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Search: Posts Made By: ULTM8Z
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Forum: Tech / General Engine
04-09-2024, 10:24 PM
Replies: 3
Views: 148
Posted By ULTM8Z

Re: Brass distributor gear

Just get a gear from Rock Auto for a 88-91 Corvette. Melonized and meant for even a billlet steel roller.
Forum: Electronics
04-07-2024, 10:57 AM
Replies: 23
Views: 737
Posted By ULTM8Z

Re: Need some alternator clarification

Can also look into an AD244 LS alternator swap if you have a serpentine setup. It's been documented on this site and I've also personally done it on mine.

At which point you can run a factory 140...
Forum: DIY PROM
03-30-2024, 08:37 PM
Replies: 26
Views: 787
Posted By ULTM8Z

Re: Miniram ~10% bigger injectors on cyl's 1-4

Oh yeah... "do away with the dizzy"... I remember that thread.

In reality, my HEI setup is just fine. I have the large cap distributor with a Petronix ignition module as well as an MSD external...
Forum: DIY PROM
03-30-2024, 08:35 PM
Replies: 26
Views: 787
Posted By ULTM8Z

Re: Miniram ~10% bigger injectors on cyl's 1-4

Ah, the infamous MAT Compensation Counts table...

Actually matter of fact I'm running the $DA3 MAT compensation table as well given I have the MAT sensor relocated to the air duct (like the 4th...
Forum: DIY PROM
03-30-2024, 08:05 PM
Replies: 26
Views: 787
Posted By ULTM8Z

Re: Miniram ~10% bigger injectors on cyl's 1-4

Mind elaborating on this? I'm not sure I've ever heard that before.

Also, where can I get more info on the Northstar coil packs?[/color]
Forum: DIY PROM
03-30-2024, 10:19 AM
Replies: 26
Views: 787
Posted By ULTM8Z

Re: Miniram ~10% bigger injectors on cyl's 1-4

No emissions here for cars earlier than 1975. Car is a 1971 Camaro.

A long time ago, I had considered and researched converting to a 4th LT1 SEFI system, as I had heard about people retrofitting...
Forum: DIY PROM
03-29-2024, 03:49 PM
Replies: 6
Views: 288
Posted By ULTM8Z

Re: Best Wideband for tunning with $8D What are you guys using today

Been running an AEM for the last 10 years or so.
Forum: Electronics
03-24-2024, 06:57 PM
Replies: 8
Views: 302
Posted By ULTM8Z

Re: What is the best way to add multiple ignition sources

I have something like this powered by a direct connection to the battery that is switched on and off by a relay. The relay is controlled by a 12V switched ignition source.
...
Forum: TPI
03-23-2024, 09:11 AM
Replies: 3
Views: 249
Posted By ULTM8Z

Re: 1989 350 TPI surging issue: stumped

that's a huge clue.

stock you should be up around 18 inHg I believe.

Sounda like you might have some sort of intermittent MAF problem.
Forum: Tech / General Engine
03-22-2024, 06:28 AM
Replies: 1
Views: 163
Posted By ULTM8Z

Re: Distributor help

The tabs need to go towards the distributor housing
Forum: DIY PROM
03-21-2024, 03:28 PM
Replies: 8
Views: 280
Posted By ULTM8Z

Re: CobraRTP MotronicRT R6?

Not sure about the differences. You'd have to call them.

I ran a Romulator years ago on my 7730 before the ostrich came out and it worked pretty good.
Forum: DIY PROM
03-20-2024, 07:37 PM
Replies: 8
Views: 280
Posted By ULTM8Z

Re: CobraRTP MotronicRT R6?

What about Transtronics Pocket Romulator?

https://secure.transtronics.com/EPROM%20Emulator.html
Forum: DIY PROM
03-19-2024, 08:47 PM
Replies: 39
Views: 629
Posted By ULTM8Z

Re: New Build Lean O2 / Low BLM's

Great news!
Forum: DIY PROM
03-19-2024, 01:15 PM
Replies: 39
Views: 629
Posted By ULTM8Z

Re: New Build Lean O2 / Low BLM's

That's a shame. From what I kept hearing it was a really good product.

Might want to post a WTB in the classifieds here and Corvette forum. Occasionally I see people selling them.

That said, 8D...
Forum: DIY PROM
03-16-2024, 11:31 AM
Replies: 18
Views: 292
Posted By ULTM8Z

Re: 1991 axcn info needed

Lol... that is weird. PM me your email and ill dig it up an send to you in a little bit.
Forum: DIY PROM
03-16-2024, 08:47 AM
Replies: 18
Views: 292
Posted By ULTM8Z

Re: 1991 axcn info needed

Did you check the link in post #2?
Forum: DIY PROM
03-15-2024, 10:10 PM
Replies: 18
Views: 292
Posted By ULTM8Z

Re: 1991 axcn info needed

I understood the same thing. Efficient chambers dont need as much timing.
Forum: DIY PROM
03-15-2024, 04:20 PM
Replies: 18
Views: 292
Posted By ULTM8Z

Re: 1991 axcn info needed

Holy smoke... the 89's had a TON of spark timing...


https://cimg1.ibsrv.net/gimg/www.thirdgen.org-vbulletin/850x406/axcn_vs_apyp_spark_timing_d3a1f91a2a8499f6e91e30ba2a0d80d186c83547.png
Forum: DIY PROM
03-15-2024, 03:29 PM
Replies: 18
Views: 292
Posted By ULTM8Z

Re: 1991 axcn info needed

I think the OP was referring to earlier year Corvettes (85-59) vs the 90-91.... not Vettes vs Camaros.
Forum: DIY PROM
03-14-2024, 03:00 PM
Replies: 39
Views: 629
Posted By ULTM8Z

Re: New Build Lean O2 / Low BLM's

I'm pretty decent with the 8D stuff, and particularly familiar with tuning for short runner manifolds due to my Miniram experience... if you get your WB hooked up to send data to the ECM (which...
Forum: DIY PROM
03-14-2024, 11:23 AM
Replies: 39
Views: 629
Posted By ULTM8Z

Re: New Build Lean O2 / Low BLM's

In the meantime you really need to get the voltage offsets from Trickflow for your injectors. If they're far enough off from the original GM values, it can wreak havoc with your tuning (I've...
Forum: DIY PROM
03-13-2024, 06:17 PM
Replies: 39
Views: 629
Posted By ULTM8Z

Re: New Build Lean O2 / Low BLM's

BLM is down to 120. That's not horrible... does it continue to go down or bottom out at 120?

You might be getting into the split BLM phenomenon that's also common to short runner manifolds and...
Forum: DIY PROM
03-12-2024, 05:27 PM
Replies: 39
Views: 629
Posted By ULTM8Z

Re: New Build Lean O2 / Low BLM's

It's actually two tables...

If you're running the plain old 8d.xdf from Tunerpro.net, look for these.

Injector Pulse Width Correction Vs. Battery Voltage => This is what you need from...
Forum: DIY PROM
03-11-2024, 09:29 PM
Replies: 39
Views: 629
Posted By ULTM8Z

Re: New Build Lean O2 / Low BLM's

Get a hold of Trick Flow and ask for the voltage offsets.

Also your bin still shows 22 lb/hr, so you'll need to update to 24.

Lastly, you'll probably want to zero out the Low PW compensation...
Forum: DIY PROM
03-11-2024, 09:27 PM
Replies: 39
Views: 629
Posted By ULTM8Z

Re: New Build Lean O2 / Low BLM's

Popping back through the intake (which I'm assuming you mean by "backfire") is typically due to a lean condition.

With the Pro-Flow manifold you're probably into the short-runner large plenum,...
Forum: DIY PROM
03-11-2024, 08:40 PM
Replies: 39
Views: 629
Posted By ULTM8Z

Re: New Build Lean O2 / Low BLM's

Looks like the bin opens up in $8D.

What manufacturer and p/n injectors are you running? Your voltage offsets are the stock values, so you may need to change them.

Also since you relocated your...
Forum: DIY PROM
03-11-2024, 06:31 PM
Replies: 39
Views: 629
Posted By ULTM8Z

Re: New Build Lean O2 / Low BLM's

Are your NB and WB sensors on the same side of the engine?
Forum: DIY PROM
03-05-2024, 08:20 AM
Replies: 26
Views: 787
Posted By ULTM8Z

Re: Miniram ~10% bigger injectors on cyl's 1-4

A long while ago I was playing with the idea of going to some form of SEFI, but it never really gained much steam.

I had solved the notorious idle split-BLM issue with this contraption about 17...
Forum: DIY PROM
03-05-2024, 08:15 AM
Replies: 26
Views: 787
Posted By ULTM8Z

Re: Miniram ~10% bigger injectors on cyl's 1-4

Yes, the front half. In the $EE code when they went to SEFI on the 4th gen LT1's, on some of the applications they biased the front 4 cylinders ~10% richer all the way up to 40% throttle. ...
Forum: TPI
02-26-2024, 05:46 PM
Replies: 11
Views: 332
Posted By ULTM8Z

Re: Strange fuel trim issue

I'm running Crower's 00482LM. Pretty mild for a 383, but I wanted a very mild mannered car.

https://crower.com/camshafts/chevy/small-block-sbc/chevrolet-hydraulic-roller-camshaft-64.html

Also...
Forum: TPI
02-26-2024, 05:08 PM
Replies: 11
Views: 332
Posted By ULTM8Z

Re: Strange fuel trim issue

It has everything to do with it... lol
Forum: TPI
02-26-2024, 05:05 PM
Replies: 11
Views: 332
Posted By ULTM8Z

Re: Strange fuel trim issue

Yep....

https://www.thirdgen.org/forums/diy-prom/787204-miniram-10-bigger-injectors.html
...
Forum: TPI
02-26-2024, 04:33 PM
Replies: 11
Views: 332
Posted By ULTM8Z

Re: Strange fuel trim issue

I have the factory narrow band that communicates with the ECM. But I have a wide band that I added for monitoring the air fuel ratio. The wide band is not used by the ECM.

In retrospect, I...
Forum: DIY PROM
02-26-2024, 02:00 PM
Replies: 4
Views: 246
Posted By ULTM8Z

Re: Strange BLM issue

Just to close this out in case this redundant thread doesn't get deleted... I think I found the issue.

https://www.thirdgen.org/forums/tpi/787967-strange-fuel-trim-issue.html
Forum: TPI
02-26-2024, 01:59 PM
Replies: 11
Views: 332
Posted By ULTM8Z

Re: Strange fuel trim issue

Figured it out (I hope)....

Some sort of copy and paste error I think during a past bin update.

I back tracked all my O2 swing points, prop gains, lag filters, etc... constants and tables...
Forum: TPI
02-26-2024, 09:20 AM
Replies: 11
Views: 332
Posted By ULTM8Z

Re: Strange fuel trim issue

Update...I swapped the WB and NB O2's to the opposite sides of the engine (NB was on the driver side).

With the NB on the passenger side and a couple of runs.... it's now doing the high BLM more...
Forum: TPI
02-26-2024, 09:08 AM
Replies: 11
Views: 332
Posted By ULTM8Z

Strange fuel trim issue

I had posted this in the DIY PROM section, but it may not be a calibration issue, so I"m putting it here. Admins feel free to delete the one in the DIY PROM section... Also some subsequent posts...
Forum: DIY PROM
02-25-2024, 07:41 PM
Replies: 4
Views: 246
Posted By ULTM8Z

Re: Strange BLM issue

I just swapped the WB and NB O2's to the opposite sides of the engine (NB was on the driver side). Tomorrow I'll drive the car into work and see what happens.

This will rule out a possible bad...
Forum: DIY PROM
02-25-2024, 07:09 PM
Replies: 4
Views: 246
Posted By ULTM8Z

Re: Strange BLM issue

Yeah those look rock solid too.
Forum: DIY PROM
02-25-2024, 06:08 PM
Replies: 4
Views: 246
Posted By ULTM8Z

Strange BLM issue

So I'm not sure if I did something to cause this and not sure how far back in time this has been occurring.... but I was datalogging and noticed that after about a half hour of driving, the BLMs...
Forum: DFI and ECM
02-24-2024, 11:14 AM
Replies: 2
Views: 201
Posted By ULTM8Z

Re: Getting a chip

Agreed. I'd only go with a tuner who is able to look at running data and then adjust per that. Tuning blind is often very difficult and can get frustrating for both the tuner and the customer.
Forum: Tech / General Engine
02-24-2024, 09:24 AM
Replies: 10
Views: 363
Posted By ULTM8Z

Re: Stock l98 tpi cam upgrade zz4 or tpis

If you want it to sound stock and pass emissions I'd probably stick with the ZZ4 cam.
Forum: Tech / General Engine
02-24-2024, 07:33 AM
Replies: 10
Views: 363
Posted By ULTM8Z

Re: Stock l98 tpi cam upgrade zz4 or tpis

What are your goals for the car?
Forum: DIY PROM
02-21-2024, 09:32 PM
Replies: 13
Views: 563
Posted By ULTM8Z

Re: Tunerpro emulation doing some wierd stuff

Basically if I start the car with a bin loaded from Tunercat, I can then switch the emulation to Tunerpro and it works just fine.
Forum: Cooling
02-20-2024, 06:37 PM
Replies: 6
Views: 235
Posted By ULTM8Z

Re: Changing Coolant Temp Sensor

I suspect you meant burp. Lol....
Forum: TPI
02-15-2024, 09:35 PM
Replies: 24
Views: 509
Posted By ULTM8Z

Re: Knock count questions

IIRC, the knock counts never go down. It'll just keep going up until it reaches 256 or something like that, and then it'll go back to zero and start over.
Forum: TPI
02-15-2024, 05:57 PM
Replies: 24
Views: 509
Posted By ULTM8Z

Re: Knock count questions

I was battling something similar and ended up tracing it to excessive torque and/or bad knock sensor. On a modified engine where noises can come from things like headers, roller rockers, etc......
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