bass that I have that are all fully ported to throw on top of this. If I do that then I can go through the process of finding out the duration and lift but I was still very curious as to what was entered into the chip for specs. If anyone has any input on this I would be immensely appreciative. Also just wanted to say this site is absolutely awesome and I have learned more by reading threads and posts on this site than anything else out there. It is truly astounding the wealth of information there is here.

battman

iTrader: (2)

Cam specs cannot be derived from the calibration..

battman

iTrader: (2)

oh, And welcome to TGO!

Gmwctech

Correct me if I am wrong but I thought when you got a mail order prom they wanted you to enter cam duration along with rear gear, compression and what not on the card.

Gmwctech

Nevermind I understand they simply use that to map the fuel and Spark and it's not actually a nerd as a data entry on the chip. Thank you very much for the quick response!

MrWillys

This post will most likely be deleted. You give this forum way to much credit. As i see it, it is 80% BS and Ego with 20% of real information. Cam specs of your engine can tuned but are only a portion of the issue that you currently face. I've always been a fan and say that all custom built speed density combinations should be datalogged and tuned. I built this page to aid in tuning exactly what you've questioned.
http://scotthansen.net/data2.html
Good luck on your quest to fine tune your vehicle. Scott

ULTM8Z

This could very well be the understatement of the century. As picky as I am, I've been at it for years... aside from dealing with gremlins every now and then, everytime I learn something new, I HAVE to try it on the car to see what it does. It's the reason my ECM has been laying on the passenger footwell for longer than I can remember...

Though hopefully I'll be able to call it good soon and stop the never ending cycle!

Fast355

iTrader: (2)

Yep!! My Moates Autoprom was a permanant fixture in the wall next to the seat in my old G-van. Hooked up to the 7730 and the 2nd ALDL port I put next to the ECM. I literally had a USB cable sticking out from under and could tie into it and make any realtime change at will. Really helped dial in the 232/240 @ .050, 110° LSA roller cam it had in the Vortec 383 TPI. I actually only pulled it out when I went to a 0411 OBD2 setup.

Dominic Sorresso

Yep, same here the 84 Xfire I had running EBL. Now its the LT5 w either the Ostrich or a flash prom in it. There's ALWAYS SOMETHING. ����