askulte

During summer vacation, I decided to head down to Jeff Creech's Carolina Auto Masters (.com) dyno for some tuning. With the wastegates disconnected, got 536.9rwhp/590tq at 3800 rpms before the spark got blown out (need to upgrade the ignition now). Boost set at 5 psi, got 414/450.4, and set at 10 psi got 447.6/536.7. I didn't have a chance to disconnect the SLP catback, which I think is becoming a big restriction at the higher boost levels, but I did pick up a flat NASCAR side exit exhaust from Muscle Motorparts. That will be fabbed in a few months, and I'll get some new numbers once all the little quirks are solved. Anyways, it's good to have it running!

89gta383

iTrader: (5)

:hail:

slickrock55

Great numbers, Andris!!

What ignition are you using that is getting blown out, and what boost level did it happen at (if you know)?

THEGENERAL

WOW that is awsome do you have any pics of it ?????? would love to see some

askulte

Thanks! Ignition is the lovely stock HEI w/ an Accel coil, he he he. I have a 300+ wired up, but it was not connected due to electrical interference issues, sharing the same connector as the rest of the sensors (have to re-wire it with a dedicated connector through the firewall). I needed to make sure fuel was sufficient on the dyno, so now I can go street tuning to get the full boost figured out. The fuel pressure (Walbro GSS307 intank pump) started dropping from 60 down to 50 psi but the injectors had enough to compensate for it. Boost hit 17 psi on the max run before I ran out of spark. Gap was set at .035. The ignition seemed to handle 10 psi, however. I need to update the website, but pictures can be found somewhere on www.skulte.com/turbo.html, in the logbook section.

Andris

sleepybu

got a pic

askulte

Similar to this:


Basically flat tubing for ground clearance, and the side exit is about 1.5"x8". I've got a few of the Dr Gas x-overs which probably won't do anything in a turbo application, so they may just get patched back shut and used as nice flat bends.

83 Crossfire TA

iTrader: (2)

you know, I found that the Accel coil works great with the 300+ box, but not so well on it’s own. I’ve tried it on 3 different cars now, and the car runs better with the stock coil then with the Accel coil without the box connecte, but with it connected I can’t tell which coil is in it.

The more I tinker with this stuff the more I believe that lower fuel pressures and bigger injectors are the way to go. It’s amazing how little a fuel system you can get away with if you’re running base fuel pressures in the 35psi range, and everything ends up being more reliable

94-6spd

Great numbers Andris. I saw your car at Indy. Did you ever get your alternator fixed? I was the guy that let you use my batt. charger. I was also the guy that had the white 3rd gen on the trailer working on it the whole time. LOL. I've got it lined out now though. Your turbo setup is very cool and I took numerous pictures of it. Preston

askulte

Preston - Thanks (and also for letting me borrow the batt charger at Indy!). The alternator needs 12V on the brown wire w/ white stripe to excite the field and start charging, so we just jumped that right to the main alt terminal (direct connection to the battery), and all was good. Nothing like working on the car at events, right?!!

MMP - Why would a coil not work so well w/ the stock setup? Maybe it doesn't step up the voltage as much (i.e. the stock HEI module might charge it at 50V, while aftermarket Accel/MSD may charge it at 500V?). In any case, I'll wire up the 300+, and probably mount it in the engine bay this time to eliminate the EMF interference it caused sharing the main wiring harness inside the car.

The fuel system is still a Walbro 255 lph pump, stock feed & return lines, and then a -10 to a Y-block, and -8's to the rails, -6's to the fpr, and a -6 back to the stock return line. Injectors are low impedence w/ the Acceleronics injector driver box, and probably in the 60 lb/hr range.

83 Crossfire TA

iTrader: (2)

Well, exactly, sort of. I’m betting that Accel designed their coil so that it was optimized for the output of the accel box, which does not match (is much greater then) the output of the stock module. I never realized what a difference there was in coils until I tinkered with a HV power supply in my experimenting with arc starters for my home built tig. At one point I had a small circuit running, wall outlet, scr (light dimmer switch works well, anything that chops up the input from a power source), a motor start capacitor and an ignition coil… You’d be very surprised at what you find, and HP coils do not result in the biggest spark. Actually, what I found made the biggest, angriest sparks was an old oil filled coil oem coil out of a ’66 Dodge Dart:

(heh, this is right before that spark started climbing the side of the spark plug, up the insulator, shot through the box it was sitting on and set it on fire)

85maroz28

Congrats my man! :hail: