Ok so I hooked up my fuel pressure gauge and I read 41 psi key on and held 41 psi on idle I rev it and it jumps to 46. Unhooked vacuum and it reads 46. So I'm assuming my pump is fine.

Now with the injectors. I'm not exactly sure how to use an ohm meter. But I set it at 2000ohms and tested out each injector and everyone read 12.

Did I test the fuel injectors wrong?

 

So I went and dynoed the car today. My rear wheel horsepower is 265 and my torque is 300. With the cutout open.

They were telling me that stock LT1's only run 190 HP to the rear wheels and they think that my Car is cammed and tuned somehow because they took it up to 6,200 rpm.

ummmm...... I thought the engine was stock, but I guess the previous owner might have done something. Anyway I can tell? Could it be possible that my car only does the hesitation in lower RPMs because of a possible different cam?

 

Let's break this down logically.

My 94 camaro with the mods in my sig ran a best of 8.957 @ 80.58 MPH in the 1/8th, and 13.772 @ 102.01 MPH in the 1/4th, both around 850ft altitude, or 2000ft DA.

If everyone is saying your car is low on power due to a bad 1/8th time, but yet "the guys" at the dyno shop say your car is cammed? I don't think so. Your car is stock, and the people at the dyno place are speaking incorrectly.

As for a next mod, a transmission cooler because your transmission will be toast with a 3600 stall in a lot less time than with a stock one. Bigger cooler the better.

 

Not necessarily the correct assumnption. The fuel pump may affect the engine at high engine load/max RPM. That's when it may not be able to supply enough fuel. You tape the fuel pressure gauge to the windshield, take it out on the highway, and watch the fuel pressure as you take up to max RPM at WOT. If the fuel pump can not supply enough fuel, the pressure will start to drop as the engine load builds up.

You need to make several checks. The first is to make sure there is 12V at the pink wire in each injector harness connector. There should always be 12V there - the PCM supplies a ground to fire the injectors. Next step is to check the injector resistance, as you did - should all be between 12-15ohms. Now you need to verify that the PCM is supplying the ground. You put a 'noid light on the injector connector to make sure its flashing.

But even simpler is to scan it for codes. If there is a fault in the injector circuits - no volts, wrong ohms or no ground, the PCM sets a code. Have you had it scanned?

At this point, you've just proved the injectors are operating. Now the issue is are they flowing correctly? If they are dirty they may not flow enough fuel, or they may have a bad spray pattern. IF they are lekaing, they will throw the A/F ratio off as well.

 

A stock LT1 with an A4 trans should pull 225-235rwHP. Not sure where they may have dreamed up the 190rwHP number.

The stock rev limiter is set at 5,800RPM. If they were using a pickup on the dyno, their measurement would indicate the rev limiter has been raised. If they were watching the stock tach in the car, it typically reads 200RPM above actual engine speed.

 

The car already has a transmission cooler on it. And ill make a run with the pressure gauge taped to my windshield. I'll go out and try to find that pink wire and see if it's getting power at all times.

I have not had it scanned yet. I don't really want to go to the dealer because they charge $80 just to hook it up.

I'm going out to the track again march 8th so I'll get you all another track time. Sadly my converter won't be shipped out till march 6th.

What do y'all think about those numbers though. Those are to the wheel. They seem about right? 265 rwhp and 300 rear wheel torque.

Yes 190 what they said stock seems low. Maybe there dyno is retarded.

Video http://www.youtube.com/watch?v=gKPSF...e_gdata_player

 

Its not just one pink wire. There is a pink wire in each of the 8 injector harness connectors.

 

here's the dyno sheet

 

So each injector has a pink wire that gets 12volts constantly?

 

Yes. There is a pink wire, and a black wire with a colored stripe in each injector connector. Only the stripe varies to identify which cylinder it connects to. The harness connectors have numbers on them to indicate which injector they connect to.

 

You dyno sheet indicates the A/F ratio in the typical 12.8-13.2:1 range that typically produces good torque/HP. That would indicate the PCM has been tuned, because the stock LT1 programming has an overly rich target A/F ratio in power enrichment mode of about 11.7:1. There is some evidence it's lenaing out slightly as it approaches 6,000RPM, but that's not bad. It would indicate you probably are not having fuel problems.

Your rwHP is consistant with a near stock(CAI, headers) LT1 through an A4, with a PCM tune.

 

Gonna go test fuel pressure on highway. And check
O'reilly to see if they can scan it

 

I would expect your numbers to be between 15-20hp higher, I have a 96 a4 (stock stall) with intake and long tube true dual set up with a pcm4less tune that put down 293hp and 316tq. Before my auto I had a bolt on M6 LT1 with similar mods that put down 302rwhp and 330tq. given you have mids i would think something in the 280hp range. Something is off and it may be related to your ideling issue. Your on the right track and you have some of the best people helping you out in this thread, good luck to you!

 

Ok guys. I went and tested
The fuel pressure while driving at WOT. as the RPM goes up the fuel pressure goes down to like 31. When it shifts it bumps back to 41 and goes back down as the RPMS go up. I recorded it and will upload it to YouTube for you all.

 

Fuel pressure at WOT

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